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:
Dec. 09, 1980
Filed:
Jan. 25, 1979
David P Wagner, Geneva, IL (US);
Illinois Tool Works Inc., Chicago, IL (US);
Abstract
A fastener unit for clamping plastic material having a first predetermined thickness to a relatively thin sheet metal support having a second predetermined thickness. The fastener unit includes a spacer collar having a length substantially equal to the first predetermined thickness, the plastic having a hole to receive the collar. The collar surrounds the upper portion of a threaded shank and the end abuts the sheet metal. The spacer collar has an internal diameter which forms a gap with the threads of a size approximately equal to the second predetermined thickness. As the fastener is threadingly advanced into the sheet metal, the end of the collar serves as a fulcrum about which the threads bend the material which forms the edge of the hole into the gap increasing the stripping torque of the fastener unit.