Hand grinder

Abstract

A hand grinder comprises: a grinder main body, rotated by electricity or air and provided with a rotating body protrudingly formed at a central portion at a front end on one side; a fixed retainer having a center sleeve and a flange, wherein the center sleeve is screwed to a rotating shaft, the flanges are spaced apart and extend in the radial direction from the center sleeve, engaging grooves areformed on the sides of the respective flanges, and a space portion opening in the axial direction of the center sleeve is formed between the flanges; a disc holder having engaging projections projectingly formed on the inner peripheral surface to be inserted into the space portion to engage the engaging grooves; an abrasive disc coupled to the outer peripheral surface of the disc holder; and an elastic member to be located between the rotating body and the fixed retainer and embedded in the rotating shaft to elastically support the disc holder, the elastic member has an elastic body and a retaining ring, the elastic body is embedded in the rotating shaft, and one end is supported to the rotating body, and the lower surface of the retaining ring is supported to the other end of the elasticbody so that the retaining ring is embedded in the rotating shaft to elastically support the disc holder.

Description

technical field [0001] The invention relates to a hand grinder with quick and easy exchange of grinding discs. Background technique [0002] Usually, after primary machining of parts for shipbuilding and various industries, secondary machining is required for insufficiently machined parts or rough surfaces, or secondary machining is required before painting is performed. In the case of large parts or requiring high precision, use a grinding machine that rotates the grindstone at high speed to precisely grind the object, or in the case of small or not requiring high precision parts, mainly use light weight and convenient The manual grinder used performs grinding work on the surface of the object to be processed to make it smooth and easy to paint. [0003] This type of manual grinder is used to polish or grind the surface of the object to be processed by grinding the surface of the object to be processed with a grinding disc installed on the rotating shaft while the rotating...

AI Technical Summary

Problems solved by technology

[0005] However, in the conventional manual grinding machine as described above, when replacing the grinding disc, after unscrewing the nut fastened to the screw part formed on the rotating shaft, the grinding disc is separated from the rotating shaft, and the grinding disc is inserted into and fixed in sequence again. Rotate the shaft, and then tighten the nut to the screw part formed on the rotating shaft, so there is a problem that it takes a lot of time to replace the grinding disc and the work efficiency is low

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