Patent ID: 8651095

Claim:
A crossbow comprising a stock situated at a medial plane of the crossbow, a transverse riser at a distal end of the stock, pair of power limbs or spring limbs disposed one at each end of the riser, each of said power limbs or spring limbs being formed as a flexible resilient bar spring to supply motive force for an arrow or bolt to be fired from said crossbow, and each said power limb or spring limb having one free end and another end that is affixed to the respective end of the riser, the spring limbs each projecting from said riser to said free end; cam wheels each pivotally mounted at a pivot at the free end of each of the associated power limbs; the cam wheels each having a bowstring groove wherein a bowstring is reeved to each of the cam wheels and travels in the respective bowstring grooves to be wound and unwound therefrom, and upper and lower power cord cam grooves disposed axially above and below the associated bowstring groove of the cam wheel; power cords which are flexible and inextensible and are wound into the power cord cam grooves; and anchor members affixed to the respective side of the medial plane corresponding to the crossbow bolt axis and defining fixed anchor points in respect to said stock; wherein the power cords are affixed at ends remote from the cam wheel into the respective anchor member at the associated anchor point, such that none of the power cords extend across the medial plane to the other limb; and wherein the power cord cam grooves and the bowstring cam grooves are programmed such that the draw weight on the bow string increases from full brace position to full draw position without weight drop-off.