Patent ID: 7118463

Claim:
A sand blasting machine comprising a working chest and an air compressor, wherein: the working chest includes: a casing which has a housing chamber to hold a mesh and two sides for holding respectively a left glove operation means and a right glove operation means; a upper lid which is made of a transparent material and has an axle on one end to be hinged on one side of the casing and a latch element to fasten the upper lid and the casing when they are coupled and closed; a nozzle holding dock which includes a holding plate and a clipping plate; a nozzle which has an air outlet on a front end on a juncture of distal ends of an air tube and a sand tube; an air discharge filer device which has an air discharge port on an inner wall of the casing and a box coupling with the air discharge port from outside, the box being located outside the casing and having an air exit; and an actuation switch which is located on the inner wall of the casing close to the left glove operation means or the right glove operation means; the air compressor includes: an air compressor body which is driven by a motor to supply air and is connected to an air discharge tube to output the air; a return tube which surrounds the periphery of the air compressor and is a closed pipe formed by a hollow metal tube, and has an air intake end to couple with the air discharge tube and an air exit end on one side; and a foot frog which is coupled with the bottom of the air compressor body.