Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1985-11-26
1988-10-11
Schmidt, Frederick R.
Tools
Wrench, screwdriver, or driver therefor
Machine
81 5719, 137491, 251 26, B25B 1300
Patent
active
047762438
ABSTRACT:
A power tong assembly wherein a safety latch mechanism includes a power part equipped with two outlet side connections, one of which is connected to a control part for controlling the opening cross section of the tank side connection. The power part has a control element in the form of a piston-shaped valve body with equal sized surfaces on both end faces subject to the pressure of the working medium and with a bore running in the direction of the valve body movement. This bore has a conical extension of its inlet flow end. This blocks the direct connection of the supply with the return to the tank.
REFERENCES:
patent: 2780950 (1957-02-01), Province
patent: 3174410 (1968-09-01), Booth
patent: 3677287 (1972-07-01), Morris
patent: 3921473 (1975-11-01), Boyadjieff
patent: 4170907 (1979-10-01), Cathcart
Bock Hans-Christian
Schulze-Beckinghausen Jorg
Schmidt Frederick R.
Vaught Bradley I.
Weatherford / Lamb, Inc.
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