Power wrench

Details Power wrench Power wrench

1990-03-30

1991-05-21

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Machine

B25B 1346

Patent

active

050165020

ABSTRACT:
A power wrench for tightening and loosening of threaded connectors comprises fluid operated drive units including a cylinder and a piston movable in the cylinder and having an end, engaging units arranged to engage and turn a threaded connector for tightening or loosening the latter, a ratchet-pawl mechanism including a ratchet provided in the engaging units and at least two pawls arranged to engage different teeth of the ratchet for turning the ratchet in opposite directions, and units for connecting the drive units witht he pawls and including at least two levers both pivotally connected to the end of the piston and turnable about different axes and each connected with a respective one of the pawls.

REFERENCES:
patent: 4409865 (1983-10-01), Krautter et al.
patent: 4644829 (1987-02-01), Junkers
patent: 4706526 (1987-11-01), Junkers
patent: 4706527 (1987-11-01), Junkers
patent: 4921010 (1990-05-01), Spirer

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