JP3012765B2 - Seat equipment - 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 device which can hold a seated person's pelvis behind and maintain a stable seating posture without burden on the lumbar spine. It is used for a vehicle seat.

[0002]

2. Description of the Related Art Conventionally, as this kind of seat device, for example, a railway vehicle seat 1 as shown in FIG.
There is a vehicle seat as disclosed in Japanese Patent Application Laid-Open No. 59705/59. In the seat 1 for a railway vehicle shown in FIG. 4, a seat back 3 is supported at the rear end of the seat cushion 2 in a tiltable manner, and a lower portion 3 a of the seat back 3 adjusts the front-rear position by rotating a cam 4. A support board 5 is provided to hold the seated person A behind the pelvis.

In the vehicle seat disclosed in the above publication,
A hip support is provided in the lower space of the seat back so as to be tiltable in the front-rear direction, and a fit board that can rotate by rotation of a gear and presses a lower part of a lumbar spine of a seated person is provided in the hip support. I have.

By the way, in any of the above sheets,
The mechanism (cams, gears, etc.) for adjusting the position of each board that holds the vicinity of the back of the pelvis of the occupant A is configured separately and independently of the reclining mechanism for adjusting the tilt of the seat back. Are also performed completely separately.

[0005]

However, in the various seat devices as described above, as shown in FIG. 5, when the occupant tilts the seat back backward in order to take a relaxed posture, he / she himself / herself may not be able to use the seat back. Due to the weight of the hips, the buttocks tend to slide forward slightly, and the pelvis usually moves away from the backrest surface of the seat back.
When this happens, the seated person's buttocks are not sufficiently supported and become unstable, and the weight of the seated person's upper body is concentrated near the lumbar vertebra in contact with the backrest surface of the seat back, causing low back pain, There is a possibility that it will take too much.

Therefore, every time the occupant leans the seat back backward, the board must be tilted forward separately from the backward leaning operation to adjust again so that the back of the pelvis is sufficiently held. However, there is a problem that the operation is troublesome and the usability is not good.

The present invention has been made in view of such a conventional problem. When the seat back is tilted backward, the lower portion of the seat back, which automatically holds the rear of the pelvis, tilts forward, It is an object of the present invention to provide a seat device that is easy to use without the need to separately adjust the lower portion of the seat back and that can provide a stable seating feeling and is hard to be tired.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention is to provide a seat device (10) which can hold a seated person behind the pelvis and can maintain a stable seated posture without burden on the lumbar spine. ) And the seat back (3
A back frame (31) provided inside the seat back (0) is tiltably supported behind the seat cushion (20), and can be tilted below the seat back (30) so as to hold the back of the pelvis of the seated person. A movable support portion (30a) is formed, and the movable support portion (30a) is tiltably supported on the back frame (31) with its upper end as a tilt center, and is provided at a rear end of the seat cushion (20). The connecting link (50) is pivotally supported so as to be rotatable, and an operating end (at the lower end side of the back frame (31) extending from the tilting center side of the back frame (31) to one end (50a) of the connecting link (50). 34), an engagement pin (35) is protruded from the working end (34), and the engagement pin (35) is fitted to one end (50a) of the connection link (50) on the rear side. And push and pull An operating end (34) is formed at one end of the connecting link (50) so that a guide groove (51) is formed therein and the connecting link (50) is rotated forward as the seat back (30) tilts rearward. (50a) so as to be able to be pushed and pulled, and an output pin (52) projecting from the other end (50b) of the connecting link (50) near the front, and one side of a lower end portion of the movable support portion (30a). The output pin (5
The guide groove (4) into which the guide groove (2) is fitted so as to be able to be pushed and pulled.
2) is formed, and the other end (50b) of the connecting link (50) is connected to the movable supporting part (3) so that the movable supporting part (30a) is tilted forward with the forward rotation of the connecting link (50).
0a). The seat device (10) is characterized in that it is connected to one side surface of the lower end portion so as to be able to be pushed and pulled.

[0009]

The occupant of the seat device (10) can move the movable support portion (30a) formed under the seat back (30).
Thus, the back of the pelvis is sufficiently held, whereby a load is not applied to the vicinity of the lumbar spine, and a stable seating feeling that does not become tired even when sitting for a long time can be obtained. When the occupant tilts the seat back (30) backward to take a more relaxed posture, for example, the working end (34) on the lower end side of the back frame (31) extending from the tilt center of the back frame (31) is raised. The seat back (30) tilts forward, opposite to the backrest surface.

With the forward tilt of the operating end (34) due to the backward tilt of the seat back (30), the operating end (3)
The connecting link (50) pivotably supported at the rear of the seat cushion (20) is pivotally supported so as to be pushed forward. Here, the engagement pin (35) protruding from the working end (34) is fitted so as to be guided by a guide groove (51) formed at one end (50a) of the connection link (50), and They are connected so that they can be pushed and pulled. With the forward rotation of the connection link (50), the lower end of the movable support portion (30a), which is connected to the other end (50b) so as to be able to push and pull, is connected to the seat back (3).
It is pushed so as to come further forward than the backrest surface of 0) and tilts forward. Here, the output pin (52) protruding from the other end (50b) of the connecting link (50) is connected to the movable support (30).
a) is fitted so as to be guided by a guide groove (42) formed on one side surface of the lower end portion, and is connected to each other so as to be able to be pushed and pulled.

When the occupant tilts the seat back (30) backward, a buttocks shift phenomenon occurs in which the buttocks slide slightly forward due to their own weight, but as described above, the rear of the seat back (30) is caused. In synchronization with the tilting, the movable support portion (30a) is automatically tilted forward so as to come further forward than the backrest surface of the seat back (30), and the pelvis of the seated person who is displaced forward is sufficiently held. .

Accordingly, even if the seat back (30) is tilted backward, the buttocks that have been displaced forward are held in a stable state without any special operation by the occupant, and the occupant is kept behind the pelvis. From the lumbar vertebra to the vicinity of the seat back (30) with a wider area. Therefore, the seated person does not have a possibility of hurting the lower back or the like, and a stable seating feeling can be obtained.

When the seat back (30) is tilted forward to return the seat back (30) from the tilted state to the normal state, the connecting link (50) is turned on.
The movable support part (30a)
Apart from the forward tilt of the entire seat back (30), the seat tilts rearward from the state where it has tilted forward and returns to the original seated state.

[0014]

An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show one embodiment of the present invention. As shown in FIG. 1, the seat device 10 includes a seat cushion 20 fixed to a vehicle floor 11 via a footrest 12, and a seat back 30 supported at the rear of the seat cushion 20 so as to be tiltable. Do it. In addition, a movable support portion 30a that can be tilted so as to hold a seated person behind the pelvis is formed at a lower portion of the seat back 30.

As shown in FIG. 2, the seat cushion 20
The cushion frame 21 provided inside is a rectangular frame that extends long in both side directions, and has a front end 21a and a rear end 21a.
b, and both sides 21c, 21c. A hard board 22 is mounted inside the framework. The armrests 23, 21c are provided on both sides 21c, 21c, respectively.
23 is fixed. Further, a support member 24 for supporting a pair of seat backs 30, 30 arranged on both sides thereof is provided substantially at the center of the rear end 21b.

The back frame 31 housed in each seat back 30 is formed in an inverted U-shape and has an upper end 31.
c and both side portions 31a and 31b extending downward from both ends thereof. A hard board 32 is attached to the upper half between the side portions 31a and 31b. Such a back frame 31 is tiltably supported behind the seat cushion 20. More specifically, the lower ends of both sides 31a and 31b of the back frame 31 are pivotally mounted to the armrest 23 and the support member 24, respectively.
3, 33, it is pivotally supported on the rear side of the seat cushion 20.

The both sides 31a, 31 of the back frame 31
A pelvis (pelvis) support board 40 provided inside the movable support portion 30a is tiltably supported on the lower half side between "b" and "b" to hold the pelvis behind the seated person. More specifically, pivot shafts 41, 41 are respectively provided at predetermined positions on both side portions 31a, 31b located above the pivot shaft 33, which is the tilt center of the entire seat back 30, and
The pervis support board 4 is connected via each of the rotating shafts 41.
0 is rotatably supported at the upper end 40a.

The lower end 40b of the pelvis support board 40 is set so as to be tilted forward about the pivots 41 so as to hold the buttocks of the occupant from behind. In addition, the lower end portion 40 of the pelvis support board 40
b, the other end 50b of the connecting link 50 described later
A guide groove 42 is formed for connection to be able to push and pull.

An operating end 34 is formed at the lower end of one side 31a of the back frame 31 so as to extend from a pivot hole 33a serving as a tilting center to one end 50a of a connecting link 50 described later. The working end 34 bends obliquely rearward from the vicinity of the pivot hole 33a, and then bends obliquely forward again. An engagement pin 35 for projecting and connecting to one end 50a of the connection link 50 so as to be able to be pushed and pulled is protruded from a bending portion located substantially at the middle of the operation end 34.

A connection link 50 is pivotally supported in the vicinity of both ends of the rear end of the cushion frame 21 via a support bracket 25 so as to be rotatable in the front-rear direction. Connecting link 50
A guide groove 51 into which the engaging pin 35 of the working end 34 is fitted and guided so as to be able to be pushed and pulled is fitted to the rear end 50a of
Are formed. An engagement pin 35 that rotates forward around a pivot 33 as the seat back 30 tilts rearward is fitted into the guide groove 51 so as to relatively move from the lower edge side to the upper edge side. That is, the connecting link 50 is pushed forward by the engagement pin 35 with the backward tilt of the seat back 30, whereby the connecting link 50 is set to rotate forward around the support bracket 25.

On the other hand, the other end 50b of the link 50
An output pin 52 which is fitted into the guide groove 42 of the pelvis support board 40 and is guided so as to be able to be pushed and pulled is provided in a protruding manner. When the connecting link 50 rotates forward, the output pin 52 engages with the guide groove 42 of the pelvis support board 40.
This is for pushing the pelvis support board 40 forward while relatively moving from the upper edge side to the lower edge side, thereby tilting the pelvis support board 40 forward.

As shown in FIG. 1, the cushion frame 2
A drive cylinder 60 that urges the back frame 31 in the forward tilt direction is provided below 1. The drive cylinder 60 is a general gas or hydraulic cylinder.
The front end 61 of the drive cylinder 60 is supported on the front side of the cushion frame 21 via the mounting bracket 26, and the rear end 62 is connected to the lower end 36 of the working end 34 so as to be able to be pushed and pulled.

A lock mechanism (not shown) is provided beside the drive cylinder 60. This lock mechanism fixes the rear end portion 62 side of the drive cylinder 60 at a predetermined position, thereby holding the seat back 20 at a desired tilt angle. An operation knob for releasing the restriction by the lock mechanism is provided on, for example, the inner surface or the tip of the armrest 23.

That is, when the occupant adjusts the tilt angle of the seat back 30, the restrained state is first released by the operation knob of the lock mechanism, and the driving cylinder 6 is thereby released.
After setting the desired angle by, for example, pushing down the seat back 30 that is about to lean forward with the biasing force of 0 on the back, the rear end 62 of the drive cylinder 60 is again moved to the position by the release knob. And restrain it.

Next, the operation will be described. As shown by the solid line in FIG. 3, when the seat back 30 is at the normal position (A),
The occupant of the seat device 10 can move the movable support portion 30 which is also in the normal position (A ′) below the seat back 30.
The back of the pelvis is sufficiently held by a. Thereby, the occupant can obtain a stable sensation of sitting near the lumbar spine and not tired even after sitting for a long time.

If the occupant wants to take a more relaxed posture, the lock mechanism is operated to move the seat back 30 backward to the relaxed position (B) as shown by the two-dot broken line in FIG. You only have to tilt. When the seat back 30 tilts rearward in this manner, the working end 34 extending below the pivot 33, which is the tilt center of the back frame 31, tilts forward, opposite to the backrest surface of the seat back 30.

In FIG. 1, when the operating end 34 is tilted forward, the engaging pin 35 at a substantially intermediate position thereof moves relatively from the lower edge side to the upper edge side in the guide groove 51 of the connecting link 50, and Push one end 50a of 50 forward.
As a result, the connection link 50 pivots forward about the support bracket 25 in the counterclockwise direction in the figure as the seat back 30 tilts rearward. As described above, when the link 50 is rotated forward, the output pin 52 at the other end 50 b is connected to the guide groove 4 of the pelvis support board 40.
The lower end portion 40b of the pelvis support board 40 is pushed forward while relatively moving from the upper edge side to the lower edge side in 2.

