Archery cushion plunger

Abstract

The present disclosure relates to an archery cushion plunger in which a structure is changed so that a plunger shaft in contact with an arrow shaft passes through a center of an elastic member, the plunger shaft stably grips the center of the elastic member, and thus deformation of the elastic member may be fundamentally prevented even when a pressure is applied to front and rear sides of the elastic member during adjustment of a tensile force. Therefore, a tip portion of the plunger in contact with the arrow shaft is always in horizontal contact with the arrow shaft to stably compensate for horizontal vibration, stable flight of an arrow is induced, and thus a hit rate of the arrow can be improved.

What is claimed is: 
     
         1 . An archery cushion plunger comprising:
 a sleeve;   a plunger shaft that buffers a lateral pressure of an arrow shaft through a tip portion exposed to one end of the sleeve;   an elastic member which is embedded in the sleeve and has a front surface horizontally stopped and supported on the plunger shaft in a direction of the arrow shaft and through which the plunger shaft is coupled at a center thereof;   a tensile force adjustment cylinder into which a rear part of the plunger shaft is slidably inserted and of which a front surface is in contact with a rear surface of the elastic member such that the tensile force adjustment cylinder is horizontally stopped and supported; and   a tensile force adjustment housing that is screw-coupled to an outer surface of the sleeve to rotate about the sleeve and adjusts a tensile force of the elastic member by linearly moving the tensile force adjustment cylinder along the plunger shaft while linearly moving along the sleeve in a rotational direction.   
     
     
         2 . The archery cushion plunger of  claim 1 , further comprising a ball plunger that moves into a hollow of the tensile force adjustment housing through a fastening hole formed in the tensile force adjustment housing and is vertically coupled to a tensile force adjustment groove formed in a rear part of the sleeve inserted into the tensile force adjustment housing. 
     
     
         3 . The archery cushion plunger of  claim 2 , wherein an alignment key groove is formed in the outer surface of the sleeve in a horizontal cut surface structure so that the alignment key groove is horizontally parallel to a first tensile force adjustment groove among the tensile force adjustment grooves formed in the sleeve. 
     
     
         4 . The archery cushion plunger of  claim 1 , wherein the tensile force adjustment cylinder includes:
 an outer ring;   an inner ring inserted into the outer ring; and   a ball installed between the outer ring and the inner ring.   
     
     
         5 . The archery cushion plunger of  claim 1 , wherein the plunger shaft includes:
 a front part having the tip portion;   a rear part connected to a rear end of the front part and inserted into the tensile force adjustment cylinder; and   a step part that is formed at a boundary between the front part and the rear part, protrudes outer surfaces of the front part and the rear part, and is in contact with the front surface of the elastic member to be stopped and supported.   
     
     
         6 . The archery cushion plunger of  claim 1 , wherein a separation prevention step by which a step part of the plunger shaft supported by the front surface of the elastic member in the direction of the arrow shaft is stopped is formed inside the sleeve. 
     
     
         7 . The archery cushion plunger of  claim 1 , further comprising a fixing nut screw-coupled to the outer surface of the sleeve. 
     
     
         8 . The archery cushion plunger of  claim 1 , wherein when viewed in the direction of the arrow shaft, the tensile force adjustment housing is formed in a polygonal structure. 
     
     
         9 . The archery cushion plunger of  claim 1 , wherein the front surface of the rear force of the elastic member are polished to have a surface step of 0.3 mm or less.