Portable hydraulic punch

Details Portable hydraulic punch Portable hydraulic punch

1995-05-04

1997-04-22

Jones, David

Metal deforming

With means to drive tool

Including pneumatic- or fluid-actuated tool support

7245318, 83DIG1, 192134, B21J 728

Patent

active

056220766

ABSTRACT:
A portable, hydraulically operated punch-die unit for fastening together sheet metal members without the use of separate fasteners. The unit is used in a hydraulic system utilizing a two-stage high pressure hydraulic pump having a retractor valve arrangement which allows the punch to be driven at high pressure and then retracted by generation of a vacuum. This eliminates the complexity of other ways of retracting the hydraulically driven punch, and the simplicity of the unit and the relatively few number of parts that comprise it, allow the unit to be made small and lightweight and thus easily handled.

REFERENCES:
patent: 3805658 (1974-04-01), Scott et al.
patent: 3811355 (1974-05-01), Cole
patent: 4030364 (1977-06-01), Atwood
patent: 4226109 (1980-10-01), Nilsson
patent: 4362196 (1982-12-01), Ferdinand et al.
patent: 4793591 (1988-12-01), Decker et al.
patent: 5282378 (1994-02-01), Kimura
patent: 5287723 (1994-02-01), Corcoran

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