JPH05278507A - Seat for vehicle - Google Patents

Abstract

PURPOSE:To provide a vehicle seat whose lift device can function only when an occupant seats at a normal seat position on a seat cushion. CONSTITUTION:A pressure sensor 15 to detect the seat position of an occupant on a seat cushion is arranged on the occupant seat face 12B of the seat cushion 12 of a vehicle seat 10. The pressure sensors 15 are severally arranged at intersection points A1, A2,...E4 between the axes of abscissa A, B, C, D, E and the axes of ordinate 1, 2, 3, 4. The pressure sensor 15 is connected to a at a normal seat position or not on the result of detection carried out by each pressure sensor 15. In addition, the control circuit 21 is connected to a lock solenoid 17, and applys an electric current to the lock solenoid 17 when the occupant is judged to be seated at the normal seat position for making the oscillation of a pendulum serving as the deceleration sensor of a lift device possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat,
In particular, the present invention relates to a vehicle seat that raises a front end portion of a seat cushion when the vehicle suddenly decelerates.

[0002]

2. Description of the Related Art Conventionally, when a vehicle suddenly decelerates, the occupant may move forward due to inertia and the waist of the occupant may not be properly restrained by the webbing. To prevent this, the vehicle suddenly decelerates. In this case, there is known a vehicle seat that instantly raises the front end portion of the seat cushion to reduce the amount of forward displacement of an occupant.

As an example of this vehicle seat, there is JP-A-62-20736. As shown in FIG. 11, the vehicle seat 70 includes a lift mechanism 74 that raises the front end portion 72A of the seat cushion 72 when the vehicle suddenly decelerates.

As shown in FIG. 12, this lift mechanism 7
The lift member 76 of No. 4 has a shaft 84 provided at the upper end of a bracket 82 whose rear end 76A is erected on a support plate 80.
Is pivotally supported on the shaft 84.
It is possible to swing 0 to 70 degrees.

Further, a slender through hole 85 is formed in the front-rear direction in the front part of the top plate 76B of the lift member 76 and in the center part in the width direction, in front of the shaft support part of the lift member 76.
The spring receiving rod 88 is swingably attached to the bracket 86 of the support plate 80 immediately below the rear portion of the through hole 85.

A spring receiving portion 88A is formed in the vicinity of a lower portion of the through hole 85 of the spring receiving rod 88, and a spring receiving plate 90 which can be inserted and removed from the front is detached upward from the spring receiving portion 88A. It is locked so that it does not exist. A compression coil spring 92 is provided on the spring receiving rod 88. The compression coil spring 92 has a lower end portion supported by a support plate 80 and an upper end portion supported by a spring reception plate 90.

A solenoid 94 is provided in front of the spring receiving plate 90.
Is arranged, and the operating shaft 94A of the solenoid 94 is connected to the spring receiving plate 90. When the solenoid 94 is energized, the spring receiving plate 90 moves forward integrally with the operating shaft 94A, and the compression is performed. The spring force of the coil spring 92 acts on the lift member 76 to cause the front end portion 72A of the seat cushion 72.
Is designed to rise.

A sensor for energizing the solenoid 94 uses, for example, a limit switch 96 incorporated in the back of the bumper.

[0009]

However, in this vehicle seat 70, the occupant does not have the seat cushion 7.
When the vehicle is not seated at the second regular seating position, for example, when seated on the front end portion 72A of the seat cushion 72, the lift mechanism 74 may operate and the front end portion 72A of the seat cushion 72 may rise. In this case, the sitting posture of the occupant becomes unstable.

In view of the above facts, an object of the present invention is to obtain a vehicle seat in which a lift device can be operated only when an occupant is seated at a regular seating position on a seat cushion.

