JP2019201955A - Seat pad - Google Patents

Abstract

To provide a seat pad capable of improving a feeling of riding by enlarging a stroke amount at a vibration time of a front surface layer.SOLUTION: A seat pad having a front face at a seated person side, and a rear face at an opposite side in the thickness direction to the front face, and loaded on a vehicle includes: a front surface layer forming the front face and comprising a cushioning material having air permeability; a rear surface layer forming at least a part of the rear face, integrated with the front surface layer, and comprising foam body having air permeability lower than that of the front surface layer; and a cloth member arranged at least in a part between the front surface layer and the rear surface layer, and having air permeability higher than that of the rear surface layer. There are provided through holes comprising cavities penetrating into the rear surface layer in the thickness direction, and the cloth member closes the through holes.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a seat pad, and more particularly to a seat pad that can improve riding comfort.

  A seat pad as a cushioning material is used for a seat that is mounted on a vehicle or the like and on which a seated person sits. The seat pad is integrated with a surface layer made of a flexible foam that forms the surface on the seated side and a back layer made of a non-breathable foam such as foamed polystyrene that forms the back surface. What is lightened and thinned is known (Patent Document 1).

JP-A-2018-351

  However, in the above conventional technique, the foam of the back surface layer prevents air movement caused by elastic deformation of the surface layer, so that the stroke amount of the surface layer is reduced when the vehicle vibrates and the riding comfort is deteriorated. is there.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a seat pad that can improve the riding comfort by increasing the stroke amount when the surface layer vibrates.

  In order to achieve this object, the seat pad of the present invention is mounted on a vehicle having a seated person side surface and a back surface opposite to the surface in the thickness direction, A surface layer made of a cushioning material having a surface and a breathability, and a foam having at least a part of the back surface and being integrated with the surface layer and having a lower breathability than the surface layer A back surface layer, and a cloth member that is disposed at least in part between the front surface layer and the back surface layer and has higher air permeability than the back surface layer, and penetrates the back surface layer in the thickness direction. A through hole made of a cavity is provided, and the cloth member closes the through hole.

  According to the seat pad of the first aspect, the back surface layer forming at least a part of the back surface of the seat pad is integrated with the surface layer formed of the cushioning material having air permeability by forming the surface of the seat pad. A back surface layer is formed from a foam having lower air permeability than the surface layer, and a through hole including a cavity penetrating the back surface layer in the thickness direction is provided. And the cloth member arrange | positioned in at least one part between a surface layer and a back surface layer has air permeability higher than a back surface layer, and plugs a through-hole. Thereby, the movement of the air generated by the elastic deformation of the surface layer is performed through the cloth member and the through hole, and the movement of the air can be made difficult to be hindered by the back surface layer. As a result, the amount of stroke of the surface layer can be increased during vibration of the vehicle on which the seat pad is mounted, so that the ride comfort can be improved.

  Moreover, since the through hole is closed by the cloth member disposed between the front surface layer and the back surface layer, the surface rigidity of the back surface layer around the through hole can be ensured. Thereby, when a load is applied to the seat pad from the seated person, the difference in the amount of elastic deformation of the surface layer around the through hole can be reduced, and the seat pad can be comfortably seated.

  According to the seat pad of the second aspect, the cloth member is disposed in a part between the surface layer and the back surface layer, and at least a part of the surface layer is made of a flexible foam. At a position where there is no cloth member between the front surface layer and the back surface layer, a part of the flexible foam enters the irregularities on the outer surface of the back surface layer so that the front surface layer is integrated with the back surface layer. That is, the flexible foam is foam-molded in a state where the back surface layer and the cloth member are arranged, so that the surface layer is integrated with the back surface layer. Since the through hole in the back layer is closed by the cloth member, it is possible to prevent the flexible foam that is foam-molded from entering the through hole with a simple configuration. Therefore, in addition to the effect of the first aspect, a through-hole formed of a cavity can be easily formed at the time of molding the flexible foam of the surface layer.

  According to the seat pad of the third aspect, the surface is a seating surface on which a seated person sits. The lower part of the hip which comprises the back side of a seating surface, and the lower part of the thigh which comprises the front side of a seating surface rather than the lower part of the seat. These lower buttocks and lower thighs each have a surface layer and a back layer. When the seated person sits on the seating surface, the buttocks of the seated person are supported by the bottom of the buttocks. Since the through-hole is provided in the back layer at the bottom of the bottom, it is possible to increase the stroke amount during vibration of the bottom of the bottom that easily receives a large load from the seated person. As a result, in addition to the effect of claim 1 or 2, the ride comfort can be improved.

  According to the seat pad of the fourth aspect, it is difficult for the seated person to apply a large load to the lower thigh on the front side as compared to the lower bottom on the rear side. Since the through hole is not provided in such a lower thigh, in addition to the effect of the third aspect, it is possible to secure a sense of stability of the seated person sitting on the seat pad by reducing the stroke amount during vibration of the lower thigh.

  According to the seat pad of the fifth aspect, at least a part of the through-hole is provided in the lower part of the butt at symmetrical positions separated from the center in the left-right direction by 50 mm to 80 mm in the left-right direction. Thereby, since a through-hole is provided in the lower part of the bottom corresponding to the position immediately below the two sciatic nodules of the seated person, the stroke amount during vibration of the lower part of the bottom of the part that easily receives a large load from the seated person can be increased. . As a result, in addition to the effect of the third or fourth aspect, the ride comfort can be further improved.

