JP2019209933A - Vehicle seat - Google Patents

Abstract

To provide a vehicle seat which can change hardness of an occupant support plane of a seat cushion and/or a seat back to a preferable state, according to a tilt angle of a seat back to a seat cushion.SOLUTION: A vehicle seat comprises: a seat cushion 11; a seat back 12; and angle detection means 30 capable of detecting a tilt angle of the seat back 12 to the seat cushion 11. The seat cushion 11 and the seat back 12 comprise: a cushion cover 11C forming an occupant support plane; a plurality of bag bodies 20 arranged in a seat width direction of the occupant support plane and in a direction vertical to the seat width direction and arranged in a rear face side of the back cover 12C; and control means 40 for controlling hardnesses of respective bag bodies 20 to a prescribed distribution state according to the tilt angle, on the basis of the detection result of the angle detection means 30.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle seat.

  2. Description of the Related Art There is known a vehicle seat configured such that the shape of an occupant support surface of a seat back can be changed according to a change in an inclination angle of the seat back with respect to the seat cushion. In the automobile seat disclosed in the following Patent Document 1, an air bag is disposed inside the occupant support surface of the upper portion of the seat back, and the air pressure supplied to the air bag is reduced as the inclination angle of the seat back with respect to the seat cushion is smaller. The shape of the occupant support surface is recessed so as to be lowered.

JP2015-205562A

  In the technique disclosed in Patent Document 1, the shape of the occupant support surface of the upper portion of the seat back can be changed according to the inclination angle of the seat back with respect to the seat cushion. However, the hardness of the seat cushion and / or the occupant support surface of the seat back cannot be changed over the entire area of the occupant support surface of the seat back according to the inclination angle of the seat back with respect to the seat cushion. In an autonomous driving vehicle, the vehicle seat can change the posture of the vehicle seat from a normal posture in which the seat back is raised with respect to the seat cushion to a sleeping posture in which the seat back is flat with respect to the seat cushion. Is preferred. Therefore, there has been a demand for a vehicle seat that can make the hardness of the occupant support surface comfortable for the occupant in accordance with the inclination angle of the seat back with respect to the seat cushion.

  In view of such a demand, an object of the present invention is to provide a vehicle seat that can change the hardness of an occupant support surface of the seat cushion and / or the seat back to a suitable state according to the inclination angle of the seat back with respect to the seat cushion. Is to provide.

  1st invention of this invention is a vehicle seat, Comprising: The seat back connected so that the inclination angle was changeable with respect to this seat cushion, and the inclination angle of the said seat back with respect to the said seat cushion is detected A possible angle detection means, and the seat cushion and / or the seat back is disposed on the back side of the cover member, and the seat width direction of the occupant support surface. And a plurality of hardness changing means provided so as to be arranged in a direction perpendicular to the sheet width direction, and each hardness of the hardness changing means based on a detection result by the angle detecting means is determined in accordance with the inclination angle. And a control means for controlling to the distribution state.

  According to the first invention, based on the inclination angle of the seat back with respect to the seat cushion detected by the angle detection means, the control means causes the hardness of each hardness changing means to be in a predetermined distribution state corresponding to the inclination angle. Can be controlled. Accordingly, it is possible to provide a vehicle seat capable of controlling the hardness of the occupant support surface of the seat cushion and / or the seat back to a predetermined distribution state according to the inclination angle of the seat back with respect to the seat cushion.

  According to a second aspect of the present invention, in the first aspect, the predetermined distribution state is that the seat back direction of the occupant support surface is within a range of 90 degrees to 170 degrees of the seat back with respect to the seat cushion. The center portion of the occupant support surface is soft in the seat width direction when the angle of the seat back with respect to the seat cushion is in the range of 170 degrees to 180 degrees. The belt-like portions are arranged side by side in a direction perpendicular to the seat width direction, and the belt-like portions corresponding to the occupant's waist are harder than the other belt-like portions.

  According to the second invention, in the range from the normal posture to the comfort posture in which the angle of the seat back with respect to the seat cushion is 90 degrees to 170 degrees, the center portion in the seat width direction of the occupant support surface is softer than both sides. Therefore, the wobbling of the occupant body in the seat width direction during turning of the vehicle can be reduced. Further, in the sleeping posture range where the angle of the seat back with respect to the seat cushion is 170 degrees to 180 degrees, a plurality of belt-like portions having the same hardness in the seat width direction of the occupant support surface are arranged in a direction perpendicular to the seat width direction. The belt-shaped portion corresponding to the occupant's lower back is harder than the other belt-shaped portions. As a result, the lumbar part to which the load is most applied in the occupant's body is prevented from sinking too much, and the part other than the lumbar part can be made less likely to be crisp due to sideways or turning over.

  According to a third invention of the present invention, in the first invention or the second invention described above, the hardness changing means changes the hardness by taking air into and out of a flexible bag-like member in which a granular material is put. It is characterized by being a bag body.

  According to the third invention, when air is put into the flexible bag-shaped member in which the granular material is put, the gap between the granular materials becomes wider and soft, and the flexible bag-shaped member in which the granular material is put When the air is extracted from the inside, the gap between the granular materials becomes narrow and hard. Thereby, the hardness of the passenger | crew support surface of a seat cushion and / or a seat back is controllable.

According to a fourth aspect of the present invention, in the first aspect or the second aspect, the hardness changing means is
It is a resin structure that becomes soft when heated.

  According to the fourth invention, when the resin structure is heated, it becomes soft, and when the heating is stopped, it returns to the original hardness and becomes hard. Thereby, the hardness of the passenger | crew support surface of a seat cushion and / or a seat back is controllable.

1 is a perspective view of an automobile seat according to a first embodiment of the present invention. It is a block diagram which shows schematic structure of the hardness change mechanism of the said embodiment. It is a schematic diagram which shows the hardness change means of the said embodiment. It is a figure which shows the distribution state of the hardness in a passenger | crew's normal posture. It is a figure which shows the distribution state of the hardness in a passenger | crew's sleeping posture. It is a figure which shows the distribution state of the hardness in a passenger | crew's comfort posture. It is a block diagram which shows schematic structure of the hardness change mechanism of the vehicle seat which is 2nd Embodiment of this invention. It is a schematic diagram which shows the hardness change means of the said embodiment. It is a perspective view of the sheet for vehicles which is an embodiment which is not included in the present invention. It is a schematic diagram which shows the hardness change means of the said embodiment. It is a schematic diagram which shows the hardness change means of the said embodiment. It is a schematic diagram which shows the hardness change means of the said embodiment.

  1-6 shows the example which applied this invention to the vehicle seat 10 of 1st Embodiment of this invention. In each figure, each direction of the automobile and the automobile seat 10 when the automobile seat 10 is attached to the floor F of the automobile is shown by arrows. In the following description, the description regarding the direction is made based on this direction.

  As shown in FIG. 1, an automobile seat 10 includes a seat cushion 11 serving as a seating portion, a seat back 12 serving as a backrest, an ottoman 13 serving as a footrest, and a headrest 14 serving as a headrest. Yes. The seat back 12 has a lower end attached to the rear end of the seat cushion 11 so that the tilt angle can be changed. Here, the automobile seat 10 corresponds to the “vehicle seat” in the claims.

  The seat cushion 11 includes a metal cushion frame 11F constituting a skeleton, a cushion pad 11P in which twelve bags 20 as cushion materials supported on the cushion frame 11F are arranged, and a cushion pad 11P. And a cushion cover 11C as a covering material to be covered. The cushion frame 11F includes an arbitrary shape using a frame material, a wire material, a plate material, or the like. Here, the bag body 20 corresponds to “hardness changing means” in the claims, and the cushion cover 11C corresponds to “cover member” in the claims.

  The seat back 12 includes a metal back frame 12F constituting a skeleton, a back pad 12P in which 16 bags 20 as cushioning materials supported on the back frame 12F are arranged, and a back pad 12P. And a back cover 12C as a covering material. The back frame 12F includes an arbitrary shape using a frame material, a wire material, a plate material, or the like. The lower frame side of the back frame 12F is connected so that the inclination angle of the back frame 12F with respect to the rear end of the cushion frame 11F can be adjusted in the range of 90 degrees to 180 degrees at an angle formed by the surface of the occupant support surface. Yes. And the angle detection means 30 which detects the inclination angle of the back frame 12F with respect to the cushion frame 11F is arrange | positioned in the vicinity of the connection part. The angle detection means 30 functions to detect the inclination angle of the back frame 12F with respect to the cushion frame 11F and output a signal corresponding to the angle to the control means 40 described later. In FIG. 1, the seat back 12 is in a normal posture with an inclination angle with respect to the seat cushion 11 of approximately 90 degrees. Here, the back cover 12 </ b> C corresponds to a “cover member” in the claims.

