Abstract:
The boxing training device of the present invention includes two hollow elastic elements which locate on two different positions. The boxing training device also includes two slidable and rigid sliders. The slider can be moved into the elastic element so that the elastic element can be limited by the slider. As such, the whole device does not sway when transporting without disassembling. Also, said device can provide a variety of way to use.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a boxing training device, more particularly to an adjustable and safe device that the extent of sway can be adjusted and the way to use is changeable. 
     2. Description of the Prior Art 
     A typical boxing training device is as disclosed in TW510239. The boxing training device includes a base, a shaft disposed on the base, and a hit portion disposed on the upper end of the shaft. Wherein, an elastic element, such as a spring, is disposed between the base and the shaft. 
     But the device as mentioned above can sway at only one mode so that the device can not provides more ways to use. Also, the device is easy to sway when transported or moved without disassembling so that it makes transporting more dangerous and inconvenient. 
     The present invention, therefore, makes improvements on the disadvantages as mentioned above. 
     SUMMARY OF THE INVENTION 
     The main object of the present invention is to provide a training device which is adjustable and safe to use. 
     To achieve the above and other objects, a boxing training device of the present invention includes a base portion, a support portion and a hit portion, wherein the support portion includes a hollow shaft, two sliders, and two hollow elastic elements. A longitudinal axis is defined along the extending direction of the shaft. Two ends of the shaft connected to the two elastic elements respectively. Two slots which extend along the longitudinal axis locate on wall of the shaft. The two slots locate near two opposite ends of the shaft. The sliders are columns and are slidably disposed in the shaft. The sliders have fixing members and part of the fixing elements is exposed out of the shaft. The fixing members connect to the sliders through the slots. The slider can be moved into the elastic element in order to limit the action of the elastic element. 
     Thereby, the extent of sway is able to be adjusted, so the way of use is changeable. Also, the device may not sway when all the elastic elements are fixed so that transporting or moving the device without disassembling may be much easier and safer. 
     The present invention will become more obvious from the following description when taken in connection with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment(s) in accordance with the present invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a stereogram showing a boxing training device of the present invention; 
         FIG. 2  is a breakdown drawing showing a boxing training device of the present invention; 
         FIG. 3  is a partial enlargement perspective view showing a first condition of using of the present invention; 
         FIG. 4  is a partial enlargement perspective view showing a second condition of using of the present invention; 
         FIG. 5  is a perspective view showing a first mode of operation of the present invention; 
         FIG. 6  is a perspective view showing a second mode of operation of the present invention; 
         FIG. 7  is a perspective view showing a third mode of operation of the present invention; 
         FIG. 8  is a perspective view showing a forth mode of operation of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Please refer to  FIG. 1  and  FIG. 2 , the boxing training device includes a base portion  1 , a support portion  2 , and a hit portion  3 . 
     The base portion  1  has lower fixing element  11  which is a hollow tube with a blind end. Said blind end on the lower fixing element  11  locates on an end near the base portion  1 . The lower fixing element  11  is fixed to the base portion  1  by screws. The lower fixing element  11  is threaded on its inner wall. Moreover, an inner tube  111  is disposed in the lower fixing element  11 . 
     The support portion  2  includes a shaft  21 , a first slider  24 , a second slider  24 ′, a hollow first elastic element  22  and a hollow second elastic element  22 ′. A longitudinal axis is defined along the extending direction of the shaft  21 . The shaft  21  of the support portion  2  is composed of two hollow tubes having different external diameters, and the hollow tube with smaller diameter is partly received in adjacent hollow tube. The hollow tube with larger diameter has a threaded hole on its wall. The shaft  21  has an adjustment element  25  which is used for adjusting a length of the shaft  21 . One end of the adjustment element  25  has a bolt to be engaged to the threaded holes of the outer tubes of the shaft  21 . One end of the shaft  21  is engaged to the first elastic element  22 , and the other end of the shaft  21  is engaged to the second elastic element  22 ′. A protection element  221 ,  221 ′ is disposed around the connection between each elastic element  22 ,  22 ′ and the shaft  21 . A first slot  23  and a second slot  23 ′ are formed on different positions on the shaft  21  wall respectively, and each slot  23 ,  23 ′ extends along the longitudinal axis. Moreover, the two slots  23 ,  23 ′ locate on two ends of the shaft  21  respectively. Each of the first slider  24  and the second slider  24  is a column and is slidably received in the shaft  21 . The first slider  24  has a first fixing member  241 , and the second slider  24 ′ has a second fixing member  241 ′. Each of the fixing members  241 ,  241 ′ is partly exposed out of the shaft  21 . Each slider  24 ,  24 ′ has a threaded hole, and each fixing member  241 ,  241 ′ has a bolt at one end. The first fixing member  241  is engaged to the threaded hole of the first slider  24  via the first slot  23 , and the second fixing member  241 ′ is engaged to the threaded hole of the second slider  24 ′ via the second slot  23 ′. Wherein, each fixing member  241 ,  241 ′ has a protrusion  2411 ,  2411 ′ whose diameter is larger than the diameter of the bolt of the fixing member  241 ,  241 ′. Each slot  23 ,  23 ′ has ends whose widths are not smaller than the diameter of the protrusion  2411 ,  2411 ′ of the corresponding fixing member  241 , 241 ′, and a width between the two ends of each slot  23 ,  23 ′ is smaller than the diameter of the protrusion  2411 ,  2411 ′ of the corresponding fixing member  241 ,  241 ′. 
