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. 03, 1979
Filed:
Dec. 13, 1977
Armin Herb, Peissenberg, DE;
Erwin Schiefer, Munich, DE;
Hilti Aktiengesellschaft, Schaan, LI;
Abstract
An expansion dowel includes a cylindrically shaped axially extending sleeve and a spreader for expanding the sleeve. The sleeve has a leading end and a trailing end and at least one axially extending slot formed in the sleeve. For at least a portion of its length, the slot has oppositely arranged sides converging in the direction of the leading end of the sleeve. The spreader fits into the part of the slot with the converging sides and has complementary converging sides to those in the slot. The spreader includes an impact piece against which impact force can be applied for axially displacing the spreader through the slot and expanding the sleeve.