WO2014073463A1

WO2014073463A1 - Lumbar support device

Info

Publication number: WO2014073463A1
Application number: PCT/JP2013/079663
Authority: WO
Inventors: 啓允鈴木; 高田　陽一
Original assignee: シロキ工業株式会社
Priority date: 2012-11-07
Filing date: 2013-11-01
Publication date: 2014-05-15
Also published as: JP2014094040A; US20150305506A1

Abstract

The present invention addresses the problem of providing a lumbar support device having a compact drive section. A lumbar support device is provided with: a seat back frame (7) which has horizontally extending horizontal sections (7j, 7k) and which is provided to a seat back for supporting the back of a seated person; a bendable plate (23) which has a hinge section (23b) provided at one end thereof, the hinge section (23b) rotatably engaging with the horizontal sections (7j, 7k); and a drive mechanism (9) which is provided to the seat back frame (7), is connected to the other end of the bendable plate (23), and causes the other end to approach and separate from the one end, thereby changing the degree of bending of the bendable plate (23).

Description

Lumber support device

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

Some vehicle seats have a lumbar support device.

An example of a lumbar support device has the following structure.

The seat back frame is provided with a pair of big wires which are formed by bending a spring material and extending in the vertical direction.

And, guides are provided on both sides of the warp plate that presses the back of the seated person. Each guide engages with the big wire, and the warp plate is movable in the vertical direction along the big wire. The warp plate can be raised and lowered to a desired position of the big wire.

Further, the drive unit changes the distance between the two vertical positions of the warp plate to change the degree of curvature of the warp plate, thereby changing the amount of pressure on the back of the seat seater (for example, Patent Document 1). reference).

Japan Special Table 2006-523105 (Fig. 2)

However, in the lumbar support device described in Patent Document 1, when the warpage plate is greatly curved, the warp plate guide and the big wire are greatly twisted. That is, there is a problem that a large force is required to bend the warping plate greatly, and the drive unit becomes large.

The present invention has been made in view of the above problems, and an object thereof is to provide a lumbar support device in which a drive unit does not increase in size.

In order to realize at least one of the above-described problems, a lumbar support device reflecting one aspect of the present invention is provided.
A seat back frame provided on a seat back having a horizontal portion extending in the horizontal direction and supporting the back of the seated person;
A warpage plate provided with a hinge portion rotatably engaged with the horizontal portion at one end in the vertical direction;
A drive mechanism provided on the seat back frame, connected to the other end portion of the warp plate in the vertical direction, and changing the degree of curvature of the warp plate by moving the other end portion toward / separate from the one end portion; ,
It is characterized by having.

Other features of the present invention will become more apparent from the following detailed description and accompanying drawings.

According to the present invention, there is provided a lumbar support device in which the drive unit does not increase in size.

Other effects of the present invention will become more apparent from the following embodiments and the accompanying drawings.

It is a disassembled perspective view of the lumbar support apparatus of embodiment. It is a perspective view explaining the seat back provided with the lumbar support device of an embodiment. It is the perspective view seen from the arrow III direction of FIG. 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 the perspective view seen from the arrow V direction of FIG. It is a figure which shows the side surface of the curvature plate of FIG. It is a figure explaining the action | operation of the drive mechanism of FIG. It is a figure explaining holding | maintenance with the curvature plate and reinforcement plate of FIG. It is a perspective view explaining the attachment structure with the base plate of FIG. 1, a fish mouth spring, and a big wire. It is the perspective view seen from the arrow X direction of FIG. It is a perspective view explaining the attachment structure of the curvature plate shown in FIG. 1, and a big wire.

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 an exploded perspective view of the lumbar support device of the embodiment, FIG. 2 is a perspective view for explaining a seat back provided with the lumbar support device of the embodiment, and FIG. 3 is a perspective view seen from the direction of arrow III in FIG. is there.

1 to 3, the arrow F direction indicates the front side direction of the seat back (the direction in which the seated person seated on the seat back faces), 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 includes a main frame and a big wire.

As shown in FIG. 2, the main frame has a right frame 1a and a left frame 1b. An upper frame 1c is provided so as to bridge the upper part of the right frame 1a and the upper part of the left frame 1b. 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. And the lower frame 1h which bridges the lower part of the right frame 1a and the lower part of the left frame 1b is provided.

As shown in FIG. 1, on the front side of the seat back of the sub-upper frame 1g and the lower frame 1h of the seat frame 1, a spring material having a circular cross-sectional shape is bent to form a substantially U-shape that supports the back of the seated person. A big wire (a part of the seat back frame) 7 is arranged.
The big wire 7 of the present embodiment is positioned below the left and right upper vertical extending

portions

7a and 7b positioned above, the left and right middle vertical extending

portions

7c and 7d positioned in the middle of the vertical direction. It has left and right lower vertical extending

portions

7h, 7i. The left and right upper vertical extending

portions

7a and 7b, the left and right middle vertical extending

portions

7c and 7d, and the left and lower lower vertical extending

portions

7h and 7i are arranged so as to be symmetrical with respect to the left and right. The left and right intervals between the middle vertical extending

portions

7c and 7d are narrower than the left and right intervals between the upper

vertical extending portions

7a and 7b. The left and right intervals between the lower

vertical extending portions

7h and 7i are narrower than the left and right intervals between the middle vertical extending

portions

7c and 7d.

The lower ends of the upper

vertical extending portions

7a and 7b and the upper ends of the middle vertical extending

portions

7c and 7d are connected to the

inclined portions

7e and 7f. The lower end portion of the lower vertical extending portion 7h and the lower end portion of the lower vertical extending portion 7i are connected by a bridging portion 7g.

The lower ends of the middle vertical extending

portions

7c and 7d and the upper ends of the lower vertical extending

portions

7h and 7i are connected by

horizontal portions

7j and 7k extending in the horizontal direction.

As shown in FIG. 2, 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.

As shown in FIG. 1, a base plate 11 provided with a drive mechanism 9 is attached to the back side of the seat back below the big wire 7. The details of the drive mechanism 9 will be described later.

As shown in FIG. 2, 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.

As shown in FIG. 1, the fish mouth spring 13 has

base portions

13a and 13b. The

base portions

13a and 13b are 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 h and 7 i of the big wire 7.
The fish mouth spring 13 has rising

portions

13c and 13d,

base facing portions

13e and 13f,

torsion arm portions

13g and 13h, and an attachment portion 13i. The rising

portions

13c and 13d extend upward from the ends on the right frame 1a and left frame 1b side of the seat back frame 1 of the

base portions

13a and 13b. The

base facing portions

13e and 13f are bent from the tip portions of the rising

portions

13c and 13d and extend toward the lower vertical extending

portions

7h and 7i of the big wire 7. The

torsion arm portions

13g and 13h are bent from the tip portions of the

base facing portions

13e and 13f and extend toward the bridging portion 7g of the big wire 7. The attachment portion 13 i bridges the tip portions of the

torsion arm portions

13 g and 13 h and extends along the bridge portion 7 g of the big wire 7.
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, in the fish mouth spring 13, the

base portions

13a and 13b, the rising

portions

13c and 13d, and the

base facing portions

13e and 13f serve as the base ends to which the

torsion arm portions

13g and 13h are fixed, and the mounting portion 13i is the torsion. This corresponds to the tip of the

arm portions

13g and 13h.

Next, the attachment of the base plate 11, the big wire 7, and the fish mouth spring 13 will be described with reference to FIGS. 9 is a perspective view for explaining attachment of the base plate, the fish mouth spring, and the big wire in FIG. 1, and FIG. 10 is a perspective view as seen from the direction of arrow X in FIG.

The left and right side portions of the base plate 11 are formed with two side caulking portions 11a extending in the horizontal direction, for a total of four. The side caulking portion 11 a is caulked so as to wind the lower vertical extending

portions

7 h and 7 i of the big wire 7. Accordingly, the lower vertical extending

portions

7 h and 7 i of the big wire 7 are attached to the base plate 11.

Two lower caulking portions 11b extending downward are formed at the bottom of the base plate 11. The lower caulking portion 11 b is caulked so as to wind the bridging portion 7 g of the big wire 7 and the attachment portion 13 i of the fish mouth spring 13. Thereby, the bridging portion 7 g of the big wire 7 and the attachment portion 13 i of the fish mouth spring 13 are attached to the base plate 11.

A substantially plate-like warping plate 23 is made of resin on the front side of the seat back of the lower vertical extending

portions

7h and 7i of the big wire 7. The degree of curvature of the warp plate 23 can be changed by the drive mechanism 9.

Next, the mounting structure between the upper part of the warping plate 11 and the big wire 7 will be described with reference to FIG. FIG. 11 is a perspective view illustrating a mounting structure between the warp plate and the big wire shown in FIG. A hinge portion 23b that is rotatably engaged with the

horizontal portions

7j and 7k of the big wire 7 is integrally formed on the upper portion of the main body 23a, which is a curved portion of the warp plate 23.

The hinge part 23b includes a hinge body 23a extending in the width direction of the seat back and a cantilever retaining part 23f. The hinge main body 23e has a groove 23d in which an opening into which the

horizontal portions

7j and 7k of the big wire (seat back frame) 7 are inserted is formed. The retaining portion 23f has elasticity. The retaining portion 23f protrudes from the main body portion 23a and faces the opening of the groove 23d through the space.

In the present embodiment, the distance between the facing surface of the retaining portion 23f that opposes the hinge main body portion 23e and the opening of the groove 23d of the hinge main body portion 23e is equal to or greater than the diameter of the big wire 7 (vertical thickness). Has been. Furthermore, a protrusion 23g that protrudes in the direction of the hinge body 23e at the tip of the retaining part 23f and whose distance between the tip and the hinge body 23e is less than the diameter (the thickness in the vertical direction) of the big wire 7 is provided. Is formed.

When the

horizontal portions

7j and 7k of the big wire 7 are pressed against the distal end portion of the retaining portion 23f of the hinge portion 23b and the distal end of the retaining portion 23f is bent upward, the distance between the convex portion 23g and the hinge main body portion 23e. Becomes larger than the diameter of the big wire 7. Therefore, by inserting the

horizontal portions

7j and 7k of the big wire 7 into the groove 23d, the hinge portion 23b of the warping plate 23 can be attached to the

horizontal portions

7j and 7k of the big wire 7.
In a natural state where no force is applied to the tip of the retaining portion 23f, the distance between the convex portion 23g of the retaining portion 23f and the hinge main body portion 23e is less than the diameter (the thickness in the vertical direction) of the big wire 7. For this reason, the

horizontal portions

7j and 7k of the big wire 7 are prohibited from leaving the groove 23d to the outside.

Next, the drive mechanism will be described with reference to FIGS. 1 to 5, 7, and 9 to 10. 4 is a perspective view of the lumbar support device according to the present embodiment in a state in which the warp plate is deformed in a direction of pressing the back of the seat occupant, FIG. 5 is a perspective view seen from the direction of arrow V in FIG. 4, and FIG. It is a figure explaining the action | operation of the drive mechanism of FIG.
As shown in FIGS. 1 and 4, a central portion on the front side of the seat back in the base plate 11 has a first standing wall portion 51 extending in the vertical direction, and a second standing wall portion 53 parallel to the first standing wall portion 51. A bridging portion 56 that bridges the first standing wall portion 51 and the second standing wall 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 (which extends in the vertical direction also in the second standing wall portion 53 and faces the first guide hole 51a ( 5) is formed.

As shown in FIG. 9, the lower end surface of the first standing wall portion 51 and the lower end surface of the second standing wall portion 53 are abutting

portions

51 d and 53 d that abut on the bridging portion 7 g of the big wire 7.

Further, as shown in FIGS. 9 and 10, the first recessed portion 51 c and the second recessed portion 53 c that engage with the step portion 13 j of the fish mouth spring 13 are formed at the lower portions of the first standing wall portion 51 and the second standing wall portion 53. Is formed. 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.
As shown in FIG. 1, 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.

As shown in FIG. 1, 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 and nuts 55a and 57a. 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. In attaching the gear box 59, a tapping screw that does not require a nut may be used instead of the fastening screws 55 and 57 and the nuts 55a and 57a.
The 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 59. A washer 52 is fitted into a portion of the screw rod 63 protruding from the gear box 59, and a stopper nut 54 is further screwed.

Further, at the center of the lower portion of the base plate 11, a first standing wall portion 51, a second standing wall portion 53, and a bridging portion 56, projecting in the surface direction of the seat back, and a convex portion 58 capable of supporting the seated person's pelvis is provided. Is formed.

A notch 23 h that prevents interference with the convex portion 58 of the base plate 11 is formed in the lower center portion of the warp plate 23. At the lower portion of the warp plate 23, a mounting portion 23i is formed in the portion other than the notch 23h over the entire width direction of the warp plate 23.

As shown in FIG. 6, a hole 23j extending in the width direction of the warp plate 23 is formed in the mounting portion 23i. In the present embodiment, the cross-sectional shape of the hole 23j is a long hole shape. A hole 63a (see FIG. 1) orthogonal to the axis of the screw rod 63 is formed in the lower portion of the screw rod 63, and a rod (pin: mounting member) 65 (see FIG. 10) is fitted into the hole 63a. . In the present embodiment, the inner diameter of the hole 63a is set larger than the outer diameter of the rod 65, and an elastic bush 66 (see FIG. 9) is press-fitted between the hole 63a and the rod 65. The rod 65 passes through the first guide hole 51a of the first standing wall portion 51 of the convex portion 58 and the second guide hole 53a of the second standing wall portion 53, and is loosely fitted into the hole 23j of the mounting portion 23i of the warp plate 23. . That is, the connection between the rod 65 and the lower portion of the warp plate 23 is a hinge connection.

For this reason, the screw rod 63 is prohibited from rotating around the axis of the screw rod 63 and can be moved relative to the motor 61 along the axis. 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 in the axial direction with respect to the motor 61, and the rod 65 fitted to the screw rod 63 moves along the first guide hole 51a and the second guide hole 53a. Accordingly, the lower part of the warp plate 23 also moves along the first guide hole 51a and the second guide hole 53a.

In the present embodiment, the drive mechanism 9 includes a gear box 59 having a nut member, a motor 61 that rotationally drives the nut member in the gear box 59, a screw rod 63 that is screwed into the nut member in the gear box 59, and a screw rod 63. And a rod 65 for connecting the lower part of the warp plate 23, a second guide hole 53 a for the second standing wall 53 through which the rod 65 is inserted, and a first guide hole 51 a for the first standing wall 51.

Next, the reinforcing plate 101 will be described with reference to FIGS. 1, 3, 5, 6, 8, and 11. 6 is a view showing a side surface of the warp plate 23 of FIG. 1, and FIG. 8 is a view for explaining the holding of the warp plate 23 and the reinforcing plate 101 of FIG.

On the back surface of the warp plate 23, two strip-shaped reinforcing plates 101 extending in the vertical direction are provided. A rectangular hole 101 a is formed in the lower portion of the reinforcing plate 101. A convex portion 23 l that engages with the hole 101 a of the reinforcing plate 101 is formed at the lower portion of the warp plate 23. Furthermore, a lower portion of the warp plate 23 includes a base portion 23m that faces the lower end surface of the reinforcing plate 101, a bent portion 23n that is bent from the tip portion of the base portion 23m and that faces the upper surface of the lower portion of the reinforcing plate 101. A convex portion 23o is formed.

The lower part of the reinforcing plate 101 is held by the warp plate 23 by the convex part 23l engaged with the hole 101a of the reinforcing plate 101 and the holding convex part 23o.

Further, the back surface of the warp plate 23 covers the peripheral surface of the reinforcing plate 101 with a space therebetween, and two guides 23p as a non-interference part that allows the reinforcing plate 101 to move in the vertical direction with respect to the warp plate 23 and one guide 23p. A guide 23q is formed.

Next, the operation of the above configuration will be described with reference to FIGS. 2 to 5 and FIG.

The state shown in FIGS. 2 to 3 is a state in which the screw rod 63 is positioned below, the degree of curvature of the warping plate 23 is small, and the deformation is hardly deformed in the direction of pressing the back of the seated person.

From this state, when the motor 61 is driven to rotate in one direction, the nut member in the gear box 59 rotates in one direction, and the screw rod 63 rises as shown in FIG. Since the upper part of the warp plate 23 is prohibited from being raised and lowered by the hinge part 23b, the lower part of the warp plate 23 is raised as shown in FIGS. As a result, the warp plate 23 is greatly curved and presses the back of the seated person.

4-5, when the motor 61 is driven to rotate in the other direction, the nut member in the gear box 59 rotates in the other direction, the screw rod 63 descends, and the warping plate 23 The degree of curvature is reduced. As a result, the amount of deformation in the direction of pressing the back of the seat seated person is reduced.

In addition, when the warpage plate 23 is curved, the attachment portion 23 i of the warpage plate 23 is in sliding contact with the base plate 11. In the present embodiment, as shown in FIG. 7, the slidable contact surface 23 r of the attachment portion 23 i of the warp plate 23 is an arc surface.

Further, the convex portion 58 of the base plate 11 of the present embodiment functions as a pelvis support portion that supports the pelvis of the seated person when the lower portion of the warp plate 23 is raised.

According to the above configuration, the following effects can be obtained.

(1) Unlike the embodiment described above, when the upper part of the warp plate 23 is fixed to the big wire 7, the upper part of the warp plate 23 is fixed when a force is applied to the lower part of the warp plate 23. The force is transmitted to the big wire 7 through the fixing portion of the big wire 7 that performs. For this reason, the big wire 7 will be twisted. In order to counter the reaction force caused by the twisting of the big wire 7, the drive mechanism 9 needs to apply a large force to the warpage plate 23. For this reason, the drive mechanism 9 will be enlarged.
Therefore, according to the lumbar support device according to this embodiment described above, the upper portion of the warp plate 23 is supported so as to be rotatable with respect to the big wire 7. Furthermore, since the warpage plate 23 can be bent between the upper portion and the lower portion, even if a force is applied to the lower portion of the warpage plate 23, the force is not easily transmitted to the big wire 7 that supports the upper portion of the warpage plate 23. For this reason, it is not necessary for the drive mechanism 9 to apply a large force to the warpage plate 23 in order to curve the warpage plate 23. For this reason, the enlargement of the drive mechanism 9 can be suppressed.

(2) Since the hinge portion 23b of the warpage plate 23 is formed integrally with the warpage plate 23, the hinge portion can be realized with a simple configuration.

(3) By forming the retaining portion 23f having elasticity, the hinge portion 23b can be prevented from coming off from the big wire 7, and the big wire 7 can be easily attached to the hinge portion 23b.

(4) Since the connection between the rod 65 of the drive mechanism 9 and the warp plate 23 is a hinge connection, the connection portion between the drive mechanism 9 and the warp plate 23 is not twisted when the warp plate 23 is bent, and smooth operation is achieved. can get.

(5) Since the drive mechanism 9 for converting the rotational motion into the linear motion is composed of the screw rod 63 and the nut member, the drive unit can be miniaturized.

In addition, this invention is not limited to the said embodiment. In the above-described embodiment, the warp plate 23 is used in which the upper part is rotatably supported by the seat back frame 1 and the lower part moves in the vertical direction and can be deformed in the direction of pressing the back of the seat occupant. The warp plate may be deformable in a direction in which the lower part is rotatably supported by 1 and the upper part moves in the vertical direction and presses the back of the seat occupant.

In the above embodiment, the drive mechanism 9 uses the motor 61, but it may be manually operated.

Furthermore, the sliding surface 23r of the warp plate 23 and the base plate 11 may be configured to be in line contact.

This application is based on a Japanese patent application filed on November 7, 2012 (Japanese Patent Application No. 2012-245718), the contents of which are incorporated herein by reference.

7 Big wire (seat back frame)
7j, 7k Horizontal portion 9 Drive mechanism 23 Warpage plate 23b Hinge portion

Claims

A seat back frame provided on a seat back having a horizontal portion extending in the horizontal direction and supporting the back of the seated person;
A warp plate provided with a hinge part rotatably engaged with the horizontal part at one end part;
A drive mechanism provided on the seat back frame, connected to the other end of the warp plate, and changing the degree of curvature of the warp plate by moving the other end toward / separate from the one end;
A lumbar support device comprising:
The hinge portion is integrally formed with the warping plate,
The lumbar support device according to claim 1, wherein the hinge portion is a groove into which a horizontal portion of the seat back frame is inserted from an opening.
It has elasticity, opposes the opening of the groove through a space, and allows the horizontal part of the seat back frame to be inserted into the groove by elastic deformation, and in the natural state, the horizontal part of the seat back frame The lumbar support device according to claim 2, further comprising a retaining portion that prohibits separation from the groove.
The lumbar support device according to claim 1, wherein the connection of the drive mechanism with the other end of the warp plate is a hinge connection.
The drive mechanism has a screw rod and a nut member,
Either one of the screw rod and the nut member is attached to the seat back frame,
The other of the screw rod and the nut member is attached to the warp plate,
The member attached to the warp plate is provided with a rod extending in a direction intersecting with the screw rod,
The lumbar support device according to claim 1, wherein a hole in which the rod is loosely fitted is formed in the warp plate.