JP3121554U - Three-dimensional lattice gel cushion - Google Patents

Abstract

To provide a three-dimensional lattice gel cushion with improved durability and compressibility.
A cushion 1 in which a plurality of thin-walled partitions 2 made of gel-like resin are elastically arranged side by side in a three-dimensional lattice shape. The cushion 1 includes a thin partition wall 2 that has a uniform thickness and has an inclined surface at a predetermined angle, and a lower wall 3 provided at a lower portion. The portion of the lower wall 3 was arranged in a diagonal line or parallel to this. The cushion 1 has a compressible structure with a soft upper part and a lower part that is difficult to deform, thereby making it possible to maintain a bed and the like that can maintain a better natural body posture than before. .
[Selection] Figure 1

Description

  The present invention relates to a gel-like cushion having a three-dimensional lattice. More specifically, the present invention relates to a three-dimensional lattice gel cushion applied to a nursing bed, a chair, a sofa, etc. mainly used for nursing care.

  A cushion used for a bed or the like is required to have a good sleeping comfort in addition to a function of supporting a human sleeping posture state, and various products to which the cushion is applied have been developed and used. In particular, in the case of a bed for a caregiver, good care for the care recipient is required, and further, a function of preventing bed slippage is also required for a long-time sleeping posture. These required functions include a cushion compressibility, vibration absorption, air permeability, twisting prevention, body pressure dispersion function, etc. in addition to softness, and maintenance of a natural sleeping posture.

Conventionally, the use of a plurality of coil springs, a synthetic resin such as a polyurethane foam, or a sponge has been used to give the bed an effect such as cushioning. Recently, a cushion having a structure in which thin partition walls are juxtaposed in a lattice shape with a gel-like substance related to the present invention has been developed and used. In those examples, various configurations are proposed and known (see, for example, Patent Documents 1 to 4).
JP-T-2001-514912 WO 02/013660 JP 2004-81546 A JP-A-2005-143552

  Conventional lattice cushions are effective as they are, and have been put into practical use. However, there are problems in practical use in practical use, and further improvement effects are demanded, and the current cushion is not always in a satisfactory form. In particular, when applied to a nursing bed, as described above, in order to maintain a natural sleeping posture, further improvements such as an improvement in the shape characteristics of the cushion or an improvement in the manufacture of the cushion are required.

  Current cushions of gel-like substances have drawbacks that tend to be stiff due to their material properties. Therefore, along with the lattice shape, various ideas have been made and various proposals have been made, but there are still imperfections in air permeability, flexibility, toughness, buckling property, compressibility, etc. There is room. In cushioning properties, the effect is limited simply by providing a thin grid-like partition wall. In particular, when applied to a care bed, body pressure dispersion effect, that is, it is required to support the entire body evenly regardless of which part of the body comes into contact.

  In addition to the function of absorbing torsion that does not cause bedsores and friction, the function of ventilating to release moisture generated from the body, such as sweat, and the function of maintaining a sleeping posture that matches the body part are synergistic. A cushioning function that is effective is required. In addition, ease of manufacturing is also required in accordance with these functions. That is, in the technical cushion characteristics, that the compressive stress is constant and that the cushion material is dense are also required in constructing an ideal bed or the like.

  The present invention has been improved based on such a technical background and achieves the following object. That is, an object of the present invention is to provide a three-dimensional lattice gel cushion that has durability and compressibility, excellent body pressure dispersion, good torsion absorption, breathability, etc., and can maintain a natural body posture. . Another object of the present invention is to provide a three-dimensional lattice gel cushion in which the cushion is manufactured by injection molding to be dense and the compression property and the like are improved.

The present invention takes the following means to achieve the object.
The three-dimensional lattice gel-like cushion of the present invention 1 is a thick rectangular cushion which is formed of a thermoplastic elastic body having elasticity and being juxtaposed in a three-dimensional lattice shape and integrally formed by injection molding. Has a thin partition wall that has a slanted surface with a predetermined angle in the thickness direction of the cushion, and is arranged in the three-dimensional lattice arranged in a straight line, and is surrounded by the thin partition wall. The lower surface wall is integrally formed with the thin partition wall at the lower part and is integrally provided with a hole at the center part.

  The three-dimensional lattice gel cushion of the present invention 2 is the three-dimensional lattice gel cushion of the first device, wherein the bottom wall arranged in a straight line is an array provided in a diagonal direction of the rectangular cushion. It is characterized by.

  The three-dimensional grid gel cushion of the present invention 3 is characterized in that, in the three-dimensional grid gel cushion of the present invention 2, the thin partition wall and the bottom wall are joined in an R shape.

