Grinder

Abstract

A grinder includes an attachment base provided on a main body, which is rotatably retaining a spindle, and surrounding the spindle; a mating portion provided on the wheel guard and mated with the attachment base; a recessed portion provided on the attachment base; a protruding portion provided on the mating portion; and a plate spring disposed between the attachment base and the mating portion, and when the wheel guard is displaced in the radial direction of the spindle against bias of the plate spring, mating between the recessed portion and the protruding portion is canceled, and the wheel guard is turnable in the circumferential direction of the spindle. As a result, the possibility that fixation of the wheel guard is cancelled against the intention of an operator is reduced as much as possible.

1 . A grinder provided with a spindle to which a rotating tool is attached and a wheel guard covering the rotating tool attached to the spindle, the grinder comprising:
 an attachment base provided on a main body rotatably retaining the spindle, the attachment base surrounding the spindle;   a mating portion provided on the wheel guard and mated with the attachment base;   a recessed portion provided on either one of the attachment base and the mating portion; and   a protruding portion provided on the other one of the attachment base and the mating portion,   wherein when the wheel guard is displaced in a radial direction of the spindle, mating between the recessed portion and the protruding portion is cancelled, and   the wheel guard is turnable in a circumferential direction of the spindle.   
     
     
         2 . The grinder according to  claim 1 , comprising an elastic body disposed between the attachment base and the mating portion,
 wherein when the wheel guard is displaced in a radial direction of the spindle against bias of the elastic body the mating between the recessed portion and the protruding portion is cancelled, and   the wheel guard is turnable in the circumferential direction of the spindle.   
     
     
         3 . The grinder according to  claim 2 ,
 wherein the recessed portion is provided on an outer circumferential surface of the attachment base,   the protruding portion is provided on an inner circumferential surface of the mating portion, and   the elastic body is provided on the inner circumferential surface of the mating portion and at a position opposed to the protruding portion.   
     
     
         4 . The grinder according to  claim 3 ,
 wherein the elastic body is a plate spring curved toward an inner side of the mating portion.   
     
     
         5 . The grinder according to  claim 1 ,
 wherein the main body includes:
 a housing housing a drive source of the spindle; and 
 a gear case rotatably retaining the spindle, and 
   the attachment base is integrally formed with a cover member covering an opening of the gear case.   
     
     
         6 . The grinder according to  claim 1 , comprising:
 a projecting portion projecting inward from the inner circumferential surface of the mating portion; and   an engaging portion projecting outward from the outer circumferential surface of the attachment base and engaged with the projecting portion.   
     
     
         7 . The grinder according to  claim 6 ,
 wherein the recessed portion is provided on the attachment base, and   the engaging portion is provided in a region of the attachment base excluding a region in which the recessed portion is provided.   
     
     
         8 . A grinder provided with an output shaft to which a rotating tool is attached, a wheel guard covering the rotating tool, and an attachment base to which the wheel guard is attached, the grinder comprising:
 a recessed portion provided on either one of the wheel guard and the attachment base; and   a protruding portion provided on the other one of the wheel guard and the attachment base,   wherein the recessed portion and the protruding portion are mated with each other in a radial direction of the output shaft.   
     
     
         9 . The grinder according to  claim 8 , comprising an elastic body disposed between the wheel guard and the attachment base in the radial direction of the output shaft, and biasing either one of the protruding portion and the recessed portion toward the other one of the protruding portion and the recessed portion. 
     
     
         10 . The grinder according to  claim 9 ,
 wherein the wheel guard is provided with either one of the protruding portion and the recessed portion, the elastic body, and a perpendicular part covering a radial-direction outer side of the rotating tool, and   the perpendicular part is provided in a side in which the elastic body is provided in relation with the output shaft.   
     
     
         11 . The grinder according to  claim 10 ,
 wherein either one of the protruding portion and the recessed portion, and the elastic body are provided at symmetrical positions with respect to the output shaft.   
     
     
         12 . A grinder comprising:
 an output shaft to which a rotating tool is attached;
 a wheel guard provided with a mating portion and a perpendicular part covering the rotating tool; and 
   an attachment base to which the mating portion is attached,   wherein the wheel guard is movable from the mating-portion side to the perpendicular-part side, and   the mating portion and the attachment base are mated with each other in a moving direction of the wheel guard.   
     
     
         13 . The grinder according to  claim 12 , comprising:
 a recessed portion provided on either one of the mating portion and the attachment base; and   a protruding portion provided on the other one of the mating portion and the attachment base,   wherein the recessed portion and the protruding portion are disposed in an opposite side of the perpendicular part with respect to the output shaft.   
     
     
         14 . The grinder according to  claim 13 , comprising an elastic body biasing the wheel guard to the perpendicular-part side. 
     
     
         15 . The grinder according to  claim 13 , comprising an elastic body causing the recessed portion and the protruding portion to be mated with each other in a radial direction of the output shaft.