Title of Invention

FLOWING-DOWN RAINWATER FILTRATION DEVICE AND RAINWATER STORAGE DEVICE USING THE SAME

Abstract A filtration device, which can be installed at a relatively low place below the full water level of a storage tank, is obtained. The filtration device is provided with a housing 22 attached to a lower part of an upper vertical pipe 21a and an upper part of a lower vertical pipe 21b from above and below and having a rainwater flow chamber 23 and a valve chamber 24; a ball valve 29 with a specific gravity less than 1 and accommodated in the housing movably between the rainwater flow chamber and the valve chamber for blocking a lower rainwater hole 23b in the rainwater flow chamber; a storage chamber 27 for storing the rainwater having reached the valve chamber from the rainwater flow chamber; a valve- seat opening portion 24b capable of being blocked with the ball valve so as to seal the valve chamber; an upper guiding member 31 for guiding the rising ball valve from the rainwater flow chamber to the valve chamber; and a lower guiding member 32 for guiding the lowering ball valve from the valve chamber to the rainwater flow chamber. A first strainer 26 configured capable of being taken in/out through the valve-seat opening portion is detachably attached to the lower rainwater hole, and a second strainer 33 for filtrating the rainwater flowing into the storage chamber is detachably attached to the storage chamber.
Full Text FLOWING-DOWN RAINWATER FILTRATION DEVICE AND RAINWATER
STORAGE DEVICE USING THE SAME
Technical Field
[0001]
The present invention relates to a flowing-down
rainwater filtration device, which eliminates foreign
substances mixed in rainwater dropping on a roof or a
rooftop of a building and flowing down, and to a rainwater
storage device using the same.
Background Art
[0002]
There has been conventionally utilized rainwater from
which sand and fine dusts are eliminated and which is
stored. And a rainwater filtration device for eliminating
sand and dusts from the rainwater has been proposed (See
Patent Document 1, for example). This filtration device
comprises an outer pipe and an inner pipe provided inside
this outer pipe; a vertical portion is formed in the outer
pipe; and the upper end of the outer pipe is connected to a
rain gutter. The lower end of the outer pipe is connected
to a catch basin communicating with a sewer culvert. An
outer peripheral edge of the upper end of the inner pipe is
arranged with a predetermined interval from an inner
peripheral surface of the vertical portion. The lower end
of the inner pipe is connected to a rainwater storage tank.
A part of the vertical portion of the outer pipe is formed
so as to continuously change its inner diameter, and an
-1-

upper part of the inner pipe is configured so as to enable
adjustment of the predetermined interval by moving the
inner pipe in the vertical direction. An opening portion
is provided at the outer pipe in the vicinity of the upper
end of the inner pipe, and a lid, which can open/close the
opening portion is provided at this opening portion.
[0003]
In this filtration device, rainwater flowing down
through the rain gutter flows down in the layered state
while adhering to the inner peripheral surface of the
vertical portion of the outer pipe. At a small- to medium-
scale rainfall when the rainfall intensity does not exceed
the flowing-down capacity of the sewer culvert and rivers,
the thickness of the layer of the rainwater flowing down on
the inner peripheral surface of the vertical portion is
smaller than the interval between the outer peripheral edge
of the upper end of the inner pipe and the inner peripheral
surface of the vertical portion, and thus the rainwater
flows down only through the outer pipe into the sewer
culvert via the catch basin but does not flow through the
inner pipe.
At a large-scale rainfall when the rainfall intensity
exceeds the flowing-down capacity of the sewer culvert and
the like, the thickness of the layer of the rainwater
flowing down on the inner peripheral surface of the
vertical portion becomes larger than the interval, and thus
the rainwater also flows down the inner pipe into the
-2-

rainwater storage tank. As a result, this filtration
device can divide and lead the rainwater from the rain
gutter into the storage tank only at the rainfall intensity-
exceeding the flowing-down capacity of the sewer culvert
and rivers, can be installed in a small space of an
existing rain gutter with a simple structure, and can
eliminate sand and fine dusts entering from the rain gutter
and lead the rainwater to the storage tank.
Patent Document 1: Japanese Patent Laid-Open No. 64-
83738 (Claims, Fig. 1)
DISCLOSURE OF INVENTION
PROBLEM TO BE SOLVED BY THE INVENTION
[0004]
However, when the rainwater divided using the above-
mentioned conventional rainwater filtration device is
stored in the storage tank, the rainwater does not reach
the storage tank by its own weight unless the filtration
device is provided above the full water level of the
storage tank. This causes a inconvenience that the
filtration device should be mounted at a relatively high
place. Furthermore if the filtration device is mounted at
a high place, inspection of the filtration device requires
use of a stand such as steps, which causes a problem that
daily inspection becomes relatively difficult.
The object of the present invention is to provide a
flowing-down rainwater filtration device, which can be
installed at a relatively low place below the full water
-3-

