Two-track system for dual cam compound bow

Abstract

The present invention comprises a two-track cam assembly wherein the cam assembly has a bowstring component for housing the bowstring and a power cable component that allows for the take up and let out of the power cable on opposing ends of the power cable component, effectively creating a two-track cam assembly. The efficiency rating of the device achieves 95.8%. The cam assembly can come in a unitary or modular form and further each component (i.e. the bowstring or power cable component) can be in a circular or non-circular form.

1 . A compound bow comprising:
 a handle portion;   an upper limb portion having at least one upper cam assembly rotatably mounted thereon;   a lower limb portion having at least one lower cam assembly rotatably mounted thereon   said upper cam assembly comprising:   a bowstring cam component having a track for receiving a bowstring;   a power cable cam component having a take up portion and a let out portion; said take up portion having a track for receiving a power cable; said let out portion having a track for receiving a power cable; the tracks for the take up portion and let out portion being substantially coplanar.   
   
   
       2 . The compound bow of  claim 1  wherein said lower cam assembly comprises:
 a bowstring cam component having a track for receiving a bowstring;   a power cable cam component having a take up portion and a let out portion; said take up portion having a track for receiving a power cable; said let out portion having a track for receiving a power cable; the tracks for the take up portion and let out portion being substantially coplanar.   
   
   
       3 . The compound bow of  claim 2  further comprising:
 a first power cable having a first and second end;   a second power cable having a first and second end; and   a bowstring;   wherein said first power cable is anchored to said upper cam assembly with a portion adjacent to the first end of said first power cable received in the track of said take up portion of said power cable cam component on said upper cam assembly and the second end is anchored to said lower cam assembly with a portion adjacent to the second end of said first power cable received in the track of said let out portion of said power cable cam component on the lower cam assembly;   wherein said second power cable is anchored to said upper cam assembly with a portion adjacent to the first end of said second power cable received in the track of said let out portion of said power cable cam component on said upper cam assembly and the second end is anchored to said lower cam assembly with a portion adjacent to the second end of said second power cable received in the track of said take up portion of said power cable cam component on the lower cam assembly;   such that the first end of said first power cable and the first end of said second power cable are coplanar; and the second end of said first power cable and the second end of said second power cable are coplanar.   
   
   
       4 . The compound bow of  claim 2  wherein the tracks on said take up portion and said let out portion of said power cable cam component of said upper cam assembly are a continuous track around at least a portion on the periphery of said power cable cam assembly. 
   
   
       5 . The compound bow of  claim 5  wherein the tracks on said take up portion and said let out portion of said power cable cam component of said lower cam assembly are a continuous track around at least a portion on the periphery of said power cable cam assembly 
   
   
       6 . The compound bow of  claim 1  wherein the tracks on said take up portion and said let out portion of the power cable cam component are distinct, non-continuous tracks on the periphery of said power cable cam assembly. 
   
   
       7 . The compound bow of  claim 1  wherein said let out portion of said power cable cam component of said upper cam assembly is a modular unit. 
   
   
       8 . The compound bow of  claim 7  wherein said let out portion is attached to said power cable cam component of said upper cam assembly. 
   
   
       9 . The compound bow of  claim 2  wherein said let out portion of said power cable cam component of said lower cam assembly is a modular unit. 
   
   
       10 . The compound bow of  claim 9  wherein said let out portion is attached to said power cable cam component of said lower cam assembly. 
   
   
       11 . The compound bow of  claim 1  wherein said upper cam assembly further comprises a draw stop pin. 
   
   
       12 . The compound bow of  claim 11  wherein said draw stop pin is attached to said let out portion of said power cable cam component. 
   
   
       13 . A compound bow comprising:
 a handle portion;   a first power cable having a first and second end;   a second power cable having a first and second end;   a bowstring;   an upper limb portion having at least one upper cam assembly rotatably mounted thereon;   a lower limb portion having at least one lower cam assembly rotatably mounted thereon   said upper cam assembly comprising:
 a bowstring cam component having a track for receiving a bowstring; 
 a power cable cam component having a take up portion and a let out portion; 
 a take up terminating post; and 
 a let out terminating post; 
   said take up portion having a track for receiving a power cable; said let out portion having a track for receiving a power cable; the tracks for the take up portion and let out portion being substantially coplanar.   
     said lower cam assembly comprises:
 a bowstring cam component having a track for receiving a bowstring; 
 a power cable cam component having a take up portion and a let out portion; 
 a tale up terminating post; and 
 a let out terminating post; 
 said take up portion having a track for receiving a power cable; said let out portion having a track for receiving a power cable; the tracks for the take up portion and let out portion being substantially coplanar. 
 wherein the first end of said first power cable is attached to said take up terminating post and wrapped around said take up portion of said power cable cam component on said upper cam assembly and the second end of said first power cable is attached to said let out terminating post and wrapped around the let out portion of said power cable cam component of said lower cam assembly; 
 wherein the first end of said second power cable is attached to said let out terminating post and wrapped around said let out portion of said power cable cam component on said upper cam assembly and the second end of said second power cable is attached to said take up terminating post and wrapped around the take up portion of said power cable cam component of said lower cam assembly; 
 such that the tracks in said take up portion and let out portion of said power cable cam component of said upper cam assembly are substantially coplanar. 
 
   
   
       14 . The compound bow of  claim 13  wherein the tracks on said take up portion and said let out portion of said power cable cam component of said upper cam assembly are a continuous track around at least a portion on the periphery of said power cable cam assembly. 
   
   
       15 . The compound bow of  claim 13  wherein the tracks on said take up portion and said let out portion of said power cable cam component of said lower cam assembly are a continuous track around at least a portion on the periphery of said power cable cam assembly. 
   
   
       16 . The compound bow of  claim 13  wherein the tracks on said take up portion and said let out portion of the power cable cam component of ether the upper or lower cam assembly are distinct, non-continuous tracks on the periphery of said power cable cam assembly. 
   
   
       17 . The compound bow of  claim 13  wherein at least one of said let out portions of said power cable cam component of said upper or lower cams is a modular unit. 
   
   
       18 . The compound bow of  claim 17  wherein said let out portion is attached to a power cable cam component. 
   
   
       19 . The compound bow of  claim 13  wherein said upper cam assembly further comprises a draw stop pin. 
   
   
       20 . The compound bow of  claim 19  wherein said draw stop pin is attached to a let out portion of said power cable cam component of either said upper or lower cam assembly.