JP7197122B2 - Drainage structure of waterproof pan for bathroom - Google Patents

Description

TECHNICAL FIELD The present invention relates to a drainage structure for a bathroom waterproof pan.

2. Description of the Related Art In recent years, as waterproof pans for bathrooms that are lightweight and have heat insulating properties, various waterproof pans for bathrooms that include a foam layer have been developed. Since the foam layer has difficulty in watertightness and surface hardness, it has been devised to laminate a skin layer on the foam layer.

A bathtub-side waterproof pan (bathroom waterproof pan) disclosed in Patent Document 1 has a bottom member on which a bathtub is placed, and a side wall member connected to a rising portion of the peripheral edge of the bottom member. The bottom member and side wall members comprise layers of thermoplastic foam. A skin layer made of a thermoplastic resin is laminated on the entire upper surface of the foam layer of the bottom member.

The bottom member of the bathtub-side waterproof pan of Patent Document 1 is formed with a drain port through which the drain pipe from the bathtub passes, and a drain trap for receiving the drain water from the drain pipe is attached to the bottom surface of the bottom member. . However, Patent Document 1 does not clearly disclose a structure for attaching the drain trap to the foam layer of the floor member.

In FRP bathroom pans, the periphery of the drain is provided as a support collar, and a clamping flange is used to attach the drain trap to the bathroom pan. More specifically, the drain trap has a first cylindrical portion that enters the drain port, and an annular receiving portion that is formed on the outer periphery of the first cylindrical portion and extends along the lower surface of the support collar portion. The tightening flange includes a second cylindrical portion that enters the first cylindrical portion of the drain trap and is screwed with the first cylindrical portion, and a second cylindrical portion that protrudes radially outward from the upper end of the second cylindrical portion and extends onto the upper surface of the support flange. It has an annular flange along it.
The drain trap is attached to the bathroom waterproof pan by rotating the tightening flange in the tightening direction and sandwiching the support collar between the receiving portion of the drain trap and the flange portion of the tightening flange.

Japanese Patent Application Laid-Open No. 2007-278006

According to the drainage structure of the waterproof pan for bathroom made of FRP described above, it is possible to stably support the drain trap. It cannot be applied as is. The support collar, which has a skin layer laminated on the upper surface of the foam layer, has low rigidity in the vertical direction. This is because they cannot be supported stably.

In order to apply the above drainage structure to the bathroom waterproof pan of Patent Document 1, it is necessary to lower the foaming ratio of the foam layer to increase the rigidity of the support flange, which leads to an increase in weight and cost. . It is also conceivable to retrofit an injection-molded product that plays the role of a support brim to the drainage port of the bathroom waterproof pan, but this results in increased costs.

The present invention has been made to solve the above problems, and provides a drainage structure for a waterproof pan for a bathroom, which includes a foam layer and a skin layer covering the upper surface of the foam layer,
An annular support brim formed on the periphery of the drain port of the bathroom waterproof pan, a drainage trap having an annular receiving portion along the lower surface of the support brim, and an annular support brim along the upper surface of the support brim. A tightening flange having a flange portion and a connection means for connecting the drainage trap and the tightening flange,
In the connected state of the drain trap and the tightening flange, the drain trap is supported by the bathroom waterproof pan by sandwiching the support flange between the receiving part and the flange part,
The skin layer has an upper surface portion covering the upper surface of the support collar portion, and a tubular hanging portion hanging down from the upper surface portion and covering the inner peripheral surface of the support collar portion.

According to the above configuration, the hanging part of the skin layer at the drain port can increase the rigidity of the support flange, particularly the rigidity in the vertical direction. A drain trap can be stably supported at low cost.

Preferably, the drain trap has a first cylindrical portion that enters the drain port, the receiving portion is formed on the outer periphery of the first cylindrical portion, and the first connecting means of the connecting means is formed on the inner periphery of the first cylindrical portion. An engaging portion is formed, the clamping flange has a second tubular portion that fits into the first tubular portion of the drain trap, and the flange portion extends radially outward at the upper end of the second tubular portion. A second engaging portion of the coupling means is formed on the outer circumference of the second cylindrical portion so as to protrude, and the first engaging portion and the second engaging portion are engaged as the tightening flange rotates in the tightening direction. Engagement of the mating portion causes the flange portion to approach the receiving portion, and an annular packing is interposed at least between the flange portion and the support collar portion.

