JP2012040170A - Cushion - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cushion, especially as a cushion to be used for a wheelchair, which: disperses the body pressure of a user without sharply changing the body pressure by continuously changing repulsive force of a cushion material in an anteroposterior direction of the user; and, at the same time, enables the user to properly select the cushion as either hip-forward-slide preventing application or a leg pedaling application.SOLUTION: The cushion 10 has an approximately square flat shape. A gel sheet 20 is arranged in the upper layer section, a low repulsion cushion material 30 is arranged in the intermediate layer section, and a high repulsion cushion material 40 is arranged in the lower layer section. The gel sheet 20 is constituted of two regions of a first honeycomb structure 21 and a second honeycomb structure 22. The low repulsion cushion material 30 has a structure wherein the bottom surface has an inclination. In order to correspond to the inclination, the upper surface of the high repulsion cushion material 40 has an inclination to be symmetrical to the low repulsion cushion material 30. The cushion 10 has a constitution wherein when respective slopes are arranged by stacking them, a rectangular parallelepiped is formed.

Description

  The present invention relates to a cushion used for a wheelchair, an easy chair, and the like, and more particularly to a cushion used on a seat of a wheelchair.

  If you sit in a wheelchair or chair for a long time, people with physical disabilities will not be able to sit back frequently, and the body pressure will concentrate on the local area, preventing blood circulation in the area and causing bed slippage. .

  Therefore, a sheet coated with a covering material such as foamed polyurethane foam, etc., which has excellent body pressure dispersibility as a cushioning material used in wheelchairs and chair seats, and a fluid thermoplastic resin or gel. A flexible material such as a shape material has been used alone or in combination.

In addition, the body pressure distribution of the seat is not constant, and the body pressure applied to the buttocks increases, so if you sit for a long time, the cushioning property of the buttocks of the cushioning material will be lost, and the buttocks will contact the seat directly (bottomed ) In addition, since a flexible material is used, the body pressure dispersibility is excellent, but there is also a problem that if the user sits for a long time, the buttocks easily move forward (displacement).
Therefore, as in the cushion structure of Patent Document 1, cushion materials with different hardnesses are arranged according to the body pressure distribution to prevent local concentration and bottoming of body pressure, and to prevent forward displacement, There is one in which the part in contact with the part is three-dimensionally formed.

  In addition, the seat surface of the chair of Patent Document 2 has a structure in which cushions having different hardnesses are bonded to each other at an inclined surface connecting ridges located at opposite corners of a rectangular parallelepiped cushion. Since it has changed gently, it is comfortable to sit on.

Japanese Patent No. 3564218 Published Utility Sho 56-92548

  However, the cushion structure of Patent Document 1 has a drawback that the structure is very complicated, there are many joints, and the manufacturing cost is very high. In addition, when taking a structure where the cushion material is arranged or adhered in the front-rear direction, there is a part where the member is cured along the boundary of the adhesive surface on the seating surface side, so that the body pressure dispersion effect is reduced only in that part, Since the touch is inevitably deteriorated, even if the cover is put on, the user feels uncomfortable or uncomfortable when sitting.

In addition, the part in contact with the thigh has a three-dimensional shape to prevent forward displacement, but because it is a three-dimensional shape, the user's physique can be limited, Or it has the fault that it cannot necessarily optimize for the user who asks various seating postures by the symptom and the body freedom.
In addition, when the cushion material of Patent Document 1 is applied to a wheelchair, there are many users who use their feet for the operation of the wheelchair (legs), and depending on the user who is difficult to make a leg in the case of the three-dimensional structure, It can be very inconvenient.

  Moreover, since the cushion structure of patent document 2 has stuck the inclination part which cross-sectional shape became a triangle, it is difficult to match | combine a vertex and lacks manufacturing stability.

  In addition, as in Patent Document 1 and Patent Document 2, since the cushion material is always in close contact with the entire lower surface of the buttocks and thighs, there is also a drawback that the air permeability is poor and the film is easily stuffy.

  The present invention has been made in view of the above, and in particular, in a cushion used for a wheelchair, by continuously changing the repulsive force of the cushioning material, the body pressure is dispersed without abrupt changes, and forward slip prevention is achieved. The object is to provide a cushion that allows the user to select a use and a use for a foothold at appropriate times.

  The cushion according to claim 1 of the present invention includes an upper layer portion made of a polymer gel sheet in which a plurality of honeycomb structures are combined, and an intermediate layer made of a low-repulsive force cushion material disposed below the upper layer portion. And a lower layer portion made of a high repulsive force cushioning material disposed below the intermediate layer portion and having a higher repulsive force than the cushioning material of the intermediate layer portion, the intermediate layer portion having a trapezoidal shape in cross section The bottom surface is inclined, the lower layer portion is trapezoidal in cross section, and the upper surface is inclined symmetrically with the inclination of the bottom surface of the intermediate layer portion, and the inclined surfaces of the intermediate layer portion and the lower layer portion are vertically It is characterized by being placed in surface contact so as to overlap.

  The cushion according to claim 2 is the cushion according to claim 1, wherein the cushion material of the lower layer portion has a hardness of 2 to 6 times the hardness of the cushion material of the intermediate layer portion. It is characterized by having.

  The invention according to claim 3 is the cushion according to claim 1 or 2, wherein the polymer gel sheet of the upper layer portion is divided into two regions, and the first region is a first honeycomb structure having a substantially hexagonal shape in a top view. The second region is characterized by having a second honeycomb structure having an outer shape substantially the same as the hexagonal shape in a top view and further having a side connecting the center and the apex.

  The invention according to claim 4 is the cushion according to claim 3, wherein the polymer gel sheet is arranged in a direction in which the first region has a thickness of the intermediate layer portion increasing. It is characterized by that.

  The invention according to claim 5 is characterized in that the cushion according to any one of claims 1 to 4 is covered with a cover.

  The cushion of the present invention is different in the hardness of the cushion material of the intermediate layer portion and the lower layer portion, has a trapezoidal cross-sectional shape and is arranged in surface contact with the inclined portion, so that the repulsive force of the cushion structure is Since it changes continuously in the front-rear direction, it is very excellent in dispersion of body pressure and has a comfortable structure.

  In addition, when the cushion of the present invention is laid on a wheelchair, if the part with high repulsive force is placed in front and sits down, the hip part sinks deeper than the thigh, so it is comfortable and prevents forward slip It is also possible to prevent bedsores. On the other hand, if you sit with the part with low repulsive force forward, the thigh will sink deeper, so it has an excellent effect that you can create a posture and inclination that makes it easier to step Yes.

  Furthermore, since the cross-sectional shapes of the intermediate layer portion and the lower layer portion are trapezoidal, when joining the inclined portions with an adhesive or the like, there is a vertical surface during the joining operation, and positioning is easy. In addition, since there is no end portion of the joint surface on the seating surface side, there is no sense of incongruity such as a step difference when seated.

  In addition, a polymer gel sheet having a honeycomb structure having a plurality of shapes is arranged in the upper layer portion, and the seating surface is stabilized and the gel filling amount is reduced as compared with the conventional planar sheet, so that it becomes lighter and easier to handle. In addition, since the honeycomb portion is flexible, the followability to the movement of the user is good. In addition, the honeycomb structure has good air permeability and can eliminate stuffiness. Note that the gel sheet of the present invention also serves as shock absorption, and is useful for mitigating the impact when seated.

  Further, since the polymer gel sheet is combined with a honeycomb structure having a plurality of shapes, the holding force and the followability to the movement of the user can be changed depending on the part. In particular, the gel sheet is divided into two regions, the first region is composed of a first honeycomb structure having a substantially hexagonal shape when viewed from above with a small holding force and good followability, and the second region has a high retaining force and high stability. The second honeycomb structure further having a side having a substantially hexagonal center and apex connected thereto, and the direction of the first region and the overlapped portion of the intermediate layer portion and the lower portion of the cushion material having a small repulsive force When sitting with the first region facing forward, the front is flexible and can easily follow movement, and the rear has a high holding power and stability, so it is easy to step on the foot. When sitting with the two regions in front, the rear part is flexible, so it sinks deeply, and the front part has high holding power and stability, so that it is possible to prevent a forward shift and to be comfortable.

  Furthermore, if the cushion structure is collectively covered with an appropriate cover, the gel sheet and each cushion material need not be joined with an adhesive or the like, and the number of work steps for joining can be reduced.

1 shows an overall view of an embodiment of a cushion according to the present invention. (A) is a front view and (b) is a plan view. The enlarged view of the honeycomb structure of the gel sheet which concerns on this invention is shown. The figure at the time of using the cushion which concerns on this invention for a wheelchair is shown. (A) is a front displacement prevention use, (b) shows the cushion arrangement | positioning at the time of a foot use.

Embodiments of the present invention will be described with reference to the drawings. An overall configuration diagram of the present invention is shown in FIG.
The cushion 10 has a substantially rectangular planar shape, and a gel sheet 20 is disposed in the upper layer portion, a low repulsion force cushion material 30 is disposed in the intermediate layer portion, and a high repulsion force cushion material 40 is disposed in the lower layer portion. The overall height is 4-8 cm.

  The gel sheet 20 in the upper layer portion has a honeycomb structure, and in this embodiment, as shown in FIG. 1, the gel sheet 20 is divided into two at the center in the top view, the first region is composed of the first honeycomb structure 21, and the second region is the second region. It is composed of a honeycomb structure 22.

  The first honeycomb structure 21 has a substantially hexagonal shape when viewed from above, and the second honeycomb structure 22 has a structure further having a side connecting the center and apex of the generally hexagonal shape when viewed from above (that is, the first honeycomb structure has six triangular shapes gathered together. The same outer shape as that of No. 21 is configured). The portions corresponding to the respective sides are filled with gel, and the other portions, according to the enlarged view of the honeycomb structure in FIG. For this reason, even if it sits down, it can breathe well and can prevent stuffiness. In addition, since the weight is lighter than that of a flat gel sheet, there is an advantage that handling is improved. The honeycomb structure is not limited to a substantially hexagonal shape but may be a substantially triangular shape, a rectangular shape such as a substantially rectangular shape, or a substantially circular shape.

  Further, the second honeycomb structure 22 has a larger amount of gel and an area of the gel on the upper surface than the first honeycomb structure 21, so that the holding power is high and the sinking when sitting is suppressed. . On the other hand, the first honeycomb structure 21 has a low holding force, so that the flexibility is high, and the first honeycomb structure 21 has a structure that sinks deeply when a large load is applied such as when sitting down. The followability to the person's longitudinal movement and load is improved.

  As for the honeycomb structure of the gel sheet 20, not only the first honeycomb structure 21 and the second honeycomb structure 22 are arranged in two parts, but also a plurality of kinds of honeycomb structures can be arranged according to the body pressure distribution of the user.

  Next, the low repulsion force cushioning material 30 of the intermediate layer portion has a structure in which the upper surface is flat while the bottom surface has an inclination, and has a trapezoidal cross section as shown in FIG. Yes. In addition, the high repulsive force cushion material 40 in the lower layer portion has an upper surface inclined symmetrically with the low repulsive force cushion material 30, and is configured to be a rectangular parallelepiped when the inclined surfaces are arranged in an overlapping manner.

The material of the cushion material is preferably urethane foam, and it is preferable to use a material excellent in breathability, weather resistance, and dehumidification.
The composition of the low repulsion force cushioning material 30 in the intermediate layer portion has a density of 60 kg / m ³ and a hardness of 70N. Further, the composition of the high repulsion force cushioning material 40 in the lower layer part has a density of 25 kg / m ³ and a hardness of 230 N. The high resilience cushion material 40 is about three times the hardness of the low resilience cushion material 30. The ratio should be set to about 2 to 6 times depending on the structure and thickness of the cushion.

  The inclined surface on which the low-repulsive force cushion material 30 and the high-repulsive force cushion material 40 are stacked is configured over the entire surface. For this reason, the repulsive force of the cushion structure changes continuously, so that the sitting comfort does not give a sense of incongruity. Naturally, when the ratio of the low repulsive force cushion material 30 is large, the total repulsive force is small, and conversely, when the ratio of the high repulsive force cushion material 40 is large, the total repulsive force increases.

  The inclination angle α of the low-repulsive force cushion material 30 and the high-repulsive force cushion material 40 is 10 degrees in this embodiment, but can be appropriately set depending on the size of the cushion 10 and the physique of the user. By optimizing the inclination angle α, it is possible to obtain a structure having both the effect of preventing the forward displacement of the load and the effect of ease of footing.

  When the low-repulsive force cushion material 30 and the high-repulsive force cushion material 40 are arranged to overlap with each other, when joining with an inclined surface using an adhesive, both ends of the adhesive surface should be on the seating surface (upper surface). There is no and everything is on the side. Because the adhesive cures at the edges, the effect of dispersing body pressure only on that part will be diminished, or the feeling will inevitably deteriorate, so if there is an edge on the seating surface, it may give an uncomfortable feeling such as discomfort or a step difference . However, when the end portions are all present on the side surfaces as in the present invention, the above-mentioned drawbacks can be solved.

  Further, since the low repulsive force cushion material 30 and the high repulsive force cushion material 40 each have a trapezoidal cross-sectional shape in which only one surface is inclined, positioning is very easy because there are two vertical surfaces when bonding the inclined surfaces. Easy to be. When trying to paste triangular cushions together, it becomes very difficult to bond the apexes together.

  As shown in FIG. 1, the gel sheet 20 of the cushion 10, the low repulsive force cushion material 30, and the high repulsive force cushion material 40 are arranged in the region of the first honeycomb structure 21 of the gel sheet 20 with the thickness of the low repulsive force cushion material 30. It is good to arrange in the direction to become thicker.

  As shown in FIG. 3A, when the cushion 10 having a larger repulsive force is arranged toward the front (front direction of the user) of the wheelchair, the buttocks sink deeply and the rear is inclined downward. For this reason, it is possible to sit deeper, and even if the waist is moved, the low resilience cushioning material 30 and the first honeycomb structure 21 of the gel sheet 20 can follow the movement appropriately and prevent the forward displacement. In addition, it is comfortable to sit on and helps prevent bedsores.

  On the other hand, as shown in FIG. 3 (b), when the cushion 10 having a smaller repulsive force is disposed toward the front of the wheelchair (frontward of the user), the thigh deeply sinks and the front is inclined downward. . For this reason, it becomes easy to carry out a leg. In addition, the region of the first honeycomb structure 21 of the gel sheet 20 flexibly follows the movement, and the region of the second honeycomb structure 22 has a high holding power, so that the stability is good and the body is not easily shaken. Can be.

  The cushion 10 may be configured such that each component is joined by an adhesive or the like, but is covered with a cover (not shown) formed along the outer shape of the cushion 10 so that the arrangement of the components does not collapse. You can also. Since it is not necessary to join the constituent members of the cushion 10 with an adhesive or the like, the number of work steps for joining can be reduced.

  The cushion of the present invention, particularly in a cushion used for wheelchairs, disperses without suddenly changing body pressure by continuously changing the repulsive force of the cushion material in the front-rear direction of the user, so it is comfortable to sit and prevents bed slipping In addition, it is possible to appropriately select a use for preventing a forward shift and a use for a foot depending on the arrangement direction.

DESCRIPTION OF SYMBOLS 10 Cushion 20 Gel sheet 21 1st honeycomb structure 22 2nd honeycomb structure 30 Low repulsion force cushion material 40 High repulsion force cushion material

Claims (5)

An upper layer portion made of a polymer gel sheet in which a plurality of honeycomb structures are combined;
An intermediate layer portion made of a low repulsive force cushion material disposed on the lower side of the upper layer portion;
A lower layer portion made of a high repulsive force cushion material disposed below the intermediate layer portion and having a higher repulsive force than the cushion material of the intermediate layer portion,
The intermediate layer portion has a trapezoidal shape in cross section and the bottom surface is inclined,
The lower layer portion has a trapezoidal shape in cross section and the upper surface is inclined symmetrically with the inclination of the bottom surface of the intermediate layer portion;
The cushion characterized by arrange | positioning the surface contact so that the inclined surfaces of the said intermediate | middle layer part and the said lower layer part may overlap up and down. The cushion according to claim 1,
The cushion of the lower layer portion has a hardness of 2 to 6 times the hardness of the cushion member of the intermediate layer portion. The cushion according to claim 1 or 2,
The upper layer polymer gel sheet is divided into two regions, the first region is composed of a first honeycomb structure having a substantially hexagonal shape when viewed from above, and the second region has an outer shape having the same shape as the substantially hexagonal shape when viewed from above. Furthermore, the cushion which consists of a 2nd honeycomb structure which has the side which tied the center and the vertex. The cushion according to claim 3, wherein the polymer gel sheet is
The cushion, wherein the first region is arranged in a direction in which the thickness of the intermediate layer portion increases.   The cushion according to any one of claims 1 to 4, wherein the cushion is covered with a cover.

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