JPS6340694B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an emergency lock device for preventing deformation of a seat back due to an impact load in a vehicle seat using a cantilevered reclining device.

Prior Art A vehicle seat using a cantilever reclining device has a seat back 1 and a seat cushion 2 as shown in Fig. 1 (see Japanese Utility Model Application No. 56-92545).
A well-known reclining device 3 is provided only at one end of the joint hinge portion, and a rotatable pin hinge 4 is provided at the other end. Therefore, in this seat, as shown in the figure, the rear load G is applied to the occupant M due to a sudden start or secondary impact during a collision.
When this load is applied, one side of the seat bag 1 is supported by the reclining device 3, but the other side cannot be prevented from moving back in the direction shown by the broken line due to this load. There is a disadvantage in that the occupant under this load cannot be adequately supported.

As a device for avoiding such a situation, there is a double-sided reclining device shown in FIG. Both are connected by a connecting rod 7.

However, in this dual-support reclining device, the seat back is supported on both sides, so although the load-bearing performance is excellent, when adjusting the seat back to a desired angle, it is difficult to adjust the seat back to one reclining device 6 via the connecting rod 7. , the operating force of the release handle 8 is not transmitted accurately,
In addition to being disadvantageous in the adjustment operation of the seat back, there is another problem in that the connecting rod 7 presses the buttocks of the seated occupant, degrading riding performance.

Purpose of the Invention The present invention has been made by focusing on the disadvantages of each of the cantilever and both-side reclining devices, as well as the excellent features that only the both-side reclining device has. To provide an emergency locking device for a vehicle seat, in which the above problems are avoided by using a device, and the cantilevered reclining device can also obtain excellent load-bearing performance similar to the double-sided reclining device. The purpose is to

Structure of the Invention In order to achieve the above object, the present invention includes the following:
In a vehicle seat in which a reclining device is provided on one side of a joint hinge portion between a seat back frame and a seat cushion frame, a gear-shaped engagement portion is formed on the seat back frame on the other side of the joint hinge portion. While the arm is fixed, a base plate is fixed to the seat cushion frame, which is pivotally fixed to the arm at the center of the gear-shaped engagement part, and the base plate has opposing parts on both sides of the gear-shaped engagement part. A movable tooth member that is provided and engages with the engaging portion at a predetermined rotational position is pivotally fixed at one end, and a spring member that biases the movable tooth member in the meshing direction is tensioned at the other end of the movable tooth member. , an inertia weight is provided between the other end portions, and the movable tooth member is normally supported in a non-meshing state with the gear-like engagement portion, and is moved in the meshing direction by displacement accompanying the rocking of the inertia weight. An intervening body provided with a cam portion that allows rotation of the biasing member is swingably interposed therein.

Embodiments The configuration of the present invention will be described below with reference to the drawings.

As shown in FIG. 3, the seat back frame 11 embedded in the seat back 1 and the seat cushion frame 1 embedded in the seat cushion 2
A reclining device 3 is attached to one side of the hinge portion connected to the hinge portion 2, and an emergency lock device 13 is attached to the other side of the hinge portion. As shown in FIGS. 4 and 5, this emergency lock device 13 has an arm 14 fixed to the seat back frame 11, and a gear-shaped engagement portion is stamped at the lower end of the arm 14. 15 is provided, and an assembly hole 16 is provided at the center of the gear-like engagement portion 15.
is provided. 17a and 17b are arms 14 for fixing to the seat back frame 11.
This is a mounting hole formed at the upper end of the .

On the other hand, the base plate 18 is fixed to the seat cushion frame 12 through attachment holes 18a, 18a provided at the lower end, and an attachment hole 19 provided at the center is provided through attachment holes 18a, 18a provided at the lower end. 1
It is pivotally fixed by a center pin 20 that is inserted into the center pin 6. Further, in this pace plate 18, movable tooth members 21 and 22 are provided oppositely on both sides of the gear-like engagement portion 15, and one end portions 21a and 22a of the movable tooth members 21 and 22 are connected to the respective assembly holes 21b, 22b, 18b, and 18b. The movable tooth members 21, 22 have engagement pins 23, 23 which are inserted into the movable tooth members 21, 22 to engage with the gear-like engagement portion 15 at a predetermined rotational position. Matching teeth 21c and 22c are provided. Also, the other end 21 of these movable tooth members 21, 22
d, 22d have engagement grooves 24a, 25a at their tips.
Pins 24 and 25 are implanted,
Both ends of the pins 24 and 25 are connected to the engagement groove 24.
a, 25a, and the other end 21d,
22d to approach each other, that is, the direction in which the engaging teeth 21
A spring 26 is provided to bias the gears 22c and 22c in the direction of meshing with the gear-like engagement portion 15. Furthermore, between the other ends 21d and 22d of the movable members 21 and 22,
An intervening body 27 is swingably mounted by a pin 28 inserted through an assembly hole 27a provided in the intervening body 27 and an assembly hole 18c provided in the base plate 18. This intervening body 27 is a cam portion 29 located between the other end portions 21d and 22d.
and a stay 30 extending integrally with the cam portion 29.
and an inertia weight 31 fixed to the tip of the stay 30, and the cam portion 29 is in a rest position as shown by the solid line in FIG.
2c and the gear-like engaging portion 15, and a beveled end portion 29a, which allows the movable tooth members 21, 22 to rotate and engage with each other by displacement accompanying the swinging of the inertia weight 31. A shaped cam surface 29b is provided.

