JP2009268710A - Seat cushion body and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat cushion body which uses polyurethane foam appropriate for a material of the seat cushion body and prevents a problem of the cushion body made of the polyurethane foam that an ischial tuberosity sinks in a focused manner when a passenger is seated to mitigate back pains and fatigue in the vicinity of buttocks due to the problem. <P>SOLUTION: The seat cushion body 17 which uses the soft polyurethane foam 18 as the main material is characterized by making a plate-like, surface rigidity reinforcing member 20 formed of a viscoelastic soft elastomer for reinforcing the rigidity of a seat surface on the upper part of the soft polyurethane foam 18 overlie at least the rear surface side of a seat 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a seat cushion body using a flexible polyurethane foam, and more particularly to a seat cushion body that reduces the occurrence of back pain and fatigue even when a passenger is seated for a long time.

  Currently, flexible polyurethane foam is widely used as a cushion body for various vehicle seats including automobile seats. This material is light, durable, easy to mass-produce, and very easy to use as a cushioning material.

  On the other hand, because the structure is a continuous foam cell structure, it is a material that tends to collapse against a compressive load, and the load part flexes intensively when subjected to a concentrated load. When used as a cushion body, it is also a material that generates the very essential problems described below.

  When the occupant sits on the seat as shown in FIG. 5 (a), the weight of the upper limb of the human body is transmitted from the spine supporting the limb to the pelvis, and most of the upper limb weight is transmitted to the seat side through the sciatic nodule of the pelvis. The sciatic nodule has a relatively pointed shape. Therefore, as shown in FIG. 5 (b), a concentrated load with a large surface pressure acts on the seat from the sciatic tuberosity, and this portion of the cushion body made of flexible polyurethane foam sinks intensively.

  In addition, the flexible polyurethane foam has a property of causing stress relaxation under a compressive load, and the above-mentioned sinking phenomenon becomes more prominent not only immediately after the occupant is seated but also during the seating. For this reason, the pelvis gradually sinks into the seat immediately after the occupant is seated, which causes the pelvis to rotate backward about the hip joint, and this action deforms the lumbar vertebra connected above the pelvis. And cause back pain. If this condition is repeated on a daily basis, the risk of inducing serious lumbar disease is extremely high.

  Also, if the sciatic nodule sunk into the seat intensively, the ability to support the weight of the sciatic nodule will decrease, and the burden on the surrounding hips and thighs will increase accordingly. Pressure increases, blood flow in the entire buttocks is obstructed, numbness and pain occur in the occupant's buttocks while sitting, and a heavy gait is felt when leaving the seat, causing a fatigue phenomenon unique to getting off the vehicle It has also become a cause.

In order to prevent such back pain and blood flow inhibition, various technical proposals have been disclosed for cushion bodies of seats (see Patent Documents 1 to 3).
Japanese Patent Publication No. 4-34436 Japanese Patent No. 3686691 JP-A-2003-284620 discloses a cushion sheet in which a viscoelastic polyurethane provided in a lower layer and an elastic polyurethane provided in an upper layer are integrally joined to each other on the front surface. A cushion sheet pursuing a comfortable absorbency is provided.

  Moreover, in the said patent document 2, it is a seat pad which made the loop which consisted of the continuous linear body of a thermoplastic elastic resin standing up and down toward the seating surface continuously in the horizontal direction, and, thereby, from the upper side at the time of seating It is excellent in conformity to the applied vertical pressure, is not fatigued, and provides a good comfort.

  Further, Patent Document 3 discloses a plate-like member that is placed on a seating surface as a posture correction tool, and that constitutes an inclined surface that becomes lower as it goes from the rear end edge to the front end edge, and ensures a forward inclined posture. By doing so, the posture of the pelvis is properly maintained, and blood flow is maintained and fatigue is prevented.

  According to the cushion bodies described in Patent Documents 1 to 3, although the predetermined effects can be achieved, respectively, as described above, it is light and durable, and in addition, mass production is easy. The use of polyurethane foam, which is an extremely easy-to-use material, cannot be ensured.

  The present invention uses polyurethane foam suitable as a material for the seat cushion body as it is, and prevents the sciatic nodule from sinking intensively when the occupant is seated, which is a problem of the polyurethane foam cushion body. An object of the present invention is to provide a seat cushion body suitable for sitting for a long period of time to reduce low back pain and fatigue around the buttocks resulting from this, and a method of manufacturing the same.

  In order to solve the above-mentioned problems, the present invention proposes a seat cushion body mainly composed of a flexible polyurethane foam, which is viscoelastic for enhancing rigidity of the seat surface at least on the rear surface side of the seat. A seat cushion body in which a plate-like surface rigidity reinforcing member formed of a soft elastomer is laminated on top of the soft polyurethane foam.

