JPH0527085Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention changes the inclination angle of the upper end of the seat back in conjunction with the reclining movement of the seat back relative to the seat cushion. This invention relates to an improvement of a seat device equipped with a folding type seat back whose shape can be changed to a state suitable for the tilting angle of reclining to improve sitting comfort for a seated person.

[Conventional technology]

For example, in the case of vehicle seats, a number of seat configurations have been proposed in the past, in which the seat cushion etc. are configured to be slidable in the front and rear directions of the seat, and the seat back is configured to be tiltable and adjustable using a reclining mechanism. .

By the way, in the most common vehicle seats as described above, the seat back is constructed in one piece, and the inclination angle of the seat back can only be adjusted by a reclining mechanism with respect to the seat cushion. However, with such a conventional seat structure, the seat back is normally in an upright position, so this is not a major problem. When a person's line of sight is directed toward the ceiling and looking forward, the seat surface at the top of the seat back and the seated person's upper back become separated, which impairs the ability to hold the seat in that area. This has resulted in problems such as poor sitting comfort, inability to maintain a stable sitting posture, and easy fatigue.

In order to solve this problem, for example, Japanese Patent Publication No. 60-57328 discloses a structure in which the upper part of the seat back is divided from the lower part of the seat back, and these parts are pivotally supported and connected in a swingable manner, and a link mechanism is used. Conventionally, a seat structure with a center-folding type seat back, in which the upper part of the seat back is rotated relative to the lower part of the seat back in conjunction with the reclining movement, and thereby secures the ability to hold the seated occupant, has been developed. It had been proposed.

[The problem that the idea aims to solve]

However, in a vehicle seat having such a conventional structure, the seat cushion side and the upper frame on the upper part of the seat back are simply connected by a link lever that constitutes a link mechanism.
When the seat back is tilted by the reclining mechanism, the upper frame only tilts in a certain relationship, and the amount of mid-folding movement of the seat back is uniquely determined, and can be adjusted to suit the physique and preferences of the occupant, for example. It cannot be said that it is possible, and there is no degree of freedom in terms of operation. Such a problem can be easily understood since the lower frame constituting the seat bag and the link lever have a parallel link configuration. Furthermore, in the conventional structure described above, the bending operation is performed using a long link lever, but due to the long link lever, there is a problem in terms of rigidity. It is hoped that any possible measures will be taken.

The present invention was developed in view of these circumstances, and uses a link mechanism with a simple structure to properly and reliably link a center-folding type seat bag with a reclining mechanism to perform the required rotational displacement movement. At the same time, the bending motion can be adjusted, and a stable holding state can be easily and appropriately maintained when the seated person is seated in a relaxed posture, depending on the seated person's physique, sitting posture, etc., and the seat is comfortable. The object of the present invention is to obtain a seat device that can improve the sense of comfort.

[Means to solve the problem]

In order to meet such demands, the seat device according to the present invention is constructed by dividing the seat back frame of the seat back, which is tiltably supported by a reclining mechanism, into two halves, an upper part and a lower part. an upper frame and a lower frame which are rotatably supported by the reclining mechanism; and a link mechanism which is operated in accordance with the tilting operation of the reclining mechanism and rotates the upper frame relative to the lower frame. The mechanism includes a first link whose lower end is pivotally supported on the seat cushion side, a second link whose upper end is pivotally supported on the upper frame side, and one end between these links is the first link. At the upper end, there is a third link having a substantially L-shape, the other end of which is pivoted to the lower end of the second link. , the seat bag is supported so as to be movable and adjustable in the vertical direction.

[Effect]

According to the present invention, the upper and lower frames constituting the seat bag that can be tilted relative to the seat cushion are connected to the first link on the seat cushion side;
A reclining mechanism is provided by a link mechanism consisting of a second link on the upper frame side and a third link that connects these links and is supported so that the swinging fulcrum of the bent part can be moved and adjusted in the vertical direction of the seat back. It is possible to appropriately and reliably operate in conjunction with the movement of the seat back, and it is also possible to arbitrarily adjust the rotational displacement of the upper part of the seat back relative to the lower part of the seat back depending on the physique and sitting posture of the seated person. As a result, it is possible to appropriately obtain a seated posture in a relaxed state of the seated person, to ensure a stable seated state, and to improve the feeling of sitting comfort.

