JP2018140752A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seat which enables displacement of a holding surface without using a movable plate.SOLUTION: A vehicle seat 100 includes: a fluid bag 10 having a first surface 11 and a first rear surface 12; and a fluid bag 20A having a second surface 21 and a second rear surface 22. The second rear surface 22 has: a center part 22C; a seat inner end part 22U located at the inner side of the vehicle seat; a seat outer end part 22T located at the outer side of the vehicle seat; and a rear surface joint part 22J1 located between the center part 22C and the seat inner end part 22U. The first surface 11 has a surface joint part 11J1 joined to the rear surface joint part 22J1; and an outer non-contact part 14 which faces a portion 23 of the second rear surface 22 which is located between the rear surface joint part 22J1 and the seat outer end part 22T.SELECTED DRAWING: Figure 6

Description

  The present disclosure relates to a vehicle seat, and more particularly, to a vehicle seat that displaces a holding surface using a fluid bag.

  As disclosed in JP-A-2015-058750 (Patent Document 1), a vehicle seat including a fluid bag, a fixed plate, a movable plate, and the like is known. In the vehicle seat disclosed in Patent Document 1, a fluid bag is disposed between a fixed plate and a movable plate, and the fluid bag expands by supplying fluid to the fluid bag. The holdability for the seated person can be obtained by rotating the movable plate inward in the seat width direction by utilizing the expansion of the fluid bag.

JP2015-058750A

  In the configuration disclosed in Japanese Patent Laid-Open No. 2015-058750 (Patent Document 1), the holding surface for holding the seated person is displaced by using the movable plate, so that the manufacturing cost is increased by the amount of the movable plate. The weight of the vehicle seat is increased by the amount of the movable plate.

  An object of the present disclosure is to provide a vehicle seat that can displace a holding surface that holds a seated person without using a movable plate.

  A vehicle seat according to the present disclosure is a vehicle seat having a holding surface capable of holding a seated person, and includes a base member and a portion that forms the holding surface, and is provided so as to cover the base member. A cover, and a first fluid bag and a second fluid bag disposed between the cover and the base member, wherein the first fluid bag and the second fluid bag are inflated and contracted. A fluid bag unit that displaces the holding surface in a direction away from and approaching the base member, wherein the first fluid bag includes a first surface and a first back surface, the first surface and the It is formed in a bag shape by joining the peripheral edges of the first back surface, the first back surface is located on the base member side, and the first surface is located on the holding surface side. 2 fluid bag is the second A peripheral surface of the second surface and the second back surface are joined together, and the second back surface is located on the first surface side, The second surface is disposed on the side of the portion forming the holding surface, and the second back surface has a central portion and a seat inner end located on the inside of the vehicle seat, A seat outer end located outside the vehicle seat; and a back joint located between the center and the seat inner end; and the first surface is joined to the back joint. And the outer non-joining portion facing the portion between the back joining portion and the sheet outer end portion of the second back surface.

  According to the vehicle seat, the holding surface for the seated person can be displaced by expanding and contracting the first fluid bag and the second fluid bag stacked on the first fluid bag. 2 The back surface has a back surface bonding portion located between the central portion and the sheet inner end portion, and the first surface is a portion between the back surface bonding portion and the sheet outer end portion of the second back surface. Therefore, it is possible to realize a holding surface that is inclined toward the outside from the center side of the vehicle seat with the first fluid bag and the second fluid bag.

  In the vehicle seat, the back surface joining portion has an annular or rectangular shape, a first opening is formed inside the back surface joining portion, and the surface joining portion has an annular or rectangular shape. The second opening may be formed inside the surface bonding portion, and the first opening and the second opening may be in communication with each other.

  According to the vehicle seat having the above-described characteristics, it is possible to supply and discharge the fluid to and from the first fluid bag and the second fluid bag with only one connecting pipe. Advantages such as reduction and simplification of the apparatus configuration can be obtained.

  The vehicle seat further includes a connection pipe connected to the first fluid bag, and the fluid supplied from the connection pipe to the inside of the first fluid bag has the first opening and the second opening. May be supplied to the inside of the second fluid bag.

  According to the vehicle seat having the above-described features, the connection pipe is connected to the first fluid bag disposed on the base member side, so that the connection pipe of the connection pipe is expanded and contracted when the first fluid bag and the second fluid bag are expanded and contracted. It can suppress that a position fluctuates greatly.

  In the vehicle seat, the first surface includes the first surface bonding portion and the second surface bonding portion, and the second back surface includes the first back surface bonding portion and the second back surface. The first surface bonding portion and the first back surface bonding portion are bonded to each other, the second surface bonding portion and the second back surface bonding portion are bonded to each other, and the center When the direction from the portion toward the outer edge of the sheet is a reference direction, the first back surface bonding portion and the second back surface bonding portion are arranged with a gap in a direction orthogonal to the reference direction. It may be arranged.

  According to the vehicle seat having the above characteristics, the first front surface and the second back surface are joined to each other at two locations, and the two joined portions are arranged side by side in the orthogonal direction. Therefore, the tensile force acting between the first surface and the second back surface during expansion can be dispersed to the two joints, and the second fluid bag can be stably expanded and contracted from the two joints. can do. Further, if the size of the opening provided in the sheet is large, the sheet is likely to be greatly deformed around the opening. If the opening is formed inside each of the two joints, the required opening area Will be provided at two positions apart from each other, sheet deformation will be reduced, and the first fluid bag and the second fluid bag may expand and contract while maintaining high flatness in the peripheral portion of the opening. It becomes possible.

  According to the vehicle seat of the present disclosure, the first fluid bag and the second fluid bag stacked on the first fluid bag expand and contract, so that the holding surface that holds the seated person can be displaced. .

