U.S. patent application number 16/888486 was filed with the patent office on 2020-12-03 for drain socket and drain socket-equipped toilet bowl.
This patent application is currently assigned to LIXIL Corporation. The applicant listed for this patent is LIXIL Corporation. Invention is credited to Takamasa INA, Hidekazu MIYAKE, Maiko NAKAGAWA, Naoto YONEDU.
Application Number | 20200378103 16/888486 |
Document ID | / |
Family ID | 1000004881999 |
Filed Date | 2020-12-03 |
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United States Patent
Application |
20200378103 |
Kind Code |
A1 |
NAKAGAWA; Maiko ; et
al. |
December 3, 2020 |
DRAIN SOCKET AND DRAIN SOCKET-EQUIPPED TOILET BOWL
Abstract
A drain socket includes a first connection part connected to a
drain pipe of a toilet bowl; a second connection part connected to
a drain piping in a floor or the like; and a drain channel body
connecting the first connection part and the second connection
part. The drain channel body includes an inclined part inclined to
one side in the front-back direction toward a lower side. A
restriction part is provided at an upstream end portion of the
drain channel body. A surface of the restriction part located on
the one side where the inclined part is inclined has a portion
where a horizontal distance from a center C of the first connection
part increases from the center of the surface in the left-right
direction toward an end side of the surface in the left-right
direction.
Inventors: |
NAKAGAWA; Maiko; (Tokyo,
JP) ; INA; Takamasa; (Tokyo, JP) ; MIYAKE;
Hidekazu; (Tokyo, JP) ; YONEDU; Naoto; (Tokyo,
JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
LIXIL Corporation |
Tokyo |
|
JP |
|
|
Assignee: |
LIXIL Corporation
Tokyo
JP
|
Family ID: |
1000004881999 |
Appl. No.: |
16/888486 |
Filed: |
May 29, 2020 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
E03D 11/16 20130101 |
International
Class: |
E03D 11/16 20060101
E03D011/16 |
Foreign Application Data
Date |
Code |
Application Number |
May 31, 2019 |
JP |
2019-102195 |
Claims
1. A drain socket comprising: a first connection part connected to
a drain pipe of a toilet bowl having a front side and a back side;
a second connection part connected to a drain piping; a drain
channel body connecting the first connection part and the second
connection part, the drain channel body comprising an inclined part
inclined to with respect a vertical direction, so that a lower end
thereof is positioned more toward one of the front side or the back
side of the toilet bowl than a upper end thereof; and a restriction
part provided at an upstream end portion of the drain channel body,
wherein the restriction part extends inwardly toward a center of
the first connection part so as to have a side edge surface at the
one, and in a plan view of the restriction part, the side edge
surface is curved such that a distance between the center of the
first connection part and the side edge surface increases from a
middle of the side edge surface toward ends of the side edge
surface in the plan view.
2. The drain socket of claim 1, wherein a surface of the inclined
part on a side opposite to the one is more inclined from the
vertical direction on an upstream side than on a downstream
side.
3. The drain socket of claim 1, wherein an inclined surface is
provided on a downstream side of the side edge surface of the
restriction part, the inclined surface being inclined to a side
opposite to the one toward a lower side in the vertical
direction.
4. The drain socket of claim 1, wherein a portion of the
restriction part located on the one has a step surface extending in
a direction crossing the vertical direction.
5. The drain socket of claim 1, wherein at the one of the toilet
bowl, an outer edge of the drain pipe is located inside an inner
edge of the restriction portion with respect to a horizontal
configuration of the drain pipe and the restriction portion.
6. A drain socket-equipped toilet bowl, comprising: a toilet bowl
having a drain pipe of the toilet bowl; and the drain socket of
claim 1.
7. A drain socket comprising: a first connection part connected to
a drain pipe of a toilet bowl having a front side and a back side;
a second connection part connected to a drain piping; a drain
channel body connecting the first connection part and the second
connection part, the drain channel body comprising an inclined part
inclined to with respect a vertical direction, so that a lower end
thereof is positioned more toward one of the front side or the back
side of the toilet bowl than a upper end thereof; and a restriction
part provided at an upstream end portion of the drain channel body,
wherein a surface of the restriction part located on the one has a
portion where a horizontal distance between a center of the first
connection part and a side edge surface of the restriction part
increases from a center of the surface in a left-right direction
toward an end side of the surface in the left-right direction.
