Patent ID: 7044033

Claim:
Clamping wrench for gripping a hexagonal object, the wrench comprising an upper wrench jaw and a lower wrench jaw, which are connected in a unitary manner respectively to a first handle and a second handle of the wrench, the wrench jaws being pivotably connected via a pivot to each other in a longitudinally adjustable joint, wherein: a) the upper wrench jaw ( 1 ) has a planar smooth clamping surface ( 9 ) and a stop surface ( 10 ) inclined to the clamping surface at an angle of 120 degrees for reception of adjacent flank surfaces of the hexagonal object upon insertion of the object between the jaws; b) the lower wrench jaw ( 2 ) has a convexly curved smooth clamping cam surface ( 11 ) protruding from the lower wrench jaw in a direction towards the upper wrench jaw, which protrusion lies on a side of a bisector of the upper jaw angle facing the pivot for engaging the hexagonal object upon emplacement of the object between the jaws, the protrusion extending along a region of the lower wrench jaw less than the extent of a flank of a hexagonal object to be inserted between the jaws; c) in cases of hexagonal objects ( 5 ) of differing widths across flats to be received by the wrench, points of action ( 12 a ) of the clamping cam surface ( 11 ) of the lower jaw lie in a front half of a lower flank surface ( 12 ) of the hexagonal object ( 5 ) being clamped by the jaws of the wrench upon insertion of the object between the jaws.