The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 12, 1991
Filed:
Nov. 16, 1989
Shigeyuki Matsumoto, Ibaraki, JP;
Tomoyoshi Kawamura, Saitama, JP;
Benkan Corporation, , JP;
Abstract
In a vent-free single-duct drainage piping system for vertical installation in multi-storied buildings with horizontally extending branches to receive drain from sources of different floors of the building installed, a joint for connecting vertical pipe sections of the drainage piping system is disclosed, which comprises an upper pipe portion having a spiral axis between opposite end portions thereof and adapted for connection to the upstream side of the vertical drainage system to receive drain therfrom. A lower pipe portion is comprised of a first vertical passage connected in direct fluid flow relationship with the upper pipe portion and a second vertical passage having at a side thereof side ports adapted for connection to horizontal drainage pipes laid at a particular floor of the building. The first vertical passage receives drain from the upper pipe portion and the second vertical passage receives drain from the horizontal pipes. Both first and second passages merge at lower ends thereof into a common outlet port adapted for connection to the downstream side of the system. The helix of the upper pipe section is provided to reduce the velocity of the drain falling from the drainage system, thereby lessening pulsations and sounds developed in drain water.