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:
Nov. 12, 1991
Filed:
Jul. 24, 1990
Frank Calandra, Jr, Pittsburgh, PA (US);
Jerry Frease, Lexington, KY (US);
Jennmar Corporation, Pittsburgh, PA (US);
Abstract
A delay stopper for use in a mine roof anchor is provided. A mine roof anchor has a threaded roof bolt and a threaded receiving member for the roof bolt whereby the roof bolt and the receiving member initially rotate as a unit to mix resin components that are placed in the bore hole in a destructible capsule above the roof anchor. When the roof anchor is placed in the bore hole, the destructible capsule is ruptured, and the components within the capsule are mixed to form resin which at least partially secures the mine roof anchor within the bore hole. The delay stopper causes the roof bolt and the threaded receiving member to rotate as a unit to mix the resin after the capsule ruptures. The delay stopper has a cylindrical body portion interfitting into the threads of the threaded receiving member and a conical end portion formed on the cylindrical body portion and extending axially from the body portion in a direction toward the end of the roof bolt. The delay stopper is preferably formed of an epoxy resin. A method of forming the delay stopper within the threads of the threaded receiving member is also provided.