Patent ID: 6178804
Filing Date: 2001-01-30
Classification: B21D,B21J,B23D,B26D,B30B,Y10T

Abstract:
An improved top die raising and lowering guide mechanism for punching, pressing, and shearing machines comprised of three sets of hydraulic cylinders installed in a triangular configuration at the upper extent of a punching, pressing, or shearing machine, with upper and lower locating seats mounted to the top and bottom ends, respectively, of the said hydraulic cylinder sets in the said machine; and formed inside the said upper and lower locating seats are oil passages connected to the said three hydraulic cylinder sets and said upper and lower oil passages connected to the respective oil feed lines of a hydraulic system which carries hydraulic fluid simultaneously to and from each of the said hydraulic cylinders; furthermore, the exposed ends of the piston rods of the said three hydraulic cylinder sets are conjoined to an attachment mount, and since the said piston rods are conjoined to the said attachment mount in a triangular configuration based on the principles of a plane triangular forms, the said attachment mount provides for the mounting of a top die which is raised and lowered as driven by the said three of piston rods sets.