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:
Jul. 21, 1992
Filed:
Apr. 12, 1991
Applicant:
Inventor:
Robert F Miller, Lafayette, CA (US);
Assignee:
Pacific Roller Die Co., Inc., Hayward, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16L / ;
U.S. Cl.
CPC ...
285364 ; 285903 ; 285414 ; 285401 ;
Abstract
A coupling and methods for interconnecting the ends of spirally ribbed pipe are disclosed. Grooves are formed transversely across two or more ribs of the pipe and a coupling ring is secured to the end of the pipe by lugs or cleats which rotatably engage with the grooves. Contact surfaces of the lugs are angled relative to the grooves to center the coupling ring axially of the pipe. The angular relationship of the grooves and contact surfaces of the lugs draw the ring into abutting contact with the end of the pipe as they rotatably engage the grooves.