JP6078944B2 - Bath lid - Google Patents

Description

  An aspect of the present invention relates to a bath lid placed on a bathtub.

  In response to the recent increase in environmental awareness, one of the major challenges is to increase the heat retention of hot water in the bathtub. In response to this problem, high thermal insulation is also demanded for bath lids that have a large effect on heat retention.

Conventionally, as a bath lid having high heat insulating properties, a material in which a heat insulating material is sandwiched or filled between front and back resin face materials has been used.
Highly heat-insulating bath lids inevitably cause a temperature difference between the upper surface and the lower surface of the lid in actual use in which the bath is kept warm in a cold environment such as winter. Due to this temperature difference, the amount of thermal expansion of the material on the upper and lower surfaces of the lid changes, and an event occurs in which the lid warps in a bimetallic shape.

  In order to reduce such warpage of the bath lid, there is also a method of taking a measure of the constituent material of the bath lid as a material having a sufficiently small linear expansion coefficient. For example, the use of a metal thin plate such as aluminum as the constituent material of the bath lid, the use of a special resin, or a configuration using a reinforcing material such as glass fiber or carbon fiber can be mentioned.

In Patent Document 1, a glass fiber or carbon fiber having a small coefficient of linear expansion is formed into a rough net shape to constitute a warp prevention member, and a flat bath lid provided with the warp prevention member on the front and back surfaces of the heat insulating material. Is disclosed. With such a configuration, warping of the bath lid during use is prevented.
However, any of these means has a problem that the weight is increased and the cost is increased.

  In addition, a means for sufficiently increasing the structural bending strength of the bath lid itself to counter the bending stress due to thermal expansion can be considered. However, an increase in weight and cost cannot be avoided, and if the bending strength is simply improved, the bending stress due to the linear expansion coefficient inevitably increases. Furthermore, an increase in the weight of the bath lid has a great influence on usability.

JP 2006-175112 A

  The present invention has been made on the basis of recognition of such a problem, and without using a special material, while suppressing an increase in weight and cost, while reducing the thermal warp of a highly insulating bath lid, The purpose is to provide an easy-to-use bath lid.

1st invention is a bath lid mounted on a bathtub, Comprising: The lower surface side member which faces the said bathtub, The upper surface side member which opposes the said lower surface side member, The said upper surface side member, The said lower surface side member When provided between the, provided between the and the planar heat insulating member including a tree fat bag body that having a air layer, the so as not to contact with the lower surface member and the heat insulating member and the upper side member And an aggregate having a larger bending strength than the upper surface side member and the lower surface side member, and the thermal expansion of the lower surface side member when the bath lid is heated with hot water of the bathtub, rather smaller than the thermal expansion of the upper side member, in a state in which the bath lid is placed on the tub, said heat insulating member is disposed within the tub below the rim of the tub, above the heat insulating member The bath lid is characterized in that the aggregate is disposed in the bath lid.

According to this bath lid, the thermal expansion of the lower surface side member is suppressed to be smaller than the thermal expansion of the upper surface side member, and the aggregate having a large bending strength is disposed immediately below the upper surface side member, and the aggregate is disposed below the aggregate. By disposing a heat insulating member with higher heat insulating properties, it is possible to suppress the aggregate on the upper side from being linearly expanded by being warmed by the hot water in the bathtub, thereby reducing the bending stress generated in the aggregate. Can do. That is, bimetallic warpage of the aggregate can be suppressed.
As a result, it is possible to prevent warping of the bath lid due to a temperature difference between the upper and lower surfaces without using a special material, and to achieve light weight and low cost.

  Moreover, 2nd invention is a bath lid characterized by the said resin bag body being comprised by the bubble buffer material of at least 1 layer in 1st invention.

  According to this bath lid, since an existing cushioning material can be used as the resin bag body, a low-cost and lightweight bath lid can be provided.

  According to a third aspect of the present invention, in the second aspect of the invention, the linear expansion coefficient of the material of the lower surface side member is smaller than the linear expansion coefficient of the material of the upper surface side member.

  According to this bath lid, by making the linear expansion coefficient of the material of the lower surface side member smaller than the linear expansion coefficient of the material of the upper surface side member, the temperature of the bath lid due to the temperature difference between the upper and lower surfaces can be reduced without using a special material. Warpage can be suppressed.

Moreover, 4th invention is further equipped with the columnar member provided in the inside of the said heat insulation member in the 2nd invention, and extended in the thickness direction of the said heat insulation member, and the compressive strength of the said columnar member is the said resin. It is a bath lid characterized by being larger than the compressive strength of a bag.

According to this bath lid, the thermal stress applied to the lower surface side member can be transmitted to the upper surface side member and the resin bag body by the columnar member and offset by these compressive stresses. Thereby, the thermal expansion of the lower surface side member can be suppressed, and the deformation of the bath lid due to the heat in the bathtub can be suppressed.
Further, according to this bath lid, it is possible to prevent the bath lid from warping due to a temperature difference between the upper and lower surfaces without using a special material, and to achieve light weight and low cost.
Moreover, it is possible to use a common material for the upper surface side member and the lower surface side member, and it is possible to use it as a bath lid without front and back surfaces.

  According to the aspect of the present invention, it is possible to reduce the thermal warp of a highly heat-insulating bath lid without using a special material and without increasing the weight and cost, and provide a bath lid with improved usability. The

(A)-(b) is a schematic diagram which illustrates the bath lid concerning embodiment. (A)-(b) is a schematic diagram explaining a 1st specific example. (A)-(b) is a schematic diagram explaining the 2nd specific example. (A)-(b) is a schematic diagram explaining the 3rd specific example. (A)-(b) is a schematic diagram explaining the 4th specific example. (A)-(b) is a schematic diagram explaining the 5th specific example. (A)-(b) is a schematic diagram explaining the 6th specific example.

Embodiments of the present invention will be described below with reference to the drawings. In addition, in each drawing, the same code | symbol is attached | subjected to the same component and detailed description is abbreviate | omitted suitably.
Drawing 1 (a)-(b) is a mimetic diagram which illustrates a bath lid concerning an embodiment.
FIG. 1A is a schematic perspective view illustrating a state in which the bath lid 110 is placed in the bathtub 300, and FIG. 1B is a schematic cross-sectional view taken along line AA shown in FIG. is there.
As illustrated in FIG. 1A, the bath lid 110 according to the embodiment is a flat lid that is placed on the upper surface 311 of the rim portion 310 of the bathtub 300.

  The bath lid 110 blocks the opening 301 of the bathtub 300 and prevents the heat of the hot water W stretched in the bathtub 302 from escaping to the outside. The bathtub 300 is configured such that a space in the bathtub 302 is formed by the bottom portion 330 and the side wall 320, and the rim portion 310 is provided outward from the upper end of the side wall 320.

  The bath lid 110 is disposed so as to be passed over the upper surface 311 of the rim portion 310 provided at the upper end of the opposite side wall 320. In the bathtub 300, one or a plurality of bath lids 110 are prepared to block the entire opening 301. In the example shown in FIG. 1A, two bath lids 110 are arranged side by side in a bathtub 300, and the entire opening 301 is covered by these bath lids 110.

  When the bath lid 110 is placed on the upper surface 311 of the bathtub 300, the lower surface side member 10 facing the bathtub 300, the upper surface side member 20 facing the lower surface side member 10 and provided on the opposite side of the bathtub 300, A flat bath lid body 100 including

  The bath lid body 100 of the bath lid 110 includes a heat insulating member 30 provided between the upper surface side member 20 and the lower surface side member 10. The heat insulating member 30 includes a planar resin bag body having an air layer.

The bath lid main body 100 of the bath lid 110 includes an aggregate 40 provided between the upper surface side member 20 and the lower surface side member 10. The bending strength of the aggregate 40 is larger than the bending strength of the upper surface side member 20 and the bending strength of the lower surface side member 10.
Here, the bending strength means the maximum stress until the member breaks when subjected to bending deformation.

  The bath lid 110 according to the embodiment is configured such that the thermal expansion amount of the lower surface side member 10 when the bath lid main body 100 is heated by the hot water W of the bathtub 300 is smaller than the thermal expansion amount of the upper surface side member 20. ing.

  When the bath lid 110 is placed on the upper surface 311 of the bathtub 300, the heat of hot water W (about 42 ° C.) is applied to the lower surface side member 10. On the other hand, the temperature of the bathroom (for example, 5 ° C. to 30 ° C.) is applied to the upper surface side member 20. Thus, even if there is a temperature difference between the upper and lower surfaces of the bath lid 110, in the bath lid 110 according to the embodiment, a large difference occurs between the thermal expansion force of the lower surface side member 10 and the thermal expansion force of the upper surface side member 20. Accordingly, warping of the bath lid 110 is suppressed.

  Generally, in a flat structure having a uniform linear expansion coefficient, when a temperature difference occurs between the front surface and the back surface, a difference (hereinafter referred to as “difference Δ”) occurs between the expansion amounts of the front surface and the back surface. . A part of the difference Δ in the expansion amount is converted and absorbed as internal stress of the structure, and the portion that is not converted and absorbed generates bending stress in the structure and appears in the form of thermal warping.

  In the bath lid 110 according to the embodiment, for example, the linear expansion coefficient of the material of the lower surface side member 10 is made smaller than the linear expansion coefficient of the material of the upper surface side member 20. That is, as the material of the lower surface side member 10, a material having a linear expansion coefficient smaller than that of the material of the upper surface side member 20 is used. Thereby, the thermal expansion amount of the lower surface side member 10 when the bath lid main body 100 is heated by the hot water W of the bathtub 300 is configured to be smaller than the thermal expansion amount of the upper surface side member 20.

  By making the linear expansion coefficient of the material of the lower surface side member 10 smaller than the linear expansion coefficient of the material of the upper surface side member 20, the temperature of the lower surface side member 10 of the bath lid 110 becomes higher than the temperature of the upper surface side member 20. Even if a temperature difference occurs, the difference between the linear expansion amount of the lower surface side member 10 and the linear expansion amount of the upper surface side member 20 becomes smaller than the above difference Δ, and the thermal warpage of the bath lid 110 can be suppressed. it can.

For example, the linear expansion coefficient of the lower surface side member 10 is set to be equal to or less than half of the linear expansion coefficient of the upper surface side member 20. Thereby, even if heat is applied to the lower surface of the bath lid 110, the bath 300 can be reliably sealed with the bath lid 110 without greatly affecting the hermeticity of the bath 300.
In the above configuration, warping of the bath lid 110 can be suppressed by using materials having different linear expansion coefficients.

Further, in the bath lid 110 according to the embodiment, the linear expansion coefficients of the lower surface side member 10 and the upper surface side member 20 are made the same, and the mechanical bending strength of the upper surface side member 20 is made higher than that of the lower surface side member 10. Also good. For example, the thickness of the lower surface side member 10 is made thinner than the thickness of the upper surface side member 20, and the mechanical bending strength of the upper surface side member 20 is made larger than that of the lower surface side member 10. Thereby, the thermal expansion amount of the lower surface side member 10 when the bath lid main body 100 is heated by the hot water W of the bathtub 300 is configured to be smaller than the thermal expansion amount of the upper surface side member 20.
In said structure, the curvature of the bath lid 110 can be suppressed by adjusting the thickness of the lower surface side member 10 and the upper surface side member 20.

  In the bath lid 110 according to the embodiment, the linear expansion coefficient of the material of the lower surface side member 10 is made smaller than the linear expansion coefficient of the material of the upper surface side member 20, and further, the upper surface side member 20 than the lower surface side member 10. The mechanical bending strength may be increased (for example, the thickness of the lower surface side member 10 is thinner than the thickness of the upper surface side member 20). Also by adjusting both the linear expansion coefficient and the bending strength, the thermal expansion amount of the lower surface side member 10 when the bath lid body 100 is heated by the hot water W of the bathtub 300 is the thermal expansion amount of the upper surface side member 20. Configured to be smaller.

In the bath lid 110 according to the embodiment, since the aggregate 40 is included in the bath lid body 100, it is possible to provide the bath lid 110 that is less likely to warp.
For example, when the bath lid 110 is placed on the bathtub 300, the heat of the hot water W in the bathtub 302 is applied to the bath lid body 100. The deformation amount of the aggregate 40 caused by this heat is smaller than the deformation amount of the lower surface side member 10.
For example, when the heat of hot water W is applied to the lower surface side member 10, thermal stress is generated inside the lower surface side member 10. Even when a part or all of the thermal stress is distorted to cause bending deformation of the aggregate 40, the deformation amount of the aggregate 40 is smaller than the deformation amount of the lower surface side member 10, so that the bath lid 110 is greatly warped. Will not occur.

Further, the aggregate 40 having a high bending strength is disposed immediately below the upper surface side member 20 (the bathtub 300 side), and the heat insulating member 30 having a higher heat insulating property than the aggregate 40 is disposed below the aggregate 40, thereby lower surface side. The aggregate 40 located above the member 10 is prevented from being linearly expanded by being warmed by the temperature of the hot water W in the bathtub 302. Thereby, the bending stress which generate | occur | produces in the aggregate 40 can be suppressed small, and it can suppress that the aggregate 40 warps in bimetallic form.
In addition, since the aggregate 40 has a higher bending strength than the upper surface side member 10 and the lower surface side member 20, deformation due to a load applied to the bath lid 110 can be suppressed by the aggregate 40.

Next, a specific example of the bath lid according to the embodiment will be described.
In the following description, when the bath lid and the bath lid main body according to each specific example are shown, the reference numerals given in the description of each specific example are used, and when referring generically without distinction, the bath lid 110 and the bath lid are used. The main body 100 is assumed.

FIGS. 2A and 2B are schematic diagrams for explaining a first specific example.
FIG. 2A is a schematic perspective view, and a part of the cross section is taken along line AA shown in FIG. FIG. 2B shows a schematic cross-sectional view along the line AA shown in FIG.

The bath lid 120 according to the first specific example includes a bath lid body 100 including the lower surface side member 10 and the upper surface side member 20. The bath lid body 100 further includes an aggregate 40 and a heat insulating member 30 </ b> A provided between the lower surface side member 10 and the upper surface side member 20.
That is, the bath lid main body 100 has a structure in which the aggregate 40 and the heat insulating member 30 </ b> A are sandwiched between the lower surface side member 10 and the upper surface side member 20. The aggregate 40 is disposed between the upper surface side member 20 and the heat insulating member 30A.

Also in the bath lid 120 according to the first specific example, the thermal expansion amount of the lower surface side member 10 when the bath lid main body 100 is heated by the hot water W of the bathtub 300 is similar to the above. It is comprised so that it may become smaller than the amount of expansion.
For example, the linear expansion coefficient of the material of the lower surface side member 10 is smaller than the linear expansion coefficient of the material of the upper surface side member 20.

In the bath lid 120, as a material of the upper surface side member 20, for example, at least one of ABS (Acrylonitrile Butadiene Styrene), PP (polypropylene), and PE (Polyethylene) is used.
In the bath lid 120, when PP is used as the material of the upper surface side member 20, the thickness of the upper surface side member 20 is, for example, not less than 0.5 millimeters (mm) and not more than 1.0 mm.

In the bath lid 120, as the material of the lower surface side member 10, for example, at least one of PS (polystyrene), PC (Polycarbonate), PPO (Polyphenyleneoxide), ABS, and PVC (polyvinyl chloride) is used.
In the bath lid 120, when PS is used as the material of the lower surface side member 10, the thickness of the lower surface side member 10 is, for example, 0.5 mm or more and 1.0 mm or less.

A material having a bending strength larger than the bending strength of the upper surface side member 20 and the lower surface side member 10 is used for the aggregate 40. For the aggregate 40, various materials such as plywood, various resin materials including plastic corrugated cardboard, and honeycomb molded plate are used.
The thickness of the aggregate 40 is, for example, 5 mm or more and 10 mm or less.

In the bath lid 120, the heat insulating member 30A includes a resin bag body including a cylindrical air bag AB. The resin bag body is provided with a plurality of air bags AB. Each of the plurality of air bags AB extends in one direction, and is arranged in parallel in a direction orthogonal to the extending direction.
As a material of the resin bag body, for example, at least one of PE (polyethylene), PVC (polyvinyl chloride), rubber, and urethane is used. The resin bag body is configured such that a film of this material is formed into a bag shape to form a plurality of air bags AB, and air is enclosed in the plurality of air bags AB.

  In the bath lid 120, since the heat insulating member 30 </ b> A is included in the bath lid main body 100, the heat insulating property can be further enhanced, and the thermal expansion of the upper surface side member 20 due to the hot water W of the bathtub 300 can be suppressed to be small. The thermal expansion of 120 can be reduced.

  In the bath lid 120, the aggregate 40 is disposed between the upper surface side member 20 and the heat insulating member 30. That is, the aggregate 40 is provided immediately below the upper surface side member 20 and on the side away from the bathtub 300 with respect to the heat insulating member 30.

