JP4312181B2 - Insulated bath lid - Google Patents

Description

  The present invention relates to a bath lid that is applied to the upper surface of a bathtub for the purpose of keeping warm of the bath water, and more particularly to a flat-type bath lid that is used in a combination of one or more.

Conventionally, as this type of flat type bath lid, as shown in Patent Documents 1 to 4, aluminum plates (aluminum alloy) having a thickness of about 0.15 to 0.20 mm are formed on both upper and lower surfaces of a core plate made of a synthetic resin foam. In many cases, a lid body is composed of a laminated plate obtained by laminating and integrating metal thin plates (including a plate), and a synthetic resin edge protector is attached to the peripheral edge thereof.
JP-A-8-103389 Registered Utility Model No. 3002474 Japanese Utility Model Publication No. 2-82987 Patent 3590344 gazette In recent years, as a bathtub, what is called a heat insulation bathtub which imparted a high degree of heat insulation to a tank wall tends to be widely adopted. There is a demand for a heat insulating bath lid having a higher level of heat insulating performance than conventional products.

However, in the case of a bath lid using a laminated board having a foam insulation layer sandwiched between the conventional ones as shown in the above-mentioned Patent Documents 1 to 4, it can still give sufficient satisfaction to the expected insulation performance. It wasn't. That is, although a core plate made of a resin foam functioning as a heat insulating layer is sandwiched in between, the core plate can use a foam with a very high magnification from the viewpoint of maintaining the strength of the bath lid. However, only a foam having a thickness of 3 to 4 mm with a foaming degree of 1.5 to 2.0 times is used, and the heat insulation performance is still insufficient.

  Thus, it is conceivable to increase the thickness of the heat insulating core plate, but simply increasing the thickness is inconvenient to handle due to an increase in weight. In addition, it may be possible to reduce the weight by increasing the expansion ratio of the core plate. In that case, in addition to the decrease in strength, it is difficult to firmly attach the edge protector, and it is fixed by fixing means such as adhesion. However, there is a problem that it becomes easily detached during handling. Therefore, as proposed in Patent Document 4, it is also considered to adopt a technique in which the edge protector is firmly fixed to the peripheral edge of the lid body by injection molding at the same time as molding, but in this case, an intermediate foam core is used. Since the plate is thick, the molding resin melts and erodes the foam core plate at the time of injection molding of the edge protector, and the core plate is damaged, so that a good formation cannot be performed.

  The present invention is a heat insulating bath lid having a high degree of heat insulating performance under the background of the above-described prior art, which is excellent in strength, durability and convenience of handling, and can be manufactured relatively easily. The purpose is to provide.

  The present invention provides the following means for solving the above problems.

[1] A lid body is composed of a heat insulating laminated plate having a thickness of 10 to 20 mm in which a hard surface plate is laminated on both upper and lower surfaces of a lightweight heat insulating plate made of a synthetic resin foam having a thickness of 8 to 18 mm and a specific gravity of 0.5 or less,
A crushing flat part crushed to a thickness of ½ or less of the thickness of the heat insulating laminate is formed on the peripheral part of the lid body,
An insulating bath lid, wherein an edge protector is integrally formed with a lid body by injection molding on a peripheral portion of the lid body including the crushing flat portion.

  [2] The heat insulating bath lid according to claim 1, wherein the crushing flat portion is crushed and flattened to a thickness of 1/3 or less of the thickness of the heat insulating laminate.

  [3] At least one surface plate of the upper and lower hard surface plates is made of a laminate for a surface plate in which aluminum thin plates are laminated on both surfaces of a core plate made of a 1.5 to 2.0 times foamed synthetic resin foam. The heat insulation bath lid according to claim 1 or 2.

  [4] The heat insulation bath lid according to claim 1 or 2, wherein the upper and lower hard surface plates are made of an aluminum plate or a hard synthetic resin plate.

  [5] The heat insulation according to any one of claims 1 to 4, wherein a curled curled portion is formed in the crushing flat portion, and the edge protector is integrally formed with the bath lid main body in a form in which the curled portion is contained. Bath lid.

  In the bath lid according to the present invention, a hard surface plate is arranged on both upper and lower surfaces, and a lightweight heat insulating plate made of a synthetic resin foam having a high foaming ratio and a large thickness is sandwiched between them, and the overall thickness A plate-shaped lid body is formed of a heat-insulating laminated plate having a thickness of 10 to 20 mm. Accordingly, it is possible to provide a heat insulating bath lid that has high heat insulation properties, is relatively light in weight, and does not have an excessively bulky thickness within a range of 10 to 20 mm, and has excellent handling convenience.

  In addition, a crushing flat part having a thickness of 1/2 or less, preferably 1/3 or less of the thickness of the heat-insulating laminate is formed at the peripheral part, and in a mode of covering the crushing flat part, Since the edge protector is integrally formed by injection molding, when the edge protector is injection molded, the molten resin for molding melts from the end face into the highly foamed lightweight insulation board on the lid body side. Erosion or erosion can be effectively suppressed. That is, as a result of increasing the density of the highly foamed lightweight heat insulating material in the crushing flat part, even if the molten resin contacts the lightweight heat insulating plate from the end surface side of the lid main body, only at the end surface surface portion of the localized heat insulating plate It is possible to prevent the occurrence of a situation in which it becomes difficult to mold the edge protector by being melted into the heat insulating material by being mixed with the molten resin of the edge protector, or being integrated or press-fitted. Rather, the edge protector can be molded in a firmly fixed state to the lid body, which is firmly joined and integrated with the heat insulating material.

  Further, when at least one surface plate of the upper and lower hard surface plates is composed of a laminate for a surface plate having the above-described configuration, the heat insulating effect by the core material of the surface plate, and the intermediate portion By the double heat insulation and the triple heat insulation with the heat insulation effect by the highly foamed lightweight heat insulation plate, it is possible to provide a heat insulation bath lid with further excellent heat insulation performance. Further, due to the excellent strength of the laminate for a surface plate itself, it can be made excellent in bending strength and the surface can be hardly damaged.

  Further, when the upper and lower hard surface plates are made of aluminum plates or hard synthetic resin plates, it is easy to manufacture due to the simplification of the structure, and it is possible to provide a relatively inexpensive heat insulating bath lid.

  Furthermore, when a curled part is formed on the flattened flat part of the peripheral part of the lid body, and this is covered with an edge protector, it is in the lightweight insulation plate layer of the lid body at the time of injection molding of the edge protector. Since the molding resin can be reliably prevented from entering, the process management at the time of injection molding becomes easy, which is advantageous in production. In addition, the bending strength of the lid main body can be improved by the presence of the curled portion, and the strength can be further improved, and the edge protector can be prevented from being detached.

  Next, the heat insulation bath lid according to the present invention will be described in more detail based on the illustrated embodiment.

  1 to 3 show a first embodiment of the present invention.

  The bath lid of the illustrated embodiment includes a lid body (1) having a substantially flat plate shape and a frame-shaped edge protector (2) provided along the periphery thereof.

  The lid body (1) has a thickness of 10 to 18 mm, and a hard heat insulating plate (4) (5) laminated on both upper and lower surfaces of a lightweight heat insulating plate (3) made of a synthetic resin foam having a specific gravity of 0.5 or less. It consists of a heat insulating laminate of ~ 20mm.

  The said lightweight heat insulation board (3) consists of a synthetic resin high foam of 5-10 times foaming, such as polyethylene, a polypropylene, a polystyrene, a polyurethane. Even if it is a case by any material, in order to ensure the favorable heat insulation and lightweight property of a lid | cover main body (1), the specific gravity of a lightweight heat insulation board (3) is 0.5 or less, Preferably it is 0.3 or less, More preferably, 0.2 or less is used. As a specific example, for example, a polyethylene foam having a 6-fold expansion and a specific gravity of about 0.15 can be suitably used.

  By using a high foam of thickness and specific gravity as described above for the lightweight heat insulating plate (3), good heat insulation and light weight can be ensured.

The upper and lower hard surface plates (4) and (5) are the same as the lid body constituent members of the conventional flat bath lid, and the thermoplastic synthetic resin foam is used as the core plates (4a) and (5a). Metal plates (4b) (4c), (5b) (5c) such as aluminum plates having a thickness of 0.15 to 0.3 mm on both upper and lower surfaces
Are laminated plates for surface plate that are joined and integrated.

  The core plates (4a) and (5a) made of the foam are made of a synthetic resin foam having a foaming ratio of about 1.5 to 2.0 times made of a thermoplastic resin such as polyethylene resin or polypropylene resin. The thickness is about 1.0 to 4.0 mm.

  By using the laminate for a surface plate as described above, the foam core plates (4a) and (5a) and the intermediate lightweight insulation plate (1) are given sufficient bending strength to the entire lid body (1). With 3), a high degree of heat insulation can be imparted to the lid body (1).

  The crushing flat part (6) is formed in the peripheral part of a cover main body (1) over the perimeter. As shown in FIG. 3 (a), the crushing flat portion (6) is formed by superposing the hard surface plates (4) and (5) on the upper and lower surfaces of the lightweight heat insulating plate (3) and bonding them together to insulate them. After forming the laminated plate, as shown in FIG. 5 (b), if the peripheral part is required by a pressure tool (7) (8) such as a press roller, it is formed by crushing under heating. .

  As will be described later, the crushing flat portion (6) is formed of a 5-10 times higher foam when the edge protector (2) is formed on the peripheral edge of the lid body (1) by injection molding. When the end face of the lightweight heat insulating plate (3) is exposed as it is, when the molten resin for molding of the edge protector (2) is injected into the cavity of the mold, the above influence is caused by the inflow pressure and temperature of the resin. This is to prevent the occurrence of a situation in which the lightweight heat insulating plate (3) is eroded from the exposed end face side and enters the inside of the heat insulating laminated plate to make it difficult to form the edge protector (2).

  Therefore, the crushing flat part (6) needs to reduce the thickness of the lightweight heat insulating plate (3) until it becomes a high-density resin layer that can prevent the above-mentioned erosion. Crushing and flattening until the thickness is ½ or less, preferably １ ／ or less. Of course, it is possible to completely flatten until the bubbles in the lightweight foam plate (3) disappear almost completely. The foam core plates (4a) and (5a) of the upper and lower hard surface plates (4) and (5) are also crushed to some extent to reduce their thickness, but the layers of these core plates are of the original thickness. Even if the thickness is almost maintained, there is no risk that the edge protector (2) will be greatly eroded when the edge protector (2) is injection molded because the thickness of itself is as thin as about 1 to 4 mm.

  An edge protector (2) is provided along the periphery of the lid body (1) made of the hollow panel.

  The edge protector (2) is molded from a thermoplastic synthetic resin that is compatible with the thermoplastic synthetic resin constituting the core plates (4a) and (5a) of the hard surface plates (4) and (5) of the lid body (1). Has been. That is, for example, for the polyethylene resin core plates (4a) and (5a), an edge protector (2) made of a polyethylene resin or an olefin-based thermoplastic elastomer is used, and a polypropylene resin core plate (4a) (5a). ), An edge protector (2) made from a polypropylene resin or an olefin-based thermoplastic elastomer is employed. Further, as shown in FIG. 2, the edge protector (2) is formed in a substantially U-shape having a groove (9) on the lid main body (1) side in a cross-sectional view. The cover flat body (1) is integrally formed so as to cover the entire crushing flat part (6).

  That is, the edge protector (2) is directly and integrally formed by injection molding so that the periphery of the lid body (1) is fitted into the groove (9) over the entire periphery of the lid body (1). Is done. That is, first, as shown in FIG. 3C, the lid body (1) is positioned and inserted between the upper and lower molds (10) and (11) formed along the periphery of the lid body (1). . Next, the upper and lower molds (10) and (11) are completely closed and the thermoplastic synthetic resin melted in the closed state is injected. The molten resin passes from the sprue (not shown) through the runner, fills the cavity (13) through the gate (12). Thereafter, it is cooled and ejected from the mold to complete the molding. In these series of processes, the inner surface of the edge that is the bottom surface of the groove (9) of the edge protector (2) and the end surfaces of the core plates (4a) and (5a) of the lid main body (1) are welded and integrated. Further, a surface decorative layer (not shown) made of a resin compatible with the edge protector (2) is formed on the outer surface of the metal thin plates (4b) (5b) on the outer surface side of the hard surface plates (4) (5). The peripheral portion corresponding to the edge protector (2) of the surface decorative layer is also welded to the side surface of the groove (9) of the edge protector (2). The molds (10) and (11) are a combination of a plurality of parts in the circumferential direction of the lid body (1), and by removing some of these parts or replacing them with different length parts, It can be adapted to cover bodies of various sizes.

  In addition, it is desirable that the edge protector (2) is formed of a material having a large slip resistance from the viewpoint of preventing the bath lid from slipping when the bath lid is placed on the bathtub. It is desirable to use a soft polyethylene resin.

