JPH07227329A - Emergency lock apparatus for seat of vehicle - Google Patents

Abstract

PURPOSE:To enable the locking of a sheet back securely on the side of a seat cushion with a simple and light construction at a time of emergency, for example, collision of an automobile. CONSTITUTION:A lock mechanism E is so arranged between the side of a free hinge of a back frame 1 and the side of a seat cushion to perform a locking in emergency with a ring 4 provided on the side of the seat cushion through cam dog pieces 3A and 3B by the displacement of a cam 2 provided on the side of the free hinge of the back frame 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency locking device for a seat cushion (seat portion) of a seat back (back portion) in a vehicle seat (seat) such as an automobile.

[0002]

2. Description of the Related Art In a conventional general automobile seat, one side portion of a back frame which constitutes a seat back is pivoted so that the back frame can be tilted by a reclining device with respect to a cushion frame of a seat cushion or a slide rail. The other side portion of the back frame is flatly crushed and rotatably connected to a hinge bracket fixed to the cushion frame or the slide rail by a hinge pin.

On the other hand, in the conventional product, as disclosed in, for example, Japanese Utility Model Laid-Open No. 63-52448, the other side portion of the back frame and the cushion frame are linked to the reclining device. There is a so-called double-sided lock system in which a reclining device for unlocking is provided.

[0004]

The former back frame having a reclining device on one side is a structure that is locked by the reclining device provided on one side. Therefore, if a load in the front-rear direction is applied to the back frame in an emergency such as an automobile collision, the free hinge side, which is the other side portion of the back frame, may be deformed, and the entire seat back may be deformed in the front-rear direction. In order to eliminate such a defect, the free hinge side is reinforced, so that there is a drawback that weight reduction which causes an increase in weight cannot be achieved. On the other hand, in the latter type having a reclining device on both sides, both sides of the back frame are locked, so that the left and right reclining devices have poor synchronism and increase in weight.

Therefore, according to the present invention, one side portion of the back frame constituting the seat back is connected to the seat cushion side via the reclining device, and the other side portion of the back frame is rotated to the seat cushion side via the shaft. An object of the present invention is to prevent a seat back from being deformed in the event of an emergency by making a structure of a vehicle seat movably attached to a shaft so that the structure is simple and lightweight.

[0006]

In order to achieve the above object, an emergency locking device for a vehicle seat according to the present invention is provided with a back which occurs in an emergency between the other side portion of the back frame and the seat cushion side. A lock mechanism for locking by displacement of the other side portion of the frame is provided, and the lock mechanism includes an elliptical cam long in the front-rear direction fixed to a shaft attachment portion of the shaft on the other side portion of the back frame, and the seat cushion side. A ring that is fixed to a standing piece that is fixed to the inside of which the shaft is inserted, and a cam biting piece that is located inside the ring and that is fixed to the shaft and that has the cam inside. It will be.

[0007]

In an emergency such as a car collision, the other side portion of the back frame is displaced in the front-rear direction by the load in the front-rear direction. Due to this displacement, the cam integrated with the other side portion of the back frame rotates and bites into the cam biting piece,
The cam bite crushes into the ring on the seat cushion side.
As a result, the other side portion of the back frame is locked to the seat cushion side.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show a first embodiment of the present invention,
In the drawing, (1) is a pipe-made back frame of a seat back, and one side portion of the back frame (1) is an upper rail in a slide rail (9) on a seat cushion side by a reclining device (RD) having a conventionally known structure. It is connected to the (90) side. A bracket (1A) is welded to the other side portion of the back frame (1), and the bracket (1A) and the standing piece (93) integral with the upper rail (90) of the slide rail (9) are the shaft. (R) is rotatably connected to the shaft (R), and the bracket (1
A lock mechanism (E) that locks due to the displacement of (A) in an emergency is provided. In the figure, (91) indicates a lower rail that constitutes the slide rail (9).

The lock mechanism (E) is fixed to the cam (2) welded to the shaft attachment portion of the bracket (1A) provided on the other side of the back frame (1) and the upright piece (93), and is internally fixed. A ring (4) for inserting one end (52) of the shaft (R), and a ring (4) located inside the ring (4) and fixed to the one end (52) of the shaft (R) and internally having the cam (4). The cam biting pieces (3A) and (3B) are formed by arranging 2) at intervals.

The cam (2) is composed of an elliptical plate long in the front-rear direction, and one end (52) of the shaft (R) is rotatably inserted in the center. Shaft (R)
One end portion (52) of the above is integrally connected to the shaft (R) by a stop pin (53). In the figure (52A) (5
2B) shows a connecting hole for inserting the stop pin (53).

The shaft (R) uses a conventional two-sided reclining type connecting rod. When the seat back is tilted by the reclining device (RD), the shaft (R) is accompanied by a back frame ( It is mounted so that it can move together with 1). The one end portion (52) integrally connected to the shaft (R) is provided with the upright piece (93) and the bracket (1).
A) rotatably and pivotally attached to one end (52)
A fixing piece (5) for fixing the cam biting pieces (3A) and (3B) is integrally welded to the. The fixing piece (5) includes an annular plate (51) and locking projections (50) (5) integrally formed on one surface of the annular plate (51).
0) and.

The ring (4) is welded to the upright piece (93), and the cam biting pieces (3A) (3) are attached to the inner surface (40) of the ring (4).
B) is configured to come into pressure contact with the rotation of the cam (2). Therefore, the inner surface (40) of the ring (4) is subjected to uneven anti-slip processing such as flat knurls so that the cam biting pieces (3A) (3B) that are in pressure contact can be reliably locked. preferable. In the figure (93A) is the shaft (R)
The through hole which inserts one end part (52) of is shown.

The cam biting pieces (3A) (3B) are a synthetic resin, a rubber, and a metal plate composed of a pair of left and right substantially arcuate plates, the outer peripheral surface of which is pressed against the inner surface (40) of the ring (4). The cam (2) is configured to bite into the inner peripheral surface, and each end of the cam (2) engages with the locking projection (50) of the fixing piece (5).
It is attached to the annular plate (51) so that it abuts (50). Therefore, since the fixing piece (5) is integrally fixed to the one end portion (52) of the shaft (R),
The cam biting pieces (3A) (3B) rotate together with the shaft (R). In the figure, (54) is one end (5
The nut for bracket (1A) attachment fastened to 2) is shown.

FIG. 3 shows a state before the lock mechanism (E) is actuated. The cam biting pieces (3A) (3B) are integrated with the shaft (R), and the shaft (R) is as described above. Since it rotates with the back frame (1), when the seat back is tilted by the reclining device (RD), the cam (2) also rotates in the same direction together with the cam biting pieces (3A) (3B). Therefore, the cam (2) is replaced by the cam biting piece (3
A) Lock mechanism (E) because it does not get caught in (3B)
Does not work.

FIG. 4 shows a state in which the lock mechanism (E) is activated in an emergency such as a collision of an automobile. When one side portion of the back frame (1) is locked by the reclining device (RD), the shaft ( R) is fixed,
The free hinge side, which is the other side of the back frame (1), receives the load in the emergency. Therefore, the cam (2) on the free hinge side is displaced (rotated) by this load,
As shown in FIG. 4, it bites into the cam biting pieces (3A) (3B) provided on the fixed shaft (R) side, and the cam biting pieces (3A) (3B) are attached to the inner surface of the ring (4). (40) is pressed and locked as shown in FIG. As a result, the free hinge side of the back frame (1) is locked.

FIGS. 6 to 8 show a second embodiment of the present invention, in which the reinforcing rod (11A) is extended from one side portion of the back frame (1) toward the other side portion thereof. The connecting shaft (13) for connecting the one end portion (52) of the shaft (R) in the above embodiment to the reinforcing rod (11A) integrally welded to the mounting bracket (12). ) Is provided, the same reference numerals as those in the first embodiment indicate the same members, and the description thereof will be omitted.

The above-mentioned mounting bracket (12) is arranged inside the upright piece (93) and integrally connects the connecting shaft (13) and the one end portion (52) with a stop pin (14). . In the figure, (14A) shows a through hole for the stop pin (14).
Therefore, the one end portion (5) that constitutes the lock mechanism (E ′) is
2) is integrally connected to one side portion of the back frame (1) and operates similarly to the first embodiment. Therefore, in an emergency, the free hinge side, which is the other side portion of the back frame (1), is locked by the lock mechanism (E ′) and the one side portion of the back frame (1) is reclining device (RD) due to the applied load. Lock by.

As described above, one end (5) of the shaft (S) is
By fixing 2) to the mounting bracket (6) of the reinforcing rod (11A), the shaft (93) is provided on the upright piece (93) provided between the left and right slide rails (9) (9) as in the first embodiment. Since R) is not required to be stretched, the seat sewing process and structure are simplified, and since the shaft (R) is not provided, the riding comfort is not impaired.

In each of the illustrated embodiments, the upright piece (93) is provided on the slide rail (9) for fixing the seat cushion, but the upright piece (93) may be provided on the cushion frame of the seat cushion. .

[0020]

According to the present invention, the free hinge side is locked to the seat cushion side by utilizing the displacement of the free hinge side due to the load applied to the free hinge side of the back frame in an emergency such as a collision of an automobile. Therefore, the structure is extremely simple and lightweight, and the free hinge side of the back frame can be accurately locked. In addition, in the locked state, the cam provided on the free hinge side locks to the ring on the seat cushion side via the cam biting piece, improving the lockability and weak rigidity such as aluminum alloy, synthetic resin, etc. You can use a back frame made of lightweight material.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the same main part.

FIG. 3 is a cross-sectional view showing a state before the lock mechanism is locked.

FIG. 4 is a cross-sectional view showing a locked state of the lock mechanism.

FIG. 5 is a vertical sectional side view of a main part of the first embodiment.

FIG. 6 is an exploded perspective view showing a second embodiment of the present invention.

FIG. 7 is an exploded perspective view of the same main part.

FIG. 8 is a vertical sectional side view of the same.

[Explanation of symbols]

 E Lock mechanism E'Lock mechanism RD Reclining device 1 Back frame 2 Cam 3A Cam biting piece 3B Cam biting piece 4 Ring 52 Shaft

Claims (5)

[Claims] 1. A side portion of a back frame constituting a seat back is connected to a seat cushion side through a reclining device, and the other side portion of the back frame is rotatably attached to a seat cushion side via a shaft. In the vehicle seat to be worn, a lock mechanism is provided between the other side portion of the back frame and the seat cushion side, the lock mechanism being locked by the displacement of the other side portion of the back frame that occurs in an emergency. On the shaft attachment part on the other side of the frame,
A fixed elliptical cam that is long in the front-rear direction, a ring that is fixed to the upright piece that is fixed to the seat cushion side, and inserts the shaft inside, and a ring that is positioned inside the ring and is fixed to the shaft. An emergency locking device for a vehicle seat, comprising a cam biting piece in which the cam is arranged. 2. The emergency locking device for a vehicle seat according to claim 1, wherein the shaft is integrated with a hinge pin of the reclining device and is rotated by tilting of a back frame. 3. The emergency locking device for a vehicle seat according to claim 1, wherein the shaft is integrally fixed to a reinforcing rod extending from one side portion of the back frame toward the other side portion via a mounting bracket. . 4. The emergency locking device for a vehicle seat according to claim 1, wherein a fixing piece for fixing the cam biting piece is fixed to the shaft. 5. The emergency locking device for a vehicle seat according to claim 3, wherein the mounting bracket is arranged inside the upright piece of the shaft.