JP2013085833A - Lumbar support device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lumbar support device that can have a good push-out feeling.SOLUTION: The lumbar support device has: a seat back frame 1 for supporting the back part of a seater; a warp plate 23 supported by the seat back frame 1 to enable the back part of the seater to deform in the pressing direction; and a drive portion 9 deforming the warp plate 23 in the pressing direction of the back part of the seater. The bending rigidity of a pressing portion 71 for pressing the back part of the seater on the warp plate 23 is higher than the bending rigidity of the periphery of the pressing portion 71.

Description

  The present invention relates to a lumbar support device that presses the back of a seated person and supports the correct posture of the seated person.

  The lumbar support device includes a warp plate that is supported by a seat back frame that supports the back of the seated occupant and is deformable in a direction of pressing the back of the seat occupant, and a drive unit that deforms the warp plate.

  And if a drive part is driven, a curvature plate will curve in circular arc shape so that a seated person's back part may be pressed (for example, refer patent document 1).

Special table 2006-523105

  However, the warp plate of the conventional lumbar support device has a problem that the pressing area is narrow and the feeling of extrusion becomes partial.

  This invention is made | formed in view of the said problem, The subject is providing the lumbar support apparatus from which a favorable extrusion feeling is obtained.

  According to a first aspect of the present invention, there is provided a seat back frame for supporting a seated occupant's back, a warp plate supported by the seat back frame and deformable in a direction of pressing the seat occupant's back, and the warp plate being deformed. A lumbar support device, wherein the bending rigidity of the pressing portion that presses the back of the seat seater of the warping plate is higher than the bending rigidity around the pressing portion.

  The invention according to claim 2 is the lumbar support device according to claim 1, wherein the pressing portion is provided with a rib extending in a driving direction of the driving portion.

  In the present specification, the “seat back frame” includes the seat back frame itself and a member that supports the back of the seated person together with the seat back frame.

  According to the invention which concerns on Claim 1-Claim 2, when the bending rigidity of the press part which presses the back part of the said seat seated person of the said curvature plate is higher than the bending rigidity of the periphery of the said press part, The amount of bending deformation is reduced and the pressing area is increased. Therefore, a good extrusion feeling can be obtained.

It is a figure explaining the seat back provided with the lumbar support device of an embodiment. FIG. 2 is an exploded perspective view of FIG. 1. FIG. 3 is a view in the direction of arrow III of the drive unit in FIG. 1. It is a perspective view in the state where the curvature plate of the lumbar support device of this embodiment has hardly changed in the direction which presses a seat seated person's back. It is a V direction arrow directional view of FIG. FIG. 6 is a view in the direction of the arrow VI in FIG. 4. It is a perspective view in the state where the curvature plate of the lumbar support device of this embodiment changed in the direction which presses a seat seated person's back. It is a VIII direction arrow line view of FIG. It is an IX direction arrow line view of FIG. It is a figure explaining another form. It is a figure explaining another form.

  First, a seat back of a seat provided with the lumbar support device of the present embodiment will be described with reference to FIGS. 1 is a view for explaining a seat back provided with the lumbar support device of the embodiment, FIG. 2 is an exploded perspective view of FIG. 1, and FIG. 3 is a view in the direction of arrow III of the drive unit of FIG.

  1 to 3, the arrow F direction indicates the front side direction of the seat back (the side direction facing the back of the seat back seated person), and the arrow B direction indicates the back side direction of the seat back.

  1 and 2, first, the seat back frame 1 that supports the back of the seated person will be described. The seat back frame 1 of the present embodiment has a pair of right frame 1a and left frame 1b. An upper frame 1c is provided above the right frame 1a and the left frame 1b so as to bridge the both. The upper frame 1c includes a base portion 1d extending in the horizontal direction, a first vertical portion 1e bent from one end portion of the base portion 1d and connected to the upper portion of the right frame 1a, and the other end portion of the base portion 1d. And a second vertical portion 1f that is bent from the top and connected to the upper portion of the left frame 1b. A sub-upper frame 1g is provided so as to bridge an intermediate portion of the first vertical portion 1e and an intermediate portion of the second vertical portion 1f of the upper frame 1c. A lower frame 1h is provided at the lower part of the right frame 1a and the left frame 1b so as to bridge the both.

