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. 09, 1976
Filed:
Nov. 26, 1973
Robert Walter Heisler, Somerville, NJ (US);
Johns-Manville Corporation, Denver, CO (US);
Abstract
A method of forming the bell end of a bell and spigot joint connecting two pipes together is disclosed herein and utilizes a mandrel assembly including an elongated core and a retractable ramp arrangement. A sealing gasket is positioned around the core and to one side of the ramp arrangement. Thereafter, an end section of a heat deformable pipe, heated to its deformable state, is moved concentrically over the core, retractable ramp arrangement and sealing gasket to form an enlarged sleeve or bell having an inner circumferential groove within which the sealing gasket is located. During this movement, as the heated end section approaches the sealing gasket, the ramp arrangement causes the end section to deform outwardly and over the gasket, whereupon the ramp arrangement retracts inwardly for allowing the outwardly deformed end section to shrink back to the core and around the gasket.