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:
Nov. 13, 1984
Filed:
Feb. 22, 1983
Erwin Schiefer, Munich, DE;
Hilti Aktiengesellschaft, Schaan, LI;
Abstract
An expansion anchor assembly is made up of an anchor bolt and an expansion sleeve encircling and secured in an annular recess on the bolt. Adjacent the annular recess, the anchor bolt has a frusto-conical section. The expansion sleeve has diametrically opposite reduced thickness wall sections with a projection extending outwardly of the surface of the sleeve along each of the reduced thickness wall sections. When the expansion anchor assembly is inserted into a prepared borehole and the frusto-conical section is drawn into the sleeve, the sleeve breaks into axially extending sections along the reduced thickness wall sections and a uniform contact is provided between the sleeve section and the borehole surface.