Title:
MULTIPLE TUBE
Document Type and Number:
Japanese Patent JP2021167657
Kind Code:
A
Abstract:
To suppress involvement or desertion of a middle layer when a corrugated tube is displaced to expose an end part of a tube body or the corrugated tube is returned while suppressing a cost increase in a multiple tube having the corrugated tube and the middle layer between the tube body and the corrugated tube.SOLUTION: A multiple tube 10 has: a tube body 12; a corrugated tube 20 which is tube-shaped, covers an outer periphery of the tube body 12, forms an annular mountain part projecting outward in a radial direction and an annular valley part 24 recessed outside in the radial direction by turns in an axial direction of the tube body 12 in a bellows shape, is stretchable in the axial direction while being guided to the outer periphery of the tube body 12; and a middle layer 14 which is arranged between the tube body 12 and the corrugated tube 20 and composed of unwoven fabric consisting of resin fibers, and is integrally connected to the corrugated tube 20 at least partially.SELECTED DRAWING: Figure 3
Inventors:
MASAKI TAKUAKI
Application Number:
JP2020071895A
Publication Date:
October 21, 2021
Filing Date:
April 13, 2020
Export Citation:
Assignee:
BRIDGESTONE CORP
International Classes:
F16L11/11
Attorney, Agent or Firm:
Patent Service Corporation Taiyo International Patent Office