[0011]

A vehicle seat according to claim 1 of the present invention is a vehicle seat provided with a lift device for raising a front end portion of the seat cushion when the vehicle is suddenly decelerated, and the occupant of the seat cushion. A seating position detecting means arranged on the seating surface for detecting the seating position of the occupant on the seat cushion, and the lift device is operated only when the occupant is seated at the regular seating position based on the detection result from the seating position detecting means. It is characterized in that it is provided with a lifting device locking means that enables it.

[0012]

In the vehicle seat according to the first aspect of the present invention, when the occupant sits on the seat cushion, the seating position is detected by the seating position detecting means. The lift device lock means enables the lift device only when the occupant is seated at the regular seating position based on the detection result from the seating position detection means.

Therefore, when the occupant is not seated at the normal seating position of the seat cushion, for example, when seated at the front end portion of the seat cushion, the lift device does not operate during the sudden deceleration of the vehicle and the seat cushion The front end does not rise. Therefore, the sitting posture of the occupant does not become unstable.

Further, when the occupant is seated at the regular seating position of the seat cushion, the lift device is activated at the time of sudden deceleration of the vehicle, and the front end portion of the seat cushion is raised to reduce the displacement amount of the occupant to the front. can do.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the vehicle seat of the present invention will be described with reference to FIGS.

In the figure, the arrow FR indicates the front direction of the vehicle body, and the arrow UP indicates the upward direction of the vehicle body. As shown in FIG. 1, a vehicle seat 10 according to the present embodiment includes a seat cushion 12 and a seat back 14, and the seat cushion 1
2 is capable of swinging in the vertical direction with the vicinity of the rear end portion as the center of rotation. Occupant seating surface 12B of the seat cushion 12
A pressure sensor 15 as a seating position detecting means for detecting the seating position of the occupant on the seat cushion is arranged in the vehicle.

As shown in FIG. 2, these pressure sensors 15 are arranged on the occupant seating surface 12B of the seat cushion 12 in the front-rear direction (vertical direction in FIG. 2) at predetermined intervals in the left-right direction (left-right direction in FIG. 2). A plurality of transverse axes traversing, for example transverse axis A,
B, C, D, E and the occupant seating surface 12B in the left-right direction (see FIG.
A plurality of vertical axes that cross the front-back direction (vertical direction in FIG. 2) at predetermined intervals in the horizontal direction, for example, the vertical axes 1, 2, 3,
4 is embedded in the seat cushion epidermis at positions A1, A2, ... E4, E5.

These pressure sensors 15 are connected to a control circuit 21 which constitutes a part of the lift device locking means. The control circuit 21 is provided with a microcomputer, and judges whether or not the occupant is seated at the regular seating position based on the detection result from each pressure sensor 15. For example, from the voltage values of the five pressure sensors 15 arranged on each of the horizontal axes A, B, C, D, and E, the horizontal axis A,
Calculate the average pressure value for each of B, C, D, E, and compare them, and if the average pressure value of the horizontal axes D, E is higher than the average pressure value of the horizontal axes A, B, C, The occupant is determined to be seated at the regular seating position.

Further, the control circuit 21 is connected to a lock solenoid 17 which constitutes another part of the lifting device locking means, and when it is judged that the occupant is seated at the regular seating position, the lock solenoid 17 is connected. Is designed to be energized.

As shown in FIG. 3, in the non-energized state, the plunger 17A of the lock solenoid 17 is in contact with the pendulum 44 which constitutes the deceleration sensor of the lift device.
4 is prevented from swinging forward (in the direction of arrow H in FIG. 3).

On the other hand, as shown in FIG. 4, when the lock solenoid 17 is energized, the plunger 17
A is pulled into the solenoid main body against the urging force of the coil spring 19, and the pendulum 44 can be swung forward (in the direction of arrow H in FIG. 4).