When the bath lid 120 is placed on the bathtub 300, the bathtub 300 side (lower side) of the bath lid main body 100 becomes hotter than the opposite side (upper side) of the bathtub 300. With respect to the arrangement of the heat insulating member 30 and the aggregate 40, by disposing the heat insulating member 30 on the higher temperature side, the heat of the hot water W is absorbed by the heat insulating member 30 and the influence of the heat given to the aggregate 40 thereon. Suppress.
Therefore, the bending stress and thermal deformation of the aggregate 40 itself can be suppressed to a small level, and a large thermal warpage of the entire bath lid 120 can be suppressed.
With such a configuration, the thermal warping of the bath lid 120 due to the temperature difference between the upper and lower surfaces is sufficiently suppressed without using a special material, and the light weight and low cost of the bath lid 120 are achieved.

FIG. 3 is a schematic diagram illustrating a second specific example.
Fig.3 (a) is typical sectional drawing, The cross section along the AA line represented to Fig.1 (a) is represented by the part. FIG. 3B shows a schematic cross-sectional view along the line AA shown in FIG.
In the bath lid 130 according to the second specific example, a heat insulating member 30B is used instead of the heat insulating member 30A of the bath lid 120 according to the first specific example.

  The heat insulating member 30B applied in the bath lid 130 includes a planar resin bag body (bubble cushioning material) filled with air. The bubble cushioning material is a plurality of substantially cylindrical air bags AC arranged on the support film FB. For example, at least one of PE and PP is used as the material of the bubble cushioning material.

The bath lid body 100 </ b> B has a configuration in which a heat insulating member 30 </ b> B is sandwiched between the lower surface side member 10 and the upper surface side member 20. The heat insulating member 30B may have a structure in which a plurality of bubble buffer materials are stacked.
By using such a heat insulating member 30 </ b> B, in the bath lid 130, weight reduction of the bath lid 130 is achieved as well as heat insulation in an air layer included in the heat insulating member 30 </ b> B. Moreover, the existing shock absorbing material can be utilized and low cost is achieved.

FIG. 4 is a schematic perspective view illustrating a third specific example.
Fig.4 (a) is typical sectional drawing, The cross section along the AA line represented to Fig.1 (a) is represented by the one part. FIG. 4B shows a schematic cross-sectional view along the line AA shown in FIG.
In the bath lid 140 according to the third specific example, a heat insulating member 30C is used instead of the heat insulating member 30A of the bath lid 120 according to the first specific example.

The heat insulating material 30C applied by the bath lid 140 includes open-cell urethane (open cell). That is, the bath lid main body 100 </ b> C of the bath lid 140 has a structure in which the aggregate 40 and the heat insulating member 30 </ b> C are sandwiched between the lower surface side member 10 and the upper surface side member 20.
The heat insulating member 30 </ b> C includes an upper heat insulating portion 31 and a lower heat insulating portion 32. The aggregate 40 is provided between the upper heat insulating part 31 and the lower heat insulating part 32.

  In the bath lid 140, the upper and lower sides (front and back) are provided almost symmetrically with the aggregate 40 in between. In the bath lid 140, a common material may be used as the material of the upper surface side member 20 and the lower surface side member 10. Thereby, it becomes possible to use it as the bath lid 140 without front and back.

In order to manufacture the bath lid 140, the aggregate 40 is sandwiched between the upper heat insulating material 31 and the lower heat insulating material 32 containing open-cell urethane (open cell), and each of these interfaces is fixed with an adhesive. Form a structure. Then, the structure is covered with the upper surface side member 20 and the lower surface side member 10, and all the peripheral portions of the upper surface side member 20 and the lower surface side member 10 are sealed in a state where high-pressure air is sealed inside the open cell urethane (open cell body). The circumference is hermetically sealed, for example, by heat sealing (thermal welding).
Thereby, the surface rigidity of the bath lid 140 can be obtained by the pressure of the air sealed inside the open cell urethane (open cell body) while maintaining the planar shape.

FIG. 5 is a schematic perspective view illustrating a fourth specific example.
Fig.5 (a) is typical sectional drawing, The cross section along the AA line represented to Fig.1 (a) is represented by the part. FIG. 5B shows a schematic cross-sectional view along the line AA shown in FIG.
In the bath lid 150 according to the fourth specific example, a heat insulating member 30D is used instead of the heat insulating member 30A of the bath lid 120 according to the first specific example.

  The heat insulating member 30 </ b> D applied in the bath lid 150 includes a heat insulating material body 35 and a columnar air bag 36 provided inside the heat insulating material body 35. Examples of the material of the heat insulating material body 35 include bead-based foam materials (EPS, EPP, etc.), extruded foam materials (XPS, XPE, etc.), cotton-like heat insulating materials (glass wool, polyester, cotton, etc.), and low-strength foam. At least one of materials (foamed urethane, foamed EVA, etc.) is used. The air bag 36 is formed by sealing air into a resin film bag into a columnar shape. The heat insulating material body 35 is provided with a plurality of air bags 36. Each of the plurality of air bags 36 extends in one direction, and is arranged in parallel at a predetermined interval in a direction orthogonal to the extending direction.

The columnar air bag 36 is inserted into a hole 35 h provided in the heat insulating material body 35. In the bath lid 150, the positional relationship and balance between the heat insulating material body 35 and the air bag 36 can be arbitrarily adjusted by the number and positions of the holes 35 h provided in the heat insulating material body 35.
In such a bath lid 150, the thermal warpage of the entire bath lid 150 is suppressed, and the weight and cost reduction of the bath lid 150 are achieved.

FIG. 6 is a schematic perspective view illustrating a fifth specific example.
Fig.6 (a) is typical sectional drawing, The cross section along the AA line represented to Fig.1 (a) is represented by the one part. FIG. 6B shows a schematic cross-sectional view along the line AA shown in FIG.

In the bath lid 160 according to the fifth specific example, the columnar member 50 is provided inside the heat insulating member 30D of the bath lid 150 according to the fourth specific example.
The columnar member 50 extends in the thickness direction of the heat insulating member 30D. A plurality of columnar members 50 are provided on the heat insulating member 30D. The compressive strength of the columnar member 50 is greater than the compressive strength of the resin bag. The plurality of columnar members 50 are arranged avoiding the position of the air bag 36. For example, the columnar member 50 is provided so as to penetrate the heat insulating member 30 </ b> D in the thickness direction and connect the lower surface side member 10 and the aggregate 40.

  By providing such a columnar member 50, the thermal stress applied to the lower surface side member 10 can be transmitted to the upper surface side member 10 and the resin bag body by the columnar member 50 and offset by these compressive stresses. it can. Thereby, the thermal expansion of the lower surface side member 10 can be suppressed, and the deformation of the bath lid 160 due to the heat in the bathtub can be suppressed.

Further, according to the bath lid 160, it is possible to prevent the bath lid 160 from warping due to a temperature difference between the upper and lower surfaces without using a special material, and to achieve light weight and low cost.
In addition, although the heat insulating member 30D is used in the bath lid 160, other heat insulating members 30A, 30B, and 30C are also applicable.

FIG. 7 is a schematic perspective view illustrating a sixth specific example.
Fig.7 (a) is typical sectional drawing, The cross section along the AA line represented to Fig.1 (a) is represented by the part. FIG. 7B shows a schematic cross-sectional view along the line AA shown in FIG.

In the bath lid 170 according to the sixth specific example, the columnar member 50 is provided inside the heat insulating member 30C of the bath lid 140 according to the fifth specific example.
The columnar member 50 extends in the thickness direction of the heat insulating member 30C. A plurality of columnar members 50 are provided on the heat insulating member 30D. The compressive strength of the columnar member 50 is greater than the compressive strength of the resin bag. The plurality of columnar members 50 are provided on each of the upper heat insulating portion 35 above the aggregate 40 and the lower heat insulating portion 36 below the aggregate 40.
The columnar member 50 provided on the upper side of the aggregate 40 is provided so as to penetrate the upper heat insulating portion 31 in the thickness direction and connect the upper surface side member 20 and the aggregate 40, for example. Further, the columnar member 50 provided below the aggregate 40, for example, penetrates the lower heat insulating portion 32 in the thickness direction, and connects the lower surface side member 10 and the aggregate 409. Provided.

  In the bath lid 170, in addition to the effects of the bath lid 140, the columnar member 50 is provided, so that the thermal stress applied to the lower surface side member 10 is transmitted to the upper surface side member 10 and the resin bag body by the columnar member 50. Thus, it can be offset by these compressive stresses. Thereby, the thermal expansion of the lower surface side member 10 can be suppressed, and the deformation of the bath lid due to the heat in the bathtub can be suppressed.

  In the bath lid 110 according to the embodiment, the lower surface side member 10 and the upper surface side member 20 may be used as the skin material. When the lower surface side member 10 and the upper surface side member 20 are used as the skin material, the connecting portion between the lower surface side member 10 and the upper surface side member 20 is joined in a watertight manner. Thereby, the lower surface side member 10 and the upper surface side member 20 become a display material which covers the surface of the bath lid body 100 in a watertight manner, and can impart waterproofness to the bath lid 110.

Here, the heat insulation property of the bath lid 110 according to the embodiment will be described.
In the embodiment, the heat insulating property of the bath lid 110 is represented by a thermal resistance value (R value).
The R value (m ² K / W), which is a thermal resistance value, is a value obtained by dividing the thickness (t) of the member (bath lid) by the thermal conductivity (λ) of the member.
The R value of the bath lid 110 according to the embodiment is 0.22 (m ² K / W) or more, preferably 0.25 (m ² K / W) or more.
Here, an example of the R value is shown.
The R value of an aluminum composite material (composite material in which a resin core is sandwiched between aluminum plates) is 0.15 (m ² K / W) at a thickness of 6 mm.
The R value of the plywood (wood) is 0.16 (m ² K / W) at a thickness of 9 mm.
The R value of the resin shutter bath lid having a hollow layer is 0.17 (m ² K / W) at a thickness of 20 mm.
The upper limit of the R value of the bath lid by resin hollow blow molding is 0.22 (m ² K / W).
Therefore, in order to obtain sufficient heat insulation, the R value of the bath lid 110 according to the embodiment is 0.22 (m ² K / W) or more, preferably 0.25 (m ² K / W) or more. Good.

  As described above, according to the present embodiment, the thermal warp of the bath lid 110 can be suppressed without using a special material. Further, such a device makes it possible to provide a bath lid 110 that is very light and easy to use at low cost.

The embodiment of the present invention has been described above. However, the present invention is not limited to these descriptions. As long as the features of the present invention are provided, those skilled in the art appropriately modified the design of the above-described embodiments are also included in the scope of the present invention.
For example, in the embodiment, the bath lid 110 having a substantially quadrangular outer shape in the plan view is illustrated, but the outer shape of the bath lid 110 is not limited to a substantially square shape, and various shapes corresponding to the opening shape of the bathtub 300 such as a substantially circular shape and a substantially oval shape. It can be made into a shape.
Further, the bath lid 110 may be provided with an exterior (film, coating, antifouling, anti-mold coating, etc.) covering the outside of the bath lid body 100.
Moreover, each element with which each embodiment mentioned above is provided can be combined as long as technically possible, and the combination of these is also included in the scope of the present invention as long as it includes the features of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Lower surface side member, 20 ... Upper surface side member, 30, 30A, 30B, 30C, 30D ... Thermal insulation member, 40 ... Aggregate, 100, 100A, 100B, 100C, 100D ... Bath lid main body, 110, 120, 130, 140, 150, 160, 170 ... bath lid, 300 ... bathtub, 301 ... opening, 302 ... inside bathtub, 310 ... rim, 311 ... top surface, 311r ... curved surface, 320 ... side wall, 330 ... bottom, W ... hot water

Claims (4)

A bath lid placed on top of the bathtub,
A lower surface side member facing the bathtub;
An upper surface side member facing the lower surface side member;
A planar heat insulating member including a resin bag body provided between the upper surface side member and the lower surface side member and having an air layer;
An aggregate that is provided between the heat insulating member and the upper surface side member so as not to come into contact with the lower surface side member, and has a larger bending strength than the upper surface side member and the lower surface side member;
With
The thermal expansion of the lower surface side member when the bath lid is heated with the hot water of the bathtub is smaller than the thermal expansion of the upper surface side member,
In the state where the bath lid is placed on the bathtub, the heat insulating member is disposed in the bathtub below the rim portion of the bathtub, and the aggregate is disposed above the heat insulating member. And a bath lid.   The bath lid according to claim 1, wherein the resin bag body is composed of at least one layer of a bubble cushioning material.   The bath lid according to claim 2, wherein a linear expansion coefficient of a material of the lower surface side member is smaller than a linear expansion coefficient of a material of the upper surface side member. A columnar member provided inside the heat insulating member and extending in a direction perpendicular to the surface of the heat insulating member;
The bath lid according to claim 2, wherein the compressive strength of the columnar member is larger than the compressive strength of the resin bag body.

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