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:
Feb. 17, 1987
Filed:
Mar. 29, 1984
Randall C Conner, Birmingham, AL (US);
Van T Walworth, Warrior, AL (US);
American Cast Iron Pipe Company, Birmingham, AL (US);
Abstract
A pipe joint is restrained against axial separation by the use of a bearing ring. Various embodiments of bearing rings having wedging surfaces cause an increase in the resistance to pipe separation as the joint separating thrust increases. That is, as the force tending to cause pipe separation increases, the wedging surface on the bearing ring cooperates with a corresponding wedging surface on a spigot ring to increase the resistance of the pipe joint to separation. The spigot rings are connected to the spigots by welding, set screws, heat-shrinking, etc. A specially shaped snap ring or bearing ring and associated method of making the bearing ring is used to avoid possible problems resulting from manufacturing tolerances. Specifically, the bearing ring is constructed with a major diameter greater than diameters at other locations on the ring.