8. The drain socket of claim 7, wherein a surface of the inclined
part on a side opposite to the one has a gradient closer to
vertical on a downstream side than on an upstream side.
9. The drain socket of claim 7, wherein an inclined surface is
provided on a downstream side of the side edge surface of the
restriction part, the inclined surface being inclined to a side
opposite to the one toward a lower side in the vertical
direction.
10. The drain socket of claim 7, wherein a portion of the
restriction part located on the one has a step surface extending in
a direction crossing the vertical direction.
11. The drain socket of claim 7, wherein a portion of the
restriction part located on the one is located on the one relative
to a portion, located on the one, of the drain pipe part of the
toilet bowl.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the priority of Japanese Application
No. 2019-102195 filed May 31, 2019, the entire contents of which
are incorporated herein by reference.
FIELD OF THE DISCLOSURE
[0002] The present disclosure relates to a drain socket and a drain
socket-equipped toilet bowl.
BACKGROUND OF THE DISCLOSURE
[0003] Conventionally, a drain socket that connects a drain pipe
part (drain pipe) of a toilet bowl and a drain piping provided in a
floor or the like is known. The drain socket generally includes a
first connection part connected to a drain pipe part of a toilet
bowl, a second connection part connected to drain piping provided
in a floor or the like, and a drain channel body part (drain
channel body) connecting the first connection part and the second
connection part. Some drain sockets have an inclined part inclined
backward toward a downstream side. In a drain socket having such an
inclined part, for example, JP 2008-184745 A describes a drain
socket in which a restriction part is provided at an upstream end
portion of a drain channel body part. In this drain socket, flush
water from the drain pipe part of the toilet bowl is caused to
collide with the restriction part to increase siphon force.
SUMMARY OF THE DISCLOSURE
[0004] In the above-described configuration, paper or the like
flowing down together with the flush water easily gathers at a back
portion of the restriction part. When paper or the like having
gathered at the back portion of the restriction part is caught
there, clogging may occur. Therefore, improvement has been
desired.
[0005] The present disclosure has been completed based on the
above-described circumstances, and an object thereof is to provide
a drain socket in which paper or the like can be less likely to be
caught at a restriction part.
[0006] A drain socket of the present disclosure includes: a first
connection part connected to a drain pipe part of a toilet bowl; a
second connection part connected to drain piping in a floor or the
like; and a drain channel body part connecting the first connection
part and the second connection part. The drain channel body part
includes an inclined part inclined to one side in a front-back
direction toward a lower side. A restriction part is provided at an
upstream end portion of the drain channel body part. A surface of
the restriction part located on the one side has a portion where a
horizontal distance between a center of the first connection part
and a side edge surface of the restriction part increases from a
center of the surface in a left-right direction toward an end side
of the surface in the left-right direction.
[0007] A drain socket-equipped toilet bowl according to the present
disclosure includes a toilet bowl having a drain pipe part of the
toilet bowl; and the above-described drain socket.
[0008] The one side in the front-back direction in the present
disclosure is a direction on a horizontal plane when the
inclination direction of the inclined part is projected on the
horizontal plane. The left-right direction in the present
disclosure is a direction crossing the front-back direction in the
present disclosure. The up-down direction in the present disclosure
is an up-down direction in a state in which the drain socket is
installed (a state in which the second connection part is connected
to the drain piping in a floor or the like).
BRIEF DESCRIPTION OF THE FIGURES
[0009] FIG. 1 is a cross-sectional view showing a drain socket, in
which the drain socket connects a drain pipe part of a toilet bowl
and drain piping in a floor, according to some embodiments;
[0010] FIG. 2 is a sectional view showing the drain socket,
according to some embodiments;
[0011] FIG. 3 is a plan view showing an upper member of a hanging
pipe of the drain socket, according to some embodiments;
[0012] FIG. 4 is a diagram illustrating the flow of water in the
drain socket, according to some embodiments;
[0013] FIG. 5 is a cross-sectional view showing a drain socket
according to some embodiments; and
[0014] FIG. 6 is a partially enlarged plan view showing the drain
socket, according to some embodiments.
