JP2004081546A - Cushion and manufacturing method for it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a novel cushion, integrally formed so that thin vertical and horizontal partition walls are arranged into a grid form in a plan view, and having no fear of largely impairing stability of the cushion itself even if the respective partition walls are largely bent. <P>SOLUTION: This cushion 1 is supported by the lower end faces of vertical and horizontal partition walls 1a, 1b and the lower surface of a bulged part 1d formed at the bottom of a part surrounded with the vertical and horizontal partition walls 1a, 1b, whereby the contact area to the cushion placing surface can be enlarged so that even if the load is applied to the respective partition walls 1a, 1b, the cushion 1 itself is not deformed largely. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an elastomeric cushion member that constitutes a cushion such as a chair, a sofa, a bed and the like.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, among cushions used for beds and the like, there is a cushion in which thin-walled partitions made of a semi-hard material are arranged side by side in a substantially lattice shape in a plan view (for example, Japanese Utility Model Laid-Open No. 52-15307). .
In the conventional cushion, when a load is applied from above, a thin-walled partition made of a semi-hard material is inclined to the side to exhibit cushioning properties (cushioning properties). On the other hand, it exhibits a desired cushioning property, but lacks cushioning property for a small load, and there is a problem that the user feels the hardness of the partition wall when the user turns over. In addition, the flexibility is not exerted at the center of the cross-shaped intersection of the partition walls arranged in a grid, and a repulsive force occurs such that the pillar stands up partially, and the user may feel uncomfortable when lying down. Was.
[0003]
On the other hand, the present inventors have previously proposed, as a cushion for solving the above-mentioned disadvantages, an elastomer cushion integrally molded such that elastic thin vertical and horizontal partitions are arranged side by side in a lattice shape in plan view ( Japanese Patent Application No. 2000-244554, Japanese Patent Application No. 2001-181364, etc.).
By forming the above-mentioned partition walls from an elastomer such as a thermoplastic elastomer or rubber, each cushion is appropriately bent when a load is applied, so that there is no feeling of bottoming during use, and an appropriate cushion It is possible to maintain the property for a long time.
[0004]
[Problems to be solved by the invention]
Incidentally, the above-mentioned cushion proposed in the prior art is formed by integrally forming the thin vertical and horizontal partitions 101 having elasticity so as to be juxtaposed in a lattice shape in plan view, and the bottom portion of the portion surrounded by the vertical and horizontal partitions 101. 102 is released, and the cushion 100 and the surface 110 on which the cushion is placed are in contact only at the lower end face 103 of the vertical and horizontal partitions, and since the contact area is small, a load is applied and the respective partitions deflect. At this time, there is a possibility that the stability of the cushion 100 itself may be lost (see FIG. 8).
[0005]
In particular, as proposed by the present inventors in Japanese Patent Application No. 2001-172386 and the like, when a required number of cushions formed into a predetermined size are connected to each other to form a large cushion for a bed, The cushions arranged in the parts where relatively large loads are applied, such as the head, waist, buttocks, etc., may be disconnected from the adjacent cushions because each partition is largely bent.
[0006]
The present invention has been made in view of the above-described conventional circumstances, and the object thereof is to provide a cushion that is integrally formed such that elastic thin-walled vertical and horizontal partitions are arranged side by side in a lattice in plan view. Even if a large load is applied to each partition wall, the stability of the cushion itself does not significantly deteriorate even when the respective partition walls are largely bent, and a new cushion is provided without fear of disconnecting the adjacent cushions. Is to do.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the cushion according to the present invention has a structure in which thin vertical and horizontal partitions having elasticity are arranged side by side in a lattice shape in a plan view, and the outer periphery is surrounded by the partitions. Wherein an overhanging portion is formed at the bottom of a portion surrounded by the vertical and horizontal partitions, from the lower ends of the vertical and horizontal partitions.
[0008]
In this way, by forming the overhang portion at the bottom of the portion surrounded by the vertical and horizontal partitions, the cushion is supported in a state where the lower end surfaces of the vertical and horizontal partitions and the lower surface of the overhang portion are in contact with the cushion mounting surface. Become so. Therefore, as compared with the conventional cushion supported only by the lower end surfaces of the vertical and horizontal partitions, the contact area with respect to the mounting surface is increased, and the stability of the cushion itself when a load is applied and each partition flexes is improved.
