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:
Jul. 20, 1976
Filed:
Feb. 26, 1974
Sixten H Lejdegard, Ramnas, SW;
Bulten-Kanthal Aktiebolag, , SW;
Abstract
The wrenching portion of a nut or a bolt head is provided with a configuration which, when viewed in plan, comprises an outer cylinder having a plurality of grooves defined in part by re-entrant concave surfaces and equiangularly spaced about its periphery, the regions of intersection of the grooves with the outer cylinder being planar. The grooves may be altogether part-cylindrical in cross section, or may they have a part-cylindrical bottom surface which merges with two planar inclined side surfaces. Also disclosed is a matrix or die for use in manufacture of nuts or bolts having a splined wrenching portion, said matrix or die having a die cavity adapted to form the regions of intersection of the grooves with the outer cylinder as planar surfaces.