DETAILED DESCRIPTION OF THE DISCLOSURE
[0015] In the drain socket of the present disclosure, a surface of
the inclined part on a side opposite to the one side may have a
gradient closer to vertical on the downstream side than on the
upstream side. According to such a configuration, flush water that
has collided with a portion of the restriction part located on the
one side and rebounded on the surface of the inclined part on the
side opposite to the one side is drained vigorously due to the
gradient close to vertical of the downstream side of the surface on
the side opposite to the one side of the inclined part. Therefore,
paper or the like can be less likely to be caught at the drain
channel body part.
[0016] In the drain socket of the present disclosure, an inclined
surface may be provided on a downstream side of the surface of the
restriction part on the one side, the inclined surface being
inclined to the side opposite to the one side toward a lower side
in a vertical direction. According to such a configuration, flush
water that has collided with the portion of the restriction part
located on the one side flows down along the inclined surface to
the surface of the inclined part on the side opposite to the one
side, and flows down vigorously along the surface of the inclined
part on the side opposite to the one side. Thus, the siphon force
can be increased.
[0017] In the drain socket of the present disclosure, the portion
of the restriction part located on the one side may have a step
surface extending in a direction crossing the vertical direction.
According to such a configuration, a large amount of flush water
can collide with the portion of the restriction part located on the
one side so that water film can be reliably formed. Thus, a siphon
can be reliably generated.
[0018] In the drain socket of the present disclosure, in a state in
which the first connection part is connected to the drain pipe part
of the toilet bowl, the portion of the restriction part located on
the one side is located on the one side relative to a portion,
located on the one side, of the drain pipe part of the toilet bowl.
In other words, at the one side of the toilet bowel, an outer edge
of the drain pipe is located inside an inner edge of the
restriction portion with respect to a horizontal configuration of
the drain pipe and the restriction portion. According to such a
configuration, as compared with the case where the portion of the
restriction part located on the one side is located on the side
opposite to the one side relative to the portion, located on the
one side, of the drain pipe part of the toilet bowl, the flush
water that has collided with the portion of the restriction part
located on the one side goes to a lower position of the surface of
the inclined part on the side opposite to the one side.
Accordingly, the flush water that has collided with the portion of
the restriction part located on the one side and the flush water
that flows down from the drain pipe part of the toilet bowl join
together at the lower position of the inclined part. As a result, a
water film formation position where siphon occurs is lowered, so
that the siphon force can be increased.
[0019] Below, some embodiments are described with reference to
FIGS. 1 to 4.
[0020] In some embodiments a shown for example in FIGS. 1-4, a
drain socket 10 includes a first connection part 11 connected to a
drain pipe part (referred to as a toilet bowl drain pipe part 40)
of a toilet bowl 41, a second connection part 12 connected to drain
piping 50 in a floor, and a drain channel body part (drain channel
body) 13 connecting the first connection part 11 and the second
connection part 12.
[0021] In the following description of each component, the left
side in FIG. 1 (an inclination direction of an inclined part 14) is
back, the right side in FIG. 1 is front, the upper side in FIG. 1
is upper, and the lower side in FIG. 1 is lower, based on the
orientation of a person sitting on the toilet bowl 41 in a normal
posture. Further, in a direction perpendicular to the paper surface
in FIG. 1, the front side of the paper surface is right, and the
back side of the paper surface is left.
[0022] The toilet bowl 41 has a bowl part 42 and a toilet bowl
drain channel 43 extending from a bottom part of the bowl part 42
toward the back side of the toilet bowl 41. The toilet bowl drain
channel 43 extends obliquely upward from the bottom part of the
bowl part 42, then extends downward, and opens vertically downward
at its downstream end. The downstream end of the toilet bowl drain
channel 43 is formed in the toilet bowl drain pipe part 40. The
toilet bowl drain pipe part 40 has a cylindrical shape, and
protrudes vertically downward at a back end portion of the toilet
bowl 41.
[0023] The drain socket 10 has a hanging pipe 15 having the first
connection part 11, an adjuster pipe 16 extending substantially
horizontally from a lower end portion of the hanging pipe 15, and a
connecting pipe 17 connected to a distal end portion of the
adjuster pipe 16. The connecting pipe 17 has the second connection
part 12. In the drain socket 10, the horizontal distance between
the first connection part 11 and the second connection part 12 can
be changed by cutting the adjuster pipe 16 to a predetermined
length.
[0024] A lower end portion of the hanging pipe 15 is provided with
a bent part 18. The bent part 18 is bent in an arc shape. Water
accumulates in the bent part 18 so that a siphon action occurs.
[0025] The hanging pipe 15 is divided into an upper member 15U and
a lower member 15S. A lower end of the upper member 15U is inserted
into an upper end of the lower member 15S and joined by an
adhesive. The adjuster pipe 16 is formed integrally with the lower
member 15S. The bent part 18 is formed in the lower member 15S.
[0026] The first connection part 11 has a cylindrical shape and is
opened to both upper and lower sides. The toilet bowl drain pipe
part 40 is inserted into the first connection part 11 from above. A
packing 60 is mounted on an outer peripheral surface of the first
connection part 11.
[0027] As shown in FIG. 2, the packing 60 has a packing body part
61 externally fitted to the first connection part 11, and a seal
part 62 protruding inward from an upper end of the packing body
part 61. The seal part 62 has an annular shape and is in close
contact with the entire circumference of the toilet bowl drain pipe
part 40 (see FIG. 1).
[0028] The second connection part 12 has a cylindrical shape and is
opened in the vertical direction. The second connection part 12 is
continuous with a downstream end of the drain channel body part 13.
The second connection part 12 is inserted into the drain piping
50.
[0029] The drain channel body part 13 extends over the hanging pipe
15, the adjuster pipe 16, and the connecting pipe 17. The drain
channel body part 13 includes the inclined part 14, the bent part
18 continuous with the downstream side of the inclined part 14, a
horizontal part 19 continuous with the downstream side of the bent
part 18, and a vertical part 21 continuous with the downstream side
of the horizontal part 19. The flow channel area of the drain
channel body part 13 is substantially constant over the inclined
part 14, the bent part 18, the horizontal part 19, and the vertical
part 21. That is, the inner diameter dimension is substantially
constant over the inclined part 14 and bent part 18 of the hanging
pipe 15, the adjuster pipe 16, and the connecting pipe 17.
[0030] The inclined part 14 is formed in the upper member 15U of
the hanging pipe 15. The inclined part 14 is inclined with respect
to the vertical direction. The inclined part 14 is inclined
backward toward the downstream side, as shown in FIG. 2. The
inclined part 14 is displaced backward little by little from the
upper end toward the lower end.
[0031] As shown in FIG. 2, a front surface (a surface on the side
opposite to the one side) 22 of the inclined part 14 is located on
a side facing a restriction part back portion 31. The front surface
22 of the inclined part 14 has a gradient closer to vertical on the
downstream side 22S than on the upstream side 22U. In other words,
the front surface 22 is more inclined from the vertical direction
on an upstream 22U side than on a downstream side 22S. As shown in
FIG. 2, the cross-sectional shape of the front surface 22 of the
inclined part 14 is curved in an arcuate shape bulging backward.
When viewed from above in the vertical direction, a lower end of
the downstream side 22S of the front surface 22 is linear in the
left-right direction as shown in FIG. 3.
[0032] A restriction part 30 is provided at an upstream end portion
of the drain channel body part 13. The restriction part 30 has
first and second step surfaces 33 and 34 each of which extends in a
direction crossing the vertical direction (substantially in a
horizontal direction). The second step surface 34 is located on the
downstream side of the first step surface 33. The width dimension
(dimension in the inner-outer direction) of the second step surface
34 is smaller than that of the first step surface 33, as shown in
FIG. 3.
[0033] As shown in FIG. 3, the first step surface 33 has an annular
shape formed on the entire circumference of the restriction part
30. The first step surface 33 has first side step surfaces 33S
located on both left and right sides of the restriction part 30, a
first front step surface 33F located on the front side of the
restriction part 30, and a first back step surface 33R located on
the back side of the restriction part 30. The width dimension
(dimension in the inner-outer direction) of the first back step
surface 33R gradually decreases from the center of the first back
step surface 33R in the left-right direction toward the end sides
of the first back step surface 33R in the left-right direction.
[0034] As shown in FIG. 3, the second step surface 34 has second
side step surfaces 34S located on both left and right sides of the
restriction part 30, and a second back step surface 34R located on
the back side of the restriction part 30. The second side step
surfaces 34S and the second back step surface 34R have
substantially the same width dimension (dimension in the
inner-outer direction).
[0035] As shown in FIG. 3, a peripheral surface of the restriction
part 30 has a pair of left and right side surfaces 35, a front
surface (a front side edge surface) 36, and a back surface (a back
side edge surface) 37. The front surface 36 connects the front end
sides of the pair of left and right side surfaces 35. The back
surface 37 connects the back end sides of the pair of left and
right side surfaces 35. The back surface 37 of the restriction part
30 is a surface of the restriction part 30 located on the one side
where the inclined part 14 is inclined.
[0036] The pair of side surfaces 35 hangs down substantially
vertically from inner edges of the pair of first side step surfaces
33S. As shown in FIG. 3, the pair of side surfaces 35 are
substantially parallel and extend linearly in the front-back
direction, in plan view from above. The front surface 36 hangs down
substantially vertically from an inner edge of the first front step
surface 33F. The front surface 36 is curved in an arc shape
centered on the center C of the first connection part 11 in plan
view from above. The back surface 37 hangs down substantially
vertically from an inner edge of the first back step surface 33R.
The back surface 37 will be described later in detail.
[0037] As shown in FIG. 3, a portion of the restriction part 30
located on the one side (referred to as a restriction part back
portion 31) has the first back step surface 33R, the second back
step surface 34R, and the back surface 37. The back surface 37
forms a peripheral surface of the restriction part back portion 31.
As shown in FIG. 3, the back surface 37 is curved in an arc shape
having a radius larger than that of the front surface 36 in plan
view from above. In the back surface 37, a horizontal distance B1
between left and right ends 37L and 37R and the center C of the
first connection part 11 is larger than a distance B2 between the
center of the back surface 37 in the left-right direction and the
center C of the first connection part 11. A horizontal distance
between the restriction part back portion 31 and the center C of
the first connection part 11 gradually increases from the center of
the restriction part back portion 31 in the left-right direction
toward both ends 37R and 37L. The restriction part 30 is symmetric
left and right with respect to the center C of the first connection
part 11.
[0038] As shown in FIG. 2, an inclined surface 38 that is inclined
frontward toward the lower side in the vertical direction is
provided on the downstream side of the restriction part back
portion 31. The inclined surface 38 hangs down from an inner edge
of the second back step surface 34R (see FIG. 3). The inclined
surface 38 extends from the inner edge of the second back step
surface 34R to an upstream end of the inclined part 14 of the drain
channel main body 13. The inclined surface 38 is inclined toward
the downstream side 22S of the front surface 22 of the inclined
part 14. In other words, as shown in FIG. 2, a virtual inclined
surface 39 extending downward along the inclined surface 38 crosses
the downstream side 22S of the front surface 22 of the inclined
part 14. The inclined surface 38 is inclined more than the front
surface 36 of the restriction part 30 which faces the inclined
surface 38.
[0039] The inclined surface 38 is curved in an arc shape
substantially parallel to the back surface 37, as shown in FIG. 3.
That is, a horizontal distance between both ends of the inclined
surface 38 in the left-right direction and the center C of the
first connection part 11 is larger than that between the center of
the inclined surface 38 in the left-right direction and the center
C of the first connection part 11.
[0040] Below, some examples of use of the drain socket 10 according
to some embodiments are described.
[0041] First, as shown in FIG. 1, the toilet bowl drain pipe part
40 and the drain piping 50 are connected using the drain socket 10.
The second connection part 12 of the drain socket 10 is connected
to the drain piping 50, and the toilet bowl drain pipe part 40 is
inserted into the first connection part 11. A lower end of the
toilet bowl drain pipe part 40 protrudes downward relative to the
lower end of the seal part 62 of the packing 60.
[0042] In a state in which the first connection part 11 is
connected to the toilet bowl drain pipe part 40, the restriction
part back portion 31 is located behind a back portion (a portion
located on the one side) 44 of the toilet bowl drain pipe part 40,
as shown in FIG. 1. In other words, a horizontal distance between
the restriction part back portion 31 and the front surface 22 of
the inclined part 14 is larger than that between the back portion
44 of the toilet bowl drain pipe part 40 and the front surface 22
of the inclined part 14.
[0043] As shown in FIG. 4, the water discharged from the toilet
bowl drain pipe part 40 collides with the restriction part back
portion 31, and forms a water film W1 on the downstream side, so
that a siphon occurs early. The water that has collided with the
restriction part back portion 31 flows down by the inclined surface
38 to the downstream side 22S, as indicated by arrow X. The flush
water that has flowed down from the restriction part back portion
31 joins the flush water that has flowed down from the toilet bowl
drain pipe part 40 as shown by arrow Y in the downstream side 22S,
so that a water film W2 is formed. Since the water film forming
position is thus low, a strong siphon force is generated. The water
that has flowed down to the downstream side 22S vigorously flows
into the bent part 18 as indicated by arrow Z along a nearly
vertical inclination of the downstream side 22S. Thus, the water is
strongly pulled downward, so that the siphon force becomes
stronger.
[0044] In addition, paper or the like flowing down with the water
gathers at the restriction part back portion 31. Here, since the
restriction part back portion 31 expands in the left-right
direction more largely than in the case where the restriction part
back portion 31 has an arcuate surface, paper or the like is less
likely to concentrate at the center. Further, since the flow
channel area in the restriction part 30 is larger than that in the
case where the restriction part back portion 31 has an arcuate
surface, paper or the like flows down without being caught. Paper
or the like is drawn down vigorously with water by the strong
siphon force, and discharged smoothly.
[0045] Next, the operation and effects of some embodiments
configured as described above will be described.
[0046] The drain socket 10, in some embodiments, includes the first
connection part 11 connected to the drain pipe part (drain pipe) of
the toilet bowl 41, the second connection part 12 connected to the
drain piping 50 in the floor, and the drain channel body part
(drain channel body) 13 connecting the first connection part 11 and
second connection part 12. The drain channel body part 13 includes
the inclined part 14 inclined backward toward the downstream side.
A restriction part 30 is provided at an upstream end portion of the
drain channel body part 13. The back surface (back edge surface) 37
of the restriction part 30 has a shape such that the horizontal
distance B1 between both ends 37L and 37R in the left-right
direction and the center C of the first connection part 11 is
larger than the horizontal distance B2 between the center of the
back surface 37 in the left-right direction and the center C of the
first connection part 11. According to this configuration, in the
back surface 37 of the restriction part 30, both end portions
thereof in the left-right direction are located on more outer sides
as compared with the case where the back surface 37 has an arc
shape having a constant horizontal distance from the center C of
the first connection part 11. Therefore, paper or the like is less
likely to concentrate at the center of the back surface 37 of the
restriction part 30, and easily flows down since the flow channel
area is large. Thus, the paper or the like can be less likely to be
caught at the restriction part back portion 31.
[0047] The front surface 22 of the inclined part 14 has a gradient
closer to vertical on the downstream side than on the upstream
side. According to this configuration, the flush water that has
flowed down from the restriction part back portion 31 to the front
surface 22 of the inclined part 14 is drained vigorously due to the
gradient close to vertical of the downstream side of the front
surface 22. Therefore, paper or the like can be less likely to be
caught at the drain channel body part 13.
[0048] The inclined surface 38 that is inclined frontward toward
the lower side in the vertical direction is provided on the
downstream side of the back surface 37 of the restriction part 30.
According to this configuration, the flush water that has collided
with the restriction part back portion 31 flows down along the
inclined surface 38 to the front surface 22 of the inclined part
14, and flows down vigorously along the front surface 22. Thus, the
siphon force can be increased.
[0049] The restriction part back portion 31 has the first and
second step surfaces 33 and 34 each of which extends in a direction
crossing the vertical direction. According to this configuration, a
large amount of flush water collides with the restriction part back
portion 31, and thus the siphon force can be increased.
[0050] In a state in which the first connection part 11 is
connected to the toilet bowl drain pipe part 40, the restriction
part back portion 31 is located behind the back portion 44 of the
toilet bowl drain pipe part 40. According to this configuration, as
compared with the case where the restriction part back portion 31
is located ahead of the back portion 44 of the toilet bowl drain
pipe part 40, the flush water that has rebounded from the
restriction part back portion 31 goes to a lower position of the
inclined part 14. Accordingly, the flush water that has collided
with and rebounded from the restriction part back portion 31 and
the flush water that flows down from the toilet bowl drain pipe
part 40 join together at the lower position of the inclined part
14. As a result, a water film formation position where siphon
occurs is lowered, so that the siphon force can be increased.
[0051] Below, a drain socket 70 according to some embodiments is
described with reference to FIGS. 5 and 6.
[0052] The drain socket 70 may be different from one or more other
drain socket embodiments described herein in that drain socket 70
may, in some embodiments, not include an adjuster part. Same or
similar components as those in drain socket 10 are denoted by the
same reference numerals, and redundant descriptions thereof are
omitted.
[0053] The drain socket 70 may include, in a same or similar manner
as described above with respect to drain socket 10, the first
connection part 11, the second connection part 12, and/or the drain
channel body part 13. In a same or similar manner as described
above with respect to drain socket 10, the drain channel body part
13 has the inclined part 14, and the restriction part 30 is
provided at the upstream end portion of the drain channel body part
13. In the following description of each component, the direction
in which the inclined part 14 is inclined toward the lower side
(left side in FIG. 5) is back, the opposite direction (right side
in FIG. 5) is front, the upper side in FIG. 5 is upper, and the
lower side in FIG. 5 is lower. Further, in a direction
perpendicular to the paper surface in FIG. 5, the front side of the
paper surface is right, and the back side of the paper surface is
left.
[0054] In the drain channel main body part 13, the vertical part 21
is continuous with the downstream side of the inclined part 14. In
a same or similar manner as described above with respect to drain
socket 10, the front surface 22 of the inclined part 14 has a
gradient closer to vertical on the downstream side 22S than on the
upstream side 22U.
[0055] In a same or similar manner as described above with respect
to drain socket 10, the restriction part 30 has the first and
second step surfaces 33 and 34 each of which extends in a direction
crossing the vertical direction (substantially in a horizontal
direction).
[0056] In a same or similar manner as described above with respect
to drain socket 10, the first step surface 33 has an annular shape
formed on the entire circumference of the restriction part 30, and
has the first side step surfaces 33S, the first front step surface
33F, and the first back step surface 33R. The first front step
surfaces 33F and the first back step surface 33R have substantially
the same width dimension (dimension in the inner-outer
direction).
[0057] The second step surface 34 has the second side step surfaces
34S located on both left and right sides of the restriction part
30, and the second front step surface 71 located on the front side
of the restriction part 30. The second side step surfaces 34S and
the second front step surface 71 have substantially the same width
dimension (dimension in the inner-outer direction).
[0058] The peripheral surface of the restriction part 30 has the
pair of left and right side surfaces 35, the front surface 36, and
the back surface 37, in a same or similar manner as described above
with respect to drain socket 10.
[0059] The restriction part back portion 31 has the first back step
surface 33R and the back surface 37. In a same or similar manner as
described above with respect to drain socket 10, the back surface
37 is in some embodiments curved in an arc shape having a radius
larger than that of the front surface 36 in plan view from
above.
[0060] In a same or similar manner as described above with respect
to drain socket 10, the inclined surface 38 that is inclined
frontward toward the lower side in the vertical direction is in
some embodiments provided on the downstream side of the restriction
part back portion 31. The inclined surface 38 hangs down from the
lower end of the back surface 37. In a same or similar manner as
described above with respect to drain socket 10, the inclined
surface 38 is in some embodiments inclined toward the downstream
side 22S of the front surface 22 of the inclined part 14.
[0061] In a same or similar manner as described above with respect
to drain socket 10, the inclined surface 38 in some embodiments has
a shape such that a horizontal distance between both ends of the
inclined surface 38 in the left-right direction and the center C of
the first connection part 11 is larger than that between the center
of the inclined surface 38 in the left-right direction and the
center C of the first connection part 11. The inclined surface 38
is curved in an arc shape that is gentler than that of the back
surface 37 in plan view from above. That is, the inclined surface
38 has a radius larger than that of the back surface 37.
[0062] As described above, in some embodiments, both end portions
of the restriction part back portion 31 in the left-right direction
are located on more outer sides, so that paper or the like is less
likely to concentrate at the center of the restriction part back
portion 31, in a same of similar manner as described with reference
to drain socket 10, and paper or the like easily flows down since
the flow channel area is large. Thus, the paper or the like can be
less likely to be caught at the back portion of the restriction
part 30.
[0063] In a same or similar manner as described above with respect
to drain socket 10, the inclined surface 38 that is inclined
frontward toward the lower side in the vertical direction is in
some embodiments provided on the downstream side of the restriction
part back portion 31. According to this configuration, the flush
water that has abutted against the restriction part back portion 31
flows down along the inclined surface 38 to the front surface 22 of
the inclined part 14, and flows down vigorously along the front
surface 22. Thus, the siphon force can be increased.
[0064] The restriction part back portion 31 has the first step
surface 33 extending in a direction crossing the vertical
direction. According to this configuration, a large amount of flush
water collides with the restriction part back portion 31, and thus
the siphon force can be increased.
[0065] The present disclosure is not limited to the embodiments
described by the above description and drawings, and the following
embodiments are also included in the technical scope of the present
disclosure.
[0066] Some descriptions herein have described the cases where the
present disclosure is applied to the drain sockets 10 and 70 each
of which is connected to the drain piping 50 provided in the floor.
However, the present disclosure can also be applied to a drain
socket for wall drain, which is connected to drain piping provided
in a wall standing substantially perpendicular to the floor.
[0067] In some embodiments, the restriction part 30 has the first
and second step surfaces 33 and 34, but the present disclosure is
not limited thereto. The restriction part may have a tapered
surface, instead of the step surfaces, in which the flow channel
area is reduced toward the downstream side. Further, the
restriction part may have three or more step surfaces.
[0068] In some embodiments, the front surface 22 of the inclined
part 14 has a gradient closer to vertical on the downstream side
than on the upstream side. However, the gradient of the front
surface of the inclined part does not necessarily have to be
designed in this manner.
[0069] In some embodiments, the inclined surface 38 is provided on
the downstream side of the restriction part back portion 31, but
the inclined surface does not necessarily have to be provided.
[0070] In some embodiments, the pair of side surfaces 35 is
substantially parallel, and extends linearly in the front-back
direction, but the present disclosure is not limited thereto. The
pair of side surfaces may be, for example, gently curved.
[0071] In some embodiments, the back surface 37 has an arc shape,
but the present disclosure is not limited thereto. The back surface
has only to have a portion where a horizontal distance from the
center of the first connection part increases from the center of
the back surface in the left-right direction toward the end sides
of the back surface. That is, such a portion may be formed in at
least a part of the back surface.
[0072] In some embodiments described herein, the inclined part 14
of the drain socket 10 (or 70) may be inclined backward of the
toilet bowl 41 toward the lower side, but the present disclosure is
not limited thereto. The inclined part of the drain socket may be
inclined in any direction in the horizontal direction toward the
lower side. For example, the inclined part of the drain socket may
be inclined frontward, leftward or rightward of the toilet bowl
toward the lower side.
[0073] In some embodiments, the inclined part 14 is inclined
backward toward the downstream side, but, the present disclosure is
not limited thereto. The inclined part 14 may be inclined frontward
toward the downstream side.
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