  A spring material is bent on the front side of the seat back of the sub-upper frame 1g and the lower frame 1h of the seat frame 1, and a substantially U-shaped big wire (sub-frame: seated with the seat back frame together with the seat back frame) is supported. 7) is disposed. The big wire 7 of the present embodiment is narrower than a pair of upper and lower upper extension portions 7a and 7b extending in the up and down direction and the upper and lower upper extension portions 7a and 7b. Lower upper and lower direction extending portions 7c and 7d are provided. The upper vertical extending portions 7a and 7b are arranged so as to be line-symmetric with each other around a position corresponding to the seated person's spine. Further, the lower vertical extending portions 7c and 7d are also arranged so as to be line-symmetric with respect to each other around a position corresponding to the seated person's spine. The lower ends of the upper vertical extending portions 7a and 7b and the upper ends of the lower vertical extending portions 7c and 7d are connected by inclined portions 7e and 7f. The lower end portion of the lower vertical extending portion 7c and the lower end portion of the lower vertical extending portion 7d are connected by a bridging portion 7g. The lower vertical extending portions 7c and 7d are curved along the back surface of the seated person. Further, stepped portions 7h and 7i are formed below the lower vertical extending portions 7c and 7d via inclined portions (stepped portions) 7j and 7k, which are positioned in the back surface direction of the seat back.

  That is, a recessed portion is formed in the lower side of the big wire 7 on the back side of the seat back.

  The upper vertical extending portion 7a of the big wire 7 is inserted through a cylindrical clip 3 attached to the front side of the seat back of the sub-upper frame 1g. Further, the upper vertical extending portion 7b of the big wire 7 is inserted through a cylindrical clip 5 attached to the sub-upper frame 1g. Therefore, the big wire 7 is attached to the seat back frame 1 so as to be slidable in the vertical direction.

  A base plate 11 provided with a drive unit 9 is attached to the back side of the seat back below the big wire 7. The details of the drive unit 9 will be described later.

  The bridging portion 7 g of the big wire 7 is connected to the lower frame 1 h of the seat back frame 1 through the fish mouth spring 13.

  The fish mouth spring 13 has base portions 13a and 13b attached to the lower frame 1h by two cut and raised locking pieces 15 and 17 formed on the lower frame 1h of the seat back frame 1. The interval between the cut-and-raised pieces 15 and 17 is set wider than the interval between the lower vertical extending portions 7 c and 7 d of the big wire 7. The fish mouth spring 13 includes rising portions 13c and 13d extending upward from the ends on the right frame 1a and left frame 1b sides of the seat back frame 1 of the base portions 13a and 13b, and tip portions of the rising portions 13c and 13d. The base wire facing portions 13e and 13f extending toward the lower vertical extending portions 7c and 7d of the big wire 7 and the distal ends of the base facing portions 13e and 13f Torsion arm portions 13g, 13h extending toward the bridging portion 7g, and attachment portions 13i that bridge the tip portions of the torsion arm portions 13g, 13h and extend along the bridging portion 7g of the big wire 7. doing. Furthermore, in the central portion of the attachment portion 13i, there are formed arm portions 13k and 13l that intersect with the extending direction of the attachment portion 13i, and a step portion 13j that bridges the tip portions of the arm portions 13k and 13l.

  That is, the fish mouth spring 13 has a base portion 13a, 13b, a rising portion 13c, 13d, and a base facing portion 13e, 13f, a first base end portion and a second base end to which the torsion arm portions 13g, 13h are fixed. The attachment portion 13i corresponds to the tip of the torsion arm portions 13g and 13h.

