June 25, D. HEYER 2,205,975 VENTILATED WARIABLE. SPEED POWER UNIT. rose asses es 2 2 %2N S62 23 NSN. e %&rar s. is ed.

Transcription

1 June 2, 19. D. HEYER 2,,97 VENTILATED WARIABLE. SPEED PWER UNIT Filed Feb. 19, 1934 Sheet-Sheet Z2 roe ae e 2 2 %2N S62 23 EE 2 YS33. E II Sy - E-43 AY 2 al NSNS 2 X Yw e %&rar EI, g3 er NSN S243.%; 2126 É A. e Re32 at 2. w Ninee 3%zz.62 SNS tre Se: T7.2%% 76. \ 2x22zig 3. SSS ao 9 22 o 2% % i ed S M il A2-66 n? M32 Zo/7 //eye/ /N VENTA BY 2. A/M/ - 77AVA

2 June 2, 19, D. HEYER 2,,97 WENTILATED WARIABLE SPEED FWER UNIT Filed Feb. 19, 1934 Sheet-Sheet 2?h zšf 21. a/ Maa EC 2.. A34 A33 A42 M43 A26 66 A36 a27 A2 E 2 a NY A66 /62 GS EN S. R S 2 2. SEEe SE 22 iz2 ÉSee? BY Ž24/ 4 77AAVA

3 June 2, 19. D, HEYER 2,,97 WENTILATED WARIABLE SPED FWER UNIT Filed Feb. 9, 1934 Sheet-Sheet in E Zo/7 //eye/ IN VENTR 4 77ARAVA, V

4 June 2, 19. [Tiff D. HEYER WENTILATED WARIABLE SPEED FWER UNIT Filed Feb. 9, 1934 No. N?ZZZZZZZZZZZZZZ?ÈZ 2,,97. Sheet-Sheet BY Zo/7 aver AAWAAV7AR

5 June 2, 19. D, HEYER 2,,97 WENTILATED WARIABLE SPEED FWER UNIT Filed Feb. 19, 1934 Sheet-Sheet Zo/7/7eye7 Avi AA Toa BY 2-w a 77AAWAE -

6 Patented June 2, 19 2,,97 UNITED STATES PATENT FFICE 2,,97 VENTILATED VARISE PEED PoweR Don Heyer, Lo Angele, Calif., aignor to U.S. Electrical Motor, Inc., a corporation of California Application February 19, 1934, erial No. 711, Claim. (C. 4-2.) Thi invention relate to a power unit and more particularly to a compact arrangement in corporating an electric motor drive, an adjutable peed drive from the motor to a load driving i haft, and a upporting and encloing houing. Preferably the variation in peed i obtained by the aid of a pulley tructure and a belt, in which the effective diameter of the pulley tructure i Variable. In the preent intance, the motor haft i made integral with the driving haft of the ad jutable peed drive. An adjutable pulley truc ture i mounted on the driving haft, and thi tructure i connected by a belt with a imilar pulley tructure on the driven haft. Each of the pulley tructure include a pair of pulley ection having oppoed inclined face which are axially adjutable toward and from each other. A the ection move together, a belt, in driving i contact with both of the inclined face, i moved by the ection radially outward, thereby increa ing the effective diameter. Converely a epa ration of the ection permit the belt to move inwardly, to contact with the face on a Sinaller effective diameter. In order to adjut a belt of contant length to pulley of variable diameter, the two pulley truc ture (driving and driven) are arranged to be oppoitely adjutable; that i, an increae in the effective diameter of the driven pulley tructure i accompanied by a compenating decreae in the effective diameter of the driving pulley truc ture. It i one of the object of thi invention to provide an electrically driven ource of variable peed power, which in application can replace variable peed electric motor wherein the vari ation in peed i obtained by a manipulation of the electrical characteritic of the machine. It i another object of thi invention to pro wide an electrically driven ource of variable peed power which can be operated from com mercial power line with the ue of only that witching equipment common to general purpoe motor. It i till another object of thi invention to provide a portable, compact, encloed, electrical ly driven ource of variable peed power with a large power capacity per unit of weight and volume, It i till another object of thi invention to combine the function of the component mecha nim o a to reduce the total number of part to a minimum. It i till another object of thi invention to provide a power unit in which the orientation of the component part can be interchanged o that the power unit can be mounted in any deired relation to the driven load. It i till another object of thi invention to provide a afe and compact ource of variable Speed power having a houing or caing which Support and protect Subtantially all of the Working part, and that yet permit ready ad jutment or replacement of uch element a the electric motor, the pulley tructure, or the belt. It i till another object of thi invention to provide a mean of maintaining the belt in alignment for all the poition of the adjutable pulley tructure. It i till another object of thi invention S to upport the working mechanim that no diff Cult machining peration are neceary in the contruction of the houing. It i till another object of thi invention to provide mean whereby the ame pulley truc ture may be ued with belt of different length and width. It i till another object of thi invention to permit an initial Setting of the peed ratio while the notor i at a tandtill. It i till another object of thi invention to provide a mean whereby the relative poition of the movable pulley Section may be adjuted to compenate for belt wear or for variation in the dimenion of individual belts. It i till another object of thi invention to increae the life and power tranmiion ca pacity of the belt by providing mean for di ipating the heat generated by the internal and Surface friction of the belt. Thi invention poee many other advan tage, and ha other object which may be made more eaily apparent from a conideration of ne embodiment of the invention. For thi purpoe there i hown a form in the drawing accompanying and forming part of the preent pecification. Thi form will now be decribed in detail, ill lutrating the general principle of the inven tion; but it i to be undertood that thi detailed decription i not to be taken in a limiting ene, ince the Scope of the invention i bet defined by the appended claim. Referring to the drawing: Fig. 1 i a view, mainly in horizontal ection of a power unit embodying the invention, Fig. 2 and Fig. 3 are detailed view of the mean for interlocking the adjutment of the effective diameter of the driving and driven SS 80

