JP5521662B2 - Lumber support - Google Patents

Description

  The present invention relates to a lumbar support applied to a seat seat portion such as a chair.

  2. Description of the Related Art Conventionally, a seat having a lumbar support that supports a lumbar spine of a seated person (hereinafter referred to as a seated person) is known as a seat seat portion of a chair or the like (see Patent Document 1).

  This lumbar support is provided in the backrest surface of the seat back, and when the angle between the seat cushion and the seat back is constant, the lumbar vertebra of the seated person is appropriately supported from behind. The spine is held in a substantially S shape when viewed from the side.

  Even when the seat back is tilted rearward and the seated person wants to relax or the like, the seated person's lumbar spine is supported from behind by the lumbar support.

Japanese Utility Model No.3-112047

  However, in such a conventional lumbar support, even if the seat back is tilted rearward, the seated person's spine continues to bend in a substantially S-shape, so that a relaxing effect is not given.

  Accordingly, an object of the present invention is to provide a lumbar support that can be appropriately supported in response to a change in the sitting posture of a seated person caused by tilting the seat back backward.

In order to achieve the above object, in the lumbar support of the present invention , a seat back having a backrest surface moves between at least two positions, a normal seating position and a reclining position tilting backward from the normal seating position. The seat back is provided with a lower support portion that presses the lumbar vertebra at the lower body of the seated person forward .
This lumbar support has a lower lumbar support plate member, a rotating shaft member, and a lower interlocking mechanism.
The lower lumbar support plate member is formed by curving the backrest surface side into a convex shape, and constitutes the lower support portion on the back surface side of the backrest surface.
The pivot shaft member rotatably supports the lower lumbar support plate member.
The lower interlocking mechanism tilts the lower lumbar support plate member rearward with the rotating shaft member as a rotation center in conjunction with a reclining operation in which the backrest surface of the seat back moves between at least the two positions. To do.
When the seat back is in the normal seating position, the upper rim side of the lower lumbar support plate member presses from the back side of the backrest surface, thereby bending the lumbar vertebra forward.
When the seat back is tilted to the reclined position from the normal seating position, said lower interlocking mechanism linked to said reclining movement, together with the upper edge is rotated in a direction away from said back surface, the lower lumbar lower edge of the support plate member is rotated in a direction close to the backrest surface, that close the lumbar that is curved forward in a straight line.

According to the present invention, the lower lumbar support plate member constituting the lower support portion provided in the seat back is pressed from the back side of the backrest surface at the normal seating position, thereby lowering the upper body of the seated person. lumbar Ru was bent forward.

  For this reason, the lumbar vertebra of the seated person can be bent forward, and the spine can be held in a substantially S shape in a side view, and the human fatigue caused by sitting for a long time can be reduced physiologically.

Further, in the reclining position tilting backward from the normal seating position, the lower interlocking mechanism is interlocked with the reclining operation, and the lower lumbar support plate member is rotated to be bent forward . lumbar, that close to a straight line.

  Therefore, physiologically, the load on the lumbar spine can be reduced, and a relaxing effect can be given to the person who sits down.

Accordingly, the lower lumbar support plate member constituting the lower support portion can support a person who is seated appropriately in accordance with the change in the seating posture that occurs in response to the rearward tilt of the seat back.

FIG. 3 is a schematic perspective view illustrating the internal configuration of the seat back of the seat in the chair using the lumbar support according to the embodiment of the present invention. It is a chair using the lumbar support of an embodiment, and is a typical side view explaining the composition inside the seat back of a seat. FIG. 6 is a schematic side view for explaining the relationship between a seated person at a normal seating position and the lumbar support in the lumbar support of the embodiment. FIG. 5 is a schematic side view for explaining the relationship between a seated person at an intermediate seating position and the lumbar support in the lumbar support of the embodiment. It is a typical side view explaining the relationship between the seated person in the reclining position and the lumbar support in the lumbar support of the embodiment. In the lumbar support according to the embodiment, (a) is a normal seating position, (b) is a schematic side view showing an intermediate seating position (c), and a reclining position. The posture of the seated person at the normal seating position will be described in comparison with the state of the curvature of the spine, (a) is a partially transparent side view of the seated person, (b) is a schematic diagram modeling the skeleton, (c) ) Is a side view schematically showing the curvature of the spine linearly. The posture of the seated person in the reclining position will be described in comparison with the state of curvature of the spine, (a) is a partially transparent side view of the seated person, (b) is a schematic diagram modeling the skeleton, and (c). FIG. 3 is a side view schematically showing the curvature of the spine in a linear shape.

  Hereinafter, a lumbar support according to an embodiment of the present invention will be described with reference to the drawings.

