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:
Apr. 11, 1989
Filed:
Jul. 28, 1987
David Weber, Elk Grove Village, IL (US);
Stanley Marchewka, Chicago, IL (US);
Hirsh Company, Skokie, IL (US);
Abstract
An improved threaded fastener is provided with a shank, a head connected to the shank, and a thread form on the shank terminating below the head. A plurality of lugs are provided above at least a portion of the thread form and are circumferentially disposed under the fastener head around the shank seriatim from a first lug to a last lug. Each lug defines an exposed engaging margin extending from the fastener shank at an acute angle relative to the longitudinal axis of the fastener. The maximum radial dimension of each lug progressively increases from the first lug to the last lug while a corresponding maximum axial dimension of each lug progressively decreases whereby the acute angle becomes progressively greater.