US Patent 7882768 Manual wrench for actuating cylindrical elements

The invention relates to a manual wrench for actuating cylindrical elements. The inventive wrench comprises a fixed jaw (1) and a moving jaw (3) which are disposed on one end of a handle (2), whereby the fixed jaw (1) is secured with a transverse keyed assembly. The invention also includes an elastic pin (5) which extends through said keying. Moreover, the face of the fixed jaw (1) that faces the moving jaw (3) is equipped with a toothed section (7) comprising identical teeth which extend along a curved zone such as to define a single arc.