Abstract: The flush toilet bowl includes: a toilet bowl portion; a toilet drainage channel; a toilet bowl main body that includes: a first water discharge port that discharges a first cleaning water that forms a swirling flow; and a second water discharge port that discharges a second cleaning water that is joined, on the downstream side of the first cleaning water flowing on the surface of the toilet bowl portion, by the first cleaning water and forms a downward flow toward the toilet drainage channel; and a toilet bowl cleaning device that supplies the first and second cleaning water, wherein by the time the first cleaning water reaches a merging point where the first cleaning water joins the second cleaning water that forms the downward flow, the second cleaning water has been increased to a set flow rate.

Abstract: In a drain socket for a toilet stool includes a vertical pipe including an upper end connected with the discharge port of the toilet stool, an adjustable pipe extending substantially horizontally from the lower end of the vertical pipe and a connecting pipe between the adjustable pipe and a drain of a toilet. The vertical pipe has a bend causing the vertical pipe to have at its lower end an axis displaced longitudinally and rearward of the toilet stool from an axis at the upper end to define an eccentrically curved flow path. The flow path includes a part located near the bend and formed by increasing a transverse dimension of a longitudinal front end thereof with respect to the toilet stool so that the part has such a noncircular cross section in which a front portion of the section has a larger area than a rear portion of the cross section.

Abstract: In a drain socket for a toilet stool which comprises a vertical pipe having an upper end connected with the discharge port of the toilet stool, an adjustable pipe extending substantially horizontally from the lower end of the vertical pipe and a connecting pipe between the adjustable pipe and a drain in the floor of a toilet, the vertical pipe has a bend causing it to have at its lower end an axis displaced longitudinally and rearward of the toilet stool from its axis at its upper end to thereby define an eccentrically curved flow path. The socket adapts a toilet stool for installation in a wide range of drain positions and produces a siphoning action rapidly to flush the toilet bowl effectively with a small amount of water.