Tension adjustment structure of boxing training device

Abstract

A tension adjustment structure of a boxing training device contains: a base, at least one control module for controlling a tension of a spring, and an impact module. The base includes a first fitting tube and a first screwing element. The impact module includes a coupling stem. The at least one control module includes a first support post, the spring, a second support post, a second fitting tube, and a second screwing element. The coupling stem is inserted through the first support post and the second fitting tube, and the second screwing element is screwed into a locking orifice of the first support post to fix the coupling stem in the first support post and the second fitting tube. The spring is partially fitted on the first and second support posts, and a height of each of the first support post and the second support post is adjustable.

What is claimed is: 
     
         1 . A tension adjustment structure of a boxing training device comprising:
 a base, at least one control module configured to control a tension of a spring, and an impact module, the at least one control module being connected between the base and the impact module;   wherein the base includes a first fitting tube and a first screwing element, the impact module includes a coupling stem extending from a bottom of the impact module, and the at least one control module includes a first support post, the spring, a second support post, a second fitting tube, and a second screwing element;   wherein the coupling stem of the impact module is inserted through the first support post and the second fitting tube, and the second screwing element is screwed into a locking orifice of the first support post so as to fix the coupling stem in the first support post and the second fitting tube; wherein the spring is partially fitted on the first support post and the second support post, and a height of each of the first support post and the second support post is adjustable to adjust a tension of the spring and a gravity center of the tension adjustment structure.   
     
     
         2 . The tension adjustment structure as claimed in  claim 1 , wherein the base includes a connection portion formed on a center thereof, and the base includes the first fitting tube connected on the connection portion. 
     
     
         3 . The tension adjustment structure as claimed in  claim 1 , wherein the first support post and the second support post are hollow, and the spring is internally formed on the first support post and the second support post. 
     
     
         4 . The tension adjustment structure as claimed in  claim 1 , wherein the impact module includes a body and a coupling stem, wherein the body is hit by a user, and the coupling stem is connected on a bottom of the body.