7 pulley tructure, Fig. 2 being drawn on a larger Scale than Fig. 3. Fig. 4 i a fragmentary horizontal ection of the driven haft of the adjutable pulley mech anim, illutrating the ue of gearing between the load driving haft and the driven haft and the mean by which the auxiliary gear houing i upported. Fig. and Fig. 6 are plan view illutrating the manner in which the relative poition of the component part can be interchanged. - Fig. 7 and Fig. 8 are vertical ectional view of the motor end of the caing and of the driving pulley tructure illutrating the manner in which the heat i diipated from the belt and pulley urface. Fig. 9 and 10 are detailed view of the motor Supporting mean, viewed from the interior of the caing and from the right of the motor of Fig. 1. Fig. 9 how the relative poition of the motor Supporting mean and of the caing while the motor upporting mean i being entered into the caing. Fig. 10 how the relative poition after the motor upporting mean i brought to it final poition. Fig. 11 i a detail ection a een on plane f /- of Fig.1. In the preent intance a caing i provided, in which ubtantially all of the operating part f the device are accommodated. Thi caing can be provided with appropriate feet, uch a 2, by the aid of which it may be fatened to a upporting bae. In order to provide motive power for the unit, an electric motor 3 i upported by the caing. The manner in which motor 3 i upported will now be decribed. Motor 3 i hown a being of the encloed type with a frame which i ubtantially cylindrical. ne bracket of motor 3 i of the uual motor type, the other motor bracket being replaced by motor upporting member 4 (Fig. 1) which ha many function. Member 4 ha a cylindrical ur face and interrupted flanged urface 6 and 7. Frame f i provided with an aperture 8 having an interrupted interior cylindrical urface 9 and interrupted flanged urface 0 and f. The in terrupted flange 6 of member 4 can be paed through the interrupted cylindrical urface 9 and then rotated until flange 6 and f are in con tact and likewie flange and 0. The cylin drical urface of member 4 i then upported by the cylindrical urface 9 of aperture 8. The contacting urface of member 4 and aperture 8 form a upport imilar to a breechlock, bet in dicated by Fig. 9 and 10, a et crew 8, or ther Suitabie mean being provided to prevent member 4. rotating with repect to the houing. Fig. 9 how the poition of member 4 when entering aperture 8 of the caing. Member 4 i rotated o that the projecting portion of mem ber 4, on which the interrupted flanged urface 6 i formed, coincide with the opening left in aperture 8 by the interrupted cylindrical urface 9. Member 4 can thu be entered into the ca ing in thi poition. In Fig. 10 member 4 i hown rotated into the final poition. The projecting portion of member 4, on which interrupted flanged urface 6 i formed, now coincide with the projecting portion of aperture 8, on which the interrupted cylindrical urface 9 and inter rupted flanged urface and are formed. In thi poition the Surface are in contact a hown in Fig Motor 3 i then fatened to member 6 in a 2,,97 definite angular poition by a uitable Inean uch a bolt f2. The motor i thu firmly and adequately upported by one wall of the caing. Member 4 can alo be provided with one or. more air paage uch a 3 to the notor, where by the normal ventilation of the motor may be maintained. Motor 3 i provided with a haft f4 which Serve a a motor haft and a the driving haft of the adjutable pulley mechanim. Thi haft can thu be deignated a the driving haft. A driven haft f ha an axi parallel with the axi of haft 4, and may be appropriately Supported a hereinafter decribed, in caing f. It may be provided with a load driving exten Sion f6 or the load driving mean may be con nected with the driven haft through appropriate gearing. A pair of adjutable pulley tructure, f T and 8, are upported on haft 4 and repec tively. Each of thee pulley tructure may in clude an axially fixed ection and an axially ad jutable ection, each of the ection having op poed inclined belt engaging face. The pulley Structure are connected by a flexible V-belt 9. A the belt i of contant length the arrange ment i uch that adjutment of the effective diameter of one pulley tructure caue a com penating convere adjutment of the effective diameter of the other pulley tructure. Thu auming for example that the right hand ec tion of pulley tructure f7 i axially fixed With repect to haft 4, then the left hand ec tion 2 i arranged to be moved toward and from Section, repectively, to increae and decreae the pulley diameter. In the correponding pull ley tructure f8, the left hand ection 22 may be axially fixed, or movable only for adjuting the initial belt tenion, for providing mean for maint::ining the belt in alignment or for tak ing up weal' in the belt, while the right hand Section 23 i adjutable toward and from ec tion 22. In thi way, a the ratio of tranmi iion i varied, the belt 9 move in a direction parallel to the axe of the haft and tay in alignment with both pulley tructure. In the preent intance the driving haft 4 and it aociated pulley tructure 7 have one bearing 24 which i axially movable with repect to the driving haft. Bearing 24 i mounted : on hub 2 of the movable pulley ection 2 F. Hub 2 i preed over a buhing 26 of porou elf lubricating material uch a bearing bronze. Hub 2 may be fixed with repect to buhing 26 by a headle crew 27. Buhing 26 i plined to haft 4 by mean of key 28. The urface of haft 4 in contact with buhing 26 may be pro vided with a wear and corroion reiting coating uch a chromium plate or the haft may be cae hardened or otherwie chemically treated to ob tain a urface of high mechanical trength or which reit corroion. Buhing 26 i provided with lubricating aperture 29 through which a lubricant can be upplied from chamber of the bearing houing 3 of bearing 24. The import ance of good lubrication between haft 4 and buhing 26 cannot be overtreed. The movable pulley ection 2 mut be freely lidable with repect to haft 4 under all operating condi tion. Bearing 24 i held in bearing houing 3 by mean of bearing cap 32. The bearing cap 32 i provided with a lubricant retaining Seal 33. Bearing houing 3 i alo provided with addi tional lubricant retaining eal 34 and 3, for re- 7 2

8 2 3 2,,97 taining lubricant in chamber. Pulley hub 2 ha an extended cylindrical urface 36 on which bearing 24 i mounted together with pacing ring 37 and 38. Bearing 24 and pacing ring 37 and 38 are held in place by lock nut 39. By mean of Spacing ring uch a 37 and 38 bear ing 24 may be mounted at any point within the limit of Surface 36. The axial poition of bear ing 24 with repect to pulley ection 2 may be thu varied to accommodate belt of widely dif ferent dimenion. Bearing houing 3 ha an exterior urface which i axially lidable with repect to an in terior upporting urface 4 of member 4. Bear ing houing 3 f i thu axially lidable with re pect to the driving haft 4, and alo with re Spect to the motor upporting member 4. Bearing houing 3 f ha additional mean for retricting rotational movement and for adjuting it axial poition, which will be decribed hereafter. It i apparent from the contruction that an axial movement of bearing houing 3 reult in an 7 equal axial movement of pulley ection 2. It i thu poible to adjut the effective diameter of pulley tructure i7 by adjuting the axial poi tion of bearing houing 3. Attention i drawn to the movable pulley ec tion 2 and it aociated Structure. Bearing 24 erve the triple purpoe of upporting the axial load of the driving haft 4, of tranmit ting the axial and radial load on pulley ection 2 to the bearing houing 3, and that of per mitting the relative rotational movement be tween pulley Section 2 and bearing houing 3 with it aociated hifting mechanim. Bear ing 24 being mounted on pulley hub 2 permit reducing the overhang of pulley tructure T be yond it upport, and thu permit a reduction of the bending moment on the haft and the re Sultant deflection. By mounting bearing 24 n hub 2, buhing 26 can be made of Sufficient length to reduce the load per unit area to the value conitent with the material employed. To maintain a lubricated urface between haft 4 and buhing 26 preent a difficult problem. Although there i no relative rotational move ment between the two part, there i a combined rolling and liding action becaue thee two part are not integrally joined but have intead a light liding clearance. For each revolution of the motor, haft 4 roll a ditance inide of buh ing 26 equal to the circumference of the haft and lide a ditance equal to the difference in circumference of the interior of the buhing and of the haft. Thi rolling action quickly work the lubricant out from between the contacting SurfaceS. Although there i a light relative liding ac tion, the difference in the circumference of the 80 buhing and of the haft i o Small that a por tion of the haft urface alway come in con tact with the ame portion of the buhing Sur face. Commercially it i not practical to form true cylindrical urface. The buhing and haft will actually come into contact only at the pro jecting portion of their urface. If there were a coniderable liding action, thee projecting urface would be quickly worn down t contact would be quite evenly ditributed. the abence of uch motion the compreion tre between the urface remain localized. The roll ing and pounding action of the buhing on the haft produce local heating at the point of highet tre. If thi tre i too great for the material a rapid corroion take place unle the material i corroion reiting. A cale i formed n the contacting urface, which bind the haft inide of the buhing. Thi binding may be o tight at time, that a gear puller or a pre i required for pulling the buhing off the haft. It i obviou that the whole peed adjuting mechanim i rendered inoperative unle the axially movable pulley ection are maintained freely lidable. The preent contruction permit a olution of the problem. The wear and corroion reit ing urface of haft 4 act to prevent eizure of the contacting urface. By making buhing 26 of a porou, lubricant retaining material, a Supply of lubricant i retained at the contacting Surface. Such lubricant retaining material, however, are not capable of withtanding large unit tree. It therefore become neceary to S modify the contruction that a large con tacting Surface i available. Thi i provided in the preent contruction by providing a long buhing 26. Bearing houing 3 f i alo contructed to per mit a free liding action between urface G and the upporting urface 4f of member 4. By the preent contruction thi urface can be made of Sufficient axial length and area to reduce the unit tre to a very low value. Thi permit the ue of lubricant which have a low vicoity at all operating temperature. The fixed pulley ection may alo be plined to key 28 on the driving haft 8. The axial poition of Section may be fixed by mean of Set Screw 42 attached to hub 43 of pulley ec tion. - Both Section of pulley tructure it have fan, on the outide urface, which may be made in tegral with the pulley ection. Pulley ection ha a fan 44 and pulley ection 23 ha a fan. The action of the fan will be decribed hereafter. In the preent intance the driven haft i ha two upporting bearing. ne bearing 66 i fixed With repect to the haft and alo with repect to the frame f. Fixed bearing 46 i held on haft 1 by lock nut 47. Bearing 46 i up ported by a bearing houing in fianged plate 48 Which i in turn ecured to frame f, a by bolt 78. Bearing 46 i held in place by plate 48 and by bearing cap 49. Bearing cap 49 may be e cured to plate 48 by crew. Driven haft i i thu held in axial poition by bearing 46. The nanner in which plate 48 i upported by frame f i of importance. In many application the load driving haft i connected to the driven haft through gearing. Plate 48 i then replaced by an auxiliary gear houing which mut be mounted in the ame relation to frame f a the plate which it replace, Plate 48 ha a flanged urface Sf in a plane perpendicular to the axi of the driven haft i and a cylindrical urface 2 with it axi con centric with the axi of haft. Cae f i pro vided with an aperture 3 which ha a flanged urface 4 perpendicular to the axi of the driven haft and an interior cylindrical urface con Centric with the axi of the driven haft. The cylindrical urface 2 of the plate 48 i centered inide of cylindrical urface of frame. Thee two urface carry the radial load of bearing 46. The axial poition of plate 48 i fixed by the con tact of flanged urface and 4. The other bearing 6 of the driven haft i axially movable with repect to haft. Bear ing 6 i mounted on buhing 7 which i preed