[0009]
Here, if only the stability of the cushion itself is to be improved, it is conceivable to greatly increase the contact area by closing the bottom of the portion surrounded by the vertical and horizontal partition walls with a bottom film. May be too large, and the amount of flexural deformation of each partition may be reduced when a load is applied. On the other hand, instead of completely closing the bottom of the portion surrounded by the vertical and horizontal partitions as in the present invention, by providing an overhang, the contact area is appropriately enlarged to improve the stability of the cushion. However, the deformation of the vertical and horizontal partition walls can be maintained at the same level as that of the conventional cushion, and appropriate cushioning properties can be obtained.
[0010]
The overhanging portion can be formed such that one or a plurality of openings having various shapes such as a triangle, a quadrangle, a polygon having a pentagon or more, a circle, an ellipse, etc. are formed in a portion surrounded by vertical and horizontal partitions. Considering that the load stress applied to the overhang is uniformly distributed over the entire area of the overhang so that the stability can be appropriately maintained for a long period of time, as in claim 2, the overhang is Preferably, it is formed so as to surround a circular opening at the center of the bottom of the portion surrounded by the vertical and horizontal partitions.
Further, when the overhanging portion is formed so as to surround a square opening at the center of the bottom of the portion surrounded by the vertical and horizontal partitions, the overhanging portion extends along the lower ends of the vertical and horizontal partitions. And is formed to extend at a uniform width in the vertical or horizontal direction. Therefore, the cushion can be easily contracted in the vertical direction or the horizontal direction, and packing and packing in a contracted state (a folded state) can be performed.
[0011]
Further, as in claim 4, by setting the area of the overhanging portion, in other words, the overhanging dimension from the lower end of the vertical and horizontal partitions, the degree of deflection of the vertical and horizontal partitions can be adjusted to the required rigidity of the cushion. It can be set arbitrarily according to the situation.
That is, when the area of the overhanging portion (overhanging dimension from the lower end of the partition wall) is increased, the degree of deflection of the vertical and horizontal partition walls decreases, a relatively hard cushion can be obtained, and the area of the overhanging portion is reduced. In this case, the degree of deflection of the vertical and horizontal partitions is increased, and a relatively soft cushion can be obtained.
[0012]
As a preferable manufacturing method for obtaining the cushion according to any one of claims 1 to 4, as in claim 5, thin and vertical partition walls having elasticity are arranged side by side in a lattice shape in plan view and the partition walls. An elastomeric cushion base material integrally formed so as to form an outer peripheral surface surrounding the outer periphery and to be closed by a bottom film continuous with a lower end of the vertical and horizontal partition walls at a bottom portion surrounded by the vertical and horizontal partition walls. After that, the bottom film may be punched into a predetermined shape to form a projecting portion extending from the lower ends of the vertical and horizontal partitions at the bottom of the portion surrounded by the vertical and horizontal partitions.
[0013]
By the way, as described above, the cushion member constituting the cushion of the present invention is formed by molding the partition walls with an elastomer, so that each partition wall is appropriately bent when a load is applied, and a feeling of bottoming during use is obtained. This makes it possible to maintain proper cushioning properties over a long period of time.
The elastomer may be a crosslinked rubber (crosslinked rubber) such as a natural rubber or a synthetic rubber, or a thermoplastic elastomer. In order to make it possible to provide a highly durable and durable cushion member with less settling, the cushion member is preferably made of a crosslinked rubber.
[0014]
That is, the cushion member is made of a crosslinked product (crosslinked rubber) of at least one rubber selected from natural rubber and synthetic rubber, and each partition in the cushion member has a hardness of Shore A 20 to 40. It is preferable that
The rubber is preferably a rubber mixture containing 10 to 20% by mass of a polybutadiene rubber. In particular, the rubber is preferably a rubber mixture composed of 40 to 80% by mass of a natural rubber, 10 to 40% by mass of a polyisoprene rubber, and 10 to 20% by mass of a polybutadiene rubber (100% by mass of the three).
