Abstract:
A coupling structure for grinding members adopts a removable structure to fasten a grinding member to a pneumatic tool. One or more grinding member may be mounted on the coupling structure according to requirements. The coupling structure may be used repeatedly to reduce costs.

Description:
FIELD OF THE INVENTION  
       [0001]     The present invention relates to an improved coupling structure for grinding members and particularly to a removable coupling structure adopted for use on pneumatic tools.  
       BACKGROUND OF THE INVENTION  
       [0002]     The common pneumatic tool aims to provide a driving force through a pneumatic motor to rotate a spindle and drive a grinding member coupled on a distal end of the spindle to perform grinding operation. Refer to  FIG. 1  for a conventional grinding member  10  which is coupled with a fastening element  11  in an integrated manner. The fastening element  11  has a screw thread  12  on a distal end to be fastened to a coupling head  22  of a pneumatic tool  20 .  
         [0003]     As the grinding member  10  and the fastening element  11  are fabricated in an integrated manner, when the grinding member  10  has been used for a period of time and has to be replaced, the fastening element  1  I also is discarded. This results in an extra cost. Moreover, with the grinding member  10  and the fastening element  11  formed in an integrated manner, the number of the grinding member  10  is fixed and cannot be increased to meet the actual requirements. The overall practicality is lower.  
       SUMMARY OF THE INVENTION  
       [0004]     Therefore the primary object of the present invention is to provide an improved coupling structure for grinding members that adopts a removable design so that one or more grinding member can be coupled or replaced. And the coupling structure can be used repeatedly. Thus the cost may be reduced.  
         [0005]     In order to achieve the foregoing object, the coupling structure according to the invention aims to couple at least one grinding member on a pneumatic tool. It includes mainly a first clamping disk, a second clamping disk and a fastening element. The first clamping disk has a sleeve extended from the center of one side. The sleeve has a first aperture running through the first clamping disk. The second clamping disk has a second aperture in the center to receive the sleeve. The fastening element can run through the first aperture and the second aperture to hold the grinding member between the first clamping disk and the second clamping disk, thereby to fasten the grinding member to the pneumatic tool.  
         [0006]     The foregoing, as well as additional objects, features and advantages of the invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0007]      FIG. 1  is an exploded view of a conventional grinding member fastened to a pneumatic tool.  
         [0008]      FIG. 2  is a perspective view of the present invention fastened to a pneumatic tool.  
         [0009]      FIG. 3  is an exploded view of the present invention.  
         [0010]      FIG. 4  is a side view of the present invention fastened to a pneumatic tool. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0011]     Please referring to  FIGS. 2, 3  and  4 , the coupling structure for grinding members according to the invention aims to couple at least one grinding member  200  to a pneumatic tool  300 . In an embodiment of the invention, the coupling structure mainly includes a first clamping disk  110 , a second clamping disk  120  and a fastening element  130 .  
         [0012]     The first clamping disk  110  has a sleeve  112  extended from the center of one side. The sleeve  112  has a first aperture  114  running through the first clamping disk  110 . The sleeve  112  can run through an opening  202  formed in the center of the grinding member  200 . The second clamping disk  120  has a second aperture  122  in the center. The sleeve  112  runs through the grinding member  200  and the second aperture  122  of the second clamping disk  120 . The fastening element  130  can run through the first aperture  114  and the second aperture  122  to hold the grinding member  200  between the first clamping disk  110  and the second clamping disk  120 , thereby to fasten the grinding member  200  to the pneumatic tool  300 . In this embodiment, the fastening element  130  is a bolt which has a head  132  to be driven by a hand tool (not shown in the drawings) and a tail end formed with a screw thread  134  to be fastened to a coupling head  302  of the pneumatic tool  300 . By fastening the fastening element  130  to the coupling head  302 , the first clamping disk  110  and the second clamping disk  120  may be clamped tightly. In addition, a washer  140  may be deployed between the head  132  of the fastening element  130  and the second clamping disk  120  to increase the fastening effect. To those skilled in the art, the fastening element  130  is not limited to the bolt. A latch tenon may also be used. Moreover, the first clamping disk  110  and the second clamping disk  120  may be made of aluminum or an aluminum alloy that has a greater structural strength.  
         [0013]     Referring to  FIGS. 2 and 3 , in this embodiment, the distal end of the sleeve  112  remote from the first clamping disk  110  and the second aperture  122  of the second clamping disk  120  to be coupled therewith are formed respectively in a mating hexagonal shape (or other geometric shape that can form an interference) to increase the fastening effect between the sleeve  112  and the second clamping disk  120 , and prevent the sleeve  112  from slipping in the second aperture  122  when the grinding member  200  rotates at a high speed. In addition, the second clamping disk  120  around the second aperture  122  forms a polygonal flange  126  (such as a hexagonal shape shown in  FIG. 2 ) to facilitate clamping of a hand tool to prevent relative movement between the fastening element  130  and the second clamping disk  120  during fastening of the fastening element  130 .  
         [0014]     Referring to  FIGS. 3 and 4 , in this embodiment, the first clamping disk  110  and the second clamping disk  120  further have a plurality of lugs  116  and  124  on the surfaces in contact with the grinding member  200 . Upon fastening the fastening element  130 , the lugs  116  and  124  are slightly sunk in the grinding member  200  to increase the clamping effect of the first clamping disk  110  and the second clamping disk  120 .  
         [0015]     By means of the construction set forth above, the coupling structure for grinding members according to the invention can provide at least the following benefits:  
         [0016]     1. The coupling structure is removable, thus one or more grinding member may be coupled and replaced to enhance the practicality.  
         [0017]     2. As the coupling structure is removable, it can be used repeatedly after the grinding member has been replaced, hence the cost is reduced.  
         [0018]     While the preferred embodiments of the invention have been set forth for the purpose of disclosure, modifications of the disclosed embodiments of the invention as well as other embodiments thereof may occur to those skilled in the art. Accordingly, the appended claims are intended to cover all embodiments which do not depart from the spirit and scope of the invention.