Patent ID: 8481877

Claim:
A dust-proof machine tool, comprising: a handgrip which includes an aperture to hold a driving switch movable up and down and a control bar hinged thereon to generate a pivotable stroke to press the driving switch, wherein the driving switch includes an insertion portion running through the aperture and a first butting portion extended from the insertion portion; a dust-proof cover including an opening run through by the insertion portion of the driving switch, an insertion hole formed on one side opposite to the opening, a press portion formed on the circumference thereof where the opening is located to press the handgrip and seal the aperture, and a second butting portion formed on the perimeter thereof where the insertion hole is located to butt the first butting portion such that the first butting portion is exposed outside the dust-proof cover; and an elastic element which is interposed between the driving switch and the dust-proof cover, and includes a first end butting an inner edge of the aperture and a second end normally pushing the second butting portion to contact with the first butting portion and brace the driving switch upwards.