  The three-dimensional grid gel cushion of the present invention 4 is the three-dimensional grid gel cushion of the present invention 3, wherein the lower part of the three-dimensional grid surrounded by the thin partition wall other than the bottom wall having the hole is in a through-hole state. It is characterized by becoming.

  The three-dimensional lattice gel cushion of the present invention 5 is the three-dimensional lattice gel cushion of the present invention 3, wherein the lower portion of the three-dimensional lattice surrounded by a thin partition wall other than the bottom wall of the hole is provided with a lattice body. It is characterized by being configured.

  The three-dimensional lattice gel cushion of the present invention 6 is characterized in that, in the three-dimensional lattice gel cushion of the present invention 3, the upper surface of the thin partition constitutes a wavy curved surface that matches the shape of the human body. To do.

  As described in detail above, the three-dimensional lattice gel cushion of the present invention has a compressibility, a structure that removes moisture by a pumping effect, a cushion that is hard to be peeled and maintains a certain hardness, and has excellent durability. became. That is, the compressibility was particularly improved by making the partition wall thickness constant and inclining.

  In addition, a lower wall having a hole in the lower part of the partition wall is arranged on the diagonal of the cushion to partially reinforce the cushion, so that the lower part is relatively strengthened compared to the upper part of the cushion. As a result, the upper surface of the cushion is in a soft state that is easily deformed, and the lower part is a cushion that is less easily deformed than the upper part. In this way, the flexibility and buckling were increased, and it was possible to realize a comfortable bed.

  The embodiment of the three-dimensional lattice gel cushion of the present invention will be described in detail with reference to FIGS. FIG. 1 is a plan view showing a three-dimensional lattice gel cushion of the present invention. The cushion 1 is provided with a square-shaped and thin-walled partition wall 2 in a lattice shape, and a space formed by being surrounded by the partition wall 2 is also a rectangular shape. FIG. 2 is a schematic partial sectional view showing a partial configuration in the cross section of the cushion. This cushion is preferably used for a nursing bed used for nursing care, a medical bed used for medical treatment, a wheelchair, a chair, a sofa, and the like.

  The wall thickness 2 of the partition wall 2 forming the lattice is the same as the wall thickness dimension a of the upper part 2a and the wall thickness dimension b of the lower part 2b, and is constant along the cross section. The upper and lower surfaces of the cushion 1 are parallel to each other, and the cushion 1 has a certain thickness (height), and the partition wall 2 is erected at a predetermined angle α with respect to the surface. . The angles α of the partition walls 2 are alternately different at the same angle along the same arrangement direction.

The cushion 1 is made of a gel-like resin and has a three-dimensional lattice. For example, the cushion 1 is made of a thermoplastic elastic body mainly composed of SEBS (styrene-ethylene-butylene-styrene block copolymer) which is a styrene-based thermoplastic elastic body. Yes. Thermoplastic elastic bodies are rich in flexibility and have good durability. The thermoplastic elastomer has a Shore A hardness of 0.1 to 30, preferably 1 to 15. When an elastomer having this hardness range is used, the partition is buckled when a load is applied, so that there is no feeling of bottoming, and the cushion is soft, has a good cushioning property even with a small load, and has a durable cushion. Using this thermoplastic elastic body, it was molded at a nozzle temperature of 170 to 230 ° C. and an injection pressure of 30 to 80 Mpa (306 to 816 Kg / cm ² ).

  When the weight is applied to the upper portion of the cushion 1, the partition wall 2 is bent and deformed. The thinner the partition wall 2 of the cushion 1 is, the easier it is to bend with respect to the body weight, and the thicker the thickness is, the greater the load against bending is. That is, the stress generated by bending increases. Conventionally, the thickness of the partition wall 2 is such that the upper part 2a is narrowly tapered with respect to the lower part 2b. That is, the upper part 2a was made thin. As a result, the flexibility of the upper portion 2a is relatively improved with respect to the lower portion 2b, and the upper surface of the cushion 1 is made soft. On the other hand, in the present embodiment, as described above, the bottom wall 3 having a configuration in which the partition wall 2 has a constant thickness and is inclined, and the lower wall 2b and the partition wall 2 are integrally joined to the entire periphery. It is intended to be provided.

  A hole 3 a is provided in the lower wall 3 of the section surrounded by the partition wall 2. This is to ensure air permeability. Although this hole 3a is a round hole in the embodiment, it is not limited to this round hole. In the state in which the lower wall 3 is integrated with the entire peripheral partition wall 2, the hole shape may be any shape, such as a square shape or a triangular shape. The joint between the lower wall 3 and the partition wall 2 has an R shape.

  By adopting this R shape, the joint portion is reinforced, the possibility of resin peeling is reduced, and durability is increased. This R shape is also the same at the junction 2c between the partition walls 2. As shown in the drawing, one of the arrangement portions of the lower surface wall 3 of the hole 3a is arranged in a diagonal line A with respect to the quadrangular cushion 1. Further, second array lines B and C are formed in a direction parallel to or crossing the diagonal line A arrangement. With such a configuration, the lower wall 3 is partially disposed on the lower part 2 b of the partition wall 2.

  As a result, the thickness of the partition wall 2 is constant, but the lower portion 2b is strengthened to be hard to be deformed by partially providing the lower surface wall 3 with respect to the upper portion 2a. When weight is applied to the cushion 1 in the sleeping posture and a tensile load is applied in one direction, a compressive load is applied in a direction transverse to the tensile load direction by the reaction force. That is, the cushion undergoes a complex deformation that stretches on the one hand and shrinks on the other hand. By providing the lower surface wall 3 at the lower part of the cushion 1, this deformation is made difficult.

  That is, the upper part of the cushion 1 is soft and the lower part is less deformed than the upper part. Moreover, compressibility is ensured by making the thickness of the partition wall 2 constant. The reason why the lower wall 3 is partially arranged is that air permeability is taken into consideration. The portion without the lower wall 3 is a hole penetrating up and down with the partition wall 2 surface, so that air permeability can be ensured. The air permeability can be secured even in the hole 3a of the lower surface wall 3. However, if the entire surface is made the lower surface wall 3, the air permeability is inevitably inferior to the case where there is not.

  Accordingly, it is possible to secure flexibility and air permeability by installing in a minimum arrangement and making the other sections through holes. The arrangement of the lower wall 3 is considered empirically. As described above, the thickness of the partition wall 2 is constant because the compressibility is ensured in consideration of the upper surface not being too soft. However, the partition wall 2 in this section is inclined to facilitate manufacture. I also consider it.

  Next, molding of the cushion 1 will be described. Conventional molding of the cushion 1 is an injection method. On the other hand, the injection molding method is applied in the present embodiment. In the injection molding, the polymer arrangement is rough and the density is low, the bubbles are generated frequently, and there is a problem in odor adsorbability and the like. In the case of injection molding, since the injection is performed at a high pressure, the polymer array becomes dense and the density is improved. In addition, the generation of bubbles is reduced and odor adsorption is reduced.

  FIG. 3 is a partial cross-sectional view illustratively showing the configuration of an injection mold for molding the cushion 1. The cavity 4 constituting the cushion shape is composed of a fixed mold 5 and a movable mold 6, and a synthetic resin mainly composed of SEBS is injected into the cavity 4 from the fixed mold 5 side through the spool 7 and the gate 8. Although the fixed mold 5 has a two-stage structure, it is for manufacturing, and is considered so that the resin is evenly injected to the lower surface wall 3 side.

  If the synthetic resin is cured after injection, the movable mold 6 is opened and the molded cushion 1 is taken out. In order to facilitate this removal, the partition wall 2 is inclined. This mold is divided at the cushion middle part, and the small mold 9 corresponding to the cushion shape is made into a core form. When the mold is opened, the small mold 9 in the core portion is taken out independently, and one core mold 10 and the other core mold 11 are separated along the partition wall 2 surface of the cushion 1 toward the larger taper. Thus, the cushion 1 that has been smoothly separated and molded can be taken out. The cushion of the present invention is manufactured with the above-described configuration, and is dense and durable. This mold is an example and is not limited to this method. Needless to say, each of the core molds 10 and 11 may be integrated with the fixed mold 5 and the movable mold 6.

  Next, another embodiment will be described. FIG. 4 is a partial plan view of the cushion 1. In this embodiment, the configuration of the lower wall 3 surrounded by the partition wall 2 is the same as that of the above-described embodiment (the lower wall is arranged in a diagonal line A), but a cross-like shape is formed at the lower part of the section other than the lower wall 3. This is an example in which a grid 12 is provided. Providing this lattice body 12 ensures air permeability and at the same time further ensures compressibility. On the lower surface of the cushion 1, the compressibility can be further improved by the synergistic effect of the lower surface wall 3 and the lattice body 12. The joint portion between the lower wall and the partition wall constitutes the R portion as described above, but the joint portion between the partition walls also forms the R portion as shown in the figure.

  FIG. 5 shows a configuration in which the upper surface of the cushion 1 is formed into a wave 13. It can be expected that a more natural body posture can be maintained if a cushion-shaped one having a corrugated shape 13 is prepared in accordance with the body shape. The cushion 1 of this form can be applied not only to a bed but also to a chair. In the case of a chair, the seat surface is shaped to be recessed according to the shape of the buttocks. FIG. 6 is a cushion 1 composed of a wave 14 having small irregularities in the modification of FIG. In the case of this form, when weight is applied to the wavy shape 14 having the uneven surface, a gap is formed in the concave portion, so that there is an effect of improving air permeability.

  As mentioned above, although embodiment of this invention was described, it cannot be overemphasized that this invention is not limited to this embodiment.

  FIG. 7 shows a comparison with the conventional cushion shape related to the present invention, and shows a compressive stress curve due to the difference in the shape of the lattice-shaped partition wall. The pattern A is a shape according to the present invention, and the partition wall thickness is 2.9 mm and the thickness is constant. The pattern B has a conventional shape and has a taper shape in which the thickness of the upper part of the partition wall is 1.68 mm, the thickness of the lower partition wall is 4.12 mm, and the thickness of the middle part is 2.9 mm.

  According to this figure, the compressive stress with respect to each displacement amount (subduction amount) is higher than that in the conventional case (pattern B). On the other hand, it is curve data with stable transition in a form close to constant. As a result, in comparison with the difference in the thickness of the partition walls, the configuration of the present invention is in a state where the compressive stress is constantly increased in the normal sinking amount range of the sleeping posture when applied to the bed as compared with the conventional structure. It was confirmed.

The composition of the thermoplastic elastic body of this example is
SEBS (Clayton G) 100 parts by weight Softener (liquid paraffin) 300 parts by weight Filler (calcium carbonate) 10 parts by weight Antioxidant 0.1 part by weight Clayton G is SEBS of Kraton Polymer.
The molding conditions are: nozzle injection temperature 190 ° C
Injection pressure 70Mpa
It is.

FIG. 1 is a plan view of a three-dimensional lattice gel cushion of the present invention. FIG. 2 is a partial cross-sectional view of the three-dimensional lattice gel cushion of the present invention. FIG. 3 is a partial cross-sectional view of a mold apparatus for manufacturing a three-dimensional lattice gel cushion according to the present invention. FIG. 4 is a partial plan view of a cushion showing another embodiment. FIG. 5 is a side view showing a cushion having a corrugated surface according to another embodiment. FIG. 6 is a side view showing a cushion in which the surface is corrugated in the modified example of FIG. 5 according to another embodiment. FIG. 7 is a data diagram of the compressive stress curve of the gel cushion, showing the result of the difference between the partition wall of the present invention and that of the prior art in the form of a graph showing the relationship between the displacement and the compressive stress.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Cushion 2 ... Partition 3 ... Bottom wall 4 ... Cavity 5 ... Fixed mold 6 ... Movable mold

Claims (6)

It is a rectangular cushion with a thickness that is formed of thermoplastic elastic bodies with elasticity and juxtaposed in a three-dimensional lattice shape and integrated by injection molding,
The three-dimensional lattice has a uniform thickness, and has a thin partition wall that has an inclined surface with a predetermined angle in the thickness direction of the cushion,
It is arranged in the three-dimensional lattice arranged in a straight line, is surrounded by the thin partition wall, and is integrally joined to the thin partition wall at the lower part of the entire periphery, and comprises a bottom wall provided with a hole at the center. Three-dimensional lattice gel cushion characterized by. The three-dimensional lattice gel cushion according to claim 1,
The three-dimensional lattice gel cushion, wherein the lower surface walls arranged in a straight line are arranged in a diagonal direction of the rectangular cushion. The three-dimensional lattice gel cushion according to claim 2,
The thin-walled partition and the bottom wall are joined in an R shape at the joint portion. A solid lattice gel cushion. In the three-dimensional lattice gel cushion according to claim 3,
The three-dimensional lattice gel-like cushion, wherein a lower portion of the three-dimensional lattice surrounded by the thin partition walls other than the bottom wall having the hole portion is in a through-hole state. In the three-dimensional lattice gel cushion according to claim 3,
The lower part of the three-dimensional lattice surrounded by a thin partition wall other than the bottom wall of the hole has a configuration in which a lattice body is provided. In the three-dimensional lattice gel cushion according to claim 3,
The three-dimensional lattice gel cushion, wherein the upper surface of the thin partition wall is configured as a wavy curved surface that matches the shape of a human body.

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