Durable sander and oscillation buffer element applied to sander

Abstract

A durable sander comprises a body with a drive motor, a sanding disk driven by the drive motor to perform sanding movement against the body and at least one oscillation buffer element. The oscillation buffer element includes an upper connection bar fastened to the body, a lower connection bar fastened to the sanding disk and a plurality of buffer portions bridging the upper connection bar and lower connection bar in an integrated manner. Each buffer portion has a first connection end connected to the upper connection bar, a second connection end connected to the lower connection bar and an elastic buffer section interposed between the first connection end and second connection end. The length of the elastic buffer section is greater than the distance between the first connection end and the second connection end.

What is claimed is: 
     
         1 . A durable sander, comprising:
 a body holding a drive motor inside;   a sanding disk driven by the drive motor to perform sanding movement against the body; and   at least one oscillation buffer element which includes an upper connection bar fastened to the body, a lower connection bar fastened to the sanding disk and a plurality of buffer portions bridging the upper connection bar and the lower connection bar in an integrated manner; each of the plurality of buffer portion including a first connection end connected to the upper connection bar, a second connection end connected to the lower connection bar and an elastic buffer section interposed between the first connection end and the second connection end, the elastic buffer section being formed at a length greater than a distance between the first connection end and the second connection end.   
     
     
         2 . The durable sander of  claim 1 , wherein the first connection ends of the buffer portions are connected to each other and the second connection ends of the buffer portions are connected to each other. 
     
     
         3 . The durable sander of  claim 1 , wherein the first connection ends of the buffer portions are separated from each other and the second connection ends of the buffer portions are separated from each other. 
     
     
         4 . The durable sander of  claim 1 , wherein the first connection end and the second connection end of each buffer portion are located at a same vertical axis, the elastic buffer section of each buffer portion including at least one deviation section away from the vertical axis. 
     
     
         5 . The durable sander of  claim 1 , wherein the elastic buffer section is formed in an arched shape. 
     
     
         6 . The durable sander of  claim 1 , wherein the elastic buffer sections are mirrored about a symmetrical axis. 
     
     
         7 . The durable sander of  claim 1 , wherein the oscillation buffer element includes a plurality of first elastic buffer sections and a plurality of second elastic buffer sections which are respectively mirrored about a symmetrical axis. 
     
     
         8 . The durable sander of  claim 1 , wherein the buffer portions are located on a same plane. 
     
     
         9 . The durable sander of  claim 1 , wherein the elastic buffer section is formed at a width increased from the first connection end towards the second connection end. 
     
     
         10 . The durable sander of  claim 1 , wherein the first connection end is formed at a width smaller than that of the elastic buffer section, and the width of the elastic buffer section is smaller than that of the second connection end. 
     
     
         11 . The durable sander of  claim 1 , wherein the buffer portion at an outer side of the oscillation buffer element is formed at a width greater than that of the buffer portion in the center of the oscillation buffer element. 
     
     
         12 . The durable sander of  claim 1 , wherein the upper connection bar and the lower connection bar of the oscillation buffer element respectively include a first hole and a second hole run through by a fastening element which is screwed on the body or the sanding disk. 
     
     
         13 . The durable sander of  claim 12 , wherein the body includes a housing to hold the drive motor, the housing including a first fastening hole corresponding to the first hole and run through by the fastening element. 
     
     
         14 . The durable sander of  claim 12 , wherein the sanding disk includes a support frame and a sanding portion fastened to the support frame, the support frame including a second fastening hole corresponding to the second hole and run through by the fastening element. 
     
     
         15 . The durable sander of  claim 1 , wherein the drive motor includes a shaft connected to the sanding disk. 
     
     
         16 . An oscillation buffer element installed on a sander which includes a body with a drive motor and a sanding disk driven by the drive motor to perform sanding movement against the body, comprising:
 an upper connection bar fastened to the body;   a lower connection bar fastened to the sanding disk; and   a plurality of buffer portions bridging the upper connection bar and the lower connection bar in an integrated manner, each of the plurality of buffer portions including a first connection end connected to the upper connection bar, a second connection end connected to the lower connection bar and an elastic buffer section interposed between the first connection end and the second connection end, the elastic buffer section being formed at a length greater than a distance between the first connection end and the second connection end.   
     
     
         17 . The oscillation buffer element of  claim 16 , wherein the first connection ends of the buffer portions are connected to each other and the second connection ends of the buffer portions are connected to each other. 
     
     
         18 . The oscillation buffer element of  claim 16 , wherein the first connection ends of the buffer portions are separated from each other and the second connection ends of the buffer portions are separated from each other. 
     
     
         19 . The oscillation buffer element of  claim 16 , wherein the first connection end and the second connection end of each buffer portion are located at a same vertical axis, the elastic buffer section of each buffer portion including at least one deviation section away from the vertical axis. 
     
     
         20 . The oscillation buffer element of  claim 16 , wherein the elastic buffer section is formed at an arched shape. 
     
     
         21 . The oscillation buffer element of  claim 16 , wherein the elastic buffer sections are mirrored about a symmetrical axis. 
     
     
         22 . The oscillation buffer element of  claim 16  further including a plurality of first elastic buffer sections and a plurality of second elastic buffer sections which are respectively mirrored about a symmetrical axis. 
     
     
         23 . The oscillation buffer element of  claim 16 , wherein the buffer portions are located on a same plane. 
     
     
         24 . The oscillation buffer element of  claim 16 , wherein the elastic buffer section is formed at a width increased from the first connection end towards the second connection end. 
     
     
         25 . The oscillation buffer element of  claim 16 , wherein the first connection end is formed at a width smaller than that of the elastic buffer section, and the width of the elastic buffer section is smaller than that of the second connection end. 
     
     
         26 . The oscillation buffer element of  claim 16 , wherein the buffer portion at an outer side is formed at a width greater than that of the buffer portion in the center.