Baths – closets – sinks – and spittoons – Drain – overflow or trap for a sink or bath – Drain valve
Reexamination Certificate
2001-01-08
2002-01-29
Huson, Gregory L. (Department: 3751)
Baths, closets, sinks, and spittoons
Drain, overflow or trap for a sink or bath
Drain valve
C004S688000, C004S287000
Reexamination Certificate
active
06341391
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to an improved hidden drain outlet structure for sink and particularly a hidden drain outlet structure that may be disassembled easily for cleaning and repairs, and is capable of discharging water smoothly without clogging the drain pipe.
BACKGROUND OF THE INVENTION
The conventional drain outlet structure of a sink (as shown in
FIG. 1
) mostly has a control bar for lifting a plunger up or down when in use. The control bar sticks out from the drain pipe for a significant distance. The plunger head will be moved up above the basin bottom when draining water. It is easy to suck in foreign articles or garbage and block the drain pipe. The construction is rough and lacks aesthetic appealing. In view of these disadvantages, there are some refinements and improvements been developed. U.S. Pat. No. 5,509,150 (shown in
FIG. 2
) is one of the examples. It has a hidden drain feature which includes a drain pipe
10
connects with an outlet of the sink
1
. In the drain pipe
10
, there is a movable plunger
11
controlled by a pull rod
12
for moving up to drain water or moving down to retain water. At the top end of the pipe
10
, a stationary disk
13
is provided for trapping foreign articles and garbage. Although it has a more appealing look than the conventional drain features, it has some disadvantages. For instance, the stationary disk
13
is fixed and cannot be removed. If the drain pipe
10
is clogged, the whole set of the drain pipe
10
has to be disassembled from under for doing the repairs job. It is very inconvenient and time consuming. Furthermore, as water discharge always forms a vortex at the outlet, the substantially flat top of the stationary disk
13
significantly slows down water discharge speed. Its fixed stationary disk
13
design also cannot match with most filtering articles now available in the market place that are designed for conventional sinks and drain features. There is still room for improvement.
SUMMARY OF THE INVENTION
It is therefore an object of this invention to provide an improved hidden drain outlet structure for sinks that has a drain head screwed to the upper end of a drain pipe. The drain head may engage with a filter which is easy to disassemble for repairs and maintenance. It is also capable of discharging water smoothly without clogging the drain pipe.
REFERENCES:
patent: 1195827 (1916-08-01), Lucke
patent: 1671134 (1928-05-01), Speakman
patent: 2989758 (1961-06-01), Turek et al.
patent: 3314083 (1967-04-01), Minella
patent: 3314085 (1967-04-01), Minella
patent: 3314086 (1967-04-01), Minella
patent: 3465372 (1969-09-01), Reagan
patent: 5509150 (1996-04-01), Bergmann et al.
Dougherty & Troxell
Huson Gregory L.
Le Huyen
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