JP2003265274A - Seating posture holding cushion - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a favorite cushion (kneeling cushion) for wheel chairs, which is excellent in seating and fitness feeling and has good body pressure dispersion, and decreases stuffy feeling and prevent bed sores and in which a posture is hard to collapse and seating position is maintained for a long period. <P>SOLUTION: This cushion for maintaining seating position has 75% compression hardness of 100 kg ≤ and ≤140 kg of the huckle bone and 75% compression hardness of ≥60 kg and ≤100 kg of the thigh bone. The cushion material is of a net structure. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cushion (comfort cushion) which is capable of maintaining a comfortable posture on a seat when the user sits on a chair for a long period of time. In particular, the present invention relates to a cushion for a wheelchair for a physically handicapped person or the like, which is capable of changing body positions.

[0002]

2. Description of the Related Art Bicycles, automobiles, railway vehicles, passenger planes,
Cushion material for wheelchairs, cotton, wool, foam material (particularly urethane foam), polymer gel material, non-elastic crimp fiber stuffed cotton, non-elastic crimp fiber-bonded resin cotton or hard cotton, and air Cushions (air cushions) are used.

The purpose of these cushions is to compensate the hardness of the seat surface and improve the sitting comfort (body pressure dispersibility). Therefore, although it has appropriate softness, it is easy to lose its posture, and it is difficult to keep cleanliness for some things.

There are also cushions for the purpose of maintaining the posture, but these materials have different performances such as non-breathable materials filled with polymer gel and various foam materials (particularly urethane foam). Is a complex combination of. When a non-breathable material is used as a cushion as described above, the humidity in the clothing of the buttocks rises, and a feeling of discomfort is felt, which is not comfortable. In particular, in the case of elderly people whose posture is difficult to change, an increase in humidity in the buttocks leads to promotion of pressure ulcers, which is not preferable.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cushion (cushion) which is stable in posture and maintains a sitting posture for a long time, and which is excellent in sitting comfort and comfort. In particular, it is an object of the present invention to provide a cushion (cushion) for a wheelchair that maintains a sitting posture, has excellent dispersibility in body pressure, reduces a feeling of swelling, and prevents pressure ulcers.

[0006]

In order to achieve the above object, the present invention adopts the following constitutions. That is, 75% compression hardness of the ischial region of the sitting support cushion is 100 kg or more and 140 kg or less, and 75% compression hardness of the thigh region is 60 kg.
The sitting position holding cushion is 100 kg or less, and the cushioning member is a net-like structure.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention adopts the following method in order to realize a cushion excellent in seat-holding property, sitting comfort (pressure dispersibility), and comfort (reduction of uncomfortable feeling).

It can be said that the sacrum does not move for a long time and the posture does not easily collapse unless the buttocks move forward and sideward of the seat surface in order to satisfy the sitting posture. However, in a flat seat having an even compression characteristic, the buttocks are not supported, so that the buttocks are moved forward and sideward, which causes a kyphosis posture and a scoliosis posture, which is a physical obstacle.

The buttocks prevent the seat surface from moving forward and sideward,
In order to satisfy the sitting posture, the movement of the sacrum can be prevented by placing the thigh above the buttocks.

The present invention has a 75% compression hardness of the ischial region of 1
It was found that a sitting posture can be obtained by setting different compression characteristics of 00 kg or more and 140 kg or less and 75% compression hardness of the thigh region of 60 kg or more and 100 kg or less.

75% compression hardness in the ischial region, 7 in the thigh region
The 5% compression hardness follows the method described in JIS K 6401 5.4.2. The sciatic part corresponds to the lower part of the buttocks when sitting, and the thigh part corresponds to the lower part of the thigh when sitting.

Although the load ratio of the human body when the sitting posture is maintained has been published in various documents, generally, the load applied to the vicinity of the ischium is larger than the load applied to the vicinity of the thigh. From this, the sitting posture can be obtained by making the 75% compression hardness of the ischial region harder than the 75% compression hardness of the thigh region. Specifically, it is as described in the above paragraph No. 0011.

Next, in order to obtain the above-mentioned compression hardness, the following manufacturing method can be considered, but not limited thereto.

As the material of the cushion material, hard cotton (fiber cushion) and foamed urethane in which polyester short fibers and low melting point adhesive fibers are mixed and thermocompression molded to adjust the thickness and compression characteristics, More preferably,
A reticulated structure made of a polyester-based thermoplastic resin in which a continuous linear random loop made of a thermoplastic elastomer having rubber elasticity is formed into a three-dimensional spring structure can be used.

The polyester of the present invention means polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN),
Polycyclohexylene dimethyl terephthalate (PCH
DT), polyethylene isophthalate (PEI) and the like and their copolyesters such as block copolymers of PBT and polytetramethylene glycol (PTMG),
The main repeating unit such as a copolymer of PET and PEI is made of polyester. The polyester elastomer is a block copolymer of a hard segment and a soft segment. Examples of the hard segment include PET, PEN, PBT and PCHDT, and examples of the soft segment include PTMG and polohexamethylene glycol (PHMG). ), Polypropylene glycol (PPG), polycaprolactam (PCL) and the like.

Since the net-like structure of the present invention has a random loop three-dimensional spring structure consisting of continuous filaments, it has a large gap between the upper surface and the lower surface thereof. Therefore, when the net-like structure is used as a padding for bedding, air, heat and moisture can be transferred between the body of the user of the bedding and the bottom of the bedding, and the occurrence of a feeling of discomfort can be suppressed. It is possible to obtain a comfortable seating feeling for the user.

Further, it is possible to make adjustment by laminating two cushion materials having different compression hardness, or by laminating a flat plate between them.

It is desirable that the flat plate should not be easily deformed by the weight thereof in order to hold the upper seat surface of the thigh. As the material, any material such as glass, wood, metal plate and various polymer sheets (fabric such as knitted fabric and woven fabric) can be used, but from the viewpoint of environment, polyester sheet is preferable.

The method for adhering the two cushion materials obtained is not particularly limited, such as an inorganic adhesive, an organic adhesive, or a low melting point nonwoven fabric.

The evaluation method used in the present invention is as follows. (1) Evaluation of physical properties 1) Evaluation method of bulk density: The sample cushion was kept at 20 ° C. and 65 ° C.
Allow the sample to stand for 24 hours in a% RH environment, measure the sample weight,
The bulk density was calculated. 2) Compression hardness: in accordance with the method described in JIS K 6401 5.4.2, using a compression plate (200 mmφ), 5
The compression length is (sample thickness x 0.2 at a speed of 0 mm / min.
The load (kg) at 5) mm was calculated.

(2) Clinical Evaluation A sample cushion was placed on a wheelchair (made by Kawamura Cycle Co., Ltd.) and used by 10 test subjects for 2 weeks for the following evaluation. 1) Retention of sitting position (front): The degree of the feeling of shifting to the front after sitting was evaluated by a subjective report. Does not shift to the front: ◎, does not shift to the front: ○ Slightly shifts to the front: △, shifts to the front: × 2) Sedentary retention (side): Subjective declaration of the degree of shift to the side after sitting evaluated. No lateral shift: ◎, almost no lateral shift: ○ Slight lateral shift: △, lateral shift: × 3) Pressure dispersiveness (sacral region): pressure on the sacral region after sitting Was evaluated by subjective declaration. No feeling: ◎, almost no feeling: ○ Slightly felt: △, felt: × 4) Pressure dispersiveness (thigh): The degree to which pressure was felt on the thigh after sitting was evaluated by a subjective report. Not felt: ◎, hardly felt: ○ Slightly felt: △, felt: × 5) Discomfort: The degree of discomfort felt in the buttocks when sitting was evaluated by a subjective report. Not felt: ◎, hardly felt: ○ Slightly felt: △, felt: ×

Cushion making method: Examples 1 to 1 below
A sitting position holding cushion was prepared using the members shown in No. 3 and Comparative Examples 1 and 2. As the adhesive for the member, a conventional organic adhesive was used.

Example 1 Upper layer cushion (hollow fineness 1448 decitex, bulk density 55 kg / m ³ ) which is a net-like structure (Breath Air, manufactured by Toyobo Co., Ltd.) made of polyester type thermoplastic resin,
Thickness 3.5 cm, width 42 cm, length 40 cm and cushion for lower layer (hollow fineness 1448 decitex, bulk density 6)
5 kg / m ³ , thickness 3.0 cm, width 36 cm, length 40
cm) was created. Next, a part corresponding to the buttocks was hollowed in the seat surface length direction by 22 cm and in the seat surface width direction by 33 cm. A flat plate (polyester warp knitted fabric (Stretch Fine SH-100, manufactured by Toyobo Co., Ltd.)) was sandwiched between them and bonded using a known adhesive.

Example 2 Cushion for upper layer (hollow fineness 1448 decitex, bulk density 65 kg / m ³ ) which is a net-like structure (Breath Air, manufactured by Toyobo Co., Ltd.) made of polyester type thermoplastic resin,
Thickness 3.0 cm, width 42 cm, length 40 cm and cushion for lower layer (hollow fineness 1448 decitex, bulk density 6)
5 kg / m ³ , thickness 3.0 cm, width 36 cm, length 40
cm) was created. Next, a part corresponding to the buttocks was hollowed in the seat surface length direction by 22 cm and in the seat surface width direction by 33 cm. A flat plate (polyester warp knitted fabric (Stretch Fine SH-100, manufactured by Toyobo Co., Ltd.)) was sandwiched between them and bonded using a known adhesive.

Example 3 Cushion for upper layer (hollow fineness 1448 decitex, bulk density 45 kg / m ³ ) which is a net-like structure (breath air, manufactured by Toyobo Co., Ltd.) made of polyester type thermoplastic resin,
Thickness 3.5 cm, width 42 cm, length 40 cm and cushion for lower layer (hollow fineness 1448 decitex, bulk density 6)
5 kg / m ³ , thickness 3.0 cm, width 36 cm, length 40
cm) was created. Next, a part corresponding to the buttocks was hollowed in the seat surface length direction by 22 cm and in the seat surface width direction by 33 cm. A flat plate (polyester warp knitted fabric (Stretch Fine SH-100, manufactured by Toyobo Co., Ltd.)) was sandwiched between them and bonded using a known adhesive.

Comparative Example 1 Cushion for upper layer (hollow fineness 1448 decitex, bulk density 30 kg / m ³ ) which is a net-like structure (breath air, manufactured by Toyobo Co., Ltd.) made of polyester type thermoplastic resin,
Thickness 2.0 cm, width 42 cm, length 40 cm and cushion for lower layer (hollow fineness 1448 decitex, bulk density 4)
5 kg / m ³ , thickness 3.0 cm, width 36 cm, length 40
cm) was created. Next, a part corresponding to the buttocks was hollowed in the seat surface length direction by 22 cm and in the seat surface width direction by 33 cm. A flat plate (polyester warp knitted fabric (Stretch Fine SH-100, manufactured by Toyobo Co., Ltd.)) was sandwiched between them and bonded using a known adhesive.

Comparative Example 2 Cushion for upper layer (hollow fineness 1448 decitex, bulk density 80 kg / m ³ ) which is a net-like structure (Breath Air, manufactured by Toyobo Co., Ltd.) made of polyester type thermoplastic resin,
Thickness 3.5 cm, width 42 cm, length 40 cm and cushion for lower layer (hollow fineness 1448 decitex, bulk density 4)
5 kg / m ³ , thickness 3.0 cm, width 36 cm, length 40
cm) was created. Next, a part corresponding to the buttocks was hollowed in the seat surface length direction by 22 cm and in the seat surface width direction by 33 cm. A flat plate (polyester warp knitted fabric (Stretch Fine SH-100, manufactured by Toyobo Co., Ltd.)) was sandwiched between them and bonded using a known adhesive.

Table 1 shows the results of clinical evaluation.

[Table 1]

[0029]

EFFECTS OF THE INVENTION The cushion according to the present invention does not easily lose its sitting posture even if it is seated for a long period of time. Especially, even when sitting on a chair or a wheelchair for a long time, the buttocks are shifted forward and sideways, which is called sacral sitting. It is possible to prevent such a posture in which the burden on the body is heavy, and it is possible to prevent the feeling of discomfort due to sweat or the like from the skin.

[Brief description of drawings]

FIG. 1 is a perspective view showing the external appearance of a sitting support cushion according to an example of the present invention when viewed from the rear.

FIG. 2 is a sectional view taken along the line AA ′ in FIG. 1 of the sitting support cushion according to the present invention.

FIG. 3 is a cross-sectional view taken along the line BB ′ in FIG. 1 of the sitting support cushion according to the present invention.

FIG. 4 is a schematic top view showing an example of the positional relationship between a lower bearing member and a flat plate in the sitting support cushion according to an example of the present invention.

[Explanation of symbols]

1… Upper surface seat cushion material 2 ... Lower surface cushioning material 3 ... Flat plate 4 ... Seating surface length direction 5 ... Seat width direction 6 ... sitting support cushion

Claims (2)

[Claims] 1. A 75% compression hardness of the ischial part of the sitting support cushion is 100 kg or more and 140 kg or less, and 7 of the thigh part is
A sitting support cushion having a 5% compression hardness of 60 kg or more and 100 kg or less. 2. The seated position holding cushion according to claim 1, wherein the cushion material is a net-like structure.