JPH10203220A - Seat device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat device for moving a head rest up and down associatively with both of the back and forth sliding motion of a seat and the rotational motion of a seat back against a seat cushion. SOLUTION: A seat device includes a rotational motion transmission mechanism 29, which is disposed on the rotational center axis of a seat back 3A against a seat cushion 2A between a pinion 12 engaged with a rack 11 provided in an upper rail and a drum 15 on which connecting members 16 and 17 for a heat rest up-and-down moving mechanism 28 are wound and capable of switching a transmission route for a rotational motion to the drum 15 associatively with the operation of a seat reclining mechanism 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat device having a mechanism for moving a headrest up and down in conjunction with a forward and backward sliding movement of a seat and a rotating movement of a seat back with respect to a seat cushion.

[0002]

2. Description of the Related Art Conventionally, as this type of sheet device, there is known a device disclosed in Japanese Utility Model Publication No. Hei.
197107 is known.

The former conventional device includes a seat having a seat cushion, a seat having a seat back rotatable with respect to the seat cushion, and a headrest capable of moving up and down with respect to the seat back, a lower rail fixed to the floor of a vehicle, and a lower rail. A seat front-back sliding mechanism having an upper rail slidably supported to support the seat and sliding the seat back and forth with respect to the floor of the vehicle, a headrest vertical movement mechanism for moving the headrest up and down with respect to the seatback, This is a seat device provided with an interlocking mechanism for interlocking a front-rear sliding mechanism and a headrest vertical moving mechanism. The interlocking mechanism of the seat device includes a biasing member that pushes the headrest upward, a first connecting member that is locked by the headrest and extends downward, and a first connecting member that is locked at one end of the first connecting member. A first pulley into which the member can be wound, a first gear rotating integrally with the first pulley, a second gear meshing with the first gear and acting as a speed reducer, and rotating integrally with the second gear; Second
A pulley and a second connecting member made of a wire having one end locked to the second pulley so as to be wound around the second pulley and the other end fixed to the floor. This allows
When the seat is slid forward, the wire as the second connecting member is pulled, and the movement is transmitted to the headrest via the second pulley, the second gear, the first gear, the first pulley, and the wire as the first connecting member. When the headrest moves downward against the urging member, and when the seat is slid backward, the wire as the second connecting member is loosened, and the headrest moves upward by the urging force of the urging member.

In the latter conventional apparatus, a seat having a seat cushion, a seat back rotatable with respect to the seat cushion, and a headrest movable up and down with respect to the seat back, and moving the head rest up and down with respect to the seat back. The seat device includes a headrest vertical movement mechanism, a reclining mechanism for rotating a seat back with respect to a seat cushion, and an interlocking mechanism for interlocking the reclining mechanism and the headrest vertical movement mechanism.
The interlocking mechanism of the seat device includes a wire whose upper end is rotatably connected to the seat cushion and whose lower end is connected to the headrest vertical movement mechanism. Thus, when the seat back is rotated forward with respect to the seat cushion, the wire is pulled and the headrest vertical movement mechanism is operated, so that the headrest moves downward.

[0005]

However, in the above-mentioned conventional device, the headrest moves up and down in conjunction with the sliding movement of the seat back and forth, but the headrest moves in conjunction with the pivoting movement of the seat back with respect to the seat cushion. In the latter conventional device, the headrest moves up and down in conjunction with the pivoting movement of the seat back with respect to the seat cushion, but the headrest moves in conjunction with the longitudinal sliding movement of the seat. Cannot move up and down.

As described above, in the former and latter conventional devices, it is difficult to move the headrest up and down in conjunction with both the back-and-forth sliding movement of the seat and the turning movement of the seat back with respect to the seat cushion.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a seat device in which a headrest moves up and down in conjunction with both a forward and backward sliding movement of a seat and a pivoting movement of a seat back with respect to a seat cushion. Things.

[0008]

Means taken to solve the above technical problems include a seat cushion, a seat back rotatable with respect to the seat cushion, and a headrest which is movable up and down with respect to the seat back. And a lower rail fixed to the floor of the vehicle, and an upper rail slidably supported by the lower rail and supporting the seat, and a seat front-back slide mechanism for sliding the seat back and forth with respect to the floor of the vehicle. A headrest vertical movement mechanism for moving the headrest up and down with respect to the seat back, a seat reclining mechanism for rotating the seat back with respect to the seat cushion, a rack provided on the lower rail, and the upper rail A pinion rotatably supported by the rack and meshing with the rack; A drum to which ON rotational motion is transmitted, a connecting member wound around the drum and linked to the headrest vertical movement mechanism, and a rotation center of the seat back with respect to the seat cushion between the pinion and the drum. A rotary motion transmitting mechanism disposed on a shaft and capable of switching a transmission path of the rotary motion to the drum in conjunction with the operation of the seat reclining mechanism.

