Fluid actuated, double acting machine for punching, cutting, ben

Details Fluid actuated, double acting machine for punching, cutting, ben Fluid actuated, double acting machine for punching, cutting, ben

1992-09-02

1994-02-01

Jones, David

Metal deforming

With means to drive tool

Including pneumatic- or fluid-actuated tool support

7245316, 30180, 29751, B26B 1700

Patent

active

052823784

ABSTRACT:
A hydraulic punching machine is disclosed which has a casing having formed therein a piston chamber in which a piston is reciprocably mounted to define a pair of opposed fluid chambers, and a fluid reservoir for containing a hydraulic fluid. The piston has a piston rod carrying a punch for movement into and out of engagement with a die on the casing. Also mounted to the casing is a motor driven pump for pressurizing the fluid. A solenoid actuated spool valve alternately places the fluid chambers in communication with the pump and with a fluid drain. The solenoid is connected to an electric control circuit capable of sensing the extension and contraction of the piston rod. Therefore, upon extension of the piston rod, with the consequent creation of a punch in the work such as sheet steel, the control circuit cases the spool valve to automatically contract the piston rod under fluid pressure.

REFERENCES:
patent: 3165140 (1965-01-01), Hazelton
patent: 3733699 (1973-05-01), Bock
patent: 4382331 (1983-05-01), Kimura
patent: 4936126 (1990-06-01), Sato
patent: 5111681 (1992-05-01), Yasui et al.
patent: 5152162 (1992-10-01), Ferraro et al.
patent: 5195354 (1993-03-01), Yasui et al.

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