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:
Sep. 25, 2001
Filed:
Sep. 18, 1998
Richard J. Ernst, Palatine, IL (US);
Sigismund G. Paul, Park Ridge, IL (US);
Edward D. Yates, Chicago, IL (US);
Illinois Tool Works Inc., Glenview, IL (US);
Abstract
An expansion anchor installable in a pre-drilled hole formed in a base material. The expansion anchor includes a bolt having a shaft with a head portion, an opposing end portion, and a threaded portion. A shoulder is disposed on the shaft intermediate the head portion and the end portion thereof, and an expandable sleeve is disposed about the shaft between the shoulder and the end portion of the shaft. The expandable sleeve has an expandable upper sleeve portion and an expandable lower sleeve portion wherein the expandable lower sleeve portion is expandable outwardly before the expandable upper sleeve portion is expandable outwardly. A nut having a substantially conical surface is fixed rotationally in the pre-drilled hole and is engagable with the threaded portion of the shaft. The substantially conical surface of the nut is engageable with the expandable lower sleeve portion so as to expand the lower sleeve portion until the nut is axially fixes in the pre-drilled hole. The advancing bolt is subsequently drawn into the pre-drilled hole and the shoulder of the shaft is engagable with the expandable upper sleeve portion so as outwardly expand to the upper sleeve portion, whereby the expandable upper and lower sleeve portions are engageable with the wall of the pre-drilled hole so as to retain the expansion anchor therein.