JP2013085832A - Lumbar support device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lumbar support device easy to mount a fish mouth spring and a sub frame for reducing members to mount the fish mouth spring and the sub frame.SOLUTION: The lumbar support device has: a seat back frame 1; a sub frame 7 one end part of which is mounted on the seat back frame 1; a fish mouth spring 13, the base end part of which is mounted on the seat back frame 1, the end part of which is connected with the other end part of the sub frame 7, and which has torsion arm portions 13g and 13h between the base end part and the tip part; a warp plate 23 supported by the sub frame 7; a base plate 11 provided on the sub frame 7; and a drive portion provided on the base plate 11 to drive the warp plate 23. The base plate 11 and the fish mouth spring 13 are provided with rotation prevention portions that prevent rotations around the fulcrums being the base end parts of the torsion arm portions 13g and 13h using one fish mouth spring 13.

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.

  For example, some vehicle seats include a seat back frame that supports the back of a seated person, and a sub frame that has one end attached to the seat back frame. This subframe is sometimes called a big wire formed by bending a spring material.

  The other end of the sub frame is attached to the seat back frame via a torsion spring called a fish mouth spring (see, for example, Patent Document 1).

JP 2011-105126 A

  However, the conventional sheet described in Patent Document 1 has the following problems.

 (1) Two fish mouth springs are required. Therefore, the mountability is poor.

 (2) For attaching each fish mouth spring and sub-frame (big wire), a first caulking tool (first attaching member) for attaching the fish mouth spring and sub-frame, and a torsion arm portion of the fish mouth spring The 2nd crimping tool (2nd attachment member) which prevents the rotation which uses the base end part of this as a fulcrum is required. That is, a total of four caulking tools are required. Therefore, the mountability is poor. Moreover, there are many attachment members (caulking tools).

  The present invention has been made in view of the above-mentioned problems, and its problem is that the attachment property between the fish mouth spring and the sub frame is simple, and the lumbar support device can reduce the number of attachment members between the fish mouth spring and the sub frame. Is to provide.

  The invention according to claim 1, which solves the above problem, includes a seat back frame that supports the back of a seated person, a sub frame that has one end attached to the seat back frame, and a base end that attaches to the seat back frame. A fish mouth spring having a torsion arm portion between the base end portion and the tip end portion, and a back portion of a seat seated person supported by the sub frame. A base plate provided on the sub-frame, and a drive unit provided on the base plate for driving the plate in a direction to press the back of the seated person, the base plate, The fish mouth spring is provided with an anti-rotation portion that prevents rotation with the base end of the torsion arm as a fulcrum. A lumbar support device according to claim.

  According to a second aspect of the present invention, the rotation preventing portion is formed at the distal end portion of the fish mouth spring, and a pair of arm portions intersecting the extending direction of the distal end portion, and the distal end portion of the arm portion is bridged. 2. The lumbar support device according to claim 1, further comprising: an engaging portion including a step portion to be formed; and a concave portion formed on the base plate and engaged with the engaging portion of the fish mouth spring.

  According to the first and second aspects of the invention, since only one fish mouth spring is required, the attachment between the fish mouth spring and the subframe is simple. Further, the number of mounting members can be reduced.

  Further, by providing the base plate and the fish mouth spring with an anti-rotation portion that prevents rotation with the base end portion of the torsion arm portion as a fulcrum, the number of attachment members can be reduced.

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.

  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. At the same time, it 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 following effects can be obtained.

 (1) Since only one fish mouth spring is required, the attachment of the fish mouth spring 13 and the big wire (subframe) 7 is simple. Further, the number of mounting members can be reduced.

 (2) 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 around the base end portions of the torsion arm portions 13g and 13h of the fish mouth spring 13. By providing the anti-rotation part, the mounting member can be reduced. This also prevents (positions) the relative rotation between the fish mouth spring 13 and the big wire 7, so that the caulking tools 19 and 21 are easily caulked.

  In addition, this invention is not limited to the said embodiment. In the above embodiment, the upper part is fixedly supported on the seat back frame 1 and the warp plate 23 that can be deformed in the direction of pressing the back of the seat occupant is used, but the upper part is supported rotatably on the seat back frame 1. A rotating plate may be used.

  Moreover, in the said embodiment, although the drive part 9 used the motor 61, it may be manual.

1 Seat back frame 7 Big wire (subframe)
9 Drive part 13 Fish mouth spring 13g, 13h Torsion arm part 13i Mounting part 23 Warpage plate

Claims (2)

A seat back frame that supports the back of the seated person,
A sub-frame having one end attached to the seat back frame;
A fish mouth spring having a base end attached to the seat back frame, a tip connected to the other end of the sub-frame, and a torsion arm between the base end and the tip;
A plate supported by the subframe and pressing the back of the seat occupant;
A base plate provided in the subframe;
A drive unit provided on the base plate for driving the plate in a direction to press the back of the seated person;
Have
A lumbar support device, wherein the base plate and the fish mouth spring are provided with a rotation preventing portion for preventing rotation with a base end portion of the torsion arm portion as a fulcrum. The rotation preventing part is
An engagement part formed of a pair of arm parts formed at the tip part of the fish mouth spring and intersecting the extending direction of the tip part, and a step part bridging the tip part of the arm part;
A recess formed in the base plate and engaged with an engaging portion of the fish mouth spring;
The lumbar support device according to claim 1, comprising:

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