Wrench

Details Wrench Wrench

B - Operations, Transporting

25

B

81/25

B25B 21/00 (2006.01) B21B 21/00 (2006.01) B25B 21/02 (2006.01)

Patent

CA 2030473

A wrench comprising a housing inside which a reversible electric motor serving as a torque source and a torque transmitting mechanism connected thereto are disposed. The torque transmitting mechanism comprises a rotatable cylindrical main body having, rotatably fixed thereon, a coupling element with the rotation axis parallel but not co-linear with that of the main body. The main body with one end thereof connecting to the motor spindle is engageable with a follower shaft by means of the coupling element to transmit torque to a socket engaging with the follower shaft. An arrestor is provided to control the coupling element so that when the rotation speed of the main body exceeds a pre-specified value determined by the arrestor, the engagement between the main body and the follower shaft is enabled.

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