Patent ID: 6339978
Filing Date: 2002-01-22
Classification: B25B

Abstract:
An open-ended wrench comprising:a wrench handle; a fixed clamping jaw rigidly connected to the handle; and a spring-loaded movable clamping jaw pivotably mounted to the fixed jaw at a pivot point; the fixed jaw including a fixed clamping surface, and the movable clamping jaw including a movable clamping surface disposed generally opposite the fixed clamping surface, the fixed and movable clamping surfaces together forming a cavity for receiving a workpiece; the fixed clamping surface including a plurality of convexly curved fixed clamping teeth, wherein adjacently disposed ones of the fixed teeth are separated by a notch, the plurality of fixed teeth including a pair of front and rear convexly curved fixed clamping teeth disposed adjacent a mouth of the cavity and oriented such that peaks of the front and rear fixed teeth together define a fixed clamping surface, the front fixed clamping tooth being disposed closer to the mouth than is the rear fixed clamping tooth; the movable clamping surface including a plurality of convexly curved movable clamping teeth, wherein adjacently disposed ones of the movable teeth are separated by a notch, the plurality of movable teeth including a pair of convexly curved front and rear movable clamping teeth disposed adjacent the mouth of the cavity and oriented such that peaks of the front and rear movable teeth lie on a reference line which terminates at a termination point disposed at a peak of the rear movable tooth, an imaginary line extending from that termination point to the pivot point forms an angle not greater than about ninety degrees with the movable clamping surface; the movable jaw including a concavely curved recess extending from a rear end of the rearwardmost one of the plurality of movable teeth to a location adjacent the pivot point.