JP2578515Y2 - Reclining seat device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reclining seat device having a detachable headrest on a seat back, and the seat back being supported on a seat cushion by a reclining device so that the seat back can be moved forward.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional reclining seat apparatus of this type. A reclining device 2 is provided at the rear end of the seat cushion 1.
The seat back 3 is supported so that it can be moved forward,
A detachable headrest 4 is attached to the upper end of the seat back 3. The seat back 3 is configured to fall forward when unlocked by a return reaction force of a spiral spring (not shown) constituting the reclining device 2.

Here, the return reaction force is represented by the value of (distance from the center of gravity of the seat back to the center of forward leaning; L) × (weight of the center of gravity of the seat back; G). Is considerably different if the headrest 4 is not attached to the seat back 3.

[0004] That is, the return reaction force in the case of mounting the headrest 4 to the seat back 3 is L ₁ × G, on the other hand, although the return reaction force in the case of not attaching the headrest 4 is L ₂ × G, L ₁ > because it is L _2, the value of the return reaction force in the case of mounting the headrest 4 to the seat back 3, becomes larger than the value when not wearing the headrest 4. Therefore, even when the headrest 4 is mounted on the seat back 3, in order to move the seat back 3 forward, it is necessary to set the return reaction force of the spiral spring to L ₁ × G in advance.

[0005]

However, in such a conventional reclining seat apparatus, since the return reaction force of the spiral spring is set in a state where the headrest 4 is mounted on the seatback 3, the headrest 4 is not moved. If the seatback 3 is moved forward in the detached state, the return reaction force is too strong, and the seatback 3 is rapidly moved forward, so that there has been a problem that sufficient consideration has not been given to safety.

The present invention has been made in view of such a conventional problem, and adjusts the return reaction force of the spiral spring for moving the seat back forward depending on whether or not the headrest is attached to the seat back. It is an object of the present invention to provide a reclining seat apparatus which can take a sufficient safety consideration without abruptly moving a seat back forward.

[0007]

The gist of the present invention is to provide a seat back (12) having a detachable headrest (15) so that the seat back (12) can be tilted forward. In a reclining seat device (10) supported by a cushion (11),
A lower portion of the seat back (12) is pivotally attached to a rear portion of the seat cushion (11) via a reclining shaft (23) so that the lower portion of the seat back (12) can be tilted in the front-rear direction. And a pivot member (30) pivotally supported independently of the other and pivots around the reclining shaft (23) as a winding center of a spiral spring (40) for urging the seat back (12) forward. While the start end (41) is locked, the spiral end (42) of the spiral spring (40) is locked.
Is fixed to one end of the link member (30), and a rod member (60) movable vertically is provided in the seat back (12), and a lower end of the rod member (60) is connected to the link. It is connected to the other end of the member (30) so as to be able to be pushed and pulled, and the upper end of the rod member (60) is arranged at a position where it can be pushed downward by a stay member (16) supporting the headrest (15). When the headrest (15) is attached to the seat back (12), the stay member (1)
The rod member (6) which is pushed downward by the
0) is configured to rotate the link member (30) in a direction in which the squeezing angle of the spiral spring (40) increases and the reaction force increases.
0).

[0008]

The seat back (12) has the reclining shaft (23) centered on the reclining shaft (23).
3) The spiral spring (40), which locks the winding start end (41) on the winding start side (41), can be moved forward by the biasing force, that is, the return reaction force. The return reaction force of the spiral spring (40) is adjusted according to the attachment / detachment of the headrest (15) to / from the seat back (12).

That is, when the headrest (15) is not mounted on the seat back (12), the seat is returned by the return reaction force of the spiral spring (40) which is set to an appropriate value in advance based on such a state. Back (1
2) move forward at a smooth and safe speed.

On the other hand, when the headrest (15) is attached to the seat back (12), the headrest (15)
The stay member (16) for supporting the seat back (1)
Push the rod member (60) contained in 2) downward. Then, the rod member (60) that has moved downward rotates the link member (30), the lower end of which is connected, in a direction that increases the squeezing angle of the spiral spring (40) and increases the return reaction force. .