  First, the overall configuration will be described with reference to FIGS. 1 to 8. A seat cushion 2 and a seat back 5 are provided in a chair 1 to which the lumbar support of this embodiment is applied.

  Among them, the seat cushion 2 includes a pair of left and right metal cushion frame members 2a, 2a, which are provided between the cushion frame members 2a, 2a and are elastically deformable (not shown). On the upper surface side of the cushion material, there is provided a seating surface 2c on which a seated person HU (hereinafter referred to as a seated person HU) sits down with his buttocks HC down.

  In the vicinity of the rear end edge of the seat cushion 2, mounting wall surface portions 2d and 2d extending so as to be integrated with the cushion frame members 2a and 2a are provided.

  The mounting wall surface portions 2d and 2d are provided with rotating shaft portions 4 and 4, and the lower end portions 5a and 5a of the seat back 5 constituting the chair 1 together with the seat cushion 2 are rotated. The shafts 4 and 4 are pivotally supported so as to be rotatable.

  Also, as shown in FIG. 3, the seat back 5 has a dimension h that is substantially the same as the length dimension of the seated person's spine HS as a set dimension in the vertical direction from the lower end 5a to the upper end 5b. ing.

  Further, the seat back 5 is provided with a metal seat back frame member 6 having a substantially portal shape when viewed from the front.

  As shown in FIG. 1, the seat back frame member 6 extends in the horizontal direction and is paired with a pair of left and right extending in the vertical direction by a pipe-shaped shoulder frame material 6 a constituting the upper frame. The upper edges of the backside frame members 6b and 6b are connected so as to be integrated.

  Further, the lower end portions 6c and 6c of the back side frame members 6b and 6b are pivotally supported around the rotation shaft portions 4 and 4 as rotation centers.

  Further, a headrest member 7 is attached to the upper end portion 5 b of the seat back 5.

  A general reclining mechanism (not shown) is used, and the seat back 5 is configured to be tiltable by being rotated forward or backward.

  Further, a seat skin material 5c covering the periphery of the seat back frame member 6 is curved in a substantially S shape in a side view shown in FIG. A formed backrest surface 8 is provided.

  The seat back 5 of the chair 1 according to this embodiment is mainly provided with a lower support portion 11 that presses the lumbar vertebra at the lower body of the seated person toward the front, and above the lower support portion 11. The lumbar support mechanism 10 is configured with the upper support portion 21.

  Among these, a flat lower lumbar support plate member 12 constituting the lower support portion 11 is provided on the back side of the backrest surface 8 of the lumbar support mechanism 10.

  As shown in FIG. 3, the lower lumbar support plate member 12 is formed such that the backrest surface 8 side is curved in a convex shape.

  Further, on the back surface side 11d of the lower lumbar support plate member 12, a bar shaft-shaped rotating shaft member 11b is provided at a position lower than the upper and lower center portions via brackets 11c and 11c, an adhesive, and the like. It is fixed.

  As shown in FIG. 1, the rotating shaft member 11b is supported so that both end portions thereof are rotatable with respect to the back side frame members 6b and 6b, respectively. The lower lumbar support plate member 12 is pivotally supported between the back side frame members 6b and 6b so as to be swingable.

Further, on the back surface side 11d of the lower lumbar support plate member 12, the lower interlocking mechanism as shown in FIG. 2 is located above the position where the bracket 11c is fixed and in the vicinity of the upper and lower central portions. A round rod-shaped rod member 14 constituting 13 is provided.
This rod member 14 has a longitudinal direction in the left-right width direction of the chair 1, and both end portions 14 a, 14 a protrude from the left and right sides of the lower lumbar support plate member 12 with a certain size, respectively. The back side frame members 6b and 6b are loosely fitted in semicircular groove portions 15 and 15 formed in the side surface portions so as to be slidable.

  Then, as the lower lumbar support plate member 12 rotates about the rotation shaft member 11b, both end portions 14a and 14a smoothly slide in the groove portions 15 and 15 in the front-rear direction. By moving, the lower lumbar support plate member 12 can be smoothly rotated.

  Furthermore, one end portions of a pair of left and right lower cable members 16 and 16 are connected to the both end portions 14a and 14a, respectively.

  These lower cable members 16 and 16 extend downward in the extending direction from the outer side surfaces of the back side frame members 6b and 6b via guide pins 17 and 17 projecting outward from both sides. Fixing pins that are guided so as to face each other and are fixed to both outer side surfaces in the vicinity of the rear end portions of the mounting wall surface portions 2d and 2d of the cushion frame members 2a and 2a located on the left and right sides, respectively. 18 and 18.