Further, it is preferable that a softener is blended in the above-mentioned crosslinked rubber. The softener is preferably a liquid polyisoprene rubber.
Further, it is preferable to add a reinforcing agent to the crosslinked rubber. The reinforcing agent is preferably white carbon.
Further, it is preferable to add a blooming inhibitor to the crosslinked rubber. The blooming inhibitor is preferably a complex ester of a high molecular weight aliphatic carboxylic acid.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, a is a bed cushion having a predetermined size by connecting a required number of cushions 1 by a desired connecting means such as bonding, stapling, and a hook member, and b stores the bed cushion a. It shows a frame of a predetermined size.
[0016]
As shown in FIGS. 2 and 3, the cushion 1 has thin partition walls 1a and 1b having a predetermined height arranged in a horizontal direction and a vertical direction so as to be arranged side by side in a lattice shape in a plan view, and the outer periphery thereof is in the horizontal direction. And an outer peripheral surface 1c surrounded by vertical partition walls 1a and 1b, and each partition wall 1a and 1b is made of an elastomer so as to bend appropriately when a load is applied from above and exhibit a desired cushioning property. It is integrally molded.
[0017]
Further, the cushion 1 has a protrusion 1d formed at the bottom of a portion surrounded by the vertical and horizontal partitions 1a and 1b and continuous with the lower ends of the vertical and horizontal partitions 1a and 1b. With respect to the mounting surface b1, the lower end surfaces of the vertical and horizontal partitions 1a and 1b and the lower surface of the overhang portion 1d are supported in contact with each other. Accordingly, the contact area with the inner bottom surface b1 is enlarged, and the cushion 1 is bent when the load is applied and the respective partition walls 1a, 1b are bent, as compared with the conventional cushion supported only by the lower end surfaces of the vertical and horizontal partition walls 1a, 1b. The stability of itself is improved.
[0018]
Further, in this example, the overhang portion 1d surrounds the circular opening 1e at the center of the bottom of the portion surrounded by the vertical and horizontal partitions 1a and 1b (so that the opening 1e surrounded by the inner peripheral edge of the overhang portion 1d becomes circular). Is formed, whereby the load stress is uniformly dispersed over the entire area of the overhang portion 1d, and the above-mentioned stability can be appropriately maintained for a long period of time.
[0019]
On the other hand, as shown in FIG. 4, the opening 1e 'surrounded by the inner peripheral edge of the overhang portion 1d has a circular shape so as to surround the square opening 1e' at the center of the bottom of the portion surrounded by the vertical and horizontal partitions 1a and 1b. As described above, the overhang portion 1d may be formed. Also in this case, the cushion 1 is supported in a state where the lower end surfaces of the vertical and horizontal partitions 1a, 1b and the lower surface of the overhang portion 1d are in contact with the inner bottom surface b1, and a load is applied to each of the partitions 1a, 1b. The stability of the cushion 1 itself when the 1b is bent is improved. In addition, the overhang portion 1d is formed so as to extend at a uniform width in the vertical or horizontal direction along the lower ends of the vertical and horizontal partitions 1a, 1b, and thus, as shown in FIG. It becomes easy to shrink in the direction, and packing and packing in a shrunk state (folded state) become possible.
[0020]
The area of the overhang portion 1d (overhang dimension from the lower ends of the partition walls 1a and 1b) is arbitrarily set so that the degree of bending of the vertical and horizontal partition walls 1a and 1b according to the required hardness of the cushion 1 can be obtained. .
[0021]
An example of a method for manufacturing the cushion 1 will be described. For example, as shown in FIG. 6, an assembly including a lower mold c1, an upper mold c2, and a mold c3, and a disassembly mold c are assembled. Are filled with an elastomeric material, and the thin vertical and horizontal partitions 1a, 1b having elasticity are arranged side by side in a lattice shape in plan view, and the partition 1a, 1b surrounds the outer periphery to form an outer peripheral surface 1c. The cushion base material 1 'made of elastomer is integrally molded so that the bottom of the portion surrounded by the partitions 1a and 1b is closed by the bottom film 1f continuous with the lower ends of the vertical and horizontal partitions 1a and 1b. As described later, the elastomer used here may be any of a crosslinked rubber (crosslinked rubber) such as natural rubber or synthetic rubber, and a thermoplastic elastomer.
