Image Number 3 for United States Patent #5911801.
This wrench comprises an outer body (2) of elongate shape in which the head (1) of the wrench is articulated about a pivot (12); a plunger (3) that can move axially in the outer body and is urged towards the head by a preloaded spring (4); and at least a first rolling body (22) intended to reduce friction as the plunger moves. The rolling body (22) is a cylindrical roundel whose peripheral surface rolls on the one hand along a first flat track (16) secured to the outer body and which is pressed against this track when torque is applied, and on the other hand along a second flat track (20) formed on the plunger.
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