Importance

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Abstract

There is disclosed a pulley mechanism for a compound bow which allows the drawstring to move through its full range of motion while the compound bow bends only a relatively short distance. Because the compound bow returns to its resting position quickly, the resultant forward motion of the drawstring is faster and thus the arrow moves with greater speed and accuracy. The drawstring pulley of the compound bow is driven by a center gear mating with a fixed gear at the end of the bow arm. The drawstring pulley is thus driven in an orbit around the end of the bow arm. In turn, the compound bow power pulley is driven in an orbit centered by an off-set hub and powered from its center by the motion of the drawstring pulley. The drawstring pulley is free to revolve on full revolution while the power pulley only revolves one-half turn. Because the actural circumference of the power pulley is round while the pulley circumscribes an elliptical arc (due to the off-set center point) there is a smoth 'break-over' when the drawstring is released. Arrow quiver is reduced by the smooth break-over as well as by the reduced arc through which the bow ends must move upon release of the drawn bow string.

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First Claim