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:
Sep. 17, 2002
Filed:
Nov. 20, 2000
Yoichi Kimura, Tokyo, JP;
Tokiwa Seiki Co., Ltd., Tokyo, JP;
Abstract
A method and apparatus for manufacturing a thick-walled bent pipe capable of manufacturing an elbow material for piping with higher size accuracy with use of a thick-walled pipe material are provided. For this purpose, the manufacturing apparatus includes a lower die ( ) including a pair of bottom dies ( ) having sliding surfaces ( ) in a circular arc form; an upper die ( ) including an upper guide ( ) having a guide surface ( ) in a circular arc form for guiding the lower die ( ), and a presser die ( ); and a lower guide ( ) having slide surfaces ( ) for placing the bottom dies ( ) thereon, and the bottom dies ( ) are respectively allowed to rotate while they are facing to each other, by lower end portions ( ) of the bottom dies ( ) respectively abutting to and sliding along the slide surfaces ( ) at the same time when the sliding surfaces ( ) respectively abut to and slide along the guide surface ( ) in the circular arc form in connection with descent of the upper die ( ).