US 12,000,507 B2
Pipe, spool forming die, and pipe manufacturing method
Daisuke Izumikawa, Aichi (JP); Mikuto Wakayama, Aichi (JP); Masahito Hosoi, Aichi (JP); and Takashi Sumiya, Aichi (JP)
Assigned to FUTABA INDUSTRIAL CO., LTD., Aichi (JP)
Filed by FUTABA INDUSTRIAL CO., LTD., Aichi (JP)
Filed on May 26, 2021, as Appl. No. 17/330,991.
Claims priority of application No. 2020-114147 (JP), filed on Jul. 1, 2020.
Prior Publication US 2022/0003341 A1, Jan. 6, 2022
Int. Cl. F16L 13/14 (2006.01)
CPC F16L 13/141 (2013.01) [F16L 2013/145 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A pipe extending from a first side toward a second side, the pipe comprising:
a side wall separating an inside and an outside of the pipe; and
a spool that is a part of the side wall formed bent so as to protrude from an outer circumferential surface of the pipe and extending to surround the outer circumferential surface,
the spool comprising:
a first portion located on the first side; and
a second portion located on the second side,
wherein there is a clearance between the first portion and the second portion in a top region that comprises an outer circumferential end of the spool,
wherein the first portion and the second portion substantially abut each other in a base region located between the top region and a region of the side wall around the spool,
wherein the spool is formed at a distance from an opening of the pipe on the second side,
wherein the first portion in the top region comprises a straight part that extends planarly, wherein the straight part is formed in the top region and the base region,
wherein the second portion in the top region is bent to expand toward the second side relative to the second portion in the base region,
wherein the pipe comprises a first section, a second section, and a boundary portion, the second section including the opening on the second side, and the boundary portion being situated between the first section and the second section,
wherein the first section and the second section are different in diameter of a cross section perpendicular to a longitudinal direction of the pipe,
wherein the spool is disposed in the second section at a distance from the boundary portion, and
wherein, in the second section, a diameter of the cross section of a portion of the pipe adjacent to the spool on the first side is substantially identical to a diameter of the cross section of a portion of the pipe adjacent to the spool on the second side.