A helical drain for a toilet is disclosed. The present invention relates to a novel toilet drain configuration. Specifically, the novel toilet drain configuration comprises a helical loop trapway. The drain of the present invention exits the toilet bowl and forms a substantially vertical tubular loop running generally parallel to the width of the bowl or stool, or perpendicular to the longitudinal axis of the bowl or stool, before being connected to a sewer. The drain of the present invention functions like a P-trap syphon in removing the contents of the bowl. The diameter of the looped tubular portion of the drain may vary by approximately 20 percent or less in the direction of the sewer connection. Sensors may be placed on the drain to monitor drain contents, fluid levels, and drain performance. The drain may be fitted with valves to control the flow of fluids and gases through the drain.

A flush toilet wherein the rim inside wall portion comprises a rim inside wall upper sloped surface, and an improvement in user visibility and user rim portion cleanability is sought, flush water can be constrained from splashing outside the bowl portion by traveling by centrifugal force along the rim inside wall upper sloped surface from the inside surface formed at a relatively low height. The rim portion of the flush toilet of the invention includes a rim inside wall portion; the rim inside wall portion comprises a rim inside wall upper sloped surface, and an inside surface vertically extending straight up to the rim inside wall upper sloped surface; and the water supply apparatus comprises a constant flow rate valve for spouting a predetermined constant flow rate of flush water from the water spouting portion.

A flush toilet wherein the rim inside wall portion comprises a rim inside wall upper sloped surface, and an improvement in user visibility and user rim portion cleanability is sought, flush water can be constrained from splashing outside the bowl portion by traveling by centrifugal force along the rim inside wall upper sloped surface from the inside surface formed at a relatively low height. The rim portion of the flush toilet of the invention includes a rim inside wall portion; the rim inside wall portion comprises a rim inside wall upper sloped surface, and an inside surface vertically extending straight up to the rim inside wall upper sloped surface; and the water supply apparatus comprises a constant flow rate valve for spouting a predetermined constant flow rate of flush water from the water spouting portion.

A toilet bowl unit includes a toilet bowl with an inner toilet bowl surface having an upper peripheral portion, a central peripheral portion and a lower sump portion. A peripheral slot separates a lower edge of the upper peripheral portion from an upper edge of the central peripheral portion. A peripheral water channel is concealed inside the toilet bowl unit and has a side wall which is a weir over which water may flow into the peripheral slot. The slot has a discharge opening which is substantially horizontal at the rear and sides of the inner toilet bowl surface (for discharging a curtain of water) and includes at least one serpentine portion at the front of the inner toilet bowl surface (for discharging a jet of water). The horizontal portion(s) of the discharge opening are positioned just below a seat platform surface in order to minimize the unwashed area at the top of the inner toilet bowl surface.

A flush toilet wherein at least a portion of the exterior part of an exterior member installed on a rim portion can be easily installed and registered at the height of the rim outer wall upper sloped surface, and seen from the toilet lateral direction, the border between at least a part of the exterior part of the exterior member and the rim outer wall upper sloped surface appears as a single aligned straight line, imparting an aesthetic impression to the user. The rim portion of the flush toilet of the invention includes a rim outer wall upper sloped surface being positioned in an outside of an upper region of the rim outer wall portion, and at least a portion of the exterior part is disposed at the height of the rim outer wall upper sloped surface.

A flush toilet wherein at least a portion of the exterior part of an exterior member installed on a rim portion can be easily installed and registered at the height of the rim outer wall upper sloped surface, and seen from the toilet lateral direction, the border between at least a part of the exterior part of the exterior member and the rim outer wall upper sloped surface appears as a single aligned straight line, imparting an aesthetic impression to the user. The rim portion of the flush toilet of the invention includes a rim outer wall upper sloped surface being positioned in an outside of an upper region of the rim outer wall portion, and at least a portion of the exterior part is disposed at the height of the rim outer wall upper sloped surface.

A modular toilet is disclosed comprising a toilet shell and a hydraulic core. The hydraulic core module is a separate unit from the toilet shell module and may be non-symmetrical with the internal and external form of the shell. The core module comprises a toilet bowl connected to a siphon drain comprising a weir. The drain may be a vertical loop drain. The toilet shell and the hydraulic core may comprise mutual sealing surfaces. The drain may comprise openings for connection to a toilet ventilation system.

A modular toilet is disclosed comprising a toilet shell and a hydraulic core. The hydraulic core module is a separate unit from the toilet shell module and may be non-symmetrical with the internal and external form of the shell. The core module comprises a toilet bowl connected to a siphon drain comprising a weir. The drain may be a vertical loop drain. The toilet shell and the hydraulic core may comprise mutual sealing surfaces. The drain may comprise openings for connection to a toilet ventilation system.

A flush toilet for cleaning a toilet main body and discharging waste by using flush water is disclosed. The flush toilet contains a bowl portion including a bowl shaped waste-receiving surface and a rim portion formed on a top edge of the waste-receiving surface, the rim portion having an inner circumferential surface whose top portion is configured to rises vertically. The bowl portion contains a front region, the front region includes a first arc-shaped surface having a curvature R1 in a horizontal direction of a top portion of the waste-receiving surface and a second arc-shaped surface having a curvature R2 in a vertical direction formed by the inner circumferential surface of the rim portion and the waste-receiving surface, and the ratio of the curvature R1 to the curvature R2 is in a range of 1:3 to 3:1.

A flush toilet for cleaning a toilet main body and discharging waste by using flush water is disclosed. The flush toilet contains a bowl portion including a bowl shaped waste-receiving surface and a rim portion formed on a top edge of the waste-receiving surface, the rim portion having an inner circumferential surface whose top portion is configured to rises vertically. The bowl portion contains a front region, the front region includes a first arc-shaped surface having a curvature R1 in a horizontal direction of a top portion of the waste-receiving surface and a second arc-shaped surface having a curvature R2 in a vertical direction formed by the inner circumferential surface of the rim portion and the waste-receiving surface, and the ratio of the curvature R1 to the curvature R2 is in a range of 1:3 to 3:1.