9 3 SS 4. 2,,97 into hub. 8 of the movable pulley ection 23. ture are Symmetrical about a vertical plane S Buhing 7 may be fixed to hub 8 by et crew that they can be mounted at either end of the 9. Buhing 7 mut be freely lidable with re caing with equal facility. Flanged plate 48 of Spect to haft for the ame reaon that Were the driven pulley tructure can be ued in either pointed out with repect to buhing 26 on the end of the cae. Control houing 66 i Syn driving haft. For thi purpoe haft may metrical about a horizontal plane. It can be be provided with a wear and corroion reiting mounted at either end of the caing by a rotation urface imilar to that of driving haft 4. Buh through 180 degree. ing 7 may be made out of bearing bronze or Attention i drawn to the manner in which the. ome imilar porou lubricant-retaining mate driving and driven haft are upported by caing rial. Bearing 6 may be held in place by lock. The urface of aperture 8 and are either nut. Bearing 6 i mounted inide of bear parallel or concentric. The aperture are of Suf ing houing 6 and may be fixed in the hou ficient ize to permit thee urface to be ma ing by bearing cap 62. Houing 6 ha a lubri chined at a ingle etting of caing, either n a cant-retaining eal 63 adjacent to bearing 6. boring mill or on a lathe. The meaurement Bearing houing 6 ha an exterior urface 64 required are only thoe of diameter or ditance which i axially lidable with repect to an in between parallel face. Thee meaurement can terior upporting urface 6 on control houing 66., be taken quickly and accurately. Likewie the It i apparent from the contruction that an urface of aperture 3 and can be machined axial movement of bearing houing 6 reult in at a Second etting of caing f. From the nature of the connection between the driving haft and the driven haft, which i a flexible belt, it i not neceary to maintain the center ditance be tween the two haft nor the angle between the an equal and imilar movement of pulley Section 23. It i thu poible to adjut the effective diameter of pulley tructure 8 by adjuting the axial poition of bearing houing 6. The man ner in which the adjutment of the driving and driven pulley tructure 7 and 8 are interlocked will be decribed hereafter. Attention i drawn to the triple purpoe of bear ing 6. The radial load of the driven haft, and a combined axial and radial load of pulley truc ture 8 i tranmitted by bearing 6 to the Sup porting mean. Bearing 6 alo permit the rel ative rotational movement between bearing hou ing 6 and the movable pulley ection 23. Control houing 66 ha an exterior cylindrical urface 67 and interrupted flanged urface 68 and 69 whereby the control houing i upported in an aperture in the wall of caing. Aper ture to ha an interrupted interior cylindrical urface T and interrupted flanged urface 2 and 73. The cylindrical urface 6 of the con trol houing i upported by interior cylindri cal urface T, and i held againt axial nove ment by the contact of fianged urface 68 and 69 with flanged urface T 2 and T3 repectively. The dimenion of the upporting urface of control houing 66 are equivalent to thoe of the motor upporting member 4; likewie the diment ion of the upporting urface of aperture are equivalent to thoe of aperture 8. A Set crew 86 or other uitable mean may be pro vided to prevent relative rotation of the part, a before. A ventilating cover 74 i provided for caing adjacent to the end of the driving haft, being ecured in place a by bolt 9. Cover ha upporting urface equivalent to thoe of the bearing upporting plate 48. Caing i pro vided with an aperture 7 which upports ven tilating cover 74. The upporting urface of ap erture T are equivalent in every repect to thoe of aperture 3. From the ymmetrical contruc tion of caing it i apparent that the driving haft and it aociated tructure may be inter changed in poition with the driven haft and it aociated tructure. Thi ymmetry of ca ing f i an important feature becaue it enable the variable peed drive to be mounted in any deired relation to the driven load. Fig. and Fig. 6 are plan view illutrating the manner in which the relative poition of the Component part may be interchanged. To make thi interchange in poition of the driving and driven haft no new part are re quired. The motor and the driving pulley truce haft to cloe tolerance. It i thu poible to ue very imple fixture for holding caing dur ing the machining operation. It i, however, neceary to maintain the tolerance to cloe lim it between the tructure on either the driven or driving haft and the bearing upport. By the nature of the preent contruction thee toler ance can be readily maintained. The manner in which caing f i contructed i alo of particular utility in that aperture 8, 3, and 7 may be made of relatively large ize. The motor together with it aociated pulley tructure may be aembled a a unit and entered into the caing through aperture 8. Ap erture 7 provide convenient acce to the belt and pulley tructure. The relative poition of the pulley Section of the driving pulley tructure may be readily adjuted or pulley ection will, in many cae, be ufficiently Small in diameter So that it may be removed through aperture 7 to provide convenient acce to the belt for ad jutment or replacement. The driven pulley tructure i upported by plate 48 and by control houing 66. Plate 48 may be removed from the caing giving acce to the driven pulley tructure and to the belt. By re moving plate 48 the belt may be paed over the driven pulley tructure and over the end of the driven haft. Thi in combination with the re movable ventilating cover 74 provide an ex tremely rapid mean for replacing the belt or for adjuting and aligning the pulley tructure. In Some intance it may be convenient to remove both plate 48 and control houing 66 from their Supporting aperture. In uch intance the belt can obviouly be replaced with extreme eae. In many intance the driven pulley tructure will have a diameter le than that of aperture T which upport control houing 66. In uch cae, control houing 66 together with the driven haft and pulley tructure may be entered or removed from the caing a a unit. The top of caing i provided with a remov able cover 3, ecured in place a by machine crew 80, and bet hown in Fig. 7 and 8. Thi cover permit acce to the adjuting mean of the pulley tructure and for general in pection of the encloed mechanim. The manner in which the driven haft may be upported by the frame ha been dicloed. At- 6

