The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 27, 2000
Filed:
Dec. 21, 1998
Erik Sundstrom, Sandviken, SE;
Sandvik Aktiebolag, Sandviken, SE;
Abstract
A wrench includes an opening having a side wall defined by circumferentially alternating contact surfaces and recesses. Each recess includes a concave bottom surface and a pair of concave edge surfaces extending from respective ends of the bottom surface. The bottom surface has a radius of curvature larger than a radius of curvature of the edge surfaces and smaller than a distance from a center of the opening to a midpoint of the bottom surface, whereby a thickness of the wrench increases progressively on opposite sides of a midpoint of the bottom surface. Imaginary extensions of the contact surfaces disposed at opposite ends of each recess intersect one another substantially at the midpoint of the bottom surface.