TW201825353A - Vehicle seat - Google Patents

Abstract

The present invention provides a vehicle seat 1 used inside an aircraft. The vehicle seat 1 comprises a back surface portion 20 on which the shoulder and back of a user are placed, and a seat surface portion 30 on which the buttocks of a user are placed. Both the back surface portion 20 and the seat surface portion 30 are made of urethane. The thickness of the back surface portion 20 is larger than the thickness of the seat surface portion 30.

Description

 Vehicle seat cushion  

The same aspect of the invention relates to a vehicle seat cushion for use inside a vehicle.

Various vehicle seat cushions are known. A seat cushion for an aircraft seat is described in Japanese Laid-Open Patent Publication No. 2009-153564. The seat cushion has a lower cushion layer and an upper cushion layer on the upper surface of the lower cushion layer. The lower mat layer is composed of a polyurethane foam containing melamine. The thickness of the lower cushion layer is set to be about 50 mm to 70 mm. The upper cushion layer is formed by heating and compressing the upper and lower surfaces of the urethane foam containing melamine, and is then applied to the upper surface of the lower cushion layer by an adhesive such as a polyurethane. The upper cushion layer after heating and compression plastic deformation has a thickness of 5 to 15 mm.

 [Previous Technical Literature]    [Patent Literature]  

Patent Document 1: Japanese Laid-Open Patent Publication No. 2009-153564

Moreover, as for the seat cushion for a vehicle, it is known that the back surface part which the back surface of a user contact|connects, and the seat surface which the fall of the user's buttocks. However, in vehicles such as automobiles, electric trains, ships, and airplanes, most of the users use the seat cushion for the vehicle for a long time, and sometimes the user sleeps on the seat cushion of the vehicle. When the user sleeps on the seat cushion of the vehicle, the actual situation is that when the user turns over, the shoulder of the user is pressed. Therefore, since the shoulder is pressed when the user turns over, there is a problem that the state of the sleep comfort cannot be maintained in the vehicle.

It is an object of the present invention to provide a seat cushion for a vehicle that can maintain a good sleep comfort in a vehicle.

A seat cushion for a vehicle according to an aspect of the present invention is a seat cushion for a vehicle used in a vehicle, and includes: a back portion for the shoulder and the back of the user; and a seat for the user's buttocks The face, the back part, and the seat part are all polyurethane products, and the thickness of the back part is thicker than the thickness of the seat part.

The vehicle seat cushion includes a back portion for the shoulder and the back of the user to lean against, and a seat portion for the user's buttocks to be seated, and the back portion and the seat portion are all polyurethane products. Therefore, since the back surface portion and the seat surface portion are both light and highly cushioning, the feeling of fit to the shoulder, the back, and the buttocks of the user can be improved. Therefore, the user can have a comfortable sleep in the vehicle. Moreover, the thickness of the back face for the shoulder and back of the user is thicker than the thickness of the seat face. Therefore, when the user turns over, the shoulder of the user can be penetrated into the back portion, thereby improving the condition in which the shoulder sinks into the back portion. Therefore, the turning characteristics can be improved while continuously providing the user with a comfortable sleep in the vehicle.

Further, irregularities may be formed on the back side surface of the back surface portion. In this case, the shoulder and the back of the user are in contact with the unevenness of the back surface portion, so that the dispersibility of the body pressure generated when the shoulder portion and the back portion are leaned can be improved. In other words, the body pressure can be easily dispersed by the unevenness on the back surface portion, so that the feeling of pressure on the shoulder and the back of the user can be reduced. Therefore, the user in the vehicle can be provided with good sleep comfort.

Further, the back surface portion includes: a first member on the back side; and a second member that is located on the opposite side of the back from the first member and that is harder than the first member, and the first member and the second member are bonded to each other. The bonding surface of the first member and the second member and the bonding surface of the second member to the first member may be formed into a wave shape. In this case, the back surface portion is configured by bonding the first member to the second member that is harder than the first member. Therefore, by using the soft first member facing the front side, the shoulder and the back of the user can be brought into contact with the soft portion. Therefore, the user can provide better sleep comfort. Further, the bonding surface of the first member and the second member and the bonding surface of the second member and the first member are formed in a wave shape. As described above, the bonding surface is formed into a wave shape, and the body pressure can be easily dispersed among the bonding surfaces. That is, the body pressure of the user can be easily dispersed on the bonding surface. Therefore, by improving the body pressure dispersibility, the feeling of pressure on the shoulders and the back of the user can be further reduced. As a result, the user in the vehicle can be continuously provided with good sleep comfort.

Further, the mountain portion and the valley portion which are formed in a wave shape may be arranged in the direction in which the back surface portion and the seat surface portion are arranged in parallel. In this case, the undulating hills and valleys are juxtaposed in the direction in which the user's body extends. Therefore, it is easier to disperse the body pressure than when the mountain and the valley are juxtaposed in other directions. Therefore, by further improving the body pressure dispersibility, it is possible to provide a user with better sleep comfort.

According to one aspect of the present invention, a state of good sleep comfort in a vehicle can be maintained.

1‧‧‧Vehicle seat cushions

2‧‧‧Backrest

2a, 3a, 4a‧‧‧ upper surface

2b, 3b, 4b‧‧‧ first side

2c, 4c‧‧‧ end face

2d, 3c, 4d‧‧‧ second side

3‧‧‧s

4‧‧‧foot

5, 6‧‧‧ junction section

20, 50, 70, 80‧‧‧ back

21, 31, 51‧ ‧ the first component

21A, 22A, 51A, 52A‧‧‧ compliant surface

22, 32, 52‧‧‧ second component

23‧‧‧1st slit

23a, 24a‧‧‧ Wave Department

23b, 24b‧‧‧ Expanding Department

24‧‧‧2nd slit

25, 35, 45, 65‧‧‧ lower components

30, 60‧‧‧ face

31A, 32A‧‧‧Fitting surface

40‧‧‧foot members

61‧‧‧ Face

71, 81‧‧ ‧ convex

71a‧‧‧1st hard layer

71b, 81a‧‧‧ soft layer

71c‧‧‧2nd hard layer

81b‧‧‧hard layer

81c‧‧‧ top

A1‧‧‧ length direction

A2‧‧‧width direction

A3‧‧‧ height direction

M‧‧‧ users

M1‧‧‧ shoulder

M2‧‧‧ Back

M3‧‧‧ hips

M4‧‧‧foot

P1, P2, P3, P4‧‧‧ wave shape

P11, P21‧‧‧ Mountain

P12, P22‧‧‧ Valley

W‧‧‧Wall

Fig. 1 is a perspective view of a seat cushion for a vehicle according to a first embodiment.

Fig. 2 is a schematic plan view of the vehicle seat cushion of Fig. 1.

Fig. 3 is a sectional view taken along line III-III of Fig. 2;

Fig. 4(a) is a side view of the back portion, and Fig. 4(b) is a side view of the seat portion.

Fig. 5 is a plan view of the back portion.

Fig. 6 is a perspective view showing a back surface portion of a vehicle seat cushion according to a second embodiment.

Fig. 7 is a side view of the back portion of Fig. 6.

Fig. 8 is a perspective view showing a seat portion of a seat cushion for a vehicle according to a second embodiment.

Fig. 9 is a side view of the seat portion of Fig. 8.

Fig. 10 (a) is a side view of the back surface portion of the first modification. (b) is a side view of the back surface portion of the second modification.

Hereinafter, a seat cushion for a vehicle according to an embodiment will be described with reference to the drawings. In the description of the drawings, the same reference numerals are attached to the same or equivalent elements, and the repeated description is omitted.

(First embodiment)

The seat cushion 1 for a vehicle of the present embodiment is a seat cushion used in a vehicle such as an automobile, a train, a ship, or an airplane. An example of the use of the vehicle seat cushion 1 inside the aircraft will be described below. The vehicle seat cushion 1 is, for example, a flame-retardant fireproof seat cushion, and is a full flat seat housed in a flame-retardant seat cover. Also, the cabin class of the aircraft in which the vehicle seat cushion 1 is installed is, for example, a business class or a first class cabin. As shown in FIGS. 1 and 2, the seat cushion 1 for a vehicle includes a backrest portion 2 for the shoulder M1 and the back portion M2 of the user M to rest, and a seat portion 3 for the buttocks M3 of the user M to be seated; And a footrest 4 for the user's foot M4.

The seat pad 1 for a vehicle is a trapezoidal shape extending in the longitudinal direction A1 in a plane angle. The seat pad 1 for a vehicle has a fixed width in the width direction A2 and a fixed height in the height direction A3. The backrest portion 2, the seat portion 3, and the step portion 4 are juxtaposed along the longitudinal direction A1 and are coupled to each other.

The backrest portion 2, the seat portion 3, and the step portion 4 are formed in a trapezoidal shape at a plane angle. Further, the two vehicle seat cushions 1 are adjacent to each other via the wall portion W which is inclined with respect to the longitudinal direction A1, and the two vehicle seat cushions 1 are disposed opposite to each other in the direction toward the longitudinal direction A1. The two vehicle seat cushions 1 have a rectangular shape in a plane angle.

The boundary portion 5 of the backrest portion 2 and the seat portion 3 extends in the width direction A2, which corresponds to the upper bottom of the trapezoidal backrest portion 2, and corresponds to the lower bottom of the trapezoidal shaped seat portion 3. The boundary portion 6 between the seat portion 3 and the step portion 4 extends in the width direction A2, and the boundary portion 6 corresponds to the upper bottom of the trapezoidal seat portion 3 and corresponds to the lower bottom of the stepped footrest portion 4.

The thickness of the backrest portion 2, the seat portion 3, and the step portion 4 (the length in the height direction A3) are, for example, the same, and the lengths of the backrest portion 2, the seat portion 3, and the step portion 4 (the length in the longitudinal direction A1) are also the same. The width of the backrest portion 2 (the length in the width direction A2) is wider than the width of the seat portion 3 and the width of the step portion 4, and the width of the seat portion 3 is wider than the width of the step portion 4. Therefore, the volume of the backrest portion 2 is larger than the volume of the seat portion 3 and the volume of the footrest portion 4, and the volume of the seat portion 3 is larger than the volume of the footrest portion 4.

The backrest portion 2 has a trapezoidal upper surface 2a, a rectangular first side surface 2b that is inclined with respect to the longitudinal direction A1, and a rectangular end surface 2c that forms one end of the vehicle seat cushion 1 in the longitudinal direction A1. A rectangular second side surface 2d extending in the longitudinal direction A1 and the height direction A3 on the opposite side of the side surface 2b.

The upper surface 2a, the first side surface 2b, the end surface 2c, and the second side surface 2d are all flat, and the upper surface 2a is placed above the shoulder M1 and the back M2 of the user M. The first side surface 2b faces the footrest portion 4 of the vehicle seat cushion 1 adjacent to the width direction A2 via the wall portion W. The end surface 2c extends in the width direction A2 and the height direction A3, and the end surface 2c and the second side surface 2d are orthogonal to each other, for example.

The seat portion 3 has a trapezoidal upper surface 3a, a rectangular first side surface 3b that is inclined with respect to the longitudinal direction A1, and a rectangular shape that extends in the longitudinal direction A1 and the height direction A3 on the opposite side of the first side surface 3b. 2 side 3c. The upper surface 3a, the first side surface 3b, and the second side surface 3c are all flat, and the weir is placed above the upper surface 3a for the buttocks M3 of the user M. The first side face 3b and the second side face 3c are located on the same plane as the first side face 2b and the second side face 2d of the backrest portion 2, respectively. The first side surface 3b faces the seat portion 3 of the vehicle seat cushion 1 adjacent to the width direction A2 via the wall portion W.

The step portion 4 has a trapezoidal upper surface 4a, a first side surface 4b on the same plane as the first side surface 3b of the seat portion 3, and another end in the longitudinal direction A1 of the vehicle seat cushion 1 (the backrest portion 2). A rectangular end surface 4c of the end portion on the opposite side of the end surface 2c) and a second side surface 4d on the same plane as the second side surface 3c of the seat portion 3.

The upper surface 4a, the first side surface 4b, the end surface 4c, and the second side surface 4d are all flat, and the weir is placed on the upper surface 4a for the foot M4 of the user M. The first side surface 4b faces the backrest portion 2 of the vehicle seat cushion 1 adjacent to the width direction A2 via the wall portion W. The end surface 4c extends in the width direction A2 and the height direction A3, and the end surface 4c and the second side surface 4d are orthogonal to each other, for example.

The upper surface 2a of the backrest portion 2, the upper surface 3a of the seat portion 3, and the upper surface 4a of the step portion 4 are formed substantially in a completely flat shape (full lying type), and the inclination of the upper surface 2a, the upper surface 3a, and the upper surface 4a The angles can be changed from each other. By changing the inclination angles of the upper surface 2a, the upper surface 3a, and the upper surface 4a as described above, it is possible to provide a more comfortable sleep of the user M of the vehicle seat cushion 1.

Fig. 3 is a sectional view taken along line III-III of the backrest portion 2, the seat portion 3, and the step portion 4 of Fig. 2; As shown in FIG. 3, the backrest portion 2 includes a back surface portion 20 located above the height direction A3 and a lower member 25 positioned below the back surface portion 20. Further, the seat portion 3 includes a seat portion 30 located above the height direction A3, and a lower member 35 including the pedal member 40 and the lower member 45.

The back surface portion 20 and the footrest member 40 have the same configuration, for example, and the lower member 25 and the lower member 45 are also identical to each other. Further, the thicknesses of the lower member 25 and the lower member 35 are different from each other. However, the configurations other than the thicknesses of the lower member 25 and the lower member 35 are, for example, identical to each other. Therefore, in the following description, in order to avoid redundancy, the description of the pedal member 40, the lower member 35, and the lower member 45 will be appropriately omitted.

The back portion 20 is a polyurethane product. The back surface portion 20 has a rectangular shape in the side angle, and the thickness of the back surface portion 20 is, for example, 60 mm. Further, the seat portion 30 is a polyurethane product similarly to the back surface portion 20, and has a rectangular shape in side angle. The thickness of the seat portion 30 is thinner than the thickness of the back portion 20. The ratio of the thickness of the seat portion 30 to the thickness of the back surface portion 20 is, for example, 2:3, and the specific example of the thickness of the seat portion 30 is 40 mm.

The lower member 25 is made of a material that is harder than the back surface portion 20 and the seat portion 30. The lower member 25 is thinner than the lower member 35, and the sum of the thickness of the lower member 25 and the thickness of the back surface portion 20 is the same as the sum of the thickness of the lower member 35 and the thickness of the seat portion 30, for example. Therefore, as described above, the back portion 20 is thicker than the seat portion 30, and therefore the back portion 2 is softer than the seat portion 3.

As shown in Fig. 4(a), the back surface portion 20 is made of a polyurethane first member 21 located on the upper side (the back M2 side), and a polyurethane made of the lower side of the first member 21 and harder than the first member 21. The second member 22 is configured. The materials of the first member 21 and the second member 22 are all polyurethane. The first member 21 is a polyurethane that is softer than the second member 22 . The physical properties of the first member 21 are different from those of the second member 22, and for example, the density of the first member 21 is smaller than the density of the second member 22.

The thickness of the first member 21 and the thickness of the second member 22 are, for example, the same as each other. The first member 21 and the second member 22 are bonded to each other in the height direction A3. The first member 21 includes a bonding surface 21A with the second member 22 , and the second member 22 includes a bonding surface 22A with the first member 21 . The bonding surface 21A and the bonding surface 22A have the same shape and are bonded to each other in close contact with each other.

The bonding surface 21A and the bonding surface 22A have a wave shape P1 in a state of being bonded to each other. The wave shape P1 extends in the longitudinal direction A1. The wave shape P1 is formed by a plurality of mountain portions P11 and a plurality of valley portions P12, and the mountain portions P11 and the valley portions P12 are alternately arranged along the longitudinal direction A1. Further, the wave shape P1 extends linearly throughout the width direction A2.

As shown in FIG. 4(b), the seat portion 30 and the first member 21 and the second member 22 of the back surface portion 20 are composed of the first member 31 and the second member 32 made of polyurethane. The first member 31 and the second member 32 have different thicknesses and shapes of the bonding faces than the first member 21 and the second member 22. The material of each of the first member 31 and the second member 32 is the same as the material of each of the first member 21 and the second member 22, for example.

The thickness of the first member 31 and the thickness of the second member 32 are, for example, the same as each other. The first member 31 includes a bonding surface 31A with the second member 32 , and the second member 32 includes a bonding surface 32A with the first member 31 . The bonding surface 31A and the bonding surface 32A have a wave shape P2 in a state of being bonded to each other, and the wave shape P2 extends in the longitudinal direction A1. The mountain portion P21 and the valley portion P22 of the wave shape P2 are alternately arranged along the longitudinal direction A1. Further, the wave shape P2 extends linearly throughout the width direction A2.

