JP2000052825A - Seat with flip-up headrest - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve operability at the time of rising and falling down without flapping in the time of traveling, and stably hold a headrest to a rising position and a falling down position. SOLUTION: A seat 1 with a rising and falling type headrest is provided with a lock mechanism 8 for locking a headrest 3 provided freely to raise and fall down on a seat back only at a rising position and a falling down position, an energization means 9 for energizing the headrest 3 toward the rising position, and a releasing mechanism 10 for releasing a locking state of the headrest 3 at a falling down position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat provided with a tiltable headrest.

[0002]

2. Description of the Related Art A headrest is mounted on an upper portion of a seat back constituting a seat. The headrest is
Generally, the position of the seat back can be moved in the front-rear direction in consideration of the posture and the body shape of the seated person. In particular, the rear seat employs a structure in which the headrest can be removed from the seat back when the seat is not used, in consideration of the rear view from the driver. However, such a task of removing the headrest one by one was very troublesome. Therefore, 6-2
In Japanese Patent No. 9107, a headrest is provided on a seat back which is provided on a seat cushion so as to be able to be turned upside down and held in an upright state by a holding mechanism. A seat has been proposed in which the holding mechanism is released by pulling a wire by tilting the headrest and pulling a wire, and the seatback is tilted together in conjunction with the tilting operation of the headrest.

[0003]

SUMMARY OF THE INVENTION
In the seat described in Japanese Patent No. 29107, since the headrest is connected to the holding mechanism via the wire, the headrest is pulled by the wire and held at the upright position only when the seatback is held upright. For this reason,
Once the holding mechanism of the seat back is released, the headrest cannot be held at the standing position or the falling position, so that the headrest is easily moved and flaps during traveling. Also, when moving the headrest between the standing position and the falling position,
The occupant had to perform the falling motion and the standing motion, and the operability was not good. SUMMARY OF THE INVENTION It is an object of the present invention to provide a seat that does not flutter during traveling, has good operability when falling, and can stably hold a headrest at a standing position and a falling position.

[0004]

In order to achieve the above object, according to the present invention, there is provided a lock mechanism for locking a headrest provided to be able to fall down on a seat back only at a standing position and a falling position, and a headrest at a standing position. The headrest is locked between the upright position and the falling position, and the release mechanism releases the locking state of the headrest at the falling position. Is released, the urging means automatically returns to the upright position and is locked at the upright position.

When the headrest is mounted on the seat back via a height adjustment mechanism, the height adjustment mechanism and the locking mechanism, the urging means, and the release mechanism are separately provided to reduce the headrest operation. The height adjustment of the headrest can be performed independently, and while maintaining the height adjustment function of the headrest, there is no flapping during running, and the headrest is stably held in the standing position and the falling position with operability when falling. be able to.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a rear seat will be described below. The rear seat indicated by reference numeral 1 in FIG. 1 is an upper part 1C of a seat back 1A which is supported on a seat cushion 1B via a tilting mechanism 6 so as to be tiltable.
The headrest 3 is detachably mounted via a height adjustment mechanism 4. Headrest 3 is seat back 1
A is supported by the headrest raising / lowering device 5 at a standing position indicated by a solid line with respect to A and a falling position where the seat back 1A falls forward as indicated by a dashed line. The headrest raising / lowering device 5 is housed inside the headrest 3 and is provided separately from the height adjustment mechanism 4.

[0007] The headrest 3, which is located at an inclined position shown by a dashed line in FIG. 1, occupies the lowest position when mounted on the seat back 1A. The height H from the seating point 7 to the headrest 3 at this time is determined by operating the folding mechanism 6 to indicate the seat back 1A by a two-dot chain line.
It is set so as not to interfere with the seat cushion 1B or the seat back 2A of the front seat 2 located at the rearmost position when the vehicle is tilted to the front leaning state where the front seat 2 is overlapped.

As shown in FIGS. 2 and 3, the headrest raising / lowering device 5 locks the headrest 3 only in the standing position and the falling position, and biases the headrest 3 toward the standing position. A return spring 9 serving as a means and a release mechanism 10 for releasing the locked state of the headrest 3 locked at the falling position are provided. These lock mechanism 8, return spring 9, release mechanism 10
Are housed in a pair of side frames 11 and 12 constituting the base of the headrest raising and lowering device 5 as shown in FIG.