  Among these, the guide pins 17, 17 are provided above and below the rod member 14, respectively, close to the backrest surface 8 on the seated person HU side, and both end portions of the rod member 14. The lower cable members 16, 16 are pulled in the direction of the backrest surface 8 so that 14 a, 14 a slides smoothly within the groove portions 15, 15.

  The fixing pins 18 and 18 are fixed in the vicinity of the rear end portions of the mounting wall surface portions 2d and 2d, respectively, and are offset to the rear with respect to the rotating shaft portions 4 and 4 by a certain size. As a result, the distance L1 to the guide pins 17 and 17 shown in FIG. 3 is changed to the distance L2 shown in FIG. 4 and the distance L3 shown in FIG. The structure is shortened.

  For this reason, in the lower interlocking mechanism 13, the backrest surface 8 of the seat back 5 of the chair 1 is interlocked with a reclining operation in which it moves between at least two positions, that is, a reclining position that tilts backward from the normal seating position. The lower lumbar support plate member 12 is tilted backward with the rotation shaft member 11b as the rotation center.

  That is, in this embodiment, at least in the normal sitting position shown in FIG. 3, the lumbar vertebra HB on the lower body of the seated person HU is directed forward by the lower lumbar support plate member 12 of the lower support portion 11. It is pressed.

  Further, the lower lumbar support plate member 12 is moved in conjunction with the reclining operation in which the seat back 5 tilts backward from the normal seating position to the reclining position shown in FIG. 5 through the intermediate seating position shown in FIG. Moving.

Then, the upper edge side 12b of the lower lumbar support plate member 12 is rotated in a direction away from the front backrest surface 8, and the lower edge side 12c is rotated in a direction close to the backrest surface 8, so that the seating is performed. As shown in FIG. 7, the lumbar vertebra HB at the lower body of the person HU moves from a substantially S-shaped side view as shown in FIG. 7 so as to approach a relaxed state that is substantially linear as shown in FIG. It is configured to be possible.
Further, in this embodiment, the lower lumbar support plate member 12 of the lower support portion 11 rotates about the rotation shaft member 11b as a rotation center at a position lower than the upper and lower center portions. As shown by the arrow in FIG. 6, the position where the seat back 5 supports the seated person HU from the seated person's lumbar vertebrae as shown by the arrow in FIG. It is configured to move toward the pelvis.

  In this embodiment, the seat back 5 has a first tilt angle α1 (in the normal seating position as shown in FIG. 6A with respect to the dimension h from the lower end 5a to the upper end 5b. At a back angle of about 21 °, the front curved surface of the lower lumbar support plate member 12 on the back side of the sheet display material 5c of the backrest surface 8 has a dimension from the lower end 5a of about h1 = 2 / 5h (h Are set so as to be closest to each other as the vicinity of the total length dimension from the lower end 5a to the upper end 5b of the seat back 5.

  For this reason, the portion to be supported in a concentrated manner is located in the vicinity of the concave portion of the lumbar spine HB that is curved forward in a substantially S shape, and from the back side of the backrest surface 8 by the upper edge side 12b of the lower lumbar support plate member 12. By being pressed, the shape of the lumbar vertebra HB that is efficiently curved in a substantially S shape is maintained.

  Further, as shown in FIG. 6C, at the reclining seating position at the third tilt angle α3 (around 29 ° back angle), the lower lumbar support is provided on the back surface side of the seat display material 5c of the backrest surface 8. The front-side curved surface of the plate member 12 is set so as to be closest to the lower end portion 5a in the vicinity of about h3 = 1 / 5h.

  For this reason, the part which supports intensively is located in the vicinity of the lower end convex part of the substantially S-shaped lumbar vertebra HB which curves forward, and from the back side of the backrest surface 8 to the lower edge side of the lower lumbar support plate member 12 By effectively pressing the portion near 12c, the radius of curvature of the front curve shape of the lumbar vertebra HB is gradually increased to be linear in a stepwise manner.

  Then, at an intermediate seating position such as about 25 ° (back angle of about 21 ° to 29 °), which is the second tilt angle α2 shown in FIG. 6B, from the lower end portion 5a, about h2 = 2 / 5˜ Within the range of 1 / 5h, the support surface is continually moved steplessly so that the front curved surface of the lower lumbar support plate member 12 is closest.

In this embodiment, for the sake of explanation, as shown in FIG. 6, the first tilt angle α1, the second tilt angle α2, and the third tilt angle α3 of these seat backs 5 are the upper body of the seated person HU. The first tilt angle α4, the second tilt angle α5, and the third tilt angle α6 are substantially the same angle.
Further, on the backrest surface 8 of the seat back 5 of the chair 1 of this embodiment, as one of the lumbar support mechanisms 10 above the lower support portion 11 and below the mounting position of the headrest member 7. The upper support part 21 is provided.

