Abstract:
A cable assembly for rotating a member in response to a rotating input, including first and second pulley members and a conduit extending longitudinally and interconnecting the first and second pulley members. A pair of spaced strands extend longitudinally through the conduit and at least partially about the first and second pulley members. The first pulley member includes a slack adjustment mechanism for adjusting the slack in the strands.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates generally to cables, and more particularly to, a cable assembly for rotating a vane for directing air over an engine of a vehicle to control heater air. 
     2. Description of Related Art 
     Previously, a cable assembly such as a vent cable has been used to rotate a vane or flap to direct air over an engine of a vehicle for controlling air for the heater. Typically, these cables have used a single strand of wire in a conduit having an actuating mechanism which moves the strand of wire similar to conventional push-pull devices. 
     One disadvantage with the above cable assemblies is that the strand of wire is typically in a state of compression when pushed. That is undesired because the strand may bind or buckle. As a result, larger diameter strands of wire have to be used. Another disadvantage is that a push-pull operation is used which may be undesired. 
     SUMMARY OF THE INVENTION 
     It is, therefore, an object of the present invention to provide a new and improved cable assembly for heater control. 
     It is another object of the present invention to provide a cable assembly in which strands of wire are used in a state of tension only. 
     It is yet another object of the present invention to eliminate the operation of push-pull as used in conventional heater control cables. 
     To achieve the foregoing objects, the present invention is a cable assembly for rotating a member in response to a rotating input, including first and second pulley means and conduit means extending longitudinally and interconnecting the first and second pulley means. A strand means extends through the conduit means and at least partially about the first and second pulley means. The first pulley means includes slack adjustment means for adjusting the slack in the strand means. 
     One advantage of the present invention is that smaller diameter strands are used because the strands are used in tension only. Another advantage of the present invention is that the operation of push-pull is eliminated. Yet another advantage of the present invention is that torque and/or angular travel may be amplified or reduced by varying the size of the pulleys. A further advantage of the present invention is that the strands may have the slack taken up in several ways. A still further advantage of the present invention is that the cable assembly may be rotated freely. Yet another advantage of the present invention is that the direction of rotation of the pulleys may be easily changed from end to end. 
     Other objects, features, and advantages of the present invention will be readily appreciated as the same becomes better understood when viewed in light of the following description and accompanying drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view of a heater control arrangement incorporating a cable assembly according to the present invention. 
     FIG. 2 is a plan view of the cable assembly of FIG. 1. 
     FIG. 3 is a sectional view taken along line 3--3 of FIG. 2. 
     FIG. 4 is a plan view of an alternate embodiment of the cable assembly of FIG. 1. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to FIG. 1, a heater control arrangement 10 is shown. The heater control arrangement 10 includes a generally planar vane or flap 12 which is operatively connected by a support member 13 to one end of a cable assembly, generally indicated at 14, according to the present invention. The heater control arrangement 10 also includes a knob 16 operatively connected by a shaft member 17 which is connected to the other end of the cable assembly 14. The operation of the heater control arrangement 10 is such that when the knob 16 is rotated, the cable assembly 14 translates this rotational movement to rotate the vane 12 and direct air over an engine (not shown) of a vehicle (not shown) for controlling air for a heater (not shown). A more detailed description of the operation of the heater control arrangement 10 will be subsequently described. 
     Referring to FIGS. 2 and 3, the cable assembly 14 includes a first or large diameter pulley, generally indicated at 18, and a second or small diameter pulley, generally indicated at 20, interconnected by a longitudinally extending conduit 22. The large and small diameter pulleys 18 and 20 and conduit 22 are made from a plastic material. It should be appreciated that the pulley 18 has a diameter larger or greater than the pulley 20. It should also be appreciated that the diameter of the pulleys 18 and 20 could be equal or reversed. 
     The large diameter pulley 18 includes a first or large pulley member 24 having a pair of spaced and generally parallel circular flanges 26 and 28 of an enlarged diameter to form a notch or groove 30 therebetween of a smaller diameter. The large pulley member 24 has a generally concentric and circular aperture 32 extending diametrically therethrough. The aperture 32 includes four semi-circular radially extending recesses 34 similar to a &#34;four leaf clover&#34;. A bushing 36 is disposed within the aperture 32 and is generally circular in shape. The bushing 36 is made from a metallic material. The bushing 36 includes four corresponding semi-circular and radially extending projections 38 which are adapted to be received or disposed in the recesses 34 of the aperture 32. The bushing 36 includes a generally concentric and circular aperture 40 having a flat 42 extending therethrough. The aperture 40 is adapted to receive a corresponding circular end of the support member 13 having a flat 44 (FIG. 1) to mate with flat 42 such that rotation of the large pulley member 24 and bushing 36 will rotate the support member 13 and vane 12. 
     The large diameter pulley 18 also includes a generally circular housing 46. The housing 46 has an annular side wall 48 and a generally circular bottom wall 50 which form a cavity 52. The large pulley member 24 is disposed within the cavity 52. A generally circular and planar plate member 54 is disposed adjacent an outer surface 56 of the flange 26 of the large pulley member 24. The plate member 56 and large pulley member 24 are secured in the cavity 52 by a flange 58 at the free end of the side wall 48 which extends radially inwardly and has an inclined or beveled surface 60. It should be appreciated that the large pulley member 24 is sandwiched between the plate member 54 and bottom wall 50 such that the large pulley member 24 is free to rotate within the cavity 52. It should also be appreciated that the bottom wall 50, side wall 48 and flange 58 are preferably integral. 
     The plate member 54 and bottom wall 50 each include an aperture 62 and 64 extending therethrough and generally concentrically aligned with the aperture 40 of the bushing 36. The housing 46 also includes a generally circular and tubular extension 66 extending radially outwardly from the side wall 48. An aperture 68 extends through the housing 46 and communicates with the cavity 52 and an interior 69 of the tubular extension 66. One end of the conduit 22 is disposed within the interior 69 of the tubular extension 66. It should be appreciated that the conduit 22 is secured within the tubular extension 66. 
     The small diameter pulley 20 includes a small pulley member 70 having a pair of spaced and generally parallel circular flanges 72 and 74 of an enlarged diameter to form a notch or groove 76 therebetween of a smaller diameter. The small pulley member 70 has a generally concentric and circular aperture 78 extending diametrically therethrough. A bushing 80 is disposed within the aperture 78 and is generally circular in shape. The bushing 80 is made from a metallic material. The bushing 80 includes a generally concentric and circular aperture 82 which has a flat 84 extending therethrough. The aperture 82 is adapted to receive a corresponding circular end of the shaft member 17 having a flat 86 (FIG. 1) to mate with the flat 84 such that rotation of the knob 16 will rotate the bushing 80 and small pulley member 70. 
     The small pulley member 70 also includes a generally circular housing 88. The housing 88 has an annular side wall 90 and a generally circular bottom wall 92 which form a generally circular cavity 94. The small pulley member 70 is disposed within the cavity 94. A generally planar and circular plate member 96 is disposed adjacent the flange 72 of the small pulley member 70. The small pulley member 70 and plate member 96 are secured within the cavity 94 by a flange 98 at the free end of the side wall 90 which extends radially inwardly and has an inclined or beveled surface 99. It should be appreciated that the small pulley member 70 is sandwiched between the plate member 96 and bottom wall 92 such that the small pulley member 70 is free to rotate within the cavity 94. It should also be appreciated that the bottom wall 92, side wall 90 and flange 98 are preferably integral. It should further be appreciated that the small pulley member 70 has a diameter less than the large pulley member 24. 
     The plate member 96 and bottom wall 92 each include a generally circular aperture 100 and 102 extending therethrough and generally concentrically aligned with the aperture 82 of the bushing 80. The housing 88 also includes a generally circular and tubular extension 104 extending radially outwardly from the side wall 90. An aperture 106 extends through the housing 88 and communicates with the cavity 94 and an interior 107 of the tubular extension 104. The other end of the conduit 22 is adapted to be disposed within the interior 107 of the tubular extension 104. It should be appreciated that the conduit 22 is secured within the tubular extension 104. 
     The conduit 22 is generally circular in cross-sectional shape and extends longitudinally. The conduit 22 includes a pair of transversely spaced and longitudinally extending passageways 108 and 110 throughout the length thereof. A pair of strands 112 and 114 such as of metal wire are disposed within the passageways 108 and 110, respectively. The strand 112 extends through the passageway 108 and the groove 76 and partially about the small pulley member 70 to a U-shaped recess 116 thereof. The strand 114 extends through the passageway 110 and groove 76 and partially about the small pulley member 70 on the other side thereof to the U-shaped recess 116. Preferably, the strands 112 and 114 are one continuous strand. It should be appreciated that strands 112 and 114 could be two separate strands having their ends staked together and held in place by a metal cylindrical member 118 disposed in the U-shaped recess 116. In the preferred embodiment, the strands 112 and 114 are a continuous strand which extends through an aperture (not shown) in the cylindrical member 118 and compressed or pinched to secure the cylindrical member 118 to the strand. It should also be appreciated that the U-shaped recess 116 and cylindrical member 118 cooperate together to prevent the strands 112 and 114 from slipping or rotating relative to the small pulley member 70. The other end of the strands 112 and 114 extend through the corresponding passageways 108 and 110 and groove 30 and partially about the large pulley member 24. Each of the strands 112 and 114 extend into a slack adjustment mechanism, generally indicated at 120 in the large pulley member 24. The slack adjustment mechanism 120 takes up the slack or adjusts the tension in each of the strands 112 and 114. 