level of the storage tank, and to provide a rainwater
storage device using the same.
MEANS FOR SOLVING PROBLEM
[0005]
An invention according to claim 1 is, as shown in Fig.
1, a flowing-down rainwater filtration device 20 interposed
between an upper vertical pipe 21a and a lower vertical
pipe 21b coaxial with the upper vertical pipe 21a for
filtrating rainwater flowing down through the upper
vertical pipe 21a and for guiding it to the lower vertical
pipe 21b.
The characteristic configuration lie in that the
flowing-down rainwater filtration device comprises a
housing 22 attached to a lower part of the upper vertical
pipe 21a and an upper part of the lower vertical pipe 21b
from above and below and having a rainwater flow chamber 23
interposed between the upper vertical pipe 21a and the
lower vertical pipe 21b and a valve chamber 24 adjacent to
the rainwater flow chamber 23; an upper rainwater hole 23a
formed at an upper part of the rainwater flow chamber 23
for having the rainwater flow chamber 23 communicate with
the upper vertical pipe 21a so as to have the rainwater
flowing down through the upper vertical pipe 21a flow into
the rainwater flow chamber 23; a lower rainwater hole 23b
formed at a lower part of the rainwater flow chamber 23 for
having the rainwater flow chamber 23 communicate with the
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lower vertical pipe 21b so as to have the rainwater flowing
into the rainwater flow chamber 23 flow down to the lower
vertical pipe 21b; a ball valve 29 with a specific gravity
less than 1 and accommodated in the housing movably between
the rainwater flow chamber 23 and the valve chamber 24 for
blocking the lower rainwater hole 23b when the rainwater
in the rainwater flow chamber 23 is less than a
predetermined amount and the ball valve is disposed in the
rainwater flow chamber 23; a storage chamber 27
communicating with the valve chamber 24 and provided at a
lower part of the housing 22 for storing the rainwater
having reached the valve chamber 24 from the rainwater flow
chamber 23; a valve-seat opening portion 24b formed at an
upper part of the housing 22 opposed to the storage chamber
27 so as to open the valve chamber 24 and being capable of
sealing the valve chamber 24 by being blocked with the ball
valve 29 when the rainwater in the rainwater flow chamber
23 is not less than the predetermined amount and the ball
valve 29 is disposed in the valve chamber 24; an upper
guiding member 31 provided at the rainwater flow chamber 23
and for guiding the ball valve 29 rising in the rainwater
flow chamber 23 from the rainwater flow chamber 23 to the
valve chamber 24; and a lower guiding member 32 provided at
the valve chamber 24 and for guiding the ball valve 29
lowering in the valve chamber 24 from the valve chamber 24
to the rainwater flow chamber 23.
[0006]
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In the flowing-down rainwater filtration device
described in claim 1, since the rainwater in the rainwater
flow chamber 23 is less than a predetermined amount at the
beginning of rainfall, the ball valve 29 is guided to the
rainwater flow chamber 23 from the valve chamber 24 by the
lower guiding member 32 and blocks the lower rainwater hole
23b in the rainwater flow chamber 23. Therefore, though
initial rainwater at the beginning of the rainfall contains
a relatively large quantity of dusts, flowing-down of the
initial rainwater containing the relatively large quantity
of dusts into the lower vertical pipe 21b from the
rainwater flow chamber 23 through the lower rain water hole
23b can be surely prevented. Then, the initial rainwater
flows down into the storage chamber 27 from the rainwater
flow chamber 23 through the valve chamber 24 and is stored
in the storage chamber 27.
[0007]
On the other hand, after the storage chamber 27 is
filled with rainwater, the rainwater flow chamber 23 and
the valve chamber 24 begin to be filled with rainwater, and
when the water level is raised, the ball valve 29 with the
specific gravity less than 1 is floated and the lower
rainwater hole 23b is opened, and then, clean rainwater
with a relatively small quantity of dusts flowing down from
the upper vertical pipe 21a flows into the lower vertical
pipe 21b from the rainwater flow chamber 23 through the
lower rainwater hole 23b. And as shown in Fig. 2, when the
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water level is further raised, the ball valve 29 is guided
from the rainwater flow chamber 23 to the valve chamber 24
by the upper guiding member 31 and blocks the valve-seat
opening portion 24b and seals the valve chamber 24.
Therefore, as shown in Fig. 8, even if the filtration
device 20 is disposed below a rainwater intake lla of a
storage tank 11, the rainwater does not leak out from the
valve-seat opening portion 24b in the filtration device 20
but flows into the storage tank 11.
[0008]
An invention according to claim 2 is the invention
according to claim 1, wherein a first strainer 26 for
filtrating rainwater of the rainwater flow chamber 23 and
having it flow down into the lower vertical pipe 21b, is
detachably attached to the lower rainwater hole 23b and is
configured capable of being taken in/out through the valve-
seat opening portion 24b; the storage chamber 27 is
configured capable of accommodating the ball valve 29; the
lower guiding member 32 is foldably configured so as to
guide the ball valve 29 lowering in the valve chamber 24
from the valve chamber 24 to the rainwater flow chamber 23
in the extended state and to allow the ball valve 29 to
move between the valve chamber 24 and the storage chamber
27 in the folded state.
In the flowing-down rainwater filtration device
described in claim 2, foreign substances mixed in rainwater
flowing into the lower vertical pipe 21b through the lower
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rainwater hole 23b can be eliminated by the first strainer
26. On the other hand, the foreign substances are
accumulated in the first strainer 26, but as shown in Fig.
4, by folding the lower guiding member 32 so as to drop the
ball valve 29 into the storage chamber 27, the first
strainer 26 can be taken out of the rainwater flow chamber
23 through the valve-seat opening portion 24b, and by
providing the filtrating device 20 at a relative low place
where inspection work is easy, the inspection of the first
strainer 26 is facilitated.
[0009]
An invention according to claim 3 is the invention
according to claim 2, wherein a second strainer 33 for
filtrating rainwater flowing into the storage chamber 27
through the valve chamber 24 from the rainwater flow
chamber 23, is detachably attached to the storage chamber
27 and is configured capable of being taken in/out through
the valve-seat opening portion 24b; and a small-diameter
hole 27b discharging the rainwater flowing into the storage
chamber 27 to the outside is provided at a lower part of
the storage chamber 27.
The flowing-down rainwater filtrating device
described in claim 3 is capable of catching foreign
substances mixed in the initial rainwater flowing into the
storage chamber 27 by the second strainer 33. Therefore, a
relatively large quantity of foreign substances accumulate
in the second strainer 33, but as shown in Fig. 3, by
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folding the lower guiding member 32, the second strainer 33
can be taken out of the storage chamber 27 through the
valve-seat opening portion 24b and by providing the
filtration device 20 at a relatively low place where
inspection work is easy, the inspection of the second
strainer 33 is facilitated. Also, though the storage
chamber 27 is easily stained by dusts existing in a
relatively large quantity in the initial rainwater, the
stain can be decreased by providing the second strainer 33.
Moreover, since the small-diameter hole 27b is provided at
the lower part of the storage chamber 27, the initial
rainwater flowing and stored in the storage chamber 27 is
gradually discharged from the small-diameter hole 27b to
the outside, by which a situation that the rainwater is
stored in the storage chamber 27 even after the rain stops
can be effectively avoided.
[0010]
An invention according to claim 4 is the invention
according to claim 2 or 3, wherein a ring-shaped projection
25 is formed so as to project upward on the inner
peripheral edge of the lower rainwater hole 23b, and the
peripheral edge of the first strainer 26 is disposed at the
upper edge of the projection 25 so that the first strainer
26 is detachably attached to the lower rainwater hole 23b.
In the flowing-down rainwater filtration device
described in claim 4, the initial rainwater containing a
relatively large quantity of dusts at the beginning of
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rainfall can be stored in the storage chamber 27 through
the valve chamber 22 from the periphery of the projection
25. And the first strainer 26 can be taken out of the
rainwater flow chamber 23 with a relatively simple work of
only lifting the first strainer 26 upward so that the
inspection work can be relatively facilitated.
[0011]
An invention according to claim 5 is a rainwater
storage device which is provided with the filtration device
20 described in any one of claims 1 to 4, as shown in
Fig.8; the rainwater storage tank 11 having a rainwater
intake lla disposed above the filtration device 20; and a
rainwater guide pipe 16 with one end connected to the lower
end of the lower vertical pipe 21b and the other end
connected to the rainwater intake lla wherein the upper end
of the upper vertical pipe 21a is disposed above the
rainwater intake lla.
In the rainwater storage device described in claim 5,
when the rainwater filtered by the filtration device 20 and
stored in each inside of the lower vertical pipe 21b and
the rainwater guide pipe 16 raises the water level and
reaches the rainwater intake lla, the rainwater flows into
the storage tank 11 from the intake lla and is stored. As a
result, the stored rainwater can be taken out for usage as
necessary.
[0012]
An invention according to claim 6 is the invention
-10-

