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. 16, 2021
Filed:
Apr. 27, 2016
Sekisui Chemical Co., Ltd., Osaka, JP;
Hiroshi Sugahara, Shiga, JP;
Tatsurou Baba, Shiga, JP;
Yoshirou Sugiyama, Shiga, JP;
Masahiro Yamasaki, Tokyo, JP;
Junichi Nagatsuka, Shiga, JP;
SEKISUI CHEMICAL CO., LTD., Osaka, JP;
Abstract
A spiral pipe () is formed by joining edges of adjacent turns of a strip member () while helically winding the strip member using a pipe-making apparatus. A propulsive reaction force for moving in a winding direction of the strip member is imparted to a following strip portion () or a preceding spiral pipe portion () of the strip member by a propulsive reaction force imparting portion of the pipe-making apparatus. The following strip portion follows a preceding spiral pipe portion that has already been made into a pipe. A resisting force in a direction opposite to the propulsive reaction force is imparted to the strip member along the winding direction by a friction between a resisting force imparting portion and the strip member generated while the strip member is moved forward. In this arrangement, a diameter limiting frame can be omitted, and thereby, the pipe-making apparatus can be downsized.