Power tongs with hydraulic friction grip for speciality tubing
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United States of America Patent
Stats
-
Dec 15, 1987
Grant Date -
N/A
app pub date -
Jul 9, 1986
filing date -
Jul 9, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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Cited Art Landscape
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