JP2540025Y2 - Reclining 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 device for tiltably supporting a seat back at a rear end of a seat cushion in a vehicle seat or the like, and more particularly to a reclining device for urging the seat back forward of the seat. The present invention relates to an improvement of a reclining device configured to be able to appropriately perform a tilting operation from a full reclining state pushed down to the back side of the cushion to a normal sitting posture state, and further to a front falling state in which the seat cushion is moved forward on a seating surface. .

[0002]

2. Description of the Related Art Generally, a vehicle seat 1 is, for example, shown in FIG.
As shown in FIG. 1, a seat cushion 2 and a seat back 4 which is erected at a rear end side thereof by a reclining device 3 so as to be tiltable and adjustable are provided. Then, the tilt angle of the seat back 4 is arbitrarily selected by the reclining device 3, and the front and rear slide mechanism (not shown) that supports the entire seat 1 on the vehicle body floor adjusts the sliding in the vehicle front and rear direction. Thus, a seating state according to the occupant's body type and preference can be obtained.

[0003] As a reclining device 3 used in this type of vehicle seat 1, for example, FIG.
A configuration as shown in FIG. 4 is known. Briefly describing this, reference numeral 5 in the figure denotes a base provided on the side of the seat cushion 2, and 6 denotes a base rotatably supported by the base 5 via a rotation shaft 7, and This is an arm provided on the side.

[0004] Further, reference numeral 8 selectively locks and unlocks a well-known lock mechanism (not shown) interposed between the base 5 and the arm 6 and capable of locking the tilt angle of the seat back 4 at an arbitrary position. When the lock mechanism is unlocked by manual operation of the operation lever 8, the reclining operation lever 9 causes the arm 6 on the seatback 4 side to return to the front of the seat 5 with respect to the base 5. It is a return spring for. In this example, a case in which a spiral spring is used as the return spring 9 is illustrated, and one end of the spiral spring is provided on the rotation shaft 7 on the base 5 side, and the other end is provided on the arm 6.
It is hooked on a.

[0005]

However, according to the above-described conventional reclining device 3, the return force of the return spring 9 for urging the seat back 4 toward the front of the seat depends on the tilting posture position of the seat back 4. It becomes larger or smaller, which causes problems in practical use.

That is, the above-mentioned seat back 4 is pushed down to the back side of the seat 1 from a normal sitting posture state in which the seat back is in an upright state as shown by a solid line in FIG. It is tilted so as to be in a full reclining state (indicated by a dashed line in the figure), or to be in a forwardly inclined state (indicated by a broken line in the figure) in which the seat 1 is tilted forward and overlapped on the seating surface of the seat cushion 2. , And is locked at a predetermined tilt angle position.

In performing such tilt adjustment, when the seat back 4 is in the full reclining state, since the return force of the return spring 9 is the largest, the lock is released by the operation lever 8.
The seat back 4 may suddenly rise due to the large return force of the return spring 9 and the acceleration, and may cause a problem such as a collision with an operator.

Also, when the seat back 4 is caused to fall forward, if the return force by the return spring 9 is large, the seat back 4 falls down sharply. For example, in a one-box car or the like, the face of a person sitting on the facing seat There were also problems such as hitting.

For this reason, it is conceivable that the urging force of the return spring 9 is weakened. However, if the return force is too small, the seat back 4 cannot be raised from a full reclining state or the like, or the seat back 4 cannot move from a normal sitting posture. In consideration of these points, it is desired to take some measures to allow the seat back 4 to return and fall forward at an appropriate speed.

[0010]

In order to meet such a demand, a reclining device according to the present invention rotates an arm provided at a lower end portion of a seat back with respect to a base provided at a rear end portion of a seat cushion. A return spring, which is pivotally supported by a shaft and supports the seat back so that the seat back can be tilt-adjusted, and applies a biasing force to the seat back toward the front of the seat, is provided between the base provided on the seat cushion side and the seat back side. In a reclining device interposed between the arm and a provided arm, a locking pin is projected from a position eccentric to the rotation axis of the arm, and the rotation axis is A tension spring is provided to extend between the base and the base substantially opposed to each other, and the tension spring is tilted by the seat back. By traverse on the pivot shaft along with the operation, and characterized by being configured so as to reverse the pulling direction with respect to the latching pin.

[0011]

According to the present invention, when the seat back is in a full reclining state, the biasing direction of the tension spring provided between the base and the arm acts on the rear side of the seat, and the return force and acceleration by the return spring. To reduce the rate of rise of the seat back, and to move the tension spring across the axis of rotation (dead point) as it shifts to the normal sitting posture and the forward leaning state. The direction is reversed to produce a force in front of the seat, and an action force that assists the return spring is generated, and it is possible to sufficiently obtain the return force required for falling forward, and to tilt the required seat back based on the seat back posture. Operation can be obtained.

[0012]

1 and 2 show an embodiment of a reclining device according to the present invention. In these drawings, the same or corresponding parts as those in FIGS. 3 and 4 are denoted by the same reference numerals. The detailed description is omitted. In addition, FIG.
FIG. 5 is a view seen from the opposite side of the conventional structure shown in FIG. 4, and is not shown in FIG. 1, but includes a return spring 9, an operation lever 8, and a lock mechanism and the like which are not shown. Is what it is.

According to the present invention, in the reclining device 3 described above, the seat is interposed between the base 5 on the seat cushion 2 side and the arm 6 on the seat back 4 side supported so as to be tiltable and adjustable. A return spring 9 for urging the back 4 forward of the seat 1;
A latch pin 10 is protruded at a position eccentric with respect to the rotation shaft 7 of the arm 6 and is provided at an eccentric position of the base 5 substantially opposed to the latch pin 10 via the rotation shaft 7. A tension spring 13 is provided so as to extend between the spring retaining bracket 12 and the tension spring 13 so as to traverse the pivot 7 serving as a dead point as the seatback 4 tilts, The present invention is characterized in that the pulling direction with respect to the latch pin 10 is reversed.

Here, reference numeral 11 in the figure denotes an arc-shaped guide groove provided in the base 5 in which the latch pin 10 is engaged and the rotation range is regulated.

According to such a configuration, the seat back 4
When is in a full reclining state, the urging direction of the tension spring 13 provided between the base 5 and the arm 6 is applied to the back side of the seat 1 as is clear from the dashed arrow shown in FIG. A return force or a force against the acceleration by the return spring 9 is generated, and the rising speed of the seat back 4 can be reduced. Further, the tension spring 13 is made to cross the rotation shaft 7 (dead point) as it shifts to the normal sitting posture state and the forward falling state, so that the spring 13
2 is reversed as shown by the solid line arrow in FIG. 2 to generate a force for assisting the return spring 9 as a force toward the front of the seat 1 to sufficiently obtain a return force required for the forward fall. Thus, it is possible to obtain a required tilting operation of the seat back 4 according to the seat back 4 posture.

In such a configuration, the urging force of the tension spring 13 is applied to the rotating shaft 7 serving as a dead point.
It is possible to sort forward or backward when you get over. For example, from the full reclining state to the normal sitting posture state, the force of the tension spring 13 can be applied in a direction in which the return force of the return spring 9 decreases. In such a structure, the reclining operation, that is, the operation force when pushing down from the normal sitting posture to the full reclining state can be reduced. on the other hand,
When shifting from the normal sitting posture to the forward leaning state, the force of the tension spring 13 can be reversed and used as a force toward the front of the seat, that is, a force that assists this force in the same direction as the return spring 9. In addition to this, there is an advantage that not only the reliable forward fall can be achieved but also the urging force of the return spring 9 can be reduced as compared with the related art.

In particular, according to the present invention, the tension spring 13 can be skillfully used as an auxiliary spring for the return spring 9, and as a result, the spring constant of the springs 9, 13 used in the entire reclining device 3 is reduced. Is possible, and the practical advantage is great.

The present invention is not limited to the structure of the embodiment described above, and it goes without saying that the shape, structure and the like of each part of the reclining device 3 can be appropriately modified and changed. Further, it will be easily understood that the present invention is not limited to the reclining device 3 for the vehicle seat 1 as described above, but may be any seat having a reclining device.

[0019]

As described above, according to the reclining device according to the present invention, the base and the arm having the return spring for urging the seat back toward the front of the seat interposed with respect to the rotation axis of the arm. At the eccentric position, a latch pin is protruded, and a tension spring is provided so as to span the eccentric position of the base substantially opposed to the latch pin via a rotation shaft, and The tension spring is configured to traverse the axis of rotation as the seatback tilts and to reverse the direction of tension with respect to the latch pin. Instead, when the seat back is in the full reclining state, the biasing direction of the tension spring provided across the base and the arm, It is a force to the back of the seat that resists the return force and acceleration caused by the turn spring, slowing the rising speed of the seat back, lightening the reclining operation force, and transitioning to the normal sitting posture state and forward leaning state As a result, the tension spring is traversed on the rotation axis, which is the dead point, and the direction of action of the spring is reversed, acting as a force acting on the front of the seat to assist the return spring, to obtain sufficient return force required for falling forward. In addition to this, the urging force of the return spring can be reduced, and as a result, there are various practically excellent effects that the seat back can be appropriately tilted in accordance with the state of the seat back posture.

[Brief description of the drawings]

FIG. 1 is a schematic exploded perspective view of an embodiment of a reclining device according to the present invention, showing a main part configuration thereof.

FIG. 2 is an explanatory diagram for explaining a deceleration operation state by the friction engagement mechanism shown in FIG. 1;

FIG. 3 is a schematic diagram for explaining a seat back tilting posture by the reclining device.

FIG. 4 is a schematic perspective view for explaining a configuration of a return spring and the like in the reclining device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Seat cushion 3 Reclining device 4 Seat back 5 Base 6 Arm 7 Rotating shaft 8 Reclining operation lever 9 Return spring 10 Latch pin 11 Arc guide groove 12 Spring latch bracket 13 Tension spring

Claims (1)

(57) [Scope of request for utility model registration] An arm provided at a lower end portion of a seat back is pivotally supported by a rotation shaft with respect to a base provided at a rear end portion of a seat cushion, and the seat back is supported so as to be tiltable and adjustable. In a reclining device in which a return spring for applying a biasing force to a seat front with respect to a back is interposed between a base provided on the seat cushion side and an arm provided on the seat back side, At a position eccentric with respect to the rotation axis, a latch pin is projected and provided, and a tension spring is provided between the latch pin and the base substantially opposed to the latch pin via the rotation axis, Further, by causing the tension spring to traverse on the rotation axis in accordance with the tilting operation of the seat back, the tension with respect to the latch pin is pulled. Reclining apparatus characterized by being configured so as to reverse the direction.