# US 5,706,529 A · Water closet > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,706,529 A - Document ID: US5706529A - Status: Granted - Kind: A - Application number: 08/633,656 - Filed: 1996-04-17 - Granted: 1998-01-13 - Earliest claimed: 1987-09-16 - Assignees: Toto Ltd. - Inventors: Yoshio Kai; Toshifumi Yoneda - Web page: https://patentgrep.com/patent/US5706529A ## CPC - E03D 11/02: Water-closet bowls (auxiliary chambers with connections to flushing water for bowl-cleaning utensils E03D9/06; modified for using upwardly-directed sprays E03D9/08; seats or covers A47K13/00 ){; Bowls with a double odour seal optionally with provisions for a good siphonic action; siphons as part of the bowl (parts or details of bowls E03D11/13)} - E03D 1/28: Bowl integral with the flushing cistern - E03D: WATER-CLOSETS OR URINALS WITH FLUSHING DEVICES; FLUSHING VALVES THEREFOR ## Abstract A water closet having a trap drainage exit in a wall above a floor, in which at the time of flushing, a vent space is partitioned in a wall-like manner by water falling from a weir. A rise in the water level of a sump portion of the trap results, and air within the trap is quickly forced toward the drainage exit side by the force of the water flow to cause the interior of the trap drainage to have a decreased pressure so that siphon action easily occurs. When the feed rate of water from a tank slows, to terminate the siphon action, air is promptly introduced into the siphon area from a notch in a partitioning wall, whereby the air introduction is hastened and the siphon effect is terminated quickly. ## Claims ### Claim 1 A water closet comprising: a flushing tank; a water closet body including a bowl portion, wherein said flushing tank is formed integrally with said bowl portion and at least a portion of said tank extends below an upper portion of said bowl portion, said water closet further comprising: a feed chamber which feeds water from said flushing tank to said bowl portion, said feed chamber interconnecting with said flushing tank substantially intermediately heightwise of said flushing tank; a trap drainage formed continuously with said bowl portion and having a drain hole, said drain hole of said trap drainage and a rear wall of said closet body being positioned substantially in a same plane with a rear surface of said flushing tank, and said trap drainage further comprising a sump portion downstream of a weir portion, and a partitioning wall on an upper wall above said sump portion; wherein said partitioning wall creates a slight vent space between said upper wall and a water surface of said sump portion. ### Claim 2 (depends on 1) A water closet as recited in claim 1, wherein a portion of said trap drainage extends substantially horizontally from said drain hole and said rear wall surface of said closet body. ### Claim 3 (depends on 1) A water closet as recited in claim 1, wherein said rear wall surface is defined by a substantially vertically extending rear wall, said drain hole being formed in said rear wall above the floor upon which said water closet is supported. ### Claim 4 (depends on 1) The water closet of claim 1, a substantial portion of said integral flushing tank extending below an upper portion of said bowl portion. ### Claim 5 (depends on 1) The water closet of claim 1, wherein said drain hole is located beneath said flushing tank. ### Claim 6 (depends on 1) The water closet of claim 1, wherein said drain hole is formed in said rear wall of said closet body substantially intermediate of a lower end of said flushing tank and a bottom surface of said closet body which is adapted to be supported by a floor surface. ### Claim 7 (depends on 1) A water closet as recited in claim 1, further comprising: a discharge opening bored in a bottom side of said bowl portion for delivering a majority of the flushing water stored in said flushing tank to a bottom area of said bowl portion. ### Claim 8 (depends on 7) A water closet as recited in claim 7, wherein said discharge opening spirally supplies flushing water to said bottom area of said bowl portion. ### Claim 9 (depends on 7) A water closet as recited in claim 7, further comprising: a water guide passage provided outside of said bowl portion, said water guide passage connecting said flushing tank with said discharge opening. ### Claim 10 (depends on 1) A water closet as recited in claim 1, further comprising: a rim water passage provided along an upper edge of said bowl portion. ### Claim 11 (depends on 1) A water closet as recited in claim 1, wherein said partitioning wall further comprises an air admitting notch at a lower portion thereof. ### Claim 12 A water closet in which a flushing tank is formed integrally with a bowl portion of a water closet body, and a feed chamber which feeds water from said flushing tank to said bowl portion, said feed chamber interconnecting with said flushing tank substantially intermediately heightwise of said flushing tank, wherein at least a portion of said tank extends below an upper portion of said bowl portion, said water closet comprising a trap drainage formed continuously with said bowl portion and having a drain hole formed in a rear wall of said closet body substantially intermediate of a lower end of said flushing tank and a bottom surface of said closet body which is adapted to be supported by a floor surface, said drain hole of said trap drainage and said rear wall of said closet body being positioned substantially flush with a rear surface of said flushing tank, and said trap drainage further comprising a first rearwardly extending portion starting at a bottom of said bowl portion and extending rearwardly and upwardly from said bowl portion, a second portion connected to and extending substantially vertically downwardly from said first portion and extending into a third portion, said third portion connected to said second portion and comprising a sump portion at an end of said third portion connected to said second portion, said drain hole provided at an end of said third portion remote from said bowl portion of said water closet, wherein said second portion has a diameter that narrows from a first end adjacent said first portion towards a second end adjacent said third portion, and further comprising a partitioning wall on an upper wall above said sump portion; wherein said partitioning wall creates a slight vent space between said upper wall and a water surface of said sump portion; said partition wall being provided with an air admitting notch at a lower portion thereof, said trap drainage having first and second water seals provided at the juncture of said first and second portion of said trap drainage and at said partitioning wall, said drainage hole from said third portion of said trap drainage having a generally continuous periphery. ### Claim 13 (depends on 12) A water closet as recited in claim 12, further comprising: a rim water passage provided along an upper edge of said bowl portion. ### Claim 14 A water closet comprising: a bowl portion having a horizontal rim surface and a water exit opening at a lower portion of said bowl portion; a trap drainage; and a drain hole formed in said water closet, wherein said trap drainage comprises: an upper portion extending from said water exit opening; a sump portion connecting to said drain hole; an intermediate portion interconnecting said upper portion and said sump portion, said intermediate portion including a weir portion connected to said upper portion at an entrance of said intermediate portion, said intermediate portion extending downwardly substantially perpendicular to said rim surface; and a partitioning wall extending downwardly from an upper wall of said sump portion and terminating at an end above a static water level in said sump portion, said partitioning wall creating a slight vent space between said partitioning wall end and said static water level across the entire width of said sump portion prior to initiation of a flush cycle. ### Claim 15 (depends on 14) A water closet as recited in claim 14, wherein said drain hole is formed in a side peripheral surface of a lower portion of said water closet, above a floor level thereof. ### Claim 16 (depends on 14) A water closet as recited in claim 14, further comprising: a flushing tank for supplying water to said bowl portion, said flushing tank comprising a drain hole located substantially vertically midway of said flushing tank.