Rear reservoir micro sandblaster

Claim 1

A lightweight, hand held apparatus for abrading, polishing, cleaning, or etching the surface of an object with a stream of fluid containing a mixture of pulverulent material and a gaseous medium, comprising a hollow elongated tube constituting a handle and a nozzle having at least one orifice to discharge the afor stream of fluid against the surface, a vortex mixing chamber for mixing the gaseous medium and pulverulent material, a means of receiving a compressed gas flow and urging the gaseous flow into the vortex mixing chamber, an air and pulverulent material receiving member disposed at one end of the tube for receiving an air supply line and a pulverulent supply line, a pulverulent supply reservoir, and a means to control the flow of the pulverulent material and gaseous medium mixture, wherein the means to control the flow of the pulverulent material and gaseous medium mixture comprises a pinch lever disposed inside the hollow elongated tube, wherein the pinch lever comprises a first portion, substantially parallel to the hollow elongated tube, connected to a pinch lever button at one end and to a second portion at the other end; the second portion is disposed at an angle relative to the first portion and the connection between the first and second portions form a pivot point against the inner wall of the hollow elongated tube; the second portion is connected to a third portion wherein the third portion is disposed at an angle relative to the second portion; the third portion consists of a rounded end portion to pinch the air supply line when the pinch lever button is depressed and a passageway to allow the pulverulent supply line to pass through the third portion to prevent the pulverulent supply line from being pinched.