Dual flush system for toilets
US4837867A · kind A · utility
Inventor
Key dates
| Filing date | Mar 25, 1988 |
| Grant date | Jun 13, 1989 |
| Priority date | — |
| Expiry date | Mar 25, 2008 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE03D1/142
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A dual flush system for toilets to effect a partial or mini-flush of the toilet to carry away liquid wastes by partially opening of the main valve situated in the water holding tank of the toilet or a period of time determined by an operator. So long as the main valve is only opened slightly, downward pressure upon the main valve and suction forces of water passing between the main valve and valve seat exert a downward force on the main valve with the effect that the main valve is pulled back into a closed position after opening. Only when the main valve is raised to a position where its buoyancy exceeds downward pressures is a full flush effected. Accordingly, the described device provides means to limit the upward lifting of the main valve by limiting the lengthwise travel of a cord attached to the main valve, the cord having attached at its other end variously a pull ring or flush handle and lever. Lengthwise travel of the cord is terminated by a stop attached to the cord which strikes an outstanding arm attached to the toilet overflow pipe. An additional embodiment utilizes a spring mechanism to increase resistance at a set point to the main flush handle movement to indicate th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.