Powered back-up tongs
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United States of America Patent
Stats
-
Mar 11, 1986
Grant Date -
N/A
app pub date -
Jul 23, 1984
filing date -
Jul 23, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A powered back-up assembly is provided for securing a pipe against rotation. A plurality of heads are supported by a cage plate assembly, and are brought into gripping engagement with the pipe by rotating the cage plate assembly relative to a cam ring fixed to the body of the tong body. The cage plate assembly is rotated by a pair of hydraulic cylinders each connected at one end to a bar pivotably connected to the tong body. A third hydraulic cylinder interconnected between adjacent upper and lower tong bodies may be employed to achieve a reliable scissors tong, whereby the body of the upper tong is rotatable relative to the body of the lower tong.
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