Cross bow

Abstract

The invention discloses a cross bow which comprises a shell, an arrow channel for containing an arrow is arranged on the shell, and the cross bow comprises at least one bow arm; the bow arm comprises a fixed end and a movable end; the movable end moves towards the fixed end due to pressure, and two convex parts in opposite directions are formed on the bow arm, so that the bow arm is in a wave shape; the bow arm restores deformation through reverse movement of the movable end; and a main chord of the cross bow is directly or indirectly connected with the movable end of the bow arm. The bow arm can generate large elastic potential energy, and kinetic energy consumed by transverse movement of the bow arm can be reduced; and the problem that the strokes of a plurality of bow arms are different is solved. The phenomenon that kinetic energy is consumed due to transverse movement of a reel is avoided, and more kinetic energy can be obtained by the arrow. By means of a string winding mode, a pre-pressing structure, a pre-tightening wheel and other structures, only the acting force of an elastic component can be overcome in the string winding process, deformation of the bow arm does not need to be overcome, the string winding process is quite easy and saves labor, and it is not needed to worry that due to insufficient tension, the bow arm rebounds to accidentally injure the human body.

Description

technical field [0001] The invention relates to the technical field of bow and arrow manufacturing, in particular to a crossbow. Background technique [0002] At present, the common crossbows on the market are mostly four-arm structures, that is, the bow arms are combined in pairs to set the left and right sides of the arrow path, and the moving ends of the two arms on each side are connected by winding wheels so that the two arms have the same journey. When in use, pull the main string, bend the four bow arms through the main string to generate elastic potential energy, and use the rebound of the four bow arms to launch the arrow. However, there are the following problems during the launching process: 1. Usually, the bow arm is bent near the fixed end, where the pressure is the greatest, so there are high requirements for the material of the bow arm; 2. Even if the bow arm is bent The space is connected and fixed by a winding wheel, but it is difficult to avoid the proble...

AI Technical Summary

Problems solved by technology

However, there are the following problems during the launching process: 1. Usually, the bow arm is bent near the fixed end, where the pressure is the greatest, so there are high requirements for the material of the bow arm; 2. Even if the bow arm is bent The space is connected and fixed by a winding wheel, but it is difficult to avoid the problem of asynchronous travel during the rebound process, which will lead to kinetic energy loss on the bow arm; 3. The bending direction of the bow arm is forward, and once an accident occurs Exploding the bow while aiming, the bow arm will directly rebound and hit the user's head, causing serious damage

4. When winding, pull the main string to drive the bow arms to bend, and the user needs to overcome the hardness of the four arms to complete the winding. Not only is it unsafe, but the bow arms will spring back in advance once the force is unloaded, and it requires more labor for the user. Winding with great force

5. When the arrow is fired, the bow arm rebounds in the horizontal direction, and the winding wheel installed at the moving end of the bow arm swings in the horizontal direction together, so that the translation of the bow arm, the translation of the winding wheel, and the rotation of the winding wheel itself And the movement of the bowstring will consume the kinetic energy of the bow and arrow, which will reduce the actual kinetic energy of the arrow, reduce the speed of the arrow launch, and make a lot of noise on the bowstring

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