according to claim 5 and a rainwater storage device in
which a drain valve 17 capable of discharging the rainwater
in each inside of the upper vertical pipe 21a, the lower
vertical pipe 21b and the rainwater guide pipe 16 to the
outside is provided at the lower vertical pipe 21b or the
rainwater guide pipe 16.
In the rainwater storage device described in claim 6,
the majority of the dusts are eliminated by the filtration
device 20 but after a use of the filtration device 20 for a
longtime, it is fared that the foreign substances having
passed through the filtration device 20, though in a small
amount, settle and precipitate in each inside of the lower
vertical pipe 21b and the rainwater guide pipe 16.
Therefore, the insides of the lower vertical pipe 21b and
the rainwater pipe 16 needs to be washed in every
predetermined period. In the rainwater storage device
according to claim 6, water can be made to flow through
each inside of the lower vertical pipe 21b and the
rainwater guide pipe 16 by opening the drain valve 17,
which allows the foreign substances settled in the insides
of the lower vertical pipe 21b and the rainwater guide pipe
16 to be easily discharged to the outside.
[0013]
An invention according to claim 7 is the invention
according to claim 5 or 6, and, as shown in Fig. 9, is a
rainwater storage device provided with a check valve 41 for
preventing a rainwater flow from the rainwater guide pipe
-11-

16 to the lower vertical pipe 21b is provided at the lower
end of the lower vertical pipe 21b or the rainwater guide
pipe 16.
In this rainwater storage device according to claim 7,
even if the water level on the one end side of the
rainwater guide pipe 16 communicating with the upper
vertical pipe 21a through the lower vertical pipe 21b and
the filtration device 20 is lower than the water level on
the other end side of the rainwater guide pipe 16
communicating with the rainwater storage tank 11, the
rainwater does not backflow from the rainwater guide pipe
16 to the lower vertical pipe 21b. Therefore the rainwater
intake lla can be attached to a lower part of the rainwater
storage tank 11, for example, close to the bottom, so that
the length of the rainwater guide pipe 16 exposed above the
ground surface with the other end connected to the
rainwater intake lla can be reduced and the appearance of
the entire device can be improved.
EFFECT OF THE INVENTION
[0014]
The flowing-down rainwater filtration device of the
present invention comprises the housing having the
rainwater flow chamber and the valve chamber; the ball
valve with a specific gravity less than 1 accommodated in
the housing movably between the rainwater flow chamber and
the valve chamber and blocking the lower rainwater hole
when it is disposed in the rainwater flow chamber; the
-12-

storage chamber for storing the rainwater having reached
the valve chamber from the rainwater flow chamber; the
valve-seat opening portion capable of being blocked with
the ball valve when the ball valve is disposed in the valve
chamber; the upper guiding member for guiding the rising
ball valve from the rainwater flow chamber to the valve
chamber; and the lower guiding member for guiding the
lowering ball valve from the valve chamber to the rainwater
flow chamber. This configuration allows the initial
rainwater containing a relatively large quantity of dusts
can be surely prevented from flowing down from the
rainwater flow chamber to the lower vertical pipe by
blocking the lower rainwater hole with the ball valve.
After the storage chamber is filled with the initial
rainwater, the ball valve is floated, and then, clean
rainwater with a relatively small quantity of dusts flowing
down from the upper vertical pipe can be made to flow into
the lower vertical pipe through the lower rainwater hole.
[0015]
On the other hand, when the water level is raised,
the ball valve blocks the valve-seat opening port and seals
the valve chamber. Therefore, even if the filtration
device is disposed below the rainwater intake of the
storage tank, the rainwater does not leak out of the valve-
seat opening port of the filtration device but the
rainwater can be made to flow into the storage tank. And
by detachably attaching the first strainer to the lower
-13-

rainwater hole, the foreign substances mixed in the
rainwater flowing into the lower vertical pipe through the
lower rainwater hole can be eliminated by the first
strainer, and by detachably attaching the second strainer
to the storage chamber, the foreign substances mixed in the
initial rainwater can be caught by the second strainer.
Moreover, by detachably attaching the first and the second
strainers through the valve-seat opening port, the
inspection work is facilitated.
Also, in the rainwater storage device comprising the
filtration device; the rainwater storage tank having the
rainwater intake disposed above the filtration device; and
the rainwater guide pipe with one end connected to the
lower end of the lower vertical pipe and the other end
connected to the rainwater intake, in which the upper end
of the upper vertical pipe is disposed above the rainwater
intake; the rainwater filtered by the filtration device and
stored in each inside of the lower vertical pipe and the
rainwater guide pipe flows into the storage tank and stored
therein when the water level is raised and reaches the
rainwater intake. As a result, the stored rainwater can be
taking out for usage as necessary.
Brief Description of the Drawings
[0016]
Fig. 1 is A-A sectional view of Fig. 5 illustrating a
structure of a filtration device of an embodiment of the
-14-

present invention;
Fig. 2 is a sectional view corresponding to Fig. 1
illustrating a state where a ball valve blocks a valve-seat
opening portion and seals a valve chamber;
Fig. 3 is a sectional view corresponding to Fig. 1
illustrating a state where a lower guiding member is
folded;
Fig. 4 is a sectional view corresponding to Fig. 1
illustrating a state where the ball valve drops into a
storage chamber;
Fig. 5 is C-C sectional view of the filtration device
used in a rainwater storage device shown in Fig. 8;
Fig. 6 is an enlarged sectional view of D part in Fig.
1 illustrating a drain valve with its large-diameter hole
crossing the shaft center of a center hole;
Fig. 7 is a sectional view corresponding to Fig. 6
illustrating a drain valve having its large-diameter hole
according to the shaft center of the center hole;
Fig. 8 is a block diagram of the rainwater storage
device using the filtration device; and
Fig. 9 is a block diagram of another rainwater
storage device using the filtration device;
Explanation of Reference Numerals
[0017]
10 Rainwater storage device
11 Rainwater storage tank
lla Rainwater intake
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16 Rainwater guide pipe
17 Drain valve
20 Filtration device
21a Upper vertical pipe
21b Lower vertical pipe
22 Housing
23 Rainwater flow chamber
23a Upper rainwater hole
23b Lower rainwater hole
24 Valve chamber
24b Valve-seat opening portion
25 Projection
26 First strainer
27 Storage chamber
27b Small-diameter hole
29 Ball valve
31 Upper guiding member
32 Lower guiding member
33 Second strainer
41 Check valve
Best Mode for Carrying Out the Invention
[0018]
A best mode for carrying out the present invention
will be described below referring to the attached drawings.
As shown in Fig. 8, a rainwater storage device 10 of
the present invention comprises a rainwater storage tank 11
-16-

for storing rainwater; a rainwater inflow pipe 12 for
supplying the rainwater to the rainwater storage tank 11;
an upper vertical pipe 21a having its upper end connected
to the lower end of the rainwater inflow pipe 12; a lower
vertical pipe 21b coaxial with the upper vertical pipe 21a;
and a flowing-down rainwater filtration device 20
interposed between the upper vertical pipe 21a and the
lower vertical pipe 21b. The rainwater inflow pipe 12
shown in the figure is a cylindrical body with the upper
end connected to a rain gutter 14 provided at the edge of a
roof 13a of a house 13 and it is configured such that rain
dropping on the roof 13a of the house 13 flows into the
rain gutter 14 and is collected, and the collected
rainwater enters the rainwater inflow pipe 12 from the rain
gutter 14 and flows down to the upper vertical pipe 21a.
The filtration device 20 filtrates and guides the rainwater
flowing down the upper vertical pipe 21a to the lower
vertical pipe 21b, and the lower end of the lower vertical
pipe 21b and the storage tank 11 are connected via a
rainwater guide pipe 16.
[0019]
As shown in Figs. 1 to 5, the filtration device 20 is
provided with a housing 22 to which the lower part of the
upper vertical pipe 21a and the upper part of the lower
vertical pipe 21b attached from above and below. The
housing 22 is formed in an oval shape with the major axis
approximately twice as large as the outer diameters of the
-17-

vertical pipes 21a, 21b when seen from above and the minor
axis slightly larger than the outer diameter of the
vertical pipes 21a, 21b (Fig. 5) and is assembled by
fitting a lower lid 22b made of a resin molding into the
periphery of an upper lid 22a. At an upper part of one end
of the housing 22, an upper short pipe 22c to which the
lower part of the upper vertical pipe 21a is inserted is
provided, and at a lower part of the one end of the housing
22 opposed to the upper short pipe 22c, a lower short pipe
22d into which the upper part of the lower vertical pipe
21b is fitted is provided. By inserting the lower part of
the upper vertical pipe 21a into the upper short pipe 22c
and fitting the upper part of the lower vertical pipe 21b
into the lower short pipe 22d, the upper and lower vertical
pipes 21a and 21b are attached to the housing 22 from above
and below, respectively. And in the inside of the housing
22, a rainwater flow chamber 23 interposed between the
upper vertical pipe 21a and the lower vertical pipe 21b and
a valve chamber 24 adjacent to the rainwater flow chamber
23 are formed.
[0020]
As shown in Figs. 1 to 4, at the upper part of the
rainwater flow chamber 23, an upper rainwater hole 23a
which has the rainwater flow chamber 23 communicate with
the upper vertical pipe 21a is formed to have rainwater
flowing down the upper vertical pipe 21a flow into the
rainwater flow chamber 23. On the other hand, at the lower
-18-

part of the rainwater flow chamber 23, a lower rainwater
hole 23b which has the rainwater flow chamber 23
communicate with the lower vertical pipe 21b is formed to
have the rainwater flowing into the rainwater flow chamber
23 flow down to the lower vertical pipe 21b. On the inner
peripheral edge of the lower rainwater hole 23b, a ring-
shaped projection 25 is formed so as to project upward, and
at the upper edge of the projection 25, the peripheral edge
of the first strainer 26 is installed so that the first
strainer 26 is detachably attached to the lower rainwater
hole 23b. The first strainer 2 6 in this embodiment is
molded from a metal mesh into the bottomed cylindrical
shape and the outer diameter of the bottomed cylindrical
strainer 2 6 is formed slightly smaller than the inner
diameter of the ring-shaped projection 25, and a flange 26a
which can be installed at the upper end of the projection
25 is formed at the peripheral edge of the opening portion
of the strainer 26. By installing the flange 26a at the
projection 25 and inserting the bottomed cylindrical
portion into the lower rainwater hole 23b, the strainer 26
is detachably attached to the lower rainwater hole 23b.
[0021]
On the other hand, another short pipe 22e is provided
adjacently to the lower short pipe 22d at the lower part of
the other end of the housing 22. A bottomed cylindrical
storage case 27a with its inside forming the storage
chamber 27 is fitted on the another short pipe 22e from
-19-

below so that the storage case 27a is provided at the lower
part of the housing 22. At the lower part of the valve
chamber 24, an inflow hole 24a is formed which has the
valve chamber 24 communicate with the storage chamber 27 so
that the rainwater having reached the valve chamber 24 from
the rainwater flow chamber 23 further flows down to the
storage chamber 27 and is stored in the storage chamber 27.
At the bottom portion of the storage chamber 27, a drain
valve 28 for draining the rainwater flowing into the
storage chamber 27 and a small-diameter hole 27b for
draining the rainwater, though slightly, are provided.
[0022]
The small-diameter hole 27b has a circular section
and a diameter of 0.8 to 1.5 mm. This small-diameter hole
27b is provided in order to gradually drain the initial
rainwater having flown into and having been stored in the
storage chamber 27 to the outside and to empty the storage
chamber 27 after the rainfall stops, allowing to avoid a
situation that the rainwater remains stored in the storage
chamber 27 even after the rainfall stops. Therefore, this
filtration device 20 is configured such that the presence
of this small-diameter hole 27b allows the initial
rainwater to be surely stored in the storage chamber 27
when a rainfall starts again after it stopped once.
However, this small-diameter hole 27b is relatively easy to
be clogged, and for preventing the clogging, a vertically
long mesh 27c covering the small-diameter hole 27b from
-20-