     The hit portion  3  has an upper fixing element  31  which is a hollow tube with a blind end. The blind end locates on an end on the upper fixing element  31  near the hit portion  3 . The inner wall of the upper fixing element  31  is threaded. An inner tube is disposed in the upper fixing element. 
     The first elastic element  22  is screwed to the inner wall of the lower fixing element  11 , and the second elastic element  22 ′ is screwed to the inner wall of the upper fixing element  31 . The first slider  24  is able to be received in the inner tube of the lower fixing element  11 , and the second slider  24 ′ is able to be received in the inner tube of the upper fixing element  31 . 
     About the action mechanisms of the sliders  24 ,  24 ′, the first slider  24  is considered as an example. Please refer to  FIG. 3  for the first condition of using of the present invention. When the first slider  24  is moved out of the first elastic element  22 , the first elastic element  22  is able to sway. For being fixed better, the first fixing member  241  is screwed to the first slider  24  remote from the first elastic element  22  at an end of the first slot  23 . And then, the protrusion  2411  of the first fixing member  241  is embedded to the wilder end of the first slot, wherein the wilder end is away from the first elastic element  22 . 
     Please refer to  FIG. 4  for the second condition of using of the present invention. When the first slider  24  is moved into the first elastic element  22 , the first elastic element  22  is not able to sway. For being fixed better, the first fixing member  241  is screwed to the first slider  24  near the first elastic element  22  at an end of the first slot  23 . And then, the protrusion  2411  of the first fixing member  241  is embedded to the wilder end of the first slot  23 , wherein the wilder end is near the first elastic element  22 . 
     The action mechanism of the second slider  24 ′, the second slot  23 ′, and the second elastic element  22 ′ is similar to the example mentioned above. 
     In respect of the usage, please refer to  FIG. 5  to  FIG. 8  for different modes of operation of the present invention. 
     Please refer to  FIG. 5  for the first mode of operation of the present invention, the first elastic element  22  and the second elastic element  22 ′ are both not fixed and are free to sway. Under this condition, the extent of sway is larger and the rebound time of the hit portion is longer. In other words, the strength of rebound is smaller. 
     Please refer to  FIG. 6  for the second mode of operation of the present invention, the second elastic element  22 ′ is fixed, but the first elastic element  22  is not fixed and is free to sway. Under this condition, the extent of sway and the rebound time of the hit portion are moderate. 
     Please refer to  FIG. 7  for the third mode of operation of the present invention, the first elastic element  22  is fixed, but the second elastic element  22 ′ is not fixed and is free to sway. Under this condition, the extent of sway is smaller and the rebound time of the hit portion is shorter. In other words, the strength of rebound is larger. 
     Please refer to  FIG. 8  for the forth mode of operation of the present invention, both the first elastic element  22  and the second elastic element  22 ′ are fixed. Under this condition, the support portion  2  and the hit portion  3  do not sway when transporting or moving without disassembling. On the other hand, this mode prevents rebounding of the hit portion when the device is hit accidentally so that the safety is improved. 
     In conclusion, the present invention has the following advantages:
         1. The extent of the sway is adjustable so that more ways of using are provided.   2. The height of the device is adjustable.   3. Transporting becomes easier and safer.