Archery extension bar

Abstract

An archery extension bar that attenuates vibration transmitted to a fixing portion due to vibration caused by restoration of a bow part after shooting of an arrow. The archery extension bar (3) includes: a support portion (9) having a predetermined length; a fixing portion (10), which is located on one end side of the support portion (9) in a longitudinal direction, and is configured to be fixed to a bow part (1); and a mounting portion (11), which is located on another end side of the support portion, and is configured to allow a sight (5) to be mounted thereto. The support portion has a small vertical sectional area portion (13), which has a vertical sectional area smaller than a vertical sectional area of the fixing portion and extends over an entire range or a part of a range of the support portion in the longitudinal direction.

1 . An archery extension bar, comprising:
 a support portion having a predetermined length;   a fixing portion, which is located on one end side of the support portion in a longitudinal direction of the support portion, and is configured to be fixed to a bow part; and   a mounting portion, which is located on another end side of the support portion, and is configured to allow a sight to be mounted thereto,   wherein the support portion has a small vertical sectional area portion, which has a vertical sectional area smaller than a vertical sectional area of the fixing portion and extends over an entire range or a part of a range of the support portion in the longitudinal direction.   
     
     
         2 . The archery extension bar according to  claim 1 , wherein the small vertical sectional area portion has a gradually reduced portion with a vertical sectional area gradually reduced from the fixing portion side toward the mounting portion side. 
     
     
         3 . The archery extension bar according to  claim 1 ,
 wherein the support portion, the fixing portion, and the mounting portion are formed integrally as a plate-like member having an elongated shape, and   wherein the small vertical sectional area portion is formed by setting a vertical length of the support portion in an up-and-down direction smaller than a vertical length of the fixing portion in the up-and-down direction over the entire range or the part of the range of the support portion in the longitudinal direction.   
     
     
         4 . The archery extension bar according to  claim 1 ,
 wherein the support portion, the fixing portion, and the mounting portion are formed integrally as a plate-like member having an elongated shape, and   wherein the small vertical sectional area portion is formed by setting a vertical length of the support portion in an up-and-down direction smaller than a vertical length of the fixing portion in the up-and-down direction over the entire range or the part of the range of the support portion in the longitudinal direction and setting a width of the support portion in a thickness direction smaller than a width of the fixing portion in the thickness direction over the entire range or the part of the range of the support portion in the longitudinal direction.   
     
     
         5 . The archery extension bar according to  claim 3 , wherein the plate-like member includes:
 a main member having a substantially rectangular shape with a length in the longitudinal direction corresponding to a sum of lengths of the fixing portion, the support portion, and the mounting portion; and   a sub member having a substantially rectangular shape with a vertical length in the up-and-down direction set larger than a vertical length of the main member in the up-and-down direction and a length in the longitudinal direction set smaller than a length corresponding to a sum of the lengths of the fixing portion and the support portion, and   wherein the plate-like member is completed by firmly fixing the sub member to one end portion of the main member.   
     
     
         6 . The archery extension bar according to  claim 2 ,
 wherein the support portion, the fixing portion, and the mounting portion are formed integrally as a plate-like member having an elongated shape, and   wherein the small vertical sectional area portion is formed by setting a vertical length of the support portion in an up-and-down direction smaller than a vertical length of the fixing portion in the up-and-down direction over the entire range or the part of the range of the support portion in the longitudinal direction.   
     
     
         7 . The archery extension bar according to  claim 2 ,
 wherein the support portion, the fixing portion, and the mounting portion are formed integrally as a plate-like member having an elongated shape, and   wherein the small vertical sectional area portion is formed by setting a vertical length of the support portion in an up-and-down direction smaller than a vertical length of the fixing portion in the up-and-down direction over the entire range or the part of the range of the support portion in the longitudinal direction and setting a width of the support portion in a thickness direction smaller than a width of the fixing portion in the thickness direction over the entire range or the part of the range of the support portion in the longitudinal direction.   
     
     
         8 . The archery extension bar according to  claim 4 ,
 wherein the plate-like member includes:
 a main member having a substantially rectangular shape with a length in the longitudinal direction corresponding to a sum of lengths of the fixing portion, the support portion, and the mounting portion; and 
 a sub member having a substantially rectangular shape with a vertical length in the up-and-down direction set larger than a vertical length of the main member in the up-and-down direction and a length in the longitudinal direction set smaller than a length corresponding to a sum of the lengths of the fixing portion and the support portion, and 
   wherein the plate-like member is completed by firmly fixing the sub member to one end portion of the main member.