It is a top view of the seat pad in a 1st embodiment of the present invention. It is sectional drawing of the seat pad in the II-II line of FIG. It is a bottom view of a seat pad. (A) is explanatory drawing which shows the state which attached the back surface layer to the metal mold | die, (b) is explanatory drawing which shows the state which shape | molded the seat pad. It is explanatory drawing which shows the state which shape | molded the seat pad with the metal mold | die which abbreviate | omitted the protrusion. It is a bottom view of the seat pad in a 2nd embodiment. It is a bottom view of the seat pad in a 3rd embodiment. (A) is explanatory drawing which shows the state which shape | molded the seat pad, (b) is explanatory drawing which shows the state which shape | molded the seat pad in 4th Embodiment.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. First, the seat pad 1 according to the first embodiment of the present invention will be described with reference to FIG. 1, FIG. 2, and FIG. FIG. 1 is a plan view of the seat pad 1. 2 is a cross-sectional view of the seat pad 1 taken along the line II-II in FIG. FIG. 3 is a bottom view of the seat pad 1. Arrow U, arrow D, arrow L, arrow R, arrow F, and arrow B in each drawing indicate the upward, downward, leftward, rightward, forward, and backward directions of the seat pad 1, respectively. The vertical direction, the horizontal direction, and the front-rear direction of the seat pad 1 are substantially the same as the vertical direction, the horizontal direction, and the front-rear direction of the seated person H seated on the seat pad 1. In each drawing, each part of seat pad 1 is typically shown. In each drawing, the thickness of the cloth member 18 is exaggerated.

  As shown in FIGS. 1 and 2, the seat pad 1 is used as a cushion material for a seat on which a seated person H is seated. The seat pad 1 is provided in a seating portion of a seat for a rear seat, a driver seat, and a passenger seat mounted on a vehicle with vibration. The seat pad 1 has a front surface 4 on the seated person H side in the thickness direction (arrow UD direction) and a back surface 5 on the opposite side to the front surface 4 in the thickness direction. The surface 4 of the seat pad 1, which is a seating portion of the seat, is a seating surface that receives a load from the seated person H, and is a part that is covered with a skin material (not shown). The back surface 5 is a part supported from below by a vehicle body floor or a frame (not shown).

  The seat pad 1 includes a bottom part 10 that forms the rear (arrow B) side of the seat pad 1, a thigh part 14 that forms the front (arrow F) side of the bottom part 10, and a bottom part 10 and a thigh part 14. Side support 6 provided on each of the left and right sides. The side support 6 is a part that supports the buttocks and thighs of the seated person H from the side, and is integrally formed with the lower buttocks 10 and the lower thighs 14.

  The bottom part 10 is a part which supports the buttocks of the seated person H from below. The lower thigh 14 is a part that supports the thigh of the seated person H from below. The bottom part 10 includes a surface layer 11 that forms the surface 4 and a back surface layer 12 that forms a part of the back surface 5 and is integrated with the surface layer 11, and is provided between the surface layer 11 and the back surface layer 12. The cloth member 18 is disposed in part. The thigh lower part 14 includes a surface layer 15 that forms the front surface 4 and a back surface layer 16 (see FIG. 3) that forms a part of the back surface 5 and is integrated with the surface layer 15. The surface layers 11 and 15 are also provided around the front and rear, left and right of the back surface layers 12 and 16.

  The surface layer 11 and the surface layer 15 are integral members made of a flexible foam (cushion material) such as a flexible polyurethane foam, and have air permeability. The back surface layer 12 and the back surface layer 16 are an integral member made of a non-breathable foam such as expanded polystyrene. The back surface layers 12 and 16 are set to be harder and have a lower specific gravity than the front surface layers 11 and 15. Therefore, compared to the case where the seat pad 1 is made only of a flexible foam, the back surface layer 16 makes it difficult for the seated person H to feel the hardness of the frame or the like even when the seat pad 1 is thinned, and the seat pad 1 can be reduced in weight. .

  As shown in FIGS. 2 and 3, the bottom portion 10 is provided with a through-hole 17 formed of a cavity having a circular cross section that penetrates the back surface layer 12 in the thickness direction. Further, the through hole 17 is not provided in the back surface layer 16 of the thigh lower part 14. In addition, the boundary B of the back surface layer 12 and the back surface layer 16 is shown by the dashed-dotted line in FIG.

  The through holes 17 are respectively provided at positions corresponding to right under the left and right sciatic nodule portions T1 and T2 of the seated person H sitting on the seat pad 1. The interval between the sciatic nodules T1 and T2 is generally included between 100 mm and 160 mm. Therefore, it is preferable to provide at least a part of the through-hole 17 at symmetrical positions 50 mm to 80 mm apart from the center C in the left-right direction of the back surface layer 12 of the bottom portion 10 in the left-right direction (arrow LR direction).

  The through-hole 17 has a constant inner diameter L1 over the thickness direction of the seat pad 1, and the inner diameter L1 is set to 50 mm to 150 mm. Therefore, even if the center position of the through-hole 17 and the position of the sciatic nodule portions T1 and T2 are shifted, the through-hole 17 can be easily arranged immediately below the sciatic nodule portions T1 and T2.

  The cloth member 18 is a woven or knitted fabric such as a coarse blanket. The cloth member 18 has higher air permeability than the back surface layers 12 and 16 and is set so as not to pass the foaming stock solution that forms the flexible foam of the surface layers 11 and 15. The cloth member 18 is disposed so as to close the two through holes 17.

  Next, a method for manufacturing the seat pad 1 will be described with reference to FIGS. 4 (a) and 4 (b). FIG. 4A is an explanatory view showing a state in which the back surface layers 12 and 16 are mounted on the mold 20. FIG. 4B is an explanatory view showing a state in which the seat pad 1 is molded.

  As shown in FIG. 4A, the back surface layers 12 and 16 are mounted on the molding surface 24 of the upper mold 23 with the upper mold 23 being opened with respect to the lower mold 21 of the mold 20. A cloth member 18 that closes the through hole 17 is attached to the back surface layers 12 and 16 in advance by adhesion or the like. When the molding surface 24 is attached to the upper mold 23, the protrusion 25 protruding from the molding surface 24 of the upper mold 23 is fitted into the through hole 17. Thereby, the back surface layers 12 and 16 are positioned and fixed with respect to the upper mold 23. The height of the protrusion 25 is set to be substantially the same as the thickness of the back surface layer 12 around the through hole 17, and is set so that the tip of the protrusion 25 contacts the cloth member 18.

