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Title:
JOINT FOR DRAINAGE RISER
Document Type and Number:
WIPO Patent Application WO/2004/076909
Kind Code:
A1
Abstract:
A joint for a drainage riser, comprising: an inner tube (20) suspended downwardly from connecting opening (10) for an upper riser; a decelerating guide (21) downwardly decliningly and projectingly formed on the inner peripheral wall of said inner tube (20) and having a projecting end edge (21a) downwardly declining in a direction of the length thereof; and a turning guide (23) projectingly formed on the inner peripheral wall of a tapered tubular portion (15) and having a projecting end edge (23a) downwardly declining in a direction of the length thereof; the projecting end edge (21a) of said decelerating guide and the projecting end edge (21a) of said decelerating guide and the projecting end edge (23a) of said turning guide having horizontal projections formed opposed to each other and in substantially parallel to each other, and further, having vertical projections formed crossing each other, so that an air vent core can be appropriately formed in a drainage stream which flows down.

Inventors:
KOJIMA NORIATSU (JP)
KAWAMURA TOSHIHIKO (JP)
Application Number:
PCT/JP1993/001031
Publication Date:
September 10, 2004
Filing Date:
July 23, 1993
Export Citation:
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Assignee:
KOJIMA NORIATSU (JP)
KAWAMURA TOSHIHIKO (JP)
International Classes:
E03C1/122; F16L39/00; F16L41/02; F16L41/03; (IPC1-7): F16L41/02
Foreign References:
JPH0376941A1991-04-02
JPH0312846Y21991-03-26
JPH03177692A1991-08-01
JPS5249550Y21977-11-10
Attorney, Agent or Firm:
Iida, Kentaro (Sakae 2-chome Naka-k, Nagoya-shi Aichi 460, JP)
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