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:
Aug. 31, 1976
Filed:
Jul. 07, 1975
Allan B Dove, Hamilton, CA;
Allen C Hunsberger, Waterdown, CA;
The Steel Company of Canada, Limited, Hamilton, CA;
Abstract
This invention provides a fastener which includes a shank having a head on one end and a conical portion on the other, the apex of the conical portion constituting a piercing point for the fastener. The shank includes a smooth cylindrical portion adjacent the conical portion and a threaded portion adjacent the head. The axial section of the fastener exhibits an abrupt, angled transition between the conical portion and the smooth cylindrical portion. The thread diameter of the threads on the threaded portion is greater than the diameter of the smooth cylindrical portion, which is the same as the base diameter of the conical portion. The thread angle of the threads is between about 35.degree. and about 55.degree., and the included cone angle of the conical portion is between about 23.degree. and about 35.degree..