The side frames 11, 12 are press-fitted into a cushion member (not shown) constituting the headrest 3, and are integrated. Upper part 11 of side frames 11, 12
a and 12a are fixedly connected to both ends of a frame cloth 13 composed of a hollow shaft. A support shaft 14 is rotatably supported by lower portions 11 b and 12 b of the side frames 11 and 12. The support shaft 14 includes the headrest 3
The bracket 1 is attached to the upper portion (hereinafter referred to as “stay upper portion”) 15a of the stay 15 for attaching the vehicle to the seat back 1A.
It is fixed via 6,17.

The stay 15 is made of a pipe material, and as shown in FIG. 4, an upper portion 15a of the stay is bent at a substantially right angle with respect to a lower portion 15b of the stay to be inserted into the seat back 1A. The headrest 3 is detachably attached to the seatback 1A by inserting the stay lower portion 15b into the upper portion 1C of the seatback 1A. In the present embodiment, the stay upper portion 15a is arranged in the falling direction of the headrest 3 indicated by the arrow A (hereinafter referred to as “falling direction A”) with respect to the stay lower portion 15b, and a support shaft serving as a center of the headrest 3 falling down. 14 is offset with respect to the stay lower part 15b. A plurality of grooves 18 are formed in the stay lower portion 15b at intervals in the extending direction.

The height adjusting mechanism 4 is mounted on the upper part 1C of the seat back 1A, and slidably supports the stay lower part 15b with its casing 19 as shown in FIG. A locking lever 20 is supported in the casing 19 so as to be swingable about a shaft 21. The locking lever 20
One end 20b is projected from the casing 19, and the other end 20a
Is urged toward the center of the stay lower portion 15b by a torsion spring 22 wound around a shaft 21, and when facing the groove 18, enters the groove 18 and regulates the sliding of the stay lower portion 15b. ing. Therefore, the locking lever 2
When 0 is operated to the position indicated by the two-dot chain line, the other end 20b is separated from the groove 18 and the headrest 3 can be moved up and down.

The lock mechanism 8 includes a lock plate 23, a sector gear 24, a lock claw 25,
A tension coil spring 26 is provided. Sector gear 24
Is formed in a substantially sector shape as shown in FIG. 2, and has a center end 24a fixed to the support shaft 14. Sector gear 2
The locking grooves 27 and 28 are formed on the outer peripheral surface 24a of the fourth arc at a predetermined angle. The locking groove 27 is formed in the return direction (hereinafter referred to as “return direction B”) side indicated by an arrow B around the support shaft 14, and the tip of the lock claw 25 when the headrest 3 occupies the standing position. 25a is provided at a position for locking. The locking groove 28 is formed on the side of the falling direction A about the support shaft 14 and is provided at a position where the tip 25a is locked when the headrest 3 occupies the falling position.

The locking claw 25 has its base end 25b pin 3
0 so that it is swingably supported by the side frame 12,
It is arranged on the outer diameter side of the sector gear 24 around the support shaft 14. Above the tip 25a of the claw, a spring hook pin 31 is provided so as to protrude in the axial direction of the support shaft 14 so as to be engageable with the lock plate 26. The spring hook pin 31 and the spring hook 32 provided on the side frame 12
, Both ends of the tension coil spring 26 are locked, and the tip 25a of the lock claw 25 is urged toward the arcuate outer peripheral surface 24a, so that the lock claw 25 has a rotation behavior in the locking direction indicated by the arrow R. Have given.

As shown in FIG. 2, the lock plate 23 has a substantially rhombic shape as a whole, and one end 23a in the longitudinal direction is fixed to the support shaft 14, and the lock claw 25 and the sector gear 2 are fixed.
6 is disposed closer to the center of the support shaft 14. The slope 23c located at the rotation end 23b of the lock plate 23
It is arranged in the falling direction A more than the spring hook pin 31.
On the slope 23c, an engaging portion 33 which is depressed in the falling direction A and is larger than the diameter of the spring hook pin 31 and a push-up protrusion 34 are formed in front of the engaging portion 33. The push-up protrusions 34 are formed on the outer peripheral surface 24 of the circular arc, the tip 25a of the claw being indicated by a chain line
a is formed higher than the trajectory E drawn by the lower surface of the spring hook pin 31 when moving on the upper side a, and constitutes a release member for pushing up the spring hook pin 31 to release the locked state of the tip 25a and the engagement groove 28. ing.

