| 摘要 |
PCT No. PCT/JP93/01031 Sec. 371 Date Mar. 11, 1994 Sec. 102(e) Date Mar. 11, 1994 PCT Filed Jul. 23, 1993.A drainage vertical tube joint comprising an inner tube (20) provided in hanging-down state at lower side of an upper vertical tube connection port (11), a reduction guide (21) provided in downward inclination on an inner circumferential wall of the inner tube (20) and having its projected end edge (21a) inclined downward in the length direction, a swivel guide (23) projected on an inner circumferential wall of a taper tube part (15) and having its projected end edge (23a) inclined downward in the length direction, wherein the projected end edge (21a) of the reduction guide and the projected end edge (23a) of the swivel guide are opposed and formed in parallel relation in projections of the horizontal plane and formed in intersection relation in projections of the vertical plane, and a ventilation core can be formed accurately in a flowing-down waste water flow.
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