Cam Adjustment Mechanism for Compound Bow

Abstract

A cam adjustment mechanism is provided for both single and dual cam bows which enables excess cable length to be removed to re-sync the cams to restore performance of a bow which has experienced degradation due to unequal cable elongation. The cam adjustment mechanism can also be used to tune the bow to the archer's preferred characteristics.

I claim: 
     
         1 . Apparatus for adjusting a degree of cam rotation of a compound bow, the compound bow having a riser with a first upper limb and a second lower limb, said apparatus comprising cable tensioning means including
 a) first pulley means mounted upon a first end of the first upper limb of the compound bow, said first pulley means having a first peripheral groove for receiving a draw cable and a second peripheral groove for receiving a power cable;   b) second pulley means mounted upon a second opposite end of the second lower limb of the compound bow, said second pulley means having at least a first peripheral groove for receiving the draw cable;   c) adjustment means for engaging at least one of the draw cable and the power cable, said adjustment means being repositionable relative to said first and second pulley means to adjust an amount of tension in the engaged cable.   
     
     
         2 . The apparatus of  claim 1  wherein said first pulley means comprises a first and a second independently rotatable cam. 
     
     
         3 . The apparatus of  claim 1  wherein said second pulley means includes a second peripheral groove for receiving the power cable. 
     
     
         4 . The apparatus of  claim 3  wherein said second pulley means comprises a third and a fourth independently rotatable cam. 
     
     
         5 . The apparatus of  claim 1  wherein said adjustment means comprises at least one roller for engaging at least one of the power cable and the draw cable to alter the degree of rotation said pulley means of the engaged cable. 
     
     
         6 . The apparatus of  claim 5  wherein said adjustment means engages both of the power cable and the draw cable. 
     
     
         7 . The apparatus of  claim 6  wherein said adjustment means comprises two rollers, a first roller for engaging the power cable and a second roller for engaging the draw cable. 
     
     
         8 . The apparatus of  claim 7  wherein said second roller is independently adjustable from said first roller. 
     
     
         9 . The apparatus of  claim 8  wherein said first and said second roller are mounted on a common support arm. 
     
     
         10 . The apparatus of  claim 9  wherein said common support arm is pivotally mounted with respect to a riser of the bow and rotation of said support arm simultaneously adjusts both the power cable and the draw cable. 
     
     
         11 . The apparatus of  claim 1  wherein said adjustment means comprises first roller means and second roller means. 
     
     
         12 . The apparatus of  claim 11  wherein said first roller means comprise a first and second rollers engaging one of the power cable and the draw cable and said second roller means comprises a third roller diverting the same cable on an opposite side to deflect that cable between said first and second rollers to take up excess cable length. 
     
     
         13 . The apparatus of  claim 1  wherein said adjustment means slides along a rod, said rod being attached to the riser of the compound bow. 
     
     
         14 . The apparatus of  claim 1  wherein said adjustment means is secured to the compound bow solely by gripping the cable which it adjusts.