Accordingly, when the headrest (15) is mounted on the seat back (12), even if the weight of the center of gravity of the seat back increases and the return reaction force required for forward leaning increases, the Accordingly, the return reaction force of the spiral spring (40) can be increased, and the seat back (1
2) can be smoothly and safely moved forward with a sufficient return reaction force.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the present invention. As shown in FIGS. 1 and 2, the reclining seat device 1
Reference numeral 0 indicates that the seat back 12 is supported by a rear portion of the seat cushion 11 via a reclining mechanism 20 so as to be able to fall forward. A detachable headrest 15 is provided at the upper end of the seat back 12.

The reclining mechanism 20 includes a base member 2 bolted to both sides of the rear end of the seat cushion 11.
1, 21a and arm members 22, 22a bolted to both sides of the base end portion of the seat back 12. Each arm member 22, 22a is connected to a reclining shaft 23 fixed to the base member 21, 21a. It is pivotally mounted so that it can tilt in the front-rear direction.

The reclining shaft 23 has a link member 3 rotatable independently of the arm members 22 and 22a.
0, 30a is pivoted. A pin 31 is protruded from one end of the link member 30, and the outermost end 42 of the spiral spring 40 is engaged with the pin 31.

The spiral spring 40 is a member for urging the seat back 12 forward by the return reaction force.
The winding start end side 41 which is the winding center is the reclining shaft 2
3 is fixed to the groove at the tip. That is, in FIG. 1, when the link member 30 is rotated clockwise about the reclining shaft 23, the squeezing angle of the spiral spring 40 is increased, and the return reaction force is set accordingly. I have.

A rod member 60 is provided in the seat back 12 so as to be vertically movable along the frame member. More specifically, first, the frame member 13
Is made by bending a pipe material into a rectangular shape,
Side plates 16 and 16 are fixed to the lower half of 5. The arm member 22 of the reclining mechanism is fixed to the side plate 16.

Further, a reinforcing plate 17 for supporting the rod member 60 is provided in the middle of both side parts 15 and 15. Further, holder members 14a, 14a for inserting and supporting a pair of stay members 16, 16 of the headrest 15 are fixed to the upper portion 14.

The rod member 60 comprises a pair of input rods 61, 61 corresponding to the pair of stay members 16, 16 of the headrest 15, and an output rod 62 fixed to the lower ends of the input rods 61, 61. A pair of input rods 6
The reference numerals 1 and 61 are supported by a reinforcing plate 17 via a support bracket 18 so as to be vertically movable. Both sides of the output rod 62 are fitted into guide grooves 16a formed in the side plate 16 so as to be vertically movable.

The lower ends of both sides of the output rod 62 of the rod member 60 are rotatably supported by the other end of the link member 30 via a pivot pin 32. The other end of the link member 30 is connected so as to be pushed and pulled. That is, as shown in FIG. 3, when the headrest 15 is mounted on the seat back 12, the rod member 60, which is pushed downward by the pair of stay members 61, 61 and moves, connects the link member 30 to the spiral spring 40. It is configured to rotate in a direction (clockwise direction) that increases the squeezing angle and increases the reaction force.

Further, the reclining mechanism is provided with a lock mechanism for supporting the seat back 12 at a desired tilt angle. That is, as shown in FIG. 1, a sector gear 24 centering on a reclining shaft 23 is engraved on the lower end edge of the arm member 22. The sector gear 24 is engaged and disengaged to restrain the arm member 22 from tilting and release the restraint. The tooth member 25 is pivotally supported by the base member 21 in a swingable manner.

An operation lever 27 for operation by a seated person is pivotally attached to the base member 21 via a pivot 26 so as to swing between a lock position and an unlock position.
When the lock 7 is swung from the unlocked position to the locked position, a cam member 27 a provided at one end of the operation lever 27 engages the tooth member 25 with the sector gear 24. The lock mechanisms on both sides are connected by cables 50 so as to release the restraint of the pair of arm members 22 and 22a on both sides of the seat cushion 11 in synchronization with one operation lever 27.