〔Example〕

1 to 4 show an embodiment of the seat device according to the present invention, and in these figures, the case where the seat device is a vehicle seat will be explained.

First, as is clear from FIG. 4, the vehicle seat, which is generally designated by the reference numeral 1, is composed of a seat cushion 2 and a seat back 3 that stands upright on the rear end side. It is divided into upper and lower sheet bodies 3a and 3b by a bent shaft support 4. In this embodiment, the upper and lower seat bodies 3a and 3b constituting the seat bag 3 are
A well-known headrest 5 is attached to the upper end of the upper seat body 3a, and the lower seat body 3b is composed of a base 7 and an arm 9 supported by a pivot shaft support 8 on the base 7, as is well-known. A case is shown in which the seat cushion 2 is connected and supported via the reclining mechanism 6. In this case, it goes without saying that the reclining mechanism 6 may be any one of a manually operated reclining device, a power reclining device using an electric motor, etc., and a both-side device having device parts on both sides of the seat.

Now, according to the present invention, as described above, the seat back is tiltably supported by the reclining mechanism 6, which is composed of the base 7 and the arm 9 rotatably supported on the base 7 on the rear end side of the seat cushion 2. 3, the first
As shown in the figure, an upper frame 10 and a lower frame 11 are constructed by dividing the seat bag frame of the seat bag 3 into upper and lower halves, and are relatively rotatably supported by a center-folded shaft support 4.
and a link mechanism 1 that is operated in conjunction with the tilting operation of the reclining mechanism 6 and rotates the upper frame 10 relative to the lower frame 11.
2, and this link mechanism 12 is connected to a first link 13 whose lower end is pivotally supported on the seat cushion 2 side, as shown in FIGS. 1 to 3.
a second link 14 whose upper end is pivotally supported on the lower end side of the upper frame 10;
3 and 14, the third link 15 has a substantially L-shape and is pivoted at one end at the upper end of the first link 13 and at the other end at the lower end of the second link 14. The seat bag 3 is characterized in that a swing fulcrum 16 formed at the bent portion of the link 15 of the seat bag 3 is supported so as to be movable and adjustable in the vertical direction of the seat bag 3. Note that 2a in FIG. 1 is a seat cushion frame, and 20 in FIG. 3 is a side frame constituting the lower frame 11 of the seat bag 3.

Furthermore, in this embodiment, the third link 1 mentioned above
A manually operated screw mechanism 21 is used to adjust the movement of the swing fulcrum 16 at 5. To explain this simply, 22 is a worm gear rotated by the operation knob 23, and 24 is the worm gear 22.
The lead screw has a wheel gear 25 that meshes with the lead screw, and a holder 28 on which the swing fulcrum 16 of the third link 15 is pivotally supported is screwed into the lead screw 24. As this holder 26 moves up and down with the rotation of the lead screw 24, the third link 15 is displaced as shown in FIG. The amount of tilting movement can be adjusted as appropriate. That is, when the third link 15, which is in the state shown by the solid line in FIG. As a result, the two links 13 and 14 are displaced, and the link length of the link mechanism 12 formed by the two links 13 and 14 changes. For example, as shown in FIG. 2, it is easy to understand that when the solid line state is displaced as shown by the imaginary line, the link length becomes relatively short.

Incidentally, the amount of tilting of the upper part of the seat back relative to the lower part of the seat back in such a configuration can be adjusted arbitrarily by appropriately selecting the lengths m and n of each arm in the third link 15 as shown in FIG. This can be set to

However, it will be easily understood that the present invention is not limited to this, and may be an electric type, for example, using an electric motor 30 as shown by the imaginary line in FIG.

According to the device of the present invention having such a configuration, the upper and lower frames 10 and 11 constituting the seat bag 3 which is tiltable with respect to the seat cushion 2
, the first link 13 on the seat cushion 2 side
and a second link 14 on the upper frame 10 side,
Connecting these and swinging fulcrum 1 of the bending part
6 and a third link 15 which is supported so as to be movable and adjustable in the vertical direction of the seat back 3, the reclining mechanism 6 can be appropriately and reliably operated in conjunction with the movement of the reclining mechanism 6. It is also possible to arbitrarily adjust the rotational displacement of the upper part of the seat back 3 relative to the lower part of the seat back according to the physique and sitting posture of the seated person, thereby obtaining an appropriate sitting posture for the seated person in a relaxed state. This ensures a stable seating condition and improves sitting comfort.

That is, when the seat back 3 is in the normal upright state, the gap between the back side of the occupant and the seat back surface is kept almost constant;
When the seat back is tilted toward the back side, a tensile force is applied to the upper frame 10 (seat back upper part 3a) by the first to third links 13, 14, and 15, and the upper frame 10 is moved to the lower frame 1.
In contrast to 1, the seat is tilted forward to solve the problem of the seat back upper part 3a being separated from the back side of the seated person. At this time, the upper frame 10 constituting the upper part of the seat back tilts in the opposite direction with respect to the lower frame 11 at a predetermined angle obtained by adjusting the length of the link system by the third link 15 described above. It turns out.

Note that the present invention is not limited to the structure of the embodiment described above, and the shape, structure, etc. of each part of the vehicle seat 1 as a seat device may be modified or changed as necessary, and various modifications may be made. I can think of it.

[Effect of idea]

As explained above, according to the seat device according to the present invention, the seat back can be tilted by the reclining mechanism for the upper frame and the lower frame of the seat back frame, which are relatively rotatably supported by the bent shaft support. A link mechanism that is operated in accordance with the above is comprised of a first link whose lower end is pivoted to the seat cushion side, a second link whose upper end is pivoted to the upper frame side, and one end of which is the first link. A third link having a substantially L-shape is provided at the upper end and the other end is pivotally supported by the lower end of the second link, and a rocker is formed at the bent portion of the third link. Since the dynamic fulcrum is supported so that it can be moved and adjusted in the vertical direction of the seat back, the upper and lower frames that make up the seat back that can be tilted relative to the seat cushion can be easily connected to the link mechanism, despite the simple and inexpensive structure. The reclining mechanism can be operated appropriately and reliably in conjunction with the movement of the reclining mechanism, and the position of the swinging fulcrum of the L-shaped third link in the vertical direction can adjust the physique of the seated person and the seating position. It is also possible to arbitrarily adjust the rotational displacement of the upper part of the seat back relative to the lower part of the seat back according to the seater's posture, etc., thereby ensuring a stable sitting position by appropriately obtaining a seated posture in which the occupant is in a relaxed state. It has various practical effects such as improving the feeling of sitting comfort.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing only the main structure of an embodiment of the seat device according to the present invention, FIG. FIG. 4 is a schematic side view of the seat for explaining the folded state of the seat bag. In the figure, 1...vehicle seat (seat device), 2
... Seat cushion, 3... Seat bag, 3
a, 3b... Upper and lower seat bodies, 4... Center folding shaft support, 6... Reclining mechanism, 7... Base, 8... Rotating shaft support, 9... Arm, 10...
Upper frame, 11...Lower frame, 12...
Link mechanism, 13, 14, 15...first, second,
Third link, 16... Swinging fulcrum, 21... Screw mechanism, 23... Manual operation knob, 30... Electric motor.

Claims (1)

[Scope of utility model registration request] In a seat device comprising a seat back that is tiltably supported by a reclining mechanism consisting of a base on the rear end side of the seat cushion and an arm rotatably supported by the reclining mechanism, the seat back frame of the seat back can be moved upwardly and downwardly. an upper frame and a lower frame that are configured to be divided into two parts and are relatively rotatably supported by a bent shaft support; The link mechanism includes a first link having a lower end pivotally supported on the seat cushion side, and an upper end portion pivoting on the upper frame side of the seat back frame. a second link on which is pivotally supported; one end between these two links is at the upper end of the first link;
a third link having a substantially L-shape, the other end of which is pivoted to the lower end of the second link, respectively;
A seat device characterized in that a swinging fulcrum formed at the bent portion of the third link is supported so as to be movable and adjustable in the vertical direction of the seat bag.