10 tention i now drawn to the remaining tructure asociated with the driven haft. Both ection of pulley tructure 8 have fan n the outide urface which may be made in tegral with the pulley ection. Pulley ection 22 ha a fan 76 and pulley ection 23 ha a fan 77. The action of the fan will be decribed hereafter. Pulley ection 22 ha a hub 78 which i axially lidable over buhing 7. Hub 78 ha a pin 79 ex tending through a lot 80 in buhing 7 and through lot 8 f in driven haft 1. The driven haft ha a hollow chamber 82 provided at ne end with a crew plug 83. Screw plug 83 i pro vided with a lubricant hole 84. A compreion pring 8 i mounted in chamber 82 with one end preing againt plug 83 and the other end preing againt pin 79. The preure of pring 84 i tranferred by pin 79 to pulley ection 22, which in turn tranmit the force to belt 9. The axial force on the edge of the belt can be thu adjuted by uing pring of different trength for pring 8, and by varying the preure ex erted by individual pring by adjuting the po ition of crew plug 83. Lubricating aperture 86 are provided in driven haft connecting cham ber 82 with buhing 7. Buhing 7 i plined to hub 78 by key 87 and to haft by key 88. Hub 78 mut be maintained freely lidable with repect to buhing T for the ame reaon that were pointed out with regard to the other axially movable pulley ection. For thi purpoe the contacting urface of hub 78 may conit of a wear and corroion reiting coating depoited or formed on a upporting Surface of the hub. The lubricating chamber and paage of the driven pulley tructure are of particular utility in that they are formed at a radiu maller than that of the urface which mut be lubricated. The rotation of the haft and of the lubricant produce a centrifugal force urging the lubricant between the contacting urface. If it i deired, pulley ection 22 may be fixed to driven haft without mean for axial move ment. However, in that cae it i neceary to adjut the initial belt tenion or compenate for belt wear by manually adjuting the axial poition of pulley ection.. By the ue of pring 8 it i poible to maintain a contant axial force on the belt for all poition of the adjutable diameter pulley and alo to main tain an eentially contant axial force on the belt in pite of elongation or wear of the belt. By a proper contruction of the mean for interlocking the axial adjutment of the two pulley tructure, pring 8 can alo erve a a mean for maintaining the belt in alignment. Thi feature of the contruction will be de cribed hereinafter. The ue of pring 8 and the tructure ao ciated with pulley ection 22 permit an initial adjutment of the peed ratio while the pulley tructure i at tandtill. In many application where it i neceary to accelerate mae which acquire a large momentum it i deirable to re duce the force required for the acceleration to a minimum. If the peed ratio can be adjuted at tandtill to the point where the peed of the driven haft i a minimum, the force required for the acceleration will alo be a minimum. With the angle commonly ued for the conical pulley face, the force at the edge of the belt fall with in the cone of friction. It i thu impoible to produce any radial motion of the belt over the conical pulley face unle the pulley are in rota 2,,97 S tion. By the preent contruction the bearing houing 6 may be moved, at tandtill, in the direction to increae the effective diameter of the driven pulley. Inamuch a the belt i un able to move over the pulley face, pulley ection 23 and 22 move toward the left a a unit. Pin 79 move along lot 8 to compre pring 8. When the motor i tarted, pring 8 force pin 79 and pulley ection 22 toward the right, forc ing the belt radially, outward to the poition determined by the initial etting of the peed control mechanim. Thi action take place very quickly during the firt few revolution of the motor. It i thu poible to tart load which acquire a large momentum without high accelerating force. Bearing houing 6l may be moved axially by lead Screw 89 which engage an internal thread 90 of bearing cap 62. Lead crew 89 i held in fixed axial poition and rotatably upported by bearing 9 ecured in bearing houing 92 on control houing 66. Lead crew 89 i provided with a hand wheel 93 which i keyed to crew 89 by Suitable mean and i held on lead crew 89 by lock nut 94. By a rotation of the hand wheel the lead crew can move the bearing houing 6 and it aociated pulley ection 23 to any de ired poition within the limit of the mecha nim. A the poition of pulley ection 23 i interlocked with that of the pulley ection 2, the Speed ratio can be varied in the manner previouly decribed by rotating handwheel 93. The pulley Structure of the driven haft ha now been decribed. A na been previouly mentioned, when the driven pulley tructure ha an external diameter le than that of aperture. 10, the entire aembly of the driven haft may be entered into the caing a a unit. In intance where the diameter of the driven pulley truc ture i larger than aperture, it i till poible to aemble pulley ection 22 and 23 together with bearing houing 6 a a unit and to enter the unit into the caing through the bottom of the caing, which i entirely open, a hown in Fig. 7 and 8. The pulley tructure can then be mounted on the driven haft by paing the driven haft into the caing through aper ture 3. In order to adjut the limiting poition of the movable pulley ection to accommodate variou width and length of belt an adjutable top i provided for limiting the movement of the peed adjuting mechanim. Control houing 66 ha an aperture 9 and et crew 96. A buhing 97 having an internal thread may be fixed in any deired poition inide of aperture 9 by mean of Set crew 96., A rod 98 having an offet wide head 99 and a threaded portion 100 i held in axial poition by buhing 97. The threaded portion f of rod engage the internal thread of buhing 97. Bear ing houing i i provided with a groove, on it exterior urface, into which head 99 of rod project. The movement to the right of bearing houing 6 i limited by the contact of bearing cap 62 with head 99. The movement to the left of bearing houing B i limited by the con tact of bearing cap 62 with buhing 97. The contruction permit the ready axial adjutment of both rod 98 and buhing 97. Rod 98 can be rotated to the angular poition where bearing cap 62 doe not contact head 99. Rod 98 i et in thi poition during the aembly of the unit. It i deirable to indicate the etting of the peed ratio adjuting mechanim. For thi pur 2 3

