Portable sand blasting device - has spiral discharge chamber which receives air and entrained sand from outer end of impeller passageway

摘要

A portable sand blasting device comprising a housing adapted to be held and manipulated manually and to support an electric motor having a rotatable output shaft. An impeller is mounted on the motor output shaft and has an inlet opening communicating with an inlet chamber which receives air and entrained sand through a conduit extending to a sand pouch extending to a sand pouch adapted to be carried on the body of the operator. The impeller also has a number of radial passageways each of a circular configuration but with a somewhat 'V' shaped trailing wall. A spiral discharge chamber receives the air and entrained sand from outer end of the impeller passageways and conducts the same to a discharge opening and an associated nozzle. The discharge chamber has a 'V' shaped outer wall with the open end of the 'V' facing the impeller. An annular series of small apertures in a housing adjacent the impeller inlet chamber provides for the entry of additional ambient air and a rotatable disc above this has a similar annular seris of apertures. The disc may be rotated to align and to misalign the apertures in varying degrees to regulate the air flow.