Light Duty Push-Pull and Turn-to-Lock Controls

Transcription

1 ight Duty Push-Pull and Turn-to-ock Controls

2 Push-Pull Controls Creative solutions for every application Outdoor Power Equipment Construction Equipment Utility Vehicles ZTR s Recreational Equipment Tillers Snow Products Consumer and Commercial Garden Equipment Garden Tractors ATV s Marine Medical Off-Road Vehicles Numerous creative methods of applying Push-Pull Controls, Rotational or Non-Rotational, Turn-to-ock or Non- ocking in any number of creative applications using a variety of mounting options. Applications: Choke Controls Throttle Controls HVAC Controls Hood Release Controls Vent Control 2

3 Push-Pull Controls INDEX General Design Information...4 Push-Pull Controls...5 Push Button Controls...9 Turn-to-ock Controls...0 Knobs and Brands... Conduit Clips...3 Seals and Wipers...4 Innerwire End Bends...5 3

4 General Design Information Solid Innerwire Selection Factors/Design Practices Effi cient, economical transmission of linear motion is provided by push-pull conduit and innerwire assemblies. They transmit motion between two fi xed points or between points which are changing their relative position. These controls can be routed up, down, over obstacles, even around corners, without intermediate links or pulleys. Typical applications range from throttle and choke controls for outdoor power equipment to automotive vent and hood controls. Unlike tension cables, these controls can transmit motion in both the push and pull directions. However to fully utilize this capability, these controls must be properly integrated into the complete design of the product. The following describes the various types of Controls, discusses their advantages and limitations and the design practices necessary to obtain effi cient motion transfer. Input or Output Form Basically, all push-pull controls, transmit motion by linear displacement of a solid innerwire relative to fi xed, fl exible conduit (Figure ). Construction Conduit A simple control composed of innerwire and spirally wrapped wire conduit is shown in Figure 2. oad Capacities Force transmitting capacity is proportional to the diameter of the innerwire, the size of the conduit and the innerwire extension. Maximum recommended push loads are usually about 50 percent of the maximum recommended pull loads. Service ife Even through the innerwire is continuously fl exed during operation, the loads in a properly selected innerwire are low enough that the fatigue failure is not normally a problem Bend Radii Figure 2 Bends in the conduit must be of suffi cient radii to permit the innerwire to fl ow smoothly without acquiring a permanent set. Minimum recommended radii may vary from 5 to 9 inches, depending upon innerwire diameter and construction. Solid Innerwire Figure In general, control cost is a function of capacity and performance capabilities. The ideal control is one which meets, but does not necessarily exceed, performance demands. Minimum bend radii necessary to prevent the innerwire from taking a permanent set are proportional to innerwire diameter. Therefore, the load capacity advantage of the larger innerwire is counter balanced. In many installations, by the diffi culties of providing adequate bend radii. Bends with radii smaller than the recommended minimum values will produce excessive friction and reduce service life. As a rule of thumb, fi gure minimum bend radius by multiplying innerwire diameter by 00. Example: For.062 diameter innerwire, multiply.062 by 00 to obtain a 6 inch bend radius. Normally, load capacity decreases as the travel range increases. The innerwire provides angular motion by simple defl ection of the exposed portion of the innerwire. This defl ection should normally be limited to 5 degrees either side of the normal straight position. 4

