Patent ID: 6192526
Filing Date: 2001-02-27
Classification: E03D

Abstract:
A top mounted flush valve for installation in a blind drain hole in the bottom wall of a toilet tank, comprising:a generally cylindrical valve body sized for insertion through a blind drain hole in a bottom wall of a toilet tank from the upperside thereof, the valve body having a central aperture;means on an underside of the valve body for providing a watertight seal between the valve body and an upperside of the bottom wall of the tank;a generally cylindrical drive collar rotatable within the central aperture of the valve body and having a first threaded portion; anda generally cylindrical spring nut having a second threaded portion engaged with the first threaded portion of the drive collar so that the drive collar can be screwed to generate relative movement between the drive collar and the spring nut along a longitudinal axis substantially perpendicular to the bottom wall of the tank, the spring nut having a plurality of fingers that can deflect inwardly to pass partially through the drain hole in the bottom wall of the tank during insertion and that can spring outwardly at a predetermined location of the spring nut relative to the bottom wall of the tank in order to provide a locking engagement between the spring nut and the bottom wall of the tank;whereby rotation of the drive collar in a first predetermined direction relative to the spring nut will press the seal means on the underside of the valve body tightly against the upperside of the bottom wall of the tank, and rotation of the drive collar in a second predetermined direction opposite the first direction will release the seal means.