According to this technical means, when the seat is slid in the front-back direction by operating the seat back-and-forth slide mechanism, the pinion is rotated by meshing with the rack, and the rotation of the pinion is transmitted via the rotation movement transmission mechanism. To the drum. Thereby, the drum rotates and the headrest vertical movement mechanism operates via the connecting member. When the seat back is rotated relative to the seat cushion by operating the seat reclining mechanism, the transmission path is switched, the rotary motion transmitting mechanism is rotated with respect to the pinion, and the rotary motion transmitting mechanism is rotated by the drum. It is transmitted to. Thereby, the drum rotates and the headrest vertical movement mechanism operates via the connecting member.

[0010] More preferably, said rotary motion transmitting mechanism comprises a first gear and a second gear fixed to said drum and arranged so that a rotation center axis thereof is substantially parallel to a rotation center axis of said pinion gear. A third gear which is arranged between the pinion gear and the first and second gears so as to be movable in the direction of the rotation axis thereof, meshes with the pinion gear, and meshes with and disengages with the first gear; And the second gear can be meshed and disengaged with the second gear, and when the first gear and the third gear mesh with each other, the meshing with the second gear is released and the A clutch gear mechanism linked to the seat reclining mechanism having a fourth gear meshing with the second gear when the first gear and the third gear are disengaged from each other; good.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a seat device according to the present invention will be described.

As shown in FIGS. 1 and 2, the sheet 1
Is composed of a cushion pan 2 which is a component of the seat cushion 2A (shown in FIG. 2), a seat back frame 3 which is a component of the seat back 3A (shown in FIG. 2), and a headrest 5 including a stay 4. The seat 1 is supported on the floor of the vehicle via a seat front-rear slide mechanism 6 described later.

The seat front-rear slide mechanism 6 is fixed to the floor of the vehicle and extends in the vehicle front-rear direction (the left-right direction in FIG. 2) and has a pair of lower rails 7 parallel to each other at a predetermined interval.
a, 7b and a pair of upper rails 8a, 8b slidably supported by the lower rails 7a, 7b, respectively.

The cushion pan 2 of the seat 1 is disposed between the upper rails 8a and 8b, and is fixed to the upper rails 8a and 8b on both sides. The seat back frame 3 of the seat 1 is arranged between the upper rails 8a and 8b, and the lower arms 9 fixed to the rear portions of the upper rails 8a and 8b with the support portions 3a and 3b on both sides thereof.
1 and 10, a pair of shafts 92 and 13 (a lower arm and a shaft on one side are not shown in FIGS. 1 and 2 but are shown in FIG. 3 because they are components of the reclining unit 9 described later). It is supported rotatably through the. As a result, the seat back 3A is arranged upright at the rear of the seat cushion 2A and is rotatable with respect to the seat cushion 2A so as to change the inclination angle. The headrest 5 is provided on the upper part of the seat back frame 3 via the stay 4 in the vehicle vertical direction (the vertical direction shown in FIGS. 1 and 2).
It is supported movably. As a result, the headrest 5 can freely move up and down with respect to the seat back 3A.
As described above, since the seat back frame 3 on which the seat cushion pan 2 and the headrest 5 are supported is supported by the upper rails 8a, 8b, as a result, the seat 1 is moved by the sliding of the upper rails 8a, 8b on the lower rails 7a, 7b. It becomes slidable in the vehicle front-rear direction with respect to the floor of the vehicle.

On one side of the seat 1 (the side of the column 3a), the seat back frame 3 is connected to one upper rail 8a.
A well-known reclining unit 9 is disposed around a shaft 92 which supports the seat back 3A, thereby regulating the rotation of the seat back frame 3 and adjusting and holding the seat back 3A at a predetermined angle with respect to the seat cushion 2A. I can do it. This reclining unit 9
Has a lower arm 91 fixed to the upper rail 8a and an upper arm 93 fixed to the seat back frame 3, as shown in FIG.
Is rotatably supported by a lower arm 91 by a shaft 92. A well-known lock mechanism (not shown) is provided between the upper arm 93 and the lower arm 91 to control and release the rotation of the upper arm 93 with respect to the lower arm 91 via the shaft 92 by operating the operation lever 94. Has been established.

A guide rail 18 extending in the vertical direction of the vehicle is fixed to the center of the seat back frame 3, and a move 19 is slidably mounted on the guide rail 18. Move 19 has headrest 5
Are connected. These guide rails 18
And the headrest vertical movement mechanism 28 by the move 19
Is configured.