11 ,,97 poe a peed indicator i2 i provided. A pointer minate in a groove 4 on the exterior urface 03 having a pivot 104 upported by bae 0 of bearing houing 4. Groove f4 i connected ecured to control houing 66, a by crew 82, by aperture with lubricating chamber and i actuated by the poition of bearing cap 62. Bearing cap 62 i provided with everal tapped hole 106, to accommodate different belt. A pin T may be threaded a deired ditance into the correct hole 6. The head of pin 0, bear againt projection fo8 of pointer 03. Any Suit able yielding mean uch a a pring 8 may be ued to maintain projection 08 in contact with pin 07. Pointer 03 i provided with an adjut able pointing head 09. The peed of the driven haft, correponding to the etting of the Speed control mechanim and to the motor Speed i indicated by the poition of the pointing head f09 on a uitable graduated cale 0. The ue of thi peed indicating mechanim i of par ticular utility with motor whoe peed i een tially contant. When the poition of the driving and driven haft are interchanged in caing, control hou ing 66 i rotated through 180 degree. Speed in dicator bae 0 may then be removed and re placed in an inverted poition to bring Speed in dicator 2 to the correct poition with repect to the power unit. Inamuch a the reading of the peed indicator i determined by the poition of the Speed control mechanim it i poible to determine before tarting the motor at what peed the driven haft will operate when the motor reache full peed. Thi ability to determine beforehand the operat ing peed i of particular utility when it i re quired to tart load which acquire a large mo mentum. By the preent contruction it i poi ble to adjut the peed control mechanim, at tandtill, to the poition at which the peed of the driven haft will be a minimum. By mean of the peed indicator it i poible to determine what adjutment i neceary before tarting the motor and during the normal operation of the variable Speed power unit. The manner in which the axially movable tructure on the driving and driven haft are contructed, the importance of maintaining good lubrication for the contacting Surface, and the manner in which the part cooperate to assure good lubrication have all been dicloed. It i, however, neceary to provide mean for renew ing the upply of lubricating material. The ur face to which the lubricant mut be Supplied are not readily acceible. It i threfore deirable to provide a contruction uch that the upply of lubricant can be quickly and conveniently re plenihed without interrupting the operation of the machine and Without danger to the operator. Appropriate lubrication can be provided for the contacting urface between leeve 26 and haft f4 by paing lubricant to chamber 39. Similar ly, lubricant can alo be paed to the chamber around bearing 24. Although in ome intance different type of lubricant for thee two ue may be deirable (in which cae eparate lubri cator would be provided), ordinarily a common lubricant for both purpoe i atifactory. ne way of upplying lubricant will now be decribed. In the preent intance motor upporting men ber 4 i provided with an aperture, extending from a urface outide of caing to the bearing houing upporting urface 4. The acceible end 2 of aperture may be tapped to accom modate any convenient lubricating fixture uch a thoe commonly employed with preure lubri cator. The interior end 3 of aperture ter by aperture f 6 with bearing 24. The manner in which the lubricant i upplied from chamber to the contacting urface ha already been dicloed. Control houing 66 i provided with a lubricat ing aperture, with exterior end 8, and in terior end 9, terminating in groove on the exterior urface 64 of bearing houing 6. Groove 10 i connected by aperture 2 with the interior of bearing houing 6l. The manner in which the lubricant then reache the contacting urface i apparent from the contruction and the previou dicloure. A circular groove 22 may be pro vided on interior urface 6 of control houing 66, whereby lubricant can be upplied between ur face 64 and 66. Lubricating aperture and 7 have their exterior end 2 and 8 in an acceible loca tion where it i poible to inject a lubricant di rectly or by mean of tubing leading to a remote reervoir. The contruction of the entire variable peed power unit i uch that a free operation of the peed adjuting mechanim i aured under all operating condition. The lubricating paage are built into the member which they lubricate. The interior of the caing i not obtructed by any lubricant conducting tubing or other lubri cating fixture which prevent ready acce to the belt, or pulley for adjutment or replacement. The mean by which the movable pulley ec tion 2 and 23 are adjuted axially ha already been dicloed. In the preent intance the poi tion of bearing houing 3 i interlocked with that of bearing houing 6 by mean of the lever y tem hown in Fig. 2 and 3. Bearing houing 3 i provided with two radially extending pin 23. Motor upporting member 4 i provided with two lot 24 which permit and guide the axial move ment of bearing houing 3 and the attached pin 23. Pin 23 are engaged by the lotted end 2 of forked lever 26. Lever 26 pivot about pin 27 which i mounted on an extending ear 28 on member 4. Member 4 i provided with a imilar ear 29 which may be ued when the poition of the driving and driven haft are in terchanged in the caing. A common pivot pin i engaged by lotted end 3 of lever 26 and by aperture 32 of forked lever 33. Lever 33 i pivoted about pin 34 which i engaged by aperture 3 of lever 33. Pin 34 i mounted on an extending ear 36 on control houing 66. Bearing houing 6 f i provided with pin 37 which are axially movable in lot 38 on control houing 66. Pin 37 are engaged by lotted end 39 of forked lever f33. By mean of the lever ytem, hown, an axial movement of bearing houing 6 in one direction reults in a imultaneou axial movement of bear. ing houing 3 in the ame direction. However, bearing houing 6 and 3 are attached to oppo. ite facing pulley ection 23 and 2. The move ment produced i thu preciely that required for Compenating the change in the effective diam eter of the pulley tructure. In Fig. 2 and 3 the lever arm of pin about pivot pin 34 i hown greater than the lever arm of pin about pivot pin 27. The lever arm of pin 3 about pivot pin 34 i hown equal to that of pin 23 about pivot pin f2. It i thu evident that with the contruction hown the axial move ment of bearing houing 3 and pulley Section

12 2 2,,97 i greater than the axial movement of bearing houing 6 and pulley ection 23. Depending on the relative diameter of the driving and driven pulley tructure, the axial movement of the ad jutable pulley Section of the driving pulley truc ture may be made greater or le than that of the driven pulley tructure, by the ue of uitable val lue for the four lever arm of the interlocking Sytem. Where relatively high peed electric motor are ued it i advantageou to make the maximum value of the diameter of the driven pulley truc ture greater than that of the driving pulley tructure. he relative axia adjutment of the. driven pulley tructure. Should conequently be le than that of the driving pulley tructure. The contruction permit the poitive and accurate adjutment of the effective diameter of both the driving and driven pulley tructure, The poition of lever 26 and 33 are inter locked by pivot pin. Pivot pin i pro vided with two eccentric contacting urface and 41. Surface contact aperture 32 of lever 33. Surface 4 contact lot 3 of lever 28. A rotation of pin about it axi produce a can like hifting of the relative poi tion of lever 26 and 33. Thi in turn pro duce a imultaneou hift in the relative poi tion of pulley ection 2 and 23. Pulley ec tion 2 and 23 may be made to approach each other or to eparate by rotating pin. The relative poition of pulley Section 2 and 23 may be thu adjuted by rotating pin f to the required poition. The pulley Section may then be locked in thi relative poition by locking the pin. Pin i provided with a lotted head 42 to ait in rotating the pin. Lever 33 i provided with a et crew 43 for locking pin in poition. By thi contruction the relative poition of the movable pulley ection 2 and 23 may be adjuted over a wide range to accommodate belt of different width and length and to Con penate for elongation and wear of the belt. By the ue of pacing ring 3 and 38 the poition of pulley ection 2 may be changed to accom modate belt of different dimenion. By mean of pin and the aociated tructure it i po ible to adjut for variation in the dimenion of individual belt or pulley, and for belt wear. The contruction provide three pulley ec tion 2, 22 and 23 which are all relatively ad jutable. Thi i the leat number of relatively adjutable pulley ection required if the belt i to be maintained in alignment under all condition of operation. The contruction alo permit the accurate alignment of the pulley tructure on the driven haft with that of the driving haft in pite of large variation in the relative location of the driving and driven haft in the caing. The manner in which the reta tive poition of pulley ection 2 and 23 may be adjuted ha been dicloed. If pulley ection 22 i axially fixed, the alignment of the belt mut be effected by a careful etting of the axial poition of pulley ection.. By the preent contruction, pulley ection 22 i elf-aligning in repone to the belt dimenion and the poition of the remaining pulley Section. Where a notor i driven from a contant fre quency, alternating current, Source of power, the number of ayailable motor peed i limited, For each notor Speed the dimenion of the belt, pulley, and cae have certain optimum value which determine the range of peed which can be obtained economically at the driven haft. The Speed range required at the load driving haft i, however, a function of the connected load and not of the ource of power. It i there fore advantageou to o contruct the variable Speed unit that gearing may be readily inter poed between the load driving haft and the driven haft of the variable peed drive. It i of particular utility to o incorporate the gearing in the variable peed power unit that a unit may be aembled with or without gearing by the in terchange of a minimum number of part. Fig. 4 how a ectional view of the driven haft of the variable peed drive with gearing interpoed between the load driving haft and the driven haft. In thi intance the driven haft of Fig. 1 i replaced by the driven haft 44 of Fig. 4. Shaft 44 ha an axially fixed bearing ecured in a bearing houing 46 in a wall of auxiliary gear houing 47. Bearing i held in place by pacing ring 48 and bearing cap 49. Bearing cap 49 i pro vided with a lubricant retaining eal. A driving gear f i ecured to and upported by the driven haft 44. Driving gear may be provided with a hank 2 which may be Secured in a hollow chamber 3 in the end of the driven haft 44. Bearing i held on haft 44 by a pacing ring 4 interpoed be tween driving gear and bearing. If the driving gear ha a ufficiently large diameter it may be mounted directly on a gear upporting extenion of haft 44. Driving gear engage driven gear mounted on load driving haft 6. Load driv ing haft 6 i provided with a load driving ex tenion 7 projecting outide of gear houing 4. Load driving haft 6 i upported by bearing 8 and 9. Bearing 8 i upported by a bearing houing in a wall of the gear houing f4. Bearing 9 i upported by a bearing houing 6 in cover 62 of the gear houing. Cover 82 i provided with a flanged urface 83 and an exterior cylindrical urface 64 con centric with the axi of the load driving haft. Gear houing 47 i provided with a flanged ur face 6 and an interior cylindrical urface 66 with it axi concentric with that of the load driving haft. Cover 62 i located with repect to the gear houing by the contact of flanged Surface 83 and 6 and by the peripheral con tact of exterior cylindrical urface f S with in terior cylindrical urface 66, and i ecured in place a by bolt 84. Cylindrical urface 64 and 66 need only be in contact for an angle lightly greater than 180 degree. Inamuch a a lubricant mut be upplied for the gear, the Contact of flanged urface 63 and 6 alo Serve to Seal the lubricant in the gear houing. Gear cae cover 62 i provided with a lubricant retaining eal 8 to prevent the lubricant from ecaping along the load driving haft. Gear cae 4 i provided with a flanged Sur face 68 in a plane perpendicular to the axi of the driven haft 44 and with an exterior cylindrical urface 69 concentric, with the axi of haft 44. Gear cae 4 i upported by Surface 4 and of aperture 3 of houing which have been previouly decribed, bolt 83 erving to ecure it in place. The axial poition of gear cae 47 i fixed by the contact of flanged urface 68 and 4. 7 Gear cae 47 i radially upported by the contact of cylindrical Surface f and. 2 3 SS 0.