above is provided at the storage chamber 27. This mesh 27c
is configured to be formed vertically long so that a
filtration area can be expanded and the clogging of the
mesh 27c can be prevented.
[0023]
As shown in Figs. 6 and 7, the drain valve 28 is
provided with a cylindrical body 28a and a rotary valve 28c
which shuts a lower rainwater hole 28b of the cylindrical
body 28a and is provided rotatably. The lower rainwater
hole 28b has a circular section and a diameter of 8 to 15
mm. At the rotary valve 28c, a large-diameter hole 28d
with the same hole diameter as that of the lower rainwater
hole 28b is formed. This drain valve 28 is configured such
that by rotating the rotary valve 28c so as to cross the
shaft center of the large-diameter hole 28d with the shaft
center of the lower rainwater hole 28b as shown in Fig. 6,
the rainwater flowing into the storage chamber 28 is stored
in the storage chamber 27 and by rotating the rotary valve
28c so as to make the shaft center of the large-diameter
hole 28d accord to the shaft center of the lower rainwater
hole 28d, the rainwater stored in the storage chamber 27 is
drained to the outside relatively rapidly through the
large-diameter hole 28d.
[0024]
Returning to Figs. 1 to 4, the ball valve 29 movable
between the rainwater flow chamber 23 and the valve chamber
24 is accommodated in the housing 22. The ball valve 29 is
-21-

a ball with the specific gravity less than 1. The valve-
seat opening portion 24b capable of sealing the valve
chamber 24 by being blocked with the ball valve 29 is
formed so as to open the valve chamber 24 to the upper part
of the housing 22 opposed to the storage chamber 27. A
packing 30 is fitted on the edge of the valve-seat opening
portion 24b, and the ball valve 29 is configured to be
floated in the valve chamber 24 and brought into contact
with the packing 30 when the rainwater in the rainwater
flow chamber 23 is not less than a predetermined amount, by
which the ball valve 29 blocks the valve-seat opening
portion 24b and seals the valve chamber 24. And the valve-
seat opening portion 24b is sized to enable the first
strainer 26 to be inserted; a lid body 22f is detachably
provided on the top face of the housing 22 so as to cover
the valve-seat opening portion 24b; and a knob portion 22g
is formed on the lid body to be grasped by a worker.
[0025]
Also, in the rainwater flow chamber 23, an upper
guiding member 31 is provided for guiding the ball valve 29
rising in the rainwater flow chamber 23 from the rainwater
flow chamber 23 to the valve chamber 24, and in the valve
chamber 24, a lower guiding member 32 is provided for
guiding the ball valve 29 lowering in the valve chamber 24
from the valve chamber 24 to the rainwater flow chamber 23.
The upper guiding member 31 is a plate material provided at
the upper part of the rainwater flow chamber 23, crossing
-22-

the rainwater flow chamber 23 while being inclined upward
to the valve chamber 24 (Fig. 5). On the other hand, the
lower guiding member 32 is a plate material provided at the
lower part of the valve chamber 24, crossing the valve
chamber 24 while being inclined downward to the rainwater
flow chamber 23 and configured capable of being folded.
This lower guiding plate 32 is configured so as to guide in
the extended state the ball valve 29 lowering in the valve
chamber 24 from the valve chamber 24 to the rainwater flow
chamber 23 and to allow the ball valve 29 to move between
the valve chamber 24 and the storage chamber 27 in the
folded state.
[0026]
The storage chamber 27 is configured capable to
accommodate the ball valve 29, and a bottomed cylindrical
second strainer 33 for filtrating the rainwater flowing
from the valve chamber 24 to the storage chamber 27 is
detachably attached to the storage chamber 27. This second
strainer 33 is formed so as to pass through the valve-seat
opening portion 24b. In this embodiment, a horizontal flat
board 34 vertically partitioning the storage chamber 27 is
provided, and a center hole 34a is formed on this flat
board 34, to which the second strainer 33 is detachably
attached. . This second strainer 33 is molded from a metal
mesh into the bottomed cylindrical state, and its outer
diameter is formed slightly smaller than the inner diameter
of the center hole 34a, and a flange 33a which can be
-23-

attached to the hole edge of the center hole 34a is formed
at the peripheral edge of the opening portion of the second
strainer 33. The second strainer 33 is detachably attached
to the storage chamber 27 by inserting the bottomed
cylindrical portion into the center hole 34a and installing
the flange 33a at the hole edge of the center hole 34a.
As shown in Fig. 8, a rainwater intake lla is formed
on the upper sidewall of the rainwater storage tank 11, and
the rainwater intake lla is formed above the filtration
device 20. The upper end of the upper vertical pipe 21a is
configured to be disposed above the rainwater intake lla.
One end of the rainwater guide pipe 16 is connected to the
lower end of the lower vertical pipe 21b while the other
end of the rainwater guide pipe 16 is connected to the
rainwater intake lla. This configuration may cause a case
where the rainwater is collected in each inside of the
upper vertical pipe 21a, the lower vertical pipe 21b and
the rainwater guide pipe 16. Therefore a drain valve 17
which can drain the rainwater in each inside of the upper
vertical pipe 21a, the lower vertical pipe 21b and the
rainwater guide pipe 16 to the outside is provided at the
lower end of the vertical pipe 21.
[0027]
Next, operation of the rainwater storage device
configured as above will be described.
When rain drops on a roof 13a of a house 13, the rain
flows along the inclination of the roof 13a into the rain
-24-

gutter 14 and is collected there. The collected rainwater
enters the rainwater inflow pipe 12, flows down inside the
rainwater inflow pipe 12 and reaches the filtration device
20 through the upper vertical pipe 21a. In the filtration
device 20 at the beginning of rainfall, the rainwater in
the rainwater flow chamber 23 is less than a predetermined
amount, and thus, as shown in Fig. 1, the ball valve 29 is
guided by the lower guiding member 32 from the valve
chamber 24 to the rainwater flow chamber 23 and blocks the
lower rainwater hole 23b in the rainwater flow chamber 23.
Therefore, the majority of the initial rainwater which
flows from the upper vertical pipe 21a to the rainwater
flow chamber 23 at the beginning of the rainfall is
received by the peripheral face of the ring-shaped
projection 25, guided to the valve chamber 24 and further
flows down into the storage chamber 27. Thus, though the
initial rainwater at the beginning of the rainfall contains
a relatively large quantity of dusts, it can be surely
prevented that the initial rainwater containing a
relatively large quantity of dusts flows from the rainwater
flow chamber 23 through the lower rainwater hole 23b to the
lower vertical pipe 21b. Here, the relatively large
quantity of dusts contained in the initial rainwater is
caught by the second strainer 33 provided at the storage
chamber 27, the filtrated rainwater reaches the bottom
portion of the storage chamber 27 and is stored in this
storage chamber 27.
-25-

