Patent ID: 6059639
Filing Date: 2000-05-09
Classification: B24C

Abstract:
A shot blast machine for cleaning workpieces, comprising:a frame;a device mounted to said frame for impelling abrasive particles;a first tumbler secured to said frame and having a first surface with an ingress and an egress for tumbling the workpieces in the path of said abrasive particles; anda second tumbler secured to said frame adjacent said first tumbler and having a second surface positioned significantly below said first level so as to receive workpieces exiting from said first surface and falling at the egress of said first surface onto the second surface at the ingress thereof, so as to further tumble said workpieces as a consequence of falling from said first tumbler to said second tumbler, said second tumbler having an ingress and an egress for even further tumbling the workpieces in a different direction as they are emerging from the first tumbler in the path of said abrasive particles;wherein said first and second surfaces form a downward step located at said egress of said first surface and at said ingress of said second surface to induce an additional tumble of the workpieces as they tumble from said egress of said first surface to said ingress of said second surface.