     The slack adjustment mechanism 120 includes a passageway 122 extending into a generally rectangular channel 124 in the large pulley member 24. The passageway 122 and channel 124 extend inwardly radially at an angle. The channel 124 includes a plurality of teeth 126 which are spaced by grooves 128. The teeth 126 are generally V-shaped and formed in a &#34;christmas tree&#34; pattern. A generally rectangular retainer member 130 has a pair of transversely spaced and longitudinally and outwardly extending tangs 132 which are adapted to engage the grooves 128 between the teeth 126. Each strand 112 and 114 extend through an aperture 134 in one end of the retainer member 130. A generally spherically shaped ball 136 is staked onto the end of each strand 112 and 114 to prevent the strand 112 and 114 from exiting or disengaging the aperture 134 and retainer member 130. A spring 138 is disposed about each strand 112 and 114 between one end of the retainer member 130 and one end of the channel 134. The spring 138 preloads or bias the retainer member 130 toward the opposite end of the channel 134. Preferably, only a portion 139 of the plate member 54 extends partially over the channel 124 to prevent the retainer member 130 from exiting vertically or axially outwardly from the channel 124 while allowing a tool to move the retainer member 130 along the channel 124. 
     Additionally, the small pulley member 70 may include a plurality of circumferentially spaced teeth 140 which cooperate with a post member 142 to produce a noise such as a &#34;click&#34;. It should be appreciated that this feature is optional. 
     In operation, the strands 112 and 114 are extended through the passageways 108 and 110 of the conduit 22. The strands 112 and 114 are guided in the groove 76 partially around the small pulley member 70. The strands 112 and 114 are secured to the cylindrical member 118 which is disposed in the U-shaped recess 116. The other end of the strands 112 and 114 are guided in groove 30 partially around the large pulley member 24 and into passageways 122. The springs 138 are disposed about the strands 112 and 114. The strands 112 and 114 are extended through aperture 134 in retainer member 130. The ball 136 is then staked to each end of the strands 112 and 114. 
     The retainer member 130 and spring 138 are disposed at the non-toothed end of the channel 124. A tool such as a screwdriver is used to move the retainer member 130 toward the opposite or toothed end of the channel 124. The tangs 132 are deflected inwardly as they contact the teeth 126 and extend or flex outwardly when disposed in the space 128 between the teeth 126. As the retainer member 130 moves along the channel 124, the slack in the strands 112 and 114 is taken up to extend the strands 112 and 114 and increase the tension in strands 112 and 114. When the strands 112 and 114 are taut, the tangs 132 engage the teeth 126 in the next available or adjacent space 128. 
     The cylindrical end of shaft member 17 is disposed in aperture 82 of the bushing 80 for the small pulley member 70. The cylindrical end of support member 13 is disposed in aperture 40 of bushing 36 for the large pulley member 24. The knob 16 may be rotated in either direction to rotate the small pulley member 70, which in turn, rotates the large pulley member 24 in the same direction, in turn, rotating vane 12. 
     Referring to FIG. 4, an alternate embodiment of the cable assembly 14 is shown. Like parts have like numerals increased by two hundred (200). The slack adjustment mechanism 320 of the large pulley member 224 includes a pair of transversely spaced and generally parallel arms 350 which are separated on each side by spaces 352 and 354 in the large pulley member 224. The arms 350 are generally T-shaped and are hinged at 356 to the remainder of the large pulley member 224. The free end 357 of the arms 350 and 352 include a channel 358 extending transversely therethrough. The strands 212 and 214 extend through the channels 358 and ball 336 is staked at one end thereof to prevent the strands from exiting or disengaging channels 358. Each arm 350 includes a plurality of teeth 326 spaced by grooves 328 on the outer free end thereof. A transversely extending spring member 360 has C-shaped ends 362 and is disposed in a groove 363 about an extension 364 of the large pulley member 324. The C-shaped ends 362 have an outwardly and inclined extending portion 366 which is adapted to engage a space 328 between the teeth 326. 
     The operation of the cable assembly 114 is similar to the cable assembly 14. For the slack adjustment mechanism 320, a tool such as a screwdriver is used to move the arms 350 toward each other such that the portion 366 contacts the teeth 326 and is deflected inwardly and extends or flexes outwardly in a space 328 as the arms 350 move toward each other, the slack in the strands 312 and 314 is taken up to extend the strands 312 and 314 and increase the tension in the strands 312 and 314. When the strands 312 and 314 are taut, the projections 366 engage the teeth 326 in the next available or adjacent space 329. 
     Accordingly, the torque or angular travel may be varied by changing the diameter of the pulleys. Also, the strands are in tension only, eliminating any push-pull operation or compression on the strands. Further, the slack in the strands may be taken up in several ways. 
     The present invention has been described in an illustrative manner. It is to be understood that the terminology which has been used is intended to be in the nature of words of description rather than of limitation. 
     Many modifications, variations of the present invention are possible in light of the above teaching. Therefore, within the scope of the appended claims, the present invention may be practiced otherwise and as specifically described.