JP5518417B2 - Vehicle seat pad - Google Patents

Description

  The present invention relates to a vehicle seat pad, and more particularly to a seat pad with improved softness on the pad surface.

  In general, a seat pad made of a soft polyurethane foam having a high cushioning property is used for an automobile seat. The seat pad is placed on a support frame and covered with a skin material as a vehicle seat. It is configured.

  In order to obtain a soft feeling when seated in such a seat pad, there is a method in which a soft slab urethane foam is post-applied to the surface of a pad body made of foamed polyurethane foam. However, in this method, it is expensive to attach the slab, and since the slab is attached with an adhesive, there may be a quality defect such as a rise in the crevices due to poor adhesion.

  The following Patent Document 1 describes that a plurality of slits are provided in a lattice shape on the pad surface in contact with the occupant, thereby improving the softness of the surface. This slit is formed by a blade after foaming of a urethane pad. It is said that the surface can be cut or provided by the foaming mold itself. In Patent Document 2 below, a plurality of protrusions are provided in at least a part of the occupant contact surface, and in Patent Document 3 below, a plurality of recesses are provided in at least a part of the occupant contact surface. It is disclosed that by providing a hole, the surface has a soft feeling on the surface and the occupant has excellent support characteristics.

JP-A-11-348629 JP 2009-78142 A JP 2009-160371 A

  However, when the grid-like slits as described in Patent Document 1 are formed at the time of foam molding of the urethane pad, it is necessary to provide protrusions for forming the slits on the surface of the mold in the grid form. In a foaming mold having such grid-shaped protrusions, when the foaming stock solution is injected during molding, the foaming stock solution is difficult to rotate inside the lattice-shaped protrusions, resulting in a lack of molding. Cheap.

  Even when a plurality of convex portions are provided on the pad surface as in Patent Document 2, since the concave portions are provided on the surface of the foam molding die for forming the convex portions, when the foaming stock solution is injected at the time of molding. In addition, it is difficult to fill the foamed undiluted solution in each recess, and molding defects such as lack of thickness tend to occur.

  On the other hand, when a plurality of concave holes are provided on the pad surface as in the above-mentioned Patent Document 3, the problem of molding failure due to liquid surroundings during foam molding as described in the above-mentioned two documents is relatively unlikely to occur. However, when a plurality of concave holes are provided as in Patent Document 3 and the occupant abutment surface is formed by the convex stripes formed between the concave holes, the convexity is high although the soft feeling at the time of sitting is excellent. The spring constant remains low until it is compressed in the vertical direction, so that there is a problem that the occupant's body is poorly supported.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a vehicle seat pad excellent in the effect of improving the soft feeling when seated.

The vehicle seat pad according to the present invention is a vehicle seat pad made of a foamed resin molded body , wherein a plurality of independent slit-like grooves are dispersedly arranged in at least a partial region of the seating portion on the pad surface. A plurality of first slit grooves extending in a first direction on the pad surface and a plurality of second slit grooves extending in a second direction perpendicular to the first direction on the pad surface. A plurality of the first slit-shaped grooves extending in the first direction, and a plurality of the second slit-shaped grooves extending in the second direction aligned in the second direction. The rows are alternately arranged in the first direction .

  According to the present invention, since the plurality of slit-shaped grooves are provided on the pad surface, the soft feeling at the time of sitting can be improved. In addition, since the slit-like grooves are dispersedly arranged and are not connected like the lattice shape, it is difficult to cause a lack of wall due to a defective liquid around the foaming stock solution during foam molding of the seat pad, thereby improving moldability. be able to. In addition, the slit-like groove provided on the pad surface can close the slit by bending and deforming the pad surface when seated, so if the load is applied to some extent while the soft load is exerted by the slit-like groove at the initial load, Since the slit-shaped groove closes and the spring constant increases, the occupant's body can be firmly supported.

The top view of the vehicle seat pad which concerns on 1st Embodiment. An enlarged perspective sectional view of the main part of the seat pad Cross-sectional view of foam forming mold of the seat pad (A) And (b) is a schematic diagram for demonstrating the liquid flow at the time of foam molding The top view of the seat pad for vehicles concerning a 2nd embodiment. The principal part expanded sectional view of the vehicle seat pad which concerns on 3rd Embodiment (sectional drawing corresponded in the VI-VI line of FIG. 5). Sectional drawing of the foaming die in 3rd Embodiment The top view of the vehicle seat pad which concerns on 4th Embodiment

  Embodiments of the present invention will be described below with reference to the drawings.

  A seat pad 10 according to the first embodiment shown in FIG. 1 is a pad used for a seat cushion for supporting a buttocks of an occupant who is a seat in an automobile seat, and is a foam having elasticity such as a flexible polyurethane foam. It consists of a molded body.

  The seat pad 10 is composed of a seating portion 14 in the center in the width direction and side portions 16 and 16 formed so as to protrude upward on both the left and right sides. The seating portion 14 further receives and supports the occupant's buttocks. And a front thigh receiving portion 20 that receives and supports the thigh of the occupant.

  On the pad surface, that is, the upper surface of the seat pad 10, a pair of left and right vertical hanging grooves 24, 24 extending in the front-rear direction and a lateral suspension extending in the width direction are provided to lock a skin material (not shown) that covers the pad surface. A recessed groove 26 is provided. And the width direction outer side is a said side part 16 and 16 rather than a pair of vertical suspension groove | channels 24 and 24, The space | interval becomes the seating part 14. FIG. Further, the rear side of the lateral hanger 26 is the bottom part 18, and the front side is the thigh receiving part 20.

  A plurality of slit-like grooves 28 are provided on the upper surfaces of the bottom part 18 and the thigh receiving part 20 in order to improve the soft feeling of the pad surface. The plurality of slit-like grooves 28 are dispersedly arranged so as to be independent from each other without being connected to each other, that is, provided in a state where a plurality of slit-like grooves 28 are scattered in each of the bottom part 18 and the thigh receiving part 20. It has been.

  Specifically, the slit-like grooves 28 are respectively in the width direction (corresponding to the first direction) X of the seat pad 10 and the front-rear direction (corresponding to the second direction) Y perpendicular to the width direction X. A plurality are provided side by side. The slit-shaped groove 28 includes a plurality of first slit-shaped grooves 28A extending straight in the width direction X and a plurality of second slit-shaped grooves 28B extending straight in the front-rear direction Y. A plurality of first slit-shaped grooves 28A are provided side by side in the width direction X and the front-rear direction Y, and a plurality of second slit-shaped grooves 28B are also provided side by side in the width direction X and the front-back direction Y. Yes.

  In this example, in the width direction X, the first slit-shaped grooves 28A and the second slit-shaped grooves 28B are alternately arranged. Specifically, a row 34 in which a plurality of first slit-like grooves 28A extending in the width direction Y are arranged in the front-rear direction Y and a row 36 in which a plurality of second slit-like grooves 28B extending in the front-rear direction Y are arranged in the front-rear direction Y are provided. Are alternately arranged in the width direction X.

  As shown in FIG. 2 in an enlarged manner, the first slit-shaped groove 28A sandwiched between two second slit-shaped grooves 28B, 28B adjacent in the width direction X is in the front-rear direction Y of the second slit-shaped groove 28B. It is arranged so as to be sandwiched by the central part.

  The slit-like groove 28 is a narrow and relatively short groove that is recessed in the pad surface. When the seat is seated, the pad surface bends and deforms due to the load of the occupant so that the opposing wall surfaces 30 and 32 come into contact with each other. The width and depth are not particularly limited as long as the slit (gap) can be closed. Specifically, for example, the width of the slit-like groove 28 is preferably 3 to 10 mm, and the depth is preferably 5 to 30 mm. Moreover, although the length of the slit-shaped groove | channel 28 is based also on the width | variety of the slit-shaped groove | channel 28, it is preferable that it is 20-80 mm.

  When the seat pad 10 is manufactured, for example, foam molding can be performed using a foam molding die 50 as shown in FIG.

