JPH05278508A - Seat for vehicle - Google Patents

Abstract

PURPOSE:To provide a vehicle seat where a rod does not obstruct a passenger, and a seat back can be surely held at a rear position at the time of the sudden deceleration of a vehicle. CONSTITUTION:The side 16A of the cushion frame 16 of a vehicle seat 10 is provided with a rail 24, whose rear end 24A attains a position on about the same axis with a hinge 25. The end 34A of the inner sleeve 34 of a rod 32 is rotatably connected to the side 26A of a back frame 26, and the end 36A of an outer sleeve 36 of the rod 32 is rotatably connected to a block 40 slidably inserted in the rail 24. A locking piece is inserted into the end 36B of the outer sleeve 36, and when the inner sleeve 34 is about to move in a direction where the rod 32 is shortened, each locking piece abuts on the ring groove of the inner sleeve 34 to check the movement of the inner sleeve 34.

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, it relates to a vehicle seat that holds a seat back at a rear position when the vehicle suddenly decelerates.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Application Laid-Open No. 60-21710 discloses an example of a vehicle seat in which a belt system in which a seat belt anchor portion is provided in the seat is applied to a reclining seat.

As shown in FIG. 6, this vehicle seat 7 is used.
At 0, the seat back 74 is rotatably connected to the seat cushion 72, which is a so-called reclining mechanism. The retractor 7 is provided on the back of the seat back 74.
3 is fixed, and the seat belt 75 extending from the retractor 73 passes through a belt withdrawal port 77 formed at the upper end of the seat back 74. Further, both ends 80A and 80B of a stretchable reinforcing rod 80 composed of two rigid pipes 76 and 78 are connected to the side part 72A of the seat cushion 72 and the side part 74A of the seat back 74. Further, as shown in FIG. 7, a plurality of holes 82 are formed in the rigid pipe 78 along the longitudinal direction, and the other rigid pipe 76 can be inserted into and removed from the holes 82 of the rigid pipe 78. The engaging member 84 and the connecting member 88 for releasing the engagement between the engaging member 84 and the hole 82 by operating the adjuster lever 86 shown in FIG. 6 are provided.

Therefore, when the vehicle decelerates suddenly, the seat belt 75 moves forward with the occupant and the seat back 74 tends to fall forward, but the reinforcing rod 80 holds the seat back 74 at the rear position. Is becoming

[0005]

However, in the vehicle seat 70, the reinforcing rod 80 causes
Seat cushion 72 side 72A and seat back 74
The side portion 74A is always connected.
Therefore, the reinforcing rod 80 interferes with the movement of the occupant's waist and arms.

Further, even in a normal seat which does not use a belt system in which the anchor portion of the seat belt is provided in the seat, when the vehicle suddenly decelerates, the passenger in the rear seat may
Since the seat back may be pressed forward, a mechanism for holding the seat back at the rear position when the vehicle is suddenly decelerated is required.

In view of the above facts, an object of the present invention is to obtain a vehicle seat in which the rod does not hinder the occupant and can securely hold the seat back at the rear position when the vehicle is suddenly decelerated.

[0008]

According to a first aspect of the present invention, there is provided a vehicle seat having a rail provided on a side surface of a seat cushion along a front-rear direction, and a telescopic end having a side portion of a seat back. A rod that is rotatably connected and the other end of which is slidably fitted to the rail, a stopper that is provided on the rod and that fixes the rod to an arbitrary length when the rod extends, and a vehicle having a predetermined value or more. Deceleration detecting means for detecting the sudden deceleration state of the vehicle, and drive for moving the other end of the rod along the rail to the front of the vehicle body when the deceleration detecting means detects the rapid deceleration state of the vehicle of a predetermined value or more. Means and are provided.

[0009]

In the vehicle seat according to the first aspect of the present invention, when the vehicle deceleration detecting means detects a sudden deceleration state of the vehicle which is equal to or more than the predetermined value, the other end of the rod is driven by the driving means. It is moved to the front of the vehicle along the rail. As a result, the rod rotates about the end portion rotatably connected to the side portion of the seat back as a rotation center, and is extended and fixed to an arbitrary length by the stopper in the extended state.

Therefore, even if the occupant seated in the rear seat pushes the seat back forward, the rod can reliably hold the seat back at the rear position.

Further, in a normal state, the other end of the rod is held at a position substantially coaxial with the seat back along the rail and the hinge of the seat cushion, and the rod is arranged at a position along the side surface of the seat back. Therefore, the rod does not interfere with the movement of the occupant's waist, arms, etc.
There is no need to adjust the rod length when reclining.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle seat of the present invention will be described with reference to FIGS. In the figure, an arrow FR indicates a seat front direction, and an arrow UP indicates a seat upper direction.

As shown in FIG. 1, the vehicle seat 10 of this embodiment includes a seat cushion 12 and a seat back 14.
The seat cushion 12 is supported on the floor of the vehicle by a seat slide device (not shown).
It can be moved in the front-back direction of the vehicle. On the other hand, the lower end portion of the seat back 14 is rotatably connected to the rear end portion of the seat cushion 12 and can be reclined.

The seat cushion 12 includes a cushion spring 18 provided on an upper portion of a cushion frame 16.
And the cushion material 20 and the skin 22 attached around the cushion frame 16.

A rail 24 is provided on a side surface 16A of the cushion frame 16 along the seat front-rear direction, and a rear end portion 24A of the rail 24 is substantially coaxial with a hinge 25 connecting the seat back 14 and the seat cushion 12. Reached the upper position.

The seat back 14 includes a back frame 26 made of a pipe material and the back frame 2
Cushion material 28 and skin 30 attached around 6
It has a structure with. One end 34A of the inner cylinder 34 of the rod 32 is rotatably connected to the upper portion of the side portion 26A of the back frame 26 by a bolt 36 and a nut 38. On the other hand, one end 36A of the outer cylinder 36 of the rod 32 is rotatably connected to a block 40 slidably inserted in the rail 24 by a bolt 42.

As shown in FIG. 2 (A), the other end 36B of the outer cylinder 36 of the rod 32 has an enlarged diameter. Figure 2
As shown in (B), a ring groove 42 is formed on the inner peripheral surface of the end portion 36B of the outer cylinder 36.
In FIG. 2, a pair of arcuate stopper pieces 44 as stoppers are provided in the radial direction (arrows A1 and A2 in FIG. 2B).
And movably in the radial direction (arrows B1 and B2 in FIG. 2B).

Between the ring groove 42 and each locking piece 44,
Coil springs 46 are inserted in the respective coil springs 46.
Energized in the A2 direction.

As shown in FIG. 2A, ring grooves 48 are formed on the outer peripheral portion of the inner cylinder 34 at predetermined intervals. 2A, the wall portion 48A on the upper side (end portion 34A side) of FIG. 2A is a vertical surface.
The lower wall portion 48B of (A) is an inclined surface whose diameter is gradually increased.

Therefore, when the inner cylinder 34 is pulled out from the outer cylinder 36 and the rod 32 extends, that is, the inner cylinder 34 is shown in FIG.
When moving in the direction of arrow C in (A), each locking piece 44
Slides on the wall portion 48B of the inner cylinder 34 and moves in the directions of arrows B1 and B2 in FIG. 2B against the biasing force of the coil spring 46. On the other hand, when the inner cylinder 34 tries to move in the direction opposite to the arrow C direction in FIG. 2A, the locking pieces 44 come into contact with the wall portion 48A of the inner cylinder 34 to move in the arrow C direction of the inner cylinder 34. It is designed to prevent movement in the opposite direction.

As shown in FIG. 3, the block 40 slidably inserted in the rail 24 and the front end portion 24B of the rail 24 are connected by a coil spring 50 as a driving means. Reference numeral 50 urges the block 40 forward (in the direction of arrow D in FIG. 3).

A branch portion 24C is provided downward in the vicinity of the rear end portion 24A of the rail 24. This branch 24C
An engagement pin 52 is movably inserted downward (in the direction of arrow E in FIG. 3), and the engagement pin 52 is biased by a coil spring 54 in the direction of arrow E in FIG.
A convex portion 52A is formed on the engaging pin 52 toward the front, and the convex portion 52A is engaged with a deceleration sensor 56 provided as a deceleration detecting unit provided below to be in a holding position. ing.

At this holding position, the upper end portion 5 of the engaging pin 52 is
2B is engaged with the front end portion 40A of the block 40,
Block 40 is blocked from moving forward. Further, the deceleration sensor 56 resists the urging force of the coil spring 58 and moves forward (see FIG. 3) when the vehicle suddenly decelerates to a predetermined value or more.
3), the engagement with the engagement pin 52 is released, and when the engagement pin 52 moves in the direction of arrow E in FIG. 3, as shown in FIG. Engagement pin 5
2 becomes the non-holding position, the engagement between the engagement pin 52 and the block 40 is released, and the tensile force of the coil spring 50 moves the block 40 to the front end portion 24B side of the rail 24. At the same time, as shown in FIG.
Around the upper end 34A of the inner cylinder 34 as a center of rotation (see FIG.
(In the direction of the arrow G) of the outer cylinder 3
The rod 32 is extended from 6 and is extended.

