Overload protector for press machine

Details Overload protector for press machine Overload protector for press machine

1990-05-07

1992-01-07

Larson, Lowell A.

Metal deforming

Tool and/or tool holder

Including flexible or yieldable tool or support

7245313, 100 53, B21B 2500, B30B 1514

Patent

active

050780034

ABSTRACT:
An overload protector for press machine protects a press machine from a damage when the press machine receives an overload in operation. It is applicable to a two-point type press machine with two connecting rods between a crank shaft and a slide. A pressurized oil supply means comprising a pressure generator and pressure oil supply line delivers pressurized oil to two hydraulic pressure chambers of two overload-protections means. The pressurized oil supply line has two relief valves connected thereto in hydraulic parallel to each other. Each of the relief valves receives the hydraulic pressure from one of the hydraulic pressure chambers reduced by an occurrence of a localized load and releases the hydraulic pressure contained in the other hydraulic pressure chamber so as to nullify the localized load.

REFERENCES:
patent: 2937733 (1960-05-01), Dunly
patent: 3426873 (1964-02-01), Tezuka
patent: 3955396 (1976-05-01), Carrieri

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