  The arm portions 13k and 13l and the step portion 13j form an engaging portion.

  The bridging portion 7 g of the big wire 7 and the attachment portion 13 i of the fish mouth spring 13 are fixed by caulking tools 19 and 21.

  On the front side of the seat back of the lower vertical extending portions 7c and 7d of the big wire 7, a substantially plate-shaped warping plate 23 made of resin is disposed. The warp plate 23 is broadly divided into a main body portion 23a and a first upper mounting that is connected to the upper portion of the main body portion 23a and extends from the upper portion of the lower vertical extending portion 7c of the big wire 7 to the lower portion of the inclined portion 7e. The portion 23b and a second upper mounting portion 23c extending from the upper portion of the lower vertical extending portion 7d of the big wire 7 to the lower portion of the inclined portion 7f. Notched grooves 25 and 27 and a hole 29 are formed between the main body portion 23a, the first upper mounting portion 23b, and the second upper mounting portion 23c, and when a vertical load is applied to the warping plate 23. In addition, it is a fragile part with lower bending rigidity than other parts.

  The first upper mounting portion 23b includes an upper mounting portion 31 that elastically deforms and sandwiches the inclined portion 7e of the big wire 7, and a lower mounting portion 33 that elastically deforms and sandwiches the lower vertical extending portion 7c of the big wire 7. Is formed. The second upper mounting portion 23c includes an upper mounting portion 35 that elastically deforms and sandwiches the inclined portion 7f of the big wire 7, and a lower mounting portion 37 that elastically deforms and sandwiches the lower vertical extending portion 7d of the big wire 7. Is formed.

  By attaching the upper attachment portion 31 and the upper attachment portion 35 of the warp plate 23 to the inclined portion 7e and the inclined portion 7f of the big wire 7, the upper portion of the warp plate 23 is fixed to the big wire 7 so that the upper and lower portions are raised and lowered. prohibited.

  An inner rib 39 and an outer rib 41 are formed between the upper mounting portion 31 of the first upper mounting portion 23 b and the lower mounting portion 33 so as to sandwich the lower vertical extending portion 7 c of the big wire 7. An inner rib 43 and an outer rib 45 are formed between the upper mounting portion 35 of the second upper mounting portion 23 c and the lower mounting portion 37 so as to sandwich the lower vertical extending portion 7 d of the big wire 7.

  Here, the drive unit 9 will be described. Mounting portions 47 and 49 that are bent and extend in the direction of the back side of the seat back are formed on the side of the base plate 11 (see FIG. 2).

  The base plate 11 is disposed in a recessed portion formed by the inclined portions 7j, 7k and step portions 7h, 7i below the lower vertical extending portions 7c, 7d of the big wire 7, and the upper end surface of the base plate 11 is The sloping portion 7j and the sloping portion 7k can be brought into contact with each other. The mounting portions 47 and 49 of the base plate 11 are bent so as to wind the step portions 7h and 7i of the lower vertical extending portions 7c and 7d of the big wire 7, so that the step portions 7h and 7i of the big wire 7 are bent. It is attached.

  In the central portion of the base plate 11 on the back side of the seat back, a first standing wall portion 51 extending in the vertical direction, a second standing wall portion 53 parallel to the first standing wall portion 51, and the first standing wall portion 51 and the second standing wall. A bridging portion 56 that bridges the portion 53 is formed. A first guide hole 51a extending in the vertical direction is formed in the first standing wall portion 51, and a second guide hole 53a extending in the vertical direction also in the second standing wall portion 53 and facing the first guide hole 51a. Is formed.

  On the lower end surface of the first standing wall portion 51 and the lower end surface of the second standing wall portion 53, cutout portions (contact portions) 51 d and 53 d that can contact the bridging portion 7 g of the big wire 7 are formed.

  Therefore, the base plate 11 is bent so that the mounting portions 47 and 49 wind the stepped portions 7h and 7i of the lower vertical extending portions 7c and 7d of the big wire 7 to the front side and the back side of the seat back. Movement and the lateral movement of the seat back are prohibited. Furthermore, the upper end surface of the base plate 11 can contact the inclined portion 7j and the inclined portion 7k, and the lower end surface of the first standing wall portion 51 and the lower end surface of the second standing wall portion 53 are bridge portions 7g of the big wire 7. The base plate 11 is also prohibited from moving along the stepped portions 7h and 7i of the big wire 7, and the base plate 11 is positioned.

  The upper part of the first standing wall portion 51 is bent in the right frame 1a direction of the seat back frame 1 to form a first gear box mounting portion 51b. The upper portion of the second standing wall portion 53 is bent in the direction of the left frame 1b of the seat back frame 1 to form a second gear box mounting portion 53b.

  The front side of the seat back in the base plate 11 is an abutting portion 48 that allows the lower end of the warping plate 23 to come into contact with a line when the warping plate 23 is deformed in a direction to press the back of the seated person.

  A gear box 59 is attached to the first gear box attachment portion 51b and the second gear box attachment portion 53b using fastening screws 55 and 57. A motor 61 is integrally attached to the gear box 59. In the gear box 59, a nut member having a hole having an internal thread formed on the inner surface is rotatably provided. The nut member is rotated by a motor 61.

  A screw rod 63 having a screw formed on the outer surface is disposed in a space between the first standing wall portion 51 and the second standing wall portion 53 and is screwed into a nut member in the gear box 57. Further, in the lower part of the main body portion 23 a of the warp plate 23, there is a space between the first mounting portion 23 d that fits in the space between the first standing wall portion 51 and the screw rod 63, and the space between the second standing wall portion 53 and the screw rod 63. A second mounting portion 23e to be fitted is formed. A through hole 63 a is formed in the lower portion of the screw rod 63.

  And the 2nd guide hole 53a of the 2nd standing wall part 53, the hole of the 2nd attachment part 23e of the curvature plate 23, the hole 63a of the screw rod 63, the hole of the 1st attachment part 23d of the curvature plate 23, the 1st standing wall part 51 The pin 65 is inserted through the first guide hole 51a. For this reason, the screw rod 63 is prohibited from rotating around the axis, and can move along the axes (the first guide hole 51a and the second guide hole 53a). When the motor 61 is driven, the nut member in the gear box 59 rotates. The screw rod 63 screwed into the nut member moves along the first guide hole 51a and the second guide hole 53a. The lower part of the warp plate 23 also moves up and down along the first guide hole 51a and the second guide hole 53a.

  Accordingly, a gear box 59 having a nut member, a motor 61 for rotationally driving the nut member in the gear box 59, a screw rod 63 screwed into the nut member in the gear box 59, and the screw rod 63 and the lower portion of the warping plate 23 are connected. The drive part 9 is comprised by the pin 65 to perform, the 2nd guide hole 53a of the 2nd standing wall part 53 in which the pin 65 penetrates, and the 1st guide hole 51a of the 1st standing wall part 51.

  Moreover, the 1st recessed part 51c and the 2nd recessed part 53c which the level | step-difference part 13j of the fish mouth spring 13 engages are formed in the lower part of the 1st standing wall part 51 and the 2nd standing wall part 53. Thereby, the rotation centering on the attachment part 13i and the base part opposing parts 13e and 13f (base end part) of the fish mouth spring 13 is prohibited.

  That is, the first concave portion 51c and the second concave portion 53c of the base plate 11 and the step portion 13j of the fish mouth spring 13 prevent rotation with the base end portions of the torsion arm portions 13g and 13h of the fish mouth spring 13 as fulcrums. A rotation prevention unit is configured.

  Further, the first concave portion 51 c and the second concave portion 53 c of the base plate 11 are engaging portions that engage with the bridging portion 7 g of the big wire 7.

  And in this embodiment, plate | board thickness is thicker than another part in the part (in this embodiment center part of the height direction of the main-body part 23a) which presses the seat seater's back part of the main-body part 23a of the curvature plate 23. FIG. A thick pressing portion 71 is formed.

  Next, the operation of the above configuration will be described with reference to FIGS. 4 is a perspective view of the lumbar support device of the present embodiment in a state in which the warp plate is hardly deformed in the direction of pressing the back of the seat occupant, FIG. 5 is a view in the direction of the arrow V in FIG. FIG. 7 is a perspective view of the warp plate of the lumbar support device of the present embodiment deformed in a direction to press the back of the seat occupant, and FIG. 8 is a direction arrow VIII of FIG. FIG. 9 is a view in the direction of the arrow IX in FIG.

  The state shown in FIGS. 4 to 6 is a state in which the screw rod 63 is positioned below and the warping plate is hardly deformed in the direction of pressing the back of the seat occupant.

  When the motor 61 is driven to rotate in one direction from this state, the nut member in the gear box 59 rotates in one direction, and the screw rod 63 rises. Since the upper part of the warp plate 23 is prohibited from rising and lowering, the warp plate 23 is formed by notch grooves 25 and 27 and a hole 29 as shown in FIGS. The seat is deformed in the direction of pressing the back of the seat occupant.

  When the motor 61 is driven to rotate in the other direction from the state shown in FIGS. 7 to 9, the nut member in the gear box 59 rotates in the other direction, the screw rod 63 descends, and the warping plate 23 The amount of deformation in the direction in which the back of the seat occupant is pressed is reduced.

  According to the above configuration, the pressing portion 71 having a thicker thickness than the other portions is formed in the center portion in the height direction of the main body portion 23a of the warp plate 23. It becomes higher than the bending rigidity. Therefore, as shown in FIG. 9, the amount of bending deformation of the pressing portion 71 is reduced, the pressing area is increased, and a good extrusion feeling is obtained.

  Further, by appropriately setting the shape of the pressing portion 71, a good extrusion feeling can be obtained.

  The present invention is not limited to the above embodiment. In the above embodiment, the pressing portion 71 is thicker than other portions, but the following configuration is also possible.

 (1) As shown in FIG. 10, on the back side of the seat back of the pressing part 171 of the warping plate 123, the driving direction D of the driving part (the direction in which a bending force acts on the warping plate 123, in this embodiment, the vertical direction) A plurality of ribs 101 extending in the direction (for example, the horizontal direction) intersecting the driving direction of the driving unit are provided, and the pressing portion 171 having higher bending rigidity than the other portions is formed. A bead may be used instead of the rib 101. One rib 101 or bead may be provided.

 (2) As shown in FIG. 11, grooves 201 and 203 extending in a direction (for example, a horizontal direction) intersecting the driving direction D of the driving unit are formed in the upper and lower portions of the pressing unit 271 of the warping plate 223, respectively. .

  The groove 201 and the groove 203 are weak parts having lower bending rigidity than other parts. Therefore, when the driving unit is driven, the groove 201 and the groove 203 are greatly bent, and the bending deformation amount of the pressing part 271 is reduced.

  In addition, this invention is not limited to the said embodiment. In the above embodiment, the drive unit 9 uses the motor 61, but it may be manually operated.

DESCRIPTION OF SYMBOLS 1 Seat back frame 9 Drive part 23 Warp plate 71 Press part

Claims (2)

A seat back frame that supports the back of the seated person,
A warp plate supported by the seat back frame and deformable in a direction of pressing the back of the seat occupant;
A drive unit for deforming the warping plate;
Have
The lumbar support device according to claim 1, wherein a bending rigidity of a pressing portion that presses the back of the seat occupant of the warping plate is higher than a bending rigidity around the pressing portion.   The lumbar support device according to claim 1, wherein the pressing portion is provided with a rib extending in a driving direction of the driving portion.

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