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:
May. 31, 1977
Filed:
Aug. 11, 1975
Applicant:
Inventors:
Assignee:
Nippon Concrete Industries Co. Ltd., Tokyo, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16L / ;
U.S. Cl.
CPC ...
285 45 ; 285286 ; 285288 ;
Abstract
This invention relates to connected parts of a long concrete pipe made by connectng some short concrete poles or concrete piles which are separately manufactured. Especially in case that a bending moment acts on an upper part of a concrete pipe having connected parts, in order to increase the strength of the connected part against the bending moment an annular concave part is made on the outer periphery of the joined part of end plates which are fixed to reinforcements at the ends of concrete pipes, and a reinforcing split ring is inserted into the said concave part and is welded to the said end plates.