Next, the lift device 19 of the vehicle seat 10 of this embodiment will be described. As shown in FIG. 5, a bracket 16 is provided at the lower part of the front end in the vehicle front-rear direction of the side wall 13A of the cushion panel 13 that forms the skeleton of the seat cushion 12. The bracket 16 has an L-shaped cross-section when viewed from the front-rear direction of the vehicle body, and one horizontal piece 16A, which is a bent piece, is a cushion panel 13.
Is fixed to the lower surface 13B of the. Also, the bracket 16
A pin 18 is erected on the vertical piece 16B, which is the other bent piece, toward the outer side in the vehicle width direction.

One end portion 20A of the arm 20 is connected to the pin 18 in the clockwise direction of FIG. 6 (direction of arrow A in FIG. 6) and the counterclockwise direction of FIG. 6 (direction of arrow B in FIG. 6). It is pivotally supported.

As shown in FIG. 5, a shaft 22 is arranged on the lower front side of the bracket 16 along the vehicle width direction. Both ends 22A of the shaft 22 are formed by the cushion panel 1
An inner wall portion 24 formed upward at a lower portion of a front end of a bracket 24 that is disposed at a slightly outer side in the vehicle width direction of No. 3
It is rotatably supported by A. Also, the end 2 of the shaft 22
In the vicinity of 2A, a substantially fan-shaped large gear 26 is fixed, and the large gear 26 is integrally united with the shaft 22 around the shaft 22 in the clockwise direction of FIG. 6 (direction of arrow C in FIG. 6). And in the counterclockwise direction of FIG. 6 (direction of arrow D in FIG. 6).

As shown in FIG. 6, a pin 28 is provided upright toward the inner side in the vehicle width direction on the outer peripheral side of the clockwise side edge 26A of the large gear 26. The other end 20B of the arm 20 can swing on the pin 28 in the clockwise direction of FIG. 6 (direction of arrow E in FIG. 6) and the counterclockwise direction of FIG. 6 (direction of arrow F in FIG. 6). Is supported by.

Therefore, when the large gear 26 swings integrally with the shaft 22 around the shaft 22 in the direction of arrow D in FIG. 6, the arm 20 moves around the pin 28 in the direction of arrow E in FIG. Ascends and rises. Accordingly, the bracket 1 pivotally supported by the end portion 20A of the arm 20 is swingable.
6 moves substantially above the vehicle body (in the direction of arrow G in FIG. 6), and
The front end portion 12A of the seat cushion 12 shown in FIG.

As shown in FIG. 5, a pin 30 is provided upright toward the inner side in the vehicle width direction at the lower portion of the front end of the outer wall portion 24B of the bracket 24. The pin 30 has a torsion spring 32. Is wrapped around. Inner end 3 of torsion spring 32
2A is fixed to the pin 30, and the outer end portion 32B of the torsion spring 32 is a side edge portion 2 of the large gear 26 in the clockwise direction.
The outer peripheral side portion of 6A is engaged with a flange portion 34 that is provided upright outward in the vehicle width direction. Therefore, the large gear 26 is urged substantially upward (in the direction of arrow D in FIG. 6) by the torsion spring 32.

A tooth portion 26 provided on the outer peripheral portion of the large gear 26
A rotary shaft 36 is arranged at a portion facing B in the vehicle width direction.

As shown in FIG. 7, the upper portion of the bracket 24 has a U-shaped cross section with the opening facing downward, and the rotating shaft 36 is supported by the outer wall portion 24B and the inner wall portion 24C. A small gear 38 is spline-coupled to a substantially central portion of the rotary shaft 36, and the small gear 38 is a tooth portion 2 of the large gear 26.
6B and the position where the engagement with the tooth portion 26B of the large gear 26 is released. One end 36 </ b> A of the rotary shaft 36 has an outer wall portion 2 of the bracket 24.
It extends from 4B to the outside in the vehicle width direction, and a dial 40 is fixed to the tip portion.

A resistor 42 is fixed coaxially to the rotary shaft 36 on the surface of the outer wall portion 24B of the bracket 24 on the dial 40 side, and the rotation of the rotary shaft 36 is suppressed by the resistor 42. That is, when the small gear 38 is engaged with the tooth portion 26B of the large gear 26, the load of the resistor 42 prevents the large gear 26 from swinging upward due to the biasing force of the torsion spring 32. There is.

