SPRINGS Extension Springs Standard : N

Transcription

1 SR xtension Springs Standard : N W = Spring material width T = Spring material thickness L = Spring length (reference only) J = Minimum extension for constant force H = Off-set distance D2 = Storage drum diameter D1 = Outside diameter of spring when fully wound on storage drum W See Details of Spring nds J T D2 H D1 Recommended distance between drum flanges equals springs width (w)+1mm to 3mm SR1 SR2 SR3 SR4 SR5 SR6 SR7 SR8 SR9 SR10 SR11 SR12 SR13 SR14 SR15 SR16 SR17 SR18 SR19 SR20 SR21 SR22 SR23 SR24 SR25 SR26 N ±10% Spring: Type 301 High Yield Stainless Steel. Performance verage atigue Life: cycles. Kg ±10% xtension W T* L D2 D1 H J ,060 1,237 1,060 1,237 1,412 1,600 1,237 1,060 1,600 1,412 2,210 1,950 2, ,016 1,016 1,626 1,829 1,829 1,626 2,540 2, I/D* Spring Spring nds D D D G K K Price ach *Reference only, may be varied to meet load specification. See technical pages for Spring nd options. onstant force extension springs provide a huge range of application opportunities. Springs can be extended in excess of 50 times the relaxed length of the spring, and can be mounted on a bobbin or bush or free running in a cavity or recess. Springs can be joined or laminated to provide increased force with minimal increases in space requirements.

2 xtension Springs Standard : N SR W = Spring material width T = Spring material thickness L = Spring length (reference only) J = Minimum extension for constant force H = Off-set distance D2 = Storage drum diameter D1 = Outside diameter of spring when fully wound on storage drum W See Details of Spring nds J T D2 H D1 Recommended distance between drum flanges equals springs width (w)+1mm to 3mm SR27 SR28 SR29 SR30 SR31 SR32 SR33 SR34 SR35 SR36 SR37 SR38 SR39 SR40 SR41 SR42 SR43 SR44 SR45 SR46 SR47 SR48 SR49 SR50 SR51 SR52 N ±10% Spring: Type 301 High Yield Stainless Steel. Performance verage atigue Life: cycles. Kg ±10% xtension W T* L D2 D1 H J ,011 1,179 1,011 1,179 1,340 1,516 1,179 1,011 1,516 1,340 2,103 1,852 2, ,016 1,016 1,626 1,829 1,829 1,626 2,540 2, *Reference only, may be varied to meet load specification. See technical pages for Spring nd options. I/D* Spring Spring nds D D D G K K Price ach onstant force extension springs provide a huge range of application opportunities. Springs can be extended in excess of 50 times the relaxed length of the spring, and can be mounted on a bobbin or bush or free running in a cavity or recess. Springs can be joined or laminated to provide increased force with minimal increases in space requirements.

3 SR xtension Springs Standard : N W = Spring material width T = Spring material thickness L = Spring length (reference only) J = Minimum extension for constant force H = Off-set distance D2 = Storage drum diameter D1 = Outside diameter of spring when fully wound on storage drum W See Details of Spring nds J T D2 H D1 Recommended distance between drum flanges equals springs width (w)+1mm to 3mm SR53 SR54 SR55 SR56 SR57 SR58 SR59 SR60 SR61 SR62 SR63 SR64 SR65 SR66 SR67 SR68 SR69 SR70 SR71 SR72 SR73 SR74 SR75 SR76 SR77 SR78 N ±10% Spring: Type 301 High Yield Stainless Steel. Performance verage atigue Life: cycles. I/D* Spring Price ach Kg ±10% xtension W T* L D2 D1 H J Spring nds D D D , , , , , , , , , , , , , , , G , K , , K *Reference only, may be varied to meet load specification. See technical pages for Spring nd options. onstant force extension springs provide a huge range of application opportunities. Springs can be extended in excess of 50 times the relaxed length of the spring, and can be mounted on a bobbin or bush or free running in a cavity or recess. Springs can be joined or laminated to provide increased force with minimal increases in space requirements.

4 S xtension Spring ssemblies Single : N Dia Dia B Min. contraction for constant force S242 S243 S244 S245 S246 S247 S248 S249 S250 S251 S252 S253 S254 S255 S256 N±10% Kg±10% xtension B ,118 1,321 1,118 1,321 1,321 1,930 Spring: Type 301 High Yield Stainless Steel. Other s: Pressed Mild Steel, Zinc Plate and clear passivated. Performance Max. Operating Temperature: Not recommended for use in temperatures in excess verage atigue Life ycles Spring Ref. Used In Price ach ssembly* SR SR SR SR SR SR SR SR SR SR SR SR SR SR SR26 * Spring specifications do not necessarily conform to chart values when used in these assemblies onstant force extension springs provide a huge range of application opportunities. Springs can be extended in excess of 50 times the relaxed length of the spring, and can be mounted on a bobbin or bush or free running in a cavity or recess. Springs can be joined or laminated to provide increased force with minimal increases in space requirements.

5 S xtension Spring ssemblies Twin : N Dia. S257 S258 S259 S260 S261 S262 S263 S264 S265 S266 S267 S268 S269 S270 S271 N±10% B Dia. Min. contraction for constant force Kg±10% xtension B 915 1,118 1,321 1,118 1,321 1,321 1,930 Spring: Type 301 High Yield Stainless Steel. Other s: Pressed Mild Steel, Zinc Plate and clear passivated. Performance Max. Operating Temperature: Not recommended for use in temperatures in excess verage atigue Life ycles Spring Ref. Used In Price ach ssembly* SR SR SR SR SR SR SR SR SR SR SR SR SR SR SR26 * Spring specifications do not necessarily conform to chart values when used in these assemblies onstant force extension springs provide a huge range of application opportunities. Springs can be extended in excess of 50 times the relaxed length of the spring, and can be mounted on a bobbin or bush or free running in a cavity or recess. Springs can be joined or laminated to provide increased force with minimal increases in space requirements.

6 BBSR xtension Spring ssemblies Standard Bobbin & Bracket : N Min. contraction for constant force Dia (4) 2 B Screws W W+6.35 W W W Dia. BBSR64 BBSR65 BBSR38 BBSR39 BBSR40 BBSR41 BBSR42 BBSR14 BBSR43 BBSR15 BBSR46 BBSR17 BBSR47 BBSR18 BBSR19 BBSR20 BBSR21 BBSR22 BBSR23 N±10% Kg±10% xtension W T L verage atigue Life ycles Spring nds ,020 1,170 1,020 1,040 1,170 1,220 1,170 1,220 1,020 1,400 1,600 1,220 1,040 1,600 1, ,016 1,016 1,016 1,015 1,626 1,829 1,829 1,626 Price ach * The reference following the prefix BB indicates the spring used in this assembly. Spring specifications do not necessarily conform to chart values when used in these assemblies See technical pages for Spring nd options. Spring: Stainless Steel 301 S21 Grade. Bobbin & Bracket: Nylon moulded bobbin, secured to sheet luminium base. onstant force extension springs provide a huge range of application opportunities. Springs can be extended in excess of 50 times the relaxed length of the spring, and can be mounted on a bobbin or bush or free running in a cavity or recess. Springs can be joined or laminated to provide increased force with minimal increases in space requirements.

7 S xtension Spring ssemblies Small Bobbin & Bracket : N 3.97 Dia Dia S275 S276 S277 S278 Kg ±10% Spring: Stainless Steel 301 S21 Grade. Base: luminium. Drum: High Impact Styrine. xtension verage atigue Life ycles 3 Spring Ref. Used In ssembly* SR6 SR7 SR32 N2592 Price ach * Spring specifications do not necessarily conform to chart values when used in these assemblies onstant force extension springs provide a huge range of application opportunities. Springs can be extended in excess of 50 times the relaxed length of the spring, and can be mounted on a bobbin or bush or free running in a cavity or recess. Springs can be joined or laminated to provide increased force with minimal increases in space requirements.

8 xtension Springs & ssemblies actors ffecting Design SR, S & BBSR atigue Life The fatigue life has a direct effect on the size of the spring and the maximum load available in the least space. comparison of various chart values illustrates the effect fatigue requirements have on the size of the spring. or any application the required number of cycles or reversals, should be estimated for the life of the equipment or a replacement schedule. The fatigue life of a spring can be defined as either a full or partial extraction and retraction of the spring i.e. the spring can be exercised over its whole length and achieve the average life expectation, however if it is exercised over any one section of the spring repeatedly then that section can be expected to fatigue when the total number of cycles approaches the life predicted for the spring. atigue life is not time dependant under normal operating circumstances, it is solely dependant on the number of operations. However, pollutants even in low concentrations can have the effect of shortening the fatigue life through corrosion or chemical attack. Please refer to our Technical Department for further details. xtension Spring used in conjunction with Idler Pulley Ondrives springs can be used with an idler pulley provided it is positioned to suit the natural curvature of the spring (see diagram). xtension springs should not normally be bent back or reverse wound, as this will permanently damage the spring. ORRT INORRT Speed and cceleration There is almost no limit to the speed or acceleration to which the spring will coil and uncoil. However, tests should be carried out to satisfy yourself the spring will perform satisfactorily under your conditions. Stability Held flat The free end of the extension spring should be guided to prevent the spring from wandering off the drum. The spring should be firmly attached to the moveable member (see diagrams). Types of Mounting - Drum Mounting The spring will be held on the drum by its inherent gripping action. No other fixing is required, provided there is sufficient spring material remaining on the drum when fully extended. n exception to this is when the mechanism does not have its own limiting stops, in which case we recommend the inner end be secured to the drum by the holes provided (drum should be stepped - see below). or T H N I L

9 xtension Springs & ssemblies actors ffecting Design & Spring nds SR, S & BBSR T H N I L avity Mounting low cost mounting arrangement is the Ondrives spring coil seated in a cavity, the obvious disadvantage is the friction between the spring coil and the cavity surface. We would recommend the cavity to be lined with a low friction material. nother method is to use the free coil force against a movable member. Multiple Mounting Various standard methods of multiple mounting are shown below. Springs can also be laminated to provide an increase in force or fatigue life in a minimum space. To discuss your needs please call our technical department who will be pleased to help. xtension Spring nds Ø3.97 Ø R9.52 R15.88 Ø Ø J V (2) Ø (2) Ø5.55 (2) Ø Ø5.16 Ø3.17 B 11.1 D K Ø6.74 Ø G T W X Y H U

10 B Motor Spring ssemblies Open (4) 3.97 Dia nd itting Spring Hook B271-S B272-S B273-S B274-S pprox. ounter-balances Kg of revolutions verage atigue Life ycles Travel ,000 13,000 30, Spring: 301 Stainless Steel. Base: luminium. Drums: High Impact Styrine. ord: Nylon Monofilament. Spring Ref. Used In ssembly* Price ach B B B B4 * Spring specifications do not necessarily conform to chart values when used in these assemblies ontstructed from a specially stressed constant force spring, motor springs provide high amounts of torque in a small package. These springs provide rotational energy from the torque output drum (D3), or linear motion with the use of a pulley, cable, or webbing.

11 SR Motor Springs Standard : N W = Spring material width T = Spring material thickness L = Spring length (reference only) = Distance between drum centres (min) D2 = Storage drum diameter D3 = Torque drum diameter D1 = Outside diameter of spring when fully wound on storage drum D4 = Outside diameter of spring when fully wound on torque drum Torque Output Drum Min. W See Details of Spring nds (min*) D3 T *May be increased D4 D2 D1 Storage Drum Recommended distance between drum flanges equals springs width (W +1 to 3mm) SR79 SR80 SR81 SR82 SR83 SR84 SR85 SR86 SR87 SR88 SR89 SR90 SR91 SR92 SR93 SR94 SR95 SR96 SR97 SR98 SR99 Torque N ±10% Spring: Type 301 High Yield Stainless Steel. Performance verage atigue Life: cycles, 27 working turns. Torque Kg cms ±10% W T* L D2 D3 D1 D I/D* Spring Price ach Spring nds 1-9 1, , , , , , D , , , , , , , , , , , , , , K , K *Reference only, may be varied to meet load specification. See technical pages for Spring nd options. ontstructed from a specially stressed constant force spring, motor springs provide high amounts of torque in a small package. These springs provide rotational energy from the torque output drum (D3), or linear motion with the use of a pulley, cable, or webbing.

12 Motor Springs Standard : N SR W = Spring material width T = Spring material thickness L = Spring length (reference only) = Distance between drum centres (min) D2 = Storage drum diameter D3 = Torque drum diameter D1 = Outside diameter of spring when fully wound on storage drum D4 = Outside diameter of spring when fully wound on torque drum Torque Output Drum Min. W See Details of Spring nds (min*) D3 T *May be increased D4 D2 D1 Storage Drum Recommended distance between drum flanges equals springs width (W +1 to 3mm) SR100 SR101 SR102 SR103 SR104 SR105 SR106 SR107 SR108 SR109 SR110 SR111 SR112 SR113 SR114 SR115 SR116 SR117 SR118 SR119 SR120 Torque N ±10% Torque Kg cms ±10% W T* L D2 D3 D1 D Spring: Type 301 High Yield Stainless Steel. Performance verage atigue Life: 20,000 cycles, 20 working turns. I/D* Spring Price ach Spring nds 1-9 1, , , , , , D , , , , , , , , , , , , , , K , K *Reference only, may be varied to meet load specification. See technical pages for Spring nd options. ontstructed from a specially stressed constant force spring, motor springs provide high amounts of torque in a small package. These springs provide rotational energy from the torque output drum (D3), or linear motion with the use of a pulley, cable, or webbing.

13 Motor Springs and ssemblies SR & B T H N I L atigue Life The fatigue life has a direct effect on the size of the spring and the maximum torque output available in the least space. comparison of various chart values illustrates the effect fatigue requirements have on the size of the spring. or any application, the required number of cycles or reversals should be estimated for the life of the equipment or a replacement schedule. The fatigue life of a spring can be defined as either a full or partial extraction and retraction of the spring i.e. the spring can be exercised over its whole length and achieve the average life expectation. However, if it is exercised over any one section of the spring repeatedly, then that section can be expected to fatigue when the total number of cycles approaches the life predicted for the spring. atigue life is not time dependant under normal operating circumstances, it is solely dependant on the number of operations. However pollutants even in low concentrations can have the effect of shortening the fatigue life through corrosion or chemical attack. Please refer to our Technical Department for further details. Mounting Details spring motor consists of the following, torque output drum, spring and a storage drum. The storage drum is the smaller of the two and is of a specified diameter. The spring will grip the storage drum by its own inherent gripping action. The torque output drum is the larger of the two and is also of a specified diameter. The spring must be attached to the drum in such a way that succeeding turns of the spring will not be raised by any protrusions, (see diagrams). Both drums are usually supplied by the user according to the requirements of his own application. How the spring is assembled on drum (not supplied) Outer end of spring to be first wrap on storage drum. The free end is then fastened to the torque output drum so that its curvature will be reversed. nd B nd Working Turns The principal limitation on the total number of rotations of a spring motor is the space requirement of the amount of material involved. ully Wound Position B Un-wound Position

14 Motor Springs and ssemblies SR & B Speed and cceleration ree release of a charged spring motor, or any condition approaching free release, may permit the torque drum to throw off material faster than the storage drum can coil up. No such limitation exists in the pull-out or charging part of the cycle, except for sudden decelerations. Wherever high-speed operation, sudden stopping or release are predictable service conditions, experimental models should be employed to verify performance. Stop Mechanisms If the driven mechanism does not have its own limits, some stops or restraints should be included in the design of the spring motor assembly to prevent over-travel of the spring. In some applications the travel of the motor assembly must be limited itself. The illustration shows a double stop mechanism with the motor in both the wound and unwound positions. More often an automatic stop is required only at the end of the power stroke, in which case the device shown would be used only on the output drum. Motor Spring nds Ø3.97 Ø R9.52 R15.88 Ø Ø J (2) Ø (2) Ø5.55 (2) Ø Ø5.16 Ø3.17 B 11.1 D K Ø6.74 Ø G H T H N I L