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:
Dec. 22, 1987
Filed:
Jul. 21, 1986
Arndt Bergner, Munich, DE;
Hilti Aktiengesellschaft, , US;
Abstract
An expansion anchor assembly for use in a borehole with an annular undercut includes a threaded anchor stud with a head part at its leading end inserted first into the borehole. Locking elements are arranged around the anchor stud at the head part, a conically shaped member is arranged to expand the locking elements in the radial direction, and an annular abutment member is in threaded engagement with the anchor stud and is arranged to axially displace the conically shaped member. By threading the abutment member toward the leading end of the anchor stud, the locking elements are displaced radially outwardly in the annular undercut. The radially outer surface of the abutment member is located within the axial projection of the radial outer surface of the conically shaped member. Accordingly, the abutment member and conically shaped member can be countersunk relative to a part to be secured to the material in which the borehole is formed. The extent of the countersink relative to the part varies according to the location of the annular undercut so that a complete anchoring of the part is ensured in every case.