5 General Design Information Solid Innerwire Selection Factors/Design Practices ost Motion The difference between input and output movement, Figure, is often the most troublesome factor in control applications. However, if minimum lost motion is an essential performance requirement, it can be provided by proper application techniques. ost motion can result both from innerwire defl ection and backlash. The clearance necessary between innerwire and conduit permits lost motion.. Deflection - Defl ection loss results from snaking of the innerwire under compression loads. Snaking depends primarily upon the amount and uniformity of clearance between the innerwire and the conduit. A minimum uniform clearance permits the minimum snaking of column-action buckling of the innerwire when it is under compression loads. 2. Backlash (or lost motion) - is caused by clearance between the core diameter and the inside diameter of the conduit. It is present in both the push and pull modes of operation. Backlash is directly proportional to the total degrees of bend in the installed routing and the clearance between the O.D. of the core and the I.D. of the conduit. Friction Installed Position R R2 Installed Position Figure Compression oad Tension oad Backlash R = Centerline of core in tension (Working oad) R2 = Centerline of core in compression (Working oad) Even if an innerwire appears to be perfectly straight, there will be a nominal friction loss. Control specifi cations usually include the necessary data to determine friction loss as a function of the total curvature of the conduit. Design Procedure. Determine a. Maximum load in each direction required at output end. b. Permissible lost motion. c. Travel required. d. Range of operating temperatures. e. Other unfavorable conditions such as dust, dirt, moisture, chemical corrosion, etc. 2. Use as few bends as possible and keep bendradii as large as possible. 3. Provide positive location points for each end of the conduit. Total length of the conduit assembly can now be estimated. 4. Determine the proposed installation, duplicating and relative location of the input and output ends, the load required at the output end, as well as the proposed routing and clamping arrangement. 5. Exact innerwire length can be determined now. It should be just enough to provide adequate length when all the manufacturing tolerances of the machine components are combined to produce the maximum overall length. Excess innerwire length necessitates extra bends, which add to the lost motion and friction load. Operating Environment To obtain satisfactory service life, the operating environment must be considered. For example, dust, moisture, heat, chemical corrosion and mechanical damage can lead to premature control failure. Dust and moisture damage can be controlled by using a lined and or covered conduit. For excessively dusty conditions, a wiper seal may be required. Chemical corrosion and heat damage are usually controlled by the choice of materials. Plastic covered conduit is often used to provide the maximum corrosion protection. Mechanical damage may occur during regular use of the equipment or during overhaul or repair. The conduit should be routed so that it is protected by the basic machine structure, or if this is not practical, additional mechanical protection should be provided in areas of likely damage. 5

6 Push-Pull Controls -022 Rotational Travels:.00 (Confi g. 454) 2.00 (Confi g. 4067) 4.00 (Confi g. 4204) Upper Seal Option.50 ower Seal Optional (See Page 3) 3/8-24 Thread (.2) NOTE: Installation Hole Size =.406 Dia. B. No End Bend ± ± ± ± ± Hex.87 Dia. Conduit * Knobs: 30-00, 30-07, , w/optional Brand (See Pages & 2) (.2).062 Dia. Innerwire * -079 Rotational/ Non-Rotational Travel: 2.00 (Confi g. 4085) Upper Seal Option.50 ower Seal Optional (See Page 3) 3/8-24 Thread (.2) B. No End Bend ± ± ± ± ± Hex.87 Dia. Conduit * Knobs: 30-00, 30-07, w/optional Brand (See Pages & 2) Dia (.2).062 Dia. Innerwire * -082 Rotational Travel: 2.00 (Confi g. 047).75 (Confi g. 542).543 9/6-8Thread B. No End Bend ± ± ± ± ± Dia. Conduit *.062 Dia. Innerwire * Knobs: 30-00, 30-07, , w/optional Brand (See Pages & 2) Dia Non-Rotational Travel: 2.00 (Confi g. 55).75 (Confi g. 26).543 9/6-8 Thread (.2) B. No End Bend ± ± ± ± ± Dia. Conduit *.062 Dia. Innerwire * Knobs: 30-00, 30-07, , w/optional Brand (See Pages & 2) Dia (.2) 6

7 Push-Pull Controls -096 Rotational NOTE: Installation Hole Size =.328 Dia. 5/6-24 Thread B. No End Bend ±.8 Knob Threaded onto Rod.87 Dia. Covered Conduit * Knob w/optional Brand (See Page ).062 Dia. Innerwire * ± ± ± ± Rotating, Rear Mount Threaded, 6mm Travel Capacity:.50 B. No End Bend ±.8 Wiper Available (.2) M6 x 2-6g (.4) (2.50).87 Dia. Covered Conduit * (.2).062 Dia. Innerwire *.550± ±.005 Dia ± ± ± ± Non-Rotational B. No End Bend ±.8.87 Dia. Covered Conduit *.062 Dia. Innerwire *.2 Dia (3.07) ± ± ± ±.50 7

