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:
Feb. 06, 1990
Filed:
Nov. 18, 1988
Peter Froehlich, Neuried, DE;
Hilti Aktiengesellschaft, , LI;
Abstract
An expansion dowel assembly includes an axially extending anchor bolt and an expansion sleeve laterally enclosing the bolt. At its leading end, the anchor bolt has an expansion cone displaceable opposite to the insertion direction of the dowel assembly relative to a conically shaped expansion region at the leading end of the sleeve. Initially, the cone angle of the expansion cone is larger than the cone angle of the expansion section of the sleeve. A circumferentially extending annular bead is located on the outer circumferential periphery of the expansion region. The expansion region is slotted in the axial direction and its wall thickness decreases in the circumferential direction toward the slots. At the outset of the sleeve expansion, it is greatly widened and the annular bead is pressed into the surface of the borehole in which the dowel assembly is inserted. As a result, a positive locking engagement is provided between the expansion sleeve and the receiving material in which the borehole is formed, so that the dowel assembly can be utilized in a cracked-prone tensile zone of the receiving material.