13 o S 2,,97 A ventilating opening may be provided in exterior urface of pulley ection into the in the auxiliary gear cae for aiting in the ven terior Space of caing. tilation of caing. A removable vertilating cover 73 with down Gear cae f4 and fanged plate 48, Fig. 1, are Ward facing opening 4 i provided for caing fully interchangeable with repect to the Sup, Screw 8e erving to ecure it in place. Addi porting urface of aperture 3. Driven haft tional air paage f 1 may be provided between 44 may be identical with driven haft, Fig. 1, the bae and the bottom of the wall of the ca except for the difference noted. ing. Louvre 6 may alo be placed in the wall By thi contruction it i thu poible to a of the caing a hown in Fig. 8. Air may thu emble a unit with or without gearing by the be dicharged from the caing by ventilating imple interchange of flanged plate 48 and driver. pening 4, and 76 and by ventilating haft of Fig. 1 with the gear aembly and opening of the auxiliary gear houing of driven haft 44 of Fig. 4.. Fig. 4. The manner in which the auxiliary gear hou The ventilating opening of Fig. 7 and 8 all ing i upported by cae i of particular utility have downward facing opening. The unit can in that, by removing bolt 83, the gear houing thu be expoed to falling liquid without the may be rotated upon cylindrical Surface psibility of the liquid entering the caing. around the axi of the driven haft 44 to any In Some intallation it may be deirable to deired angular poition a determined by the provide Screen Such a 77 (Fig. 7) over the ven hole provided for the bolt. The load driving tilating pening to prevent the entrance of for haft 6 may thu be readily located in a large eign object into the caing. number of poition with repect to cae. Thi The normal motor ventilation i maintained in turn allow the variable peed power unit to by Ventilating paage 3 of the motor upport be located in a many poition with repect to ing member 4. By thi contruction eparate the driven load. The contruction alo aure an accurate alignment of the gear. The concentricity of aperture 3 and of cae, and the perpendi cular relation of urface 4 to the axi of the cylindrical urface i aured by the manner in which thee urface may be machined. The upporting urface 68 and 69 of gear cae 47 and of bearing houing 84.6 may be ma chined at a ingle etting of the auxiliary gear houing 47 in a boring mill or lathe. The con centricity of cylindrical urface 69 with bearing houing 46 and the perpendicular relation of flanged urface 68 to the axi of the cylindrical urface 69 i thu aured. The cover upporting urface f6 and 66 and bearing houing 69 may all be machined at a econd etting of the gear cae in a boring mill or lathe. For thi purpoe gear cae i may be held in a jig which locate urface 6 and 66 in correct relation to urface 68 and 69. urface 63 and 66 and bearing houing 6 may all be machined at one Setting of the gear cae cover in a lathe, thu auring the correct relative location of thee Starface. The axe of the driving and driven gea' are maintained parallel and at the correct center ditance by the nature of the contruction itelf. The gear cae and gearing may be freely di aembled for inpection or replacement with the poitive aurance that all the component part may be reaembled in their correct relative poition. The proviion of fan 4,, 76 and on the exterior urface of pulley ection, 2, 22, and 23 ha already been noted. Fig. i a ect tional view of the motor end of the caing and of the driving pulley tructure illutrating the manner in which the heat i diipated from the belt and pulley urface. Fig. 8 i a ectional view of the caing in a plane perpendicular to the axi of the driving haft. In the preent intance cae i provided with a removable ventilating cover plate which may be provided with downward facing opening uch a and an air deflector 2. The rotation of fan 44 of pulley ection pro duce a decreaed preure inide air. deflector T2. Air i drawn into the caing through open ing T and i directed toward fan by the de flector. The air pae radially outward ver the ventilation may be provided for the motor, and for the caing. The material available for the in ulation of the motor are uch that they are able to uccefully Withtand much higher temper ature than the driving belt in the caing which i ubject to a continuou mechanical deformation.. It i of particular utility to place fan on the exterior urface of the pulley ection. The fan produce a circulation of air over the exterior Surface of the pulley ection thereby cooling that urface. The heat i thu carried from the pulley ection to the air encloed in the houing. The heat may then be diipated from the hou ing by exhauting the heated air to the outide of the caing or the heat may be conducted from the air to the wa of the Caing and then may be diipated from the exterior urface of the caing to the urrounding atmophere. When a belt, with pulley engaging ide, i operated without any encloing caing, the tem perature of the belt and pulley face i increaed, but lightly over that of the urrounding medium. The heat, generated by the internal friction of the belt and by the urface friction of the edge of the belt againt the pulley face, i readily diipated. a At a contant temperature, the rate of power diipation per unit volume by the internal fric tion of the belt varie directly a the frequency of the tre cycle and a the quare of the maxi num tre. When no encloing caing i required the con truction generally ued reult in low tre value and in a mall value for the urface fric tion lo. The diameter of the pulley, and the ditance between the pulley center are relatively large. The belt tenion and the lateral pre ure of the pulley face on the belt are Small. When a belt i bent, the train produced i directly proportional to the change in curvature. Each time a belt pae ver a pulley it i bent from a traight line to the radiu of the pulley and i then unwound again to form a traight line. For thi tre cycle the total change in curvature i inverely proportional to the pulley radiu. The ue of large diameter pulley thu reult in a mall value for the internal belt fric tion. A long ditance between the pulley center reult in a low frequency for the tre cycle. The rate of heat generation and the reultant i

14 ,,97 rie in temperature are thu mall when no en cloing caing i required. The contruction of a portable, compact, en cloed, variable peed power unit reult in lim itation which are not readily apparent. The pulley diameter and the ditance between pulley center mut be reduced to a minimum. A max imum value of belt tenion and belt velocity mut be ued to maintain a large power tran miion capacity. In order to obtain a wide variation in peed ratio with a belt of moderate width, it i neceary to ue a Small included an gle between the pulley face. Thi reult in a large lateral preure on the belt and in an in creaed wiping action of the belt over the pulley face when entering and leaving the pulley tructure.... A high belt velocity in combination with mall pulley diameter and a hort ditance between pulley center reult in a high frequency for the tre cycle and in large tre value. The increaed belt tenion produce large lateral compreion force on the belt which reult in large internal friction loe and in a high value for the urface friction between the belt edge and the pulley face, thu the power per unit volume which i diipated by the internal and Surface friction of the belt reult in a high rate of heat generation. In addition to a higher rate of heat genera tion the mean for removing the heat from the belt i greately impaired. The temperature of the belt and of the pulley face in contact with the belt will be greatly increaed unle mean are provided for rapidly removing the heat from thee urface. The material available for belt contruction are uch that the tre reiting propertie are greatly influenced by temperature. The afe tre, determined by the fatigue limit, decreae rapidly for only a mall increae in temperature above the normal ambient value. The value. which may be uccefully employed for the pull ley diameter, the belt velocity, the belt thick ne, the belt tenion, and all the other dimen ion which determine the tree and the rate of heat generation by the belt are thu a func tion of the belt temperature. Thee dimenion are the very one which determine the power tranmiion capacity of the variable peed pow er unit. In thi manner the belt temperature be come a limiting factor for the entire contruc tion. Thi important relation between the belt tem perature and the power tranmiion capacity ha not been appreciated. The fatigue limit of a belt Subject to a tre cycle i greatly lowered by temperature which apparently produce no detrimental effect to imilar material not ub ject to a tre cycle. Moreover, the region of heat generation i concentrated in the belt and at the contacting pulley Surface. The reultant temperature of the belt may thu be very high without producing an alarmingly high tempera ture rie on the exterior urface of the caing. By placing the fan on the exterior urface of the pulley ection a contant tream of air i provided for removing the heat generated by the belt. The temperature of the belt and of the pulley can be maintained at a value but lightly greater than that of the air in the caing. By providing mean for ventilating the ca ing, the temperature of the air inide and out ide of the caing may be held at ubtantially the ame value. In intallation ubject to acid fume or other detructive agent or where there i danger of exploion, it may be deirable to eal the caing entirely. Under uch circumtance the fan on the pulley ection are of particular utility, in that the air ha it greatet velocity adjacent to the pulley urface. In thi manner the thick ness of the film of air which cling to the pulley Surface i reduced to a minimum. Thu the rate of heat tranfer from the generating area to the cooling medium i greatly increaed. The air in turn tranfer the heat to the wall of the caing thereby providing a comparatively large urface for diipating the heat to the urrounding medium. The preent contruction 1 permit the tranfer of heat to the exterior of the caing with a minimum of power conumption by the cooling mean and therefore with a mini mum of additional heat generation. A high belt temperature, in addition to de creaing the tre reiting property of the belt, increae the frictional loe of the belt. 9) When the tre in a material ubject to a tre cycle approache the fatigue limit the rate of heat generation by the tre cycle i greatly increaed. The heating of the belt thu produce a cumula tive effect which reult in the rapid detruction f the belt. The material available for belt contruction are uch that when they become heated they produce an adheive film on the pulley urface. When a belt enter and leave a pulley it weep acro a portion of the pulley face. If thi ur face i coated with an adheive film, the fric tional loe are increaed and in addition a violent vibration of the belt i produced. The contruction decribed provide mean for increaing the life and power tranmiion capac ity of the belt which thereby enable the con truction of a portable, compact, encloed ource of variable Speed power with a high power capac ity per unit of weight and volume. I claim: 1. In an encloed variable Speed power unit, an electric motor having a haft, aid haft forming the driving haft of Said variable peed power unit, an adjutable pulley tructure mounted n aid driving haft, a driven haft, an adjutable pulley tructure mounted on aid driven haft, a belt in active driving relation to aid pulley tructure, a caing encloing aid belt and pull ley tructure, aid caing providing a degree of encloure ufficient to prevent the inadvertent entrance of foreign object, a load driving mean operated by the driven haft and projecting out ide of aid caing, and mean, joining the motor and the caing, for Supporting the motor on the caing, aid mean having a ventilating paage way for the motor. 2. In an encloed adjutable peed power unit, a driving haft and a driven haft, an adjutable pulley tructure in axial driving relation to each of aid haft, each of aid pulley tructure in cluding a pair of pulley ection having oppoed inclined belt engaging face, forming by relative axial adjutment variable effective pulley diam eter, a belt in active driving relation to aid pulley tructure, a caing encloing aid belt and pulley tructure, aid caing including wall and a top, mean cooperating with aid caing for rotatably upporting aid haft, mean for poitively adjuting the axial poition of oppo ite facing pulley ection of the driving and driven haft, mean for poitively interlocking the axially adjuting mean of aid pulley ec

