Archery Bow with Circular String Track

Abstract

In some embodiments, an archery bow comprises a riser, a first limb supported by the riser and a second limb supported by the riser. A first rotatable member is supported by the first limb and arranged to rotate on a first axis and a second rotatable member is supported by the second limb and arranged to rotate on a second axis. The first rotatable member comprises a first bowstring track comprising a first arc having a constant radius and a center located on the first axis. The second rotatable member comprises a second bowstring track comprising a second arc having a constant radius and a center located on the second axis. A bowstring comprises a first end attached to the first rotatable member and a second end attached to the second rotatable member.

1 . An archery bow comprising:
 a riser;   a first limb supported by said riser;   a second limb supported by said riser;   a first rotatable member supported by said first limb and arranged to rotate on a first axis, said first rotatable member comprising a first bowstring track, said first bowstring track comprising a first arc having a constant radius and a center located on said first axis;   a second rotatable member supported by said second limb and arranged to rotate on a second axis, said second rotatable member comprising a second bowstring track, said second bowstring track comprising a second arc having a constant radius and a center located on said second axis; and   a bowstring comprising a first end attached to said first rotatable member and a second end attached to said second rotatable member.   
     
     
         2 . The archery bow of  claim 1 , wherein said first arc comprises a central angle of at least 90 degrees. 
     
     
         3 . The archery bow of  claim 1 , wherein said first arc comprises a central angle of at least 180 degrees. 
     
     
         4 . The archery bow of  claim 1 , wherein said first arc comprises a central angle of at least 270 degrees. 
     
     
         5 . The archery bow of  claim 1 , said first rotatable member comprising a first cam, said second rotatable member comprising a second cam. 
     
     
         6 . The archery bow of  claim 5 , wherein a shape of said first rotatable member comprises a mirror image of a shape of said second rotatable member. 
     
     
         7 . The archery bow of  claim 5 , wherein a first power cable comprises a first end segment in contact with the first cam and a second end attached to the second rotatable member. 
     
     
         8 . The archery bow of  claim 7 , said second rotatable member comprising a cable anchor having an anchor axis offset from said second axis, said first power cable second end attached to said cable anchor. 
     
     
         9 . The archery bow of  claim 7 , wherein a second power cable comprises a first end segment in contact with the second cam and a second end attached to the first rotatable member. 
     
     
         10 . The archery bow of  claim 1 , wherein an outer periphery of said first rotatable member comprises a circle. 
     
     
         11 . An archery bow comprising:
 a riser;   a first limb supported by said riser;   a second limb supported by said riser;   a first rotatable member supported by said first limb and arranged to rotate on a first axis, said first rotatable member comprising a first bowstring track and a first cam track, said first bowstring track comprising a first arc having a constant radius and a center located on said first axis;   a second rotatable member supported by said second limb and arranged to rotate on a second axis, said second rotatable member comprising a second bowstring track and a second cam track, said second bowstring track comprising a second arc having a constant radius and a center located on said second axis;   a first power cable comprising a segment in contact with said first cam track;   a second power cable comprising a segment in contact with said second cam track; and   a bowstring extending between said first rotatable member and said second rotatable member.   
     
     
         12 . The archery bow of  claim 11 , wherein said first rotatable member is supported by a first axle, said second power cable attached to said first axle. 
     
     
         13 . The archery bow of  claim 12 , wherein said second rotatable member is supported by a second axle, said first power cable attached to said second axle. 
     
     
         14 . The archery bow of  claim 11 , wherein said bowstring comprises a first end attached to said first rotatable member and a second end attached to said second rotatable member. 
     
     
         15 . The archery bow of  claim 11 , said second rotatable member comprising a cable anchor having an anchor axis offset from said second axis, said first power cable attached to said cable anchor. 
     
     
         16 . The archery bow of  claim 15 , said first rotatable member comprising a second cable anchor having an anchor axis offset from said first axis, said second power cable attached to said second cable anchor. 
     
     
         17 . The archery bow of  claim 11 , wherein said first arc comprises a central angle of at least 180 degrees. 
     
     
         18 . An archery bow comprising:
 a riser;   a first limb supported by said riser;   a second limb supported by said riser;   a bowstring;   a first rotatable member supported by said first limb and arranged to rotate on a first axis, said first rotatable member comprising a first bowstring track having a first working portion, said first working portion arranged to feed out said bowstring as the bow is drawn, said first working portion comprising a first arcuate portion having a constant radius and a center located on said first axis; and   a second rotatable member supported by said second limb and arranged to rotate on a second axis, said second rotatable member comprising a second bowstring track having a second working portion, said second working portion arranged to feed out said bowstring as the bow is drawn, said second working portion comprising a second arcuate portion having a constant radius and a center located on said second axis.   
     
     
         19 . The archery bow of  claim 18 , wherein said first arcuate portion comprises at least half of a length of said first bowstring track working portion. 
     
     
         20 . The archery bow of  claim 18 , wherein said first arcuate portion comprises at least 60% of a length of said first bowstring track working portion.