[0022]
After obtaining the cushion base material 1 ', although not shown, the center of each bottom film 1f is punched into a circular or square shape of a predetermined size by a punching die, and around the bottom film 1f, A circular bottom opening 1e or a square bottom opening 1e 'surrounded by the inner peripheral edge of the overhang portion 1d is formed, leaving a continuous overhang portion 1d at the lower ends of the vertical and horizontal partitions 1a, 1b.
[0023]
The cushion 1 made of the thermoplastic elastomer obtained as described above can be used alone as a cushion for a chair or a sofa, but in the present example, it is used as a cushion for a bed. To produce a bed cushion a of a predetermined size such as a single bed size, a semi-double bed size, a double bed size, or the like.
[0024]
The bed cushion a is housed in a bed base having a frame b formed of a wooden board or the like, and the outer peripheral surface 1c of each cushion 1 constituting the outer edge portion of the bed cushion a is appropriately stopped. The bed can be configured by fixing the inner peripheral surface of the frame body b by the attaching means, and further laying a bed pad or covering the bed pad thereon.
The bed cushion a configured in this manner is provided with an overhang portion 1d at the bottom of the portion surrounded by the vertical and horizontal partitions 1a, 1b in each cushion 1, so that a load is applied to the partition 1a, Even if 1b is bent, each cushion 1 itself is stably placed in the frame b. Therefore, even if the partition walls 1a and 1b are greatly bent in the cushion 1, which is located at a position where a relatively large load is applied, such as the user's head, waist, and buttocks, the connection state with the adjacent cushion 1 is disconnected, There is no risk of inversion (see FIG. 7).
Further, the bottom of the portion surrounded by the vertical and horizontal partitions 1a and 1b is not completely closed by the bottom film 1f, but the stability is improved by the overhanging portion 1d which extends over a predetermined dimension. An appropriate cushioning property can be obtained by maintaining the bending deformation of 1a and 1b at the same level as the conventional cushion.
[0025]
Incidentally, the molding dimensions of the partition walls 1a and 1b constituting the cushion 1 described above may be set to, for example, a height of the partition wall of about 30 to 300 mm and a width of about 30 to 100 mm. The thickness of the partition is 0.5 to 5 mm, preferably about 1.0 to 3 mm. When the circular bottom opening 1e is formed, the diameter is preferably 18 to 80 mm. When the square bottom opening 1e 'is formed, the length of one side of the opening 1e' is 18 to 80 mm. It is preferable to set the degree. The overhang dimension of the overhang portion 1d is preferably about 6 to 10 mm.
[0026]
Further, the ratio of the partition wall 1a along the lateral direction (transverse direction) of the bed and the partition wall 1b along the longitudinal direction (longitudinal direction) of the bed is substantially the same, and the lattice shape formed by the partition walls 1a and 1b is substantially the same. It is good to form it in a square shape.
[0027]
Hereinafter, the elastomer used for molding the cushion 1 described above will be described in detail. The elastomer used in the present invention may be any of a thermoplastic elastomer and a crosslinked rubber. Is more preferred.
[0028]
As the raw rubber for the crosslinked rubber used in the present invention, natural rubber and / or synthetic rubber is used. Examples of the synthetic rubber include polybutadiene rubber, polychloroprene rubber, polyisoprene rubber, butadiene styrene rubber, butadiene acrylonitrile rubber, and isobutylene isoprene rubber. In consideration of properties such as hardness (softness) of the cushion 1, prevention of settling, durability, and conformability to deformation, one or more rubbers are mixed and used.
