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:
Jun. 02, 1981
Filed:
Mar. 08, 1979
Gusztav Lang, Munich, DE;
Peter Mauthe, Neu-Ulm, DE;
Hilti Aktiengesellschaft, Furstentum, LI;
Abstract
An expansion dowel formed of an axially extending metal sleeve has slots extending axially from its leading end for a portion of its length toward its trailing end. The bore through the sleeve consists of a threaded portion extending from the trailing end and a frusto-conically shaped portion extending from the threaded portion to the leading end of the sleeve. After the sleeve is inserted into a borehole in a receiving material it is anchored in the borehole by displacing a frusto-conically shaped cone through the frusto-conically shaped portion of the bore toward the leading end of the sleeve. The trailing end of the cone is located within the sleeve axially inwardly of the trailing ends of the slots. A flowable substance is injected into the bore of the sleeve so that it flows outwardly through the slots into the open spaces between the outside surface of the sleeve and the surface of the borehole. The flowable substance includes a material for protecting the sleeve against corrosion.