Power wrench

Tools – Wrench – screwdriver – or driver therefor – Machine

Patent

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Details

81 5744, 81 52, 173171, B25B 1346

Patent

active

045246513

ABSTRACT:
A power wrench operated with a pressure medium comprises a wrench head casing (10) which is engaged by a piston-cylinder unit (28,29). The other end of the piston-cylinder unit (28,29) is pressing against a support element (27) guided on a guideway (22) of the wrench head casing (10). The outer end (28) of the support element is applied to a stationary abutment. Upon rotating the wrench head (10) the ring (11) retaining the bolt or screw head is entrained by a ratchet (15) only in one sense of rotation, while the wrench head casing (10) is returned idly without entrainment of ring (11) in the other sense of rotation.

REFERENCES:
patent: 3955447 (1976-05-01), Parker
patent: 4201099 (1980-05-01), Junkers
patent: 4233865 (1980-11-01), Junkers

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