  The ottoman 13 is covered with a ottoman pad 13P on which a metal ottoman frame 13F constituting a skeleton, eight bags 20 as cushioning materials supported on the ottoman frame 13F are arranged, and an ottoman pad 13P. And an ottoman cover 13C as a skin material. The ottoman frame 13F includes an arbitrary shape using a frame material, a wire material, a plate material, or the like. The upper end portion side of the ottoman frame 13F is connected to the front end portion side of the cushion frame 11F so that the inclination angle of the ottoman frame 13F can be adjusted in the range of 90 to 180 degrees at an angle formed by the surface opposite to the passenger support surface. Has been. In FIG. 1, the ottoman 13 is in a normal posture with an inclination angle with respect to the seat cushion 11 of approximately 90 degrees.

  As shown in FIG. 3, the bag body 20 is formed by enclosing a large number of small spherical foamed resin granules 22 in a bag-shaped member 21 made of a flexible material having a substantially cubic shape. ing. As will be described later, the bag-like member 21 of each bag 20 is connected to a pump 50 and an air supply / exhaust pipe 23 via an electromagnetic valve 60. When air is supplied into the bag-like member 21, it is in an expanded state 20A, and when air is discharged, it is in a contracted state 20C. An intermediate state between the expanded state 20A and the contracted state 20C is an intermediate state 20B. In the expanded state 20 </ b> A, the interval between the granular bodies 22 is widened so that it is difficult to contact and the hardness when pressed becomes soft. Further, in the contracted state 20C, the interval between the granular bodies 22 is narrowed so that they can easily come into contact with each other and the hardness when pressed is increased. In the intermediate state 20B, the hardness is intermediate between the expanded state 20A and the contracted state 20C.

  As shown in FIGS. 1 and 4, in the seat cushion 11, four bag bodies 20 are arranged in the left-right direction and three in the front-rear direction. There are two bags C21, C22, and C23 from the front to the rear at the center in the seat width direction that mainly supports the lower part of the buttocks and thighs of the seated occupant on the occupant support surface. They are arranged side by side. Further, on both sides in the seat width direction that mainly support the occupant side and thigh sides of the seated occupant on the occupant support surface, the bag C11, the bag C12, and the bag C13 from the front to the rear, respectively. Is disposed. A line extending in the front-rear direction between the bag body C21, the bag body C22, and the bag body C23 that are lined up on the left and right is the center line of the seat cushion 11 in the seat width direction.

  As shown in FIG.1 and FIG.4, in the seat back 12, the bag body 20 is arrange | positioned so that four may be arranged in the left-right direction and four in the up-down direction. On the occupant support surface, the bag body B21, the bag body B22, the bag body B23, and the bag body B24 are laterally moved from the lower side to the upper side at the center portion in the seat width direction that mainly supports the rear and back portions of the seated occupant. Two are arranged side by side. Further, on both sides of the seat width direction that mainly support the waist side and back side of the seated occupant on the occupant support surface, the bag body B11, the bag body B12, the bag body B13, A body B14 is provided. A line extending in the up-down direction between the bag body B21, the bag body B22, the bag body B23, and the bag body B24, which are arranged two by two on the left and right, is the center line in the seat width direction of the seat back 12.

  As shown in FIGS. 1 and 4, in the ottoman 13, four bag bodies 20 are arranged in the left-right direction and two in the vertical direction. On the extension line of the bag body C21, the bag body C22, and the bag body C23 of the seat cushion 11 and on the extension line of the bag body C11, the bag body C12, and the bag body C13, the bag body D11 and the bag body D12 It is arranged.

