Patent ID: 9335114
Filing Date: 2016-05-10
CPC Classification: F41B

Claim Text:
1. A self-tunable compound bow comprising: a bow main body including a handle at a central portion of which a grip portion is provided and a pair of limbs that are respectively coupled to opposite ends of the handle; upper and lower pulley assemblies each including a pulley that is rotatably coupled to a rotating shaft provided on the rear end of each limb, and a cam that is coupled to one side of the pulley for rotating with the pulley; a bowstring comprising opposite ends respectively wound and coupled to the pulleys of the upper and lower pulley assemblies; first and second cam cables that wind around the cam of each of the upper and lower pulley assemblies as the bowstring is pulled, in which one end of each of the first and second cam cables is coupled to one of the upper and lower pulley assemblies, and the other end of the first and second cam cables is coupled to the other of the upper and lower pulley assemblies; a contact pin operatively coupled to an coupling hole of the pulley of the one of the pulley assemblies to rotate together with the pulley while remaining fixed in the arcuate coupling hole until coming into contact with one limb to which the one of the pulley assemblies is coupled during pulling of the bowstring towards a let-off state, wherein the contact of the contact pin with the one limb causes the contact pin to move lengthwise along the arcuate coupling hole during further pulling of the bowstring to the let-off state; and an indicator operatively coupled to an arcuate guide hole of the pulley of the other of the pulley assemblies to rotate together with the pulley of the other of the pulley assemblies while remaining fixed in the arcuate guide hole until coming into contact with the other limb to which the other of the pulley assemblies is coupled during the pulling of the bowstring toward the let-off state, wherein the contact of the indicator with the other limb causes the indicator to move lengthwise along the arcuate guide hole during the further pulling of the bowstring to the let-off state.