Title:
PENETRATION DUCT MEMBER AND DUCT STRUCTURE OF HOLLOW WALL USING PENETRATION DUCT MEMBER
Document Type and Number:
WIPO Patent Application WO/2009/142123
Kind Code:
A1
Abstract:
Provided is a penetration duct member wherein airtightness can be maintained regardless of the state of a through hole in a hollow wall by intercepting the space in the wall reliably from the outside. On the outer circumference on one side of a pipe material (1) made of synthetic resin having flexibility and elasticity, an outer flange (4) is formed on the end side, an inner flange (5) forming an outer circumferential groove (3) having a width substantially equal to the thickness of an inner wall material (28) is provided integrally on the side closer to the center than the outer flange (4). On the outer circumference on the other side of the pipe material (1), an inner flange (6) is provided integrally at a part separated more than the hollow interval in the wall from the inner flange (5). An insertion guide portion (7) is formed on the side closer to the end than the inner flange (6). Inner circumferential grooves (8,9) spreading in the thickness of the inner flanges (5, 6) are formed, respectively, in the inner circumferential surface of both inner flanges (5, 6), and a bellows-shaped expansion and contraction portion (2) having a length longer than the interval of the inner and outer wall materials but short enough to be contained in the interval under contracted state and a thickness sufficient for recovering by deforming flexibly is formed between both inner flanges (5, 6).
Inventors:
ARAI, Akio (3094-202, Higashimine-choUtsunomiya-shi, Tochigi 44, 〒3210944, JP)
Application Number:
JP2009/058786
Publication Date:
November 26, 2009
Filing Date:
April 23, 2009
Export Citation:
Assignee:
ARAI, Akio (3094-202, Higashimine-choUtsunomiya-shi, Tochigi 44, 〒3210944, JP)
International Classes:
E04F17/04; F16L5/00
Attorney, Agent or Firm:
HIRAYAMA, Toshio (4-8-19-202, MotoimaizumiUtsunomiya-shi, Tochigi 54, 〒3210954, JP)