  The foaming mold 50 includes a lower mold 52 that opens upward to mold the pad surface side, and an upper mold 54 that molds the pad back surface side. The upper die 54 is provided so as to be rotatable with respect to the lower die 52 via a hinge 56 disposed on one side of the lower die 52. By opening and closing the upper surface opening of the lower die 52, A cavity 58 that is a foaming space corresponding to the pad shape is formed between the two.

  The lower mold 52 is provided with suspending groove protrusions 60 for forming the suspending grooves 24, 26, and the bottom part 18 and the thigh receiving part 20 surrounded by the suspending groove protrusions 60. A groove forming ridge 62 for forming the slit groove 28 is provided at a position corresponding to. The groove forming ridges 62 are formed in a thin plate shape so as to protrude from the mold surface of the lower mold 52, and a plurality of groove forming ridges 62 are provided independently of each other so as to correspond to the arrangement shape of the slit grooves 28 shown in FIG. It has been.

  The foaming mold 50 is used to inject a foaming stock solution into the lower mold 52 from an injection device (not shown), and the mold is closed as shown in FIG. 3 to foam-mold the seat pad 10 in the cavity 58. At this time, according to the present embodiment, since the first slit-shaped grooves 28A and the second slit-shaped grooves 28B are alternately arranged, the following effects are exhibited.

  That is, as shown in FIG. 4A, when the groove forming protrusion 62 is provided with protrusions 62A and 62A extending in the same direction close to each other, the foaming stock solution injected into the lower mold 52 is When flowing from the side of the ridge 62A as indicated by M, the foaming stock solution is difficult to flow around to the back side of the ridge 62A, that is, between the two ridges 62A and 62A as indicated by the dotted line M ′. The foaming stock solution is unlikely to flow. In order to secure the liquid periphery between the two protrusions 62A and 62A, it is necessary to increase the interval between the protrusions 62A and 62A. In this case, the interval between the slit-shaped grooves 28 to be formed also increases, and the seating is performed. It becomes difficult to show the improvement effect of the soft feeling at the time.

  On the other hand, according to the present embodiment, the first slit-like grooves 28A and the second slit-like grooves 28B are alternately arranged, so that the groove-forming protrusion 62 is formed as shown in FIG. Between the two protrusions 62A and 62A extending in the same direction, the protrusion 62B extending in a direction perpendicular to the protrusions 62A and 62A is interposed. In this case, since the interval between the two protrusions 62A, 62A in the same direction is large, the foaming stock solution can easily flow around between the two protrusions 62A and 62A as shown by the arrow M, and the moldability can be improved. In addition, since the protrusion 62B is provided between the protrusions 62A and 62A, and the slit-like groove 28 is formed thereby, the soft feeling at the time of sitting can be maintained. Accordingly, the arrangement interval of the second slit-shaped grooves 28B extending in the front-rear direction Y is widened to improve the moldability, but the first slit-shaped grooves 28A extending in the width direction X are provided between the two slit-shaped grooves 28B. The soft feeling can be maintained.

  After foaming the seat pad 10 as described above, the seat pad 10 is obtained by opening the upper mold 54 and removing the mold. The obtained seat pad 10 can form a vehicle seat by covering the pad surface with a skin material using the suspension grooves 24 and 26 and being locked.

  With the seat pad 10 according to the present embodiment configured as described above, the above-described slit-like groove 28 provided on the pad surface can improve the soft feeling when seated. Further, the slit-shaped groove 28 is closed by bending and deforming the pad surface at the time of sitting. Therefore, the slit-shaped groove 28 exhibits a soft and soft feeling by the slit-shaped groove 28 at an initial load, and when a certain load is applied. Closes and the spring constant increases, so that the passenger's body can be firmly supported.

  Further, since the slit-like grooves 28 are dispersedly arranged and are not formed in a grid-like connection shape, it is possible to make it difficult to cause a lack of wall due to a defective liquid surrounding of the foaming stock solution during foam molding of the seat pad 10. In particular, by combining the vertical and horizontal slit-shaped grooves 28 (the first slit-shaped grooves 28A and the second slit-shaped grooves 28B), the second slit-shaped grooves 28B extending in the front-rear direction Y while maintaining a soft feeling when seated. The arrangement interval can be widened to improve the surroundings of the foaming stock solution, and the moldability can be improved.

  FIG. 5 shows a seat pad 10A according to the second embodiment. In this embodiment, the size and arrangement of each slit-like groove 28 are different from those in the above embodiment.

  That is, in this example, the first slit-like groove 28A extending in the width direction X and the second slit-like groove 28B extending in the front-rear direction Y are both larger and longer than in the first embodiment. It is also set longer.

  In this example, the first slit-shaped grooves 28A and the second slit-shaped grooves 28B are alternately arranged in both the width direction X and the front-rear direction Y. Specifically, a row 38 in which a plurality of first slit-like grooves 28A extending in the width direction Y are arranged in the width direction X and a row 40 in which a plurality of second slit-like grooves 28B extending in the front-rear direction Y are arranged in the width direction X are provided. The first slit-shaped grooves 28A and the second slit-shaped grooves 28B are alternately disposed in the front-rear direction Y by being alternately disposed in the front-rear direction Y. At that time, the arrangement of the first slit-shaped grooves 28A in the front-rear direction Y and the arrangement of the second slit-shaped grooves 28B in the front-rear direction Y are alternately arranged in the width direction X. In the width direction X, the first slit-shaped grooves 28A and the second slit-shaped grooves 28B are alternately arranged.

  Other configurations are the same as those in the first embodiment. Even in this embodiment, the slit-shaped groove 28 closes the occupant's body when the load is applied to some extent while the soft load is exerted by the slit-shaped groove 28 in the initial load. It can be supported firmly. Also, by combining the vertical and horizontal slit-shaped grooves 28 (the first slit-shaped grooves 28A and the second slit-shaped grooves 28B), while maintaining the soft feeling when seated, the surroundings of the foaming stock solution are improved and the moldability is improved. Can be improved.

  FIG. 6 shows a main part of the seat pad according to the third embodiment. This embodiment is different from the above embodiment in that the slit-like groove 28 is formed in a posture inclined from a direction perpendicular to the pad surface.

  Specifically, in this example, in the seat pad 10A of the second embodiment shown in FIG. 5, the first slit-like groove 28A extending in the width direction X is inclined with respect to the pad surface as shown in FIG. This is constituted by the inclined slit-like groove 28C formed in the above. The inclined slit-like groove 28C is inclined downward and rearward so that the bottom side thereof is located on the rear end side of the seat pad 10A. In this example, the second slit-like groove 28B extending in the front-rear direction Y is formed in a posture perpendicular to the pad surface without being inclined.

  FIG. 7 shows a foam molding die 50A for molding the seat pad according to the third embodiment, and the groove forming protrusion 62C for forming the inclined slit-like groove 28C extending in the width direction X has a tip end. It protrudes in a posture inclined upward and to the anti-hinge side so as to be positioned closer to the rear end side of the pad main body 12 (that is, the side opposite to the hinge 56).

  In the third embodiment, the slit-like groove 28C is provided in an inclined manner, so that when the occupant is seated, the pad surface 42 in the vicinity of the inclined slit-like groove 28C is bent more toward the inclined pad portion 42. It becomes easy. Thus, it is possible to give directionality to the deflection of the pad surface in the vicinity of the slit-like groove 28C, that is, it is possible to stably flex the pad surface in the vicinity in one direction at the time of sitting, so that it is stable at the time of sitting. Easy to get soft feeling.

  Moreover, also from the point of formability, the moldability from the lower mold | type 52 after shaping | molding can be improved by making the groove-forming protrusion 62C incline upward and anti-hinge side as mentioned above. That is, when removing the mold, the operator removes the seat pad 10 from the anti-hinge side, so that the groove forming protrusion 62C is inclined to the anti-hinge side, so that the operator can remove the seat pad 10 from the lower mold 52. When pulling out the front, the groove-forming protrusion 62C is less likely to become an obstacle and easy to remove from the mold.

  FIG. 8 shows a seat pad 10B according to the fourth embodiment. In this embodiment, the shape of each slit-like groove 28 is different from that of the above embodiment.

  That is, in this example, the slit-shaped grooves 28D are not linear but curved, and are provided side by side in the width direction X and the front-rear direction Y on the pad surface. Specifically, the slit-like groove 28D has an integral symbol shape in which S is elongated in the vertical direction, and is provided symmetrically about the center line L in the width direction X of the seating portion 14 as an axis of symmetry. The shape of each slit-shaped groove 28D will be described in detail. The slit is a curved slit extending generally in the front-rear direction Y, the central portion in the length direction thereof is substantially linear extending in the front-rear direction Y, and the rear end portion is It is curved toward the center line L side, and the front end portion is curved toward the outside in the width direction X. Therefore, the front end side is formed in a shape away from the center line L.

  By forming the slit-shaped groove 28D in the curved shape as described above, it is possible to improve the moldability by improving the surroundings of the foamed stock solution during foam molding. In addition, since the slit-like groove 28D is provided symmetrically with a predetermined direction with respect to the center line L of the seating portion 14, it is possible to give directionality to the bending deformation at the time of sitting, A stable soft feeling can be obtained. Other configurations are the same as those in the above embodiment.

  In the above embodiment, the slit-like groove 28 is provided in both the bottom part 18 and the thigh receiving part 20, but it can also be provided in only one of them. Further, the side portion 16 may be provided with slit-shaped grooves for improving the soft feeling.

  Moreover, the dispersion | distribution arrangement | positioning form of the slit-shaped groove | channel 28, the shape of a slit-shaped groove | channel, a magnitude | size, a number, etc. are not restricted to the said embodiment, A various change is possible. For example, in the above embodiment, the slit-shaped grooves 28 are provided in a plurality of rows in the width direction X and the front-rear direction Y, respectively, but may be provided in a plurality of rows in an oblique direction. In addition, the formation direction of the first slit-shaped groove 28A and the second slit-shaped groove 28B in the first embodiment and the second embodiment is not limited to the width direction X and the front-rear direction Y as described above. A slit-shaped groove extending obliquely and perpendicular to each other may be provided in combination.

  Furthermore, in the said embodiment, although applied to the seat cushion pad for supporting a passenger | crew's buttocks, this invention can also be applied to the seat back pad which comprises a backrest part, In that case, the pad of a seat back pad What is necessary is just to provide the slit-shaped groove | channel similar to the said embodiment in the at least one part area | region of the seating part (namely, width direction center part which a passenger | crew contact | abuts) in the surface (namely, front surface). Although not enumerated one by one, various modifications can be made without departing from the spirit of the present invention.

10, 10A, 10B ... seat pad, 12 ... pad body,
14 ... sitting part, 16 ... side part,
18 ... Lower butt, 20 ... Thigh receiving part,
28 ... slit-shaped groove, 28A ... first slit-shaped groove,
28B ... second slit-shaped groove, 28C ... inclined slit-shaped groove,
28D: Curved slit-shaped groove, X: Width direction (first direction),
Y: Front-back direction (second direction)

Claims (4)

In a vehicle seat pad made of a foamed resin molded body,
A plurality of independent slit-shaped grooves are dispersedly arranged in at least a partial region of the seating portion on the pad surface ,
The plurality of slit-shaped grooves extend in a first direction on the pad surface, and the plurality of second slit-shaped grooves extend in a second direction perpendicular to the first direction on the pad surface. A plurality of the first slit grooves extending in the first direction arranged in the second direction, and the second slit grooves extending in the second direction in the second direction. A vehicular seat pad , wherein a plurality of arranged rows are alternately arranged in the first direction . The first slit-shaped groove sandwiched between two second slit-shaped grooves adjacent in the first direction is disposed so as to be sandwiched by the central portion of the second slit-shaped groove in the second direction. The vehicle seat pad according to claim 1, wherein: The rows of the first slit-shaped grooves in the first direction and the rows of the second slit-shaped grooves in the first direction are alternately arranged in the second direction. Item 1. A vehicle seat pad according to Item 1.   The vehicle seat pad according to any one of claims 1 to 3, wherein the slit groove includes an inclined slit groove formed in a posture inclined from a direction perpendicular to the pad surface. .

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