Next, the operation of this embodiment will be described. In the vehicle seat 10 of the present embodiment, when a deceleration of a predetermined value or more acts on the deceleration sensor 56 during rapid vehicle deceleration, the deceleration sensor 56 resists the biasing force of the coil spring 58 and moves forward (see FIG. 3). In the direction of arrow F), the engagement with the engagement pin 52 is released. Therefore, the engaging pin 52 moves in the direction of arrow E in FIG. 3 by the tensile force of the coil spring 54, and as shown in FIG.
Is disengaged. When the engagement between the engagement pin 52 and the block 40 is released, the block 40 moves toward the front end portion 24B of the rail 24 (direction of arrow D in FIG. 3) due to the tensile force of the coil spring 50. At the same time, as shown in FIG.
As shown in FIG.
While swinging forward (in the direction of arrow G in FIG. 5) about the rotation center, the inner cylinder 34 is pulled out from the outer cylinder 36, and the rod 3
2 grows.

When the inner cylinder 34 is pulled out from the outer cylinder 36 and the rod 32 extends, each locking piece 44 slides on the wall 48B of the inner cylinder 34 and resists the biasing force of the coil spring 46. It moves in the directions of arrows B1 and B2 in FIG. On the other hand, when the once extended rod 32 tries to contract due to the forward movement of the seat back 14, each locking piece 44 contacts the wall portion 48A of the inner cylinder 34, and the inner cylinder 34 shown in FIG. The movement in the direction opposite to the arrow C direction is blocked.

Therefore, even if the occupant seated in the rear seat pushes the seat back 14 forward, the rod 32 can surely hold the seat back 14 at the rear position.

In the normal state, the other end 3 of the rod 32 is
6A is held substantially coaxially with the seat back 14 and the hinge 25 of the seat cushion 12 along the rail 24, and the rod 32 is arranged at a position along the side surface of the seat back 14. 32 is the waist of the passenger,
There is no hindrance to the movement of the arm or the like, and there is no need to adjust the length of the rod 32 during reclining.

In this embodiment, the deceleration sensor 56 as the deceleration detecting means is a mechanical sensor, but an electric sensor is used instead of the deceleration sensor 56, and an explosive is ignited by the electric sensor. Due to the gas pressure, the engagement pin 52
3 may be moved in the direction of arrow E in FIG. 3, or the block 40 may be moved forward by gas pressure.

[0029]

Since the vehicle seat of the present invention has the above-described structure, the rod does not interfere with the occupant, and has an excellent effect that the seat back can be reliably held at the rear position when the vehicle is suddenly decelerated. .

[Brief description of drawings]

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

2A is a sectional view taken along line 2-2 of FIG. 1, and FIG.
FIG. 6B is a sectional view taken along line BB of FIG.

3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is an operation explanatory diagram of FIG. 3;

FIG. 5 is a schematic side view showing a vehicle seat according to an embodiment of the present invention.

FIG. 6 is a perspective view showing a vehicle seat of a conventional example as seen obliquely from the front.

7 is a sectional view taken along line 7-7 of FIG.

[Explanation of symbols]

 10 Vehicle Seat 12 Seat Cushion 14 Seat Back 24 Rail 25 Hinge 32 Rod 34 Inner Cylinder 36 Outer Cylinder 44 Locking Piece (Stopper) 48 Ring Groove 50 Coil Spring (Drive Means) 56 Deceleration Sensor (Deceleration Detection Means)

Claims (1)

[Claims] 1. A rail provided along a front-rear direction on a side surface of a seat cushion, and an extendable and retractable end of which is rotatably connected to a side portion of a seat back and the other end of which is slidably fitted to the rail. Rod, a stopper provided on the rod for fixing the rod to an arbitrary length when the rod is extended, a deceleration detecting means for detecting a sudden deceleration state of the vehicle of a predetermined value or more, and the deceleration detection. Drive means for moving the other end of the rod forward of the vehicle along the rail when the means detects a sudden deceleration state of the vehicle of a predetermined value or more;
A vehicle seat characterized by comprising: