JPH0231014Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a pine core material for beds.More specifically, the invention relates to a pine core material for beds. This invention relates to a bed mat core material that is hard to sink, easy to bend and stretch, comfortable to sleep on, has good air circulation and is hygienic, and is strong and difficult to break even after long-term use. .

[Conventional technology]

In recent years, the functions of beds have been reviewed from the viewpoint of health promotion, geriatric care, etc., and bed mats of various structures have been proposed.

Among these proposals, a semi-rigid plastic foam thick plate with grooves has been proposed as a pine core material for beds (Japanese Utility Model Publication No. 57-24346).
No. 57-27458, 6415-6415, 8248-8248, 11822-11822, 11822, 1982.
-11825, Utility Model No. 57-179440).

[Problem that the invention attempts to solve]

However, although these pine core materials for beds have different characteristics, as shown in FIG. The portion held between the grooves 12b has a thin wall, and if it is repeatedly bent due to long-term use, there is a problem that this thin wall portion will break.

[Means for solving problems]

The present invention has been made to solve the above problems.

That is, according to the present invention, a large number of parallel deep grooves are provided on the surface of a thermoplastic resin foamed thick plate, and a large number of shallow grooves are provided perpendicular to the deep grooves, and a large number of shallow grooves are provided on the back side of the thick plate that are parallel to the deep grooves on the front side. Deep grooves are provided at positions where the front and back sides are asymmetrical, shallow grooves are provided at positions parallel to the shallow grooves on the front side, and air circulation holes are provided that penetrate the thick plate from the bottom of the deep grooves on one side to the bottom of the shallow grooves on the other side. A pine core material for a bed is provided, which is characterized by having a large number of perforated holes.

[Effect]

The reason why the deep grooves 2a and 2b in the present invention are provided at asymmetrical positions on the front and back, giving the thick plate 1 a so-called wave-like shape is that the deep grooves 2a and 2b are provided in asymmetrical positions, so that the thick plate 1 has a shape close to a waveform. , 2b serves to enhance the flexibility of the thick plate 1 in the orthogonal direction.

In addition, the shallow grooves 3a and 3b in the present invention, together with the deep grooves 2a and 2b, divide the front and back surfaces of the thick plate 1 into squares, and reduce the load applied to the front and back surfaces of the thick plate 1. Instead of supporting the entire back surface, each convex support portion 7 formed by this section is supported, and the thick plate 1 is provided with flexibility in a direction perpendicular to the shallow grooves 3a, 3b.

Furthermore, the air circulation holes 4 in the present invention are provided in the thick plate 1.
It functions to maintain air circulation between the front and back surfaces. In particular, the reason why the air circulation holes 4 are drilled from the bottom of the deep grooves 2a or 2b on one side of the plank 1 to the bottom of the shallow grooves 3b or 3a on the other side is because a person is lying supine on the plank 1. This enables the above-mentioned air circulation to be maintained without being blocked even when

〔Example〕

Next, the present invention will be explained with reference to embodiments shown in the drawings.

FIG. 1A is a plan view of a pine core material for a bed according to the present invention, FIG. 1B is a front view thereof, and FIG. 1C is a side view thereof.

In Fig. 1, 1 is a thermoplastic resin foam thick plate, 2a is a deep groove on the surface side of the thick plate 1, and 2b is a thick plate 1.
3a is a deep groove on the back side of plate 1, and 3a is a shallow groove on the front side of thick plate 1.
3b is a shallow groove on the back side of the thick plate 1.

Thermoplastic resin foams include polyethylene resin foams (ethylene homopolymers or crosslinked or non-crosslinked ethylene copolymers obtained by copolymerizing ethylene with a small amount of comonomer), polypropylene Polyolefin resin foams such as polypropylene resin foams (propylene homopolymers or polypropylene copolymer foams obtained by copolymerizing propylene with a small amount of comonomer), polystyrene resin foams, etc. .

Among these, polyolefin resin foams are preferred because of their excellent toughness.

Deep grooves 2a and shallow grooves 3 provided on the surface side of the thick plate 1
It is made perpendicular to a. Further, the deep grooves 2b on the back side of the thick plate 1 are parallel to the deep grooves 2a on the front side, and are provided at positions that are asymmetrical between the front and back sides. In the embodiment shown in FIG. 1, the deep grooves 2b on the back side are provided at symmetrical positions between the front and back sides of the center between the adjacent deep grooves 2a, 2a on the front side. That is, if the unevenness formed by the deep grooves is regarded as a waveform, as is clear from FIG. There is a degree phase shift. Since the deep grooves are provided in positions where the front and back sides are asymmetrical, the thickness of the thick plate 1
There is no place where the wall thickness is extremely thin, so it is difficult to break due to bending force.

Further, the shallow grooves 3b on the back side of the thick plate 1 are provided at positions parallel to the shallow grooves 3a on the front side. In the embodiment shown in FIG. 1, the shallow grooves 3b on the back side are provided at asymmetrical positions between the front and back sides of the center between the adjacent shallow grooves 3a on the front side. In other words, if we consider the unevenness formed by the shallow grooves as a waveform, the first
As is clear from FIG. 3C, there is a phase shift of 90 degrees between the front side cross-sectional waveform with the shallow grooves 3a and the back side cross-sectional waveform with the shallow grooves 3b. In the embodiment shown in FIG. 1, the shallow grooves are provided so that they are out of phase by 90 degrees, but the shallow grooves 3a and 3b do not necessarily have to be out of phase, and may be located at symmetrical positions on the front and back.

Further, in FIG. 1, a large number of air circulation holes 4 penetrating the thick plate 1 are provided over the entire surface of the thick plate at intertwining positions of the deep grooves 2a on the front side and the shallow grooves 3a on the back side. These air circulation holes 4 improve air circulation between the front and back sides of the bed mat, and even if a person on the bed sweats, moisture escapes from the air circulation holes 4 to the back side of the bed, keeping the bed dry. It can be hygienic.

FIG. 2 shows an embodiment of the pine core material for a bed according to the present invention. Further, FIG. 3 shows a sectional view taken along the line XX in FIG. 2, and FIG. 4 shows a sectional view taken along the line YY in FIG. 2.

In the core material shown in FIGS. 2 to 4, the deep grooves are tapered so that the width becomes narrower toward the center of the thick plate 1, and the corner portions 5 of the deep grooves are rounded. R) is attached. Further, the corner portion 6 of the shallow groove is also rounded. Further, it is preferable that the air circulation holes 4 are tapered from the front surface to the back surface, or from the back surface to the front surface. If the grooves or air circulation holes are tapered in this way, mold release can be easily performed when the expandable particles are molded by in-mold foam molding, which is preferable. Furthermore, by rounding the corners of the deep grooves and shallow grooves, damage from the deep grooves or shallow grooves can be minimized.

To construct a bed mat using the bed pine core material of the present invention, the bed should be arranged so that the deep grooves are parallel to the periphery extending in the width direction of the bed, and the shallow grooves are parallel to the periphery extending in the longitudinal direction of the bed. do. By doing so, it becomes easier to bend in the longitudinal direction.

By providing deep grooves and shallow grooves, a large number of convex support portions 7 with flat ends are formed asymmetrically on the front and back, which reduces the body support area and reduces the apparent compression hardness of the thermoplastic resin foam. As a result, appropriate cushioning properties are provided.

In the embodiments shown in FIGS. 1 to 4, both the deep groove and the shallow groove are continuous grooves that cross both ends of the thick plate, but the deep groove is provided as a continuous groove that crosses both ends of the thick plate, and the shallow groove is Another embodiment of the present invention is an interrupted groove interrupted by a shaped support portion 7. In this case, the groove portion formed by the deep groove and the shallow groove has a checkerboard pattern as shown in FIG.

Further, the distance between the deep grooves or the shallow grooves can be selected from various values, and accordingly, the shape of the end of the convex support portion can also take various shapes from square to rectangular.

It is also possible to provide deep grooves and shallow grooves so that convex support portions 7 of different areas are arranged in different parts of one bed pine core. In that case, the central supine area 8, which receives the body's gravity more strongly, and the edge part 9, which receives stronger force when going up and down the bed,
It is preferable that the convex support portions 7 are arranged densely so that support can be provided over a large support area.

Further, the thickness of the thick plate 1 is preferably 15 to 70 mm. If it is within this range, flexibility and compressive hardness are maintained at appropriate levels, which is preferable.

The shortest distance d between the deep groove 2a on the surface side and the adjacent deep groove 2b shown in FIG. 3 is preferably 15 to 50 mm. If it is less than 15 mm, the strength is low and there is a problem, and if it exceeds 50 mm, the flexibility is poor and undesirable.

Also, the depth ratio of deep groove/shallow groove is 20/10 to 50/10.
is preferable, and 25/10 to 45/10 is more preferable. The ratio of deep groove depth/total thickness of the plate is preferably 20/80 to 40/60, more preferably 25/75 to 35/65.

The size of the cross-sectional area of the air circulation holes 4 influences the air circulation and the flexibility of the core material. The larger the holes, the greater the flexibility and air circulation. In the case of a circular shape, the diameter of the air circulation hole 4 is preferably 5 to 40 mm, and it is preferable that the air circulation hole 4 is provided in a proportion of 5 to 50% of the total area of the core material. Furthermore, the flexibility of the core material differs depending on where the air circulation holes 4 are provided.
The air circulation holes 4 are preferably provided at the bottoms of the deep grooves in terms of improved flexibility and breathability, and are preferably provided so as to penetrate from the bottoms of the deep grooves on one side to the bottoms of the shallow grooves on the other side.

It is preferable that the average cell diameter of the thermoplastic resin foam is 1 mm or less because it has high strength and is difficult to tear from the grooves. More preferably, it is 0.5 mm or less. Further, the lower limit of the average bubble diameter is 0.001 mm.

The core material of the present invention may be manufactured by processing a thick extruded foam obtained by extrusion using an electric heating blade, or by in-mold foaming of expandable thermoplastic resin particles. It may also be manufactured by molding.

Manufacturing by an in-mold foam molding method is preferable because a strong skin layer is formed on the surface of the foam molded product.
In the case of manufacturing by an in-mold foam molding method, it is preferable that the foam particles are closely fused to each other near the surface layer of the foam, including the skin layer. The foamed particles must be fused inside the foam (within 3 mm from the surface layer), but it is preferable for some voids to coexist between the particles in order to impart flexibility and cushioning properties. In terms of numerical values, it is preferable that the degree of fusion be such that one void exists in a mass of 3 to 400 expanded particles.

The density of the foam is preferably 15 to 40 kg/m ³ in order to balance compressive strength with flexibility and cushioning properties. More preferred is a foam density of 20-35 Kg/ ^m3 .

In order to increase the strength of the central supine part 8 and edge part 9, which are easily subjected to force and require high strength, it is necessary to increase the support area by increasing the density of the convex support parts 7 as described above. In the case of in-mold foaming of expandable particles, in order to achieve tighter fusion of the foam in areas where strength is required, a larger amount of heat is supplied to the corresponding area of the mold than to other areas (specifically, A preferred method is to increase the amount of steam supplied from the mold to the corresponding part.

In addition, the bed pine core material according to the present invention can be used in plural pieces for one bed pine.
It may also be in a divided form. When dividing, 2 to 3 divisions are preferred. In case of splitting,
The benefit is that foam molding is easier because the size of the molded part is smaller.

When constructing a bed mat using the core material of the present invention, as shown in FIG.
It is preferable to provide 1.

[Effect of idea]

The present invention is as explained above, and has the following effects.

(1) It has a shape similar to a waveform, and there are no extremely thin parts, so it has excellent strength and can withstand long-term use.

(2) Since the load is supported by each of the convex support portions 7, the cushioning properties are better than when the entire surface is supported. However, this convex support part 7 is not formed only by the deep grooves 2a and 2b, but its two opposing sides are formed by shallow grooves 3a and 3b, and the convex support part 7 Since compression deformation beyond the depth of the shallow grooves 3a and 3b is suppressed, the cushioning properties do not become excessive.

In addition, this core material is used with the vertical direction perpendicular to the deep grooves 2a and 2b, and this direction has relatively high flexibility due to the deep grooves 2a and 2b, and is suitable for the legs, waist, and back of the human body. However, in the horizontal direction, which is the direction perpendicular to the shallow grooves 3a and 3b, the flexibility is provided by the shallow grooves 3a and 3b, so the flexibility is less than in the vertical direction. It is being Therefore, as mentioned above, the cushioning properties are moderately suppressed and this moderate rigidity in the lateral direction prevents the body from sinking too much, and changes in body position (particularly in the lower back and knees) due to turning over in bed are prevented. It's easy to sleep on, and this, combined with the vertical fit, provides a very comfortable sleeping experience.

(3) Air circulation holes 4 allow good air circulation between the front and back of the bed, allowing moisture to escape easily.
It is hygienic because it keeps the Japanese pine in a dry state. In particular, even if a material with open cells such as foamed polyurethane is used, it is difficult for natural moisture to scatter, and moisture mainly scatters when compressed when a person stands on it. It is important for the removal of this moisture that the air circulation holes 4 are opened at positions where they are unlikely to be blocked.

[Brief explanation of the drawing]

FIG. 1A is a plan view showing an embodiment of the pine core material for a bed according to the present invention, FIG. 1B is a front view, and FIG. 1C is a side view. Fig. 2 is a partially enlarged plan view showing the embodiment, Fig. 3 is a sectional view taken along line XX in Fig. 2, Fig. 4 is a sectional view taken along YY in Fig. 2, and Fig. 5 shows grooves in a checkered pattern. FIG. 6 is an explanatory diagram showing a bent state of a bed mat using the core material of the present invention, and FIG. 7 is a sectional view of a conventional bed mat core material. 1... Thermoplastic resin foam thick plate, 2a... Deep grooves on the front side, 2b... Deep grooves on the back side, 3a... Shallow grooves on the front side, 3b... Shallow grooves on the back side, 4... Air circulation Hole, 5...Corner part of deep groove, 6... Corner part of shallow groove, 7... Convex support part, 8... Central supine part, 9... Edge, 10... Outer cover, 11... Cushion Layer, 12a, 12b...Groove portion.

Claims (1)

[Scope of utility model registration request] A large number of parallel deep grooves are provided on the surface of the thermoplastic resin foam thick plate, and a large number of shallow grooves are provided perpendicular to the deep grooves, and positions on the back surface of the thick plate are parallel to the deep grooves on the front side and are asymmetrical between the front and back. In addition to providing deep grooves in the plate, shallow grooves are also provided in positions parallel to the shallow grooves on the surface side, and numerous air circulation holes are drilled through the thick plate from the bottom of the deep grooves on one side to the bottom of the shallow grooves on the other side. A pine core material for beds that is characterized by its soft texture.