As shown in FIG. 3, a pendulum 44 is provided inside the small gear 38 of the rotary shaft 36 in the vehicle width direction. The pendulum 44 is supported by the inner wall portion 24C of the bracket 24 by a pin 46 at a substantially central portion in the longitudinal direction, and is in the arrow H direction in FIG. 3 and the vehicle rear side (arrow J direction in FIG. 4).
It is possible to swing to and. The upper end portion of the pendulum 44 is a hook portion 44A, which engages with the rotating shaft 36 and abuts against the inner side surface of the small gear 38 in the vehicle width direction.

An engagement release bar 48 is provided on the outer side of the small gear 38 of the rotary shaft 36 in the vehicle width direction. A lower end portion 48A of the engagement release bar 48 is bifurcated and engages with the rotating shaft 36, and abuts on the outer side portion of the small gear 38 in the vehicle width direction.

As shown in FIG. 5, the disengagement bar 48
Is a U-shaped bracket 52 whose substantially central portion in the longitudinal direction is fixed to the inner wall portion 24C of the bracket 24 by a pin 50.
The lower end portion 48A of the engagement release bar 48 moves along the rotation shaft 36 and moves the small gear 38 inward in the vehicle width direction (direction of arrow K in FIG. 3). It is like this.

A compression coil spring 54 is inserted between the upper end portion 48B of the engagement release bar 48 and the inner wall portion 24C of the bracket 24.
Urges the upper end portion 48B of the engagement release bar 48 inward in the vehicle width direction (direction of arrow L in FIG. 3).

Therefore, the lower end portion 48A of the engagement releasing bar 48 is moved by the urging force of the compression coil spring 54 so that the pinion 38
3 is pressed in the direction of arrow K in FIG. 3, and the hook portion 44A of the pendulum 44 prevents the small gear 38 from moving in the direction of arrow K in FIG.

As shown in FIG. 5, a reverse rotation preventing stopper 56 is provided on the rotary shaft 36 in front of the vehicle body (direction of arrow H in FIG. 4).
And the rear of the vehicle body (in the direction of arrow 4 in FIG. 3) are swingably supported. The lower end portion of the reverse rotation prevention stopper 56 is a hook portion 56A. In the vicinity of the front of the hook portion 56A of the reverse rotation prevention stopper 56, a serrated engagement claw 58 is provided. The engaging claw 58 is provided on the tooth portion 2 of the large gear 26.
6B is formed integrally with the tooth portion 26B on the outer side in the vehicle width direction of 6B, and when the reverse rotation prevention stopper 56 is decelerated by a predetermined value or more, the reverse rotation prevention stopper 56 swings forward of the vehicle body. Then, the hook portion 56A of the reverse rotation prevention stopper 56
And the engaging claw 58 are engaged with each other to prevent the large gear 26 from swinging downward.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG. In the vehicle seat 10 of the present embodiment, when an occupant sits on the occupant seating surface 12B of the seat cushion 12, each pressure sensor 15 is pressed by the occupant's hips and thighs, and the pressure value of each pressure sensor 15 is reached. The (voltage value) is read into the control circuit 21 (step 10
0).

The control circuit 21 reads each horizontal axis A,
Five pressure sensors 15 arranged on B, C, D and E respectively
The average pressure value for each of the horizontal axes A, B, C, D and E is calculated from the voltage value of (step 102) and these are compared (step 104).

As a result, when the average pressure value on the horizontal axes D and E is not higher than the average pressure value on the horizontal axes A, B and C,
The control circuit 21 determines that the occupant is not seated at the regular seating position and does not energize the lock solenoid 17 (step 106). As a result, as shown in FIG. 3, the plunger 17A of the lock solenoid 17 is locked by the lift device 1.
9, the lift device 19 does not operate.

Therefore, when the occupant is not seated at the normal seating position of the seat cushion 12, for example, when seated at the front end portion 12A of the seat cushion 12, the lift device 19 does not operate during the rapid deceleration of the vehicle. The front end portion 12A of the seat cushion 12 does not rise. Therefore, the sitting posture of the occupant does not become unstable.

On the other hand, when the average pressure value on the horizontal axes D, E is higher than the average pressure value on the horizontal axes A, B, C, the control circuit 21 indicates that the occupant is seated at the normal seating position. Then, the lock solenoid 17 is energized (step 10
8). As a result, as shown in FIG. 4, the plunger 17A of the lock solenoid 17 is pulled into the solenoid body against the biasing force of the coil spring 19, and the pendulum 44 can be swung in the direction of arrow H in FIG. ..

Therefore, when the vehicle suddenly decelerates and a deceleration of a predetermined value or more acts on the pendulum 44, the pendulum 44 moves to the position shown in FIG.
The hook portion 44A of the pendulum 44 is disengaged from the rotary shaft 36 by swinging in the arrow H direction. As a result, the compression coil spring 5
By the urging force of 4, the lower end portion 48A of the engagement release bar 48
Moves the small gear 38 in the direction of arrow K in FIG.
8 is disengaged from the tooth portion 26B of the large gear 26. When the engagement of the large gear 26 with the small gear 38 is released, the large gear 26 is instantly swung in the direction of arrow D in FIG. 6 by the biasing force of the torsion spring 32. As a result, the arm 20 swings about the pin 28 in the direction of arrow E in FIG. 6 and ascends, and the bracket 16 pivotally supported by the end 20A of the arm 20 swings substantially above the vehicle body (see FIG. 6). In the direction of arrow G), and the front end portion 12A of the seat cushion 12 rises. Therefore, the amount of forward displacement of the occupant can be reduced.

On the other hand, when the occupant adjusts the driving posture, by rotating the dial 40, the rotary shaft 36 rotates, the small gear 38 rotates integrally, and the large gear 26 of FIG. It swings in the direction of arrow D or in the direction of arrow C in FIG.

For example, when the large gear 26 swings in the direction of arrow D in FIG. 6, the arm 20 swings in the direction of arrow E in FIG. As a result, the bracket 16 pivotally supported by the end portion 20A of the arm 20 moves substantially above the vehicle body (in the direction of arrow 6 in FIG. 5), and the front end portion 12A of the seat cushion 12 rises.

When the large gear 26 swings in the direction of arrow C in FIG. 6, the arm 20 swings in the direction of arrow F in FIG. As a result, the bracket 16 pivotally supported by the end portion 20A of the arm 20 moves substantially below the vehicle body, and the front end portion 12A of the seat cushion 12 descends.

Next, a second embodiment of the vehicle seat of the present invention will be described with reference to FIGS.

Regarding the same members as in the first embodiment,
The same reference numerals are given and the description thereof is omitted.

As shown in FIG. 9, the vehicle seat 10 according to the present embodiment has an occupant seating surface 12B of a seat cushion 12.
A wire 60 forming a part of the seating position detecting means for detecting the seating position of the occupant is arranged in the. These wires 60 are arranged across the occupant seating surface 12B of the seat cushion 12 at predetermined intervals in the front-rear direction and in the left-right direction. For example, the wires 60A, 60B, 60C, 60 are provided.
D and 60E.

As shown in FIG. 10, each wire 60A,
60B, 60C, 60D, and 60E are embedded in the seat cushion skin, one end is fixed to the upper end of the side wall 13A of the cushion panel 13, and the other end is the other seating position detecting means. Each of them is connected to a potentiometer 62 forming a part. For this reason,
When the occupant is seated on the occupant seating surface 12B, the wires 60A, 60B, 60 are deformed by the bending of the occupant seating surface 12B.
C, 60D, and 60E are bent as shown by the imaginary line in FIG. 10, and the wires 60A, 60B, 60C, 60D, and 60E are pulled in the direction of arrow S in FIG. It is converted and detected.