[0028]
When the rainfall continues and the rainwater amount
flowing down through the rainwater flow pipe 12 increases,
exceeding the amount drained to the outside through the
small-diameter hole 27b formed at the storage chamber 27,
the rainwater overflows out of the storage chamber 27 and
begins to be collected in the rainwater flow chamber 23 and
the valve chamber 24. And when the level of the collected
water exceeds the upper end of the ring-shaped projection
25, the ball valve 29 with the specific gravity less than 1
floats, and then allowing clean rainwater with a relatively
small quantity of dusts flowing down from the upper
vertical pipe 21a to flow from the rainwater flow chamber
23 through the lower rainwater hole 23b to the lower
vertical pipe 21b. Here, since the first strainer 26 is
attached to the lower rainwater hole 23b so as to block the
lower rainwater hole 23b, mixed foreign substances is
eliminated by the strainer 26 from the rainwater flowing
down through the lower rainwater hole 23b to the lower
vertical pipe 21b.
[0029]
On the other hand, when the rainwater amount flowing
down through the rainwater inflow pipe 12 is increased, the
rainwater is collected inside the valve chamber 24 and the
water level is raised, causing the ball valve 29 to float
in the rainwater flow chamber 23. As shown in Fig. 2, the
ball valve 29 floating in the rainwater flow chamber 23 is
-26-

guided by the upper guiding member 31 from the rainwater
flow chamber 23 to the valve chamber 24 and is brought into
contact with the valve-seat opening portion 24b from below
in the valve chamber 24 and seals the valve chamber 24.
Therefore, as shown in Fig. 8, even if the filtration
device 20 is disposed below the rainwater intake lla of the
storage tank 11, a situation that the rainwater does not
flow into the storage tank 11 but is drained outside from
the valve-seat opening portion 24b can be avoided. And at
a time when the water level of the rainwater collected in
each inside of the upper vertical pipe 21a, the lower
vertical pipe 21b and the rainwater guide pipe 16 is raised
and reaches the rainwater intake lla, the rainwater flows
into the storage tank 11 from the intake lla and is stored
therein. The rainwater stored in the storage tank 11 can
be taken out of a faucet l1b as necessary and used for
watering or car wash. Here, since the upper end of the
upper vertical pipe 21a is disposed above the rainwater
intake lla, a situation that the rainwater does not flow
into the storage tank 11 but is discharged from the upper
end of the upper vertical pipe 21a to the outside can be
avoided.
[0030]
Here, eliminated foreign substances accumulate on the
first and the second strainers 26, 33 of the filtration
device 20. Thus, it is necessary to take out these
strainers 26, 33 and wash them per predetermined period.
-27-

For taking out these strainers 26, 33, the lid body 22f is
removed to expose the valve-seat opening portion 24b when
it is not raining. Then, since the ball valve 29 has been
guided by the lower guiding member 32 into the rainwater
flow chamber 23 and has blocked the lower rainwater hole
23b, the valve-seat opening port 24b is open. Thus, as
show in Fig. 3, by reaching the lower guiding member 32
through the valve-seat opening portion 24b and folding it,
the second strainer 33 can be taken out of the storage
chamber 27 through the valve-seat opening portion 24b.
Also, by folding the lower guiding member 32 and dropping
the ball valve 29 which blocks the lower channel hole 23b
into the storage chamber 27, the first strainer 26 can be
taken out of the rainwater flow chamber 23 through the
valve-seat opening portion 24b. Thus, the first and the
second strainers 26, 33 can be easily taken out of the
housing 22, enabling the inspection and cleaning to be
carried out relatively easily.
[0031]
On the other hand, in a case immediately after the
rainfall stops, where the ball valve 29 blocks the valve-
seat opening portion 24b when the lid body 22f is removed,
the rotary valve 28c of the drain valve 28 is rotated so
that the shaft center of the large-diameter hole 28d
accords to the shaft center of the lower rainwater hole 28b
as shown in Fig. 7. Then the rainwater inside the storage
chamber 27 is rapidly drained to the outside so as to open
-28-

the valve-seat opening portion 24b. The first and the
second strainers 26, 33 can be taken out through this
opening portion 24b. When the drain valve 28 is opened,
the rainwater in the storage chamber 27 can be discharged
to the outside together with the dusts in the storage
chamber 27. Moreover, in a case some time after the
rainfall stops, where the rainwater in the storage chamber
27 is drained from the small-diameter hole 27b to the
outside and the storage chamber 27 has been emptied, by
pouring water into the storage chamber 27 using a bucket or
a watering pot from the valve-seat opening portion 24b and
opening the drain valve 28, the dusts can be discharged
with the poured rainwater to the outside.
[0032]
In the above embodiment, the rainwater storage device
comprising the rainwater storage tank 11 in which the
rainwater intake lla is formed on the upper sidewall was
described, but as shown in Fig. 9, the rainwater intake lla
may be formed on the lower sidewall of the rainwater
storage tank 11. However, in this case, when the water
level of the rainwater in the rainwater storage tank 11 is
higher than the filtration device 20, the rainwater
backflows from the rainwater intake lla to the rainwater
guide pipe 16 and flows out to the outside through the
small-diameter hole 27b of the filtration device 20. Thus,
it is necessary to provide a check valve 41 configured to
prevent a rainwater flow from the rainwater guide pipe 16
-29-

toward the lower vertical pipe 21b at the lower end of the
lower vertical pipe 21b or at the rainwater guide pipe 16.
The check valve 41 shown in Fig. 9 is provided with a valve
seat 41a in which a round hole 41b is formed at the center
and with a ball valve 41c which is provided below the valve
seat 41a and is capable of sealing the round hole 41b, and
when the ball valve 41c seals the round hole 41b, it is
prevented that the rainwater flows from the rainwater guide
pipe 16 toward the lower vertical pipe 21b. By providing
the check valve 41 as above, the rainwater intake lla can
be attached at a low position of the rainwater storage tank
11, for example, close to the bottom. When the rainwater
intake lla is disposed at the low position of the rainwater
storage tank 11, the length of the rainwater guide pipe 16
having the other end connected to the rainwater intake lla
and exposed above the ground can be reduced and a visual
impression of being relatively long thereof is prevented
from being given, which can improve appearance of the
entire device.
[0033]
Also, in the above embodiment, a case that the lower
end of the rainwater inflow pipe 12 connected to the rain
gutter 14 is connected to the upper end of the upper
vertical pipe 21a was described, but the upper end of the
upper vertical pipe 21a may be directly connected to the
rain gutter 14.
Moreover, in the above embodiment, the first and the
-30-

second strainers 2 6, 33 molded from a metal mesh into the
bottomed cylinder state were described, but the first and
the second strainers 26, 33 may be formed from a mesh made
of a resin into a bag state, for example, as long as it can
filtrate rainwater. Particularly if the first and the
second strainers 26, 33 are formed by a resin with
flexibility, the first and the second strainers 26, 33 can
be taken out of the valve-seat opening portion 24b in the
deformed state, which improves degrees of freedom in the
design.
Industrial Applicability
[0034]
A flowing-down rainwater filtration device can be
installed at a relatively low place below the full water
level of a storage tank.
-31-

What is claimed is:
1. A flowing-down rainwater filtration device (20)
interposed between an upper vertical pipe (21a) and a lower
vertical pipe (21b) coaxial with the upper vertical pipe
(21a) for filtrating rainwater flowing down through the
upper vertical pipe (21a) and guiding the rainwater to the
lower vertical pipe (21b), comprising:
a housing (22) attached to a lower part of the upper
vertical pipe (21a) and an upper part of the lower vertical
pipe (21b) from above and below and having a rainwater
flow chamber (23) interposed between the upper vertical
pipe (21a) and the lower vertical pipe (21b) and a valve
chamber (24) adjacent to the rainwater flow chamber (23);
an upper rainwater hole (23a) formed at an upper part
of the rainwater flow chamber (23) for having the rainwater
flow chamber (23) communicate with the upper vertical pipe
(21a) so as to have the rainwater flowing down through the
upper vertical pipe (21a) flow into the rainwater flow
chamber (23);
a lower rainwater hole (23b) formed at a lower part
of the rainwater flow chamber (23) for having the rainwater
flow chamber (23) communicate with the lower vertical pipe
(21b) so as to have the rainwater flowing into the
rainwater flow chamber (23) flow down to the lower vertical
pipe (21b);
a ball valve (29) with a specific gravity less than 1
and accommodated in the housing (22) movably between the
-32-

rainwater flow chamber (23) and the valve chamber (24) for
blocking the lower rainwater hole (23b) when the rainwater
in the rainwater flow chamber (23) is less than a
predetermined amount and the ball valve is disposed in the
rainwater flow chamber (23);
a storage chamber (27) communicating with the valve
chamber (24) and provided at a lower part of the housing
(22), for storing the rainwater having reached the valve
chamber (24) from the rainwater flow chamber (23);
a valve-seat opening portion (24b) formed at an upper
part of the housing (22) opposed to the storage chamber
(27) so as to open the valve chamber (24) and being capable
of sealing the valve chamber (24) by being blocked with the
ball valve (29) when the rainwater in the rainwater flow
chamber (23) is not less than the predetermined amount and
the ball valve (29) is disposed in the valve chamber (24);
an upper guiding member (31) provided at the
rainwater flow chamber (23) and for guiding the ball valve
(29) rising in the rainwater flow chamber (23) from the
rainwater flow chamber (23) to the valve chamber (24); and
a lower guiding member (32) provided at the valve
chamber (24) and for guiding the ball valve (29) lowering
in the valve chamber (24) from the valve chamber (24) to
the rainwater flow chamber (23).
2. The flowing-down rainwater filtration device
according to claim 1, wherein a first strainer (26) for
-33-

filtrating rainwater of the rainwater flow chamber (23) and
having it flow down into the lower vertical pipe (21b), is
detachably attached to the lower rainwater hole (23b)and is
configured capable of being taken in/out through the valve-
seat opening portion (24b); the storage chamber (27) is
configured capable of accommodating the ball valve (29);
the lower guiding member (32) is foldably configured so as
to guide the ball valve (29) lowering in the valve chamber
(24) from the valve chamber (24) to the rainwater flow
chamber (23) in the extended state and to allow the ball
valve (29) to move between the valve chamber (24) and the
storage chamber (27) in the folded state.
3. The flowing-down rainwater filtration device
according to claim 2, wherein a second strainer (33) for
filtrating rainwater flowing into the storage chamber (27)
through the valve chamber (24) from the rainwater flow
chamber (23), is detachably attached to the storage chamber
(27) and is configured capable of being taken in/out
through the valve-seat opening portion (24b); and a small-
diameter hole (27b) for discharging the rainwater flowing
into the storage chamber (27) to the outside is provided at
a lower part of the storage chamber (27).
4. The flowing-down rainwater filtration device
according to claim 2 or 3, wherein a ring-shaped projection
(25) is formed so as to project upward on the inner
-34-

peripheral edge of the lower rainwater hole (23b), and the
peripheral edge of the first strainer (26) is disposed at
the upper edge of the projection (25) so that the first
strainer (26) is detachably attached to the lower rainwater
hole (23b).
5. A rainwater storage device comprising:
the filtration device (20) according to any one of
claims 1 to 4;
a rainwater storage tank (11) having the rainwater
intake (lla) disposed above the filtration device (20); and
a rainwater guide pipe (16) with one end connected to
the lower end of the lower vertical pipe (21b) and the
other end connected to the rainwater intake (lla), wherein
the upper end of the upper vertical pipe (21a) is disposed
above the rainwater intake (lla).
6. The rainwater storage device according to claim 5,
wherein a drain valve (17) capable of discharging rainwater
in each inside of the upper vertical pipe (21a), the lower
vertical pipe (21b) and the rainwater guide pipe (16) to
the outside is provided at the lower vertical pipe (21b) or
the rainwater guide pipe (16).
7. The rainwater storage device according to claim 5 or
6, wherein a check valve (41) for preventing a rainwater
flow from the rainwater guide pipe (16) to the lower
-35-

vertical pipe (21b) is provided at the lower end of the
lower vertical pipe (21b) or the rainwater guide pipe (16).

