Patent ID: 6442847
Filing Date: 2002-09-03
Classification: B21D,B26F

Abstract:
A portable punching machine comprising a pneumatic cylinder, said pneumatic cylinder comprising a piston rod, and a punching mechanism coupled to said piston rod of said pneumatic cylinder and driven by said piston rod to punch holes in a metal workpiece, wherein said punching mechanism comprises:a locating block fixedly fastened to said pneumatic cylinder, said locating block comprising at least one bottom notch, and a center through hole adapted to receive the piston rod of said pneumatic cylinder; an actuating block mounted on the piston rod of said pneumatic cylinder and adapted to move the workpiece to be processed relative to said locating block, said actuating block comprising a center through hole fastened to the piston rod of said pneumatic cylinder by a lock nut, at least one peripheral side notch for coupling to the metal workpiece to be processed, and at least one pair of guide holes aligned at two sides of said at least one peripheral side notch and respectively aimed at the at least one bottom notch of said locating block; and at least one punching tool assembly mounted in said locating block and said actuating block and driven by said actuating block to punch the metal workpiece being attached to the at least one side notch of said actuating block upon operation of said pneumatic cylinder, said at least one punching tool assembly each comprising a barrel mounted in one of said pair of guide holes of said actuating block, a set of spring washers mounted in said at least one bottom notch of said locating block, a punching rod mounted in said at least one bottom notch of said locating block and inserted through said set of spring washers and said barrel, and a punching die mounted on said one of said pair of guide holes of said actuating block and aimed at said barrel.