  In FIG. 2, the block diagram which shows schematic structure of the hardness change mechanism 100 which controls the hardness of each bag 20 is shown. Each bag 20 disposed in the seat cushion 11, the seat back 12, and the ottoman 13 is connected to the electromagnetic valve 60 by the air supply / exhaust pipe 23. Each electromagnetic valve 60 is connected to the pump 50 by an air supply pipe 61 and is connected to the control means 40 by an electric wiring 62. The angle detection means 30 and the pump 50 are connected to the control means 40 by electrical wiring 63 and electrical wiring 64, respectively. The control means 40 controls the operation of the pump 50 and the electromagnetic valve 60 according to the signal from the angle detection means 30. The pump 50 supplies air to each electromagnetic valve 60 by its operation. The electromagnetic valve 60 supplies the air supplied from the pump 50 to the bag body 20 or discharges the air from the bag body 20 according to the operation. Specifically, the electromagnetic valve 60 causes the air supply pipe 61 and the air supply / exhaust pipe 23 to communicate with each other when the solenoid valve 60 is open, and stops communication between the air supply pipe 61 and the air supply / exhaust pipe 23 when the solenoid valve 60 is closed. Further, in the exhaust state, the air supply pipe 61 is opened to the atmosphere while the air supply pipe 61 is closed, and air is discharged from the bag body 20. In response to a signal from the angle detection means 30, the control means 40 opens the electromagnetic valve 60 to each bag body 20 corresponding to a portion where the occupant support surface is desired to be soft, operates the pump 50 to supply air, and inflates 20A. After that, the solenoid valve 60 is closed. Further, the control means 40 exhausts the electromagnetic valve 60 corresponding to each bag body 20 corresponding to the portion where the occupant support surface is to be hardened in accordance with a signal from the angle detection means 30 to discharge air and to a contracted state 20C. After that, the electromagnetic valve 60 is closed. Further, the control means 40 operates the pump 50 by opening the electromagnetic valve 60 in each bag body 20 corresponding to the portion where the occupant support surface is desired to be intermediately hard according to the signal from the angle detection means 30. After supplying air to the intermediate state 20B, the electromagnetic valve 60 is closed, or after the electromagnetic valve 60 is exhausted and air is discharged to the intermediate state 20B, the electromagnetic valve 60 is closed. As a result, the hardness of the occupant support surfaces of the seat cushion 11, the seat back 12, and the ottoman 13 can be controlled to a predetermined distribution state corresponding to the inclination angle of the seat back 12 with respect to the seat cushion 11. The predetermined distribution state is an ideal distribution state corresponding to the inclination angle of the seat back 12 with respect to the seat cushion 11.

  4 to 6, a state in which the amount of air in each bag 20 is adjusted so as to approach an ideal distribution state of the hardness of the occupant support surface according to the inclination angle of the seat back 12 with respect to the seat cushion 11. Indicates. FIG. 4 shows a distribution state of the hardness of each bag 20 in a normal posture where the inclination angle of the seat back 12 with respect to the seat cushion 11 is about 90 to 120 degrees. Both the seat cushion 11 and the seat back 12 are hard at both sides in the left-right direction (seat width direction) and soft at the center in the left-right direction. Specifically, on both sides in the left-right direction, the bag body C11, the bag body C12, and the bag body C13 of the seat cushion 11, and the bag body B11, the bag body B12, the bag body B13, and the bag body B14 of the seat back 12 are contracted. The state 20C is hardened. Further, in the center portion in the left-right direction, the two bag bodies C22 at the center portion in the front-rear direction of the seat cushion 11 are in an expanded state 20A and are soft, and the other two bag bodies C21 and two bag bodies C23. However, the intermediate state 20B is set to an intermediate hardness. Further, the upper bag body B23 and the bag body B24 of the seat back 12 are in an inflated state 20A and are soft, and the lower bag body B21 and the bag body B22 are in an intermediate state 20B and have an intermediate hardness. ing. In the ottoman 13, the bag body D11 and the bag body D12 are all in an expanded state 20A and are soft. As a result, the wobbling of the occupant body in the seat width direction at the time of turning of the vehicle can be reduced, and the waist of the seated occupant can be firmly supported.

  FIG. 5 shows a hardness distribution state of each bag 20 in a sleeping posture in which the inclination angle of the seat back 12 with respect to the seat cushion 11 is 170 degrees to 180 degrees. In both the seat cushion 11 and the seat back 12, a belt-like portion formed by arranging bag bodies 20 having the same hardness in the left-right direction is arranged side by side in the front-rear direction, and a belt-like portion corresponding to the waist of the seated occupant It is harder than other strips. Specifically, in the seat cushion 11, the two bags C11 and the two bags C21 forming the front belt-shaped portion are set to the intermediate state 20B to be the intermediate hardness, and the two bags forming the central belt-shaped portion. The body C12 and the two bag bodies C22 are in the expanded state 20A and are soft, and the two bag bodies C13 and the two bag bodies C23 that form the rear belt-like portion are in the contracted state 20C and are hard. In the seat back 12, the two bag bodies B11 and the two bag bodies B21 that form the lower belt-shaped portion are hardened in the contracted state 20C, and form two rows of belt-shaped portions that are lined up and down in the center. The two bag bodies B12 and two bag bodies B22, the bag body B13, and the two bag bodies B23 are in an expanded state 20A and are soft, and two bag bodies B14 and two bag bodies B24 that form an upper belt-like portion. Is in the intermediate state 20B and has an intermediate hardness. In the ottoman 13, the bag body D11 and the bag body D12 are all in an expanded state 20A and are soft. As a result, the lumbar part to which the load is most applied in the occupant body is prevented from sinking too much, and the part other than the lumbar part is less likely to cause a crisp feeling due to being turned sideways or turned over.

  FIG. 6 shows a hardness distribution state of each bag 20 in an easy posture in which the inclination angle of the seat back 12 with respect to the seat cushion 11 is 120 degrees to 170 degrees. Both the seat cushion 11 and the seat back 12 are hard at both sides in the left-right direction (seat width direction) and soft at the center in the left-right direction. Specifically, on both sides in the left-right direction, the bag body C11, the bag body C12, and the bag body C13 of the seat cushion 11, and the bag body B11, the bag body B12, the bag body B13, and the bag body B14 of the seat back 12 are contracted. The state 20C is hardened. Moreover, in the center part of the left-right direction, the bag body C21, the bag body C22, the bag body C23 of the seat cushion 11, and the bag body B21, the bag body B22, the bag body B23, and the bag body B24 of the seat back 12 are in an inflated state. It is 20A and is soft. The difference from the hardness distribution state of each bag 20 in the normal posture shown in FIG. 4 is that the intermediate state 20B in the normal posture is not in the comfortable posture in the central portion in the left-right direction. In the ottoman 13, the bag body D11 and the bag body D12 are all in an expanded state 20A and are soft. As a result, the wobbling of the occupant body in the seat width direction during turning of the vehicle can be reduced as in the normal posture, and a feeling of being wrapped up can be produced as if sitting on a sofa.

  The embodiment configured as described above has the following operational effects. Based on the inclination angle of the seat back 12 with respect to the seat cushion 11 detected by the angle detecting means 30, the pump 50 and the electromagnetic valve 60 controlled by the control means 40 are operated to the seat cushion 11, the seat back 12 and the ottoman 13. The hardness of the provided bag body 20 can be set to an ideal distribution state that is a predetermined distribution state according to the tilt angle. Thus, the vehicle seat 10 is provided that can control the hardness of the occupant support surfaces of the seat cushion 11, the seat back 12, and the ottoman 13 to an ideal distribution state according to the inclination angle of the seat back 12 with respect to the seat cushion 11. be able to. Specifically, in the range from the normal posture to the comfortable posture in which the inclination angle of the seat back 12 with respect to the seat cushion 11 is 90 degrees to 170 degrees, the center portion in the left-right direction of the occupant support surface is softer than both sides. It is possible to reduce wobbling of the occupant's body in the left-right direction when the car turns. Further, in the range of the sleeping posture in which the seat back 12 is inclined from 170 degrees to 180 degrees with respect to the seat cushion 11, a plurality of belt-like portions having the same hardness in the left-right direction of the occupant support surface are arranged side by side in the front-rear direction. In addition, the belt-like portion corresponding to the occupant's waist is harder than the other belt-like portions. As a result, it is possible to prevent the waist part where the load is most applied in the occupant's body from sinking excessively, and to make it difficult for the parts other than the waist part to be crushed sideways or overturned. Further, the bag body 20 is formed by enclosing a large number of granular bodies 22 in a bag-like member 21. When air is introduced into the bag-like member 21, the gap between the granular bodies 22 is widened and softened, and when the air is removed, the gap between the granular bodies 22 is narrowed and hardened. Thereby, the hardness of the passenger | crew support surface of the seat cushion 11, the seat back 12, and the ottoman 13 can be controlled with a simple structure.

  In FIG. 7, the block diagram which shows schematic structure of the hardness change mechanism 101 of 2nd Embodiment of this invention is shown. The structure common to the hardness changing mechanism 100 of the first embodiment is denoted by the corresponding reference numeral, and detailed description thereof is omitted. FIG. 8 shows a resin structure 80 arranged at the same position instead of the bag body 20 in the first embodiment. The resin structure 80 is formed into a cubic shape as a whole by connecting unit cubes arranged in 12 side portions vertically and horizontally and connecting rod-like bodies formed of a resin whose elasticity modulus is changed by being softened by heating. It is a structure. The heater 70 is provided for each resin structure 80 and has a rectangular plate shape, and is connected to the control means 40 by an electric wiring 65 while being in contact with the resin structure 80. The control means 40 controls the temperature of the heater 70 by controlling energization to the heater 70 in accordance with the signal from the angle detection means 30. Specifically, the heater 70 softens the resin structure 80 as the temperature of the heater 70 increases. As a result, the hardness of the occupant support surfaces of the seat cushion 11, the seat back 12, and the ottoman 13 in which the resin structure 80 is disposed is lowered and softened. About an operation effect, it is the same as that of a 1st embodiment. Here, the resin structure 80 corresponds to “hardness changing means” in the claims.

  Next, although not an embodiment according to the present invention, a configuration of an automobile seat 10a having a hardness changing mechanism 200 having a configuration similar to the configuration of the hardness changing mechanism 100 and the hardness changing mechanism 101 described above is illustrated. A description will be given with reference to FIGS. About the structure which is common with the vehicle seat 10 of the said 1st Embodiment, a corresponding code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  As shown in FIGS. 9 to 12, the seat cushion 11a includes a cushion frame 11F, and a cushion pad 11P1 in which three cylindrical elastic members 20a as cushion materials disposed on the cushion frame 11F are arranged. And a cushion cover 11C. The cylindrical elastic member 20a has a plurality of compression coil springs S1 in the vertical direction on the inner cylinder side of the flexible cylindrical cylindrical body 20a1 on both sides in the left-right direction (sheet width direction). They are also arranged. In addition, the cylindrical elastic member 20a has a plurality of compression coil springs S2 that move up and down in the height direction at the inner cylinder side of the flexible cylindrical cylindrical body 20a2 at the center in the left-right direction (sheet width direction). It is arranged according to the direction. The compression coil spring S1 has a larger spring constant than the compression coil spring S2, and the cylindrical body 20a1 is harder than the cylindrical body 20a2. The portion of the cylindrical body 20a1 corresponds to the portion where the bag body C11, the bag body C12, and the bag body C13 of the first embodiment are disposed. The portion of the cylindrical body 20a2 corresponds to the portion where the bag body C21, the bag body C22, and the bag body C23 of the first embodiment are disposed. Therefore, the hardness distribution of the occupant support surface of the seat cushion 11a matches the hardness distribution of the occupant support surface of the seat cushion 11 in the comfort posture shown in FIG. 6 in the first embodiment.

  As shown in FIG. 9, the seat back 12a includes a back frame 12F, a back pad 12P1 on which four cylindrical elastic members 20b are disposed as cushioning materials disposed on the back frame 12F, and a back cover. 12C. The cylindrical elastic member 20b has a plurality of compression coil springs S1 on the inner cylinder side of the flexible cylindrical cylindrical body 20b1 on both sides in the left-right direction (sheet width direction). They are also arranged. In addition, the cylindrical elastic member 20b has a plurality of compression coil springs S1 extending in the vertical direction at the inner cylinder side of the flexible cylindrical cylindrical body 20b2 at the center in the left-right direction (sheet width direction). The plurality of compression coil springs S2 are arranged in accordance with the direction and the height direction is arranged substantially in the front-rear direction. Further, the cylindrical body 20b2 is rotatably supported with respect to the back frame 12F by a rotating shaft 20b3 extending in the left-right direction coinciding with the central axis, and the height direction of the compression coil spring S1 is always the vertical direction. A weight W is attached so as to be. The portion of the cylindrical body 20b1 corresponds to the portion where the bag body B11, the bag body B12, the bag body B13, and the bag body B14 of the first embodiment are disposed. Moreover, the part of the cylindrical body 20b2 corresponds to the part where the bag body B21, the bag body B22, the bag body B23, and the bag body B24 of the first embodiment are disposed. Accordingly, the hardness distribution of the occupant support surface of the seat back 12a is such that the portion of the cylindrical elastic member 20b2 is a compression coil spring in a normal posture where the inclination angle of the seat back 12 with respect to the seat cushion 11 is about 90 to 120 degrees. In S2, the occupant support surface is made soft, and in the sleeping position in which the inclination angle of the seat back 12 with respect to the seat cushion 11 is 170 degrees to 180 degrees, the portion of the cylindrical body 20b2 is made hard by the compression coil spring S1. And That is, the hardness distribution state of the occupant support surface of the seat back 12 can be changed according to the inclination angle of the seat back 12 with respect to the seat cushion 11 only by a mechanical configuration without using power such as electricity or air. In the seat back 12a, the back cover is in a state where no occupant is seated so that the cylindrical body 20b2 can rotate about the rotation shaft 20b3 in accordance with a change in the inclination angle of the seat back 12 with respect to the seat cushion 11. 12C and the cylindrical body 20b2 are not in contact with each other, and after tilting the seat back 12 with respect to the seat cushion 11, it is necessary to separate the body from the passenger support surface of the seat back 12.

  As shown in FIG. 9, the ottoman 13a includes an ottoman frame 13F, an ottoman pad 13P1 on which two cylindrical elastic members 20c as cushioning materials disposed on the ottoman frame 13F are arranged, and an ottoman cover 13C. And comprising. In the cylindrical elastic member 20c, a plurality of compression coil springs S2 are arranged on the inner cylinder side of a flexible cylindrical cylindrical body 20c1 extending in the left-right direction so that the height direction matches the front-rear direction. The portion of the cylindrical body 20c1 corresponds to the portion where the bag body D11 and the bag body D12 of the first embodiment are disposed. Accordingly, the hardness distribution of the occupant support surface of the ottoman 13a matches the hardness distribution of the ottoman support surface of the first embodiment.

  As mentioned above, although specific embodiment was described, this invention is not limited to those external appearances and structures, A various change, addition, and deletion are possible in the range which does not change the summary of this invention. For example, the following can be mentioned.

  1. In the above-described embodiment, the expanded state 20A, the intermediate state 20B, and the contracted state 20C of the bag body 20 have the same hardness. However, the present invention is not limited to this. Good.

  2. In the said embodiment, although the bag-shaped member 21 of the bag body 20 was formed as a substantially cube shape, you may make it not only this but a column shape, and the passenger | crew support surface side of a column shape may be a hemisphere.

  3. In the above embodiment, the present invention is applied to an automobile seat, but may be applied to a seat mounted on an airplane, a ship, a train, or the like.

10 Automotive seats (vehicle seats)
11 Seat cushion 11C Cushion cover (cover member)
11P Cushion pad 12 Seat back 12C Back cover (cover member)
12P back pad 20 bag (hardness changing means)
20A Inflated state 20B Intermediate state 20C Shrinked state 21 Bag-like member 22 Granular body 30 Angle detecting means 40 Control means 50 Pump 60 Electromagnetic valve 70 Heater 80 Resin structure (hardness changing means)
100 Hardness changing mechanism 101 Hardness changing mechanism F Floor

Claims (4)

A vehicle seat,
A seat cushion, a seat back coupled to the seat cushion so that the tilt angle can be changed, and an angle detection means capable of detecting the tilt angle of the seat back with respect to the seat cushion,
The seat cushion and / or the seat back are arranged on a cover member that constitutes an occupant support surface and a seat width direction of the occupant support surface and a direction perpendicular to the seat width direction. A plurality of hardness change means provided in the control unit, and a control means for controlling each hardness of the hardness change means to a predetermined distribution state according to the tilt angle based on a detection result by the angle detection means. The vehicle seat you have. 2. The predetermined distribution state according to claim 1, wherein the seat back direction center portion of the occupant support surface is compared with both side portions when the angle of the seat back with respect to the seat cushion is in the range of 90 degrees to 170 degrees. It is considered to be soft,
When the angle of the seat back with respect to the seat cushion is in the range of 170 degrees to 180 degrees, a plurality of belt-like portions having the same hardness in the seat width direction of the occupant support surface are arranged side by side in a direction perpendicular to the seat width direction. A vehicle seat in which the belt-like portion corresponding to the waist of the occupant is harder than the other belt-like portions.   3. The vehicle seat according to claim 1 or 2, wherein the hardness changing means is a bag body that changes hardness by taking air in and out of a flexible bag-like member in which a granular material is put.   3. The vehicle seat according to claim 1, wherein the hardness changing means is a resin structure that is softened by heating.

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