Patent ID: 8281424

Claim:
A flush toilet cleaned by pressurized flush water, said flush toilet comprising: a toilet main unit provided with a bowl portion, a rim water spouting port and a jet water spouting port both for expelling flush water, and a drain trap pipe; a reservoir tank for storing flush water; flush water supply means for supplying flush water to the rim water spouting port to clean the bowl portion of the toilet main unit and for replenishing flush water to the reservoir tank; a pressurizing pump for pressurizing flush water in the reservoir tank; a jet-side water supply path, formed in a convex shape pointing upward, for supplying flush water pressurized by the pressurizing pump to the jet water spouting port to clean the bowl portion of the toilet main unit together with the flush water supplied from the rim water spouting port; an overflow path, the lower end of which is connected downstream of the highest position of the jet-side water supply, and the upper end of which opens in the upper side of the reservoir tank; and backflow prevention means, provided on the overflow path, for preventing backflow of flush water from the jet-side water supply path to the reservoir tank; wherein a highest position (L 1 ) of the jet-side water supply path is set to be equal to or higher than the position of a highest water level (L 3 ) in the reservoir tank during a normal operation; an upper end position (L 2 ) of the overflow path is set to be equal to or higher than the position of the highest water level (L 3 ) in the reservoir tank; the upper end position (L 2 ) of the overflow path is set to be higher than the position of a lower end (L 6 ) of the overflow path and the position of an accumulated water level (L 7 ) in the bowl; and the position of a lower end (L 6 ) of the overflow path is set to be equal to or higher than the position of the accumulated water level (L 7 ) in the bowl.