Next, the operation will be described. As shown in FIG.
The tooth member 25 of the reclining mechanism is the arm member 2
When meshing with the second sector gear 14, the seat back is restrained from tilting. On the other hand, when the occupant of the reclining seat device 10 pulls above the operation lever 27, the tooth member 25 is disengaged from the sector gear 14 and the arm member 2
2 is released, and the arm member 22a on the opposite side is also unlocked in synchronization with the cable 50.

Accordingly, when the operating lever 27 is pulled upward in a state where no one is sitting on the reclining seat device 10, the seat back 12 is centered on the reclining shaft 23 and the winding start end 41 is attached to the reclining shaft 23. The walk-in operation can be performed forward by the return reaction force of the locked spiral spring 40.

During the walk-in operation, as shown in FIG. 1, when the headrest 15 is not mounted on the seat back 12, the return spring of the spiral spring 40, which is set to an appropriate value in advance based on this state, is set. By force, the seat back 12 moves forward at a smooth and safe speed.

On the other hand, as shown in FIG.
When the headrest 15 is mounted on the seat 2, the stay member 16 supporting the headrest 15 pushes the rod member 60 provided inside the seat back 12 downward. The rod member 60 that has moved downward is connected to the link member 30 to which both lower ends of the output rod 62 are connected.
Are rotated in a direction to increase the squeezing angle of the spiral spring 40 to increase the return reaction force.

Accordingly, when the headrest 15 is mounted on the seat back 12, even if the weight of the center of gravity of the seat back 12 increases and the return reaction force required for forward leaning increases accordingly, The return reaction force of the spiral spring 40 can be strengthened. Therefore, the seat back 12 can be smoothly and safely moved forward with a sufficient return reaction force.

[0027]

According to the reclining seat device of the present invention, when the headrest is mounted on the seatback, the rod member which is pushed by the stay member and moves downward in the seatback moves the seatback through the link member. Since the squeezing angle of the spiral spring biased in the forward direction is increased to increase the reaction force, the return reaction force of the spiral spring can be automatically adjusted according to the attachment / detachment of the headrest to / from the seat back. Thereby, regardless of whether the headrest is mounted or not, the seat back can always be smoothly and safely moved forward, and safety can be improved.

[Brief description of the drawings]

FIG. 1 is a side view showing a state in which a headrest is removed from a seat back of a reclining seat device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a frame member of the reclining seat device according to the embodiment of the present invention;

FIG. 3 is a side view showing a state in which a headrest is mounted on a seat back of the reclining seat device according to the embodiment of the present invention;

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Reclining seat apparatus 11 ... Seat cushion 12 ... Seat back 13 ... Frame member 20 ... Reclining mechanism 21 ... Base member 22 ... Arm member 23 ... Reclining shaft 30 ... Link member 40 ... Spiral spring 60 ... Rod member

Claims (1)

(57) [Scope of request for utility model registration] 1. A reclining seat apparatus comprising: a seat back having a detachable headrest, wherein the seat back is supported by a seat cushion so that the seat back can be tilted forward, wherein a lower portion of the seat back is provided at a rear portion of the seat cushion via a reclining shaft. Is pivotably attached to the back and forth direction, and the reclining shaft pivotally supports a link member that is rotatable independently of the seat back, and biases the seat back to the reclining shaft in the forward direction. A winding start end side serving as a winding center of the spiral spring is locked, while a winding end side of the spiral spring is locked to one end of the link member, and a vertically movable rod member is mounted on the seat back. The lower end of the rod member is pushably connected to the other end of the link member, and the upper end of the rod member supports the headrest. When the headrest is mounted on the seat back, the rod member which is pushed downward by the stay member and moves when the headrest is attached to the seat back increases the squeezing angle of the spiral spring by pressing the link member. A reclining seat device characterized in that it is configured to rotate in a direction in which a reaction force increases.