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:
May. 21, 1985
Filed:
Mar. 18, 1982
Gerald D Barth, So. Elgin, IL (US);
Illinois Tool Works Inc., Chicago, IL (US);
Abstract
A rotary fastener is disclosed for use in attaching the first panel to a second panel. The fastener has a head and a shank, which shank has at least one helical thread thereon. Additionally, there is at least one helical ramp extending along the shank from the underside of the head. The underside of the head has a generally annular recess which may have helical ribs therein. The fastener is dimensioned so that as it is driven into the two panels, material of the two panels is drawn up into the recess and binds on the helical ramp along the shank. Additionally, a plurality of nibs located on the underside of the head and extending into the recess 'rake' up material as the underside of the head encounters the top panel, which raked material is also drawn into the recess and binds on the helical ramp. This combined binding action by panel material and raked material significantly increases stripping torque of the fastener during installation.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile