JP2020063572A - Member having flange part of water trap and mold structure of the member - Google Patents

Abstract

To provide a member having a flange part of a water trap preventing loss of water-tightness and air-tightness due to minute irregularities like parting lines on a surface having irregularities of male screw parts of the flange part, in the member having the flange part of the water trap.SOLUTION: A member having a flange part of a water trap is composed of a cylindrical body part, the flange part provided along the circumference of a side face of the body part, and an irregularity part provided on the side face of the body part, and a surface of the irregularity part side of the flange part is smoothly formed. In order to achieve the above structure, molds molding the member having the flange part are composed of first mold parts molding the irregularity part of the body part, divided after molding and moved in the side direction of the body part, and second mold parts molding the smooth surface on the irregularity part side of the flange part and moved in the axial direction of the body part after movement of the first mold parts.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a drainage device for treating drainage of a drainage device such as a washbasin, a sink, a bathtub, a bathroom, etc., and relates to a flanged member used when the drainage device is attached to the drainage device, and more specifically, The present invention relates to the structure of a member with a flange portion that has improved water tightness during construction, and a mold for molding the member with a flange portion.

  2. Description of the Related Art Devices such as washbasins, sinks, bathtubs and bathrooms that generate wastewater by use have been known. In these drainage devices, in order to treat the generated wastewater, a pipe structure is known in which a drainer is attached to the drainage device and a pipe is connected from the drainer to the sewage side to treat the drainage to the sewage side.

The conventional drainer described in Patent Document 1 is a drainer called a drain trap that is attached to a waterproof pan for a washing machine on which a washing machine, which is a drainage device, is mounted, and has an opening on the upper side and an outlet on the side surface. A trap body provided with each of them, a flange member having a cylindrical body portion and a flange portion projecting in an outer peripheral direction at an upper end of an outer surface of the body portion, and a non-return member attached to the flange member and arranged in the trap body. It is composed of a water sealing member having a valve and an annular packing for stopping water. A female screw portion is provided inside the opening of the trap body, and a male screw portion is provided on the side surface of the main body portion of the flange member.
The above-mentioned waterproof pan for a washing machine to which the drain trap is attached has a substantially square shape, and includes a bottom portion having mounting holes for attaching the drain trap, and legs of the washing machine provided at four corners of the bottom portion. It is composed of a pedestal part to be placed and a wall surface part provided so as to surround the bottom part and the periphery of the pedestal part.

The drain trap and the waterproof pan for a washing machine described above are constructed as follows.
The floor on which the waterproof pan for a washing machine is constructed has an opening connected to the underfloor space, and the underfloor space is provided with underfloor piping connected to the sewer-side piping.
First, the end of the underfloor pipe is connected to the outlet of the trap body, and the trap body is placed in the underfloor space.
Next, the ring packing of the drain trap is attached to the periphery of the attachment hole of the waterproof pan for the washing machine.
Next, after inserting the body portion of the flange member into the mounting hole of the waterproof pan for a washing machine, the flange member is rotated to screw the female screw portion of the trap body into the male screw portion of the flange member. When the screwing is sufficiently advanced, the lower surface of the flange portion of the flange member and the upper edge of the opening of the trap body hold the peripheral edge of the mounting hole of the waterproof pan for a washing machine through the annular packing. In this way, the drain trap is attached and fixed to the waterproof pan for the washing machine.
Next, the waterproof pan for the washing machine is placed on the floor.
Next, the water sealing member is attached to the trap body, and then the washing machine is placed on the pedestal portion of the waterproof pan for the washing machine.
Further, the drainage hose pipe of the washing machine is connected to the sealing member of the drainage trap, and the construction of the washing machine, the washing machine waterproof pan, and the drainage trap is completed.
As described above, the flange member having the flange portion is a member used for connecting and fixing the trap body to the mounting hole.
In the washing machine, waterproof pan for washing machine, and drain trap constructed in this way, if drainage occurs due to the use of the washing machine, drainage from the washing machine will come from the drain hose pipe to the sealing member, and inside the trap body. And is discharged from the discharge port to the sewage side through the underfloor piping.
Also, when drainage occurs on the floor surface of the waterproof pan for washing machines due to damage to the hose pipe, the drainage passes from above the floor surface to the main body of the flange member and inside the trap body, and from the outlet to below the floor. It is discharged to the sewage side through piping.

In mounting the drain trap on the washing machine waterproof pan, watertight mounting is performed as follows.
At the time of construction, the lower surface of the flange portion of the flange member and the upper edge of the opening of the trap body hold the peripheral edge of the mounting hole of the waterproof pan for a washing machine through the annular packing. From this state, when the internal thread of the trap body and the external thread of the flange member are sufficiently screwed together, the lower surface of the flange of the flange member and the upper surface of the annular packing, or the upper edge of the opening of the trap body and the lower surface of the annular packing. And are strongly pressed and fixed by the stress due to screwing. By such attachment, a ring-shaped contact surface is formed along the annular packing, and the drainage flow is blocked between the inside and the outside of the ring-shaped contact surface. By doing so, drainage on the washing machine waterproof pan is prevented from passing through the surface of the flange portion on the male screw portion side and reaching the main body portion. It also prevents the drainage in the drain trap from passing between the male and female threads and between the waterproof pan for the washing machine and the upper edge of the trap body to leak into the underfloor space. To be done.

By the way, the annular packing is made of a material having a relatively high coefficient of friction such as a rubber material, and when abutting is caused by a strong stress, the annular packing operates so as to adhere to the abutting member due to friction.
Therefore, when attaching the drain trap to the waterproof pan for a washing machine as in the invention of Patent Document 1 described above, both the flange member that rotates when screwed and the trap body that does not rotate and the waterproof pan for a washing machine The annular packing that abuts against is rotated together with the rotating flange member, and is not rotated or moved from the place together with the trap body that does not rotate and the waterproof pan for the washing machine. As a result, the annular packing may be twisted or partially expanded / contracted during screwing for construction of the drainage trap, making it difficult to maintain watertightness.
In order to prevent this, the invention described in Patent Document 2 employs a member indicated by reference numeral 16 called a slip packing. The slip packing is a ring-shaped member having a flat and uniform thickness, which is less flexible and elastic than a rubber material, but is made of a material having a low friction coefficient. If this sliding packing is placed between the ring packing and the rotating member due to screwing, even if the rotating member comes into contact with a strong stress enough to complete the screwing, it will stick to the contact surface of the rotating member. Since the sliding does not occur, the above-mentioned twist of the annular packing does not occur.
Incidentally, among the contact surfaces of the sliding packing, the contact surface with the annular packing comes into contact with the annular packing in a watertight manner by the elasticity of the annular packing, so that no water leakage occurs. Further, in the portion that comes into contact with the rear surface of the flange portion, both the rear surface of the flange portion and the slip packing are substantially flat surfaces, and the flat surfaces strongly press each other, so that water leakage does not occur even if elasticity is not provided.

JP, 2017-203266, A JP-A-7-216949

In the case of watertightly connecting the contact portion between the annular packing and the member having the flange portion, the watertight connection is achieved by bringing the annular packing or the sliding packing into contact with the flat surface of the flange portion. I do. If the abutting part of the flange part has fine irregularities, the annular packing or the sliding packing will be deformed by the irregular part in the state of contacting the annular packing or the sliding packing, and a gap will be created around the irregular part. There is a possibility of water leakage from this gap. In particular, the slip packing is made of a hard material as compared with an annular packing made of a rubber material, and is less likely to be deformed than an annular packing having elasticity, so that a gap is likely to be formed due to a step or unevenness. For this reason, it is necessary that the abutting portion of the flange member with the annular packing or the sliding packing, that is, the surface of the flange portion on the male screw portion side is as uneven as possible.
By the way, the flange member is usually manufactured by resin molding. Specifically, a resin material melted at high temperature is press-fitted into a metal mold that has been tightened by applying stress with an injection molding machine, and after the resin has cooled and solidified, the mold is split. This is a method of taking out a flange member which is a resin molded product inside.
Here, when the center axis of the main body portion of the flange portion is arranged vertically, the outer portion of the flange member is formed by two dies that are divided in the left-right direction (outer peripheral direction of the main body portion). . This is because Patent Document 1. The external thread of the flange member, such as a male screw part, is provided on the outer surface of the main body of the flange member to move along the central axis of the main body of the flange member. This is because, if an attempt is made to mold the entire outer portion of the flange member with this mold, this uneven portion becomes a so-called undercut, and it becomes impossible to remove the molded product from the mold.
However, if the outer portion of the flange member is formed by a mold that is divided into right and left in this way, the parting line from the main body portion to the outer peripheral edge of the flange portion can be formed on the male screw portion side surface of the flange portion. A linear step or ridge called a line is generated.
To be more specific, the parting line means a step due to a minute misalignment of the mold seams or a seam of the molds at the seam between the molds when the resin is injected into the molds. It is a ridge that originates from a minute gap.
The conventional flange member shown in FIG. 10 is molded by a mold having two parts, that is, a first mold and a third mold shown in FIG. In the following description, there is a missing number in the mold and parting line numbers, because the mold and parting line numbers in the examples to be described later are prioritized and matched with the numbers in the conventional example. It is due to the fact.
The first mold K1 is a mold for molding substantially the entire outer surface of the flange member from the lower end of the main body portion of the flange member to the upper end of the side surface of the flange portion including the male screw portion. It is composed of two molds that are divided into left and right in a plane passing through, and moves to both left and right sides of the main body after the flange member is molded. Further, an injection portion for injecting the melted resin is provided at a position which becomes the lower end of the main body of the first mold.
The third mold K3 is a main body of the flange member, and is a mold for molding the upper surface of the flange part and the inner part of the main body. After the molding of the flange member, the third mold K3 exits above the flange member. To move.
A conventional flange member is molded from such a mold through the following steps.
First, as shown in FIG. 11 (a), the first mold K1 and the third mold K3 are combined, and then the molten resin material is press-fitted from the lower end of the main body of the flange member. , The injected resin material is cooled and solidified.
Next, the first die K1 is divided along a plane passing through the central axis of the main body, and is divided into left and right parts.
Next, by moving the third mold K3 upward in the direction along the central axis of the main body part and removing it from the main body part, as shown in FIG. Is removed and the molding of the flange member is completed. Note that "to remove the third mold K3 upward from the main body" is a relative operation, and in practice, the third mold K3 is fixed and the flange member including the main body is removed. It also includes the case of moving it downward and pulling it out. In the following description of the operation of the mold, similarly, when relative operation is possible, that operation is also included.
The flange member molded in this way produces a fourth parting line from the following second parting line.
Second parting line PL2: An annular parting line at the inner diameter of the lower end of the main body of the flange member, which is formed at the joint between the first mold and the third mold.
Third parting line PL3: An annular parting line at the upper end outer edge portion of the flange portion of the flange member, which is generated at the joint between the first mold and the third mold.
Fourth parting line PL4: formed along the surface passing through the central axis between the second parting line PL2 and the third parting line PL3 generated at the joint between the first molds Two straight parting lines are used.
As described above, the conventional flange member has a configuration in which the fourth parting line PL4 is generated on the surface (lower surface) of the flange member on the male screw portion side that is the uneven portion.
The steps and ridges caused by the parting line are originally "a fine structure that is formed so that it does not occur, but it will inevitably occur due to technical problems", that it is an unintended structure, and a fine structure. Therefore, it is almost ignored from various technical data including patent documents. However, the step or ridge of the parting line that extends from the main body to the outer edge of the flange that occurs on the surface of the flange that contacts the annular packing, the parting line has a step when the drainer is actually installed. As shown in FIG. 12, in the case of convex ridges, as shown in FIG. 13, a gap S is generated from the outer edge of the flange portion of the flange member to the main body portion at the portion contacting the annular packing or the sliding packing. There is a problem that water leakage occurs through the gap S.

In addition, in an apartment or the like, the underfloor pipes on each floor are almost always connected to vertical pipes that vertically penetrate the entire building composed of higher floors. In this case, if there is drainage from the upper floors, the air that was below the drainage in the vertical piping will be pushed downward by the drainage and concentrate downward, creating a high positive pressure in the piping on the lower floors. To do. At this time, as described above, if there is a gap from the outer edge of the flange portion of the flange member to the main body portion due to the parting line, the air on the underfloor piping side, which has a positive pressure, causes a gap between the male screw portion and the female screw portion. There was a problem that a backflow would be generated on the indoor side through the gaps of the annular packing or the sliding packing by the parting line. Since the underfloor pipe is connected to the sewage side pipe, the air flowing back at this time has odor on the sewage side and is unsanitary air, and the backflow to the indoor side was a problem.
The present invention has been invented in view of the above problems, in the member with a flange portion of the drainage device, on the surface having irregularities such as the male screw portion of the flange portion, due to fine irregularities such as parting line It is intended to provide a member with a flange portion for a drainage device, which prevents loss of watertightness and airtightness.

The present invention according to claim 1 is a member with a flange portion for a drainage device,
Consists of a tubular main body, a flange portion provided along the peripheral edge of the side surface of the main body portion, and an uneven portion provided on the side surface of the main body portion, and the surface of the flange portion on the uneven portion side is smooth. It is a member with a flange part of a drainage device characterized by being formed.
The phrase "the surface of the flange portion on the uneven portion side is made smooth" as used herein means that the parting line generated when a resin molded product is manufactured using a mold such as injection molding is It means that the surface is smooth because it does not exist on the surface.

The present invention according to claim 2 is a member with a flange portion for a drainage device,
It consists of a tubular main body, a flange portion provided along the peripheral edge of the side surface of the main body portion, and an uneven portion provided on the side surface of the main body portion. It is a member with a flange part of a drainer characterized by comprising a smooth region.
In addition, "the annular smooth region is formed on the surface of the flange portion on the concave-convex portion side" means that a parting line generated when a resin molded product is manufactured using a mold such as injection molding is used. It means that the non-existing region exists in an annular shape along the entire circumference on the surface of the flange portion, and if an annular smooth area is formed on the surface of the flange portion, (in FIG. Even if a parting line is formed on the same surface of the same flange portion as in b), it is included in the content of the invention.
On the other hand, as in the conventional flange member shown in FIG. 10B, a linear parting line continuous from the main body portion to the outer diameter of the flange portion is formed on the surface of the flange portion on the male screw side. In the case where the smooth region is divided and has an arcuate shape or a semicircular shape instead of an annular shape, the "annular" smooth area is not configured and does not correspond to the present invention.

The present invention according to claim 3 is the member with the flange portion of the drainage device,
The flange member of the drainage device according to claim 1 or 2, wherein the uneven portion is a male screw portion.

  A fourth aspect of the present invention is the mold structure of the flanged member of the drainage device according to any one of the first to third aspects, wherein the uneven portion of the main body is molded. Mold the first mold part that splits after molding and moves in the side surface direction of the main body part, and the smooth surface on the uneven part side of the flange part, in the axial direction of the main body part after moving the first mold part It is the mold structure of the member with the flange part of the drainage device which consists of the moving 2nd mold part.

According to the first and second aspects of the present invention, in the member with the flange portion of the drainage device, the surface of the flange portion on the uneven portion side is configured to be a smooth surface without a parting line, or the unevenness of the flange portion is formed. By configuring a smooth area without an annular parting line on the part side surface, at the time of completion of construction, in the state where the surface on the uneven part side of the flange part is in contact with the annular packing, the uneven part side of the flange part Between the surface and the annular packing, there is no gap between the inner diameter side and the outer diameter side due to the parting line, and there is no air leakage or water leakage between the main body side of the flange and the outer edge of the flange. Watertight and airtight connections can be made.
According to the third aspect of the present invention, in the flanged member of the drainage device, the configuration of the flange member can be clarified.
In the present invention according to claim 4, a concrete mold structure capable of molding a member with a flange portion of a drainage device in which a parting line is omitted from the surface of the flange portion on the uneven portion side, or on the uneven portion side of the flange portion It is possible to show a specific mold structure capable of molding a member with a flange portion of a drainage device having an annular smooth region without a parting line on its surface.

It is a reference drawing showing the construction state of the first example. It is sectional drawing which shows the construction state of the drain trap and the waterproof pan for washing machines of 1st Example. FIG. 3 is an enlarged view of part A of FIG. 2 with some members omitted. It is sectional drawing which shows the member structure of the drain trap and the waterproof pan for washing machines of 1st Example. It is a reference drawing which shows the member structure of the drain trap and the waterproof pan for washing machines of 1st Example. It is (a) front view (b) bottom view (c) (d) perspective view of the flange member of 1st Example. It is a reference drawing which shows the state which (a) molding state (b) metallic mold of the flange member of 1st Example was opened. It is (a) front view (b) bottom view (c) (d) perspective view of the flange member of 2nd Example. It is a reference drawing which shows the state which (a) molding state (b) metal mold | die of the flange member of 2nd Example. It is (a) front view (b) bottom view (c) (d) perspective view of the flange member of a prior art example. It is a reference drawing which shows the state which (a) molding state (b) metallic mold of the flange member of a prior art example opened. FIG. 11 is an enlarged view of a portion B of FIG. 10 (a) in a state where the construction is completed. FIG. 11 is an enlarged view of a portion B of FIG. 10 (a) in a state where the construction is completed.

A first embodiment of the present invention will be described below with reference to the drawings. The drainer according to the first embodiment of the present invention is a drainer called a drain trap that is attached to a waterproof pan 8 for a washing machine on which a washing machine W, which is a drainage device, is mounted, and the trap body 2 will be described below. , A flange member 1, a water sealing member, an anti-foaming pipe 5, a slip packing 6, and an annular packing 7, which are attached to a waterproof pan 8 for a washing machine described below. In the following description, when the terms “upper and lower” and “side surface direction” are described, the upper and lower sides at the time of completion of construction are taken as a reference.
The trap body 2 is a cylindrical member with a bottom, and has an opening on the upper side and a discharge port 2a on the side surface. Further, the upper opening of the trap body 2 is provided with a plate-shaped portion 2b which projects in the outer peripheral direction along the peripheral edge at the peripheral edge portion thereof, and is provided with a female screw portion 2c on the inner peripheral side of the opening.
The flange member 1 includes a main body portion 1a having a substantially cylindrical shape, a flange portion 1b extending from the upper outer peripheral edge of the main body portion 1a in the outer peripheral direction along the peripheral edge, and the lower peripheral edge of the main body portion 1a. And an inner collar portion 1c protruding in the inner diameter direction. Further, on the outer side surface of the main body portion 1a, in order from above, the flange portion 1b, the round portion 1d provided below the flange portion 1b, which is not provided with irregularities, and the trap body 2 provided below the round portion 1d, are provided. It is provided with a male screw portion 1e as an uneven portion which is screwed with the female screw portion 2c. Here, the outer diameter of the male screw portion 1e is smaller than the outer diameter of the perfect circle portion 1d. Further, in the flange member 1 of the present embodiment, a step or a ridge, which is a so-called parting line, which is generated at the joint of the mold when injection molding is performed by the molding method described later, is the upper end of the side surface of the flange portion 1b. By being formed along the circumference, it is configured as a smooth surface H1 that does not exist on the surface of the flange portion 1b on the male screw portion 1e side, which is the uneven portion.
The water sealing member is composed of the Owan member 3 and the deodorant cylinder 4 described below.
The Owan member 3 is a member having a cylindrical shape with a bottom, and has openings on the side surfaces near the upper side and the upper end, and the upper end is locked to the inner flange portion 1c of the flange member 1.
The deodorant cylinder 4 is a member having a substantially cylindrical shape and an outer flange portion formed along the peripheral edge in the outer surface direction of the upper end, and is watertight with the inner flange portion 1c of the flange member 1 at the outer edge portion of the outer flange portion. In addition, it is configured to be detachably locked. When the construction is completed, the deodorant cylinder 4 is attached above the Owan member 3. The lower end of the deodorant cylinder 4 is disposed inside the Owan member 3, and the upper end is connected to the inner flange portion 1c on the outer peripheral side of the locking position of the Owan member 3.
The foam stop pipe 5 is a pipe arranged in the deodorizing cylinder 4, and a drain hose from the washing machine W is connected to the upstream end thereof.
The slip packing 6 is a member formed by cutting a thin plate-like resin material having a thickness of about 0.5 mm and having a low friction coefficient into a ring shape into a ring shape. It is arranged so as to contact the lower surface of the portion 1b.
The annular packing 7 is an annular member made of a highly elastic material such as rubber and having a U-shaped cross section and a 90 ° tilted shape so that its open portion faces the outer surface. The U-shaped open portion is arranged so as to vertically sandwich the peripheral edge of the mounting hole 8b of the waterproof pan 8 for a washing machine, the upper surface is on the lower surface of the flange portion 1b of the flange member 1 via the slip packing 6, and the lower surface is the trap body. The two plate-shaped portions 2b are arranged so as to be in contact with each other.
The washing machine waterproof pan 8 to which the above-mentioned drain trap is attached has a substantially square shape, and has a bottom surface portion 8a having mounting holes 8b for mounting the drain trap, and a washing machine provided at four corners of the bottom surface portion 8a. It is composed of a pedestal portion 8c on which the W leg portion is placed, and a wall surface portion 8d provided so as to surround the periphery of the bottom surface portion 8a and the pedestal portion 8c.

Here, a method of molding the flange member 1 of this embodiment will be described.
The flange member 1 of this embodiment is molded by a mold including three parts, that is, a first mold K1 to a third mold K3 described below.
The first mold K1 is the main body portion 1a of the flange member 1, and from the lower end of the main body portion 1a to a part of the male screw portion 1e and the round portion 1d, which are concave and convex portions provided on the main body portion 1a. Which is composed of two dies which are divided into right and left in a plane passing through the central axis of the main body 1a, and which move to the left and right sides of the main body 1a after the flange member 1 is molded. . In addition, an injection portion (not shown) for injecting the molten resin is provided at a position that is the lower end of the main body 1a of the first mold K1.
The second mold K2 is a perfect circular part 1d of the main body 1a of the flange member 1, and is a part above the part formed by the first mold K1 and the bottom surface and side surface of the flange part 1b of the flange member 1. Which is formed integrally with the flange member 1, and moves after the flange member 1 so as to slip out below the flange member 1.
The third mold K3 is a mold for molding the main body portion 1a of the flange member 1 and the upper surface of the flange portion 1b and the inner portion of the main body portion 1a. It moves so as to escape above the member 1.

The flange member 1 of this embodiment is molded from the mold described in paragraph 0017 through the following steps.
First, as shown in FIG. 7A, after the first mold K1 to the third mold K3 are combined, the resin material melted from the position of the lower end of the main body 1a of the flange member 1 is removed. The resin material that has been press-fitted and injected is cooled and solidified.
Next, the first die K1 is divided along a plane passing through the central axis of the main body 1a, and divided into left and right parts respectively.
Next, the second mold K2 is moved downward in the direction along the central axis of the main body 1a. As described in paragraph 0016, since the outer diameter of the male screw portion 1e is smaller than the outer diameter of the perfect circle portion 1d, an undercut portion does not occur when the second die K2 is moved downward, The second die K2 can be moved without any trouble.
Finally, by moving the third mold K3 upward in the direction along the central axis of the main body 1a and removing it from the main body 1a, the flange member 1 of the flange member 1 is removed as shown in FIG. 7B. Molding is completed.
The flange member 1 thus molded has the following first to fourth parting lines.
First parting line PL1: a height position in the middle of a perfect circle part 1d of the main body part 1a of the flange member 1, which is generated at the joint between the first mold K1 and the second mold K2, and is a perfect circle. An annular parting line along the circumference of part 1d.
Second parting line PL2: An annular parting line formed at the joint between the first die K1 and the third die K3 at the lower end inner diameter portion of the main body 1a of the flange member 1.
Third parting line PL3: An annular parting line of the upper end outer edge portion of the flange portion 1b of the flange member 1 generated at the joint between the second mold K2 and the third mold K3.
Fourth parting line PL4: between the first parting line PL1 and the second parting line PL2, which is generated at the joint between the first molds K1 and is along a surface passing through the central axis. Two straight parting lines that are formed.
With such a die structure, the flange member 1 of this embodiment has a perfect smooth surface H1 in which the parting line does not exist on the surface (lower surface) of the flange portion 1b on the male screw portion 1e side which is the uneven portion. Can be molded as.
That is, the flange member 1 of the present embodiment is a member with a flange portion for a drainage device, in which the surface of the flange portion 1b on the concave-convex portion side is configured to be smooth.

The above-mentioned drain trap and waterproof pan 8 for a washing machine are constructed as follows.
It should be noted that the floor on which the waterproof pan 8 for a washing machine is constructed is provided with an opening connected to the underfloor space, and the underfloor space is provided with underfloor piping connected to the sewer side piping.
First, the end of the underfloor pipe is connected to the discharge port 2a of the trap body 2, and the trap body 2 is placed in the underfloor space.
Next, the annular packing 7 of the drain trap is attached to the periphery of the attachment hole 8b of the waterproof pan 8 for a washing machine.
Next, the slip packing 6 is arranged on the annular packing 7, and the tubular portion of the flange member 1 is inserted into the mounting hole 8b of the waterproof pan 8 for a washing machine and the openings of the annular packing 7 and the slip packing 6.
Next, the flange member 1 is rotated to screw the female screw portion 2c of the trap body 2 into the male screw portion 1e of the flange member 1. When the screwing progresses sufficiently, the lower surface of the flange portion 1b of the flange member 1 and the upper edge of the opening of the trap body 2 are fitted to the peripheral edge of the mounting hole 8b of the waterproof pan 8 for a washing machine through the slip packing 6 and the annular packing 7. Since it is sandwiched, the drain trap is attached and fixed to the washing machine waterproof pan 8.
Further, at the time of this work, even if the flange portion 1b of the flange member 1 abuts with a strong stress enough to complete screwing, the slip packing 6 slides without sticking to the abutting surface of the flange portion 1b. Twist does not occur in the annular packing 7.
Next, the waterproof pan 8 for a washing machine is placed on the floor and fixed with screws or the like.
Next, the Owan member 3 of the water sealing member is locked to the inner flange portion 1c of the flange member 1, the antifoam pipe 5 is placed in the Owan member 3, and the deodorant cylinder 4 is placed from above the Owan member 3. After that, the outer flange portion of the deodorant cylinder 4 is watertightly locked and fixed to the inner flange portion 1c of the flange member 1. At this time, the Owan member 3 is fixed by being sandwiched between the inner collar portion 1c and the outer collar portion.
Next, the washing machine W is placed on the pedestal portion 8c of the washing machine waterproof pan 8.
Furthermore, the drainage hose for drainage of the washing machine W is connected to the upper end of the foam stop pipe pipe 5 of the drainage trap, and the construction of the washing machine W, the washing machine waterproof pan 8 and the drainage trap is completed.

In the washing machine W, the waterproof pan 8 for a washing machine, and the drain trap thus constructed, when drainage occurs due to the use of the washing machine W, the drainage from the washing machine W is changed from the hose pipe for drainage to the antifoam pipe pipe. 5, the deodorant cylinder 4, the inside of the Owan member 3, the opening of the upper side surface of the Owan member 3, and the inside of the trap body 2, and then discharged from the discharge port 2a to the sewer side through the underfloor pipe.
Further, when drainage occurs on the floor surface of the waterproof pan 8 for a washing machine due to damage to the hose pipe or the like, the drainage is introduced from the floor surface into the main body portion 1a of the flange member 1, the deodorant cylinder 4, the Owan member 3, It passes through the opening on the upper side surface of the Owan member 3 and the inside of the trap body 2, and is discharged from the discharge port 2a to the sewage side through the underfloor pipe.
Further, at this time, drainage is accumulated in the Owan member 3, so that the flow path from the deodorant cylinder 4 to the Owan member 3 is filled with water. Since odors and pests on the sewage side cannot pass through the flow path in the full water state, it is possible to prevent odors and pests on the sewage side from entering the indoor side. At this time, the drainage pool accumulated in the Owan member 3 is called sealing water, and the function of preventing the backflow of odors and harmful insects is called the trap function. The drain trap of this embodiment is a sealed drain trap that produces a trap function by sealing water.

When attaching the drain trap to the washing machine waterproof pan 8, watertight attachment is performed as follows.
At the time of construction, the lower surface of the flange portion 1b of the flange member 1 and the upper edge of the opening of the trap body 2 sandwich the peripheral edge of the attachment hole 8b of the waterproof pan 8 for a washing machine through the slip packing 6 and the annular packing 7. From this state, when the female screw portion 2c of the trap body 2 and the male screw portion 1e of the flange member 1 are sufficiently screwed together, as shown in FIG. 3, the lower surface of the flange portion 1b of the flange member 1 and the upper surface of the packing, The upper edge of the opening of the trap body 2 and the lower surface of the packing are strongly pressed and fixed by the stress due to the screwing. By such attachment, an abutment surface is formed in an annular shape along the packing, the flow of water leakage is blocked between the inside and the outside of the annular abutment surface, and a watertight connection is established.
Particularly, in the drain trap of the present embodiment, since there is no parting line on the lower surface which is the surface of the flange portion 1b on the screw portion side, the lower surface of the flange portion 1b and the slip packing 6, or the slip packing 6 and the annular packing 7 are provided. Covers the entire lower surface of the flange portion 1b with no gaps at all contact points, and completely cuts off between the main body side end portion of the lower surface of the flange portion 1b and the outer peripheral edge.
In particular, since the slip packing 6 has higher hardness and lower elasticity than the annular packing 7 made of a rubber material, a gap is apt to occur when the parting line is in the contact portion, but as described above, the male screw of the flange portion 1b is formed. Since there is no parting line on the lower surface, which is the surface on the side of the portion 1e, no gap is formed even if the slip packing 6 is used, and watertightness and airtightness are secured.
In this way, drainage on the washing machine waterproof pan 8 can be prevented from passing through the surface of the flange portion 1b on the male screw portion 1e side and reaching the main body portion 1a. Further, the drainage in the drain trap passes between the male screw portion 1e and the female screw portion 2c, further passes between the waterproof pan 8 for the washing machine and the upper edge of the trap body 2, and leaks to the underfloor space. Can be prevented.

The second embodiment of the present invention will be described below with reference to FIGS. 8 and 9.
The second embodiment of the present invention is exactly the same as the first embodiment in the construction method and the usage method, and the structure of the mold for molding the flange member 1, the molding method of the flange member 1, and the result thereof. The only difference is the position of the parting line of the flange member 1. Therefore, in the following description, the structure of the mold for molding the flange member 1, the molding method of the flange member 1, the resulting position of the parting line of the flange member 1, and the difference between the parting lines will be described. Only the details of construction and their effects that will be affected by the above will be explained.

  The flange member 1 includes a main body portion 1a having a substantially cylindrical shape, a flange portion 1b extending from the upper outer peripheral edge of the main body portion 1a in the outer peripheral direction along the peripheral edge, and the lower peripheral edge of the main body portion 1a. And an inner collar portion 1c protruding in the inner diameter direction. Further, on the outer side surface of the main body portion 1a, in order from the top, the flange portion 1b, the round portion 1d provided below the flange portion 1b without unevenness, and the trap body 2 provided below the round portion 1d are provided. It is provided with a male screw portion 1e as an uneven portion which is screwed with the female screw portion 2c. Here, the outer diameter of the male screw portion 1e is smaller than the outer diameter of the perfect circle portion 1d. In addition, the flange member 1 of the present embodiment is formed on the lower surface of the flange portion 1b and is concentric with the main body portion 1a by about 80% from the end portion on the main body portion 1a side to the outer edge by the molding method described later. An annular smooth area H2 having no parting line is formed in the area having the length.

The flange member 1 of this embodiment is molded by a mold including four parts, that is, a first mold K1 to a fourth mold K4.
The first mold K1 is the main body portion 1a of the flange member 1, and from the lower end of the main body portion 1a to a part of the male screw portion 1e and the round portion 1d, which are concave and convex portions provided on the main body portion 1a. Which is composed of two dies which are divided into right and left in a plane passing through the central axis of the main body 1a, and which move to the left and right sides of the main body 1a after the flange member 1 is molded. . In addition, an injection portion (not shown) for injecting the molten resin is provided at a position that is the lower end of the main body 1a of the first mold K1.
The second die K2 is the round portion 1d of the main body portion 1a of the flange member 1, which is a portion above the portion formed by the first die K1 and the lower surface of the flange portion 1b of the flange member 1. To form a smooth region H2 on the inner diameter side.
The third mold K3 is a mold for molding the main body portion 1a of the flange member 1 and the upper surface of the flange portion 1b and the inner portion of the main body portion 1a. It moves so as to escape above the member 1.
The fourth die K4 is the flange portion 1b of the flange member 1, and is a die for molding from the side surface upper end of the flange portion 1b to the smooth region H2 outer edge portion of the flange portion 1b. It is composed of two molds that are divided into left and right in a plane that passes through the central axis, and after the flange member 1 is molded, it moves to both the left and right sides of the main body 1a.

The flange member 1 of this embodiment is molded from the mold described in paragraph 0024 through the following steps.
First, as shown in FIG. 9A, the first mold K1 to the fourth mold K4 are combined, and the resin material melted from the lower end of the main body 1a of the flange member 1 is removed. The resin material that has been press-fitted and injected is cooled and solidified.
Next, the first die K1 and the fourth die K4 are divided along the plane passing through the central axis of the main body 1a, and are divided into left and right.
Next, the second mold K2 is moved downward in the direction along the central axis of the main body 1a. Since the outer diameter of the male screw portion 1e is smaller than the outer diameter of the perfect circle portion 1d, an undercut portion does not occur when the second die K2 is moved downward, and the second die K2 moves. Is done without any hindrance.
Finally, by moving the third mold K3 upward in the direction along the central axis of the main body 1a and removing it from the main body 1a, the flange member 1 is removed as shown in FIG. 9B. Molding is completed.
The flange member 1 thus molded has the following first to sixth parting lines PL6.
First parting line PL1: a height position in the middle of a perfect circle part 1d of the main body part 1a of the flange member 1, which is generated at the joint between the first mold K1 and the second mold K2, and is a perfect circle. An annular parting line along the circumference of part 1d.
Second parting line PL2: An annular parting line formed at the joint between the first die K1 and the third die K3 at the lower end inner diameter portion of the main body 1a of the flange member 1.
Third parting line PL3: An annular parting line of the upper end outer edge portion of the flange portion 1b of the flange member 1, which is generated at the joint between the third mold K3 and the fourth mold K4.
Fourth parting line PL4: between the first parting line PL1 and the second parting line PL2, which is generated at the joint between the first molds K1 and is along a surface passing through the central axis. Two straight parting lines that are formed.
Fifth parting line PL5: An annular parting line that divides the lower surface of the flange portion 1b generated at the joint between the second mold K2 and the fourth mold K4 into the smooth region H2 and the smooth region H2.
Sixth parting line PL6: between the third parting line PL3 and the fifth parting line PL5, which is generated at the joint between the fourth molds K4, along a plane passing through the central axis Two straight parting lines that are formed.
With such a die structure, the flange member 1 of the present embodiment has an annular smooth region H2 in which the parting line does not exist on the surface (lower surface) of the flange portion 1b on the male screw portion 1e side which is the uneven portion. Can be molded.
That is, the flange member 1 of the present embodiment is a member with a flange portion for a drainage device, in which an annular smooth region H2 is formed on the surface of the flange portion 1b on the concave-convex portion side.

When attaching the drain trap to the washing machine waterproof pan 8, watertight attachment is performed as follows.
At the time of construction, the mounting hole 8b of the waterproof pan 8 for a washing machine is inserted between the smooth region H2 of the lower surface of the flange portion 1b of the flange member 1 and the upper edge of the opening of the trap body 2 through the slip packing 6 and the annular packing 7. Hold the periphery. From this state, when the female screw portion 2c of the trap body 2 and the male screw portion 1e of the flange member 1 are sufficiently screwed together, the lower surface of the flange portion 1b of the flange member 1 and the upper surface of the packing, and the opening of the trap body 2 are opened. The rim and the lower surface of the packing are strongly pressed and fixed by the stress due to the screwing. By such attachment, an abutment surface is formed in an annular shape along the packing, the flow of water leakage is blocked between the inside and the outside of the annular abutment surface, and a watertight connection is established.
Particularly, in the drain trap of this embodiment, an annular smooth region H2 where no parting line exists is formed on the lower surface which is the surface of the flange portion 1b on the threaded portion side, and the lower surface of the flange portion 1b and the slip packing 6, The slip packing 6 and the annular packing 7 abut on the lower surface of the flange portion 1b without a gap in the smooth area H2, and completely cut off between the body side end of the lower surface of the flange portion 1b and the outer edge of the smooth area H2.
In particular, since the slip packing 6 has a higher hardness and a lower elasticity than the annular packing 7 made of a rubber material, there is a gap when the parting line is in the abutting portion, but the annular smooth region H2 causes the flange portion 1b to have a gap. Since there is no parting line that continuously extends from the inner diameter side end to the smooth region H2 outer edge, even if the slip packing 6 is used, a continuous gap is generated from the inner diameter side end of the flange portion 1b to the smooth region H2 outer edge. Watertightness and airtightness are secured.
In this way, drainage on the washing machine waterproof pan 8 can be prevented from passing through the surface of the flange portion 1b on the male screw portion 1e side and reaching the main body portion 1a. Further, the drainage in the drain trap passes between the male screw portion 1e and the female screw portion 2c, further passes between the waterproof pan 8 for the washing machine and the upper edge of the trap body 2, and leaks to the underfloor space. Can be prevented.

Although the embodiments of the present invention are as described above, the present invention is not limited to the above embodiments and can be freely modified within the scope of the invention. For example, in the above embodiment, the flange member 1 as the member with the flange portion is the drain trap flange member 1 attached to the waterproof pan 8 for a washing machine, but the present invention is not limited to the above embodiment. A drainage device of any drainage device may be used as long as it is a member with a flange portion of the drainage device that is attached to the drainage device, such as a bathtub, a bathroom, a washbasin, or a sink.
Further, in the above embodiment, the flange portion 1b is arranged at the upper end of the main body portion 1a of the flange member 1, but the present invention is not limited to the above embodiment, and the main body portion 1a of the flanged member is not limited to the above embodiment. It may be arranged at any height position such as a middle height position of the side surface.
Further, in the above-mentioned embodiment, the uneven portion of the flanged member is formed by the male screw portion 1e, but the present invention is not limited to the above-mentioned embodiment, and is provided along the side surface of the main body portion 1a. It may be a ridge or groove.

1 Flange member 1a Body part 1b Flange part 1c Inner flange part 1d Round part 1e Male screw part 2 Trap body 2a Discharge port 2b Plate part 2c Female screw part 3 Owan member 4 Deodorant cylinder 5 Antifoam pipe 6 Sliding packing
7 Ring packing 8 Waterproof pan 8a for washing machine Bottom part 8b Mounting hole 8c Pedestal part 8d Wall surface part H1 Smooth surface H2 Smooth area K1 First mold part K2 Second mold part K3 Third mold part K4 Second Four mold parts PL1 First parting line PL2 Second parting line PL3 Third parting line PL4 Fourth parting line PL5 Fifth parting line PL6 Sixth parting line S Gap W Washing machine

Claims (4)

A member with a flange portion for a drainage device,
A tubular body,
A flange portion provided along the peripheral edge of the side surface of the main body portion,
Consists of an uneven portion provided on the side surface of the main body,
A member with a flange portion for a drainage device, characterized in that the surface of the flange portion on the uneven portion side is configured to be smooth. A member with a flange portion for a drainage device,
A tubular body,
A flange portion provided along the peripheral edge of the side surface of the main body portion,
Consists of an uneven portion provided on the side surface of the main body,
A member with a flange portion for a drainage device, characterized in that an annular smooth region is formed on the surface of the flange portion on the uneven portion side. In the member with the flange portion of the above drainer,
The flange member for a drainage device according to claim 1 or 2, wherein the uneven portion is a male screw portion. A mold structure of a member with a flange portion of the drainage device according to any one of claims 1 to 3,
Molding the uneven portion of the main body part, dividing after molding and moving in the side direction of the main body part, and a first mold part,
Molding a smooth surface on the uneven portion side of the flange portion, a second mold portion that moves in the axial direction of the main body portion after the movement of the first mold portion,
The mold structure of the flanged member of the drainage device.

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