The period of the wave shape P2 is, for example, shorter than the period of the wave shape P1. In one example, the period of the wave shape P2 is 2/3 of the period of the wave shape P1. Thus, the ratio of the period of the wave shape P2 to the period of the wave shape P1 may also be 2:3. Further, the ratio of the period of the wave shape P2 to the period of the wave shape P1 may be the same as the ratio of the height of the seat portion 30 to the height of the back surface portion 20 (2:3). The amplitude of the wave shape P2 and the amplitude of the wave shape P1 are, for example, the same as each other, but may be different. Specifically, the ratio of the amplitude of the wave shape P2 to the amplitude of the wave shape P1 may be 2:3.

As shown in FIG. 5, the back surface portion 20 has a plurality of first slits 23 and a plurality of second slits 24 formed on the upper surface of the first member 21. Each of the first slits 23 extends in a direction forming an angle of 45° with respect to the longitudinal direction A1 and the width direction A2, and each of the second slits 24 extends in the direction orthogonal to the direction in which the first slits 23 extend.

The first slit 23 and the second slit 24 are alternately arranged in the longitudinal direction A1. Further, the first slit 23 and the second slit 24 are alternately arranged in the width direction A2. The first slit 23 and the second slit 24 are arranged in a lattice shape on the upper surface of the first member 21 . Specifically, the second slit 24 is disposed at the center of the square portion formed by the four first slits 23 adjacent to each other in the longitudinal direction A1 and the width direction A2, and is adjacent to each other in the longitudinal direction A1 and the width direction A2. The first slit 23 is disposed at the center of the square portion formed by the four second slits 24. The size of the first slit 23 and the size of the second slit 24 are, for example, the same as each other.

The first slit 23 has a corrugated portion 23a that extends while being curved in a curved shape, and an enlarged diameter portion 23b that expands at both ends in the longitudinal direction of the corrugated portion 23a. The waveform portion 23a includes, for example, two mountain portions and two valley portions. The shape of the enlarged diameter portion 23b is, for example, a circular shape. The second slit 24 has a corrugated portion 24a and an enlarged diameter portion 24b similar to the corrugated portion 23a and the enlarged diameter portion 23b of the first slit 23.

As described above, since the first slit 23 and the second slit 24 are provided, the back portion 20 is made softer, and the user M can provide good sleep comfort. Further, in the above, the first member 21 includes the first slit 23 and the second slit 24 . However, the second member 22 may include the first slit 23 and the second slit 24 . Further, at least one of the first member 31 and the second member 32 may include the first slit 23 and the second slit 24 . Moreover, the place where the first slit 23 and the second slit 24 are provided, and the arrangement of the first slit 23 and the second slit 24 can be appropriately changed.

Next, the effect obtained by the vehicle seat cushion 1 of the present embodiment will be described.

As shown in FIGS. 1 and 3, the vehicle seat cushion 1 includes a back surface portion 20 for the shoulder M1 and the back portion M2 of the user M to lean against, and a seat surface portion 30 for the buttocks M3 of the user M to seat. The back portion 20 and the seat portion 30 are all polyurethane products. Therefore, since the back surface portion 20 and the seat surface portion 30 are both light and highly cushioning, the feeling of fit to the shoulder M1, the back M2, and the buttocks M3 of the user M can be improved.

Further, the thickness of the back surface portion 20 against which the shoulder M1 and the back portion M2 of the user M rest is thicker than the thickness of the seat portion 30. Therefore, when the user M turns over, the shoulder M1 of the user M can be sunk into the back portion 20, so that the state in which the shoulder portion M1 sinks into the back portion 20 can be improved. Therefore, the turning characteristics can be improved, and the user M can be continuously provided with comfortable sleep in the aircraft.

Further, the back surface portion 20 includes a first member 21 located on the side of the back portion M2, and a second member 22 located on the opposite side of the back portion M2 from the first member 21 and harder than the first member 21, and the first member 21 and the first member 21 2 members 22 are attached to each other. Further, the bonding surface 21A of the first member 21 and the second member 22 and the bonding surface 22A of the second member 22 and the first member 21 are formed into a wave shape P1. Thus, the bonding surfaces 21A and 22A are formed into a wave shape P1, and the body pressure can be easily dispersed on the bonding surfaces 21A and 22A.

That is, the body pressure of the user M can be easily dispersed among the bonding faces 21A and 22A. Therefore, by improving the body pressure dispersibility, the feeling of pressure on the shoulder M1 and the back M2 of the user M can be further alleviated, so that the user M in the aircraft can be provided with good sleep comfort. The above effects are also obtained from the seat portion 30 and the step member 40.

Further, the mountain portion P11 and the valley portion P12 which form the wave shape P1 are arranged along the longitudinal direction A1 in which the back surface portion 20 and the seat surface portion 30 are arranged in parallel. Therefore, the mountain portion P11 and the valley portion P12 of the wave shape P1 are juxtaposed in the direction in which the body of the user M extends. Therefore, it is easier to disperse the body pressure than when the mountain and the valley are juxtaposed in other directions. In this way, by further improving the body pressure dispersibility, the sleep comfort of the user M can be made more comfortable. This effect is also obtained from the wave shape P2 of the seat portion 30.

Further, in the present embodiment, since the thickness of the back surface portion 20 is thicker than the thickness of the seat portion 30, there is an advantage that the hardness required for the seat cushion for an aircraft can be easily realized. In terms of the hardness of the seat cushion for an aircraft, the hardness of the seat portion including the seat portion may be higher than the hardness of the back portion including the back portion.

The seat cushion 1 for a vehicle according to the present embodiment is considered in consideration of the hardness required for the seat cushion for an aircraft. That is, in the seat cushion 1 for a vehicle, the hardness of the lower members 25, 35 is higher than the hardness of the back portion 20 and the seat portion 30, and the thickness of the seat portion 30 is thinner than the thickness of the back portion 20, so the hardness of the seat portion 3 It becomes higher than the hardness of the backrest portion 2. As described above, since the back surface portion 20 is thicker than the seat surface portion 30, the seat portion 3 can be made harder than the backrest portion 2, so that the hardness required for the seat cushion for an airplane can be easily realized.

Further, in the seat cushion 1 for a vehicle, the first member 21 of the back surface portion 20 is provided with slits 23 and 24. Therefore, the first member 21 can be made softer, so that the shoulder M1 of the user M can be further penetrated into the back portion 20, contributing to further improvement in sleep comfort. Further, as described above, since the first member 21 includes the first slit 23 and the second slit 24, the back portion 20 can be made softer, so that the sleep comfort of the user M is further improved.

In the back surface portion 20 of the vehicle seat cushion 1, the bonding surface 21A of the first member 21 and the bonding surface 22A of the second member 22 have the same shape, and are bonded to each other in close contact with each other. Therefore, there is no passage of air between the bonding surface 21A and the bonding surface 22A. As described above, since the passage of the air is not provided between the bonding surface 21A and the bonding surface 22A, it can be used as the seat cushion 1 for a vehicle having high incombustibility. This effect is also obtained from the seat portion 30 and the step member 40.

(Second embodiment)

Next, the seat cushion for a vehicle according to the second embodiment will be described with reference to Figs. 6 to 9 . Descriptions overlapping with the first embodiment will be appropriately omitted in the following description. The vehicle seat cushion according to the second embodiment includes a back surface portion 50 and a seat surface portion 60 having a shape different from that of the back surface portion 20 and the seat surface portion 30 of the first embodiment.

As shown in FIGS. 6 and 7, the back surface portion 50 has a substantially cubic shape, and the thickness of the back surface portion 50 is, for example, 80 mm. The back surface portion 50 is composed of a polyurethane first member 51 located on the upper side (back M2 side) and a polyurethane second member 52 located on the lower side of the first member 51. The hardness of the first member 51 and the hardness of the second member 52 are, for example, the same as each other. Further, the material of the first member 51 may be the same as or different from the material of the second member 52.

The thickness of the first member 51 and the thickness of the second member 52 are, for example, the same as each other, and are both 40 mm. The bonding surface 51A of the first member 51 and the second member 52 and the bonding surface 52A of the second member 52 and the first member 51 are both flat surfaces. The bonding surface 51A and the bonding surface 52A are bonded together in a state of being in close contact with each other.

The surface 51B on the upper side of the first member 51 has a wave shape P3. The wave shape P3 extends in the longitudinal direction A1 and the width direction A2, respectively. The wave shape P3 is set, for example, in a sinusoidal shape extending in two dimensions. The wave shape P3 is formed, for example, over the entire surface 51B. The first member 51 is formed by applying a cross-sectional process to the polyurethane material. Specifically, it is formed by cutting a cubic-shaped polyurethane material using a cross-section cutter. Further, the second member 52 has a cubic shape.

As shown in Figs. 8 and 9, the seat portion 60 and the back portion 50 are similarly made of a polyurethane product and have a substantially cubic shape. A lower member 65 that is harder than the seat portion 60 is adhered to the lower surface of the seat portion 60. The bonding surface of the seat portion 60 and the lower member 65 is flat. The ratio of the thickness of the seat portion 60 to the thickness of the back surface portion 50 is, for example, 1:1, and the thickness of the seat portion 60 is 40 mm. Further, the lower member 65 may be provided with one layer as shown in Figs. 8 and 9, or may be provided with a plurality of layers.

The surface 61 on the upper side of the seat surface 60 has a wave shape P4, and the wave shape P4 extends in the longitudinal direction A1 and the width direction A2, respectively. The wave shape P4 is set, for example, as a sine wave extending in two dimensions, and is formed on the entire surface 61. The seat portion 60 is formed by applying a cross-sectional process to the polyurethane material. Further, the shape and material of the seat portion 60 may be the same as or different from the back portion 50.

As described above, in the vehicle seat cushion according to the second embodiment, the thickness of the back surface portion 50 against which the shoulder M1 and the back portion M2 of the user M rest is thicker than the thickness of the seat portion 60. Therefore, when the user M turns over, the shoulder M1 of the user M can be made to penetrate into the back portion 50, so that the state in which the shoulder portion M1 sinks into the back portion 50 can be improved. Therefore, the same effects as those of the first embodiment can be obtained.

Further, irregularities (wave shape P3) are formed on the surface 51B on the side of the back portion M2 of the back surface portion 50. Therefore, the shoulder M1 and the back M2 of the user M are in contact with the unevenness of the back surface portion 50, so that the body pressure dispersibility generated when the shoulder portion M1 and the back portion M2 are leaned can be improved. In other words, since the body pressure can be easily dispersed by the unevenness of the back surface portion 50, the feeling of pressure on the shoulder portion M1 and the back portion M2 of the user M can be reduced. Therefore, it is possible to provide a good sleep comfort for the user M in the vehicle.

The embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and modifications may be made without departing from the scope of the invention as described in the claims. That is, the present invention can be variously modified without departing from the scope of the gist of the invention.

For example, the first embodiment described above is a description of a seat pad 1 for a vehicle that is formed in a trapezoidal shape in a plan view. However, the shape of the seat cushion of the vehicle may not be a trapezoidal shape, and may be appropriately changed. The planar shape of the vehicle seat cushion according to one aspect of the present invention may be, for example, a rectangular shape.

Moreover, the first embodiment is described with respect to the vehicle seat cushion 1 including the step portion 4. However, the step portion 4 can also be omitted. In the first embodiment, the vehicle seat pad 1 in which the back surface portion 20 and the seat surface portion 30 are provided above each of the lower members 25 and 35 will be described. However, the shape, size, number, and material of the lower member can be appropriately changed. In the first embodiment, an example in which the back surface portion 20 and the step member 40 have the same structure will be described. However, it may also be a member in which the seat portion and the pedal member are identical to each other.

In the first embodiment, the seat cushion 1 for a vehicle having a thickness of 60 mm on the back surface portion 20 and a thickness of 40 mm on the seat surface portion 30 will be described. However, the thickness of the back surface portion and the thickness of the seat surface portion are not limited to the above values, and can be appropriately changed. In the first embodiment, the back surface portion 20 and the seat surface portion 30 having the wave shapes P1 and P2 in which the period of the wave shape P2 is 2/3 of the period of the wave shape P1 will be described. However, in the seat cushion for a vehicle according to one aspect of the present invention, the period and amplitude of the wave shape can be appropriately changed.

In the second embodiment, the bonding surface 51A of the first member 51 and the second member 52 and the bonding surface 52A of the second member 52 and the first member 51 are both flat surfaces. However, the bonding surface 51A and the bonding surface 52A may have a wave shape as in the wave shape P1 of the first embodiment. That is, the shapes of the bonding surface 51A and the bonding surface 52A can be changed as appropriate.

Further, the second embodiment will be described with respect to a sinusoidal wave shape P3 extending in two dimensions. However, the shape and size of the upper surface 51B of the first member 51 and the upper surface 61 of the seat surface 60 can be appropriately changed.

For example, as shown in Fig. 10(a), the convex portion 71 may be provided with the first hard layer 71a from the upper side in the back surface portion 70 in which the convex portion 71 having the sinusoidal shape on the upper side is continuously provided in two dimensions. The soft layer 71b and the second hard layer 71c. In this case, the back surface portion 70 has a three-layer structure having the first hard layer 71a, the soft layer 71b, and the second hard layer 71c. Therefore, when the shoulder M1 and the back M2 of the user M lean against each other, the soft layer 71b interposed between the first hard layer 71a and the second hard layer 71c can be continuously given to the user M even if it is used for a long period of time. Good fit.

Further, the hardness of the first hard layer 71a and the hardness of the second hard layer 71c may be the same or different from each other. Further, instead of the back surface portion 70 having the three-layer structure including the first hard layer 71a, the soft layer 71b, and the second hard layer 71c, the first soft layer, the hard layer, and the second soft layer may have a three-layer structure. The back part.

Further, as shown in Fig. 10(b), a substantially parabolic convex portion 81 having a top portion 81c may be continuously provided on the upper side of the back surface portion 80 in two dimensions. The convex portion 81 is provided with a soft layer 81a and a hard layer 81b in this order from the upper side. The hard layer 81b is a truncated quadrangular pyramid shape in which the outer surface is curved, and the soft layer 81a is a quadrangular pyramid shape in which each side is curved and has a top portion 81c. The back surface portion 80 can stably support the shoulder portion M1 and the back portion M2 of the user M by the hard layer 81b, and gives the user M a good feeling of fit by the soft layer 81a.

Further, in FIG. 10(b), the back surface portion 80 in which the soft layer 81a is located on the upper side and the hard layer 81b is located on the lower side will be described. However, it is also possible to provide a back surface portion in which the hard layer is located on the upper side and the soft layer is located on the lower side. The modification of the back surface portion has been described above, and the seat surface portion can be similarly deformed.

(Example)

Next, an example of the vehicle seat cushion 1 of the first embodiment and an experiment after confirming the sinking state and the body pressure when the vehicle seat cushion 1 is used will be described. Further, the present invention is not limited to the following embodiments. In the vehicle seat cushion of the embodiment, as shown in Fig. 3, the thickness of the back surface portion 20 is thicker than the thickness of the seat portion 30, the thickness of the back surface portion 20 is 60 mm, and the thickness of the seat portion 30 is 40 mm. On the other hand, the thickness of the back surface portion 20 of the vehicle seat cushion of the comparative example and the thickness of the seat surface portion 30 were both 60 mm. In this experiment, the subjects were placed on the vehicle seat cushion of the embodiment and the vehicle seat cushion of the comparative example, and the sinking state and the body pressure at that time were measured.

As a result of the experiment, among the seat cushions for vehicles of the comparative example, the maximum value of sinking was 49.0 mm, and the standard deviation of each sinking area was 18.3 mm. On the other hand, in the seat cushion for a vehicle of the embodiment, the maximum value of sinking is 48.0 mm, and the standard deviation of each sinking area is 17.7 mm. According to the result, the seat cushion for a vehicle of the embodiment has less variation per sinking area than the seat cushion for a vehicle of the comparative example. Therefore, the seat cushion for a vehicle of the known embodiment has a higher resting posture than the seat cushion for a vehicle of the comparative example.

Claims (4)

 A seat cushion for a vehicle, which is a seat cushion for a vehicle used in a vehicle, comprising: a back portion for the shoulder and the back of the user; and a seat portion for the user's buttocks to be seated, The back surface portion and the seat surface portion are both polyurethane products, and the thickness of the back surface portion is thicker than the thickness of the seat portion.    The vehicle seat cushion according to claim 1, wherein the back surface of the back surface portion is formed with irregularities.    The vehicle seat cushion according to claim 1 or 2, wherein the back surface portion includes: a first member located on the back side; and a side opposite to the back portion from the first member, and is more than the foregoing a second member having a first member, wherein the first member and the second member are bonded to each other, and a bonding surface of the first member to the second member and a bonding between the second member and the first member The joint surface is set to a wave shape.    The vehicle seat cushion according to claim 3, wherein the mountain portion and the valley portion which form the wave shape are arranged in a direction in which the back surface portion and the seat surface portion are arranged in parallel.