Compound bow

Abstract

A compound bow includes a bow main body including a handle and a pair of limbs. Upper and lower pulleys are coupled to the rear end of each limb. A bowstring is provided and a cam that is coupled to each pulley. A rotating wheel is coupled with the rotating shaft of the pulley. Cam cables are wound around the cams, in which one end of each cam cable is coupled to one pulley and the other end thereof is coupled to the other pulley. A cam cable guide member has one end rotatably coupled to the rotating shaft of the pulley, and at the other end of which a support member for supporting the cam cable is formed in order to make a portion of the cam cable extended from the rotating wheel guided in parallel with the pulley.

What is claimed is: 
     
         1 . A compound bow comprising:
 a bow main body including a handle at a central portion of which a grip portion is formed and a pair of limbs that are respectively coupled to both ends of the handle;   upper and lower pulley assemblies each including a pulley that is rotatably coupled to a rotating shaft formed on the rear end of each limb, and a cam that is coupled to one side of the pulley and rotating with the pulley;   a bowstring whose either end is wound and coupled to the pulley of each of the upper and lower pulley assemblies; and   two cam cables that are wound 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 two cam cables is coupled to one of the upper and lower pulley assemblies, and the other end thereof is coupled to the other of the upper and lower pulley assemblies or the rotating shaft of the other of the upper and lower pulley assemblies;   wherein at least one of the upper and lower pulley assemblies further comprises:   a rotating wheel that is coupled with the rotating shaft of the pulley on the other side surface opposing to one side surface of the pulley to which the cam is coupled, in which one of the two cam cables is coupled to the other side surface of the pulley, wound on the rotating wheel, and extended toward the other of the upper and lower pulley assemblies; and   a cam cable guide member one end of which is rotatably coupled to the rotating shaft of the pulley separately from the pulley, at one side of the rotating wheel, in which the cam cable guide member is extended by a predetermined length along one of the cam cables extended toward the other of the upper and lower pulley assemblies from the rotating wheel, and at the other end of which a support member for supporting one of the cam cables is formed in order to make a portion of one of the cam cables extended from the rotating wheel guided in parallel with the pulley.   
     
     
         2 . The compound bow of  claim 1 , wherein the rotating wheel is rotatably coupled to the rotating shaft separately from the pulley. 
     
     
         3 . The compound bow of  claim 1 , wherein the support member of the cam cable guide member comprises a guide pulley and a support pulley that are respectively rotatably coupled to two shaft members respectively located at both sides of the cam cable, in which the cam cable is supported between the guide pulley and the support pulley. 
     
     
         4 . The compound bow of  claim 3 , wherein a guide groove for guiding the cam cable is formed on an outer circumferential surface of the guide pulley. 
     
     
         5 . The compound bow of  claim 3 , wherein the support pulley is formed at the front of the guide pulley, and is located at a longer distance from the rotating shaft of the cam cable guide member than the guide pulley. 
     
     
         6 . The compound bow of  claim 5 , wherein the support pulley is formed to have an outer diameter of an outer circumferential surface of the support pulley that guides the cam cable in contact with the cam cable becomes smaller inwards, and thereby guides the cam cable to a cable guard that is coupled to the handle of the bow main body and pushes the cam cable in one direction. 
     
     
         7 . The compound bow of  claim 3 , further comprising a support bar one end of which is rotatably coupled to the rotating shaft separately from the pulley at the other side surface of the pulley to which the cam cable guide member is coupled, so as to oppose the cam cable guide member, and at the other end of which two support protrusions are formed for supporting each of the guide pulley and the pulley support of the cam cable guide member. 
     
     
         8 . The compound bow of  claim 1 , wherein two coupling portions to which the rotating shaft is coupled are formed at one end of the cam cable guide member, in which the two coupling portions are coupled to the rotating shaft at both sides of one of two branches adjacent to the rotating wheel of the two branches that form a rear portion of the limbs. 
     
     
         9 . The compound bow of  claim 8 , wherein the cam cable guide member is made in an arch-shaped form. 
     
     
         10 . The compound bow of  claim 8 , wherein the support member of the cam cable guide member comprises a guide pulley and a support pulley that are rotatably coupled to two shaft members located at both sides of the cam cable, in which the cam cable is supported between the guide pulley and the support pulley.