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:
Mar. 13, 1984
Filed:
Dec. 02, 1982
John E Martin, Springhouse, PA (US);
Other;
Abstract
A plug assembly which is resistant to loosening in response to thermal expansion and contraction is provided. The plug assembly comprises a deformable sleeve which is closed at one end and open at its opposite end to provide a chamber which receives a wedge slidable with respect to an expandable ring mounted in the chamber adjacent its open end. When pulled axially, the wedge expands the ring which, in turn, expands the sleeve radially outward into engagement with the inner wall of the item to be plugged. A retainer surrounds the out-pulled wedge and cooperates with a nut and threads on the wedge to tension the same and thereby apply continuous outward pressure to the sleeve. Preferably, the outer periphery of the sleeve is provided with a series of alternating edges and grooves which cut through any scale which may be present on the inner surface of the plugged item.