Thus, the normal position (A) in FIG.
When the seat back 30 is tilted rearward from the seat back to the relaxed position (B), the movable support portion 30a retained on the pelvis support board 40 only tilts forward to the position (B ') where it must move. Not the connection link 5
By being pushed to 0, it turns clockwise in the figure around the turning shaft 41. As a result, the movable support portion 30a is tilted forward by an angle θ to a position (C ′) further forward than the backrest surface of the seat back 30.

When the seat back 30 is tilted backward,
Most occupants have a buttocks slippage phenomenon in which the buttocks slide slightly forward due to their own weight, but as described above, the movable support portion 30a
Automatically tilts further forward than the backrest surface, and can sufficiently hold the back of the pelvis of the seated person who is displaced forward.

As described above, even if the seat back 30 is tilted backward, the buttocks displaced forward are held in a stable state without any special operation by the occupant, and the occupant can maintain the lumbar spine from behind the pelvis. In the vicinity, the seat back 30 can be leaned with a larger area. Therefore,
The seated person does not have a risk of injuring the waist and the like, and a stable sitting feeling can be obtained.

When the seat cushion 20 is tilted forward to return the seat back 30 from the tilted state to the normal state, the movable support portion 30a and the entire seat back 30 are connected to each other due to the mutual connection relationship of the connection links 50 and the like. Is tilted backward from the state where it was separately tilted forward and returns to the original normal position.

The seat device according to the above-described embodiment is specifically a passenger seat for a railway vehicle, but is not limited to the illustrated embodiment, and may be a seat for a general passenger car. Needless to say, there may be.

[0033]

According to the seat apparatus of the present invention, the working end at the lower end of the back frame is rotated so that the connecting link pivotally supported by the rear end of the seat cushion is rotated forward as the seat back tilts rearward. Is connected to one end of the connection link, and the other end of the connection link is connected to the movable support part so as to be able to be pushed and pulled. Because the part automatically tilts forward more than the backrest surface of the seat back,
The rear of the seated pelvis can be sufficiently maintained by following the rear of the seated pelvis that is displaced forward when the seat back is tilted backward.

Therefore, even if the seat back is tilted backward, the buttocks displaced forward are held in a stable state by the movable support portion without any special operation by the occupant. In addition, the seated person can lean on the seat back side with a larger area from the back of the pelvis to the vicinity of the lumbar vertebra, and can obtain a stable seating feeling without burden on the waist and the like even when sitting for a long time.

[Brief description of the drawings]

FIG. 1 is a side view showing a seat device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a seat device according to one embodiment of the present invention.

FIG. 3 is an operation explanatory view showing an operation of the seat device according to one embodiment of the present invention.

FIG. 4 is a side view showing a conventional seat device.

FIG. 5 is an operation explanatory view showing the operation of the conventional seat device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Seat apparatus 20 ... Seat cushion 30 ... Seat back 30a ... Movable support part 31 ... Back frame 34 ... Working end 40 ... Pelvis support board 50 ... Connection link

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A47C 7/46 B60N 2/22 B61D 33/00

Claims (1)

(57) [Claims] 1. A seat device that holds a seated person behind the pelvis and maintains a stable sitting posture without burden on the lumbar spine, wherein a back frame provided in a seat back can be tilted behind a seat cushion. A movable support portion that supports and can be tilted so as to hold the back of the pelvis of a seated person is formed at a lower portion of the seat back, and the movable support portion can be tilted to the back frame with its upper end portion as a tilt center. Supporting the connecting link at the rear end of the seat cushion so as to be rotatable in the front-rear direction, and actuating the lower end of the back frame extending from the tilt center side of the back frame to one end closer to the rear of the connecting link. An end is formed, an engagement pin protrudes from the working end, and a guide that is engaged with the engagement pin at one end near the rear of the connection link so as to be pushed and pulled. The working end is connected to one end of the connecting link so as to be able to be pushed and pulled so that the connecting link rotates forward with the rearward tilting of the seat back, and the output is output to the other end of the connecting link closer to the front. A pin is protruded, and a guide groove is formed on one side surface of the lower end portion of the movable support portion so that the output pin is fitted and guided so as to be able to be pushed and pulled. A seat device wherein the other end of the connection link is connected to one side surface of a lower end portion of the movable support portion so that the movable support portion can be tilted forward.