JP3330776B2 - Seat support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat support device incorporated in a seat back for supporting a specific portion of an upper body of a seated person from behind to stabilize a seated posture and reduce fatigue.

[0002]

2. Description of the Related Art In general, the shape of a back column having the least degree of fatigue at the time of sitting is said to be a substantially inverted S shape from various studies. And it is thought that the collapse of the back pillar shape from the substantially inverted S shape is a major cause that makes the seated person feel fatigue, and the mechanism of occurrence is that the muscle balance is lost, that is, muscle fatigue is the cause. It is said.

[0003] Therefore, for example, a lumbar that presses and supports the lumbar vertebrae portion with an appropriate supporting force to maintain the spine in a substantially inverted S shape to reduce fatigue at the time of seating and stabilize the seating posture. A support device is widely mounted on a vehicle seat such as an automobile.

[0004]

By the way, since various operations such as steering operation and safety confirmation are required for an automobile driver, the upper body tends to move variously. However, the substantially inverted S-shaped back column shape is a comfortable posture when the upper body is at rest, and in a so-called dynamic posture with movement, the lumbar support device supports the lumbar spine effectively. In addition, there is a possibility that the occupant (driver) may feel instability depending on the degree of movement.

In particular, in the known lumbar support device, since the upper body of the occupant is forcibly formed into a substantially inverted S shape by local pressing of the lumbar vertebra portion, the pressing portion by the lumbar support device, that is, the supporting portion There is a possibility of giving a sense of discomfort, discomfort or the like.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a seat support device capable of securing a comfortable posture of a seated person without locally supporting the body of the seated person.

[0007]

According to the present invention, an upper support plate and a lower support plate formed in advance and divided into a substantially crank-shaped upper support member and a lower support member are provided. Each is attached rotatably. And the upper and lower support plates can support at least the thoracic vertebra part of the seated person, and the lower support plate can support at least the pelvic part of the seated person by the pivotal support of each terminal of the upper and lower support members. , Built into the seat back.

A sector gear fixed to the end of the lower support member is meshed with a pinion that rotates in conjunction with the driving means, and a pair of left and right link arms is provided at each end of the upper and lower support members. , Protruding in the direction orthogonal to the axis. Then, a pair of right and left connecting means is provided between the upper and lower link arms, and the upper and lower supporting members are connected so as to be interlockable, and the respective supporting members are rotated synchronously with the operation of the driving means. The upper support plate and the lower support plate can be moved synchronously in the front-rear direction.

[0009] Further, the upper supporting member includes a horizontal shaft portion for supporting the upper support plate, a support shaft for supporting the horizontal shaft portion on the left and right sides of the horizontal shaft portion so as to be movable up and down, and
The support member is formed so as to have a combination with a pair of left and right support shafts continuously having ends serving as fulcrums of the support member. A return spring is provided so that an upward biasing force can be applied to the horizontal shaft portion, and the return spring can be interlocked with the horizontal shaft portion.
The adjusting means is connected, and the vertical position of the upper support plate can be independently adjusted and set independently by the vertical movement of the horizontal shaft portion along the support shaft of the support member accompanying the operation of the adjusting means.

[0010]

According to the present invention, since the upper body of the occupant is supported by both the thoracic vertebra and the pelvis, the support corresponding to the dynamic posture becomes possible. And the upper support plate,
Since the lower support plate moves synchronously in the front-rear direction by the operation of the driving means, an appropriate sitting posture can be secured without complicating the operation.

Further, since the upper and lower positions of the upper support plate can be adjusted independently and arbitrarily, only the position supported by the upper support plate can be adjusted according to the occupant's body shape without the vertical movement of the lower support plate. Can be set arbitrarily.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

As shown in FIGS. 1 and 2, a seat support device 10 according to the present invention includes an upper support plate 12 and a lower support plate 14 which are divided in advance, and is built in a seat back 16. ing.

The upper support plate 12 and the lower support plate 14 are rotatably mounted on upper and lower support members 18 and 20 each having a substantially crank shape. Then, for example, the upper support plate 12 is provided between the left and right sides of the seat back 16, the lower support members 18 and 20 are erected, and the lower support is provided at a place where the upper support plate 12 can support the thoracic vertebra of the seated person from behind. Plates 14 are provided at positions where the pelvis of the seated person can be supported from behind.

As can be seen from FIG. 3 in addition to FIGS. 1 and 2, each end of the upper and lower support members 18, 20 is, for example, a push nut (also referred to as a speed nut) 22 to the extension end. , 23 are pivotally supported at corresponding portions of the pair of left and right base brackets 24, 26, respectively. And the seat back frame 28 of the seat back 16
The upper and lower support members 18 and 20 are supported and pivotally supported between the left and right sides of the seat back 16 by the respective attachment of the base brackets 24 and 26 to the left and right sides of the seat back 16.

As shown in FIG. 1 and FIG. 2, in the embodiment, both the upper support plate 12 and the lower support plate 14
a and 14a, respectively, and the upper support plate and the lower support plate correspond to the upper support plate and the lower support plate by winding bent pieces around the horizontal shaft portions 18a and 20a of the upper and lower support members 18 and 20. Each is rotatably attached to a member.

However, the upper support plate
It is sufficient that the lower support plate 14 is rotatably attached to the corresponding horizontal shaft portions 18a, 20a of the corresponding support members, so that the lower support plate 14 is not limited to the bent pieces 12a, 14a. , The upper support plate and the lower support plate may be respectively attached to the horizontal shaft portions of the corresponding support members.

As shown in FIGS. 1 to 3, a sector gear 36 is fixed to, for example, one end of the lower support member 20, and a pinion 40 rotated by a driving means 38 is provided with a sector gear. Are engaged. Driving means
As the 38, for example, an operation dial 44 whose rotation is restricted by a brake member 42 can be used, and the other end of a drive shaft 46 to which the operation dial is fixed at one end is provided with a pinion 40.
Are integrally rotatably mounted.

In such a configuration, the pinion 40 rotates in the corresponding direction under the operation of the operation dial (drive means) 44, and accordingly, the sector gear 36 moves the lower support member 20.
The lower support plate 14 moves in the front-rear direction by rotating about the end of the support member together with the support member.

The lower support member 20 is provided with a lower support plate 14, for example, as shown in FIG.
The seating surface 16a is provided to be rotatable forward within a predetermined range so as to push a corresponding portion of the seating surface by a specific amount from a predetermined rear end position where the seating surface 16a does not protrude.

As shown in FIGS. 1 to 3, for example, a pair of left and right link arms 32 are provided at the left and right ends of the upper support member 18, and a pair of right and left link arms 34 are provided at the lower support member 20. At the left and right ends, they protrude in a direction perpendicular to the axis of the horizontal shaft portions 18a and 20a, and are provided so as to be integrally rotatable.

The upper and lower support members 18, 20
Each of the pair of left and right connecting means 48 between the link arms 32, 34 of the above, the upper, lower support member,
The upper support plate 12 and the lower support plate 14 are rotatably connected in synchronization with each other in the same direction, that is, movably connected in the same direction. As the connecting means 48, for example, a connecting spring composed of a tension coil spring can be used, and the connecting spring is stretched by locking each terminal to the upper and lower link arms 32, 34.

In this configuration, the lower support member 20 is driven directly by the operation of the operation dial 44, and the upper support member 18 is interlocked by the rotation of the drive side. Each is formed as a driven side.

As in the case of the lower support member 20, the upper support member 18 moves the upper support plate 12 from, for example, a predetermined rear end position where the seating surface 16a of the seat back 16 is not projected as shown in FIG. , Is provided so as to be rotatable forward within a predetermined range so as to push a corresponding portion of the seating surface by a specific amount.

For example, assume that the state shown in FIG. 1 is the initial state of the seat support device 10. In this initial state, the upper support plate 12 and the lower support plate 14 are both located at the rear end positions where the seating surface 16a of the seat back does not protrude, and these positions are the initial states of the upper support plate and the lower support plate. Is set as the support position (support position).

When the operation dial 44 is rotated, for example, in a counterclockwise direction indicated by an alternate long and short dash line arrow from such an initial support position, under the corresponding rotation of the pinion 40, the sector gear 36 supports the lower. It rotates clockwise with the member 20. Then, accompanying this, the lower link arm 34
As a result, the upper link arm 32 is pulled through the connection spring (connection means) 48, and the upper support member 18 rotates counterclockwise in conjunction with the lower support member 20. Move.

That is, the lower support member 18 is rotated clockwise in synchronization with the operation of the operation dial 44, and the upper support member 20 is rotated counterclockwise in synchronization with the rotation.
Upper support plate 12, Lower support plate 14
Moves by a corresponding amount while pushing the seating surface forward.

The thoracic vertebra and pelvis of the seated person (driver) are supported (supported) by the moved upper support plate 12 and lower support plate 14, respectively. It is adjusted as needed.

When the operation force of the operation dial 44 is released at the positions of the upper support plate 12 and the lower support plate 14 suitable for the posture required by the seated person, the pinion 40, Since the rotation of the sector gear 36 is restricted, the front and rear positions of the upper support plate and the lower support plate, that is, the support force of the seat support device 10 can be arbitrarily adjusted and set.

On the contrary, the upper support plate is formed by pushing the seating surface 16a of the seat back forward.
12. When the operation dial 44 is rotated in the reverse direction (clockwise) at the support position in front of the lower support plate 14, the lower support member 20 is rotated by the rotation of the sector gear 36 accompanying the pinion 40. The lower support plate 14 is moved backward in the counterclockwise direction, that is, in the initial position direction.

The upper support plate 12 is moved backward by a corresponding amount in synchronization with the lower support plate 14 by the interlocking movement of the upper support member 18 via the connecting spring 48. With the release of the operation force of 44, the support force of the upper support plate and the lower support plate is again adjusted and set arbitrarily.

As described above, unlike the known lumbar support device that locally presses and supports the lumbar portion of the occupant, the seat support device 10 of the present invention uses the upper support plate 12 to support the thoracic vertebra portion. In addition, the lower support plate 14 supports the pelvis to define the body posture of the seated person.

The thoracic spine of the human body is fixed by ribs,
Since it is a so-called rigid body, by supporting the thoracic vertebra of the seated person from behind, it is possible to sufficiently support the upper body more stably than a lumbar vertebra having a large degree of freedom in movement. And
Upper support plate located in the thoracic region of the occupant
According to 12, the weight of the upper body of the seated person is received, so that the intensive burden of the weight on the lumbar spine at the time of seating is reliably prevented.

That is, since the burden on the lumbar vertebra is reduced, the accumulation of fatigue in the lumbar vertebra is sufficiently suppressed even in the sitting posture.

Further, since the pelvis portion, which is also a rigid body, is supported from behind by the lower support plate 14, the pelvis portion, that is, the buttocks of the seated person are prevented from moving backward, so that the lumbar portion is moved backward in the lumbar spine portion. The curvature of the back column is reliably prevented. Therefore, the seat support device 10 of the present invention
According to the method, the unnatural form of the back column caused by the backward bending of the lumbar portion is reliably prevented, and the uncomfortable feeling and discomfort of the occupant can be sufficiently suppressed.

Further, since the upper support plate 12 and the lower support plate 14 can be moved back and forth in synchronization under the operation of the operation dial 44, the occupant's body shape, preferences, etc. can be obtained without complicated adjustment operations. Can easily be set to individual sitting postures according to the conditions. Therefore, operability and comfort are surely improved.

Further, since the upper and lower support members 18 and 20 are connected to each other on the left and right sides by the extension of the pair of left and right connection springs 48, the load from the upper body of the occupant can be reduced. With this, the upper support plate 12 can be surely prevented from tilting in the left-right direction, that is, so-called one-handedness.
Therefore, the support effect by the upper support plate 12 functions reliably, and the comfort of the occupant is improved.

Here, in the embodiment, the connecting spring 48 composed of a tension coil spring is used as the connecting means, but it is sufficient to connect the upper and lower support members 18 and 20 in an interlockable manner. However, for example, the upper and lower support members may be connected by a rigid connection link or the like.

However, if the upper and lower supporting members 18 and 20 are connected by the connecting spring 48, the load from the front, for example, the load (weight) by the upper body of the occupant can be reduced.
It is elastically supported under the spring force of the connecting spring 48. For example, even if the load in the direction of the white arrow shown in FIG. 1 acts on the upper support plate 12 under the movement of the upper body of the occupant, the load is absorbed by the extension of the connection spring 48. Therefore, a feeling of bottoming, pressure, and the like are not given to the thoracic spine of the seated person. Therefore, the connecting spring 48 is used as connecting means.
With the use of, the comfort of the occupant is further improved.

Since the pelvis portion of the seated person does not move very much in the front-back direction, even if the pelvis portion is rigidly supported by the lower support plate 14, the comfort of the seated person may be adversely affected. In addition, by firmly supporting the pelvis, it is possible to increase the sense of stability of the sitting posture. In other words, the support of the pelvis and the thoracic vertebrae of the seated person is divided into rigid and elastic, so that appropriate support for each part of the upper body can be easily obtained. And safety can be sufficiently ensured.

In this configuration, by changing the length ratio of the upper and lower link arms 32, 34, the amount of movement of the upper support plate 12 following the movement of the lower support plate 14 is changed. be able to. That is, the ratio of the movement amount of the upper support plate 12 to the rotation amount of the lower support plate 14, that is, the operation dial 44 can be appropriately selected and adjusted according to the thickness of the cushion body of the seat back 16, the shape of the seat, and the like. The seat support device 10 of the present invention can be easily applied widely to various seats, and the range of use of the support device is reliably expanded.

In the embodiment, the driving means 38 is exemplified by a combination of a manual operation dial 44 and a brake member 42. However, the present invention is not limited to this.
A motor may be used as the driving means, and an automatic configuration in which the pinion is rotated under drive control of the motor may be employed.

By the way, the height of the thoracic vertebrae of the seated person, that is, the vertical position is shifted according to the body shape, especially the height of the sitting height. Therefore, the supporting position may be changed in the vertical direction according to the body shape of the seated person. . However, when the entire support device of the seat is simply moved up and down, even the lower support plate 14 that supports a substantially constant pelvic portion regardless of the body shape moves up and down together with the upper support plate 12, so that the seated The proper support of the upper body may be impaired.

Therefore, in the present invention, only the vertical position of the upper support plate 12 can be arbitrarily adjusted and set without changing the vertical position of the lower support plate 14.

As can be seen from FIGS. 2 and 3, the upper support member 18 is disposed on the left and right sides of the horizontal shaft 18a for supporting the upper support plate 12 and the horizontal shaft. A pair of left and right support shafts that can be supported up and down freely
It is formed by a combination with 50. The spindle 50 is
For example, a support shaft 50a that supports the horizontal shaft portion 18a so that it can move up and down.
And a stepped portion 50b, which is a continuous fulcrum of the support member 18, is bent and formed into a substantially L-shaped front surface and is symmetrically arranged.

The support member 18 is assembled into a substantially crank shape by loosely inserting the support shaft 50a of the support shaft portion into the through hole 52 of the end of the horizontal shaft portion 18a, and the end portions of the support member 18 to the base brackets 24 and 26 are formed. The seat back 16
It is erected and supported between the left and right sides.

After the horizontal shaft 18a is inserted into the end of the horizontal shaft 18a, the horizontal shaft is prevented from being detached from the support shaft by fitting the locking pin 54 into the extended end of the support shaft 50a. I have.

Here, the return spring 56 applies an upward biasing force to the horizontal shaft portion 18a, that is, the upper support plate.
It is arranged so that 12 can be given. As the return spring 56, for example, a compression coil spring wound around a support shaft between the end of the horizontal shaft portion 18a and the support piece 58 of the support shaft 50a can be used.

The adjusting means 60 is operatively connected to the horizontal shaft 18a. The adjusting means 60 includes, for example, a lead screw 64 having an adjustment dial 62 which can be integrally rotated at one end, and a screw 66 which is screwed to the lead screw so as to be able to advance and retreat under the rotation of the lead screw. And a nut-shaped block piece 68 sandwiched between them.

The lead screw 64 is installed and pivotally supported between the base 66a of the bracket 66 and the base bracket 24 with the adjustment dial 62 positioned outside, and the nut-like block 68 is connected to a pair of side portions of the bracket. It is non-rotatably supported by pinching between 66b.

In such a configuration, the lead screw 64 is integrally rotated in the corresponding direction with the rotation operation of the adjustment dial 62, and the lead screw 64 is screwed under the rotation of the lead screw.
By retraction, the nut-shaped block piece 68 is moved in the left-right direction in FIG. 3 along the axis of the lead screw.

As shown in FIGS. 2 and 3, the nut-shaped block 68 is connected to the left and right side ends of the horizontal shaft portion 18a of the upper support member 18 via cable wires 70 (L, R). Each is linked so that it can be linked. Cable wire 70
(R, L) is formed, for example, with a cable body 70b that is movable with respect to the cover 70a, and the nut-shaped block piece 68 and the horizontal shaft 18
a is connected so that it can be linked.

The cover 70a of the cable wire is, for example, connected to the base 66a of the bracket and the support piece 58 of the support shaft.
Respectively.

For example, assume that the vertical position shown in FIG. 3 is the initial position of the upper support plate 12. From this initial position, when the nut-shaped block piece 68 is screwed rightward in the drawing under the rotation of the lead screw 64 by the adjustment dial 62, the horizontal shaft portion 18a of the support member of the upper becomes the cable wire 70 ( R, L), the upper support plate 12 is lowered from the initial position by the downward movement of the horizontal shaft along the support shaft 50a by the biasing force of the return spring 56.

At the position of the upper support plate 12 corresponding to the height of the thoracic vertebrae of the seated person, the adjustment dial 62
Is released, the vertical position of the upper support plate can be arbitrarily adjusted and set by restricting the movement of the nut-shaped block piece 68 with respect to the lead screw 64.

When the adjustment dial 62 is rotated in the direction opposite to the above at an arbitrary vertical position of the upper support plate 12, the nut-shaped block piece 68 retreats leftward in the figure with respect to the lead screw 64. The extension of the cable body 70b from the cover 70a on the horizontal shaft side
The horizontal shaft portion 18a is pushed up under the biasing force of the return spring 56, whereby the upper support plate 12
Rises.

As described above, in this configuration, the vertical position of only the upper support plate 12 can be adjusted without involving the lower support plate 14. In other words, the support position of the upper support plate 12 can be adjusted and set arbitrarily according to the height of the thoracic vertebra part that varies depending on the body shape of the seated person, etc. , Comfort is definitely improved.

The vertical position of the lower support plate 14 does not change with respect to the vertical movement of the upper support plate 12, so that the lower support plate does not shift from the pelvis of the occupant and the comfort of the occupant is impaired. Absent.

Further, the upper supporting member 18 is connected to the horizontal shaft portion 18.
a and a pair of left and right support shaft portions 50, and a nut-like shape that moves upward under the biasing force of the return spring 56 to move the horizontal shaft portion upward and moves under the rotation of the adjustment dial 62. It suffices to connect the horizontal axis portion to the block piece 68 so as to be interlockable, so that the seat support device 10 that can perform an accurate operation can be easily secured without complicating the configuration.

Further, the vertical position of the upper support plate 12 can be arbitrarily adjusted in a stepless manner by rotating the adjustment dial 62, so that the seat support device 10 excellent in operability can be provided.

Further, by the connection with the cable wires 70 (R, L), the ends of the left and right sides of the horizontal shaft portion 18a operate synchronously with the movement of the nut-shaped block piece 68, so that the left and right supports are provided. Parallel and smooth vertical movement with respect to the shaft portion 50 can be easily ensured.

Here, in the embodiment, the combination of the lead screw 64 and the nut-shaped block piece 68 is exemplified as the adjusting means 60, but the horizontal shaft portion is interlocked through the cable wire 70. 18a, that is, it is sufficient if the vertical position of the upper support plate 12 can be regulated and adjusted. Therefore, the present invention is not limited to this. For example, a configuration using a cam or the like may be used.

However, if the lead screw 64 and the nut-shaped block piece 68 are combined, and the nut-shaped block piece and the horizontal shaft portion 18a are operatively connected by the cable wire 70, a simple structure can be achieved. Since the position can be easily adjusted in stages, high operability and comfort can be sufficiently secured.

In the embodiment, the compression coil spring wound around the support shaft 50a between the end of the horizontal shaft portion 18a and the support piece 58 of the support shaft portion is exemplified as the return spring 56. Since it is sufficient that the horizontal shaft portion, that is, the upper support plate 12 can be displaced upward, it is not limited to this. For example, a return spring is formed from another spring member such as a bamboo shoot spring or a tension coil spring. Is also good.

However, if a compression coil spring disposed between the end of the horizontal shaft portion 18a and the support piece 58 of the support shaft portion is used as the return spring 56, the structure becomes complicated and the arrangement portion becomes large. , And an accurate application of the upward biasing force can be easily obtained. Therefore, also from this point, the configuration can be simplified.

Incidentally, in the above embodiment, the upper support plate 12 and the lower support plate 14 are embodied as being moved synchronously in the same front and rear direction. However, the present invention is not limited to this. The sheet support device 10 may be configured so that the upper support plate and the lower support plate can be moved synchronously in the direction.

The seat support device of the present invention is not limited to a seat for a driver of an automobile, but may be mounted on a seat for an assistant (navigator). Further, the seat support device of the present invention is suitable for seats of automobiles and the like, but is not limited thereto. For example, the seat support device may be applied to seats of trains, airplanes, ships and the like.

In addition to these vehicle seats,
Various seats that can sit for a long time, for example,
The seat support device of the present invention can also be used for office office seats, theater seats such as movie theaters, conference room seats, and library seats.

The embodiments described above are for explaining the present invention, and do not limit the present invention in any way.
It goes without saying that all modifications and alterations within the technical scope of the present invention are included in the present invention.

[0070]

As described above, according to the seat support device of the present invention, the upper body support plate supports the thoracic vertebra and the lower support plate supports the pelvic region, so that the occupant's upper body posture can be improved. Since the regulation is possible, the weight burden on the lumbar vertebra in the sitting posture can be reduced, and the accumulation of fatigue on the lumbar vertebra can be sufficiently suppressed.

Then, in order to secure a seating posture suitable for the occupant under appropriate support of both the thoracic vertebrae and the pelvis, local pressing is eliminated and discomfort to the occupant, discomfort, etc. Granting is reliably prevented.

In addition, since the upper support plate and the lower support plate can be moved back and forth in synchronization under the operation of one driving means, the occupant's body shape and taste can be adjusted without complicated adjustment operations. It is possible to easily set the corresponding individual sitting posture. Therefore, operability and comfort are surely improved.

Further, since the upper and lower positions of the upper support plate can be adjusted and set arbitrarily without involving the lower support plate, it is possible to easily support the thoracic vertebrae according to the body shape, particularly the sitting height, and to ensure comfort. Be improved.

The upper support member is formed from a combination of a horizontal shaft portion and a pair of left and right support shaft portions. The horizontal shaft portion is biased upward by the biasing force of the return spring, and the adjusting means is actuated. It is sufficient to connect the horizontal shaft portion so as to be interlocked with the above, so that it is possible to easily secure a seat support device capable of performing an accurate adjustment operation without complicating the configuration.

Further, if the upper and lower support members are operatively connected by the connection spring, even if the body of the occupant moves at the front position of the upper support plate,
Since the load is absorbed by the extension of the connecting spring,
It does not give the occupant a feeling of bottoming or oppression. In other words, since the support of the thoracic vertebra and pelvis of the seated person can be obtained separately by elastic support and rigid support, appropriate support according to each without lowering the sense of stability of the sitting posture Therefore, the comfort of the occupant is reliably improved.

Further, according to the adjusting means for combining the lead screw and the nut-shaped block piece and operatively connecting the nut-shaped block piece and the horizontal shaft portion with the cable wire, the simple structure, Since the position can be easily adjusted in stages, high operability and comfort can be sufficiently secured.

If a compression coil spring wound between the end of the horizontal shaft and the support piece of the support shaft is used as the return spring, the structure becomes complicated and the arrangement portion becomes large. Without the above, accurate application of the upward biasing force can be easily obtained. Therefore, also from this point, the configuration can be simplified.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a seat support device according to the present invention in an initial state.

FIG. 2 is a schematic exploded perspective view of a seat support device.

FIG. 3 is a schematic front view of the support device for the seat, partially broken, in an initial state.

[Explanation of symbols]

 10 Seat support device 12 Upper support plate 14 Lower support plate 16 Seat back 16a Seat back seating surface 18, 20 Upper, lower support member 18a Horizontal shaft part 32, 34 Upper, lower link arm 36 Sector gear 38 Driving means 40 Pinion 42 Brake member 44 Operation dial 48 Connecting means (connecting spring) 50 Support shaft 50a Support shaft 50b End 56 Return spring (compression coil spring) 58 Supporting piece 60 Adjusting means 62 Adjusting dial 64 Lead screw 68 Nut-shaped block piece 70 (R, L) Cable wire

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-29610 (JP, A) JP-A-6-72194 (JP, A) JP-A-59-22524 (JP, A) JP-A-6-224 72201 (JP, A) JP-A-6-72205 (JP, A) JP-A-6-72206 (JP, A) JP-A-6-72210 (JP, A) JP-A-6-72214 (JP, A) JP-A-5-176826 (JP, A) JP-A-6-64550 (JP, U) JP-A-61-185347 (JP, U) JP-A-1-151746 (JP, U) JP-A-4-133393 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) A47C 7/46 B60N 2/22

Claims (4)

(57) [Claims] An upper support plate and a lower support plate formed in advance by division are rotatably attached to upper and lower support members each having a substantially crank shape, and pivotally supported at respective ends of the support members. By
The upper support plate is built into the seat back at a position where the lower support plate can support at least the thoracic vertebrae of the seated person, and the lower support plate is fixed at the end of the support member of the lower at a position where the lower support plate can support at least the pelvis of the seated person. The sector gear is engaged with a pinion that rotates in conjunction with the driving means, and a pair of left and right link arms are provided at respective ends of the upper and lower support members so as to protrude in a direction orthogonal to the axis, respectively. The upper and lower support members are connected between the left and right sides of the upper and lower link arms so as to be interlocked with each other. The upper support plate and the lower support plate can be moved synchronously in the front and rear direction, and the upper support member is A horizontal shaft portion for supporting the upper support plate; a support shaft for supporting the horizontal shaft portion so as to be able to move up and down on the left and right sides of the horizontal shaft portion; A return spring is provided so that an upward biasing force can be applied to the horizontal shaft, and an adjusting means is connected to the horizontal shaft so as to be interlocked therewith. A seat support device in which the vertical position of the upper support plate can be independently adjusted and set independently by the vertical movement of the horizontal shaft along the support shaft of the support shaft caused by the operation of the adjusting means. 2. An upper support plate and a lower support plate, which are formed in advance and are divided, are rotatably mounted on upper and lower support members having a substantially crank shape, respectively. By
The upper support plate is built in the seat back at a position where the lower support plate can support at least the thoracic vertebrae of the seated person, and the lower support plate is fixed to the end portion of the lower support member at a position where the lower support plate can support at least the pelvis of the seated person. And a pair of left and right link arms are provided at respective ends of the upper and lower support members so as to protrude in a direction orthogonal to the axis, respectively. A pair of left and right connection springs composed of springs are stretched between the upper and lower link arms, respectively, and the upper and lower support members are connected so as to be interlocked on the left and right sides,
The upper support plate and the lower support plate can be moved synchronously in the front-rear direction by the synchronized rotation of each support member accompanying the operation of the driving means, and the upper support member supports the upper support plate horizontally. A combination of a shaft portion; a support shaft for supporting the horizontal shaft portion on the left and right sides of the horizontal shaft portion so as to be able to move up and down, and a pair of left and right support shaft portions having a continuous end portion serving as a fulcrum of the entire support member A return spring is provided so that an upward biasing force can be applied to the horizontal shaft portion, and an adjusting means is connected to the horizontal shaft portion so as to be interlocked therewith. A seat support device in which the vertical position of the upper support plate can be independently adjusted and set independently by the vertical movement of the horizontal shaft along the support shaft of the support shaft. 3. An adjustment means comprising: a lead screw having an adjustment dial which is integrally rotatable at one end; a bracket screwed to the lead screw and capable of being advanced and retracted under rotation of the lead screw. A nut-like block piece sandwiched between; a nut-like block piece and a cable wire operatively connected between the horizontal shaft portions; 3. The seat support device according to claim 1, wherein the horizontal shaft portion is vertically movable along the support shaft of the support shaft portion. 4. The compression spring according to claim 1, wherein the return spring is a compression coil spring wound around the support shaft of the support shaft between the end of the horizontal shaft and the support piece of the support shaft. Support device for the described seat.