  In this way, in the cushion body mainly composed of flexible polyurethane foam, while strengthening the rigidity of the seating surface to prevent intensive sinking into the flexible polyurethane foam under the sciatic tuber of the occupant during sitting, Further, in order to alleviate and disperse the repulsive load from the cushion body by the action of the flow behavior, a plate-like surface rigidity reinforcing member formed of a viscoelastic soft elastomer is provided at least on the rear surface side of the seat. Laminated on top.

  In the present specification, the “surface rigidity enhancing member” refers to a plate-like member for enhancing the rigidity of the surface portion of the seat. Further, as an example of “soft elastomer”, the term “soft urethane elastomer” may be used as appropriate below.

  Further, the hardness, elongation modulus, and plate thickness of the soft elastomer are selected so that the surface hardness of the surface rigidity reinforcing member in the state of being laminated on the upper part of the flexible polyurethane foam is in the range of 5 to 50 degrees in Asuka C hardness. It is preferable.

  This is because it is necessary to strengthen the surface rigidity to prevent the seat surface from intensively sinking, and practically secure the support of the sciatic tuberosity while considering relaxation and dispersion of the repulsive load acting on this part. is there. When the repulsive load on the sciatic nodule increases, not only the feeling upon sitting is remarkably impaired, but also pain and blood flow inhibition occur in this part. Therefore, the hardness, elongation modulus, and plate thickness of the flexible elastomer are selected so that the surface hardness of the surface rigidity reinforcing member when laminated on the flexible polyurethane foam is in the range of 5 to 50 degrees in Asuka C hardness. .

  In other words, by setting the surface hardness of the soft elastomer when laminated to the flexible polyurethane foam to 5 to 50 degrees in Asuka C hardness, the sciatic nodules are supported, and the repulsive load on this part is relaxed and dispersed, but the cushion Depending on the shape and hardness of the flexible polyurethane foam constituting the body and the seating feeling preference of the occupant, it is preferable to finely harmonize the elongation rigidity of the surface rigidity reinforcing member laminated on the seating surface and the hardness of the soft elastomer. .

  Still further, the hardness, elongation modulus, and plate thickness of the flexible elastomer are such that the surface hardness of the surface rigidity reinforcing member in the state of being laminated on the upper part of the flexible polyurethane foam is in the range of 10 to 35 degrees in Asuka C hardness. It is preferable to be selected.

  Said Asuka C hardness is the surface hardness of the soft elastomer which forms the said surface rigidity reinforcement member in the state laminated | stacked on the upper part of the said flexible polyurethane foam in the state as a cushion body.

On the other hand, the soft elastomer material itself is a soft elastomer having an Asuka C hardness of 10 to 80 degrees and a 50% elongation modulus of 4.9 to 137 N / cm ² , and a thickness of 1.5 to 6.0 mm. With this soft elastomer plate material, the surface hardness of the soft elastomer in a state of being laminated on the soft polyurethane foam can be obtained in the range of Asuka C hardness of 5 to 50 degrees.

  The surface rigidity reinforcing member can be formed in a two-layer form by laminating a plate-like elastic material on the soft elastomer. In addition to a single surface stiffness enhancing member of a soft elastomer, a surface stiffness enhancing member having a two-layer configuration in which a plate-like member made of a cushioning elastic material is bonded to the surface of a soft elastomer. .

  As an effect of this, the elastic rigidity of the surface rigidity reinforcing member is strengthened without increasing the hardness of the soft elastomer, and the repulsive load on the sciatic nodule is dispersed by the cushioning action of the elastic material while increasing the supporting force of the sciatic nodule. be able to.

  The elastic material is a soft foam, or a fiber body obtained by sterically solidifying plastic fibers or natural fibers, and preferably has a thickness of 3 to 20 mm.

Specifically, the elastic material is a plate-like foam made of soft slab urethane foam or a plastic fiber made of polyester resin, polyamide resin, polypropylene resin, acrylic resin, or cotton, coconut, jute, hemp, etc. A plate-like fiber body in which natural fibers are solidified three-dimensionally corresponds. Of these, a soft slab urethane foam or a polyester fiber plate-like member is preferable. This is because the selection range of hardness, density, and elongation characteristics is wide, and physical characteristics such as mechanical strength, durability, and heat resistance are excellent, and it is suitable for elastic materials.

  In addition, the above-described fiber body is not particularly concerned with its form, for example, a block body formed by tangling fibers in a three-dimensional form, or a non-woven fabric formed beforehand with fibers, After laminating several sheets, it can be used as an elastic material.

  Further, the thickness of the elastic material is in the range of 3 to 20 mm as described above, but if the thickness is too thick, there is a concern about the phenomenon of sciatic tuberculosis sinking into this material. preferable.