8 -200 Rotating, Snap-In, Non-Friction Travel Capacity: 2.00 Push-Pull Controls B. No End Bend ± Knob with molded-in choke artwork Additional knobs , & with optional brand artwork (See Pages & 2) (3.38) (.2) (.2).87 Dia. Covered Conduit *.062 Dia. Innerwire * Sq. (Panel Thickness.25/.30) ± ± ± ± Rotating, Snap-N-Seal Snap in Panel Travel Capacity: 2.00 B. No End Bend ±.8 Brand Options (See Page ) (3.38) (.2).87 Dia. Covered Conduit *.062 Dia. Innerwire * (.2) Sq. (Panel Thickness.25/.30) ± ± ± ± Rotating, Snap-N-Seal NOTE: Installation Hole Size =.4 Dia. Travel Capacity: 2.00 B. No End Bend ±.8 Brand Options (See Page ) (3.38) (.2) 3/8-24 (.2).87 Dia. Covered Conduit *.062 Dia. Innerwire * ± ± ± ±.50 8

9 / Tension ock Type Controls Push Button Release ocks in any position against tension. Max locking force = 50 bs. Travels: Travel Travel NOTE: Installation Hole Size =.4 Dia. Push Button Controls ± ± ± ± Dia. Double Wound Conduit Bare or Covered 2/Black HDPE.062 Dia. S.S. Innerwire Aluminum 3/8-24 Thread Tube.87 Dia Dia.50 (.75 Travel) 2.2 (2.75 Travel).38 ( ) = 6.50 ( ) = ± Dual Control Travel: 2.75 NOTE: Installation Hole Size.4 Dia ± ± ± ±.50 Aluminum 3/8-24 Thread Tube (Typ) ±.25 (Typ) (.87 Dia.).00 Dia..25 (2.2).87 Dia. Conduit *.062 Dia. Innerwire * Travel (.38) (6.50) 9

10 Turn-to-ock Controls -00 Turn-To-ock Travel: 2.00 or 4.00 B. No End Bend ± /6-8 Thread (.2) Knob w/optional Brand (See Page 2) (See Chart) (See Chart) (.2) Conduit Size Wire Size.87 Dia..062 Dia. 7/32 Dia..072 Dia. /4 Dia..080 Dia Dia ± ± ± ± Turn-To-ock Travels: B. No End Bend ±.8.59 (.2) 9/6-8 Thread Knob w/optional Brand (See Page 2) *.87 Dia. Conduit *.062 Dia. Innerwire (.2) Dia ± ± ± ±.50 0

11 Knobs & Brands Round Knob * Brands for Knob.88 Dia..72 STOP PUSH TO CHOKE Dia. CHOKE -05 (Throttle) (Choke) Round Knob * Brands for Knob.87 TUR N T O O CK OCK OC K O CK.25 Dia..4 Dia PU TO STOP STOP DUMP PU RAM RAISE ANGE ETHER START PU FOR MAX. COOING PRIMER PU TO CHOKE CHOKE (Throttle) PU TO STOP ENGINE SHUT OFF THROTTE OPEN COSE EMER. STOP PARK REEASE (Choke) Soft Touch Knob Contact Your Wescon Application Engineer for Custom Branding Tee (Flat Top) May Be Installed on ever or Rod Contact Your Wescon Application Engineer for Custom Branding Dia..2 Dia..48 Dia..75 Soft Textured Vinyl

12 Knobs & Brands T-Handle Knob * Brands for Knob Dia Dia. R OCK T-Handle Knob * Brands for Knob Dia. TURN OCK TO P U S T A R T HYDRO IFT T * T-Handle Knob Color (Black is Standard) * Brands for Knob Dia. Core Type T THROTTE CHOKE S T O P S H U T O F F O P E N C O S E EMER. STOP HOOD P U H O O D U P

