Hydraulic power wrench

Tools – Wrench – screwdriver – or driver therefor – Machine

Patent

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Details

81 5724, 81 574, B25B 1346

Patent

active

047948256

ABSTRACT:
A split roller block assembly is interposed and captively retained between facing surfaces of the drive pin and drive piston rod disposed within the housing of a hydraulic power wrench. The assembly smoothly couples these two elements to substantially strengthen the interconnection therebetween to increase the useful life of the wrench. The wrench is additionally provided with a reaction arm portion which is removably connectable to the wrench housing in a multiplicity of rotational orientations relative thereto, the reaction arm being rotationally locked to the housing in each such orientation. Reverse rotation of the drive shaft portion of the wrench is precluded by a safety pawl and ratchet system mounted externally on the wrench housing. The safety system may be manually disengaged to permit such reverse shaft rotation in the event that the maximum wind-up force on a threaded fastener being tightened by the wrench occurs while the piston rod is in an intermediate position of its forward power stroke and the reaction arm is locked against an adjacent support surface. This permits the housing to be pivoted relative to the drive shaft to disengage the reaction arm from the support surface so that the wrench can be easily disengaged from the threaded fastener.

REFERENCES:
patent: 2491624 (1949-12-01), Shaff
patent: 4079641 (1978-03-01), Junkers
patent: 4200011 (1980-04-01), Wilmeth
patent: 4201099 (1980-05-01), Junkers
patent: 4233865 (1980-11-01), Junkers
patent: 4336727 (1982-06-01), Junkers
patent: 4368655 (1983-01-01), Junkers
patent: 4372181 (1983-02-01), Tinsley
patent: 4423649 (1984-01-01), Junkers et al.
patent: 4440046 (1984-04-01), Hirtsiefer et al.
patent: 4458563 (1984-07-01), Bickford et al.
patent: 4480510 (1984-11-01), Aparicio et al.
patent: 4513644 (1985-04-01), Weyer
patent: 4607546 (1986-08-01), Wagner

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