  Further, the elastic material is preferably provided with a cut from the center of one side of the elastic material having the left and right sides of the seat as opposite ends to the opposite side.

  When seated, tension may be generated in the surface rigidity reinforcing member between the left and right sciatic nodules of the occupant, which may increase the feeling of repulsion to the sciatic nodules. In the case of a surface rigidity reinforcing member in a two-layer form in which an elastic material is bonded, the elastic material is cut from the center of one side of the elastic material with the left and right sides of the seat as opposite ends to the opposite side and left and right By dividing, it is possible to weaken the repulsive load acting on the sciatic nodules by weakening the rigidity in the lateral direction of this portion and weakening the tension of the surface rigidity reinforcing member generated between the left and right sciatic nodules of the occupant.

  Furthermore, it is preferable that the surface rigidity reinforcing member is provided with a plurality of through holes in an opening ratio in a range of 45% or less in area ratio.

  By providing the through hole in the surface rigidity reinforcing member, it is possible to weaken the elongation rigidity without lowering the hardness and to relax the support of the surface rigidity reinforcing member. In addition, the soft urethane elastomer can easily flow, and the repulsive load on the sciatic nodule can be reduced and the dispersibility can be further improved. In consideration of a decrease in strength, the aperture ratio is preferably 45% or less in terms of area ratio.

The soft urethane elastomer in the above-mentioned surface rigidity reinforcing member is preferably a solid non-foamed material, but a foamed material can also be used as long as the structure does not collapse under a compressive load and exhibits flow behavior. As described above, the plate thickness is suitably in the range of about 1.5 to 6 mm, but it has a higher density (10.29 KN / m ^{3 in} non-foamed structure) than the flexible polyurethane foam. It is preferable to make the plate as thin as possible as long as it does not interfere with the support function of the sciatic nodule because the material temperature exposed to hot air in summer and cold air in winter gives discomfort to the seated occupant.

  In addition, the present invention further proposes that when the reactive stock solution for producing the soft elastomer is in a sticky state before solidifying, the elastic material is pressure-bonded to form a surface rigidity reinforcing member in a two-layer form. It is a manufacturing method of the seat cushion body characterized by having 1 process and the 2nd process of laminating | stacking the said surface rigidity reinforcement member on the upper part of a flexible polyurethane foam.

  Here, in order to laminate the surface rigidity reinforcing member on the flexible polyurethane foam, a form simply placed on the surface of the flexible polyurethane foam, a form bonded to the surface of the flexible polyurethane foam via an adhesive, 3 types of forms in which the surface rigidity reinforcing member is disposed at a predetermined position of the mold during molding, and then the reactive stock solution of the flexible polyurethane foam is introduced, and the surface rigidity reinforcing member is integrally laminated on the surface of the flexible polyurethane foam. Can be appropriately selected. This is not limited to the case where the surface rigidity reinforcing member is in a two-layer form, and the same applies to the method of manufacturing a seat cushion body formed of a soft elastomer alone.

  According to the present invention, since the surface rigidity reinforcing member is laminated on the surface of the flexible polyurethane foam, the polyurethane foam suitable as the material of the seat cushion body is used as it is, and the problem that the polyurethane foam has is that the occupant is seated. In this case, the sciatic tubercle can be prevented from being intensively submerged. And the seat cushion body suitable for the sitting for a long time which reduces the low back pain resulting from this sinking, and the fatigue around a buttocks can be provided.

  As the surface rigidity reinforcing member, soft elastomer or a two-layered material in which a flexible material is laminated on a soft elastomer can be used. In addition to preventing intensive sinking into the flexible polyurethane foam, the cushioning body is also affected by the flow behavior. Relieving and dispersing the repulsive load from the body, it can also contribute to the improvement of feeling at the time of sitting.

  Hereinafter, embodiments and examples of the seat cushion body of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a view showing a seat seat to which the seat cushion body according to the first embodiment of the present invention is applied. FIG. 1 (a) is a perspective view of a seat seat with a part cut away, and FIG. These are AA sectional drawing of Fig.1 (a). FIG. 2 is a partial schematic cross-sectional view of a seat cushion body showing a tension acting on the surface rigidity reinforcing member at the time of sitting, and FIG. 3A is a perspective view of a two-layer surface composite reinforcing member provided with a through hole. 3 (b) is a cross-sectional view taken along line BB in FIG. 3 (a), and FIG. 4 (a) is a perspective view showing a state in which the two-layer surface rigidity reinforcing member having a through hole is cut into an elastic material. FIG. 4B is a cross-sectional view taken along the line CC.

  The seat 11 is mainly composed of a seat 12 on which an occupant sits, a backrest 13 having a function as the occupant's back, and a headrest 15 that protects the occupant's head.

  The seat portion 12 has a shape in which the left and right side portions are raised like a bank to comfortably hold the seating posture of the occupant, and the left and right side portions are flattened to sink from the front portion to the rear side. It is formed in an inclined state. This is to make it easy for the occupant to sufficiently abut the back against the backrest portion 13, so that the inclination of the seat portion 12 can be adjusted to an angle according to the preference of the occupant by an adjusting device (not shown). It has become. The description of the frame member provided inside the seat 12 is omitted.

  The surface of the seat 12 is covered with the skin material 16 in the same manner as the backrest. As the material of the skin material 16, synthetic leather, synthetic fiber or the like is usually used. A seat cushion body 17 is attached to the inside of the skin material 16, and a flexible polyurethane foam 18 suitable for a material as the seat cushion body 17 is conventionally used as a material constituting the seat cushion body 17.

  As shown in FIGS. 1A and 1B, a surface composite reinforcing member 20 is provided between the skin material 16 and the seat cushion body 17 on the rear portion of the flat surface of the seat portion 12 facing the backrest portion 13 side. Is provided. The surface composite reinforcing member 20 may be provided on the entire flat surface of the seat portion 12, but the backrest portion 13 of the flat surface of the seat portion 12 which is directly below the sciatic tuberature is taken into consideration in order to ensure air permeability. It is laminated on the upper part of the flexible polyurethane foam 18 at the rear part of the seat part 12 close to the side. A seat cushion body 17 is composed of the flexible polyurethane foam 18 and the surface rigidity reinforcing member 20 laminated on the upper part of the part.

  The surface rigidity reinforcing member 20 is configured as a plate-like member formed of a soft elastomer or a plate-like member obtained by laminating an elastic material on the soft elastomer. By laminating plate-shaped members made of elastic materials with cushioning properties, the elasticity rigidity of the surface rigidity reinforcing member is strengthened without increasing the hardness of the soft elastomer, and while increasing the support force of the sciatic tuberosity, This is because the repulsive load on the sciatic nodule can be dispersed by the cushioning action.

  The surface hardness of the soft elastomer forming the surface rigidity reinforcing member laminated on the upper part of the flexible polyurethane foam is such that the hardness, elongation modulus, and plate thickness of the soft elastomer are in the range of 5 to 50 degrees in Asuka C hardness. Selected. This is because it is necessary to strengthen the surface rigidity to prevent the seat surface from intensively sinking, and practically secure the support of the sciatic tuberosity while considering relaxation and dispersion of the repulsive load acting on this part. is there. Therefore, in order to obtain more effective and comfortable, the surface hardness of the soft elastomer forming the surface rigidity reinforcing member 20 in the state of being laminated on the upper part of the flexible polyurethane foam is set to the range of 10 to 35 degrees in Aska C hardness.

The soft elastomer material itself is a soft elastomer having an Asuka C hardness of 10 to 80 degrees and a 50% elongation modulus of 4.9 to 137 N / cm ² , and a thickness of 1.5 to 6.0 mm. With the soft elastomer plate, the surface hardness of the soft elastomer in a state of being laminated on the soft polyurethane foam can be in the range of 5 to 50 degrees asuka C hardness.

  The elastic material is a soft foam or a fiber body obtained by solidifying plastic fibers or natural fibers, and preferably has a thickness of 3 to 20 mm. Specifically, as the elastic material, Is a plate made of soft slab urethane foam or plastic fiber made of polyester resin, polyamide resin, polypropylene resin, acrylic resin, or natural fiber made of cotton, coconut, jute, hemp, etc. Of these, a soft slab urethane foam or a plate member of polyester fiber is preferable.

  In addition, the above-described fiber body is not particularly concerned with its form, for example, a block body formed by tangling fibers in a three-dimensional form, or a non-woven fabric formed beforehand with fibers, After laminating several sheets, it can be used as an elastic material.

  Further, the thickness of the elastic material is in the range of 3 to 20 mm as described above, but if the thickness is too thick, there is a concern about the phenomenon of sciatic tuberculosis sinking into this material. preferable.

  As shown in FIGS. 3 (a) and 3 (b), the surface rigidity reinforcing member 20 has a two-layer configuration in which a soft slab urethane foam 21 which is an elastic material is laminated on a soft urethane elastomer 22, and the surface is further increased. Through holes (13φ) may be provided on the entire surface at a predetermined pitch.

  This is because by providing a through-hole in the surface rigidity reinforcing member, it is possible to weaken the elongation rigidity without lowering the hardness and relax the support of the surface rigidity reinforcing member, and in addition, the flexible urethane elastomer becomes easy to flow. Can relieve the repulsive load on the sciatic tubercle and increase dispersibility. In consideration of a decrease in strength, the aperture ratio is preferably 45% or less in terms of area ratio, and can be appropriately determined depending on the application within this range.

  As shown in FIGS. 4 (a) and 4 (b), the polyester fiber body 28, which is an elastic material, is provided with a cut from the center of one side to the other side facing the left and right sides of the seat. . When seated, tension may be generated in the surface rigidity reinforcing member between the left and right sciatic nodules of the occupant, which may increase the feeling of repulsion to the sciatic nodules. In the case of a two-layer surface rigidity reinforcing member bonded with an elastic material, it is divided into left and right by cutting from the center of one side of the elastic material to the opposite side, so that the lateral rigidity of this part And the tension of the surface rigidity reinforcing member 20 generated between the left and right sciatic nodules of the occupant is weakened to repel the repulsive load acting on the sciatic nodules.

  Next, a method for manufacturing a seat cushion body according to the present invention will be described with reference to the drawings.

  FIG. 6 is a schematic explanatory diagram of a manufacturing method in the case where the surface rigidity reinforcing member 20 is in a two-layer form. FIG. 6A is a soft slab urethane foam (hereinafter simply referred to as “soft slab urethane”) 21 as an elastic material. The perspective view which made the notch | incision (slit) into (2), (b) is sectional drawing of the state which opened the lid | cover with the shaping | molding die of the flexible urethane elastomer 22, (c) is the state of closing the lid | cover of the same shaping | molding die It is sectional drawing.

  As shown in FIG. 6A, the soft slab urethane 21 has a long side extending from the center position on the surface in order to weaken the expansion rigidity of the left and right portions as the surface rigidity reinforcing member and relieve the repulsive load acting on the sciatic tubercle. A notch (slit) is provided toward the midpoint.

  Then, as shown in FIG. 6B, the soft slab urethane 21 is loaded inside the lid of the soft urethane elastomer mold, and the soft urethane elastomer stock solution is injected into the mold.

  When the soft urethane elastomer stock solution is injected, as shown in FIG. 6C, the lid of the mold is closed and pressed before the stock solution is solidified. Thereby, the surface rigidity reinforcement member 20 of the two-layer form by which the said 2 raw material was bonded together can be manufactured.

  More specifically, as shown in the manufacturing process diagram of the surface rigidity reinforcing member in FIG. 7, a release agent is applied to the mold (S101). At this time, the soft slab urethane 21 loaded inside the lid of the mold is prepared by block molding (S102), cutting to a desired dimension (S103), and cutting (slit) processing (S104) by punching out of the press. This is set (S105).

  Next, a soft urethane elastomer stock solution is injected into the mold (S106), and the lid is closed and pressed at a stage where the adhesiveness is high before the stock solution is solidified (S107). The surface rigidity reinforcing member 20 molded as a two-layer form is taken out (S108), and when providing a through hole, the through hole is formed by punching (S109, S110). As described above, the through hole weakens the elongation rigidity of the surface rigidity reinforcing member 20 and improves the repulsive load on the sciatic nodule and dispersibility, and can be formed as necessary. Therefore, the punching process of the through hole is omitted when the surface rigidity enhancing member has no through hole.

  In addition, a cut (slit) provided in an elastic material such as the soft slab urethane 21 can be formed as necessary. Further, the surface rigidity reinforcing member 20 may be formed of the soft urethane elastomer 22 alone without forming the surface rigidity reinforcing member 20 in the two-layer form as described above.

  Next, the outline of the manufacturing process which laminates | stacks a surface rigidity reinforcement member on a flexible polyurethane foam and makes it a cushion body is demonstrated. FIG. 8 is a process diagram for manufacturing a cushion body in which the surface rigidity is reinforced by placing or laminating a surface rigidity reinforcing member on a foamed flexible polyurethane foam by mounting or bonding. FIG. 9 is a process diagram for producing a cushion body in which the surface rigidity is reinforced by injecting a stock solution of a flexible polyurethane foam into the surface rigidity reinforcing member and integrally stacking them.

  As shown in FIG. 8, a mold release agent is applied to the mold (S201), and a raw material liquid for flexible polyurethane foam is injected (S202). Thereafter, the lid of the mold is closed and foamed (S203). After solidifying, the lid is opened and taken out (S204).

  A surface rigidity reinforcing member is placed or laminated on the taken-out flexible polyurethane foam (S205) to form a cushion body with enhanced surface rigidity (S206).

  Further, as shown in FIG. 9, after applying a release agent to the mold (S301), the surface rigidity reinforcing member is set at the lower part of the mold (S302), and a raw material liquid of flexible polyurethane foam is injected (S303). . Thereafter, the lid of the mold is closed and foamed (S304). After solidifying, the lid is opened and taken out (S305). At this time, a cushion body with enhanced surface rigidity is formed by integrally laminating the surface rigidity reinforcing member on the flexible polyurethane foam (S306).

In the production of the above-mentioned flexible polyurethane foam and flexible urethane elastomer, it is preferable to use a polyurethane high-pressure injector in order to suppress raw material loss and produce a high-quality foam (uniform cell foam).
Next, an example of a cushion body with enhanced surface rigidity manufactured by the above manufacturing methods will be described, and a comparison with a conventional product will also be described.

The surface rigidity reinforcing member in Example 1 has an Asuka C hardness of 17 degrees, a 50% elongation modulus of 7.8 N / cm ² , a 4 mm thick soft urethane elastomer in the lower layer, and a density of 314 N / m ³ . A soft slab urethane foam having a length of 8 mm is laminated so as to be an upper layer, and is formed to have a size of approximately 260 mm long × 300 mm wide.

Further, as shown in FIG. 3A, through-holes 25 having a pitch of 25 mm and φ13 mm are provided on the entire surface of the surface rigidity reinforcing member 20 and laminated on a flexible polyurethane foam (soft mold urethane foam) having an ILD hardness of 310 N / 314 cm ^2. Therefore, in this state, a seat cushion body having an Asuka C hardness of 14 degrees on the surface of the soft urethane elastomer is formed.

  The seat cushion is formed by covering the formed seat cushion body with a skin material in which a soft slab urethane foam having a thickness of 10 mm is laminated on the back surface side.

The compounding prescription of the soft urethane elastomer is in parts by weight.
Polyether polyol (2 to 3 functional groups) 100
Cross-linking agent (diethanolamine) 1.5
Amine catalyst 0.7
Isocyanate 27.7
It is.

  Isocyanate is a prepolymer of polyethylene polyphenyl polyisocyanate (MDI) (the same applies hereinafter).

  Next, a second embodiment of the seat cushion body according to the present invention will be described. In addition, the same code | symbol is attached | subjected and demonstrated to the component of the same name. FIG. 4A is a perspective view of a surface synthesis reinforcing member used in Example 2 (including Example 3 to be described later), and FIG. 4B is a cross-sectional view taken along the line CC in FIG. is there.

  As in the first embodiment, the seat cushion body according to the second embodiment also has a surface between the skin material 16 and the seat cushion body 17 at the rear portion on the backrest portion 13 side of the flat surface of the seat portion 12 as shown in FIG. A synthetic reinforcing member 20 is provided.

As shown in FIGS. 4A and 4B, the surface rigidity reinforcing member 20 in Example 2 is a soft urethane elastomer having an Asuka C hardness of 32 degrees, a 50% elongation modulus of 17.6 N / cm ² and a plate thickness of 4 mm. A stratum 22 is formed in the lower layer, a slit 27 having a density of 340 N / m ³ , a thickness of 10 mm and a width of 13 mm × 125 mm from the center of the front part of the left and right sides to the rear is formed. The polyester fiber body 28 in which the region of the part is divided into right and left is bonded as an upper layer, and is formed to have a size of approximately 260 mm long × 300 mm wide.

  Also, through-holes 25 having a pitch of 25 mm and φ13 mm are provided on the entire surface of the surface rigidity reinforcing member 20 and laminated on a flexible polyurethane foam 18 (soft molded urethane foam) having an ILD hardness of 310 N / 314 cm 2. The seat cushion body 17 having an Asuka C hardness of 24 degrees on the elastomer surface is formed.

  The seat seat 11 is formed by covering the seat cushion body 17 formed as described above with the skin material 16 in which a soft slab urethane foam having a thickness of 10 mm is laminated on the back side.

The compounding prescription of the soft urethane elastomer is in parts by weight.
Polyether polyol (2 to 3 functional groups) 100
Cross-linking agent (diethanolamine) 1.5
Amine catalyst 0.7
Isocyanate 31.3
It is.

  Next, a third embodiment of the seat cushion body according to the present invention will be described. In addition, the same code | symbol is attached | subjected and demonstrated to the component of the same name. As in the first embodiment, the seat cushion body 17 according to the third embodiment is disposed between the skin material 16 and the seat cushion body 17 at the rear portion on the backrest portion 13 side of the flat surface of the seat 12 as shown in FIG. A surface synthesis reinforcing member 20 is provided.

As shown in FIGS. 4A and 4B, the surface rigidity reinforcing member 20 in Example 3 is a soft urethane elastomer having an Asuka C hardness of 32 degrees, a 50% elongation modulus of 17.6 N / cm ² and a plate thickness of 3 mm. 22 is formed in the lower layer, a slit 27 having a density of 720 N / m ³ and a thickness of 6.5 mm and a width of 13 mm × 125 mm from the center of the front side of the left and right sides to the rear is formed. A polyester fiber body 28 in which the region of the knot portion is divided into left and right is bonded as an upper layer, and is formed to have a size of about 260 mm length × 300 mm width.

  Also, through-holes 25 having a pitch of 25 mm and φ13 mm are provided on the entire surface of the surface rigidity reinforcing member 20 and laminated on a flexible polyurethane foam 18 (soft molded urethane foam) having an ILD hardness of 310 N / 314 cm 2. The seat cushion body 17 having an Asuka C hardness of 18 degrees on the elastomer surface is formed.

  The seat seat 11 is formed by covering the formed seat cushion body 17 with a skin material 16 in which a soft slab urethane foam having a thickness of 10 mm is laminated on the back side.

The compounding prescription of the soft urethane elastomer is in parts by weight.
Polyether polyol (2 to 3 functional groups) 100
Cross-linking agent (diethanolamine) 1.5
Amine catalyst 0.7
Isocyanate 31.3
It is.

  Next, a fourth embodiment of the seat cushion body according to the present invention will be described. In addition, the same code | symbol is attached | subjected and demonstrated to the component of the same name. As in the first embodiment, the seat cushion body 17 of the fourth embodiment is also provided between the skin material 16 and the seat cushion body 17 at the rear portion of the flat portion of the seat 12 on the backrest portion 13 side, as shown in FIG. A surface synthesis reinforcing member 20 is provided.

The surface rigidity reinforcing member 20 in Example 4 has an Asuka C hardness of 53 degrees, a 50% elongation modulus of 43.1 N / cm ² , and a flexible urethane elastomer 22 having a plate thickness of 3 mm and a size of approximately 260 mm long × 300 mm wide. It is formed as a surface rigidity reinforcing member in a single layer form.

  Further, through holes 25 having a pitch of 25 mm and a diameter of 13 mm are provided on the entire surface of the surface rigidity reinforcing member 20 and laminated on a flexible polyurethane foam 18 (soft molded urethane foam) having an ILD hardness of 265 N / 314 cm 2. The seat cushion body 17 having an Asuka C hardness of 27 degrees on the elastomer surface is formed.

  The seat cushion 11 is formed by covering the formed seat cushion body 17 with a skin material 16 in which a soft slab urethane foam having a thickness of 15 mm is laminated on the back side.

The compounding prescription of the soft urethane elastomer is in parts by weight.
Polyether polyol (2 to 3 functional groups) 100
Cross-linking agent (diethanolamine) 1.5
Amine catalyst 0.7
Isocyanate 36.5
It is.
(Comparative test)
The seat seat using the seat cushion body of Examples 1 to 4 and the seat seat of the conventional specification not equipped with the surface rigidity reinforcing member are mounted on a passenger car, and the sciatic bone is evaluated by sensory evaluation in continuous running for 1 hour. A comparative test of subsidence, sciatic pressure, buttocks pain and numbness, and general fatigue is performed, and the results are shown in Table 1 below. Note Conventional specifications 1 molded urethane foam general density of the cushion body (core density: 480N / ^{m 3)} was used to the conventional specification 2 dense molded urethane as the cushion body (core density: 656N ^{/ m} 3) It was used.

結果は表１に示すように、本発明に係る座席クッション体を使用した実施例１〜４は、坐骨の沈み込みも無く、坐骨の圧迫感も無い又はあっても微弱にすぎず、また尻の痛み・痺れ、全般的な疲労感が無いという良好な結果を得られ、従来仕様のものをはるかに凌ぐものであった。

As shown in Table 1, Examples 1 to 4 using the seat cushion body according to the present invention have no sciatic sink, no sciatic pressure, or even weakness. The results were excellent, with no pain or numbness or general fatigue.

  In addition, when seated, tension may be generated between the sciatic nodules on the left and right sides of the occupant as shown in FIG. 2 to increase the feeling of resilience to the sciatic nodules. In the case of the two-layered surface rigidity reinforcing member 20, as shown in FIG. 4, the elastic material is cut from the center of one side of the elastic material having the left and right sides of the seat as both ends toward the opposite side. By dividing into two parts, it is possible to weaken the rebound load acting on the sciatic nodules by weakening the lateral rigidity of this part and weakening the tension of the surface rigidity reinforcing member generated between the left and right sciatic nodules of the occupant .

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the seat seat to which the seat cushion body of Example 1 which concerns on this invention is applied, FIG. 1 (a) is a perspective view of the seat sheet which notched one part, FIG.1 (b) is FIG. AA sectional drawing of (a). The partial schematic sectional drawing of the seat cushion body which shows the tension | tensile_strength which acts on the surface rigidity reinforcement member at the time of seating. Fig.3 (a) is a perspective view of the surface synthetic | combination reinforcement | strengthening member used for Example 1, FIG.3 (b) is the BB sectional drawing of Fig.3 (a). Fig.4 (a) is a perspective view of the surface synthetic | combination reinforcement | strengthening member used for Example 2, 3, FIG.4 (b) is CC sectional view taken on the line of Fig.4 (a). (A) is a schematic sectional drawing which shows the relationship with a human body bone | frame when a passenger | crew sits on a seat seat, (b) is a schematic sectional drawing which shows the state which the passenger | crew sank into the seat seat from the state of (a). BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic explanatory drawing about the manufacturing method in case a surface rigidity reinforcement member is a 2 layer form, (a) is the perspective view which put the cut (slit) in the soft slab urethane foam as an elastic material, (b) is soft Sectional drawing of the state which opened the lid | cover with the shaping | molding die of urethane elastomer, (c) is sectional drawing of the state which closed and shape | molded the lid | cover of the same shaping | molding die. The manufacturing process figure of a surface rigidity reinforcement member. Process drawing which manufactures the cushion body which strengthened surface rigidity by laminating | stacking a surface rigidity reinforcement member by mounting or adhesion | attachment to the soft polyurethane foam formed by foaming. Process drawing which manufactures the cushion body which inject | poured the stock solution of the flexible polyurethane foam to the surface rigidity reinforcement member, and laminated | stacked integrally, and strengthened the surface rigidity.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Seat seat 12 Seat part 13 Backrest part 15 Headrest 16 Skin material 17 Seat cushion body 18 Soft polyurethane foam 20 Surface rigidity reinforcement member 21 Soft slab urethane foam (elastic material)
22 Soft urethane elastomer (soft elastomer)
27 Incision (slit)
28 Polyester fiber (elastic material)

Claims (13)

A seat cushion body mainly made of flexible polyurethane foam,
A plate-like surface rigidity reinforcing member formed of a viscoelastic soft elastomer for reinforcing the rigidity of the seat surface is laminated on the upper portion of the flexible polyurethane foam at least on the rear surface side of the seat. Seat cushion body.   The hardness, elongation modulus, and plate thickness of the soft elastomer are selected so that the surface hardness of the surface rigidity reinforcing member in the state of being laminated on the upper part of the flexible polyurethane foam is in the range of 5 to 50 degrees in Asuka C hardness. The seat cushion body according to claim 1.   The hardness, elongation modulus, and plate thickness of the flexible elastomer are selected so that the surface hardness of the surface rigidity reinforcing member in a state of being laminated on the flexible polyurethane foam is in the range of 10 to 35 degrees in Asuka C hardness. The seat cushion body according to claim 1. The surface rigidity reinforcing member is a soft elastomer having an Asuka C hardness of 10 to 80 degrees, a 50% elongation modulus of 4.9 to 137 N / cm ² , and a thickness of 1.5 to 6.0 mm. The seat cushion body according to claim 1, wherein the seat cushion body is provided.   The seat according to any one of claims 1 to 3, wherein the surface rigidity reinforcing member is formed in a two-layer form by laminating a plate-like elastic material on the soft elastomer. Cushion body.   The seat cushion according to claim 5, wherein the elastic material is a soft foam, or a fiber body in which plastic fibers or natural fibers are three-dimensionally solidified, and has a thickness of 3 to 20 mm. body.   The seat according to claim 5 or 6, wherein the elastic material is provided with a cut from the center of one side of the elastic material having both ends on the left and right sides of the seat toward the opposite side. Cushion body.   The seat cushion body according to any one of claims 1 to 7, wherein the surface rigidity reinforcing member is provided with a plurality of through holes in an opening ratio in a range of 45% or less. A method for manufacturing a seat cushion body according to any one of claims 1 to 4,
A method of manufacturing a seat cushion body, wherein the surface rigidity reinforcing member is placed or stuck on an upper portion of the foamed flexible polyurethane foam and laminated. A method for manufacturing a seat cushion body according to any one of claims 1 to 4,
A method for producing a seat cushion body, comprising: placing a surface rigidity reinforcing member in advance on a mold of a flexible polyurethane foam; and then injecting a reactive stock solution of the flexible polyurethane foam and laminating. It is a manufacturing method of the seat cushion object according to any one of claims 5 to 7,
A first step of forming the surface rigidity reinforcing member in a two-layer form by pressure bonding the elastic material when the reactive stock solution for producing the soft elastomer is in a sticky state before solidifying; And a second step of laminating the surface rigidity reinforcing member on an upper part of the polyurethane foam.   The manufacturing of the seat cushion body according to claim 11, wherein in the second step, the surface rigidity reinforcing member is placed or stuck on an upper portion of the foamed flexible polyurethane foam. Method. The second step is characterized in that after the surface rigidity reinforcing member is placed in advance on a mold of the flexible polyurethane foam, a reactive stock solution of the flexible polyurethane foam is injected and laminated. The manufacturing method of the seat cushion body of description.

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