The upper support portion 21 is provided with an upper lumbar support plate member 22 having a flat plate shape and positioned along the back surface side of the sheet skin material 5c above the backrest surface 8.
As shown in FIG. 2, the upper lumbar support plate member 22 is formed so that the backrest surface 8 side is curved so as to be concave.

  Further, on the back surface side 21d of the upper lumbar support plate member 22, a bar shaft-shaped rotating shaft member 21b is fixed to the vicinity of the lower edge side 22b via brackets 21c and 21c, an adhesive, and the like.

  The rotating shaft member 21b is supported so that both end portions thereof are rotatable with respect to the vicinity of the upper end portions of the back side frame members 6b and 6b, respectively, whereby the back side frame in the seat back 5 is supported. The upper edge side 22c of the upper lumbar support plate member 22 located between the members 6b and 6b is pivotally supported so as to be able to swing in the front-rear direction close to and away from the backrest surface 8.

  Further, in this embodiment, from the normal seating position toward the reclining position, the seat back 5 is interlocked with the operation of tilting backward, so that the support position moves from the rear to the front, There is provided an upper interlocking mechanism 23 that swings and moves the upper edge side 22c of the upper lumbar support plate member 22 in the direction of the back surface of the sheet skin material 5c above the backrest surface 8.

  The upper interlocking mechanism 23 is configured independently of the lower interlocking mechanism 13, and is different from the lower interlocking mechanism 13 as the reclining mechanism rotates from the normal seating position to the reclining position. Separately, the upper lumbar support plate member 22 is configured to swing and move in conjunction with each other.

That is, in the upper interlocking mechanism 23, as shown in FIGS. 1 and 2, a position where the brackets 21c and 21c are fixed on the back side 21d of the upper lumbar support plate member 22 as shown in FIGS. It is fixed and provided above.
The rod member 24 has a round bar shape having a longitudinal direction in the left-right width direction of the chair 1, and both end portions 24 a, 24 a are protruded from the both sides in the left-right direction of the upper lumbar support plate member 22. It is provided so as to be freely slidable in semicircular arc-shaped groove portions 25, 25 each opened in the vicinity of the upper end of the side surface portion of the backside frame member 6b, 6b.

  Then, the both end portions 24a, 24a slide in the groove portions 25, 25, so that the rotation of the upper lumbar support plate member 22 around the rotation shaft member 21b is performed. The upper edge side 22c of the upper lumbar support plate member 22 is configured to smoothly swing in the front-rear direction.

  Furthermore, one end portions of a pair of left and right upper cable members 26, 26 are connected to the both end portions 24a, 24a, respectively.

  These upper cable members 26, 26 are connected to the rotary shaft portion 4 via guide pins 27, 27 projecting from the outer side surfaces of the back side frame members 6 b, 6 b toward the outer sides. The extending direction is guided so as to face downward, which is the four directions, and the other end portions are extended in the direction outside the mounting wall surface portions 2d and 2d of the cushion frame members 2a and 2a. .

  Of these, as shown in FIG. 3, the guide pins 27, 27 are close to the seat skin material 5c on the backrest surface 8 on the seated person HU side, respectively above and below the rod member 24. Is provided.

  The fixing pins 28, 28 are fixedly provided in the vicinity of the front edge portions of the outer side surfaces of the mounting wall surface portions 2d, 2d. Each other end is configured to be connected.

  Then, the fixed pins 28, 28 are offset to the front by a predetermined size and offset with respect to the pivot shafts 4, 4, so that the guide pins can be moved backwardly with respect to the seat back 5. The distance to 27, 27 is configured to be extended.

  For this reason, in the upper interlocking mechanism 23, the seat back 5 is tilted rearward from the normal seating position shown in FIGS. 3 to 5 to the reclining position through the intermediate seating position. The upper lumbar support plate member 22 pivots about the pivot shaft member 21b, and swings and moves so that the upper edge side 22c is close to the seat skin 5c direction of the backrest surface 8.

  By swinging movement of the upper edge side 22b, the chest HA back side of the upper body of the seated person HU shown in FIGS. 7 and 8 is pressed through the seat skin material 5c, and the headrest member 7 of the chair 1 is pressed. The upper part of the upper body of the seated person HU is raised in the direction in which the head HE is separated.

Then, as shown in FIG. 8, in the reclining position, the upper lumbar support plate member 22 supports the chest HA on the upper body from the back side so that the lumbar vertebra HB approaches a straight relaxed state. It is configured to be.
Further, in this embodiment, as shown in FIGS. 1 and 2, the upper edge side 12b of the lower lumbar support plate member 12 and the lower edge side 22b of the upper lumbar support plate member 22 are arranged close to each other.

