Abstract: Provided is an arrow, wherein by forming a diameter of a shaft, at a fore end of which a point is combined and at a rear end of which a nock is combined, in such a way that the diameter is reduced going from the fore end to the rear end, a center of weight is shifted toward the fore end so as to increase a hitting ratio of the arrow and a deflection deformation is reduced.

Abstract: Provided is a compound bow comprising: a bow main body; upper and lower pulley assemblies; a bowstring; and first and second cam cables, wherein at least one of the first and second cam cables is coupled to the fixing projection that moves along as a cam module moves, is wound on a cam cable winding portion via a compensation projection, and then extends toward the other side pulley assembly, and a front portion of the cam module is in contact with the one cam cable and thus the one cam cable is bent when the cam module is moved, to thus release the one cam cable from the cam cable winding portion via the compensating projection from the fixing projection that the one cam cable is coupled, to thereby maintain constant tension of the cam cable and keep the power of the bow.

Abstract: Disclosed is a frame body for a bicycle which is able to provide higher strength and reduce the weight of the body frame in such a way to use a carbon material even when the outer diameters of a top tube and a bottom tube are thinner same as the thickness of the tubes forming a classical type body frame. In the body frame for a bicycle, at least one tube among the top tube, the bottom tube and the seat tube is made of a carbon material outer tube of a pipe shape the diameter of which is same from one end to the other end, and an inner tube made of a carbon material in a tubular shape and having a cross section area smaller than the cross section area of the outer tube is fixedly installed in the inside of a predetermined section of the outer tube.

Abstract: Disclosed herein is a body frame for a bicycle which is able to provide higher strength in such a way to use a carbon material even when the outer diameters of a top tube, a bottom tube, a seat tube, a chain tube, etc. have the thickness of a body frame of a classical bicycle, while relatively reducing the weight of the body frame. For this, the body frame for a bicycle according to the present invention is configured in such a way that each of the top tube, the bottom tube and the seat tube is made in a circular shape wherein the outer diameters are same from one end to the other end of each tube, and the flesh thickness of each tube is relatively thicker at the other end portion than one end portion, and each tube is made of a carbon material.

Abstract: Provided is a recurved bow including: a handle; a pair of limbs coupled at both ends of the handle; and a bowstring, wherein a projecting coupling member is provided in front of each of the limbs, and is extended forwardly from each of the limbs, and has a coupling portion in the front thereof, and is coupled with a coupling pin of a rear side of each of the limbs, and wherein a damper member is provided in which the damper member comprises a corresponding coupler that is coupled with the coupling portion formed in front of each of the projecting coupling member, and a damper coupled with the front of the corresponding coupler, to thereby rapidly damp vibrations generated in one end of each of the limbs to thus enhance a vibration damping function.

Abstract: Provided is a self-tunable compound bow including: a bow main body including a pair of limbs that are respectively coupled to both ends of a handle; upper and lower pulley assemblies that are respectively coupled to the rear end of each limb; a bowstring; and first and second cam cables that are wound around a cam of each of the upper and lower pulley assemblies as the bowstring is pulled. A contact pin is formed in one of the pulley assemblies, in which the contact pin is in contact with one limb when the bowstring is pulled, and an indicator is formed in the other of the pulley assemblies, in which the indicator is in contact with the other limb and moves when the bowstring is pulled in a guide hole formed in the pulley of the other of the pulley assemblies.

Abstract: Provided is a self-tunable compound bow including: a bow main body including a pair of limbs that are respectively coupled to both ends of a handle; upper and lower pulley assemblies that are respectively coupled to the rear end of each limb; a bowstring; and first and second cam cables that are wound around a cam of each of the upper and lower pulley assemblies as the bowstring is pulled. A contact pin is formed in one of the pulley assemblies, in which the contact pin is in contact with the first cam cable when the bowstring is pulled, and an indicator is formed in the other of the pulley assemblies, in which the indicator is in contact with the second cam cable and moves when the bowstring is pulled in a guide hole formed in the pulley of the other of the pulley assemblies.

Abstract: A compound bow has an improved vibration damping function. The compound bow includes a bow main body including a handle and a pair of limbs; upper and lower pulley assemblies each including a pulley and a cam; a bowstring; first and second cam cables that are wound around the cam of each of the upper and lower pulley assemblies as the bowstring is pulled; a bowstring support bar whose one end is coupled to the handle and whose other end is coupled to a cushioning member that contacts the bowstring; and a first cam cable anti-vibration bar including a coupling bar coupled to the handle, and an anti-vibration member that is coupled to the rear end of the coupling bar and whose rear surface contacts one of the first and second cam cables when the bowstring is released to thus return to an original position.

Abstract: Provided is bow including: a handle; a pair of wings; and a bow string, wherein a coupling pin is formed in a rear side of one end of each wing coupled to the handle, and a fitting groove is formed at one end of each wing, wherein a coupling groove into which the coupling pin of each wing is coupled is formed at one end of the handle, and a fixing pin that is inserted into the fitting groove of each wing is formed at the one end of the handle, and wherein a buffer pin member that is configured to include a pin member that is inserted into an insertion hole formed in each wing and coupled to the handle and a first cushioning member that is formed between a front end of the pin member and each wing, is provided at each end of the handle.