13 Conduit Clips * Conduit Clip Part No. Conduit Size Mounting Hole A B Finish -0 3/6 Cov. or 7/32 Bare.200 Dia Hole Bright -05 3/6 Cov. or 7/32 Bare.263 Dia Hole Bright -07 3/6 Cov. or 7/32 Bare.227 Dia Hole Bright -24 3/6 Cov. or 7/32 Bare No Hole Bright -3 3/6 Cov. or 7/32 Bare.27 x.39 Slot Yellow -38 3/6 Cov. or 7/32 Bare.263 Dia Hole Black -39 3/6 Cov. or 7/32 Bare.27 x.39 Slot Black Bare.263 Dia Hole Bright (.50) Mounting Hole A B * Conduit Clip - Anti-Rotational Part No. Conduit Size Mounting Hole A B C D Finish -5 3/6 Cov. or 7/32 Bare.2 x.34 Slot Bright -8 3/6 Cov. or 7/32 Bare.2 x.34 Slot Yellow -40 7/32 Cov. or /4 Bare.9 x.26 Slot Yellow Covered.26 Dia Hole Yellow * oose String-On Clip Usage: 3/6 Dia Covered, 7/32 Bare Conduit & 6 Wire Finish: Black (.50) Mounting Hole A Part No. Mounting Hole A Dia Hole x.27 Slot A B C D Mounting Hole * Conduit Clip A Dia Part No. Conduit Size A Finish -00 3/6 Bare.22 Yellow -02 7/32 Bare.28 Clear -03 /4 Bare.28 Clear -04 3/6 Bare.28 Clear -05 7/32 Bare.22 Clear - 7/32 Bare or 3/6 Covered.28 Clear -2 3/6 Bare.28 Clear.50 Installed Position Dual Conduit Clamp Material: Steel Finish: Zinc Plate Usage: 3/6 or 7/32 Dia Conduit.25 Dia Single Conduit Clamp Material: Steel Finish: Zinc Cobalt Usage: 3/6 or 7/32 Dia Conduit.20 Dia

14 Seals & Wipers * Cable Seal * Insert Dash No. Dash No. Cable Size A Color A Dia -0 3/64 & /6.056 Black -02 3/ Black -03 5/ Black -04 3/32 & /6.056 Grey Dia Grommet For.062 Dia Solid Wire, 7/32 Dia Covered or /4 Dia Bare Conduit Grommet For.062 Dia Cable w/ Fitting.059 Dia.05 Dia.44 Dia.37 Dia * Boot * Insert Dash No. Dash No. A B C Color /8 5/32 Black /2 3/32 Red /2 3/32 Black /2 /6 Black /2.200 Black /8.55 Red A Dia B C Dia * Seal * Insert Dash No For 3/6 Bare Conduit Used in Temperatures Up to 300 F Applications Dash No. A Color Grey Black Black.44 A Dia.30 Dia Dia.28 Dia * Grommet * Insert Dash No. Dash No. Conduit Color /6 Cov. or 7/32 Bare Black Bare Grey Dia.30 Dia 4

15 Innerwire End Bends Z Bend Standard Bend Confi guration - Will be furnished unless otherwise specifi ed. Bend No. X Y Bend No. X Y Bend No. X Y Y ± X ± Bend Bend No. X Bend No. X X ± Centered oop Bend No. I.D. Number of Coils / Bend No. I.D. Number of Coils / / /2 Number of Coils ±.25 I.D

16 TAKE A OOK AT OTHER WESCON PRODUCTS ight Duty ever Controls Outdoor Power Equipment Controls Accessories ight Duty Tension Cable Controls PAT. 7,607, R2 WESCON CONTROS P.O. Box 770 Wichita, Kansas or call toll free Fax ISO 900 CERTIFIED