A filtration device, which can be installed at a
relatively low place below the full water level of a
storage tank, is obtained.
The filtration device is provided with a housing 22
attached to a lower part of an upper vertical pipe 21a and
an upper part of a lower vertical pipe 21b from above and
below and having a rainwater flow chamber 23 and a valve
chamber 24; a ball valve 29 with a specific gravity less
than 1 and accommodated in the housing movably between the
rainwater flow chamber and the valve chamber for blocking a
lower rainwater hole 23b in the rainwater flow chamber; a
storage chamber 27 for storing the rainwater having reached
the valve chamber from the rainwater flow chamber; a valve-
seat opening portion 24b capable of being blocked with the
ball valve so as to seal the valve chamber; an upper
guiding member 31 for guiding the rising ball valve from
the rainwater flow chamber to the valve chamber; and a
lower guiding member 32 for guiding the lowering ball valve
from the valve chamber to the rainwater flow chamber. A
first strainer 26 configured capable of being taken in/out
through the valve-seat opening portion is detachably
attached to the lower rainwater hole, and a second strainer
33 for filtrating the rainwater flowing into the storage
chamber is detachably attached to the storage chamber.

Documents:

01620-kolnp-2007-abstract.pdf

01620-kolnp-2007-claims.pdf

01620-kolnp-2007-correspondence others 1.1.pdf

01620-kolnp-2007-correspondence others 1.2.pdf

01620-kolnp-2007-correspondence others 1.3.pdf

01620-kolnp-2007-correspondence others 1.4.pdf

01620-kolnp-2007-correspondence others.pdf

01620-kolnp-2007-description complete.pdf

01620-kolnp-2007-drawings.pdf

01620-kolnp-2007-form 1.pdf

01620-kolnp-2007-form 18.pdf

01620-kolnp-2007-form 2.pdf

01620-kolnp-2007-form 3.pdf

01620-kolnp-2007-form 5.pdf

01620-kolnp-2007-gpa.pdf

01620-kolnp-2007-international publication.pdf

01620-kolnp-2007-international search report 1.1.pdf

01620-kolnp-2007-international search report.pdf

01620-kolnp-2007-pct request form.pdf

01620-kolnp-2007-priority document 1.1.pdf

01620-kolnp-2007-priority document.pdf

1620-KOLNP-2007-(19-12-2011)-FORM-27.pdf

1620-KOLNP-2007-ABSTRACT 1.1.pdf

1620-KOLNP-2007-ABSTRACT-1.2.pdf

1620-KOLNP-2007-AMANDED CLAIMS-1.1.pdf

1620-KOLNP-2007-AMANDED CLAIMS.pdf

1620-KOLNP-2007-CORRESPONDENCE OTHERS 1.5.pdf

1620-KOLNP-2007-CORRESPONDENCE-1.6.pdf

1620-KOLNP-2007-CORRESPONDENCE1.3.pdf

1620-KOLNP-2007-DESCRIPTION (COMPLETE) 1.1.pdf

1620-KOLNP-2007-DESCRIPTION (COMPLETE)-1.2.pdf

1620-KOLNP-2007-DRAWINGS 1.1.pdf

1620-KOLNP-2007-DRAWINGS-1.2.pdf

1620-KOLNP-2007-EXAMINATION REPORT REPLY RECIEVED.pdf

1620-KOLNP-2007-EXAMINATION REPORT.pdf

1620-KOLNP-2007-FORM 1 1.1.pdf

1620-KOLNP-2007-FORM 1-1.2.pdf

1620-KOLNP-2007-FORM 18.pdf

1620-KOLNP-2007-FORM 2 1.1.pdf

1620-KOLNP-2007-FORM 2-1.2.pdf

1620-KOLNP-2007-FORM 26.pdf

1620-KOLNP-2007-FORM 3 1.1.pdf

1620-KOLNP-2007-FORM 3-1.2.pdf

1620-KOLNP-2007-FORM 3-1.3.pdf

1620-KOLNP-2007-FORM 5-1.1.pdf

1620-KOLNP-2007-FORM 5-1.2.pdf

1620-KOLNP-2007-GRANTED-ABSTRACT.pdf

1620-KOLNP-2007-GRANTED-CLAIMS.pdf

1620-KOLNP-2007-GRANTED-DESCRIPTION (COMPLETE).pdf

1620-KOLNP-2007-GRANTED-DRAWINGS.pdf

1620-KOLNP-2007-GRANTED-FORM 1.pdf

1620-KOLNP-2007-GRANTED-FORM 2.pdf

1620-KOLNP-2007-GRANTED-LETTER PATENT.pdf

1620-KOLNP-2007-GRANTED-SPECIFICATION.pdf

1620-KOLNP-2007-OTHERS 1.1.pdf

1620-KOLNP-2007-OTHERS-1.2.pdf

1620-KOLNP-2007-OTHERS.pdf

1620-KOLNP-2007-OTHERS1.3.pdf

1620-KOLNP-2007-PETITION UNDER RULE 137.pdf

1620-KOLNP-2007-REPLY TO EXAMINATION REPORT1.1.pdf

1620-KOLNP-2007-TRANSLATED COPY OF PRIORITY DOCUMENT.pdf

abstract-01620-kolnp-2007.jpg


Patent Number 248399
Indian Patent Application Number 1620/KOLNP/2007
PG Journal Number 28/2011
Publication Date 15-Jul-2011
Grant Date 12-Jul-2011
Date of Filing 07-May-2007
Name of Patentee TOTETU MFG. CO.LTD
Applicant Address 11-21, NISHI-GOTANDA 8-CHOME, SHINAGAWA-KU, TOKYO
Inventors:
# Inventor's Name Inventor's Address
1 TAKAI, SEIICHIRO C/O. TOTETU MFG. CO.LTD 11-21, NISHI-GOTANDA 8-CHOME, SHINAGAWA-KU, TOKYO
PCT International Classification Number E03B 3/02, E03B 3/03
PCT International Application Number PCT/JP2005/020068
PCT International Filing date 2005-11-01
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 2004-339708 2004-11-25 Japan