In this embodiment with the above configuration, the intervening body 2 is normally interposed between the other end portions 21d and 22d.
7, the movable tooth members 21, 22 are connected to the spring 26
The non-meshing state with the gear-like engaging portion 15 is maintained against the
The seat back 1 can be adjusted freely by operating the button. Next, when a shock of more than a predetermined value is applied to the inertia weight 31 due to a sudden start or a collision, the inertia weight 31 swings, the cam portion 29 is displaced, and the tip portions 29a, 29a are movable tooth members. 2
1 and 22 from the other end portions 21d and 22d.
As a result, the movable members 21 and 22 are rotated in the direction of bringing the other ends 21d and 22d closer to each other, that is, in the direction of meshing with the gear-like member 15, while slidingly contacting the cam surface 29b due to the biasing force of the spring 26. . When at least one of the movable members 21 and 22 engages with the gear-like engagement portion 15, the arm 14
is prevented from rotating about the center pin 20, and the seatback frame 11 to which the arm 14 is fixed is prevented from rotating on the side where the emergency lock device 13 is attached.

On the other side of the seat back frame 11, the reclining device 3 prevents the seat back from rotating at the adjustment position desired by the occupant, so that the seat back 1 is supported on both sides of the joint hinge. Even if an occupant is pressed against the seat back 1 and a rear load is generated, the seat back 1 will not be twisted and move backwards, and the occupant will be reliably supported, ensuring physical safety in an emergency. be.

Of course, once this emergency period has passed and the load on the seat bag 1 is reduced and the inertia weight 31 comes to rest, the cam part 29 will rotate due to the weight of the inertia weight 31, and the movable tooth member will move against the spring 26. 21, 22
Push out the other ends 21d and 22d to form the tip 29.
a, 29a, and the movable tooth members 21, 22
are maintained in a non-meshing state. Therefore, the arm 14 is
The seat back 1 can be freely rotated about the center pin 20, and as described above, the occupant can freely adjust the angle of the seat back 1 by operating the reclining device 3.

EFFECTS OF THE INVENTION As explained above, the present invention provides a gear-like engagement member provided on an arm fixed to the seat back frame when a shock of a predetermined value or more is applied to the vehicle body. The movable tooth member provided on the base plate fixedly engaged with the seat cushion frame prevents rotation of the seat cushion frame, and the reclining device provided on the other end side of the joint hinge between the seat back and the seat cushion. In addition, since the seat cushion is supported on both sides, in an emergency, the seat back can be reliably supported and the safety of the occupant can be ensured, similar to when a dual-support reclining device is used.

Therefore, considering safety in the event of an emergency, it is possible to eliminate the need to use a reclining device with both sides. This makes it possible to obtain an ideal vehicle seat while avoiding sexual disadvantages.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a vehicle seat using a conventional cantilever reclining device, FIG. 2 is a perspective view of a conventional double-sided reclining device, and FIG. 3 is an external perspective view showing an embodiment of the present invention. , FIG. 4 is a perspective explanatory view of the emergency lock device in the same embodiment, FIG. 5 is an exploded perspective view of the emergency lock device in the same embodiment, and FIG. 6 shows the operation of the intervening body according to the same embodiment. FIG. 5 is an explanatory diagram of the main part of FIG. 4; 1... Seat bag, 2... Seat cushion, 3... Reclining device, 11...
Seat back frame, 12... Seat cushion frame, 13... Emergency locking device, 14...
Arm, 15... Gear-shaped engagement portion, 18... Base plate, 20... Center pin, 21, 22...
...Movable tooth member, 26... Spring, 27... Intermediate body,
29...cam section, 31...inertia weight.

Claims (1)

[Claims] 1. In a vehicle seat in which a reclining device is provided on one side of a joint hinge between a seat back frame and a seat cushion frame,
On the other side of the joint hinge part, an arm in which a gear-shaped engagement part is formed is fixed to the seat cushion frame, and the arm is pivoted to the seat cushion frame at the center of the gear-shaped engagement part. fixing a stopped base plate, and pivotally fixing a movable tooth member at one end of the base plate, which is provided oppositely to both sides of the gear-like engaging part and meshes with the engaging part at a predetermined rotational position;
A spring member is provided to bias the other end of the movable tooth member in the meshing direction, and an inertia weight is provided between the other ends to normally prevent the movable tooth member from engaging the gear-like engagement portion. A swingably interposed intervening body is supported in a meshing state and is provided with a cam portion that allows biasing rotation of the movable tooth member in the meshing direction by displacement accompanying the swinging of the inertia weight. An emergency locking device for a vehicle seat, characterized in that: