JPH0119896Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a device for adjusting the longitudinal and vertical positions of a lumbar support provided in a seat back of a vehicle seat.

"Prior Art and its Problems" Lumbar supports for vehicle seats come into contact with and support the lumbar region of the driver, and have traditionally been used to create a more comfortable and less tiring driving posture. This lumbar support is required to be able to adjust its longitudinal and vertical positions according to the physique and preferences of the driver, and for this purpose, various adjustment mechanisms have been proposed in the past. However, in conventional devices, the lumbar support is generally supported on one of the left and right seat back frames within the seat bag, and therefore there are problems with the stability and durability of the lumbar support, and improvements have been desired.

``Purpose of the invention'' The purpose of the invention is to solve the problems of such conventional devices and improve the stability and durability of the lumbar support by using a mechanism different from conventionally known mechanisms. .

``Summary of the invention'' In this invention, the lumbar support is supported almost symmetrically on the left and right seat back frames, and can be adjusted forward and backward and up and down. The bracket is fixed, and the left and right connecting brackets are supported vertically movably between the vertical guide shafts fixed to the left and right lumbar brackets.
A lumbar support is supported at one end of each of the left and right swing brackets, and the left and right swing brackets are linked to each other. It is characterized by being provided with a front-rear operating mechanism that swings one of the brackets around the vertical guide shaft, and a vertical operating mechanism that moves the left and right connecting brackets up and down along the vertical guide shaft.

``Embodiments of the invention'' The invention will be described below with reference to illustrated embodiments. Inside the seat back 11 of the vehicle seat 10 (see FIG. 4), pipe-shaped seat back frames 12 and 13 are located on the left and right sides, and lumbar brackets 14 and 15 are mounted on the seat back frames 12 and 13, respectively. Fixed. The left lumbar bracket 14 also supports the adjustment mechanism and is U-shaped, with support plates 1 above and below it.
A vertical guide shaft 18 is supported and fixed between 6 and 17. On the other hand, the right lumbar bracket 15
has a deformed U-shape in which the width on the seat back frame 13 side is narrow and the width on the inner end side is wide, and a vertical guide shaft is installed between the upper and lower support plates 19 and 20 on the wide inner end side. 21 is fixed.

A left and right connecting bracket 22 is supported on the left and right vertical guide shafts 18, 21 so as to be movable up and down.
Further, left and right swing brackets 23 and 24 are pivotally mounted coaxially to the vertical guide shafts 18 and 21. The left and right connecting bracket 22 has upper and lower guide shafts 18 and 21 attached to ears 25 that protrude forward from the top, bottom, right and left.
A U-shaped swinging bracket 2 is provided on the outside of the upper and lower ears 25.
Upper and lower support plates 27 and 28 of 3 and 24 are located. That is, the swing brackets 23, 24 are shaped to wrap around the left and right connecting brackets 22 from the outside, and the left and right link brackets 22 and the swing brackets 23, 24 always move up and down together, and the swing brackets 23, 24 always move up and down together. 24 is supported by the left and right connecting brackets 22 so as to be able to swing around the upper and lower guide shafts 18 and 21. 29 is a synthetic resin sleeve fitted on the outside of the upper and lower guide shafts 18 and 21 and fixed to the left and right connecting brackets 22;
It functions to reduce the frictional resistance of the vertical movement of the left and right connecting brackets 22.

Support plates 27, 28 of swing brackets 23, 24
The spacing is set narrower than the spacing between the support plates 16, 17 and the support plates 19, 20 of the lumbar brackets 14, 15, and the swing brackets 23, 24 can move up and down by the difference in the spacing between them. The support plates 27, 2 of the swing brackets 23, 24
The tip of 8 is bent upward into a substantially L-shape while keeping the spacing almost the same, and the fixing brackets 30, 30 and fixing pins 31, 31 are attached to the ends.
A lumbar support RS consisting of a lumbar plate 32 and a lumbar pad 33 is fixed thereto. The surface of the lumbar pad 33 fixed to the front side of the lumbar plate 32 is exposed and directly constitutes a part of the seat back 11. In the conventional lumbar support, the lumbar plate was located within the cover of the seat back 11 and was not exposed, so the lumbar pad 33 moved.
Another feature of the lumbar support adjustment device of this embodiment is that the lumbar support adjustment device is exposed.

The rear side of the swing brackets 23 and 24 is
Between the upper support plates 27 and 27 are pins 34 and 34.
The swing bracket 2 is connected by an interlocking bar 35 via
3, 24 and this interlocking bar 35 constitute a parallel crank mechanism. Therefore, when one of the swinging brackets 23, 24 is swung around the vertical guide shafts 18, 21, the other swings in conjunction with the lumbar support fixed to the swiveling brackets 23, 24.
This allows the RS to change its position back and forth without tilting. In addition, the left and right connecting brackets 22 are connected to the vertical guide shaft 1.
When the lumbar support RS is moved up and down along lines 8 and 21, both the swing brackets 23 and 24 move up and down, and the lumbar support RS changes its position up and down. Reference numeral 36 (see FIG. 3) is a tension spring that urges the left and right connecting brackets 22 to move downward, and is stretched between the left and right connecting brackets 22 and the support plate 17 of the lumbar bracket 14.

Next, the front and rear adjustment mechanism for swinging one of the swing brackets 23 and 24 and the left and right connecting brackets 2 are installed.
The vertical adjustment mechanism for vertically moving 2 will be explained. The left swing bracket 23 has its support plates 27, 2.
8, interlocking ears 38, 38 are provided protrudingly provided, and one ends of interlocking links 40, 40 are pivotally attached to these interlocking ears 38, 38 by pins 39, 39. An interlocking pin 41 is suspended between the other ends of the interlocking links 40, 40, and this interlocking pin 41 is inserted into a female thread block 42.

The female thread block 42 has a hollow longitudinal adjustment shaft 43.
The longitudinal adjustment shaft 43 is screwed into the male threaded portion 44 of the
It is rotatably supported by a lumbar bracket 14 so as not to move in the axial direction. A longitudinal adjustment handle 45 is integrally provided on the protrusion of the longitudinal adjustment shaft 43 from the lumbar bracket 14.

Therefore, according to this longitudinal adjustment mechanism, when the longitudinal adjustment shaft 43 is rotated via the longitudinal adjustment handle 45, the internal thread block 42 changes its axial position. Since the interlock pin 41 moves together with the female thread block 42, the swing bracket 23 swings about the vertical guide shaft 18 via the interlock link 40 and pin 39. The swinging motion of the swinging bracket 23 is also transmitted to the right swinging bracket 24 via the interlocking bar 35, and the swinging bracket 24 is fixed to the swinging brackets 23 and 24 so that the swinging bracket 24 also swings equally. The lumbar support RS will change its position forward and backward.

Next, the vertical adjustment mechanism of the lumbar support RS will be explained. The left and right connecting bracket 22 has a rearwardly bent rack plate 50 at its left end.
is integrally provided on this rack plate 50,
A rack 51 in the vertical direction is formed. The auxiliary bracket 37 fixed between the upper and lower support plates 16 and 17 of the lumbar bracket 14 has a pinion 52 that meshes with this rack 51, and a pinion 52 that engages with this rack 51.
A vertical operation shaft 53 and a brake mechanism 54 are supported. The vertical operation shaft 53 passes through the hollow longitudinal adjustment shaft 43 and projects to the outside, and a vertical adjustment handle 55 is provided at the projecting end.

The brake mechanism 54 rotates the pinion 52 together with the vertical operation shaft 53 when rotational force is applied from the vertical operation shaft 53 side, but conversely, the brake mechanism 54 rotates the pinion 52 integrally with the vertical operation shaft 53.
When rotational force is applied from the side, the pinion 5
It has the effect of applying a brake to the rotation of 2.
Conventionally, it has been widely used, for example, in vehicle window regulators.

This brake mechanism 54 will be explained with reference to FIGS. 5 and 6. The pinion 52 is fitted onto the vertical operation shaft 53 so as to be able to rotate freely relative to the vertical operation shaft 53, and a pair of radial cores 56,
56 is provided integrally with the pinion 52, and a claw portion 5 formed integrally with the pinion 52 is provided in the space between the cores 56, 56.
7,57 is located.

The cores 56, 56 and the claws 57, 57 are inserted into a brake case 58 fixed to the auxiliary bracket 37, and the inner circumference of the brake case 58 and
A torsion spring 59 is inserted between the outer periphery of the core 56 and the claw portion 57. The hooks 59a and 59b at both ends of the torsion spring 59 are
It is located between the core 56 and the claw part 57, and the core 5
6, that is, when the vertical operation shaft 53 rotates, the diameter is reduced to reduce the friction with the brake case 58, and when the claw portion 57, that is, the pinion 52, is rotated, the diameter is expanded to reduce the friction with the brake case 58. It is starting to increase.

Therefore, when the vertical operation shaft 53 is rotated via the vertical adjustment handle 55, the core 56 reduces the diameter of the torsion spring 59. The signal can be transmitted to the pinion 52 via. On the other hand, when rotational force is applied to the pinion 52 from the left and right connecting bracket 22 (rack 51) side, the pawl portion 57 expands the diameter of the torsion spring 59 and increases the friction with the brake case 58.
The pinion 52 cannot be rotated.

As is clear from the above description, in this device having the above configuration, the vertical position of the lumbar pad 33 can be adjusted by rotating the vertical adjustment handle 55. When the vertical adjustment handle 55 is rotated, the vertical operation shaft 53 and the brake mechanism 5
4, the pinion 52 rotates, and the pinion 52
is engaged with rack 51, so rack 51
A left and right connecting bracket 22 having a left and right side is guided by synthetic resin sleeves 29, 29 and vertical guide shafts 18, 21 on its left and right sides to move up and down. The swing brackets 23 and 24 supporting the left and right sides of the lumbar support RS are connected to this left and right connecting bracket 22.
Therefore, by rotating the vertical adjustment handle 55, the lumbar support RS moves up and down. lumbar support
When a vertical force is applied from the RS side, the brake mechanism 54 prevents rotation of the pinion 52, so the lumbar support RS does not change its vertical position even if the vertical adjustment handle 55 is not operated.

To adjust the longitudinal position of the lumbar support RS, rotate the longitudinal adjustment handle 45. Then, since the female thread block 42 moves in the axial direction, the interlocking pin 41 and the interlocking link 4
0, the swing bracket 23 connects to the vertical guide shaft 18.
oscillates around. The swinging motion of the swinging bracket 23 is transmitted to the right swinging bracket 24 via the interlocking bar 35, so that the left and right lumbar supports RS are Change position forward and backward in a well-balanced manner.

In addition, in the above embodiment, the lumbar pad 33 of the lumbar support RS is exposed and the seat back 11 is
However, the lumbar support adjustment device of the present invention can be similarly applied to a type of lumbar support adjustment device in which a lumbar plate is positioned within the cover of the seat bag 11.

"Effects of the Invention" As described above, the lumbar support adjustment device of the present invention has lumbar brackets provided on the left and right sides, and a left and right connecting bracket that allows the lumbar support to move up and down on the vertical guide shafts provided on each of the lumbar brackets. , and a swinging bracket that is movable back and forth, the lumbar support can be supported in a well-balanced manner on the left and right sides. Therefore, the stability of the support of the lumbar support can be increased, and through stability, the durability can also be increased.

[Brief explanation of the drawing]

Fig. 1 is a rear view showing an embodiment of the lumbar support adjustment device of the present invention, Fig. 2 is a plan view of Fig. 1,
3 is an exploded perspective view of the same, FIG. 4 is a perspective view of the entire seat, FIG. 5 is a sectional view taken along line V-V in FIG. 1, and FIG. 6 is an exploded perspective view of the brake mechanism. 11... Seat back, 12, 13... Seat back frame, 14, 15... Lumbar bracket, 18, 21... Vertical guide shaft, 22... Left and right connection bracket, 23, 24... Swing bracket, 32... ...Lumber plate, 33...Lumber pad, 35...Interlocking bar, 40...Interlocking link, 41...Interlocking pin, 42...Female thread block, 43...Fore/aft adjustment shaft, 45...Fore/aft adjustment handle, 51... Rack, 52...Pinion, 53
... Vertical adjustment axis, 54 ... Brake mechanism, 55 ...
...Vertical adjustment handle, lumbar support RS.

Claims (1)

[Scope of claim for utility model registration] (1) Lumbar brackets are fixed to the left and right seat back frames in the seat bag, and the left and right connecting brackets are moved vertically between the vertical guide shafts fixed to the left and right lumbar brackets. At the same time, a swinging bracket is supported on the left and right vertical guide shafts, which can move up and down integrally with the left and right connecting brackets, and can swing around the vertical guide shafts. a back and forth operation mechanism that supports a lumbar support on the bracket, interlocks the left and right swinging brackets, and swings one of the swinging brackets around the vertical guide shaft;
A lumbar support adjustment device comprising a vertical operation mechanism for vertically moving the left and right connecting brackets along a vertical guide shaft. (2) In claim 1 of the utility model registration claim, the vertical operation mechanism includes a rack formed on the left and right connecting brackets, a pinion that meshes with the rack,
There is a vertical operation shaft that rotates this pinion, and when rotational force is applied from this vertical operation shaft side, the pinion rotates together, and when rotational force is applied from the pinion side, the rotation of the vertical operation shaft is A lumbar support adjustment device consisting of a braking mechanism and a brake mechanism. (3) In claim 1 of the utility model registration claim, the longitudinal adjustment mechanism comprises an interlocking link having one end pivotally connected to one swing bracket, a female screw block having the other end of the interlocking link pivotally connected, and this female screw. A lumbar support adjustment device comprising a longitudinal adjustment shaft that is screwed onto a member and moves the internally threaded member in the axial direction as it rotates.