Each potentiometer 62 is connected to a control circuit 64 which constitutes a part of the lifting device locking means. The control circuit 64 is provided with a microcomputer, and determines whether or not the occupant is seated at the normal seating position based on the detection result from each potentiometer 62. For example, each potentiometer 6
The voltage value of the potentiometer 62 connected to the wires 60D and 60E is compared with the voltage value of the wire 60D.
Potentiometer 6 connected to A, 60B, 60C
When the voltage value is higher than the voltage value of 2, it is determined that the occupant is seated at the regular seating position.

The control circuit 64 is connected to the lock solenoid 17 which constitutes another part of the lift device lock means, and energizes the lock solenoid 17 when it is determined that the occupant is seated in the normal seating position. It is supposed to do. Therefore, also in this embodiment, the same effect as that of the first embodiment can be obtained.

[0052]

The vehicle seat of the present invention is based on the seating position detecting means arranged on the seating surface of the seat cushion and for detecting the seating position of the passenger on the seat cushion, and the detection result from the seating position detecting means. The lift device lock means that enables the lift device to operate only when the occupant is seated at the regular seating position is provided. Therefore, the lift device is provided only when the occupant is seated at the regular seating position on the seat cushion. It is possible to prevent the occupant's sitting posture from becoming unstable by operating the lift device when the occupant is not sitting at the regular seating position on the seat cushion. Have.

[Brief description of drawings]

FIG. 1 is a perspective view of a vehicle seat according to a first embodiment of the present invention as seen obliquely from the front of a vehicle body.

FIG. 2 is a plan view showing a seat cushion of the vehicle seat of the first embodiment of the present invention.

FIG. 3 is a perspective view of the vicinity of a pendulum of the vehicle seat lift device according to the first embodiment of the present invention, as viewed from the rear inside of the vehicle body.

FIG. 4 is an operation explanatory view showing the vicinity of a pendulum of the vehicle seat lift device according to the first embodiment of the present invention.

FIG. 5 is a perspective view of the lift device for a vehicle seat according to the first embodiment of the present invention, as seen from the diagonally front outside of the vehicle body.

FIG. 6 is an operation explanatory view showing the vicinity of a large gear of the vehicle seat lift device according to the first embodiment of the present invention.

FIG. 7 is a front view of the vehicle seat lift device according to the first embodiment of the present invention as seen from the front of the vehicle body.

FIG. 8 is a flowchart showing the control of the lock solenoid of the vehicle seat of the first embodiment of the present invention.

FIG. 9 is a perspective view of a vehicle seat according to a second embodiment of the present invention as seen obliquely from the front of the vehicle body.

FIG. 10 is a sectional view of a seat cushion of a vehicle seat according to a second embodiment of the present invention as seen from the front of the vehicle body.

FIG. 11 is a side view showing a conventional vehicle seat.

FIG. 12 is a side view showing a conventional vehicle seat lift device.

[Explanation of symbols]

 10 Vehicle Seat 12 Seat Cushion 12A Front End 12B Occupant Seating Surface 15 Pressure Sensor (Seating Position Detection Means) 17 Lock Solenoid (Lift Device Locking Means) 19 Lifting Device 21 Control Circuit (Lifting Device Locking Means) 60 Wire (Seating Position Detection) Means) 62 potentiometer (seating position detecting means) 64 control circuit (lift device locking means)

Claims (1)

[Claims] 1. A seat for a vehicle, comprising a lift device for raising a front end portion of a seat cushion during sudden deceleration of a vehicle, the seat being disposed on a passenger seating surface of the seat cushion and detecting a seating position of the passenger on the seat cushion. It is characterized by further comprising position detecting means, and lift device locking means for enabling the lift device to operate only when an occupant is seated in a normal sitting position based on the detection result from the seating position detecting means. Vehicle seat.