In one aspect of the connecting means, the first engaging portions are formed of guide projections arranged at equal intervals in the circumferential direction and each spirally forming guide projections, and the second engaging portions are arranged at equal intervals in the circumferential direction. It consists of an engagement projection arranged at the bottom and guided by the guide projection.
In another aspect of the connecting means, the first engaging portion is a female thread, and the second engaging portion is a male thread.

ADVANTAGE OF THE INVENTION According to the present invention, the rigidity of the supporting flange of the drain port can be increased without lowering the expansion ratio of the foam layer and without requiring a separate injection-molded product. The drain trap can be stably supported while maintaining a light weight and without increasing manufacturing costs.

1 is a plan view of a bathtub-side waterproof pan according to an embodiment of the present invention; FIG. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1; Fig. 4 is an enlarged cross-sectional view showing the drainage structure of the bathtub-side waterproof pan. FIG. 4 is a view equivalent to FIG. 3 showing a state immediately before engaging the tightening flange with the drainage trap in the drainage structure;

An embodiment of the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 and 2, on the floor slab of the space in the building where the bathroom unit is housed or on the foundation for the bathroom unit, there are a bathtub-side waterproof pan 1 (bathroom waterproof pan) and a washing area-side waterproof pan 2 (bathroom). A waterproof pan) is installed adjacently. A bathtub 3 is installed in the bathtub side waterproof pan 1. - 特許庁In this embodiment, the present invention is applied to the waterproof pan 1 on the bathtub side.

The bathtub-side waterproof pan 1 is placed on a pedestal 4 and supported. The frame 4 has a frame 4a parallel to the long sides of the rectangle of the waterproof pan 1 on the bathtub side, and two frames 4b having one end connected to the frame 4a and parallel to the short sides of the rectangle. Supporting legs 4c resting on the floor slab are fixed to both ends and the central portion of the frame 4a and to the central portion of the frame 4b.

The bathtub-side waterproof pan 1 has a rectangular plane shape, and has a bottom portion 11 and rising portions 12a and 12b formed along the entire periphery thereof.
The bottom portion 11 is formed with a low convex portion 11a on which the legs of the bathtub 3 are placed. A drain port 15 is formed in the bottom part 11 near the waterproof pan 2 on the washing place side. A peripheral portion of the drain port 15 is thinner than other portions and provided as an annular support brim portion 16, which will be described later.

In the bathtub-side waterproof pan 1, a rising portion 12a corresponding to one long side of the rectangle is connected to the wash-place-side waterproof pan 2, and a rising portion 12b corresponding to the other long side and two short sides defines the bathroom. It is adapted to support a wall panel 5 which consists of:

As shown in FIG. 3, the bathtub-side waterproof pan 1 is composed of a thermoplastic resin foam layer 10a and a thermoplastic resin skin layer 10b laminated on the upper surface of the foam layer 10a. In this embodiment, first, a styrene-based resin sheet such as polystyrene (PS), HIPS, ABS, or the like is vacuum-formed to obtain the skin layer 10b corresponding to the shape of the upper surface of the bathtub-side waterproof pan 1 described above. The thickness of the skin layer 10b is, for example, 1 to 4 mm, preferably 1 to 3 mm, more preferably 1 to 2 mm.
After that, the skin layer 10b is set in a foaming mold, and a foam layer 10a made of expanded polystyrene (EPS) is obtained by bead foaming. Since the foam layer 10a and the skin layer 10b are heat-sealed in the process of foam molding, the step of bonding the two can be omitted. Note that the foam layer 10a and the skin layer 10b may be bonded together with an adhesive.

The skin layer 10b covers the upper surface of the bottom portion 11 and the inner and upper surfaces of the rising portions 12a and 12b.
As shown in FIGS. 3 and 4 , the skin layer 10 b covers the upper surface of the support collar portion 16 and the inner periphery of the support collar portion 16 at the drain port 15 . Hereinafter, the portion of the skin layer 10b that covers the upper surface of the support collar portion 16 is referred to as an upper surface portion 10x, and the portion that covers the inner periphery of the support collar portion 16 is referred to as a drooping portion 10y. The drooping portion 10y has a cylindrical shape and is connected to the upper surface portion 10x at a substantially right angle. Due to the drooping portion 10y of the skin layer 10b, the support collar portion 16 can be significantly increased in rigidity, particularly in the vertical direction, compared to the case where the support collar portion 16 is composed of the foam layer 10a and the upper surface portion 10x of the skin layer 10b.

As shown in FIGS. 3 and 4, the drainage structure 8 of the bathtub-side waterproof pan 1 includes the above-described support flange 16 of the bathtub-side waterproof pan 1 and the bathtub-side drainage trap 20 each made of an injection-molded resin product. A drain trap 30 and a clamping flange 40 are provided.

The drainage trap 20 includes a tubular portion 21 (first tubular portion) that enters the drainage port 15, a bottom portion 22 that continues to the lower end of the tubular portion 21, and an annular receiving portion 23 that is formed on the outer circumference of the intermediate height of the tubular portion 21. and an extending portion 24 extending from the receiving portion 23 toward the washing area. The receiving portion 23 extends along the lower surface of the support collar portion 16 .

A low annular raised portion 25 is formed on the upper surface of the receiving portion 23, and a shallow groove formed between the raised portion 25 and the cylindrical portion 21 is filled with a sealing material (not shown). It's like

A main drain port 22a is formed in the center of the bottom portion 22 of the drain trap 20, and a plurality of slit-shaped sub-drain ports 22b are formed beside it. The tip of a drain pipe (not shown) connected to the bottom of the bathtub 3 is inserted into the drain port 22a.

A common drain trap 30 is attached to the lower side of the drain trap 20 and the drain trap 2a (only a part of which is shown) of the drain structure of the waterproof pan 2 on the washing area side.
The common drain trap 30 receives hot water from the bathtub 3 discharged from the main drain port 22a through the drain pipe, receives hot water from the bottom 11 of the bathtub side waterproof pan 1 via the drain port 22b, and receives hot water from the bathtub side waterproof pan 1 via the drain port 22b. It receives the hot water on the washing place side discharged through the drain trap 2a of 2. Wastewater received by this common drain trap 30 is discharged from one outlet to another drainpipe.

The tightening flange 40 has a cylindrical portion 41 (second cylindrical portion) that fits inside the cylindrical portion 21 of the drain trap 20, and an annular flange portion 42 that protrudes radially outward from the upper end of the cylindrical portion 41. doing. A support groove 41 a for supporting the O-ring 51 is formed adjacent to the flange portion 42 on the outer periphery of the cylindrical portion 41 . A support groove 42 a for supporting the annular packing 52 is formed in the outer peripheral edge of the flange portion 42 .

The drain trap 20 and the tightening flange 40 are connected to each other by a bayonet lock structure R (connecting means). That is, a plurality (four) of guide projections 29 (first engaging portions) 29 (first engaging portions) are formed at equal intervals on the inner periphery of the cylindrical portion 21 of the drain trap 20 so as to draw a spiral and extend to the vicinity of the bottom portion. On the other hand, a plurality of (four in the present embodiment) engagement protrusions 49 (second engagement portions) are formed at equal intervals on the outer periphery of the lower end of the tubular portion 41 of the clamping flange 40 .

As shown in FIG. 4, by lowering the tightening flange 40 and inserting its cylindrical portion 41 into the cylindrical portion 21 of the drain trap 20 and turning it in the tightening direction, the engaging projection 49 is guided by the guide projection 29. , the clamping flange 40 moves downwards. Eventually, the packing 52 hits the upper surface of the support flange 16 of the waterproof pan 1 on the bathtub side, and the annular receiving portion 23 of the drainage trap 20 hits the lower surface of the support flange 16 .

When the tightening flange 40 is further rotated and the rotation angle reaches approximately 90°, the engaging projection 49 reaches the lower end of the guide projection 29, and the connection between the drain trap 20 and the tightening flange 40 is completed. In this connected state, the packing 52 is elastically deformed and presses the upper surface of the support collar portion 16, and the receiving portion 23 of the drainage trap 20 and the flange portion 42 of the tightening flange 40 are connected to the support collar of the bathtub side waterproof pan 1. The portion 16 is sandwiched by the elastic force of the packing 52 . Thus, the drain trap 20 is attached to the bathtub-side waterproof pan 1. - 特許庁

The supporting collar portion 16 is reinforced by the drooping portion 10y of the skin layer 10b and has increased rigidity, particularly vertical rigidity. can be supported by

The present invention is not limited to the above embodiments, and various forms can be adopted.
The connection means may be composed of a female thread formed on the inner periphery of the tubular portion 21 of the drain trap 20 and a male thread formed on the outer periphery of the tubular portion 41 of the tightening flange. This structure can be easily conceived by replacing the guide protrusions 29 with female threads and replacing the engagement protrusions with male threads in FIGS. Drain 15, drain trap 20 and clamping flange 40 may be other than circular. The skin layer 10 b may also be provided on the back surface of the edge of the drain port 15 .
Instead of the illustrated packing 52, an annular packing having a U-shaped cross section may be used. This packing is arranged so as to cover the upper surface, the lower surface, and the inner peripheral surface of the support collar portion 16 .
Although the present invention is applied to the waterproof pan on the bathtub side in the above embodiment, the present invention may be applied to the waterproof pan on the washing area side.
A bathroom in the present application also includes a bathroom (shower room) in which only a shower is possible.

INDUSTRIAL APPLICABILITY The present invention is applicable to the drainage structure of waterproof pans for bathrooms.

1 Bathtub side waterproof pan (bathroom waterproof pan)
8 Drainage structure 10a Foam layer 10b Skin layer 10x Upper surface portion 10y Drooping portion 15 Drainage port 16 Support collar portion 20 Drainage trap 21 Cylinder portion (first cylinder portion)
23 Receiving portion 29 Guide projection (first engaging portion)
40 tightening flange 41 cylindrical portion (second cylindrical portion)
42 flange portion 49 engagement projection (second engagement portion)
52 Packing R Bayonet lock structure (connecting means)

Claims (4)

A drainage structure for a waterproof pan for a bathroom comprising a foam layer and a skin layer covering the upper surface of the foam layer,
An annular support brim formed on the periphery of the drain port of the bathroom waterproof pan, a drainage trap having an annular receiving portion along the lower surface of the support brim, and an annular support brim along the upper surface of the support brim. A tightening flange having a flange portion and a connection means for connecting the drainage trap and the tightening flange,
In the connected state of the drain trap and the tightening flange, the drain trap is supported by the bathroom waterproof pan by sandwiching the support flange between the receiving part and the flange part,
A bathroom characterized in that the skin layer has an upper surface portion covering the upper surface of the support collar portion at the drain outlet, and a cylindrical hanging portion hanging down from the upper surface portion and covering the inner peripheral surface of the support collar portion. Drainage structure of waterproof pan for water. The drain trap has a first cylindrical portion that enters the drain port, the receiving portion is formed on the outer periphery of the first cylindrical portion, and the first engaging portion of the connecting means is formed on the inner periphery of the first cylindrical portion. is formed and
The tightening flange has a second tubular portion that fits into the first tubular portion of the drain trap, and the flange portion is formed at the upper end of the second tubular portion so as to protrude radially outward. A second engaging portion of the connecting means is formed on the outer periphery of the portion,
As the tightening flange rotates in the tightening direction, the flange portion approaches the receiving portion due to the engagement between the first engaging portion and the second engaging portion,
2. A drainage structure for a bathroom waterproof pan according to claim 1, wherein an annular packing is interposed at least between said flange portion and said support brim portion. The first engaging portions are arranged at equal intervals in the circumferential direction and are formed of guide projections each drawing a spiral, and the second engaging portions are arranged at equal intervals in the circumferential direction and are the guide projections. 3. A drainage structure for a waterproof pan for a bathroom according to claim 2, wherein said engaging protrusions are guided to said watertight pan. 3. The drainage structure of a waterproof pan for a bathroom according to claim 2, wherein the first engaging portion comprises a female thread and the second engaging portion comprises a male thread.

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