Patent ID: 6711977
Filing Date: 2004-03-30
Classification: B26D,Y10T

Abstract:
An improved structure of a portable plate circular arc punch shear comprising:a main frame; a housing covering said main frame and having a plurality of screw eyes; a handle provide on a top of said housing; a primary support provided one side of the housing, said primary support having a bottom with a space for accommodating a waste collection bin, said waste collection bin having a screw eye to receive a fixing bolt so as to fix said waste collection bin to said primary support; a plunger holder provided on a top of said primary support; a plunger vertically penetrating through a center of said plunger holder; a press plate pivotally mounted on said plunger holder; a driver mounted on said main frame and having a top end drivingly connected with an end of said press plate; an air valve mounted on said main frame and having a pull extending upwardly through said press plate, said air valve being connected to said driver via two connectors; and a punch shear dies unit mounted under said plunger holder on said primary support, said punch shear dies unit comprising a die holder, a lower die, a guide post and an upper die, said die holder having an accommodation hole, a return coil fitted in said accommodation hole, a plurality of holes extending through said die holder, said lower die having the same shape as said accommodation hole, a shear chute formed in a center of said lower die, multiple convex shear arc areas in various radii extending inwardly from an inner side of said shear chute, said guide post fitted in said shear chute of said lower die, multiple screw eyes and positioning pin holes being provided on a top of said guide post, said upper die being formed with fisheyes and positioning pin holes aligned with said screw eyes and positioning pin holes of said guide post, multiple concave shear arc areas formed on a circumference of said upper die; whereby when said pull is pressed, said air valve will drive said driver to lift an end of said press plate thereby depressing a lower end of said press plate and therefore pushing down said upper die to perform cutting operation.