Power tongs and control system
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United States of America Patent
Stats
-
Apr 1, 1986
Grant Date -
N/A
app pub date -
Jul 10, 1984
filing date -
Jul 10, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A control system for power tongs comprises two tongs torque limiters, one of which limits tongs torque to a very low (hand-tight) level; the other limits torque at full makeup to, for example, 2000 ft. lb. The hand-tight torque limiter is manually or automatically disabled after the hand-tight level is reached. The system enables the operator to verify that the threads are properly engaged before applying full torque to the connection. The tongs have a very high reduction ratio, so that torque rises very slowly and can be more accurately controlled.
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Family
International Classification(s)
Cited Art Landscape
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