As shown in FIGS. 1, 2 and 4, on the other side (the column 3b side) of the seat 1, the other lower rail 7b is provided with a rack extending in the rail longitudinal direction (vehicle longitudinal direction). 11 is fixed, and a pinion 12 meshing with the rack 11 is provided on the other upper rail 8b.
1 rotatably supported. The first gear 14 and the second gear 22 are provided on the support 3 b of the seat back frame 3.
And the drum 15 are supported by a pin 32 so as to rotate integrally with each other. The first gear 14 and the second gear 22
It can be linked to the pinion 12 via a switching mechanism 24 described later. The first gear 14 has a second gear 22
It has a smaller diameter. Two wires 16 and 17 are wound around the drum 15 in opposite directions.

A plurality of pulleys 20, 21 are rotatably supported on the seat back frame 3. Wire 1
One end of 7 is locked to the drum 15, and the other end is wired to a plurality of pulleys 20 and locked to the move 19. Also, one end of the wire 16 is locked to the drum 15,
The other end is routed to a plurality of pulleys 21 to move 1
9.

The shaft 13 is connected to the seat back frame 3.
The third gear 23 and the fourth gear 24 are supported so as to rotate integrally and move in the axial direction. The third gear 23 meshes with the first gear 14, and is disengaged from the first gear 14 by moving in the axial direction. The fourth gear 24 meshes with the second gear 22 and the pinion gear 12, and is disengaged from the second gear 22 by moving in the axial direction. The fourth
The gear 24 and the pinion gear 12 are always in meshing relationship even if the fourth gear 24 moves in the axial direction.
Each axial thickness is set (pinion gear 12
Is more than twice the thickness of the fourth gear 24). A spring 25 is provided around the shaft 13, and the shaft 13 receives the urging force of the spring 25 so that the first
The gear 14 and the third gear 23 are urged to move in one axial direction (leftward in FIG. 1) so that the second gear 22 and the fourth gear 24 are disengaged from each other. I have. or,
A link 26 rotatably supported by the seat back frame 3 is connected to the shaft 13. The link 26 is connected to an arm 94 a of an operation lever 94 of the reclining unit 9 via a wire 27. (FIG. 3). The first gear 14, the second gear 22, the third gear 23, the fourth gear 24, and the shaft 13 thus configured
Of the shaft 13, the third gear 23, the fourth gear 24, and the spring 25.
Constitutes a clutch gear mechanism in the rotation transmission mechanism 29.

Next, the operation will be described.

The shaft 13 as shown in FIG. 4 is urged to move by a spring 25 so that the first gear 14 and the third gear 2 are moved.
3, in the normal state in which the second gear 22 and the fourth gear 24 are disengaged, as shown in FIG.
When the upper rails 8a, 8b are moved forward with respect to the lower rails 7a, 7b, that is, when the seat 1 is slid forward by the driving force of a motor or a motor,
The pinion 12 moves relatively forward with respect to the rack 13 (in FIG. 4, the rack 13 is moved as shown by a dashed line), and the pinion 12 rotates. The meshing fourth gear 24 rotates. The rotation of the fourth gear 24 is transmitted to the third gear 23 via the shaft 13, reduced by the engagement of the third gear 23 and the first gear 14, and transmitted to the first gear 14. As a result, the drum 15 that rotates integrally with the first gear 14 rotates, so that the wire 16 is sent out from the drum 15 and the wire 17 is wound around the drum 15. As a result, Move 19
Slides downward along the guide rail 18, and the headrest 5 moves downward as indicated by a dashed line in FIG. Conversely, when the upper rail 8 is moved rearward, that is, when the seat 1 is slid backward, the pinion 12, the fourth gear 24, the shaft 13, the first gear 14, and the drum 15 rotate in the opposite direction to the above. , Wire 17
Is sent out from the drum 15 and the wire 16 is wound around the drum 15. Thereby, the move 19 slides upward along the rail 18, and the headrest 5 moves upward via the stay 4.

As described above, when the seat 1 slides in the vehicle front-rear direction with respect to the floor of the vehicle, the headrest 3 moves up and down in the vehicle vertical direction.

