# US 12,000,131 B2 · Flush toilet

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- Number: US 12,000,131 B2
- Document ID: US12000131B2
- Status: Granted
- Kind: B2
- Application number: 17/884,769
- Filed: 2022-08-10
- Published: 2023-05-04
- Granted: 2024-06-04
- Earliest claimed: 2021-10-29
- Assignees: Toto Ltd.
- Applicants: Toto Ltd.
- Inventors: Yuichi Tsubone; Chisato Sone; Hiroshi Hashimoto; Yuya Miyake; Shigeru Okada; Kenichi Takano
- Web page: https://patentgrep.com/patent/US12000131B2

## CPC

- E03D 11/16: Means for connecting the bowl to the floor, e.g. to a floor outlet
- E03D 11/18: Siphons (for pipes in general F16L43/00, F16L45/00 {; if as part of the bowl E03D11/02; connecting the siphon to the bowl})
- E03D: WATER-CLOSETS OR URINALS WITH FLUSHING DEVICES; FLUSHING VALVES THEREFOR

## Abstract

A flush toilet includes a bowl part, a drainage water trap part that is connected to a bottom part thereof, and a water drainage socket that is connected thereto and includes a back side R part that changes a flow channel so that washing water flowing from an upper side is directed to a front side, a front side R part that is provided on a downstream side of the back side R part and changes a flow channel so that washing water flowing from a back side is directed to a lower side, a water storage part that stores a part of washing water on a flow channel from the back side R part to the front side R part, and a throttle part that is provided on a downstream side of the front side R part and decreases a cross-sectional area of a flow channel thereof.

## Claims

### Claim 1

A flush toilet, comprising:
a bowl part that includes a waste-receiving surface with a bowl shape and a rim part that is formed on an upper side of the waste-receiving surface;
a water spout part that is provided on the rim part and spouts washing water toward an inside of the bowl part;
a drainage water trap part that is connected to a bottom part of the bowl part and discharges waste in the bowl part; and
a water drainage socket that is provided with an upstream side that is connected to the drainage water trap part and a downstream side that is connected to a water drainage port of a floor surface where the water drainage socket includes a back side R part that changes a flow channel in such a manner that washing water that flows from an upper side is directed to a front side, a front side R part that is provided on a downstream side of the back side R part and changes a flow channel in such a manner that washing water that flows from a back side is directed to a lower side, and a water storage part that stores a part of washing water on a flow channel from the back side R part to the front side R part, wherein
the water drainage socket includes a throttle part that is provided on a downstream side of the front side R part and decreases a cross-sectional area of a flow channel of the front side R part, wherein
a center of a flow channel of the throttle part in a radial direction thereof is located on a front side of a center of a flow channel of a site where the throttle part is provided in the front side R part in a radial direction thereof.

### Claim 2 (depends on 1)

The flush toilet according to claim 1, wherein
the throttle part is provided at a position that is lower than that of a lower end part of the water storage part.

### Claim 3 (depends on 1)

The flush toilet according to claim 1, wherein:
the throttle part includes an opening part that forms a flow channel; and
the opening part includes a sloping surface that is formed on an inner peripheral surface thereof and slopes downward toward a downstream side.

### Claim 4 (depends on 1)

The flush toilet according to claim 1, wherein
the throttle part includes a rib that guides waste to a downstream side.

### Claim 5 (depends on 1)

The flush toilet according to claim 1, wherein
the throttle part includes:
an opening part that forms a flow channel; and
a protrusion part that protrudes from an inner peripheral surface of the opening part toward a side of a flow channel of the opening part.