  Next, the foaming stock solution is injected into the molding surface 22 of the lower mold 21 to close the lower mold 21 and the upper mold 23. Then, the foamed stock solution is foamed to foam-mold the surface layers 11 and 15 made of flexible foam. Thereby, in the position where the cloth member 18 is not attached to the back surface layers 12 and 16, a part of the flexible foam of the surface layers 11 and 15 enters the irregularities on the outer surface of the back surface layers 12 and 16. 15 and the back surface layers 12 and 16 are integrated, and the seat pad 1 is manufactured.

  Since the through-hole 17 is blocked by the cloth member 18 that does not allow the flexible foam to pass through, it is possible to prevent the soft foam that is foam-molded from entering the through-hole 17 with a simple configuration. Therefore, when the surface layers 11 and 15 and the back surface layers 12 and 16 are integrated at the time of molding the flexible foam of the surface layers 11 and 15, the through-hole 17 formed of a cavity can be easily formed.

  According to the seat pad 1 as described above, when vibration occurs in the vehicle with the seated person H seated on the seat pad 1, the surface layers 11 and 15 made of flexible foam are elastic to attenuate the vibration from the vehicle. Deformation causes air to enter and exit the surface layers 11 and 15. Since the through-hole 17 is provided in the back surface layer 12 which is a non-breathable foam, and the through-hole 17 is closed with the cloth member 18 having higher air permeability than the back-surface layer 12, the cloth member 18 and the through-hole 17 are closed. Air movement caused by elastic deformation of the surface layer 11 is performed. Thereby, the movement of the air can be made difficult to be prevented by the back surface layer 12. Therefore, the amount of stroke of the surface layer 11 can be increased (the resonance magnification of the bottom part 10 is increased) when the vehicle vibrates due to road irregularities and the like, and therefore the influence on the internal organs of the seated person H due to vibration can be particularly reduced. That is, compared with the case where the surface layer 11 does not have the through hole 17, the through hole 17 and the cloth member 18 can increase the stroke amount when the surface layer 11 vibrates and can be seated on the seat pad 1 mounted on the vehicle. You can improve the ride comfort.

  In particular, when the bottom surface 10 is thinned to about 40 mm to 70 mm by superposing the soft surface layer 11 on the hard back layer 12 and the bottom bottom 10 has a small resonance magnification, vibration from the vehicle to the seated person H is reduced. 10 may not be sufficiently attenuated. However, since the resonance magnification of the bottom part 10 can be increased by the through-hole 17, the ride comfort can be improved even if the bottom part 10 is thinned.

  If the inner diameter L1 of the through hole 17 is 30 mm or more (in this embodiment, 50 mm to 150 mm), the through hole 17 increases the amount of deflection of the surface layer 11 when the seated person H is seated on the seat pad 1. be able to. Thereby, the pressure received by the seated person H from the surface layer 11 can be dispersed, and the seating comfort of the seat pad 1 can be improved.

  In addition, the larger the inner diameter L1 of the through hole 17, the greater the amount of deflection of the surface layer 11, and the better the seating comfort of the seat pad 1. Furthermore, when the through hole 17 having an inner diameter L1 of 30 mm or more is provided at a position where a large load is easily received from the seated person H, the amount of deflection of the surface layer 11 can be increased, and the seating comfort of the seat pad 1 can be improved.

  The coarser the cloth member 18 is, the better the air permeability of the cloth member 18 is, and the easier it is to move the air generated by the elastic deformation of the surface layer 11. Therefore, the more comfortable the cloth member 18 is, the more comfortable it is to ride.

  Further, since the through hole 17 is closed by the cloth member 18 disposed between the front surface layer 11 and the back surface layer 12, the surface rigidity of the back surface layer 12 around the through hole 17 can be secured by the cloth member 18. As a result, when a load is applied from the seated person H to the seat pad 1 during sitting, the difference in the amount of elastic deformation of the surface layer 11 around the through hole 17 can be reduced and the edge of the through hole 17 can be felt by the seated person H. Therefore, the seat pad 1 can be comfortably seated.

  Since the through-hole 17 is hollow, air generated by elastic deformation of the surface layer 11 can be easily moved as compared with the case where a part of the surface layer 11 enters at least a part of the through-hole 17 in the thickness direction. As a result, the amount of stroke during vibration of the surface layer 11 can be increased to improve riding comfort.

  The through-hole 17 is provided in the back surface layer 12 of the bottom part 10 that easily receives a large load from the seated person H. Therefore, since the stroke amount at the time of vibration of the bottom part 10 which is easy to receive a big load from the seated person H can be increased, riding comfort can be improved.

  In particular, the largest load is applied to the lower buttocks 10 from the sciatic nodule portions T1 and T2 of the seated person H. Since at least a part of the through-hole 17 is provided at symmetrical positions 50 mm to 80 mm apart from the center C in the left-right direction of the bottom part 10 in the left-right direction, it corresponds to a position immediately below the sciatic nodules T1, T2 of the seated person H. A through-hole 17 is arranged at the bottom 10 of the position. Since the stroke amount at the time of vibration of the lower buttocks 10 of the portion that is likely to receive the largest load from the seated person H can be increased, the riding comfort can be further improved.

  Since the inner diameter L1 of the through-hole 17 is set to 50 mm to 150 mm, the through-hole 17 is positioned immediately below the sciatic nodule portions T1 and T2 even if there are individual differences in the position of the sciatic nodule portions T1 and T2 of the seated person H. Easy to do. Thereby, it is possible to easily improve the sitting comfort of the seat pad 1. Furthermore, since the inner diameter L1 of the through hole 17 is set to 50 mm or more, air can be easily moved through the through hole 17 when the surface layer 11 is elastically deformed. As a result, the amount of stroke during vibration of the surface layer 11 can be increased to improve riding comfort.

  The inner diameter L1 of the through hole 17 is preferably set to 100 mm or more. In this case, the through-hole 17 can be more easily positioned immediately below the sciatic nodule portions T <b> 1 and T <b> 2, and air can be further easily moved through the through-hole 17. As a result, riding comfort can be further improved.

  Compared with the lower buttocks 10 that supports the buttocks of the seated person H, the thigh lower part 14 that supports the thigh of the seated person H is less likely to receive a large load from the seated person H. Since the through-hole 17 is not provided in the back surface layer 16 of such a thigh lower part 14, the stroke amount at the time of the vibration of the thigh lower part 14 can be comparatively reduced, and the sense of stability of the seated person H sitting on the seat pad 1 is ensured. it can.

  Furthermore, since the through-hole 17 is not provided in the back surface layer 16 of the thigh lower part 14 of the seat pad 1 mounted in a vehicle, the thigh lower part 14 can be prevented from becoming too soft. As a result, a submarine phenomenon in which the seated person H slides forward with respect to the seat pad 1 at the time of a vehicle collision or the like can be made difficult to occur.

  In the present embodiment, the protrusion 25 provided on the upper mold 23 of the mold 20 is fitted in the through hole 17, and the surface layer 11 is formed in a state where the tip of the protrusion 25 is in contact with the cloth member 18. Therefore, it is possible to prevent the cloth member 18 from being bent toward the back surface 5 in the through hole 17 by being pressed by the surface layer 11 to be foam-molded. Thereby, it is possible to suppress the seated person H from feeling uncomfortable due to the cloth member 18 becoming hard due to the bending of the cloth member 18.

  As shown in FIG. 5, the surface layer 11 may be foam-molded in a state where the protrusions 25 are not provided on the upper mold 27 of the mold 26 and the through holes 17 are hollow. In this case, the cloth member 18 is pressed toward the back surface 5 in the through hole 17 by being pressed by the surface layer 11 to be foam-molded. Although a part of the cloth member 18 and the surface layer 11 slightly enters the through-hole 17, in this specification, the through-hole 17 is defined as a cavity even in this case. By bending the cloth member 18 toward the back surface 5 in the through hole 17, the surface area of the cloth member 18 facing the through hole 17 where air can easily enter and exit can be increased. Thereby, since air can be more easily moved through the through-hole 17 and the cloth member 18, riding comfort can be improved more.

  Next, a second embodiment will be described with reference to FIG. In the first embodiment, the case where two relatively large through holes 17 are provided in the back surface layer 12 of the bottom part 10 has been described. On the other hand, 2nd Embodiment demonstrates the case where the comparatively small several through-hole 32 is provided in the back surface layer 31 of the bottom part 10. In addition, about the part same as 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted. FIG. 6 is a bottom view of the seat pad 30 in the second embodiment. The seat pad 30 according to the second embodiment is the same as the seat pad 1 according to the first embodiment except that the configuration of the back surface layer 31 and the through hole 32 of the bottom portion 10 is different. is there.

  As shown in FIG. 6, the back surface layers 16 and 31 of the seat pad 30 are integral members made of a non-breathable foam such as polystyrene foam. The back layer 31 is a part of the bottom part 10 that supports the buttocks of the seated person H. A plurality of through holes 32 each having a circular cross section are formed through the back surface layer 31 in the thickness direction. The plurality of through holes 32 are closed by the cloth member 18 between the back surface layer 31 and the surface layer 11.

  The plurality of through-holes 32 are provided in imaginary circles 33 and 34 at symmetrical positions separated from the center C of the back surface layer 31 in the left-right direction. The diameter L2 of the virtual circles 33 and 34 is set to about 50 mm to 150 mm. The inner diameter L3 of the through hole 32 is constant over the thickness direction and is set to about 6 to 20 mm. An interval L4 between the through holes 32 is set to about 6 mm to 20 mm.

  The distance and the position between the virtual circles 33 and 34 are set so that the virtual circles 33 and 34 are located immediately below the left and right sciatic nodule portions T1 and T2 of the seated person H sitting on the seat pad 30. That is, at least a part of the virtual circles 33 and 34 (a plurality of through holes 32) are provided at symmetrical positions separated from the center C of the back surface 31 in the left-right direction by 50 mm to 80 mm.

  According to the seat pad 30 as described above, similarly to the seat pad 1 of the first embodiment, the movement of the air caused by the elastic deformation of the surface layer 11 made of flexible foam is a non-breathable foam. This is performed through the through hole 32 provided in the layer 31 and the cloth member 18 having higher air permeability than the back surface layer 31. Thereby, the movement of the air can be made difficult to be prevented by the back surface layer 31. As a result, it is possible to improve the riding comfort by increasing the stroke amount during vibration of the surface layer 11.

  At least a part of virtual circles 33 and 34 is provided at symmetrical positions 50 mm to 80 mm apart from the center C in the left-right direction of the back surface layer 31, and a plurality of through holes 32 are provided in the virtual circles 33 and 34. ing. As a result, a plurality of through holes 32 can be provided in the lower buttocks 10 at a position corresponding to the position immediately below the sciatic nodule portions T1 and T2 of the seated person H. The stroke amount at the time of 10 vibrations can be increased. As a result, the ride comfort can be improved.

  Since the diameter L2 of the virtual circles 33 and 34 is set to 50 mm to 150 mm, even if there is an individual difference in the position of the sciatic nodules T1 and T2 of the seated person H, the lower buttocks just below the sciatic nodules T1 and T2 It is easy to position a plurality of through holes 32 at 10. Thereby, riding comfort can be improved easily. In particular, the diameter L2 of the virtual circles 33 and 34 is preferably set to 100 mm or more. In this case, the plurality of through holes 32 can be more easily positioned in the lower buttocks 10 immediately below the sciatic nodule portions T1 and T2, and air can be easily moved through the plurality of through holes 32 when the surface layer 11 is elastically deformed. . As a result, riding comfort can be further improved.

  Since the inner diameter L3 of the through hole 32 is relatively small, about 6 mm to 20 mm, the crushed surface layer 11 and the cloth member when the seated person H sits on the seat pad 30 as compared with the case where the inner diameter L3 of the through hole 32 is large. It is possible to make it difficult for the seated person H to feel the edge of the through-hole 32 through 18. Since a plurality of such through holes 32 are provided in the back surface layer 31, air can be sufficiently moved through the through holes 32. As a result, the seating comfort and riding comfort of the seat pad 30 can be improved.

  Since the distance L4 between the through holes 32 is set to about 6 mm to 20 mm, the number of the through holes 32 in the virtual circles 33 and 34 can be increased, and air can be easily moved through the through holes 32. Furthermore, it is preferable to set the distance L4 to 15 mm or less, and it is more preferable to set the distance L4 to 10 mm or less. As the distance L4 is reduced, the number of through holes 32 in the virtual circles 33 and 34 can be increased, and air can be more easily moved through the plurality of through holes 32. As a result, the ride comfort can be improved.

  Further, by making the distance L4 substantially the same as the inner diameter L3 of the through-hole 32, a sufficient ratio of the through-holes 32 in the virtual circles 33 and 34 can be secured, and the air can be easily moved through the plurality of through-holes 32. it can. As a result, the ride comfort can be improved.

  Next, a third embodiment will be described with reference to FIG. 7 and FIG. In 1st Embodiment, the case where the through-hole 17 was not provided in the back surface layer 16 of the thigh lower part 14 was demonstrated. In contrast, in the third embodiment, a case where a through hole 44 is provided in the back surface layer 42 of the thigh lower part 14 will be described. In addition, about the part same as 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted. FIG. 7 is a bottom view of the seat pad 40 in the third embodiment. FIG. 8A is an explanatory view showing a state in which the seat pad 40 is molded. In FIG. 7, the edge of the end portion of the through hole 43 on the surface layer 11 side is indicated by a broken line.

  As shown in FIGS. 7 and 8A, the seat pad 40 is used as a cushioning material in a seating portion of a vehicle seat. The seat pad 40 has a front surface 4 on the seated person H side in the thickness direction (arrow UD direction) and a back surface 5 on the opposite side of the thickness direction with respect to the front surface 4.

  The bottom portion 10 of the seat pad 40 includes a surface layer 11 that forms the front surface 4 and a back surface layer 41 that forms a part of the back surface 5 and is integrated with the surface layer 11. The lower thigh 14 of the seat pad 40 includes a front surface layer 15 that forms the front surface 4 and a back surface layer 42 that forms a part of the back surface 5 and is integrated with the front surface layer 15. The cloth member 18 is disposed in a part between the front surface layer 11 and the back surface layer 41. A cloth member 49 is disposed in a part between the front surface layer 15 and the back surface layer 42.

  The back surface layer 41 and the back surface layer 42 are an integral member made of a non-breathable foam such as expanded polystyrene. The back surface layer 41 is provided with two through-holes 43 made of a circular cavity having a circular cross section that penetrates the back surface layer 41 in the thickness direction, and a through-hole 45 made of a cavity that penetrates the back surface layer 41 in the thickness direction. . The back surface layer 42 is provided with a plurality of through-holes 44 formed of cavities having a circular cross section that penetrates the back surface layer 42 in the thickness direction.

  At least a part of the through-hole 43 is provided at a symmetrical position that is 50 mm to 80 mm away from the center C of the back surface layer 41 in the left-right direction. That is, the through-holes 43 are provided at positions corresponding to right under the left and right sciatic nodule portions T1 and T2 of the seated person H sitting on the seat pad 40, respectively.

  The inner diameter of the through-hole 43 is gradually increased from the back surface 5 toward the front surface 4. The through hole 43 has a minimum inner diameter L5 on the back surface 5 set to 50 mm to 150 mm. In the through hole 43, the maximum inner diameter L6 on the surface 4 side is set to 1.1 to 1.5 times the minimum inner diameter L5.

  The through holes 45 are provided so as to divide the back surface layer 41 in the front-rear direction at the positions of the two through holes 43. That is, the through-hole 45 connects the through-holes 43 and opens to the outer surface in the left-right direction of the back surface layer 41. The through holes 43 and 45 are closed by the cloth member 18. By attaching the cloth member 18 to the back surface layer 41 divided by the through holes 43 and 45, the separated back surface layers 41 are connected to each other via the cloth member 18.

  The through hole 44 has an inner diameter L7 that is constant over the thickness direction, and is set to about 6 mm to 20 mm. The plurality of through holes 44 are provided in two rows in the front-rear direction. The space | interval L8 of the left-right direction between the some through-holes 44 and the space | interval L9 of the front-back direction between the through-holes 44 are each set to about 6 mm-20 mm. In the present embodiment, the interval L9 is set larger than the interval L8, but the interval L8 and the interval L9 may be made the same, or the interval L9 may be made smaller than the interval L8.

  The cloth member 49 is a woven or knitted fabric such as a coarse blanket similar to the cloth member 18. The cloth member 49 has air permeability and is set so as not to pass the foaming stock solution that forms the flexible foam of the surface layers 11 and 15. The cloth member 49 is disposed so as to close the plurality of through holes 44.

  As shown in FIG. 8A, in order to manufacture the seat pad 40, the back layers 41 and 42 are first attached to the molding surface 24 of the upper mold 47 of the mold 46 with the mold 46 opened. The cloth members 18 and 49 that close the through holes 43, 44, and 45 are attached to the back surface layers 41 and 42 in advance by adhesion or the like. Further, the upper die 47 is provided with a protrusion 25 that is inserted into the through hole 43 of the back surface layer 41 and a protrusion 48 that fits into the through hole 44 of the back surface layer 42. The protrusion 25 is a columnar member having the same outer diameter as the minimum inner diameter L <b> 5 of the through hole 43. By bringing the protrusion 48 into contact with the cloth member 49, it is possible to prevent the cloth member 49 from being bent toward the back surface 5 side during foam molding of the surface layers 11 and 15.

  The foaming stock solution is injected into the molding surface 22 of the lower mold 21 to close the lower mold 21 and the upper mold 47, and the foaming stock solution is foamed to foam-mold the surface layers 11, 15 made of flexible foam. Thereby, the surface layers 11 and 15 and the back surface layers 41 and 42 are integrated, and the seat pad 40 is manufactured.

  Since the through holes 43, 44, 45 are closed by the cloth members 18, 49 that do not allow the flexible foam to pass through, it is possible to prevent the soft foam that is foam-molded from entering the through holes 43, 44, 45 with a simple configuration. . Therefore, when the surface layers 11 and 15 and the back surface layers 41 and 42 are integrated at the time of molding the flexible foam of the surface layers 11 and 15, the through holes 43, 44, and 45 that are cavities can be easily formed.

  According to the seat pad 40 as described above, the air movement caused by the elastic deformation of the surface layer 11 made of the flexible foam is a non-breathable foam as in the seat pad 1 of the first embodiment. This is performed through the through holes 43 and 45 provided in the layer 41 and the cloth member 18 having higher air permeability than the back layer 41. Thereby, the movement of the air can be made difficult to be prevented by the back surface layer 41. As a result, it is possible to improve the riding comfort by increasing the stroke amount during vibration of the surface layer 11.

  Since the through-hole 45 opens to the outer surface in the left-right direction of the back surface layer 41, air can be moved between the surface layer 11 and the outer surface in the left-right direction when the surface layer 11 is elastically deformed. Thereby, since the movement of the air which arises by the elastic deformation of the surface layer 11 can be made easy, riding comfort can be improved.

  Further, since the through-hole 45 is provided so as to divide the back surface layer 41 in the front-rear direction at the position of the two through-holes 43 (sciatic nodules T1, T2), the seated person H shifts to the left and right. The through holes 43 and 45 can be easily positioned just below the sciatic nodules T1 and T2. Since the stroke amount at the time of vibration of the lower buttocks 10 of the portion that is likely to receive the largest load from the seated person H can be increased, the riding comfort can be further improved.

  A through hole 44 is provided in the back surface layer 42 of the lower thigh 14, and the through hole 44 is closed by a cloth member 49 having a higher air permeability than the back surface layer 42. Thereby, the movement of the air caused by the elastic deformation of the surface layer 15 of the thigh lower part 14 is performed through the through hole 44 and the cloth member 49, and the movement of the air can be hardly disturbed by the back surface layer 42. As a result, the stroke amount during vibration of the surface layer 15 of the lower thigh 14 can be increased, so that the ride comfort can be improved.

  A plurality of through holes 44 having a relatively small inner diameter L7 of about 6 mm to 20 mm are provided in the back surface layer 42 of the lower thigh 14. Further, the back surface layer 42 can be prevented from becoming too soft by relatively reducing the number of through holes 44, such as providing a plurality of through holes 44 in the back surface layer 42 in two rows in the front-rear direction. Thereby, even if the through-hole 44 is provided in the back surface layer 42 of the thigh lower part 14, the submarine phenomenon can be hardly generated at the time of a vehicle collision or the like.

  The distance L8 in the left-right direction between the through holes 44 arranged in the left-right direction is set to be the same. Thereby, even if the seated person H slides the thigh from side to side on the thigh lower part 14, the feeling that the thigh receives from the thigh lower part 14 can be made substantially the same. Further, since the front-rear direction interval L9 between the through holes 44 is larger than the left-right direction interval L8 between the through-holes 44, the rigidity of the thigh lower part 14 with respect to the load in the front-rear direction applied to the thigh lower part 14 is relatively large. it can. As a result, it is possible to suppress the deformation of the thigh lower part 14 by applying a load in the front-rear direction to the thigh lower part 14 at the time of the collision of the vehicle.

  Since the through hole 44 is closed by the cloth member 49 between the surface layer 15 and the back surface layer 42, the surface rigidity of the back surface layer 42 around the through hole 44 can be secured by the cloth member 49. Thus, when a load is applied from the seated person H to the seat pad 40 when sitting, the difference in elastic deformation of the surface layer 11 around the through hole 44 can be reduced and the edge of the through hole 44 can be felt by the seated person H. Therefore, the seat pad 40 can be comfortably seated. Furthermore, by ensuring the surface rigidity of the back surface layer 42 around the through hole 44 by the cloth member 49, the submarine phenomenon can be made difficult to occur.

  Since the inner diameter of the through-hole 43 is gradually reduced from the front surface 4 side toward the rear surface 5 side, when the seated person H sits on the seat pad 40, the edge of the through-hole 43 is seated via the crushed surface layer 11 It can be difficult for the person H to feel. As a result, the seating comfort of the seat pad 40 can be improved.

  Since the through hole 43 has a maximum inner diameter L6 on the front surface 4 side than a minimum inner diameter L5 on the back surface 5 side, air can be easily moved through the through hole 43. The larger the maximum inner diameter L6, the easier the air can move through the through hole 43.

  In the present embodiment, since the maximum inner diameter L6 is set to 1.1 times or more of the minimum inner diameter L5, air can be sufficiently moved through the through hole 43. The maximum inner diameter L6 is preferably set to 1.3 times or more of the minimum inner diameter L5. In this case, air can be more easily moved through the through hole 43. When the maximum inner diameter L6 is larger than 1.5 times the minimum inner diameter L5, the ease of air movement hardly changes even if the magnification is increased, but it is difficult to form the through hole 43. Therefore, by setting the maximum inner diameter L6 to 1.5 times or less of the minimum inner diameter L5, both the ease of air movement through the through hole 43 and the ease of forming the through hole 43 can be achieved.

  Next, a fourth embodiment will be described with reference to FIG. In the third embodiment, the through-hole 43 whose inner diameter is gradually reduced from the back surface 5 toward the front surface 4 has been described. In contrast, in the fourth embodiment, a case where the through hole 52 has a small diameter portion 53 and a large diameter portion 54 will be described. In addition, about the part same as 1st, 3rd embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted. FIG.8 (b) is explanatory drawing which shows the state which shape | molded the seat pad 50 in 4th Embodiment. The bottom view of the seat pad 50 is substantially the same as the bottom view (FIG. 7) of the seat pad 40 in the third embodiment.

  As shown in FIG. 8B, the back layer 51 of the bottom part 10 of the seat pad 50 is made of a non-breathable foam such as polystyrene foam, and is integrally formed with the back layer 42 of the thigh lower part 14. The back surface layer 51 is provided with through holes 45 and 52 formed of cavities penetrating the back surface layer 51 in the thickness direction.

  At least a part of the through hole 52 is provided at a symmetrical position that is 50 mm to 80 mm away from the center C (see FIG. 7) in the left-right direction of the back layer 51. That is, the through hole 52 is provided at a position corresponding to a position immediately below the left and right sciatic nodule portions T1 and T2 of the seated person H sitting on the seat pad 50.

  The through hole 52 includes a small-diameter portion 53 on the back surface 5 side and a large-diameter portion 54 that continues above the small-diameter portion 53 (on the front surface 4 side). The small diameter portion 53 has an inner diameter L5 that is constant over the thickness direction, and is set to about 50 mm to 150 mm. The large diameter portion 54 is a portion having an inner diameter larger than that of the small diameter portion 53. The large-diameter portion 54 is expanded in a step shape with respect to the small-diameter portion 53 and gradually increases in diameter toward the surface 4. The maximum inner diameter L6 of the large diameter portion 54 is set to 1.1 to 1.5 times the inner diameter L5.

  According to the seat pad 50 as described above, the movement of air caused by the elastic deformation of the surface layers 11 and 15 made of the flexible foam is non-breathable, like the seat pads 1 and 40 of the first and third embodiments. This is carried out through the through holes 44, 45, 52 provided in the back surface layers 42, 51, which are the foams, and the cloth members 18, 49 having higher air permeability than the back surface layers 42, 51. Thereby, the movement of the air can be made difficult to be prevented by the back surface layers 42 and 51. As a result, the amount of stroke during vibration of the surface layers 11 and 15 can be increased to improve riding comfort.

  Since the inner diameter of the large-diameter portion 54 on the surface 4 side is larger than the inner diameter L5 of the small-diameter portion 53, air can be more easily moved through the through hole 52. Moreover, the stroke amount at the time of vibration of the surface layer 11 around the small diameter portion 53 can be increased according to the dimension of the large diameter portion 54 in the arrow UD direction. Therefore, by providing the large-diameter portion 54 and appropriately setting the shape and dimensions of the large-diameter portion 54, the stroke amount during vibration of the surface layer 11 around the small-diameter portion 53 can be adjusted, and riding comfort can be adjusted appropriately.

  The present invention has been described above based on the embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed. For example, the overall shape and dimensions of the seat pads 1, 30, 40 and 50, and the shapes and dimensions of the front surface layers 11 and 15, the back surface layers 12, 16, 31, 41, 42 and 51, the cloth members 18 and 49, etc. Can be set. Further, the two through holes 17 may be closed with separate cloth members 18. The plurality of through holes 32 and 44 may be closed by the plurality of cloth members 18 and 49. You may arrange | position the cloth members 18 and 49 in the whole between the surface layers 11 and 15 and the back surface layers 12, 16, 31, 41, 42, and 51. FIG.

  The surface layers 11 and 15 are positioned around the front, back, left and right of the back surface layers 12, 16, 31, 41, 42 and 51, and the back surface layers 12, 16, 31, 41, 42 and 51 form part of the back surface 5. However, the entire back surface 5 may be formed by the back surface layer. Further, the through holes 17, 32, 43, 44, 52 may be formed in a polygonal shape or the like instead of the circular cross section. In this case, the inner diameters L1, L3, L5, and L7 of the through holes 17, 32, 43, 44, and 52 described above may be replaced with the minimum dimension that passes through the center of the polygonal through hole.

  In each of the above-described embodiments, the case where the seat pads 1, 30, 40, 50 are mounted on the vehicle has been described. However, the present invention is not necessarily limited thereto. The seat pads 1, 30, 40, and 50 may be mounted on a vehicle such as a ship, an aircraft, or a railway vehicle. In addition, the seat pads 1, 30, 40, and 50 are not limited to being used for a seating portion where a seated person H sits in the seat, and the present invention may be applied to a seat pad used for a seat back portion. . In this case, the front-rear direction of the seat pad is the thickness direction of the seat pad.

  In each of the above-described embodiments, the back layers 12, 16, 31, 41, 42, 51 are made of a non-breathable foam such as foamed polystyrene that is harder and has a lower specific gravity than the surface layers 11, 15 made of flexible foam. Although the case has been described, the present invention is not necessarily limited to this. As long as the cushioning material has air permeability, the surface layers 11 and 15 may be made of other than the flexible foam. Examples of cushioning materials having air permeability other than flexible foam include, for example, chip urethane and synthetic resin fibers cured (bonded) with a binder such as urethane, and synthetic resin fibers melted with heat to each other. What was welded etc. are mentioned. Further, these cushion materials may be used in combination.

  Further, examples of non-breathable foams that are harder than the surface layers 11 and 15 and have a lower specific gravity include beaded foams such as beaded foamed polypropylene and beaded foamed polyethylene in addition to expanded polystyrene (beaded foamed polystyrene). It is done. Further, the back surface layer is not limited to one that is harder than the surface layers 11 and 15 and has a small specific gravity. Further, the back layer is not limited to a non-breathable foam, and may be a foam having lower breathability than the surface layers 11 and 15. Even in such a case, by providing the through holes 17, 32, 43, 44, 45, and 52 in the back layer having lower air permeability than the surface layers 11 and 15, the stroke amount during vibration of the surface layers 11 and 15 can be reduced. You can do more.

  In each of the embodiments described above, the case where the cloth members 18 and 49 are woven or knitted fabric such as a coarse blanket has been described, but the present invention is not necessarily limited thereto. If the air permeability is higher than that of the back surface layers 12, 16, 31, 41, 42, 51, the fabric members 18, 49 may be made of non-woven fabric, felt, cold water, a laminated composite thereof, or the like.

  In each of the above embodiments, the through-holes 17, 32, 43, mainly in the positions corresponding to the sciatic nodules T 1, T 2 of the seated person H in the back surface layers 12, 31, 41, 51 of the bottom part 10. Although the case where 52 is provided was demonstrated, it is not necessarily restricted to this. The positions, sizes, and numbers of the through holes 17, 32, 43, and 52 can be changed as appropriate. The through holes 17, 32, 43, and 52 are provided at positions away from positions corresponding to the positions immediately below the sciatic tubers T1 and T2. It may be provided. Further, the position, size, and number of the through holes 44 provided in the back surface layer 42 of the lower thigh 14 can be appropriately changed. However, it is necessary to adjust the position, size, and number of the through holes 44 or adjust the hardness of the material of the back surface layer 42 so that the submarine phenomenon does not easily occur.

  In addition, the through hole 45 is not limited to the case where the back surface layers 41 and 51 are opened on the outer surface in the left-right direction, and the through hole may be opened on the front surface in the front and rear direction of the back surface layers 41 and 51. Further, as long as a part of the through hole penetrates the back surface layers 41, 51, a part of the through hole may not penetrate the back surface layers 41, 51 on the outer surface in the left-right direction or the outer surface in the front-rear direction. That is, the through hole 45 connected to the through hole 43 may be a groove provided on the surface layer 11 side. However, if the through holes 17, 32, 44 are not opened to the front, back, left, and right of the back surface layers 12, 16, 31, 42, the local air flow in the front, back, left, and right of the seat pads 1, 30, 40, 50 Accordingly, it is possible to prevent the seated person H from feeling uncomfortable.

  In each of the above embodiments, the surface layers 11 and 15 are foam-molded with the back surface layers 12, 16, 31, 41, 42 and 51 and the cloth members 18 and 49 placed in the molds 20 and 46, and the back surface layers are formed. Although the case where 12, 16, 31, 41, 42, 51 and the surface layers 11 and 15 were integrated was demonstrated, it is not necessarily restricted to this. The foam-molded surface layers 11 and 15, the cloth members 18 and 49, and the back surface layers 12, 16, 31, 41, 42, and 51 may be integrated using an adhesive, a wire, a hook, or the like. Moreover, a convex part is provided in back layer 12, 16, 31, 41, 42, 51, the hole provided in the cloth members 18 and 49 is inserted in a convex part, and back layer 12, 16, 31, 41, 42, The fabric members 18, 49 may be attached to 51. Further, tag pins or Velcro (registered trademark) may be used for fixing the back surface layers 12, 16, 31, 41, 42, 51 to the cloth members 18, 49.

1, 30, 40, 50 Seat pad 4 Front surface 5 Back surface 10 Bottom bottom 11, 15 Surface layer 12, 16, 31, 41, 42, 51 Back surface layer 14 Lower thigh 17, 32, 43, 44, 45, 52 Through hole 18, 49 cloth members

Claims (5)

A seat pad mounted on a vehicle having a seated person side surface and a back surface opposite to the surface in the thickness direction,
A surface layer formed of a cushioning material having air permeability by forming the surface;
A back layer made of a foam that forms at least a part of the back surface and is integrated with the surface layer, and is less breathable than the surface layer;
A cloth member that is disposed at least in part between the front surface layer and the back surface layer and has a higher air permeability than the back surface layer,
A through hole comprising a cavity penetrating the back surface layer in the thickness direction is provided;
The cloth pad closes the through hole. The cloth member is disposed in a part between the front surface layer and the back surface layer,
The surface layer is at least partially composed of a flexible foam;
The surface layer is integrated with the back surface layer by a part of the flexible foam entering the irregularities on the outer surface of the back surface layer at a position where the cloth member is not present between the surface layer and the back surface layer. The seat pad according to claim 1. The surface is a seating surface on which a seated person sits;
A lower bottom portion having the front surface layer and the back surface layer and constituting the rear side of the seating surface;
A lower thigh having the front surface layer and the back surface layer and constituting the front side of the seating surface from the bottom of the bottom,
The seat pad according to claim 1, wherein the through hole is provided in the back surface layer of the bottom part of the bottom.   The seat pad according to claim 3, wherein the through hole is not provided in the lower thigh.   5. The seat pad according to claim 3, wherein at least a part of the through hole is provided in a symmetric position at a distance of 50 mm to 80 mm in the left and right direction from the center in the left and right direction.

Images