  4 and 5, the lower rim side 22b is moved away from the backrest surface 8 by the rotation of the upper lumbar support plate member 22 around the rotation shaft member 21b. Moving.

  Accordingly, when the seat back 5 is moved to tilt backward, along with the rotational movement of the upper edge side 12b of the lower lumbar support plate member 12 interlocked by the lower interlock mechanism 13 to the rear, The smooth movement of the spine HS that is intended to be linear for the seated person HU is not hindered by retreating simultaneously in the direction in which the lower edge side 22b is separated, and further, the uncomfortable feeling is reduced. ing.

  Next, the function and effect of the chair 1 to which the lumbar support of this embodiment is applied will be described.

  In the chair 1 of this embodiment, in the normal seating position shown in FIG. 6 (a), the lower support portion 11 provided on the seat back 5 has the seat as shown by the white arrow in FIG. The lumbar vertebra HB at the lower body of the seated person HU is pressed forward with the skin material 5c interposed.

  Therefore, as shown in FIG. 7, the lumbar spine HB of the seated person HU is curved forward, and the spine HS can be held in a substantially S shape in a side view. Human fatigue can be reduced.

  Further, when the seat back 5 is tilted backward from the normal seating position using the reclining mechanism, the intermediate seating position shown in FIG. 4 and FIG. The backrest surface 8 is moved backward about the rotation shaft portion 4 to the reclining position shown.

  The lower lumbar support plate member 12 of the lower support portion 11 is rotatably supported with the rotation shaft member 11b as a rotation center, and the seat back 5 is rotated by the lower interlocking mechanism 13. Along with this, it is linked to move.

  That is, as shown in FIG. 3, in the normal seating position, a distance L1 is provided between the fixed pin 18 and the guide pin 17, but the fixed pins 18 and 18 of this embodiment are The mounting wall surface portions 2d and 2d are fixed in the vicinity of the rear end portions, respectively, and are offset to the rear with respect to the rotating shaft portions 4 and 4 by a certain size.

  Accordingly, as shown in FIGS. 4 and 5, when the seatback 5 is tilted backward, the guide pins 17 and 17 are positioned close to the fixed pin 18, and the fixed pin 18 and the guide pin The distances L2 and L3 between the distance 17 and the distance 17 are smaller than the distance L1.

Since the fixing pins 18 and 18 are fixed to the mounting wall surface portions 2d and 2d, they do not move as the seat back 5 rotates.
Further, the lower cable members 16 and 16 are fixed to the both end portions 14a and 14a of the rod member 14 while the both end portions of the lower cable members 16 and 16 are fixed to the lower end cable members 14a and 14a. The total length of 16, 16 does not change.

  For this reason, although the lower cable members 16 and 16 are relaxed, the weight of the seated person HU is also applied to the backrest surface 8, so that the guide pins 17 and 17 and both end portions 14a and 14a of the rod member 14 are 14a, both ends 14a, 14a of the rod member 14 are slid in the direction away from the backrest surface 8 by applying a pressing force to the lower lumbar support plate member 12 so as to eliminate this relaxation. To do.

  For this reason, the lower lumbar support plate member 12 provided with the rod member 14 is rotated with the rotation shaft member 11b as the rotation center and the upper edge side 12b directed rearward.

  Accordingly, the upper edge side 12b of the lower lumbar support plate member 12 moves away from the backrest surface 8 and presses against the lumbar vertebra HB at the lower upper body of the seated person HU as shown by the white arrow in FIG. While reducing the pressure contact force applied to the sheet skin material 5c, the sheet skin material 5c gradually tilts backward.

  Then, when the tension at which the relaxation of the lower cable members 16, 16 is eliminated is substantially balanced with the pressing force for rotating the upper edge side 12b of the lower lumbar support plate member 12, the upper edge side 12b moves forward. The forward movement of the lower edge side 12c stops simultaneously.

  In this embodiment, the upper edge side 12b to which a pressing force is applied is integrally formed on the opposite side of the lower lumbar support plate member 12 with brackets 11c and 11c pivotally supporting the rotating shaft member 11b interposed therebetween. The lower edge side 12c is rotated and moved in the direction of the backrest surface 8 around the rotation shaft member 11b as the rotation of the seat back 5 moves.

  For this reason, the lower edge side 12c presses the lower part of the lumbar vertebra HB on the lower body of the seated person HU with the seat skin material 5c interposed therebetween, and the rotational movement of the upper edge side 22c substantially The angle and shape of the backrest surface 8 can be deformed so as to be in a desired support state so as to extend from the S-shape to a substantially straight line and to approach the straight line.

  Therefore, physiologically, the load on the lumbar spine HB is reduced, and a relaxing effect can be given to the seated person HU.

  In this way, the lower lumbar support plate member 12 of the lower support portion 11 that moves at a rotation angle different from the backward tilting operation angle of the seat back 5 by the interlocking of the lower interlock mechanism 13 is the seat back. The lumbar spine HB of the seated person HU is appropriately held in accordance with the change in the sitting posture that occurs in response to the backward tilting motion of 5.

  Further, in this embodiment, from the normal seating position shown in FIG. 6A to the reclining position shown in FIG. 6C through the intermediate seating position shown in FIG. Like the first lower support position Y1, the second lower support position Y2, and the third lower support position Y3 indicated by the solid black arrows, they are supported in a concentrated manner by the lower lumbar support plate member 12 of the lower support portion 11. The part is moved from the lumbar vertebra HB of the seated person HU toward the pelvis of the hip HC toward the lower side of the backrest surface 8 in conjunction with the operation of tilting backward from the normal seating position to the reclining position.

  For this reason, as shown in FIGS. 7 and 8, the lumbar portion of the lumbar vertebra HB is further moved by moving the supporting portion from the lumbar vertebra HB of the seated person HU toward the pelvis of the buttocks HC. The vicinity of the HC is pushed forward, and the lumbar vertebra HB at the lower body of the seated person HU can be smoothly brought close to a straight line.

  Furthermore, in the lumbar support mechanism 10 of the chair 1 of this embodiment, an upper lumbar support plate member 22 is provided at a position higher than the lower support portion 11 having the lower lumbar support plate member 12 in the seat back 5. The upper support part 21 which has is provided.

  In the normal seating position shown in FIG. 3 and FIG. 6A, the upper lumbar support plate member 22 is located above the backrest surface 8 with respect to the back side of the chest HA as the upper body of the seated person HU. It is comprised so that it may support in the position pressed from the back surface side of the sheet | seat skin material 5c which is located.

  Further, the seat back 5 is tilted rearward from the normal seating position to the reclining position shown in FIG. 5 and FIG. 6 (c) through the intermediate seating position shown in FIG. 4 and FIG. 6 (b). However, it is moved by turning about the turning shaft 4 as a turning center.

  In conjunction with this rotational movement, the upper edge side 22c of the upper lumbar support plate member 22 is in the direction of approaching the rear surface side of the seat skin material 5c located above the backrest surface 8 from the rear to the front. The swinging shaft member 21b is pivotally moved around the center of rotation.

  That is, when the upper edge side 22c of the upper lumbar support plate member 22 is swung in the front-rear direction close to the backrest surface 8 in conjunction with the reclining operation in which the seat back 5 tilts backward to the reclining position, The upper edge side 22c of the upper lumbar support plate member 22 is moved close to the seat skin material 5c of the backrest surface 8 with the rotation shaft member 21b as the rotation center.

  Therefore, as shown in FIG. 8, the back side of the chest HA, which is the upper body of the seated person HU, is pressed via the seat skin material 5c by the swing of the upper lumbar support plate member 22, Even when the upper body is lying on the reclining position, it is supported by the surface near the upper edge side 22c of the upper lumbar support plate member 22 in the direction in which the head HE is separated from the headrest member 7 of the chair 1. The

  For this reason, the lumbar vertebra HB of the seated person HU is further held so as to approach the straight relaxed state.

  Further, in this embodiment, as shown in FIGS. 1 and 2, the upper edge side 12b of the lower lumbar support plate member 12 and the lower edge side 22b of the upper lumbar support plate member 22 are arranged close to each other.

  Therefore, the face plate-like lower lumbar support plate member 12 and upper lumbar support plate member 22 are substantially continuous in the upward and downward directions to support the occupant HU as if it were a single lumbar support plate. Therefore, there is little discomfort such as recognizing a step.

  The lower lumbar support plate member 12 and the upper lumbar support plate member 22 have a convex shape and a concave shape, and are alternately curved.

  For this reason, the proximity portion of the upper edge side 12b of the lower lumbar support plate member 12 and the lower edge side 22b of the upper lumbar support plate member 22 has a substantially S-shape that is smoothly connected. The level difference between the lumbar support plate member 12 and the upper lumbar support plate member 22 can reduce the possibility of being recognized by the seated person HU, thereby reducing the sense of incongruity.

  Moreover, as shown in FIGS. 4 and 5, the lower edge side 22 b is separated from the backrest surface 8 in the direction away from the backrest surface 8 by the rotation of the upper lumbar support plate member 22 around the rotation shaft member 21 b. Move backwards somewhere.

  Therefore, the seat back 5 is moved backward to the rear side of the upper edge side 12b of the lower lumbar support plate member 12 interlocked by the lower interlocking mechanism 13 when the reclining mechanism is pivoted to tilt backward. A smooth movement of the seated person HU's spine HS to become substantially straight along with the rotational movement is not hindered by the lower edge side 22b, and the uncomfortable feeling can be further reduced.

  Further, in the lumbar support of the chair 1 of this embodiment, the lower lumbar support plate member 12 provided on the backrest surface 8 of the seat back 5 is the lumbar spine HS of the seated person HU in the normal seating position. In the upper part of the HB, the vicinity of the chest HA at the upper part of the upper body is a first lower support position Y1 indicated by a black arrow in FIG. 6A (from the lower end 5a with respect to the vertical dimension h of the seat back 5, (2 / 5h height position) and is supported intensively.

  Further, at the reclining position, below the first lower support position Y1, a third lower support position Y3 indicated by a black arrow in FIG. 6C (with respect to the longitudinal dimension h of the seat back 5). The back side of the lumbar vertebra HB is opposed and concentratedly supported at a height position of about 1 / 5h from the lower end 5a.

For this reason, since the backrest surface 8 performs a desired deformation in response to a change in the sitting posture of the seated person HU caused by the backward tilt of the seat back 5, the accurate position of the spine HS of the seated person HU is determined. It can be supported at an appropriate angle.
Moreover, in this embodiment, the seat back 5 moves between the first lower support position Y1 and the third lower support position Y3 while the seat back 5 moves from the normal seating position to the reclining position. 5 of the spine HS of the seated person HU in response to a change in the tilt angle α2 (α1 to α3) of 5, any one of the first lower support position Y1 near the chest HA and the third lower support position Y3 The second lower support position Y2 indicated by the black arrow in FIG. 6B is moved in the vertical direction so that the portion is supported in a concentrated manner.

  In this embodiment, from the first lower support position Y1 to the third lower support position Y3, the reclining operation (tilt angle α2 (α1 to α3)) of the seatback 5 is performed in the vertical direction of the seatback 5. 2), the second lower support position Y2 continuously moves in the height direction dimension h2 = 2 / 5h to 1 / 5h.

  For this reason, it is possible to cope with a minute tilt of the seat back 5 backward, and in response to the change in the sitting posture of the seated person HU caused by the change in the angle of the backrest surface 8, an appropriate position can be set at an appropriate angle. Can support.

  In this embodiment, the upper interlocking mechanism 23 is configured independently of the lower interlocking mechanism 13, and the rotational movement from the normal seating position to the reclining position by the reclining mechanism is performed. Separately from the lower interlocking mechanism 13, the upper lumbar support plate member 22 is oscillated and moved in conjunction with the reclining operation, so that the upper edge side 22 c becomes the seat skin material 5 c of the backrest surface 8. It moves so that it may approach in the direction.

  Due to the swing movement of the upper edge side 22c, the chest HA back side of the upper body of the seated person HU is pressed via the seat skin material 5c, and the head HE is moved from the headrest member 7 of the chair 1 to the upper side. The upper part of the upper body of the seated person HU is raised in the direction of separation as shown in FIG. 5 through the intermediate seating position shown in FIG.

  For this reason, the lumbar vertebra HB in the upper lower part of the seated person HU is further extended from a substantially S shape shown in FIG. 7 to a substantially straight shape as shown in FIG. It can be easily supported.

  In this way, not only directly extending the lower lumbar vertebra HB, but also raising the back side of the upper thoracic HA and using the entire spine HS, the lumbar vertebra HB approaches a substantially straight line. Thus, the angle and shape of the backrest surface 8 can be changed by the upper support portion 21.

  Therefore, physiologically, the load on the lumbar spine HB is further reduced, and a relaxing effect can be given to the seated person HU.

  The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are not limited to this embodiment. Included in the invention.

  That is, in the said embodiment, the chair 1 which combined the upper support part 21 which provided the upper lumbar support plate member 22 in the lower lumbar support plate member 12 which comprises the lower support part 11 as the lumbar support mechanism 10 is illustrated. However, the present invention is not limited to this.

  For example, the lower lumbar support plate member 12 constituting the lower support portion 11 is moved by the lower interlocking mechanism 13 in conjunction with the operation of tilting the seat back 5 backward, so that the lower lumbar vertebra HB on the lower body of the seated person HU is Any device that moves so as to approach a straight line may be used.

  Further, for example, the lower lumbar support plate member 12 having any shape may be used. The lumbar support mechanism 10 is a combination of any shape, quantity and material, such as an intermediate support member made of an intermediate plate member provided between the upper support member 21 and supported by three plate members. Also good.

  Furthermore, in this embodiment, the lower lumbar support plate member 12 that constitutes the lower support portion 11 and the upper lumbar support plate member 22 that constitutes the upper support portion 21 are more than the seat skin material 5 c of the seat back 5. Although it has been described by using the separated inside, for example, the lower lumbar support plate member 12 or the upper lumbar support is not limited to this. You may comprise so that a part of plate member 22 may protrude in the seated person HU direction and may be pressed.

Further, a part or all of the lower lumbar support plate member 12 or the upper lumbar support plate member 22 may be used to substitute a part of the seat skin material 5c, or may be used as a general surface or the backrest surface 8. May be.
Furthermore, in this embodiment, the reclining operation of the seat back 5 that continuously operates from the first lower support position Y1 to the third lower support position Y3 (between the tilt angles α2 (α1 to α3)). ), The lower lumbar support plate member 12 of the lower support part 11 and the upper support part 21 are in the range of the height direction dimension h2 = 2 / 5h to 1 / 5h. The upper lumbar support plate member 22 is configured to continuously rotate or swing. However, the present invention is not limited to this, for example, at least between the normal seating position and the reclining position. If the lumbar vertebra at the lower part of the upper part of the seated person is moved in a straight line in conjunction with the movement of the seat back tilting backward, A plurality of second lower support positions Y2 may be provided to correspond to those that stop the reclining operation in stages. The stop angle of the lower lumbar support plate member 12 and the upper lumbar support plate member 22, the pressing position, and The variable amount is not limited.

  In the above-described embodiment, the chair to which the lumbar support is applied has been described. However, the present invention is not limited to this. For example, for home use, for offices, factories or laboratories, indoor use, outdoor use, vehicles The chair may be used for any purpose such as for aircraft, for aircraft, and for ships, and may be used for a so-called general chair.

DESCRIPTION OF SYMBOLS 1 Chair 5 Seat back 6c, 6c Each lower end part 8 Backrest surface 10 Lumbar support mechanism 11 Lower support part 12 Lower lumbar support plate member 12b Upper edge side 13 Lower interlocking mechanism 21 Upper support part 22 Upper lumbar support plate member 22b Lower edge side 23 Upper part Interlocking mechanism α1, α2, α3 1st, 2nd, 3rd tilt angle HB Lumbar spine HS Spine HU Seated person (sitting person)
Y1, Y2, Y3 1st, 2nd, 3rd lower support position

Claims (6)

A seat back having a backrest surface is moved between at least two positions, a normal seating position and a reclining position tilting backward from the normal seating position, so that the lumbar vertebrae below the upper body of the person sitting on the seat back A lumbar support provided with a lower support portion that presses the front side forward,
A lower lumbar support plate member forming the lower support portion on the back side of the backrest surface, the backrest surface side being formed in a convex shape;
A rotating shaft member that rotatably supports the lower lumbar support plate member;
A lower interlocking mechanism that tilts the lower lumbar support plate member rearward with the rotating shaft member as a rotation center in conjunction with a reclining operation in which the backrest surface of the seat back moves between at least the two positions. Have
When the seat back is in the normal seating position, the upper rim side of the lower lumbar support plate member is pressed from the back side of the backrest surface, thereby bending the lumbar vertebrae forward,
When the seat back is tilted to the reclined position from the normal seating position, said lower interlocking mechanism linked to said reclining movement, together with the upper edge is rotated in a direction away from said back surface, the lower lumbar lower edge of the support plate member is rotated in a direction close to the backrest surface, that close the lumbar that is curved forward in a straight line
Lumbar support, wherein a call.   The lower support portion moves in a pelvic direction from the seated person's lumbar spine in conjunction with an operation of tilting backward from the normal seating position to the reclining position. The lumbar support according to claim 1.   An upper support portion is provided above the lower support portion on the backrest surface of the seat back so as to support the upper body of a seated person. In the upper support portion, the reclining position is changed from the normal seating position. The lumbar support according to claim 1, wherein the support position is moved from the rear to the front in conjunction with an operation of tilting backward toward the rear.   In the normal seating position, the lower support portion of the seat back intensively supports the first lower support position in the vicinity of the upper body of the seated person's spine, and in the reclining position, the first support position. The lumbar support according to any one of claims 1 to 3, wherein the third lower support position located below the lower support position is intensively supported.   A person who sits between the first lower support position and the third lower support position according to the tilt angle of the seat back while the seat back moves from the normal seating position to the reclining position. A second lower support position that intensively supports any part from the first lower support position in the vicinity of the upper body of the spine to the third lower support position. The lumbar support according to claim 4. On the backrest surface of the seat back, an upper support portion is provided above the lower support portion,
6. The upper edge side of the lower lumbar support plate member constituting the lower support portion and the lower edge side of the upper lumbar support plate member constituting the upper support portion are arranged close to each other. The lumbar support according to any one of the above.

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