Flush toilet

Patent metadata

Field	Value
Publication number	US-9359753-B2
Application number	US-201414226431-A
Country	US
Kind code	B2
Filing date	Mar 26, 2014
Priority date	Mar 29, 2013
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

A flush toilet which including a bowl portion having a waste-receiving surface, a rim and a recess; a water spouting portion for spouting the flush water forwardly; and a drainage conduit. The recess of the bowl portion has a bottom below a pooled water level, and a wall surface connecting between the bottom and a lower edge of the waste-receiving surface, wherein the bottom of the recess has a front bottom surface and a rear bottom surface. The bowl portion is configured to allow flush water to form a major stream which is directed to flow from an front end of the bowl portion toward the inlet of the drainage conduit, and the rear bottom surface of the bottom is configured to allow a part of the major stream to collide therewith, and then guide the collided major stream to a front region inside the drainage conduit.

First claim

What is claimed is:

1. A flush toilet for flushing a toilet main unit with flush water supplied from a flush water source, to discharge waste, comprising:
a bowl portion having a waste-receiving surface, a rim located along an upper edge thereof, and a recess formed below the waste-receiving surface;
a water spouting portion for spouting the flush water toward a front end of the bowl portion so as to form a swirl flow which swirlingly flows along an inner peripheral surface of the rim; and
a drainage conduit having an inlet connecting with the recess of the bowl portion so as to discharge waste therethrough,
wherein the recess of the bowl portion has a bottom located below a pooled water level, and a wall surface connecting between the bottom and a lower edge of the waste-receiving surface, the bottom of the recess having a front bottom surface formed in a front region of the recess, and a rear bottom surface formed in a rear region of the recess,
and wherein:
the bowl portion is configured to allow flush water spouted from the water spouting portion to form a major stream which is directed to flow from the front end of the bowl portion toward the inlet of the drainage conduit; and
the rear bottom surface of the bottom of the recess is configured to allow a part of the major stream to collide therewith, and then guide the collided major stream to a front region inside the drainage conduit.

2. The flush toilet according to claim 1 , wherein the drainage conduit comprises: an introduction conduit portion connecting with the bottom of the recess, with an inner diameter approximately equal to that of the bottom, and extending rearwardly and obliquely downwardly; and a drainage trap conduit portion connecting with the introduction conduit portion and extending upwardly.

3. The flush toilet according to claim 1 , wherein the rear bottom surface of the recess is formed to incline inwardly and obliquely downwardly.

4. The flush toilet according to claim 3 , wherein the front bottom surface of the recess is formed to extend approximately horizontally.

5. The flush toilet according to claim 4 , wherein the front bottom surface of the recess is formed to be located above a lower end of the rear bottom surface.

6. The flush toilet according to claim 3 , wherein the recess is formed such that a wall surface in each of right and left lateral regions thereof becomes flush with an internal lateral surface of the drainage conduit, in an upward-downward direction.

7. The flush toilet according to claim 1 , wherein the inlet of the drainage conduit is formed in a shape in which a maximum width thereof in a lateral direction is greater than a maximum width thereof in a longitudinal direction, in top plan view.

8. The flush toilet according to claim 6 , wherein the drainage conduit is formed such that, in top plan view, the inlet thereof has a longitudinal center located rearward of a longitudinal center of a pooled water surface, and an area equal to or less than one-half of an area of the pooled water surface.

9. The flush toilet according to claim 1 , wherein the waste-receiving surface of the bowl portion is formed in an upwardly convex shape over an entire region thereof.

10. The flush toilet according to claim 1 , wherein the bowl portion is formed with a water guide channel for allowing flush water spouted from the water spouting portion to swirlingly flow along the inner peripheral surface of the rim, the water guide channel being formed to extend from the water spouting portion toward the front end of the bowl portion while gradually inclining downwardly and then extend rearwardly from the front end while gradually inclining upwardly.

11. The flush toilet according to claim 1 , wherein the drainage conduit comprises: an introduction conduit portion connecting with the bottom of the recess and extending rearwardly and obliquely downwardly; a rising conduit portion connecting with the introduction conduit portion and extending upwardly; and a lowering conduit portion connecting with the rising conduit portion and extending downwardly, wherein, on an assumption that, in a cross-section of the introduction conduit portion perpendicular to a central axis thereof, a region located below a line extending horizontally while intersecting the central axis is a lower region, and a region located above the line is an upper region, the introduction conduit portion is formed such that a cross-sectional area of the lower region is less than a cross-sectional area of the upper region, over an entire region ranging from an inlet thereof connecting with the bottom of the recess to an outlet thereof connecting with the rising conduit portion.

12. The flush toilet according to claim 11 , wherein the introduction conduit portion is formed such that a bottom of the cross-section thereof perpendicular to the central axis has a generally U shape.

13. The flush toilet according to claim 11 , wherein the rising conduit portion of the drainage conduit is formed such that a cross-sectional area thereof is greater than a smallest cross-sectional area of the introduction conduit portion.

14. The flush toilet according to claim 13 , wherein the drainage duct is formed such that, when a boundary point between the rising conduit portion and the lowering conduit portion is assumed to be a top of an internal upper surface of the rising conduit portion, a space for preventing occurrence of a siphon action is defined in a region above a position around the top.

Assignees

• Toto Ltd

Inventors

• Hirakawa Tomohiro
• Kitamura Masaki
• Kashirajima Shu
• Shinohara Yuki
• Kamei Koji

Classifications

• E03D2201/40

  Devices for distribution of flush water inside the bowl · CPC title

• E03D11/08 Primary

  Bowls with means producing a flushing water swirl · CPC title