The operating lever 94 of the reclining unit 9 is operated to move the seat back 3A to the seat cushion 2.
When the seat back 3A is turned forward and the seat back 3A is tilted forward, the shaft 1 via the cable 27 and the link 26 interlocks with this operation (operation of the operation lever 94).
3 moves leftward in FIG. 1 against the urging force of the spring 25. As a result, as shown in FIG.
The gear 24 and the first gear 14 and the third gear 23 are disengaged. At this time, since the fourth gear 24 does not rotate due to meshing with the pinion gear 12, the second gear 22 supported by the seat back frame 3 moves with the rotation of the seat back 3A.
It will revolve while rotating around. This allows
The drum 15 that rotates integrally with the second gear 22 rotates, and as a result,
The wire 16 is wound by the drum 15 and the wire 17 is sent out by the drum 15, and the headrest 5 is lowered accordingly. Conversely, when the seat back 3A is raised, the second gear 22 rotates and revolves in the opposite manner as described above, so that the wire 17 is sent out from the drum 15 and the wire 16 is wound around the drum 15. As a result, the move 19 slides upward along the rail 18 and the stay 4
The headrest 5 moves upward via. The rotation of the drum 15 accompanying the rotation of the seat back is controlled by the first gear 14.
Due to the difference in the number of teeth between the headrest 5 and the second gear 22, the rotation becomes faster than the rotation of the drum 15 caused by the sliding of the seat 1, and the amount of vertical movement of the headrest 5 increases.

As described above, as the seat back 3A rotates with respect to the seat cushion 1, the headrest 5 moves up and down in the vehicle vertical direction.

[0025]

According to the present invention, a rotary motion transmitting mechanism capable of switching the transmission path of the rotary motion to the drum in conjunction with the operation of the seat reclining mechanism is provided. The vertical movement and the vertical movement of the headrest caused by the rotational movement of the seat back with respect to the seat cushion can be made compatible with a simple structure.

Further, according to the present invention, since the rotary motion transmitting mechanism is constituted by the first to fourth gears, the amount of vertical movement of the headrest caused by the forward and backward sliding motion of the seat can be determined by setting the gear ratio of each gear. It is possible to arbitrarily and easily set the amount of vertical movement of the headrest associated with the rotational movement of the seat back relative to the seat cushion.

[Brief description of the drawings]

FIG. 1 is a front view of a seat device according to the present invention.

FIG. 2 is a side view of the seat device according to the present invention.

FIG. 3 is a front view showing a seat reclining mechanism of the seat device according to the present invention.

FIG. 4 is a front view showing a rotational motion transmission mechanism of the seat device according to the present invention.

FIG. 5 is a front view corresponding to FIG. 4, showing the operation of the rotational motion transmission mechanism of the seat device according to the present invention.

FIG. 6 is a side view corresponding to FIG. 2, showing an operation of the seat device according to the present invention when the seat is slid forward and backward.

FIG. 7 is a side view corresponding to FIG. 2, showing an operation of the seat device according to the present invention when the seat back rotates.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seat 5 Headrest 6 Seat front and rear slide mechanism 7 Lower rail 8 Upper rail 11 Rack 12 Pinion 13 Shaft (clutch gear mechanism) 14 First gear 15 Drum 16, 17 Wire (connection member) 22 Second gear 23 Third gear (Clutch gear) Mechanism) 24 fourth gear (clutch gear mechanism) 25 spring (clutch gear mechanism) 28 headrest vertical movement mechanism 29 rotational motion transmission mechanism 2A seat cushion 3A seat back

Continuation of front page (72) Inventor Satoshi Kawaguchi 12 Aisin Light Metal Co., Ltd. at 12 Nagoe, Shinminato City, Toyama Prefecture

Claims (2)

[Claims] A seat having a seat cushion, a seat back rotatable with respect to the seat cushion, and a headrest movable vertically with respect to the seat back;
A lower rail fixed to the floor of the vehicle, an upper rail slidably supported by the lower rail and supporting the seat, a seat front-back sliding mechanism for sliding the seat back and forth with respect to the floor of the vehicle, and the headrest. A headrest vertical movement mechanism for moving the seatback up and down, a seat reclining mechanism for rotating the seatback with respect to the seat cushion, a rack provided on the lower rail, and a rotatably supported by the upper rail. A pinion meshed with the rack, and a drum to which the rotational motion of the pinion is transmitted;
A connection member wound around the drum and linked to the headrest vertical movement mechanism; and a connection member disposed between the pinion and the drum on a rotation center axis of the seatback with respect to the seat cushion. A rotary motion transmitting mechanism capable of switching a transmission path of the rotary motion to the drum in conjunction with the operation. 2. The first and second gears, wherein the rotational motion transmitting mechanism is fixed to the drum, and a rotation center axis of the first and second gears is arranged substantially parallel to a rotation center axis of the pinion gear. A third gear and a third gear which are arranged between the first and second gears so as to be movable in the direction of the rotation axis thereof, mesh with the pinion gear, and mesh with and disengage with the first gear; And the second gear can be meshed and disengaged with the second gear. When the first gear is meshed with the third gear, the meshing with the second gear is released and the first gear is disengaged. And a clutch gear mechanism linked to the seat reclining mechanism having a fourth gear engaged with the second gear when the third gear is disengaged from the third gear.
The sheet device according to the above.