Baths – closets – sinks – and spittoons – Flush closet – Bowl
Reexamination Certificate
1999-07-13
2001-09-25
Huson, Gregory L. (Department: 3751)
Baths, closets, sinks, and spittoons
Flush closet
Bowl
C004S421000, C004S428000
Reexamination Certificate
active
06292956
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a water flush toilet bowl in which a bowl main body and a trap device are separately constructed, and a cast molding apparatus for such a toilet bowl.
2. Description of the Related Art
If a water flush toilet bowl is formed by slip casting as a unit including a trap portion thereof the trap portion is exposed at a side face of the toilet bowl. This is not only undesirable from a view point of ornamental design but also has a drawback that it is easily stained and difficult to wash out.
A water flush toilet bowl provided with a skirt portion around the main body of the bowl, in which the trap device is accepted, has already been disclosed, for example in U.S. Pat. No. 4,672,689 or International Publication WO 95/27833. When the skirt portion is provided around the main body of the bowl, since it is difficult to form the main body of the bowl and the trap together as a unit due to restrictions in the construction of the casting mold, the main body of the bowl and the trap must be separately formed, and then the trap is attached to the bowl main body afterwards.
With the toilet bowl shown in International Publication WO 95/27833, only a lower face is opened, and therefore it is difficult work to attach the trap afterwards. On the other hand, with the toilet bowl shown In U.S. Pat. No. 4,672,689, as seen in
FIG. 35
, it is easy work to attach the trap device
101
afterwards since the lower face and the rear face of the toilet bowl
100
are continuously opened.
However, in the toilet bowl shown in U.S. Pat. No. 4,672,689, it is impossible to adjust the length of the trap device easily with respect to fitting the position of a drain pipe, and therefore cutting the drain pipe is necessary for adjusting the length thereof, which is troublesome.
Further, when the lower face and the rear face of the toilet bowl are continuously opened, the rear edge portion
103
of the skirt portion
102
is short or insufficient in mechanical strength, and therefore cracks and breaks are easily caused at this portion during the process of attaching the trap device. For resolving this problem, the thickness of the skirt portion
102
must be increased, however it takes a long time build up sufficient thickness in the casting process and also production costs are greater.
SUMMARY OF THE INVENTION
For resolving the above mentioned problems, it is an object of the present invention to provide a water flush toilet bowl formed as a unit integrally with a bowl portion of a main body, a portion of a trap device, and a trap cover portion covering said trap portion.
Said trap cover portion is formed on a lap surface except for a lower portion and a rear portion thereof.
In this case, a reinforcement portion can be formed to reinforce the opening portion on a part of the opening portion at the rear portion of the main body so as to enhance the mechanical strength thereof.
Said reinforcement portion can better be formed as a unit integrally with said trap cover portion, rather than being formed separately then united on said opening portion.
As for the form of said reinforcement, it can be formed as a folded-back portion formed with the unit integrally.
Said trap cover portion can be formed on a lap surface except for a lower portion.
Here, said trap device can be formed by a connection pipe connecting between the upper stream connection pipe and the lower stream connection pipe, thereby forming a water staying portion forming a trap seal bridging over the upper stream connection pipe, the lower stream connection pipe and the connection pipe. Alternatively, a water staying portion to achieve the trap seal can be formed in the upper stream connection pipe.
Further, the main body of the toilet bowl can be fixed onto a floor through the upper stream connection pipe or the lower stream connection pipe, and in that case it is preferable to provide a mechanism for finely adjusting a position of the main body of the toilet bowl, at either one of the main body of the toilet bowl, or the upper stream connection pipe and the lower stream connection pipe.
Additionally, at least a portion of said trap device can be formed as a unit together with an adjusting element for adjusting the height of the main body of the toilet bowl, thus making the use thereof easy for handicapped persons.
Moreover, it is also possible to provide a choking portion for adjusting the opening area at the opening portion of the drain side of the lower stream connection pipe of the trap device.
Also, in the case of said trap device being formed together with the upper stream connection pipe, the lower stream connection pipe and the connection pipe, these pipes can be formed with a corresponding means to align their connection. The means may be marks formed on each pipe or may be convex and concave parts engaging each other.
Further, when said trap device is formed with the upper stream connection pipe, the lower stream connection pipe and the connection pipe, the external diameter of the connection pipe can be nearly equal to the internal diameter of the upper stream connection pipe and the lower stream connection pipe, such that the connection pipe fitted into the upper stream connection pipe and the lower stream connection pipe can slide with no escape of liquid. In this case, it is better that these pipes be formed to fit into each other like a key and keyhole.
Also, in accordance with the present invention, a cast molding apparatus for a flush toilet bowl is provided comprising:
a body mold for casting a bowl portion of the toilet bowl, a rising pipe formed to be continuous with a drain opening of said bowl portion, a falling pipe formed to be continuous with said rising pipe, a cover portion covering a portion bridging from a side face to a front face, and a fold back portion formed around an opened rear portion of the toilet bowl; and
a rim mold for forming rim portions; wherein said body mold is constructed with a top mold, a bottom mold and right and left side molds, said top mold has surfaces for forming said bowl portion and upper portions of said rising pipe and said falling pipe, said bottom mold has surfaces for forming lower portions of said rising pipe and said falling pipe, an inner surface of said cover portion and an inner surface of said fold back portion, and said right and left side molds have surfaces for forming an outer surface of said cover portion and an outer surface of said fold back portion.
Further, in accordance with the present invention, a cast molding apparatus for a water flush toilet bowl is provided comprising:
a body mold for casting a bowl portion of the toilet bowl, a rising pipe formed to be continuous with a drain opening of said bowl portion, a falling pipe formed to be continuous with said rising pipe, a cover portion covering a portion bridging from a side face to a front face, and a rear portion of the toilet bowl; and
a rim mold for forming rim portions; wherein said body mold is constructed with a top mold, a bottom mold and right and left side molds, said top mold has surfaces for forming said bowl portion and upper portions of said rising pipe and said falling pipe, said bottom mold has surfaces for forming lower portions of said rising pipe and said falling pipe, an inner surface of said cover portion and an inner surface of said rear portion, and said right and left side molds have surfaces for forming an outer surface of said cover portion and an outer surface of said rear portion.
REFERENCES:
patent: 4171548 (1979-10-01), Wilson
patent: 4672689 (1987-06-01), Heinze et al.
patent: 5176406 (1993-01-01), Straghan
patent: 5487193 (1996-01-01), Hennessy
patent: 5918325 (1999-01-01), Arita et al.
patent: 5044650 (1975-12-01), None
patent: 61130674 (1986-08-01), None
patent: 235134 (1990-02-01), None
patent: 4161538 (1992-06-01), None
patent: 439328 (1992-06-01), None
patent: 563802 (1993-08-01), None
patent: 679877 (1994-11-01), None
patent: 95/27833 (1995-10-01), None
Blackman William D.
Carrier Joseph P.
Carrier Blackman & Associates P.C.
Huson Gregory L.
Nguyen Tuan
LandOfFree
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