Quick change back up pad

Abstract

A quick change back up pad comprises a grinding disc and a base, and the base is connected between the grinding disc and a grinding hand tool. Wherein, the quick change back up pad comprises a gap formed between the base and the grinding disc and communicated to the outside, and a plurality of air holes communicated with the gap is formed through the base. Accordingly, the plurality of air holes forms an airflow during a rotation process of the quick change back up pad, such that heat energy generated by the operation of the quick change back up pad can be dissipated by the airflow from the gap to the outside of the plurality of air holes, thereby solving a problem that a grinding disc is difficult to perform heat dissipation since a surface thereof is covered during the conventional implementation.

What is claimed is: 
     
         1 . A quick change back up pad, selectively assembled on a grinding hand tool, comprising:
 a grinding disc; and   a base, connected between the grinding disc and the grinding hand tool;   wherein, the quick change back up pad comprises a gap formed between the base and the grinding disc and communicated to the outside, a plurality of air holes communicated with the gap is formed through the base, and the plurality of air holes forms an airflow for performing heat exchange on the grinding disc during a rotation process of the quick change back up pad; and   wherein, the grinding disc comprises a first assembly portion disposed at the center of a surface of the grinding disc, and the base comprises a second assembly portion disposed at the center of the base and used for the first assembly portion to assemble and fix.   
     
     
         2 . The quick change back up pad according to  claim 1 , the plurality of air holes is circularly disposed in the base. 
     
     
         3 . The quick change back up pad according to  claim 2 , the plurality of air holes is disposed in an outer edge of the base. 
     
     
         4 . The quick change back up pad according to  claim 3 , a distance between any two of the plurality of air holes is the same as each other. 
     
     
         5 . The quick change back up pad according to  claim 1 , shapes of the plurality of air holes are all circular shapes. 
     
     
         6 . The quick change back up pad according to  claim 2 , shapes of the plurality of air holes are all circular shapes. 
     
     
         7 . The quick change back up pad according to  claim 3 , shapes of the plurality of air holes are all circular shapes. 
     
     
         8 . The quick change back up pad according to  claim 4 , shapes of the plurality of air holes are all circular shapes. 
     
     
         9 . The quick change back up pad according to  claim 1 , the base comprises a concave surface facing the gap. 
     
     
         10 . The quick change back up pad according to  claim 2 , the base comprises a concave surface facing the gap. 
     
     
         11 . The quick change back up pad according to  claim 3 , the base comprises a concave surface facing the gap. 
     
     
         12 . The quick change back up pad according to  claim 4 , the base comprises a concave surface facing the gap.