Lock plate 23 and side frame 1
2, arc-shaped grooves 35 and 36 centered on the support shaft 14 are formed to face each other. These arc-shaped grooves 35, 3
6, pins 29 erected on the side surfaces of the sector gear 24 are loosely fitted, respectively, and regulate the rotation range of the lock plate 23 and the side frame 12 around the support shaft 14. The length of the arc-shaped groove 35 is an angle at which the pin 29 can come into contact with both ends 35a, 35b of the groove when the distal end 25a is locked in the locking grooves 27, 28, respectively. It is the angle from the position to the fall position. The arc-shaped groove 36 is formed at both ends 35a of the arc-shaped groove 35,
The lock plate 23 is formed longer than 35b.
Are configured to be able to rotate the side frames 11 and 12 around the support shaft 14 even after the movement of the side frames 11 and 12 is restricted. The engagement portion 33, the push-up protrusion 34, and the arc-shaped grooves 35 and 36 constitute the release mechanism 10.

The return spring 9 is wound around a support shaft 14, and one end 9 a of the return spring 9 is attached to the lower portion 1 of the side frame 11.
1b, the other end 9b of which is inserted through the support shaft 14.
7, and urges the side frames 11, 12 in the return direction B. As a result, the headrest 3
It is biased toward the standing position. The return spring 9 accumulates a spring force as the headrest 3 moves in the falling direction A, and gives the headrest 3 a habit of returning to the standing position.

According to such a configuration, the claw tip 25a
Are urged in the locking direction R as shown in FIG. 2, so that the headrest 3 is locked in the engagement groove 27 when the headrest 3 is in the upright position. The pin 29 is in contact with one end 35 a of the arc-shaped groove 35, and regulates the movement of the lock plate 23 in the return direction B by the return spring 9.
By these actions, the headrest 3 is held at the standing position in the locked state.

When the occupant pushes or pulls, the headrest 3
When the load in the falling direction A is applied to the headrest 3, the headrest 3 moves in the falling direction A. Along with this, the tip 25a of the nail
Moves in the disengagement direction indicated by the arrow C, disengages from the engagement groove 27, and moves on the arc outer peripheral surface 24a toward the engagement groove 28.
When the headrest 3 occupies the falling position as shown in FIG. 6, the tip 25a of the claw falls into the engagement groove 28 and is locked, and the pin 29 is inserted into the other end 35a of the arc-shaped groove 35.
And the movement of the lock plate 23 in the falling direction A is restricted. At this time, a biasing force in the lock direction R and a return force in the return direction A by the return spring 9 act on the distal end 25a. It is locked in the fall position.

To release the locked state, a load in the falling direction A is applied to the headrest 3 once. Then, as shown in FIG. 7, the rotation of the lock plate 23 in the falling direction A is restricted by the pin 29 and the other end 35 b, but since the arc-shaped groove 36 is longer than the arc-shaped groove 35, the side frame 11 and 12 further rotate in the falling direction A about the support shaft 14. For this reason, the lock claw 25 supported by the side frame 12 also rotates in the falling direction A together,
The spring projection pin 31 is pushed up by a pressing projection 34 provided on the lock plate 23 whose rotation is restricted. The pushed-up spring hook pin 31 is held by the engaging portion 33. As a result, the tip 25a of the claw is held in a detached state disengaged from the locking groove 28, so that there is no restriction on the movement of the headrest 3 in the return direction B, and the headrest 3 is returned by the return force of the return spring 9. It automatically returns to the direction B, that is, the upright position.

When the headrest 3 rotates in the return direction B, as shown in FIG. 2, one end 35a of the arc-shaped groove 35 collides with the pin 29, and the movement of the lock plate 23 in the return direction B is restricted. At this time, since the lock claw 25 moves while being held in the detached state, the tip 25a and the arc outer peripheral surface 24a are moved.
Are not slid in contact with each other, the movement in the return direction B is performed smoothly, there is no sliding contact noise between the two, and wear of the tip 25a is reduced.

The movement of the lock plate 23 in the return direction B is restricted by the pin 29 and one end 35a.
6 is longer than the arc-shaped groove 35, and the side frames 11, 1
Since the return force of the return spring 9 acts on 2,
The side frames 11 and 12 further rotate about the support shaft 14 in the return direction B. For this reason, the side frame 12
The lock claw 25 supported by the lock plate 23 also rotates in the return direction B, and the spring hook pin 31 is pushed up by the pressing protrusion 34 provided on the lock plate 23 whose rotation is restricted. As a result, the spring hook pin 31 is removed from the engaging portion 33, the tip end 25a of the claw is locked in the engaging groove 27, and the headrest 3 is locked in the upright position.

As described above, since the headrest 3 can be locked at the standing position and the falling position by using the lock mechanism 8, the headrest 3 can be stably held at the standing position and the falling position, and the flutter during running can be reduced. Can be suppressed. The locked state of the headrest 3 is released at the falling position by the return mechanism 10, and the head spring 3 is automatically returned from the falling position to the standing position by one-touch operation by the action of the return spring 9, so that the operability at the time of falling is significantly improved.

Since the seat height can be reduced without removing the headrest 3 from the seat back 1A, the rear view can be easily secured. Since the headrest 3 falls down to the front side of the seat back 1A, the protrusion of the headrest 3 from the seat back 1A can be suppressed even when the seat back 1A is in the forward leaning state. For this reason, the rear seat 2
The back of the luggage compartment is located behind the seat back 1A
When the back surface 1D is used as the floor of the luggage compartment, the floor can be easily flattened, and the entire length of the floor can be made longer than that in which the headrest 3 projects toward the back surface 1D, so that the loadability is improved.

Since the height adjusting mechanism 4 is provided on the side of the seat back 1A and the headrest lowering device 5 is housed in the headrest 3 and provided separately, the headrest lowering operation and the height adjustment can be performed separately. Good operability.

In the above-described embodiment, the headrest raising / lowering device 5 is connected to the rear seat 1 on which the seat back 1A can be tilted.
However, the present invention is not limited to this, and the present invention may be applied to a type of seat where the seat back cannot fall down. Further, the application of the present invention is not limited to the rear seat, but may be applied to the front seat 2 or to a third seat when three rows of seats are provided.

[0026]

According to the present invention, the headrest is securely locked between the standing position and the falling position, and when the lock at the falling position is released by the release mechanism, the headrest is automatically returned to the standing position by the urging means. As a result, the headrest can be held again at the standing position, so that the headrest can be stably held at the standing position and the falling position without flapping during traveling, with good operability at the time of falling.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a configuration of a seat provided with a tiltable headrest according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing an internal structure of a retractable headrest and a standing position of the headrest.

FIG. 3 is a partially broken enlarged front view showing a configuration of a lock mechanism, an urging means, and a release mechanism which are main parts of the present invention.

FIG. 4 is an enlarged side view showing a mounting structure of a stay and a spindle.

FIG. 5 is an enlarged sectional view showing one mode of a height adjusting mechanism.

FIG. 6 is an enlarged cross-sectional view illustrating a locked state of the tiltable headrest at a tilted position.

FIG. 7 is an enlarged cross-sectional view showing an unlocking operation of the retractable headrest at a fall position.

[Description of Signs] 1A Seat back 3 Headrest 8 Lock mechanism 9 Urging means 10 Release mechanism

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yoshiyuki Shimomura 5-33-8 Shiba, Minato-ku, Tokyo F-term in Mitsubishi Motors Corporation (reference) 3B087 DC08 DC09

Claims (1)

[Claims] 1. A seat having a headrest provided on a seat back such that the headrest can be turned upside down, wherein a lock mechanism for locking the headrest only at a standing position and a falling position is provided, and a biasing mechanism for urging the headrest toward the standing position. A seat provided with a flip-up type headrest, comprising: a biasing means; and a release mechanism for releasing a locked state of the headrest at the falling position.