Power tongs with improved hydraulic drive

Tools – Wrench – screwdriver – or driver therefor – Machine

Patent

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Details

B25B 1700

Patent

active

045935840

ABSTRACT:
Power tongs are described for making up and breaking apart joints of pipe. The hydraulic system of the tong comprises a tandem fluid motor which enables both forward and reverse operation of the tong in one of several selected speed/torque ranges by operating a pair of control handles. The open throat tong includes a door latching mechanism for automatically locking and unlocking the tong door when activating the tong hydraulic system. The tong dies come into gripping engagement with the pipe over a large composite arcuate angle to increase the pipe gripping ability of the tong.

REFERENCES:
patent: 4215602 (1980-08-01), Carstensen et al.
patent: 4357843 (1982-11-01), Peck et al.

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