Electro-hydraulic interface for a power tongs

Details Electro-hydraulic interface for a power tongs Electro-hydraulic interface for a power tongs

1977-03-15

1979-08-07

Michalsky, Gerald A.

Tools

Wrench, screwdriver, or driver therefor

Machine

81 5735, 91 32, 13759617, B25B 1350

Patent

active

041634012

ABSTRACT:
A manually operable valve in a power tongs assembly has, in combination therewith, an electro-hydraulic interface module. The interface module comprises an electrically responsive solenoid valve connected in hydraulically parallel path to the manually operated valve. The manually operated valve may be selectively disenabled and the electrically responsive valve simultaneously enabled to permit electrical control of the power tongs assembly.

REFERENCES:
patent: 2652812 (1953-09-01), Fenzl
patent: 3881375 (1975-05-01), Kelly

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