Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1984-07-23
1986-03-11
Jones, Jr., James L.
Tools
Wrench, screwdriver, or driver therefor
Machine
81 5719, 81 5739, B25B 1700
Patent
active
045746648
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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Eckel Manufacturing Co., Inc.
Jones Jr. James L.
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