US Patent 7047958 Compact archery compound bow with improved efficiency features

A compound archery bow includes a rigid riser with, at either end, a pair of side plates which support a spool assembly that includes a bowstring spool and a cam spool which rotate together. As an archer draws the bowstring back, the bowstring spool rotates the cam spool, which reels drive cable off of the major lobe of a cam assembly at the same end of the bow, while the minor lobe of the assembly reels in a buss cable attached to the bow limb tip, flexing the limb.