15 6 7 1 tion, and mean for poitively adjuting the relative poition of one of aid axially adjut ing mean with repect to aid interlocking mean, Said lat named mean including an ele ment having an eccentric formed thereon, where by a rotation of aid element reult in aid ad jutment. 3. In an adjutable peed power unit, an ad jutable pulley tructure, aid adjutable pull ley tructure including a pair of pulley ection having oppoed inclined belt engaging face, forming by relative axial adjutment variable effective pulley diameter, a haft in axial driv ing relation to aid pulley tructure, mean for adjuting the axial poition of one of aid pull ley Section and mean carried by aid one ec tion for varying the relative poition of aid ec tion with repect to the axial adjuting mean. 4. In a variable peed drive, a driving haft and a driven haft, a driving motor in active driving relation to aid driving haft, an adjut able pulley tructure in axial driving relation to each of Said haft, a belt in active driving re lation to Said pulley tructure, mean for ad juting the effective diameter of at leat one of aid pulley tructure, a frame, and mean for Supporting aid driving motor, aid adjuting mean, and aid driving and driven haft on Said frame, aid upporting mean providing mean whereby the poition of aid driving and driven haft together with their repective pull ley tructure, a well a of the driving motor and adjuting mean, may be interchanged with repect to the frame.. In an adjutable peed drive, mean form ing an adjutable ratio power tranmiion, aid adjutable ratio power tranmiion including a driving haft, a driving pulley tructure mounted on aid driving haft, a driven haft, a driven pulley tructure mounted on aid driven haft, and a belt for tranmitting power between aid pulley tructure, at leat one of aid pulley tructure having an adjutable effective diam eter, a houing encloing aid tranmiion, aid houing having a pair of oppoed wall, each of aid wall having a pair of aperture formed therein, each of aid aperture being in aline ment with an axi of the drive, and mean form ing a removable cover for each of aid aperture, at leat one of aid aperture formed in each of aid wall providing ubtantial acce to the in terior of aid houing, upon the removal of the repective cover. 6. The tructure a et forth in claim, with the addition of mean forming an auxiliary gear houing, and mean for Supporting aid auxiliary gear houing on ne of Said removable cover, 7. In an encloed electrically driven variable Speed power unit, a driving haft and a driven haft, an electric motor including a tator and a rotor, aid rotor being in axial driving relation to aid driving haft, a pair of adjutable pulley tructure in repective axial driving relation to each of Said haft, a belt in active driving rela tion to aid adjutable pulley tructure, a caing encloing aid belt and pulley tructure, a load driving mean projecting outide of aid caing and actuated by aid driven haft, mean co perating with aid tator and aid caing where by the motor may be upported by one wall of Said caing, and bearing mean for rotatably up porting aid driving haft, aid motor upporting mean providing a upport for aid bearing mean and having a ventilating paage formed therein for the motor ventilation. 2,,97 8. In a variable peed power unit, a driving haft, a driven haft, pulley tructure repec tively in axial driving relation to aid haft, at leat one of Said pulley tructure having an ad jutable effective diameter, a belt in active driv ing relation to aid pulley tructure, a caing encloing the belt and the pulley tructure, mean whereby a ource of power may drive aid driving haft, an auxiliary houing upported by a wall of the caing and adjacent the driven haft, bearing mean for rotatably upporting Said driven haft and Supported by the houing, and gearing mean in Said houing in power tranmitting relation to aid driven haft, aid gearing mean having a load driving haft ex tenion projecting out of the auxiliary houing, aid load driving haft extenion having an axi paced from that of the driven haft, aid auxil iary houing being angularly adjutable about the axi of the driven haft, 9. In a variable ratio tranmiion, a haft, an adjutable pulley tructure in axial driving relation to aid haft, aid pulley tructure hav ing a pair of Section with oppoed inclined face, forming by relative axial adjutment, variable effective pulley diameter, bearing mean for ro tatably Supporting aid haft, a non-rotating upport for the bearing mean, aid upport being axially adjutable, one of aid pulley ec tion being axially adjutable on the haft and lidable thereon by axial movement of aid Sup port, there being a continuou paage from the non-rotating upport to the contacting ur face between the haft and the aid one of aid Section, aid upport being provided with a com municating paageway for the ingre of lubri cant to the continuou paage. 10. In a variable ratio tranmiion, a pair of haft, a pair of pulley tructure repectively, mounted n Said haft, each of Said pulley tructure having a pair of ection with oppoed inclined belt engaging face forming by relative axial adjutment, variable effective pulley diam eter, a belt'engaging both of Said tructure, and poitive mean for imultaneouly axially adjut ing one ection of one tructure and one ection of the other tructure, for increaing one pulley diameter and decreaing the other pulley diam eter, compriing a pair of interlocked lever, repectively aociated with aid adjutable ec tion, one lever having a different leverage from the other, 11. In a variable ratio tranmiion, a pair of haft, a pair of pulley tructure repectively mounted on aid haft, each of aid pulley tructure having a pair of ection with oppoed inclined belt engaging face forming by relative axial adjutment, variable effective pulley diam eter, a belt engaging both of aid tructure, poitive mean for imultaneouly axially adjut ing one ection of one tructure and one ection of the other tructure, for increaing one pulley diameter and decreaing the other pulley diam eter, compriing a mechanim imparting a greater movement to one of aid adjutable ec tion than to the other of aid adjutable ec tion, and reilient mean for urging one of the other ection toward it companion ection. 12. In a variable ratio tranmiion, a pair of haft, a pair of pulley tructure repectively mounted on aid haft, each of aid pulley truc ture having a pair of ection with ppoed inclined belt engaging face forming by relative axial adjutment, variable effective pulley diam eter, a belt engaging both of aid tructure, G 6

16 2,,97 poitive mean for imultaneouly axially adjut ing one ection of one tructure and ne ection of the other tructure, for increaing one pulley diameter and decreaing the other pulley diam eter, compriing a pair of interlocked lever, re pectively aociated with aid adjutable ec tion, one lever having a different leverage from the other, and reilient mean for urging one of the other ection toward it companion ection. 13. In a variable ratio tranmiion, a driving haft, a driven haft, a pair of pulley tructure repectively in axial driving relation to aid haft, at leat one of aid pulley tructure hav ing a pair of relatively axially adjutable Sec tion with oppoed inclined face, forming by relative axial adjutment, variable effective pulley diameter, a frame for upporting aid tructure and the haft, bearing tructure aociated with each haft, and mean detachable from the frame for upporting aid bearing tructure thereon, aid frame having upporting urface repectively for aid detachable bearing upport ing mean, and aid bearing upporting mean having correponding dimenion, whereby the driving and driven haft, with their aociated pulley tructure and bearing upport, may be interchanged in poition with repect to aid frame. 14. In a variable ratio tranmiion, a driving haft, a driven haft, a pair of pulley tructure repectively in axial driving relation to aid haft, at leat one of aid pulley tructure hav ing a pair of relatively axially adjutable ec tion with oppoed inclined face, forming by relative axial adjutment, variable effective pull ley diameter, a caing for upporting aid truc ture in aid caing repectively adjacent the haft, a cover member for each of aid aperture detachably ecured to the caing, a bearing tructure aociated with the driven haft, ne of aid cover member including mean for up porting aid bearing tructure, aid caing having upporting urface for aid cover, and aid cov er having correponding dimenion, whereby the driven haft, with it aociated pulley truc.ture and bearing may be optionally upported in either of aid aperture. 1. In a variable ratio tranmiion, a driving haft, a driven haft, a pair of pulley tructure repectively in axial driving relation to aid haft, at leat one of aid pulley tructure have ing a pair of relatively axially adjutable ec tion with oppoed inclined face, forming by relative axial adjutment, variable effective pulley diameter, a caing for upporting aid. 11 tructure and the haft, a ource of power in driving relationhip with aid driving haft and having a frame bearing tructure aociated with each haft, aid frame being arranged to upport the bearing tructure aociated with the driv ing haft, peed adjuting mechanim aociated with the driven pulley tructure and having a houing, aid houing erving to upport a bear ing tructure aociated with the driven haft, aid caing having upporting urface repec tively for aid frame and aid houing, and aid frame and aid houing having correponding di menion, whereby the driving haft, together with it aociated pulley tructure and ource of power, bay be interchanged in poition with the driven haft together with it aociated pulley tructure and peed adjuting mechanim, with repect to aid caing. 16. In a variable ratio tranmiion, a driving haft, a driven haft, a pair of pulley tructure repectively in axial driving relation to aid haft, at leat ne of aid pulley tructure hav ing a pair of relatively axially adjutable ec tion with oppoed inclined face, forming by relative axial adjutment, variable effective pulley diameter, a caing for upporting aid tructure and the haft, aid caing having a pair of oppoed wall, a ource of power in driv ing relationhip with aid driving haft and hav ing a frame, bearing tructure aociated with each haft, aid frame forming the ole upport for the bearing tructure aociated with the driving haft, peed adjuting mechanim a0n clated with the driven pulley tructure and hav ing a houing, aid houing erving to upport a bearing tructure aociated with the driven ture and the haft, there being a pair of aper haft, one wall of aid caing having upporting urface repectively for aid frame and aid houing, aid frame and aid houing having correponding dimenion, the other Wall of aid caing having a pair of aperture, repectively adjacent the haft, a cover member for each of aid aperture detachably ecured to the caing, a econd bearing tructure aociated with the driven haft, one of aid cover member including mean for upporting aid bearing tructure, aid other wall of the caing having upporting ur face for aid cover, aid cover having corre ponding dimenion, whereby the driving haft together with it aociated pulley tructure and ource of power may be interchanged in poition with the driven haft, together with it aoci ated pulley tructure and peed adjuting mech anim, with repect to aid caing. 10.