  According to the bath lid with the edge protector, the edge protector (2) is thermoplastic having compatibility with the thermoplastic synthetic resin constituting the core plates (4a) and (5a) of the hard surface plates (4) and (5). It is made of synthetic resin and formed integrally with the periphery of the lid body (1) by injection molding, and the edge inner surface of the edge protector (2) and the end surfaces of the core plates (4a) (5a) are welded in the formation process. Therefore, the edge protector (2) can be formed and fixed to the lid body (1) at a stroke, and the bath lid with the edge protector can be reasonably manufactured. That is, the productivity of the bath lid with the edge protector can be improved. In addition, since the edge inner surface of the edge protector (2) and the end surface of the core plate (4a) (5a) are welded and integrated, the edge protector (2) is firmly fixed to the periphery of the lid body (1). Even when a large external force is applied unintentionally, it does not come off from the lid body (1).

  Further, when a surface decorative layer made of a thermoplastic synthetic resin compatible with the thermoplastic synthetic resin constituting the edge protector (2) is formed on the outer surface of the hard surface plate (4) (5), The edge protector (2) is welded and integrated not only with the end faces of the core plates (4a) and (5a) but also with the peripheral edges of the hard surface plates (4) and (5), and can be fixed more firmly. (1) The end face can be watertight.

  The lightweight heat insulating plate (3) of the intermediate layer of the lid body (1) is also formed of a resin foam compatible with the resin of the edge protector (2), if necessary, and is a flat and lightweight lightweight heat insulating plate (3 ) May be welded and integrated with the edge protector (2).

  FIG. 4 shows a second embodiment of the present invention.

  In the bath lid in this embodiment, the upper and lower hard surface plates (13) and (14) of the lid body (11) are each composed of an aluminum plate or a hard synthetic resin plate having a thickness of about 0.8 to 1.2 mm. Is.

  Then, as shown in FIG. 4 (a), a heat insulating laminate is formed by sandwiching a lightweight heat insulating plate (3) made of a synthetic resin high foam between these hard surface plates (13) and (14), and its peripheral portion. The lightweight heat insulating plate (3) is crushed until it is completely crushed, and a thick plate-like lid body (11) having a crushing flat portion (16) having a reduced thickness on the entire circumference is formed. Has been.

  Other configurations and the like are the same as in the case of the first embodiment.

  FIG. 5 shows a modification of the bath lid of FIG.

  In the bath lid of this modification, a sealed curled portion (17) is formed by curling a flattened flat portion (16) at the periphery of the lid main body (11). The edge protector (2) is injection-molded so that the curled portion (17) is contained.

  In the case of the bath lid according to this modified example, the presence of the curled portion (17) on the periphery of the lid body (11) increases the bending strength of the lid body (11), and also the edge protector (2). The attachment strength is increased, and there is no risk of unintentional disengagement.

It is a perspective view of the bath lid of 1st Embodiment of this invention. It is sectional drawing of the II-II line | wire of FIG. It is sectional drawing which shows the manufacturing process of the bath lid of FIG. The 2nd Embodiment of this invention is shown, FIG. (A) is sectional drawing which shows the structural member of a lid | cover main body, FIG. (B) is sectional drawing of the bath lid of a completion state. It is sectional drawing of the peripheral part which shows the modification of the bath lid of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,11 ... Lid body 2 .... Edge protector 1 .... Lightweight heat insulation board 4, 14 ... Hard surface board on the upper surface side 5, 15 ... Hard surface on the lower surface side Face plate 6, 16 ... Crushing flat part 16 ... Curl part

Claims (5)

The lid body is composed of a heat insulating laminated plate having a thickness of 10 to 20 mm in which a hard surface plate is laminated on both upper and lower surfaces of a lightweight heat insulating plate made of a synthetic resin foam having a thickness of 8 to 18 mm and a specific gravity of 0.5 or less,
A crushing flat part crushed to a thickness of ½ or less of the thickness of the heat insulating laminate is formed on the peripheral part of the lid body,
An insulating bath lid, wherein an edge protector is integrally formed with a lid body by injection molding on a peripheral portion of the lid body including the crushing flat portion. The heat insulation bath lid according to claim 1, wherein the crushing flat part is flattened to a thickness of 1/3 or less of the thickness of the heat insulating laminate. The at least one surface plate of the upper and lower hard surface plates comprises a laminate for a surface plate in which aluminum thin plates are laminated on both surfaces of a core plate made of a synthetic resin foam foamed 1.5 to 2.0 times. Or the heat insulation bath lid of 2. The heat insulation bath lid according to claim 1 or 2, wherein the upper and lower hard surface plates are made of an aluminum plate or a hard synthetic resin plate. The heat insulating bath lid according to any one of claims 1 to 4, wherein a curled curled portion is formed in the flattened flat portion, and the edge protector is integrally formed with the bath lid main body in a form in which the curled portion is contained.

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