Power tongs with hydraulic friction grip for speciality tubing

Details Power tongs with hydraulic friction grip for speciality tubing Power tongs with hydraulic friction grip for speciality tubing

1986-07-09

1987-12-15

Watson, Robert C.

Metal working

Means to assemble or disassemble

By rotation of work part

B25B 1350

Patent

active

047122846

ABSTRACT:
A power tong is disclosed having a pipe gripping device including plural jaws activated by independent expansible chamber linear motors. An air-driven hydraulic pump, whose output pressure is limited by an adjustable relief valve, supplies fluid to the jaw motors. The jaw force can thus be closely controlled, independent of tongs torque.

REFERENCES:
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patent: 2765136 (1956-10-01), Knapp
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patent: 3741517 (1973-06-01), Pagonowski
patent: 3796418 (1974-03-01), Carlberg
patent: 3921473 (1975-11-01), Boyadjieff et al.
patent: 4057887 (1977-11-01), Jones et al.
patent: 4092881 (1978-06-01), Jurgens et al.
patent: 4402239 (1983-09-01), Mooney
patent: 4523743 (1985-06-01), Wang

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