[0029]
As the raw rubber for the crosslinked rubber used in the present invention, a rubber mixture containing a polybutadiene rubber is preferable from the viewpoint of imparting elasticity to the crosslinked rubber. The compounding amount is preferably 10 to 20% by mass of the raw rubber. Particularly preferred raw rubber is a mixture of natural rubber, polyisoprene rubber and polybutadiene rubber, and the preferred compounding ratio is 40 to 80% by mass of natural rubber, 10 to 40% by mass of polyisoprene rubber and 10 to 20% by mass of polybutadiene rubber. (Total of 100% by mass of the three). When these rubbers are molded into a cushion structure, they are vulcanized with a vulcanizing agent to form crosslinked rubber. As the vulcanizing agent, commonly used sulfur and organic sulfur-containing compounds can be used. In the case of vulcanization, it is preferable to use a commonly used vulcanization accelerator, an organic vulcanization acceleration aid and / or an inorganic vulcanization acceleration aid.
[0030]
The crosslinked rubber has a Shore A hardness of 20 to 40, preferably 30 to 40. When the cushion 1 is made of a crosslinked rubber having such a hardness, when a load is applied, the partition walls 1a and 1b bend and deform so as to buckle, there is no feeling of bottoming, and the cushion is flexible and has good cushioning even with a small load. The cushion 1 is obtained. Further, the settling of the cushion 1 relates to the permanent elongation and the compression set of the crosslinked rubber constituting the partition walls 1a and 1b, and the smaller these values, the less the settling. The cushion 1 preferably has a permanent elongation of 5% or less and a compression set of 50% or less (based on JIS K6262).
[0031]
In the present invention, it is preferable to add a softener to the crosslinked rubber. The softening agent is a plasticizer having a reactive site, and the reactive site has a carbon-carbon double bond, a terminal active hydrogen group, a chemically modified reactive functional group, and the like. From that viewpoint, a softening agent having a carbon-carbon double reaction site is preferable. In the present invention, the softener is added for the purpose of imparting softness to the crosslinked rubber and maintaining a predetermined hardness. For this reason, diene-based softeners having a low SP value are preferable, and isoprene-based, butadiene-based, and isoprene-butadiene-based softeners are used, and the molecular weight of these is preferably about 10,000 to 100,000. If the molecular weight is small, unreacted substances bleed, and a sound may be generated when a load is applied to the cushion 1, which may cause sticking. Run out. Preferred molecular weights are between 20,000 and 50,000. The softener is mixed with the raw rubber before crosslinking (vulcanization). The compounding amount of the softening agent is preferably 5 to 20% by mass based on the raw rubber. Examples of the softening agent include Klaprene LIR-30 and Claprene LIR-50 (both are liquid polyisoprene rubbers (trade name) manufactured by Kuraray Co., Ltd.).
[0032]
In the present invention, it is preferable to add a reinforcing agent to the crosslinked rubber. The reinforcing agent improves the settling prevention of the cushion 1 and increases the strength. As the reinforcing agent, magnesium carbonate, calcium carbonate, white carbon, carbon black, clay, or the like is used. In particular, white carbon is preferred from the viewpoint of improving the settling of the crosslinked rubber and improving the strength. The compounding amount is preferably 1 to 20% by mass based on the raw rubber. Further, it is preferable to blend a blooming inhibitor into the crosslinked rubber. As the blooming inhibitor, a complex ester of a high molecular weight aliphatic carboxylic acid is preferred because it prevents blooming, acts as a softener for the crosslinked rubber, and imparts softness to the crosslinked rubber. As the composite ester, for example, “BLOOM STOPPER (Bloom Stopper) -HR” (trade name) manufactured by Shinko Giken Co., Ltd. can be mentioned. The compounding amount is preferably 2 to 10% by mass based on the raw rubber.
[0033]
The cushion 1 made of crosslinked rubber is prepared by compounding a predetermined compounded rubber with a vulcanizing agent, a vulcanization accelerator, and, if necessary, a softening agent, a reinforcing agent, an anti-blooming agent, etc., and kneading the mixture. It is preferable to manufacture by molding by a molding method or an injection molding method and vulcanizing by heating.
[0034]
On the other hand, the thermoplastic elastomer used in the present invention is a substance which behaves as a rubber-like elastic body at room temperature but undergoes plastic deformation due to a rise in temperature. As the thermoplastic elastomer, styrene-based thermoplastic elastomer, polyolefin-based thermoplastic elastomer, polyvinyl chloride-based thermoplastic elastomer, polyester-based thermoplastic elastomer, polyurethane-based thermoplastic elastomer, polyamide-based thermoplastic elastomer, 1,2-polybutadiene-based Examples include thermoplastic elastomers, fluororubber-based thermoplastic elastomers, chlorinated polyethylene-based thermoplastic elastomers, and dynamically crosslinked thermoplastic elastomers.
[0035]
The styrene-based thermoplastic elastomer is a block copolymer using polystyrene as a hard segment in a molecule and polydiene such as polybutadiene or polyisoprene as a soft segment. For example, styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS), styrene-ethylene-butylene-styrene block copolymer (SEBS), styrene-ethylene-propylene-styrene block copolymer (SEPS), etc. And a mixture of a hydrogenated styrene-butadiene block copolymer and polypropylene.
[0036]
In addition, as the polyolefin-based thermoplastic elastomer, EPDM, a mechanical blend (blend type) of an olefin-based rubber such as isobutylene-isoprene rubber and a polyolefin resin, or an olefin-based rubber and a polyolefin resin are kneaded in the presence of an organic peroxide. A blend in which the rubber phase is partially cross-linked (partially cross-linked blend type), a composite in which polypropylene is used as a continuous phase, and cross-linked EPDM is used as a dispersed phase (completely cross-linked blend type), and the like are used.
Examples of the polyvinyl chloride-based thermoplastic elastomer include a blend of polyvinyl chloride and a nitrile rubber or a partially crosslinked nitrile rubber.
[0037]
Examples of the polyester-based thermoplastic elastomer include, for example, polyester-polyether-type elastomer produced by subjecting dimethyl terephthalate, 1,4-butanediol and polytetramethylene ether glycol to a transesterification / polycondensation reaction, dimethyl terephthalate And polyester-polyester type elastomers produced by subjecting 1,4 butanediol and ε-caprolactone to transesterification and ring-opening reaction. Examples of the polyurethane-based thermoplastic elastomer include an elastomer obtained by reacting a long-chain diol having a terminal active hydrogen, a short-chain diol, and diisocyanate to form a hard segment and a soft segment. Examples of the polyamide-based thermoplastic elastomer include, for example, elastomers produced by a ring opening reaction and a condensation reaction using lauryl lactam, dicarboxylic acid, and polyether diol as raw materials.
[0038]
Among these thermoplastic elastomers, styrene-based thermoplastic elastomers, in particular, are rich in flexibility and have good durability, so that a cushion having good characteristics can be formed.
The thermoplastic elastomer used in the present invention has a Shore A hardness of 15 to 40, preferably 15 to 35. When the cushion 1 is made of a thermoplastic elastomer having such a hardness, when a load is applied, the partition walls 1a and 1b bend and deform so as to buckle. Even with good buffering. Furthermore, it is rich in durability.
[0039]
As described above, as the thermoplastic elastomer used in the present invention, styrene-based, polyurethane-based, polyolefin-based, polyvinyl chloride-based, polyester-based, polyamide-based, and the like are used, and a softener such as process oil is added to these thermoplastic elastomers. May be added to adjust the hardness. Depending on the amount of process oil added, there is a possibility that the cushion will stick or sticky, so the amount of oil added is preferably in the range of 0 to 30 parts by weight with respect to 100 parts by weight of the elastomer.
[0040]
As described above, an example of the embodiment of the cushion according to the present invention has been described with reference to the drawings. However, the present invention is not limited to the illustrated example, and the technical idea described in each claim of the claims is provided. It goes without saying that various changes are possible in the category of.
[0041]
【The invention's effect】
The cushion according to the present invention is configured as described above, and has the following effects.
(Claim 1)
The overhanging portion formed at the bottom of the portion surrounded by the vertical and horizontal partitions increases the contact area of the cushion with the mounting surface, thereby improving the stability of the cushion itself when a load is applied and each partition flexes. be able to. Therefore, for example, when a large number of cushions are connected to each other to form a large cushion for a bed, each of the cushions disposed at a portion where a relatively large load is applied, such as a user's head, waist, buttocks, etc. Even if the partition wall is largely bent, there is no fear that the cushion at the site is largely deformed as a whole and the connection with the adjacent cushion is disconnected or inverted. In addition, since the contact area is appropriately enlarged by the overhang portion, the deformation of the vertical and horizontal partition walls can be maintained at the same level as that of the conventional cushion while improving the stability of the cushion itself as described above.
[0042]
(Claim 2)
Since the bottom opening surrounded by the inner peripheral edge of the overhang is circular, the load stress applied to the overhang is evenly distributed over the entire area of the overhang. Therefore, there is no possibility that a crack is formed in the overhang portion or the vertical and horizontal partition walls, and the above-described stability can be maintained for a long time.
[0043]
(Claim 3)
The bottom opening surrounded by the inner peripheral edge of the overhanging portion has a square shape, and the overhanging portion is formed along the lower end of the vertical and horizontal partition walls so as to extend at a uniform width in the vertical or horizontal direction. It becomes easy to shrink in the direction. Therefore, packing and packing in a contracted state (folded state) can be easily performed, and the space for storage and transportation can be reduced.
[0044]
(Claim 4)
By arbitrarily setting the area of the overhang portion, the degree of deflection of the vertical and horizontal partitions can be arbitrarily set according to the required hardness of the cushion.
[0045]
(Claim 5)
After obtaining an elastomer cushion base material integrally molded so that the bottom of the portion surrounded by the vertical and horizontal partitions is closed by the bottom film, the bottom film is punched into a predetermined shape to form an overhang portion. As compared with a method in which the bottom film is cut one by one with a cutter or the like to form a projecting portion having a predetermined shape, a cushion having the above-described effects can be manufactured easily and at low cost.
[Brief description of the drawings]
FIG. 1 is a perspective view, partially omitted, of a bed cushion obtained by connecting a required number of cushions according to the present invention.
FIG. 2 is an enlarged perspective view of a cushion according to the present invention, partially cut away.
FIG. 3 is an enlarged sectional view taken along line (x)-(x) in FIG. 2;
FIG. 4 is an enlarged perspective view of a cushion showing an example in which a bottom opening is square, and is partially cut away.
FIG. 5 is a plan view showing a state where the cushion shown in FIG. 4 is contracted and packed in a box.
FIG. 6 is a perspective view showing an example of a cushion forming method according to the present invention.
FIG. 7 is a sectional view showing a state when a load is applied to the cushion according to the present invention.
FIG. 8 is a sectional view showing a state where a load is applied to a conventional cushion.
[Explanation of symbols]
a: Bed cushion b: Frame body 1: Cushion 1a, 1b: Partition wall 1c: Outer peripheral surface 1d: Overhanging portions 1e, 1e ': Bottom opening 1f: Bottom film c: Mold

Claims (5)

An elastic cushion in which thin vertical and horizontal partitions having elasticity are arranged side by side in a lattice shape in a plan view, and are integrally formed so as to form an outer peripheral surface by surrounding the outer periphery with the partition, and are surrounded by the vertical and horizontal partitions. A cushion, wherein a projecting portion projecting from the lower ends of the vertical and horizontal partitions is formed at the bottom of the portion to be cut. The cushion according to claim 1, wherein the overhanging portion is formed so as to surround a circular opening at the center of the bottom of the portion surrounded by the vertical and horizontal partitions. The cushion according to claim 1, wherein the overhanging portion is formed so as to surround a square opening at the center of the bottom of the portion surrounded by the vertical and horizontal partitions. The cushion according to any one of claims 1 to 3, wherein an area of the overhang portion is arbitrarily set to adjust a degree of deflection of the vertical and horizontal partition walls. The thin vertical and horizontal partitions having elasticity are arranged side by side in a lattice shape in a plan view, and the outer periphery is surrounded by the partitions, and the bottom of the portion surrounded by the vertical and horizontal partitions is the lower end of the vertical and horizontal partitions. After obtaining an elastomeric cushion base material integrally molded so as to be closed by a continuous bottom film, the bottom film is punched into a predetermined shape, and the bottom and the bottom of a portion surrounded by the vertical and horizontal partition walls, The method for producing a cushion according to any one of claims 1 to 4, wherein a projecting portion projecting from a lower end of the partition wall is formed.

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