Note: Descriptions are shown in the official language in which they were submitted.
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FLUSH TOILET BOWL
Technical Field
This invention relates to a seat-type flush toilet bowl
and, more particularly, a flush toilet bowl which is
increased in a power of discharging sewage by flush water.
Background Art
As such a seat-type flush toilet bowl, a wash down
system and a siphoning wash down ystem of flush toilet
bowls have widely been utilized in the past.
Fig. 7 is a longitudinal sectional view showing a
conventional example of a flush toilet bowl according to
these systems, and Fig. 8 is a plan view thereof.
Referring to the drawings, at the upper end of the body
1 of the flush toilet bowl is provided a water supply
chamber la which communicates with a flush water tank (not
shown), and this water supply chamber la is connected to
a rim water path lb formed on the periphery of the upper
end of a bowl part 2. The rim water path lb is provided
with small-diameter water projec ion holes lc on the
portion facing the bowl part 2 and, simultaneously, is
provided with five large-diameter water projection holes
ld at the farthest portion away from the water supply
chamber la, as shown in Fig. 8. Moreover, at the down-
stream of the bowl part 2 is provided a substantially
inverted U-shaped discharge passage 3, the terminating end
of which opens at the bottom of the body 1 as a discharge
port 3a.
With such a construction of the flush toilet bowl, a
trap is formed by a sealed water W which is determined
depending on the highest position oi-` the bottom wall of the
discharge passage 3. The flush water from the flush water
tank is supplied from the water supply chamber la to the
rim water path lb, and released toward the bowl part 2 from
the small and large-diameter water projection holes lc and
ld.
During the process of such flush, the flush water from
the small diameter water projectio~ hole lc flushes down
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the surface of the bowl part 2 above the sealed water W,
and the flush water from the large-diameter water projec-
tion holes ld flows into the sealed water W so that it
concentrates on the point P shown in Fig. 8. Mainly, the
flow of the powerful flush water from the large- diameter
water projection holes ld pushes out the sealed water W to
the discharge passage 3, and the flush water flows together
with sewage from the discharge passage 3 to the discharge
port 3a and is discharged.
At the portion where a flow passage is connected from
the bowl part 2 toward the discha~ge passage 3, is posi-
tioned a water discharge opening 10. This water discharge
opening 10 is positioned at the lowest level in the flow
passage proceeding from the bowl part 2 toward the dis-
charge passage 3, and the inner peripheral wall of the ball
part 2 forming the periphery at the upper end and at the
left and right rises usually at an angle of 50 degrees and
more. Accordingly, in the case where the lengths in the
front and back directions of the bowl part 2 are made
equal, a position of the water discharge opening 10 becomes
deeper compared with a design in which the inclination of
the inner peripheral wall is made gentle and, therefore,
the distance from the point P, where flush water from the
large-diameter water projection holes ld converges, to the
water discharge opening 10 becomes longer.
Further, provision of the wat~r discharge opening 10
at the lowest position makes smaller a ratio of the opening
area of the water discharge opening 10 to the longitudinal
section which is occupied in the bowl part 2 by the sealed
water W, as shown in Fig. 9.
Thus, in the case where the distance from the point P,
where flush water from the large diameter water projection
hole ld concentrates, to the water discharge opening 10 is
long, a power of the flush water which concentrates on the
point P is apt to attenuate before it is transmitted to the
water discharge opening 10. Furthe-, the flush water which
has concentrated on the point P forms a flow which acts on
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the sealed water W and presses it out into the discharge
passage 3; however, since the volume of the sealed water
W is large relative to the water d_scharge opening 10, as
shown in Fig. 9, the power by which the flush water presses
the sealed water W is apt to be di$persed, and there is a
limit in magnitude of the force of action which promotes
the flow toward the water discharg~ opening 10.
In this way, since, with the conventional flush water
toilet bowl, the water discharge opening 10 is provided at
the lowest level below the sealed water W, there is a
tendency for the flow of flush wa er, which acts on the
sealed water W so as to press it, to not be effectively
utilized. Therefore, there are some cases which require
countermeasures of making the pres~ure of supply of flush
water higher or increasing the amount of supply thereof.
The present invention has been made taking such points
into consideration, and aims at providing a flush toilet
bowl which allows the discharge of sewage more effectively
to be performed utilizing an energy of flush water without
an increase in the pressure and amount of supply of flush
water.
