Tank valve for a lavatory

Details Tank valve for a lavatory Tank valve for a lavatory

2002-08-06

2003-09-09

Phillips, Charles E. (Department: 3751)

Baths, closets, sinks, and spittoons

Flush closet

Tank only

C004S402000, C004S403000

Reexamination Certificate

active

06615415

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related to a lavatory, and more particularly to a tank valve for a lavatory.
2. Description of Related Art
Referring to
FIGS. 6 and 7
, in a lavatory tank (
40
), a conventional tank valve (
50
) is pivotally mounted on an overflow tube (
42
) by a pair of arms (
54
). The tank valve (
50
) has a flange (
51
) formed at a top thereof, and an ear (
52
) is formed on the flange (
51
). A lift line (
53
) is attached in the ear (
52
) and connected with a lift arm (
45
). A hollow semi-spherical plug (
55
) is formed at a bottom of the tank valve (
50
) for plugging a water outlet (
41
).
The conventional valve (
50
) is generally made of rubber or plastic with a low density. When a user pulls up the lift line (
53
), the valve (
50
) is pivoted up about the overflow tube (
42
) to open the outlet (
41
), and water in the tank (
40
) flows out from the outlet (
41
) and flushes the bowl (not shown or numbered).
Because the plug (
55
) is hollow and the valve (
50
) has a density lower than that of water, the valve (
50
) floats in the water to open the outlet (
41
) until a surface of the water is below the valve (
50
). Thus, unless all of the water in the tank flows out, the valve (
50
) cannot be pivoted downwards to plug the outlet (
41
) again. If flushing the bowl does not need so much water, as in after a child's urination, however, the user cannot control an out-flow capacity of water, and thus a lot of water is wasted.
Furthermore, early in the stage of water flowing in the tank (
40
), the flange (
51
) and the plug (
55
) cannot tightly close the outlet (
41
) because of the buoyancy exerting thereon. Water may leak out from gaps between the valve (
50
) and the outlet (
41
). When water in the tank reaches a certain level, under the pressure of the water the valve (
50
) then can tightly close the outlet (
41
). After a long time of use in water, the valve (
50
) will be hardened and the flange (
51
) may be deformed, so that the outlet (
41
) cannot be tightly closed and water will be leaked out too.
Furthermore, the ear (
51
) is often destroyed after a certain amount of use, and the lift line (
53
) is disengaged from the valve (
50
). Thus, the valve (
50
) must be replaced.
Therefore, the invention provides an improved a tank valve to mitigate and/or obviate the aforementioned problems.
SUMMARY OF THE INVENTION
The main objective of the invention is to provide a tank valve by which a user can control an out-flow capacity of water.
Another objective of the invention is to provide a tank valve which can immediately close an outlet of the tank when the user releases a handle.
A further objective of the invention is to provide a tank valve which has a long using life.


REFERENCES:
patent: 996186 (1911-06-01), Willetts
patent: 1712605 (1929-05-01), Delany
patent: 2239923 (1941-04-01), May
patent: 2319256 (1943-05-01), O'Hare
patent: 3154794 (1964-11-01), Antunez, Jr.
patent: 4639951 (1987-02-01), Lamot
patent: 5117514 (1992-06-01), Richter

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