1 is a perspective view showing a vehicle seat 100 according to Embodiment 1. FIG. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1 and represents a cross-sectional shape of the headrest 5 in the first embodiment. FIG. 3 is a front view showing a state seen from the front side of a fluid bag unit 30 arranged inside the headrest 5 in the first embodiment. It is a front view which shows the state which the fluid bag unit 30 in FIG. 3 decomposed | disassembled. It is a perspective view which shows the state which further decomposed | disassembled the fluid bag unit 30 in FIG. FIG. 3 is a cross-sectional view showing a state in which fluid is not supplied into fluid bags 10, 20A, and 20B in Embodiment 1 and these fluid bags are contracted. It is sectional drawing which shows the headrest 5Z1 in the comparative example 1, and respond | corresponds to FIG. It is sectional drawing which shows the headrest 5Z2 in the comparative example 2, and respond | corresponds to FIG. It is sectional drawing which shows the headrest 5Z3 in the comparative example 3, and respond | corresponds to FIG. It is a front view which shows 30 A of fluid bag units applied to the vehicle seat in Embodiment 2, and respond | corresponds to FIG. 3 in Embodiment 1. FIG. It is a front view which shows the fluid bag unit 30B applied to the vehicle seat in Embodiment 3, and respond | corresponds to FIG. It is a front view which shows 30 C of fluid bag units applied to the vehicle seat in Embodiment 4, and respond | corresponds to FIG. 3 in Embodiment 1. FIG. It is sectional drawing which shows fluid bag unit 30D etc. which are applied to the vehicle seat in Embodiment 5, and respond | corresponds to FIG. It is sectional drawing which shows the fluid bag unit 30 etc. which are applied to the vehicle seat in Embodiment 6, and respond | corresponds to FIG.

  Hereinafter, embodiments will be described with reference to the drawings. The same parts and corresponding parts are denoted by the same reference numerals, and redundant description may not be repeated.

[Embodiment 1]
FIG. 1 is a perspective view showing a vehicle seat 100 according to the first embodiment. The vehicle seat 100 includes a headrest 5, a seat back 6, and a seat cushion 7. The vehicle seat 100 can be used as an automobile seat, for example. The vehicle seat 100 has a holding surface capable of holding a seated person. The vehicle seat 100 of the present embodiment has holding surfaces 50, 60 and 70.

  The holding surface 50 is formed by an outer surface located on the front side of the headrest 5 and holds the seated person's head. The holding surface 50 includes a central portion 51 and a pair of side portions 52 and 53. The side portions 52 and 53 protrude forward with respect to the central portion 51 and hold the seated person's head held by the central portion 51 from both the left and right sides.

  The holding surface 60 is formed by an outer surface located on the front side of the seat back 6 and holds the seated person's torso. The holding surface 60 includes a central portion 61 and a pair of side portions 62 and 63. The side parts 62 and 63 protrude forward with respect to the central part 61 and hold the torso of the seated person held by the central part 61 from both the left and right sides.

  The holding surface 70 is formed by an outer surface located on the upper side of the seat cushion 7 and holds the leg of the seated person. The holding surface 70 includes a central portion 71 and a pair of side portions 72 and 73. The side parts 72 and 73 protrude upward with respect to the central part 71, and hold the legs of the seated person held by the central part 71 from both the left and right sides.

(Headrest 5)
FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, and represents the cross-sectional shape of the headrest 5 in the first embodiment. FIG. 3 is a front view showing the fluid bag unit 30 disposed inside the headrest 5 according to the first embodiment as viewed from the front side. FIG. 4 is a front view showing an exploded state of the fluid bag unit 30 in FIG. FIG. 5 is a perspective view showing a further disassembled state of the fluid bag unit 30 in FIG.

  Referring mainly to FIG. 2, the headrest 5 includes a base member 80, a cover 40, a fluid bag unit 30, and a connecting pipe 91 (FIGS. 3 to 5). The base member 80 has a plate-like shape extending along the vertical direction (gravity direction) and the horizontal direction (vehicle width direction), and is formed of, for example, a synthetic resin member and / or a metal member. The base member 80 may be formed of a foam material (urethane pad) in addition to or in place of these members. As the base member 80, a member thicker than the base member 80 shown in FIG. 2 or a member having a shape different from that of the base member 80 shown in FIG. 2 may be used.

  The fluid bag unit 30 includes the fluid bags 10, 20 </ b> A, and 20 </ b> B, and is disposed on the front surface side of the base member 80. The cover 40 is a member that forms the outer surface of the headrest 5, and is provided so as to cover the base member 80 and the fluid bags 10, 20A, 20B.

  The cover 40 includes a central portion 41, holding portions 42 and 43, side wall portions 44 and 46, and a back portion 45. The central portion 41 mainly holds the seated person's head. The holding parts 42 and 43 are respectively located on the left and right sides of the central part 41 in the vehicle width direction. The holding portions 42 and 43 have an outer surface shape that curves convexly toward the front side, and suppresses the seated person's head from moving left and right.

  The outer surface of the central portion 41 of the cover 40 forms a central portion 51 of the holding surface 50, and the outer surfaces of the holding portions 42 and 43 of the cover 40 form side portions 52 and 53 of the holding surface 50, respectively. . The center portion 41 and the holding portions 42 and 43 of the cover 40 correspond to portions that form the holding surface 50 (the center portion 51 and the side portions 52 and 53).

  The side wall portion 44 of the cover 40 is located between the holding portion 42 and the back portion 45, and the side wall portion 46 of the cover 40 is located between the holding portion 43 and the back portion 45. The side wall portions 44 and 46 extend in a direction substantially parallel to the vehicle longitudinal direction, and the rear portion 45 extends in a direction substantially parallel to the vehicle width direction.

(Fluid bag unit 30)
The fluid bag unit 30 includes fluid bags 10, 20 </ b> A, 20 </ b> B, and the fluid bags 10, 20 </ b> A, 20 </ b> B are disposed between the cover 40 and the base member 80. The fluid bag 20A is laminated on the front surface of the fluid bag 10, and the fluid bag 10 and 20A are inflated and contracted in a laminated state, whereby the center portion 41 of the cover 40 and the holding portion 42, that is, the center of the holding surface 50 The part 51 and the side part 52 are displaced in the direction away from the base member 80 (arrow AR1) and the approaching direction (arrow AR2).

  The fluid bag 20B is laminated on the front surface of the fluid bag 10, and the fluid bag 10 and 20B are expanded and contracted in a laminated state, whereby the center portion 41 of the cover 40 and the holding portion 43, that is, the center of the holding surface 50. The part 51 and the side part 53 are displaced in the direction away from the base member 80 (arrow AR1) and the approaching direction (arrow AR2).

(Fluid bag 10)
Referring mainly to FIG. 5, more specifically, the fluid bag 10 as the first fluid bag includes a top sheet 11 (first surface) and a back sheet 12 (first back surface). Also have a rectangular outer shape of the same size. The top sheet 11 includes a front surface 11M and a back surface 11N, and the back sheet 12 includes a front surface 12M and a back surface 12N (FIGS. 2 and 5).

  The peripheral edge 11P, 11Q, 11R, 11S on the back surface 11N side of the top sheet 11 is thermally welded, ultrasonic welded, high frequency welded, or adhesive to the peripheral edge 12P, 12Q, 12R, 12S on the front surface 12M side of the back sheet 12. Joined by. The peripheral edges 11P, 11Q, 11R, 11S, 12P, 12Q, 12R, and 12S are hatched with a plurality of diagonal lines in FIGS. 3 to 5 for convenience of illustration.

  The fluid bag 10 is formed in a bag shape by joining the peripheral edges of the top sheet 11 and the back sheet 12 to each other. The fluid bag 10 is formed by, for example, folding a sheet-like member having a rectangular shape near the center, and three sides of a portion corresponding to the top sheet 11 (first surface) of the sheet-like member, and the sheet-like member. Of these, the three sides of the portion corresponding to the back sheet 12 (first back surface) may be joined together to form a bag. The fluid bag 10 is disposed such that the back sheet 12 is positioned on the base member 80 side and the top sheet 11 is positioned on the holding surface 50 side (see FIG. 2). The connecting pipe 91 (FIGS. 3 to 5) is disposed between the top sheet 11 and the back sheet 12, and communicates the internal space of the fluid bag 10 with a pump or the like (not shown).

  The topsheet 11 constituting the fluid bag 10 includes a central portion 11C having a predetermined surface area, and the topsheet 11 is symmetrical in the longitudinal direction (in the vehicle width direction) with the central portion 11C as the center of symmetry. It has a shape. Specifically, the topsheet 11 includes a central portion 11C located at the center in the longitudinal direction and outer end portions 11T (see FIG. 5) located on both outer sides in the longitudinal direction of the topsheet 11.

  One outer end portion 11T is located at an end portion on the peripheral edge 11Q side with respect to the central portion 11C, and surface joint portions 11J1 and 11J2 are provided between the one outer end portion 11T and the central portion 11C. . The other outer end portion 11T is located at the end portion on the peripheral edge 11S side with respect to the central portion 11C, and another surface bonding portion 11J1, 11J2 is provided between the other outer end portion 11T and the central portion 11C. Provided.

  The fluid bag 10 and the fluid bag 20A are joined to each other via the front surface joint portions 11J1 and 11J2 located on the peripheral edge 11Q side of the fluid bag 10 and the back surface joint portions 22J1 and 22J2 provided on the fluid bag 20A. The fluid bag 10 and the fluid bag 20B are joined to each other via the front surface joint portions 11J1 and 11J2 located on the peripheral edge 11S side of the fluid bag 10 and the back surface joint portions 22J1 and 22J2 provided on the fluid bag 20B.

  Each of the surface joint portions 11J1 and 11J2 provided in the fluid bag 10 has an annular shape. The surface bonding portions 11J1 and 11J2 may have a rectangular shape. The surface bonding portions 11J1 and 11J2 are hatched with a plurality of oblique lines in FIGS. 3 to 5 for convenience of illustration. First opening portions 11H1 and 11H2 are respectively formed inside the surface bonding portions 11J1 and 11J2 of the surface sheet 11 (FIGS. 2 and 5).

(Fluid bag 20A and fluid bag 20B)
As described above, the fluid bags 20A and 20B are stacked on the front surface of the fluid bag 10, and the fluid bags 10, 20A and 20B expand and contract, so that the central portion 41 of the cover 40 and the holding portions 42 and 43, that is, the holding surface. The center part 51 and the side parts 52 and 53 of 50 are displaced in the direction away from the base member 80 (arrow AR1) and the approaching direction (arrow AR2).

  The fluid bag 20B has the same configuration as the fluid bag 20A. In the following description, the configuration of the fluid bag 20A and the joint structure between the fluid bag 10 and the fluid bag 20A will be mainly described. Regarding the configuration of the fluid bag 20B and the joint structure between the fluid bag 10 and the fluid bag 20B, only the same or corresponding reference numerals as those of the fluid bag 20A are attached in the drawing, and the description of the fluid bag 20B will be made. The description overlapping the description of the fluid bag 20A will not be repeated as appropriate.

  The fluid bag 20A as the second fluid bag includes a top sheet 21 (second surface) and a back sheet 22 (second back surface), both of which have a rectangular outer shape of the same size. The top sheet 21 includes a front surface 21M and a back surface 21N, and the back sheet 22 includes a front surface 22M and a back surface 22N (FIGS. 2 and 5).

  The peripheral edges 21P, 21Q, 21R, 21S (FIG. 5) on the back surface 21N side of the top sheet 21 are thermally welded, ultrasonic welded, high frequency welded to the peripheral edges 22P, 22Q, 22R, 22S on the front surface 22M side of the back sheet 22. Or it joins with an adhesive agent etc. The peripheral edges 21P, 21Q, 21R, 21S, 22P, 22Q, 22R, and 22S are hatched with a plurality of diagonal lines in FIGS. 3 to 5 for convenience of illustration.

  The fluid bag 20A is formed in a bag shape by joining the peripheral edges of the top sheet 21 and the back sheet 22 to each other. The fluid bag 20A, for example, is a sheet-like member having a rectangular shape folded back near the center, and the three sides of the portion corresponding to the surface sheet 21 (second surface) of the sheet-like member and the sheet-like member It may be formed in the bag shape by mutually joining three sides of the portion corresponding to back sheet 22 (second back surface). In the fluid bag 20 </ b> A, the back sheet 22 is positioned on the top sheet 11 side, and the top sheet 21 is positioned on the side of the cover 40 that forms the holding surface 50 (the central portion 41 and the holding portion 42). (See FIG. 2).

  The lengths of the top sheet 21 and the back sheet 22 that are constituent elements of the fluid bag 20A in the longitudinal direction (vertical direction in FIG. 3) are short of the top sheet 11 and the back sheet 12 that are constituent elements of the fluid bag 10. This is the same as the length in the direction (vertical direction in FIG. 3). The length of the top sheet 21 and the back sheet 22 in the short direction (left and right direction in FIG. 3) is shorter than the length of the top sheet 11 and back sheet 12 in the longitudinal direction (left and right direction in FIG. 3).

  The back sheet 22 that is a component of the fluid bag 20A is disposed so as to oppose the portion on the peripheral edge 11Q side of the fluid bag 10 (the top sheet 11), and the back sheet 22 that is a component of the fluid bag 20B is a fluid bag. 10 (surface sheet 11) is disposed so as to face the peripheral edge 11S side. The back sheet 22 has a center portion 22C positioned in the center in the short direction of the back sheet 22 (here, the width direction of the vehicle seat 100) and sheet outer ends positioned on both outer sides in the short direction of the back sheet 22. Portion 22T and sheet inner end portion 22U (see FIG. 5), and back surface bonding portions 22J1 and 22J2 positioned between center portion 22C and sheet inner end portion 22U and bonded to surface bonding portions 11J1 and 11J2, respectively. Including. In a state where the fluid bag 20A is mounted on the vehicle seat 100, the seat outer end portion 22T is positioned on the outer side in the width direction of the vehicle seat 100, and the seat inner end portion 22U is on the inner side in the width direction of the vehicle seat 100. To position.

  Each of the back surface bonding portions 22J1 and 22J2 has an annular shape. The back surface bonding portions 22J1 and 22J2 may have a rectangular shape. The back junctions 22J1 and 22J2 are hatched with a plurality of diagonal lines in FIGS. 3 to 5 for convenience of illustration. Second openings 22H1 and 22H2 are respectively formed inside the back surface bonding portions 22J1 and 22J2 of the back surface sheet 22 (FIGS. 2 and 5). The second opening portions 22H1 and 22H2 have the same opening area as the first opening portions 11H1 and 11H2, respectively, and the fluid bag 10 and the fluid bag 20A are joined to each other so that the opening portions coincide with each other and communicate with each other. Yes.

  The topsheet 11 of the present embodiment has an outer non-joining portion 13 and an inner non-joining portion 14. The outer non-joining portion 13 is located between the surface joining portions 11J1 and 11J2 and the outer end portion 11T, and the inner non-joining portion 14 is located between the surface joining portions 11J1 and 11J2 and the central portion 11C. In a state where the front surface bonding portions 11J1 and 11J2 are respectively bonded to the back surface bonding portions 22J1 and 22J2 (FIG. 2), the outer non-bonding portion 13 includes the back surface bonding portions 22J1 and 22J2 and the sheet outer edge portion 22T of the back surface sheet 22. The inner non-joining portion 14 faces the portion 24 between the back face joining portions 22J1 and 22J2 and the sheet inner end portion 22U of the back face sheet 22 (see FIGS. 3 to 5). (FIGS. 3 to 5).

  When the fluid bag 10 and the fluid bag 20A are joined to each other and the direction from the central portion 22C of the back sheet 22 toward the sheet outer end 22T is a reference direction DR1 (FIG. 3), the width in the reference direction DR1 is The portion 24 between the back surface bonding portions 22J1 and 22J2 and the sheet inner end portion 22U of the back surface sheet 22 is between the back surface bonding portions 22J1 and 22J2 and the sheet outer end portion 22T of the back surface sheet 22. It is narrower than the portion 23. In other words, in the back surface sheet 22, the distance (the width of the portion 24) between the sheet inner end portion 22 </ b> U located on the center side in the width direction of the vehicle sheet 100 and the back surface joint portions 22 </ b> J <b> 1 and 22 </ b> J <b> 2 is as follows. Among these, it is narrower than the space | interval (width | variety of the part 23) between the sheet | seat outer side edge part 22T located in the width direction of the vehicle seat 100, and back surface junction part 22J1, 22J2. That is, the back surface bonding portions 22J1 and 22J2 are provided in the portion of the back surface sheet 22 near the sheet inner end portion 22U.

  As shown in FIG. 3 and FIG. 4, in the present embodiment, in the state in which these fluid bags are contracted without fluid being supplied into the fluid bags 10, 20A, 20B, the sheet outer end portion of the fluid bag 20A. 22T is located so as to extend substantially along (substantially overlap) the outer end 11T on the peripheral edge 11Q side of the fluid bag 10 (surface sheet 11), and the sheet outer end 22T of the fluid bag 20B 10 (surface sheet 11) is positioned so as to extend substantially along (substantially overlap) the outer end 11T on the peripheral edge 11S side.

  Similarly to the above, the front surface bonding portion 11J1 (first surface bonding portion) and the back surface bonding portion 22J1 (first back surface bonding portion) are bonded to each other, and the front surface bonding portion 11J2 (second surface bonding portion) and the back surface A direction from the center portion 22C of the back sheet 22 toward the sheet outer end portion 22T in the state where the bonding portion 22J2 (second back surface bonding portion) is bonded to each other is defined as a reference direction DR1 (FIG. 3).

  In the present embodiment, back junction 22J1 (first back junction) and back junction 22J2 (second back junction) are spaced apart in direction DR2 perpendicular to reference direction DR1. They are arranged side by side. Similarly, the surface bonding portion 11J1 (first surface bonding portion) and the surface bonding portion 11J2 (second surface bonding portion) are arranged so as to be arranged at intervals in a direction DR2 orthogonal to the reference direction DR1. Has been.

(Shrinked state and expanded state)
FIG. 6 is a cross-sectional view showing a state in which the fluid bags are contracted without being supplied to the fluid bags 10, 20 </ b> A, and 20 </ b> B in the first embodiment. In the present embodiment, a connecting pipe 91 (FIGS. 3 to 5) connects the fluid bag 10 and a pump (not shown). The fluid (typically air) supplied from the pump to the inside of the fluid bag 10 through the connecting pipe 91 is a first opening 11H1, 11H2 (FIGS. 3 to 5) and a second opening 22H1, 22H2 (FIG. 3). Through FIG. 5), the fluid is supplied into the fluid bags 20A and 20B.

  In FIG. 6, the contracted state of the fluid bags 10, 20 </ b> A, 20 </ b> B is illustrated using solid lines, and the expanded state of the fluid bags 10, 20 </ b> A, 20 </ b> B is illustrated using broken lines (dotted lines). Are shown. The state in which the cover 40 is contracted with the contraction of each fluid bag is illustrated using a one-dot chain line, and the state in which the cover 40 is expanded with the expansion of each fluid bag is illustrated with a two-dot chain line. Used to illustrate.

  Here, the position where the topsheet 21 of the fluid bag 20A is disposed in the state in which the fluid bag 10 and the fluid bags 20A and 20B are contracted is set as a reference position. In a state where the fluid bag 10 and the fluid bags 20A and 20B are expanded by supplying the fluid through the connection pipe 91 (FIGS. 3 to 5), the portion 23 (outer non-joining portion) of the back sheet 22 of the fluid bag 20A and 20B. 13) is displaced in a direction away from the top sheet 11 of the fluid bag 10 as indicated by a dotted line in FIG. 6 (or as shown in FIG. 2).

  In the state in which the fluid bag 10 and the fluid bags 20A and 20B are inflated, the top sheet 21 of the fluid bag 20A and 20B further has an end portion (in other words, of the top sheet 21 of the top sheet 21). Compared to the distance L1 between the seat inner end 22U located on the central portion 11C side and the reference position, the end located outside the vehicle seat 100 (in other words, the outer end of the topsheet 21) The distance L2 between the sheet outer end 22T) located on the 11T side and the reference position is displaced so as to be wider.

  In other words, the position of the peripheral edge 21S of the topsheet 21 when the fluid bag 10 and the fluid bags 20A, 20B are inflated and the peripheral edge 21S of the topsheet 21 when the fluid bag 10 and the fluid bags 20A, 20B are contracted. The position of the peripheral edge 21Q of the topsheet 21 and the fluid bag 10 and the fluid bag 20A, when the fluid bag 10 and the fluid bags 20A and 20B are inflated, compared to the interval L1 between the position of The distance L2 between the position of the peripheral edge 21Q of the topsheet 21 when the 20B is contracted (that is, the reference position) is wider.

(Function and effect)
According to the vehicle seat 100 of the present embodiment, the fluid bag 10 and the fluid bags 20A and 20B disposed at both ends in the longitudinal direction of the fluid bag 10 are inflated to have a concave shape. The holding surface 50 (the center part 51 and the side parts 52 and 53) can be formed. Even if the movable plate is not used intentionally (even when the configuration without the movable plate is adopted), the holding surface 50 with respect to the seated person's head is displaced by the expansion and contraction of the fluid bag 10 and the fluid bags 20A and 20B. It is possible. Therefore, when the structure which does not have a movable plate is employ | adopted in the vehicle seat 100, it becomes possible to reduce the manufacturing cost for the movable plate, or to reduce the weight of the movable plate. Further, the vehicle seat of the top sheet 21 is larger than the distance L1 between the inner sheet end 22U located on the inner side (center side 11C side) of the vehicle seat 100 of the top sheet 21 and the reference position. Since the distance L2 between the sheet outer end 22T positioned outside the 100 (outer end 11T side) and the reference position is wider, the sheet is inclined in a specific direction that is inclined from the central side toward the outer side. The holding surface 50 can be realized by expansion and contraction of the fluid bag 10 and the fluid bags 20A and 20B.

[Comparative example]
Hereinafter, the further superiority of the vehicle seat 100 according to the first embodiment will be described while comparing the first embodiment with Comparative Examples 1 to 3.

(Comparative Example 1)
FIG. 7 is a cross-sectional view showing the headrest 5Z1 in the comparative example 1, and corresponds to FIG. 6 in the first embodiment. Comparative Example 1 and Embodiment 1 are different in the following points.

  In the first embodiment, a back surface bonding portion 22J1 is provided between the center portion 22C and the sheet inner end portion 22U in the width direction of the back surface sheet 22. On the other hand, in the comparative example 1, the back surface joining part 22J1 is provided in the center in the width direction of the back surface sheet 22 (at the position of the center part 22C). Thereby, in the state which fluid bag 10 and fluid bags 20A and 20B have expanded, surface sheet 21 of fluid bags 20A and 20B is inside the sheet 100 for vehicles among surface sheets 21 (center part 11C side). The seat outer end 22T located on the outer side (outer end 11T side) of the vehicle seat 100 in the topsheet 21 and the reference position, compared to the distance L1 between the seat inner end 22U and the reference position. The gap L2 is displaced so as to be narrower.

  When the fluid bag 10 is inflated, inclined surfaces R1 and R2 are formed on the outer end portion 11T side of the fluid bag 10 (surface sheet 11). The inclined surfaces R1 and R2 have a surface shape that is inclined obliquely from the front side toward the rear side (retreats) from the central portion 11C side toward the outer end portion 11T side. The fluid bags 20A and 20B in Comparative Example 1 are provided with a back surface bonding portion 22J1 at the center in the width direction of the back surface sheet 22, and the surface bonding portions 11J1 and 11J2 and the back surface bonding portions 22J1 and 22J2 are in the inclined surfaces R1 and R2. When the fluid bag 10 and the fluid bags 20A, 20B are inflated, the fluid bags 20A, 20B are inflated so as to spread outward in the direction away from the central portion 11C. Yes.

  Therefore, in the first comparative example, the distance L2 is narrower than the distance L1, and as a result, the holding surface 50 moves from the central portion 51 toward the side portions 52 and 53 as compared with the case of the first embodiment. The degree of gentle inclination is exhibited, and the depth of the concave portion of the central portion 51 of the holding surface 50 is shallower in the case of the first comparative example than in the first embodiment. In contrast to the movement of the head of the seated person to the left and right, in the case of the comparative example 1, it is difficult to apply a sufficient regulating force as compared with the case of the first embodiment.

  Also in the vehicle seat 100 according to the first embodiment, when the fluid bag 10 is inflated, inclined surfaces R1 and R2 are formed in a portion near the outer end portion 11T of the fluid bag 10 (surface sheet 11) (see FIG. 6). However, in the fluid bags 20A and 20B of the first embodiment, the back surface bonding portion 22J1 is provided between the center portion 22C and the sheet inner end portion 22U in the width direction of the back surface sheet 22, and the front surface bonding portions 11J1 and 11J2 and the back surface The joining portions 22J1 and 22J2 are located on the inner side (closer to the central portion 11C) than in the case of the first comparative example. It is less affected by the inclined surfaces R1 and R2 at the time of expansion, and a configuration is realized in which the interval L2 is wider than the interval L1, and is directed from the central portion 51 side to the side portions 52 and 53 side. Accordingly, it is possible to realize the holding surface 50 that is inclined more steeply than the case of the comparative example 1 with the fluid bag 10 and the fluid bags 20A and 20B.

  In Embodiment 1, the space | interval (width | variety of the part 24) between the sheet | seat inner side edge part 22U of the back surface sheet 22 and back surface junction part 22J1, 22J2 is the sheet | seat outer side edge part 22T of the back surface sheet 22, and back surface junction part 22J1. , 22J2 (the width of the portion 23) is narrower. That is, the back surface bonding portions 22J1 and 22J2 are provided in the portion of the back surface sheet 22 near the sheet inner end portion 22U.

  Therefore, when the fluid bag 10 and the fluid bags 20A and 20B are inflated, the fluid bags 20A and 20B are inflated so as to stand forward (the wider portion 23 is closer to the narrower portion 24). The holding surface 50 is inclined more steeply than the case of the first comparative example as it goes from the central part 51 side to the side parts 52 and 53 side. , 20B. Therefore, in contrast to the case where the seated person's head moves to the left and right, in the case of the first embodiment, it is possible to apply a sufficient regulating force as compared with the case of the comparative example 1.

(Comparative Example 2)
FIG. 8 is a cross-sectional view showing the headrest 5Z2 in the comparative example 2, and corresponds to FIG. 6 in the first embodiment. Comparative Example 2 and Embodiment 1 are different in the following points.

  In the headrest 5Z2, the displacement of the holding surface 50 is realized using the fluid bags 10A and 10B. The fluid bag 10A is provided outside the fluid bag 10B in the width direction, and the deformation amount of the fluid bag 10A is larger than the deformation amount of the fluid bag 10B. Even with this configuration, a certain degree of regulation force can be applied to the seated person's head moving left and right.

  However, the headrest 5Z2 does not employ a configuration in which a plurality of fluid bags are stacked on the front and back, so it is difficult to increase the range in which the holding surface 50 can be displaced compared to the case of the first embodiment. .

(Modification of Embodiment 1)
In order to increase the range in which the holding surface 50 can be displaced, as a modification of the first embodiment, instead of the fluid bags 20A and 20B in the first embodiment, the fluid bags 10A and 10B shown in FIG. You may adopt. That is, the fluid bag 10A is disposed outside the fluid bag 10B in the width direction, and the deformation amount of the fluid bag 10A is set to be larger than the deformation amount of the fluid bag 10B. The fluid bag 10 in the first embodiment is arranged between the fluid bags 10A and 10B having such a configuration and the base member 80, and compared with the interval L1 as in the case of the first embodiment. You may implement | achieve the structure that the space | interval L2 is wider. In this case, for example, the fluid bag 10A corresponds to the second fluid bag.

(Comparative Example 3)
FIG. 9 is a cross-sectional view showing headrest 5Z3 in comparative example 3, and corresponds to FIG. 6 in the first embodiment. Comparative Example 3 and Embodiment 1 are different in the following points.

  The headrest 5Z3 includes a fluid bag 10A and a movable plate 82 that is rotatably supported by a hinge 81. The headrest 5Z3 corresponds to the configuration disclosed in Japanese Patent Laid-Open No. 2015-058750 (Patent Document 1) described at the beginning, and the movable plate 82 is rotated using the fluid bag 10A. Since the holding surface for the seated person is displaced using this, the manufacturing cost is increased by the movable plate 82, or the weight of the vehicle seat is increased by the movable plate 82.

  On the other hand, according to the vehicle seat 100 of the first embodiment, the fluid bag 10 and the fluid bags 20A and 20B arranged so as to be laminated at both ends in the longitudinal direction of the fluid bag 10 are inflated. Can form the holding surface 50 (the central portion 51 and the side portions 52 and 53) having a concave shape, so even if the movable plate is not used dare (in the case of adopting a configuration without the movable plate). It is possible to displace the holding surface relative to the seated person's head.

  Therefore, when the structure which does not have a movable plate is employ | adopted in the vehicle seat 100, it becomes possible to reduce the manufacturing cost for the movable plate, or to reduce the weight of the movable plate. The technical idea in the first embodiment is that the fluid bag 10 and the holding surfaces having a concave shape by inflating the fluid bags 20A and 20B respectively disposed at both ends in the longitudinal direction of the fluid bag 10. 50 (the central portion 51 and the side portions 52 and 53), and a configuration in which a movable plate is further added to the configuration of the first embodiment is positive from the disclosure scope of the present specification or the claims. It is not something that is excluded.

[Embodiment 2]
FIG. 10 is a front view showing a fluid bag unit 30A applied to the vehicle seat in the second embodiment, and corresponds to FIG. 3 in the first embodiment. The first and second embodiments are different in the following points.

  In the second embodiment, the fluid bag 20A and the fluid bag 10 are bonded to each other via one surface bonding portion 11J and one back surface bonding portion 22J. A first opening 11H is formed inside the front surface bonding portion 11J, and a second opening 22H is formed inside the back surface bonding portion 22J, and these openings communicate with each other. The same applies to the fluid bag 20B and the fluid bag 10. The front surface bonding portion 11J and the back surface bonding portion 22J are formed to extend along a direction DR2 orthogonal to the reference direction DR1. Even with this configuration, the back surface bonding portion 22J is provided between the center portion 22C and the sheet inner end portion 22U in the width direction of the back surface sheet 22, so that substantially the same operations and effects as those of the first embodiment can be obtained. it can.

  In the case of the first embodiment, as described above, the back surface bonding portion 22J1 (first back surface bonding portion) and the back surface bonding portion 22J2 (second back surface bonding portion) are in the direction DR2 orthogonal to the reference direction DR1. Are arranged so as to be arranged at intervals. Similarly, the surface bonding portion 11J1 (first surface bonding portion) and the surface bonding portion 11J2 (second surface bonding portion) are arranged so as to be arranged at intervals in a direction DR2 orthogonal to the reference direction DR1. Has been. Since the top sheet 11 and the back sheet 22 are joined to each other at two locations, and the two joints are arranged side by side in the orthogonal direction, the top sheet 11 and the back sheet 22 The tensile force acting between the two points can be dispersed in the two joints, and the fluid bag 20A can be expanded and contracted stably starting from the two joints.

  A portion where the opening (the first opening or the second opening) is formed in the fluid bag 10 or the fluid bags 20A and 20B has low rigidity. If the size of the opening is large, the sheet is likely to be greatly deformed around the opening. If the opening is formed inside each of the two joints, the opening having the necessary opening area is separated. Accordingly, the sheet deformation is reduced, and the fluid bag 10 and the fluid bag 20A can be inflated and contracted while maintaining a high flatness in the peripheral portion of the opening.

[Embodiment 3]
FIG. 11 is a front view showing a fluid bag unit 30B applied to the vehicle seat in the third embodiment, and corresponds to FIG. 3 in the first embodiment. The third embodiment is different from the first and second embodiments in the following points.

  In the third embodiment, the fluid bag 10 and the fluid bag 20A do not communicate with each other, and the fluid bag 10 and the fluid bag 20B do not communicate with each other. Connection pipes 91, 92, 93 for expanding and contracting the fluid bags 10, 20A, 20B are connected to the fluid bags 10, 20A, 20B, respectively. Also by this configuration, the back surface joining portion 22J is provided between the center portion 22C and the sheet inner end portion 22U in the width direction of the back surface sheet 22, so that substantially the same operations and effects as in the first and second embodiments are obtained. be able to.

  In the case of the first and second embodiments, as described above, the fluid (typically air) supplied from the pump to the inside of the fluid bag 10 through the connection pipe 91 is the first openings 11H1 and 11H2 (FIG. 3). 5) and the second openings 22H1 and 22H2 (FIGS. 3 to 5), the fluid is supplied into the fluid bags 20A and 20B. According to this configuration, it is possible to supply and discharge the fluid to and from the fluid bags 10, 20A, and 20B with only one connecting pipe 91, making the fluid bag unit thinner, reducing manufacturing costs, and simplifying the device configuration. Advantages such as can be obtained. On the other hand, in the case of Embodiment 3, each of the fluid bags 10, 20 </ b> A, and 20 </ b> B can be expanded and contracted independently by using the connection pipes 91, 92, and 93.

  In the first and second embodiments, since the fluid bag 10 is disposed on the base member 80 side with respect to the fluid bags 20A and 20B, the connection pipe 91 is connected only to the fluid bag 10, so that the fluid bag 10 It is also possible to prevent the position of the connecting pipe 91 from greatly fluctuating when the bags 10, 20A, 20B are expanded and contracted. In the first and second embodiments, the connecting pipe 91 may be connected to the fluid bag 20A or the fluid bag 20B as necessary.

[Embodiment 4]
FIG. 12 is a front view showing a fluid bag unit 30C applied to the vehicle seat in the fourth embodiment, and corresponds to FIG. 3 in the first embodiment. The fourth embodiment is different from the first to third embodiments in the following points.

  In the fourth embodiment, the back surface joining portion 22J is formed so as to reach the sheet inner end portion 22U of the back surface sheet 22, and the back surface sheet 22 is between the back surface joining portion 22J and the sheet inner end portion 22U. The portion 24 is not provided, and only the portion 23 between the back surface joining portion 22J and the sheet outer end portion 22T is provided. Even with this configuration, the back surface bonding portion 22J is provided between the center portion 22C and the sheet inner end portion 22U in the width direction of the back surface sheet 22, so that substantially the same operations and effects as those of the first embodiment can be obtained. it can.

[Embodiment 5]
FIG. 13 is a cross-sectional view showing a fluid bag unit 30D applied to the vehicle seat in the fifth embodiment, and corresponds to FIG. 6 in the first embodiment. The fifth embodiment is different from the first to third embodiments in the following points.

  In the fifth embodiment, a fluid bag 20S is provided between the fluid bag 20A and the fluid bag 10, and a fluid bag 20T is provided between the fluid bag 20B and the fluid bag 10. The fluid bags 20S and 20T can function as, for example, a third fluid bag, and include a portion 23 of the back sheet 22 (a portion 23 facing the outer non-joining portion 13) and an outer non-joining portion 13 of the fluid bag 10. It is arranged between.

  When the fluid bags 10, 20A, 20B are inflated, the fluid bags 20S, 20T are also inflated together, thereby pressing the portion of the fluid bags 20A, 20B on the seat outer end 22T side toward the front side, and the interval L1 The distance L2 is wider than the distance L2, and as a result, substantially the same operations and effects as in the first embodiment can be obtained.

[Embodiment 6]
FIG. 14 is a cross-sectional view showing a fluid bag unit 30 applied to the vehicle seat in the sixth embodiment, and corresponds to FIG. 6 in the first embodiment. The sixth embodiment differs from the first to fifth embodiments in the following points.

  In the sixth embodiment, one fluid bag unit 30 is configured by laminating one fluid bag 10 and one fluid bag 20. One fluid bag unit 30 is disposed on each of one side and the other side of the base member 80 in the width direction. Even with this configuration, the back surface bonding portion 22J is provided between the center portion 22C and the sheet inner end portion 22U in the width direction of the back surface sheet 22, so that substantially the same operations and effects as those of the first embodiment can be obtained. it can.

[Other embodiments]
Each of the above embodiments has been described based on the configuration in which the holding surface 50 of the headrest 5 is displaced. However, the technical idea disclosed in each of the above embodiments (see FIG. 1) is the holding surface of the seat back 6. The present invention can be applied to a configuration in which 60 is displaced, and can also be applied to a configuration in which the holding surface 70 of the seat cushion 7 is displaced. The technical idea disclosed in each of the above-described embodiments can be applied to a so-called ottoman that holds a calf or the like of a seated person. The idea disclosed in each of the above embodiments can be applied to, for example, a mechanism in which a holding surface (an ottoman body itself) provided in an ottoman is rotated in the bending and extending directions of the knee. When the ottoman is provided with a recess that massages the calf of the seated person, it is possible to apply the technical idea disclosed in the above-described embodiments to the holding surface in the recess.

  Each of the above-described embodiments has been described based on the configuration in which the fluid bags 20A and 20B are disposed at both ends in the longitudinal direction of the fluid bag 10. However, if necessary, one end of the fluid bag 10 in the longitudinal direction. A configuration in which only the fluid bag 20 </ b> A is disposed in the part may be employed. Even with this configuration, the back surface bonding portion 22J is provided between the center portion 22C and the seat inner end portion 22U in the width direction of the back surface sheet 22, so that it can be applied to any place of the seated person without using a movable plate. It is possible to displace the holding surface.

  The vehicle seats in the above embodiments are not limited to vehicles, and can be applied to any vehicle seat such as trains, ships, or vehicles used in amusement facilities.

  While the embodiments have been described above, the above disclosure is illustrative in all respects and not restrictive. The technical scope of the present disclosure is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  5, 5Z1, 5Z2, 5Z3 Headrest, 6 Seat back, 7 Seat cushion, 10 Fluid bag (first fluid bag), 10A, 10B Fluid bag, 11 Surface seat (first surface), 11C, 22C Central portion, 11H, 11H1, 11H2 First opening, 11J, 11J1, 11J2 Surface junction, 11M, 12M, 21M, 22M Front surface, 11N, 12N, 21N, 22N Back surface, 11P, 11Q, 11R, 11S, 12P, 12Q, 12R, 12S , 21P, 21Q, 21R, 21S, 22P, 22Q, 22R, 22S peripheral edge, 11T outer edge, 12 back sheet (first back surface), 13 outer non-joining part, 14 inner non-joining part, 20, 20A, 20B fluid Bag (second fluid bag), 20S, 20T fluid bag (third fluid bag), 21 surface sheet (second surface), 2 Back sheet (second back surface), 22H, 22H1, 22H2 Second opening, 22J, 22J1, 22J2 Back joint, 22T, 22U end, 23, 24 part, 30, 30A, 30B, 30C, 30D Fluid bag Unit, 40 Cover, 41, 51, 61, 71 Center part, 42, 43 Holding part, 44, 46 Side wall part, 45 Rear part, 50, 60, 70 Holding surface, 52, 53, 62, 63, 72, 73 Side, 80 base member, 81 hinge, 82 movable plate, 91, 92, 93 connecting pipe, 100 vehicle seat, AR1, AR2 arrow, DR1 reference direction, DR2 direction, L1, L2 spacing, R1, R2 inclined surface.

Claims (4)

A vehicle seat having a holding surface capable of holding a seated person,
A base member;
A cover that includes a portion that forms the holding surface and is provided to cover the base member;
The holding surface includes a first fluid bag and a second fluid bag disposed between the cover and the base member, and is expanded and contracted in a state where the first fluid bag and the second fluid bag are stacked. A fluid bag unit that displaces the base plate in a direction away from and in a direction of approaching the base member,
The first fluid bag includes a first surface and a first back surface, and is formed into a bag shape by joining peripheral edges of the first surface and the first back surface, and the first back surface on the base member side. Is arranged such that the first surface is located on the holding surface side,
The second fluid bag includes a second surface and a second back surface, and is formed into a bag shape by joining the peripheral edges of the second surface and the second back surface, and the second surface on the first surface side. The rear surface is located, and the second surface is disposed on the part side forming the holding surface of the cover,
The second back surface includes a central portion, a seat inner end located inside the vehicle seat, a seat outer end located outside the vehicle seat, the central portion, and the seat inner end. And having a back surface junction located between
The first surface includes a surface bonding portion bonded to the back surface bonding portion, and an outer non-bonding portion facing a portion between the back surface bonding portion and the sheet outer end portion of the second back surface. Have
Vehicle seat. The back junction has an annular or rectangular shape, and a first opening is formed inside the back junction,
The surface bonding portion has an annular or rectangular shape, and a second opening is formed inside the surface bonding portion,
The first opening and the second opening communicate with each other;
The vehicle seat according to claim 1. A connecting pipe connected to the first fluid bag;
The fluid supplied from the connection pipe to the inside of the first fluid bag is supplied to the inside of the second fluid bag through the first opening and the second opening.
The vehicle seat according to claim 2. The first surface includes the first surface bonding portion and the second surface bonding portion,
The second back surface includes the first back surface bonding portion and the second back surface bonding portion,
The first surface bonding portion and the first back surface bonding portion are bonded to each other,
The second surface bonding portion and the second back surface bonding portion are bonded to each other,
Assuming that the direction from the central portion toward the outer edge of the sheet is a reference direction, the first back surface bonding portion and the second back surface bonding portion are spaced apart in a direction perpendicular to the reference direction. Arranged side by side,
The vehicle seat according to any one of claims 1 to 3.

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