Disclosure of Invention
In order to achieve the above-mentioned object, a flush
toilet bowl according to the present invention which
comprises:
a bowl part having an inclined surface inclined
downwardly;
a rim water path which is formec on the peripheral edge
portion of the upper end of said bowl part in communication
with a flush water supply passage and which is provided
with a plurality of projection holef opening into said bowl
part side; and
a discharge passage the inlet p~rt of which is provided
near the bottom of said bowl part and which is of an
inverted-U shape,
said inlet part of the disch~rge passage having an
inclined surface inclined from the base end of the inlet
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part at the upper position toward the terminating end of
the inlet part at the lower position, said inclined surface
being shaped substantially parallel to the inclined surface
near the bottom of said bowl part.
As a preferable form of the present embodiment, one or
more water projection holes provided substantially at the
position opposite the discharge p ssage among said water
projection holes on the rim water path are greater in
diameter than the other water projection holes and are
provided directed toward said inle part of the discharge
passage.
As a further preferable form of the present embodiment,
the inclined surface of the inlet part of the discharge
passage is shaped substantially in a straight line.
As a further preferable form of the present embodiment,
the opening area at the base end o~ the inlet part of the
discharge passage is greater than hat at the terminating
end of the inlet part.
According to the present invention, since the base end
of the inlet part of the discharge passage is at a position
higher than the terminating end of the inlet part, the
distance from the position of the surface of the sealed
water to the base end of the inlet part becomes short; so,
a ratio of attenuation of a force of flow of the flush
water projected from the water projection holes on the rim
water path is small, so allowing a force of pushing out the
sealed water to the discharge passage side by the projected
flush water to be made great.
This function is more effective~y carried out by making
the opening areas of the water projection holes provided
at a position substantially opposite the discharge passage
among the water projection holes on the rim water path,
greater than the opening area of the other water projection
holes, and by providing the water projection holes so as
to be directed to the inlet part of the discharge passage.
Further, since the inclined surface of the inlet part
of the discharge passage is shaped substantially like a
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straight line, a force of pushing out the sealed water by
the projected flush water can be used more effectively.
Moreover, since the opening ar~a at the base end of the
inlet part of the discharge passage is made greater than
that at the terminating end of the inlet part, the sealed
water can be more effectively forced into the discharge
passage.
Brief Explanation of Drawings
Fig. 1 is a longitudinal sectional view showing a first
embodiment of the present invention;
Fig. 2 is a plan view including a partial cutaway
portion of the flush toilet bowl shown in Fig. l;
Fig. 3 is a sectional view taken along line III-III in
Fig.1;
Fig. 4 is a longitudinal sectional view showing a
second embodiment of the present invention;
Fig. 5 is a plan view including a partial cutaway
portion of the flush toilet bowl shown in Fig. 4;
Fig. 6 is a longitudinal sectional view showing a third
embodiment of the present invention;
Fig. 7 is a longitudinal sectional view showing a
conventional flush toilet bowl;
Fig. 8 is a plan view including a partial cutaway
portion of the flush toilet bowl shown in Fig. 7; and
Fig. 9 is a sectional view taken along line of IX-IX
in Fig. 7.
Best Mode for Carrying Out the Invention
Figs. 1 to 3 show a flush toilet bowl according to a
first embodiment of the present invention.
The body 1 of the flush toilet bowl comprises a bowl
part 2 having an inclined surface 2a inclined downwardly,
a rim water path lb formed on the ~eripheral edge portion
at the upper end of the ball part 2 in communication with
a water supply chamber la, and a d~scharge passage 3, the
inlet part 4 of which is provided near the bottom of the
ball part 2 and which is substantially of an inverted U-
shape.
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A plurality of small-diameter water projection holes
lc are provided on the rim water ~ath lb in such a way as
to be directed toward the ball part 2, and at the position
opposite an inlet part 4 of the discharge passage 3 are
provided large-diameter water projection holes ld each
having an opening area greater than that of the small-
diameter water projection holes lc.
The inlet part 4 of the discharge passage 3 is in the
form of a tube the opening axis of which is inclined in an
obliquely upward direction toward the forward end side of
the body 1 of the toilet bowl (the right side in Fig. 1),
and the base end 4a thereof is in a position above the
terminating end 4b. Further, an inclined surface 4c
inclined from the base end 4a of the inlet part to the
terminating end 4b of the inlet part is formed, and is
substantially parallel to the inclined surface 2a near the
bottom of the ball part 2.
Moreover, in the present embodiment, the inclined
surface 4c is formed substantially like a straight line.
Further, the large-diameter water projection holes ld
provided on the rim water path lb are directed toward the
discharge passage 3, and the flush water projected from the
large-diameter water projection holes ld is adapted to be
able to effectively flow into the inlet part 4 along the
inclined surface 2a of the ball part 2.
The discharge passage 3 is so shaped that it rises
toward the top 3b of the trap in an obliquely upward
direction following the inlet part;4, and descends from a
position of exceeding the top 3b of the trap toward the
discharge port 3a.
According to the present embociment, since the inlet
part 4 of the discharge passage 3 is shaped like a tube
having the inclined surface 4c, the base end 4a thereof is
positioned above the terminating end 4b, and a distance H
from the surface of the sealed wat~r W to the base end 4a
is smaller than the distance h in he prior art (refer to
Fig. 9)-
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Accordingly, in the case flush wash water projectedfrom the large-diameter water projection holes ld reaches
with concentration on P, flows down into the sealed water
W and further along the inclined surface of the ball part
2, and then into the base end 4a of the inlet part of the
discharge passage 3, the sealed water W forced into the
discharge passage 3 from the base ~nd 4a of the inlet part
simultaneously with the projected flush water is less than
the seaIed water in the prior art, so; a force of flow of
the flush water projected from the large diameter water
projection holes ld can be more effectively actuated on the
sealed water W.
Namely, since a ratio of attenuation of the flow energy
of the wash water followed by a collision of the flush
water projected from the large diameter water projection
holes ld with the sealed water W becomes small, the flush
water, even if less in quantity and lower in pressure than
in the prior art, flows into the sealed water W forcing it
into the discharge passage 3 from the inlet part 4, and
exceeds the top 3b of the trap, thereby allowing the
siphoning action to occur rapidly.
Moreover, making the inclined ~urface 4c of the inlet
part 4 parallel to the inclined surace 2a of the ball part
2 allows the flush water to pass through the inlet part 4
more smoothly. Further, forming the inclined surface 4c
like a straight line allows the flush water to pass through
even more smoothly.
Thus, the present embodiment allows the water head at
the inlet part 4 of the discharge passage 3 to be made
small, so, when flush water is supplied from the rim water
path lb into the ball part 2, a force of the flush water
which pushes the sealed water W is ~ffectively transmitted
to the discharge passage 3, thereby enabling a powerful
flushing of the bowl. This allows stable flushing and dis-
charging actions to be produced with the supply of arelatively small quantity of flush water.
Figs. 4 and 5 are views showing a second embodiment of
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the present invention.
In the present embodiment, an -,ngle of inclination of
the inclined rising part (part which rises toward the top
13b of a trap) 13d of a trap disch~rge passage 13 is made
greater than that of the first embodiment. This enables
the inlet part 14 of the disch~,rge passage 13 to be
positioned at the back of the bowl part 2 (at the left in
Fig. 4), so that the discharge of the sealed water W and
flush water can be performed more .moothly.
Further, since an angle of inclination of the inclined
rising part 13d of the trap discharge passage 13 is large,
the time taken until flush water flows over the top 13b of
the trap becomes short, thereby rapidly producing the
siphoning action.
The others are the same as those in the afore-mentioned
first embodiment of the present invention, and the inlet
part 14 is provided with an inclin~d surface 14c which is
inclined toward the terminating end 14b of the inlet part
at the lower position from the base end 14a of the inlet
part at the upper position, said inclined surface 14c being
formed substantially parallel to the inclined surface near
the bottom of the ball part 2. Also in the present
embodiment, flushing and discharging actions can be effec-
tively produced with a small quantity of flush water in a
similar way to the afore-mentioned first embodiment.
Fig. 6 is a view showing a third embodiment of the
present invention.
The present embodiment is similar to the above-men-
tioned first embodiment except for the construction of an
inlet part 24 of the discharge pass~ge. The inlet part 24
in the present embodiment features an opening area at the
base end 24a of the inlet part of which is made greater
than that at the terminating end 24b of the inlet part.
Namely, the inlet part 24 is in the form of a section
divergently inclined so that it becomes large in section
from the terminating end 24b of the inlet part toward the
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base end 24a of the inlet part. This allows the flush
water and the sealed water W to flow into the inlet part
24 more smoothly, thereby enabling 4table flushing and dis-
charging actions to be produced with the supply of a small
quantity of flush water.
Industrial Applicability
As explained above, the present invention allows the
water head at the inlet part of the discharge passage to
be made small, so, actuating a force of flow of the flush
water from the rim water path ef$ectively enabling the
positive flushing and discharging actions to be produced
using a smaller quantity of flush water.
The present invention provides superior effects through
application to a relatively large-type flush toilet bowl
which performs flushing and discharging actions additional-
ly utilizing the energy of flow of the flush water from the
rim water passage.
