JP2001037594A - Seat cushion - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat cushion which can provide good seating comfort over a long time. SOLUTION: A seat face part 20 placed on the rear half of the seat surface 91 of a chair 90 and a back face part 30 placed on the lower half of the backrest part 92 of the chair 90 are both made from low-resiliency urethane foam. Thus, a seater can assume not a posture with high knee positions with respect to the buttocks nor a forwardly inclined posture that is more than necessary but a seating posture suited for work, and since the seat face part 20 and the back face part 30 are deformed into the shape of the buttocks, etc., of the seater, the seater's body weight can be approximately uniformly distributed over the entire seat face without causing locally strong resiliency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat cushion used on a chair having a backrest.

[0002]

2. Description of the Related Art An operator of an OA device who performs a long desk work uses a cushion made of a soft elastic material formed in a substantially same plane shape as a chair seat surface on the chair seat surface. Often do.

[0003]

However, in such a cushion made of a soft elastic material, a repulsive force is generated in accordance with the amount of deformation. The force acts, and this area is locally compressed, giving the person who is sitting an uncomfortable feeling of compression, and especially when sitting for a long time, causes blood circulation disorders and causes numbness in the buttocks etc. Easy to do.

[0004] Further, when the seat is formed in a substantially same plane shape as the chair seat surface, the cushion of a part of the buttocks is depressed, so that the thighs are lifted with respect to the buttocks, and a sitting position in which the knee position with respect to the buttocks is high. It is not easy to obtain a sitting posture suitable for work, and when sitting for a long time, the feeling of pressure on the back of the thighs is increased and the sitting comfort is likely to deteriorate.

[0005] Recently, cushions that are formed in advance in a form that fits the outer shape of the buttocks and waist, and are firmly supported so as to wrap around the buttocks and waist are also known. However, with such a cushion, it is difficult to change the sitting position or sitting posture on the seat surface, such as turning over while sleeping, and if you continue to sit for a long time, your waist will become loose and blood circulation disorders will occur. It is easy to invite and cause numbness of the buttocks.

The present invention has been made in view of the above problems, and has as its object to provide a cushion that can provide a comfortable sitting comfort for a long time.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a cushion which is used by being placed on a seat surface of a chair having a backrest portion, the seat portion being capable of being placed on a rear half surface of a chair seat surface. And a back portion that is foldably connected to the seat surface portion and that can be placed on the lower half surface portion of the chair back portion, and the seat surface portion and the back portion are made of a low-resilience synthetic resin foam. It is characterized by having been constituted.

[0008] According to such a configuration, the seat portion is placed on the rear half surface of the chair seat surface, so that the thigh portion located on the front half surface portion of the seat surface is lifted, and the sitting position where the knee position is high relative to the buttocks is raised. There is no attitude. Therefore,
A sitting posture suitable for the work is obtained, and unpleasant pressure on the back of the thigh does not occur.

Also, the back portion placed on the lower half surface of the back portion of the chair can firmly support the waist, and the back portion of the upper waist of the seated person is pushed forward, and the upper body is pushed. Is not inclined forward more than necessary.

[0010] Further, since the seat surface and the back surface are made of a low-resilience synthetic resin foam, the seat surface and the back surface of the cushion are recessed so as to conform to the shape of the buttocks of a seated person, and the sitting posture. As it can stabilize and does not generate a strong repulsive force in the recessed part, it does not give a local sensation of pressure to the person sitting, and distributes the weight almost uniformly over the entire seating surface Comfortable sitting comfort is obtained. Further, once the buttocks are separated from the seating surface and re-seated, the cushion has a shape corresponding to the new sitting posture, so that the cushion can be easily re-seated in a timely manner, so that comfortable sitting comfort can be obtained for a long time.

Furthermore, since the seat portion and the back portion are foldably connected to each other, the position of the back portion with respect to the seat portion is unlikely to be displaced when the user sits down again. The back part can be easily folded and compactly carried.

[0012] In such a cushion, it is desirable that the front surface of the seat surface is thinner than the rear end thereof. In this way, even if a large part of the weight acts and the rear end side of the seat surface portion is greatly recessed, the thigh portion mounted on the front end side of the seat surface portion is located at substantially the same height position as the buttocks mounted on the rear end side of the seat surface portion. Or the buttocks can be supported in a natural forward-down position, ensuring a more comfortable sitting position for work, and further reducing the pressure on the back of the thighs for a more comfortable sitting position. realizable.

Further, it is preferable that the seat surface is formed in a tapered shape in which the thickness decreases from the rear end side to the front end side. With this configuration, while the above-described operation and effect due to the small thickness of the front end side of the seating surface portion are obtained, the seating surface portion does not have a stepped portion serving as a local compression portion, so that more comfortable sitting comfort can be obtained.

In such a cushion,
It is preferable that the upper surface of the back surface is thinner than the lower surface. In this way, even if the lower end of the back part is greatly depressed, the upper end of the back part prevents the sitting part from pushing the back part of the upper waist of the person forward and the upper body from leaning forward more than necessary. A more suitable sitting posture can be obtained.

Further, it is desirable that the rear portion is formed in a tapered shape in which the thickness decreases from the lower end toward the upper end. With this configuration, while the above-described operation and effect due to the small thickness of the upper end side of the back portion are obtained, there is no step portion serving as a local compression portion on the back portion, so that more comfortable sitting comfort can be obtained.

The low-resilience synthetic resin foam constituting the seat and back of such a seat cushion includes:
Various known materials can be applied,
It is desirable to use a urethane resin foam from the viewpoint of functions such as heat dissipation and cost such as workability.

In the present invention, the term "low resilience" refers to a material property showing rebound resilience at a rebound rate of about 15% or less in a steel ball drop test. Incidentally, the repulsion rate of a general urethane foam is 35% or more.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a seat cushion according to the present invention will be described with reference to FIGS.

FIG. 1 shows this seat cushion 10 in a chair 9.
It is a perspective view showing the state set to 0. As shown in this figure, the seat cushion 10 is used by being placed on a seat surface 91 of a chair 90 having a backrest 92, and is foldably connected at a connecting portion 40. It comprises a face part 20 and a back part 30.
At the time of use shown in the drawing, the seating surface portion 20 is mounted on the rear half surface portion of the chair seating surface 91, and the back surface portion 30 is mounted on the lower half surface portion of the chair backrest portion 92.

FIGS. 2A and 2B are side sectional views of the seat cushion 10. FIG. 2A shows a state in which the seat section 20 and the back section 30 are opened, and FIG. 2B shows a state in which the seat section 20 and the back section 30 are opened. The closed (folded) state is shown.

As shown in FIG. 2A, the seat portion 20 and the back portion 30 are each formed of a seat portion main body 21 and a back portion main body 31 made of low-rebound urethane foam. It is integrally covered by a cover 41. The front and back surfaces of the cover 41 are sewn together at a portion where the rear end 23 of the seat body 21 and the lower end 33 of the back body 31 face each other. 20 and the back 30 are foldably connected (see FIG. 2B).

The seat body 21 and the back body 3
The low resilience urethane foam which constitutes No. 1 is produced by mixing a polyether polyol and a polyisocyanate as main raw materials with a mixing head including other auxiliaries and continuously foaming the foam. The glass transition point of the urethane resin is changed by using a polyol component that reduces the resilience of the urethane resin to about 3%. The low-resilience synthetic resin foam used for the seat cushion according to the present invention has a rebound rate of 15%.
If it is about the following, it can be used preferably, but it is more preferably about 5% or less, and very low rebound foam of 1% or less is particularly preferable. Further, in this embodiment, urethane foam is used, but various foams can be used as long as the foam is a known synthetic resin foam. For example, polyethylene foam, EVA foam, rubber sponge, EPT foam, PVC foam, polystyrene foam, silicone foam, polypropylene foam and the like can be used.

The seat body 21 is formed in a tapered shape such that the thickness t1 of the front end 22 becomes smaller than the thickness t2 of the rear end 23 from the rear end 23 toward the front end 22. ing. The back portion main body 31 is also formed in a tapered shape such that the thickness decreases from the lower end 33 toward the upper end 32 such that the thickness t3 of the upper end 32 is smaller than the thickness t4 of the lower end 33. In addition, the seat body 21 is configured to be thicker than the back body 31 on average.

FIG. 3 is a side cross-sectional view showing a state of use of the seat cushion 10.

As shown in this figure, when the person M sits on the seat cushion 10 set on the chair 90, the vicinity of the rear end 23 of the seat portion 20 on which the buttocks M1 rests is greatly recessed, and the buttocks M
It is deformed into a shape that conforms to 1. At this time, the seat portion 20
Since the front end 22 is formed to be thinner than the rear end 23, the thigh portion M2 is not lifted high even if the vicinity of the rear end 23 is greatly recessed. Therefore, a sitting posture suitable for the work in which the foot line L1 is substantially horizontal or slightly lowered forward can be obtained without the posture in which the knee M3 is raised with respect to the buttocks M1. Also, there is no uncomfortable feeling of pressure on the back of the thigh M2.

When the person M sits on the seat cushion 10, the lower end 33 of the rear portion 30, which is in contact with the waist M4, is greatly recessed and deformed to fit the waist M4. For this reason,
The waist M4 of the person M sitting is supported firmly. In addition, since the upper end 32 of the back part 30 at the position of the upper M5 of the waist M4 is configured to be thinner than the lower end 33, even if the vicinity of the lower end 33 is greatly recessed, the upper waist M5 is pressed so as to push the upper waist M5 forward. Never do. Furthermore, there is no cushion back portion 30 above M6 above this portion M5. Therefore, it is possible to realize an appropriate forward leaning posture suitable for work without the posture of the body line L2 of the sitting person M leaning forward more than necessary.

Since the seat portion 20 and the back portion 30 are made of low resilience urethane foam, the person M
When the user sits, the user can deform to conform to the shape of the person's buttocks M1 and the like, support the buttocks M1 and the waist M4, and stabilize the sitting posture, and at the same time, the person's buttocks M1
The weight can be distributed substantially uniformly over the entire seating surface without giving a strong local compressive force to the user, and a comfortable sitting comfort can be obtained.
Further, once the buttocks M1 are separated from the seating surface and re-seated, the shape is changed to a shape corresponding to a new sitting posture, so that a comfortable sitting comfort can be obtained for a long time while re-seating properly.

Further, since the seat portion 20 and the back portion 30 are foldably connected by the folding portion 40,
When the person M sits again, the position of the back part 30 with respect to the seat part 20 does not shift, so that comfort when sitting again can be obtained. In addition, the seat cushion 10 is
By folding the back part 30 and the back part 30, it is possible to make it compact, so that it can be easily stored and carried.

Although the present invention has been described with reference to the embodiment, the seat cushion according to the present invention is not limited to the above embodiment, and may be configured as follows.

(1) In the above embodiment, the seat surface 2
4 and the thickness of the back portion 30 is changed to a tapered shape. However, as in the seat cushion 50 shown in FIG. 4, the thickness t5 and t6 of the back portion 30 and the seat portion 20 connected by the folding portion 54 are provided. May have a constant thickness. In addition, even with such a configuration, the thickness t5 of the seat surface portion 20 to which more weight is applied may be configured to be thicker than the thickness t6 of the back surface portion 30.

(2) In the above embodiment, the seat surface 2
Both the 0 and the back 30 are configured as flat members without holes or the like. However, as in a seat cushion 60 shown in FIG. 5, for example, a hole 65 or a recess is provided at a substantially central position of the seat 62. May be adopted. With this configuration, sufficient air permeability can be obtained by the hole 65, and pressure at the center of the seat portion 62 is eliminated, so that a person with hemorrhoids can also use it comfortably. Such a hole 65 or the like can be provided at an appropriate position as needed. For example, the hole 65 may be provided at a position including the back surface 63 and the folded portion 64.

(3) In the above embodiment, the seat surface 2
Although the thickness of the rear part 30 and the thickness of the rear part 30 are changed to a tapered shape, by providing a step 721 in the seat part 72 as in the seat cushion 70 shown in FIG. 6, the thickness t7 of the front end side 722 is reduced. The rear end 723 may be configured to be thinner than the thickness t8. Also, by providing a step 731 on the back surface 73, the upper end 73
2 may be configured so that the thickness t9 is smaller than the thickness t10 of the lower end 733. Even with such a configuration, it is possible to obtain a comfortable sitting comfort for a long time as in the above embodiment.

(4) In the above embodiment, the seat cushion according to the present invention is mainly used for the chair 90 used for desk work or the like, but it is used for seats of automobiles, airplanes, railway cars, etc., barbers, beauty salons, and hospitals. The seat cushion according to the present invention, such as a theater, a baseball field, and a pachinko parlor, can be used for various chairs.

(5) In the above embodiment, the seat surface portion 20 of the seat cushion 10 is configured to be sized so as to cover only the rear half surface of the seat surface 91 of the chair 90. As long as the rear half surface portion of the seating surface 91 of the 90 can be covered, the size may be such that it can cover substantially the entire surface of the seating surface 91. Seat cushion 1
Similarly, if the back surface 30 of the chair 90 can cover the lower half surface of the backrest 92 of the chair 90,
The backrest 92 may be configured to have a size that can cover substantially the entire surface. Even with such a configuration, the seat portion 20
By positioning the rear half of the chair seat surface 91 and the rear half of the chair backrest 92, the buttocks and waist of a seated person can be firmly supported.

(6) In the above-described embodiment, the use mode in which the seat surface portion 20 and the back surface portion 30 of the cushion 10 are bent and placed on the seat surface 91 and the backrest portion 92 of the chair 90, respectively, has been described. It goes without saying that the user may arbitrarily select a specific usage mode as long as the seat cushion according to the present invention can adopt the above usage mode. For example, the cushion 10 may be used in an open state without bending the seat surface portion 20 and the back surface portion 30.

[0036]

As described above, according to the seat cushion according to the present invention, since the seat portion is placed on the rear half surface of the chair seat surface, the thigh portion located on the front half surface portion of the seat surface. Is not lifted, and a sitting posture suitable for work can be obtained, and unpleasant feeling of pressure on the back of the thigh does not occur. In addition, since the back part is placed on the lower half of the chair back part, it is possible to support the waist firmly, and it is possible to press the back part of the upper waist of the seated person to push forward. Because there is no body, the upper body of the person sitting does not lean forward more than necessary.

Further, since the seat surface and the back surface are made of a low-resilience synthetic resin foam, the seat surface and the back surface of the cushion are depressed so as to conform to the shape of the buttock of a person sitting on the cushion. Even when sitting, the seated person is not given a feeling of local pressure, and the weight is substantially uniformly distributed over the entire seating surface, so that a comfortable sitting feeling can be obtained. In addition, once the buttocks are separated from the seating surface and re-seated, the cushion has a shape corresponding to the new sitting posture, and since the seating surface and the back surface are connected, Since the position of the rear portion does not shift up, down, left, and right, comfort when sitting down again can be obtained.

Further, since the seat portion and the back portion are foldable, the seat portion and the back portion can be compactly folded and easily carried.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing one embodiment of a seat cushion according to the present invention.

FIG. 2 is a side sectional view of the seat cushion.

FIG. 3 is a side sectional view showing a usage state of the seat cushion.

FIG. 4 is a schematic perspective view showing another embodiment.

FIG. 5 is a schematic perspective view showing still another embodiment.

FIG. 6 is a schematic perspective view showing still another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Seat cushion 20 Seat part 21 Seat part main body 22 Seat part front end part 23 Seat part rear end part 30 Back part 31 Back part main body 32 Back part upper end part 33 Back part lower part 40 Folding part 41 Cover

Claims (6)

[Claims] 1. A cushion which is used by being placed on a seating surface of a chair having a backrest portion, the seating portion being able to be placed on a rear half surface portion of a chair seating surface, and A back portion that is foldably connected and can be placed on the lower half surface portion of the chair back portion, wherein the seat surface portion and the back portion are made of a low-resilience synthetic resin foam. Seat cushion. 2. The seat cushion according to claim 1, wherein the front surface of the seat portion is thinner than the rear end thereof. 3. The seat cushion according to claim 2, wherein the seat portion is formed in a tapered shape in which a thickness decreases from a rear end side to a front end side. 4. The seat cushion according to claim 1, wherein an upper end of the back portion is formed thinner than a lower end thereof. 5. The seat cushion according to claim 4, wherein the back portion is formed in a tapered shape in which a thickness decreases from a lower end side to an upper end side. 6. The seat cushion according to claim 1, wherein the synthetic resin foam is a urethane resin foam.