JPH059860Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a reclining mechanism for a car seat, and more specifically, the invention is designed to prevent the seat back from suddenly falling backwards due to the reclining operation lever being rotated inadvertently. The present invention relates to a system in which a safety mechanism configured to automatically lock an operating system is provided, and when a reclining operation is performed, the safety mechanism is first released and then the operating lever is operated.

Most recent automobile seats, especially front seats, are equipped with a reclining mechanism. This is a device that allows the seat back to be tilted backwards, and most of them have a reclining operation attached to the side of the seat cushion, as shown in Japanese Utility Model Application Publication No. 57-204943. When the lever is rotated in a predetermined direction, the engagement between the lock pawl that engages with the notch on the hinge plate of the seat bag and the notch is released, and the seat bag can be rotated. When the seat bag is tilted at a predetermined angle, a lock pawl automatically engages with one of the notches of the plate, and the seat bag is fixed in the tilted state.

However, with the conventional reclining mechanism as described above, the seat back can be rotated too easily just by moving the operating lever, so if something touches the operating lever, the seat back may not be able to move due to the occupant's will. There was a problem in which the control lever moved regardless of the situation, and the seatback could suddenly fall backwards along with the occupant seated in the seat.

This invention was devised under the circumstances mentioned above, and its purpose is to replace the conventional recliner, in which the seat back can be easily folded back by simply moving the control lever. To provide a reclining mechanism for an automobile seat which solves the problem of the mechanism and has a safety mechanism for locking an operating lever so that the operating lever cannot be operated unless the safety mechanism is first released.

In order to achieve this purpose, the present invention takes the following technical measures.

That is, the present invention includes an operating lever that is rotatably supported while being biased in the return direction by a bracket, and a lever that is supported by the bracket so as to rotate in accordance with the rotation of the operating lever in the operating direction. a driven plate; a pin that engages with a notch provided in a support portion of a seat bag supported by the bracket so as to be rotatable during reclining; the pin is always biased in a direction to engage with the notch; a reclining mechanism, comprising: a plate supported by the bracket so that the pin rotates in a direction in which the pin is removed from the notch by resisting an urging force as a result of the driven rotation of the driven plate by the operating lever; A lock plate formed into a substantially L-shape having a locking part and a pushed part is attached to the bracket so that when the driven plate is not rotated, the locking part is moved away from the driven plate. The plate is rotatably supported so as to be rotatable between a distant unlocking position and a locking position where the locking part interferes with the driven plate to prevent its rotation; A spring is provided that biases the lock plate, which is rotatable between unlocked positions, over its fulcrum, and the driven portion is pushed by the rotation of the driven plate when the lock plate assumes the unlocked position. The lock plate is rotated in the direction of the lock position by the driven plate, and the spring is configured to rotate the lock plate against the lock plate when the driven portion of the lock plate is rotated by a predetermined amount by the driven plate. It is characterized in that it is set so that the direction of movement is converted into the direction of the lock position.

The lock plate is returned to the unlocking side by manual operation by the occupant, and the operating lever is thereby unlocked. When this lock is released, the operating lever can be rotated. When this operating lever is operated, the pin plate rotates, and the engagement between the pin and the notch in the support plate of the seat bag is released, allowing the seat bag to fall backward. At this time, the pushed part of the lock plate is pushed by the rotation of the driven plate and rotated by a predetermined amount in the direction of the lock position, and at this time, a spring biases the lock plate over the fulcrum. Since the biasing direction of the lock plate is changed to the lock position direction, the pin of the pin plate engages with the other notch of the support plate, and the driven plate returns to its original position. At this time, the lock plate automatically assumes the lock position due to the elasticity of the fulcrum over-type spring whose urging direction has been changed to the lock position side as described above.

In this way, in the reclining seat mechanism of the present invention, the pin of the pin plate engages with the support plate of the seat bag, and when the seat bag stops at a predetermined rotational position, the operation lever is automatically moved. is locked, it is no longer necessary to operate the control lever toward the locked position. Moreover, before you can move the control lever to recline the seatback, you must first operate the lock plate to release the lock, so if the control lever moves inadvertently and the seatback suddenly falls backwards, the seatback may fall back. Traditional problems are solved.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

1 and 2, reference numeral 1 denotes a bracket for mounting a reclining mechanism 2, which is fixed to a seat cushion frame (not shown).
Reference numeral 3 denotes a support plate fixed to the base of one side of a seat bag (not shown), which is supported with respect to the bracket 1 so as to be able to fall backwards about a support shaft 4 . Further, the base of an operating lever 5 is rotatably supported on the same support shaft 4 that supported the support plate 3. Further, this operating lever 5 is given elasticity by a suitable spring 6 so as to return to the reference position shown in FIG. Further, the bracket 1 supports a driven plate 7 which rotates in response to the rotation of the operating lever 5, so as to be rotatable about a support shaft 8. In this example, in order for the driven plate 7 to follow the movement of the operating lever 5, a pin 9 provided on the driven plate 7 is engaged in an elongated hole 10 formed in the base of the operating lever 5.

Further, on the bracket 1, an arm-shaped pin plate 14 having a pin 13 that can be engaged with a notch 12 formed in the arcuate sliding surface 11 at the lower edge of the support plate 3 is mounted around a support shaft 15. Rotatably supported. This pin plate 1
4 is given a tendency to rotate counterclockwise in FIG. 1 by a spring 16. The pin 13 of this pin plate 14 is also constantly engaged with the hole 17 made in the driven plate 7, so that the pin plate 14 rotates following the driven plate 7.

The basic configuration of the reclining mechanism 2 has been described above. With this configuration, when the operating lever 5 is rotated in the direction of the arrow A, the driven plate 7 is rotated in the direction of the arrow P, and the pin plate 14 is further rotated in the direction of the arrow P. 2, the pin 13 disengages from the notch 12 of the support plate 3, as shown in FIG. When the support plate 3 is tilted backward from this state, the pin plate 14 is biased in the direction of the arrow q in the figure, so the pin 13 slides on the sliding surface 11 of the support plate 3, and eventually the other notches are elastically pressed. to intervene. At this time, due to the elasticity of the spring 16 that urges the pin plate 14, the pin plate 14
is automatically rotated in the direction of arrow q, the driven plate 7 is automatically rotated in the direction of arrow Q, and the operating lever 5 is automatically rotated in the direction of arrow B.

Now, in the present invention, when the pin 13 engages in the notch 12 of the support plate 3 as described above and the pin plate 14, the driven plate 7, and the operating lever 5 return to their original positions, the operating lever 5 is automatically The safety mechanism 18, which is designed to prevent rotation in the A direction, is rotated by the arrow P of the driven plate 7 when locked.
A lock plate 19 is attached to the bracket 1 so as to prevent rotation in this direction.

When the lock plate 19 is unlocked,
A pushed part 20 that is pushed by the driven plate 7 when it rotates in the direction of arrow P, and a locking part 21 that interferes with the driven plate and prevents it from rotating in the direction of arrow P when it is locked. It is rotatably supported around a shaft 22 within a range of a locked position and an unlocked position. The position shown by the phantom line in FIG. 1 is the unlocked position, and the position shown by the solid line is the locked position. This lock plate 19
The rotation angle range is such that the pushed part 20 comes into contact with the lower end of the driven plate 7 in the normal position (see the imaginary line in Figure 1), and the lower part of the arm having the pushed part 20 is in contact with the bracket. 1 by hitting the flange 23 of 1. Note that the position of the locking portion 21 is such that it does not interfere with the driven plate 7 when the lock is released as shown by the imaginary line in FIG.
It is necessary to set the lock plate 19 so that the force that causes it to rotate in the direction of arrow P is applied in the direction that causes the lock plate 19 itself to rotate in the direction of arrow R. In this way, even if the driven plate 7 tries to rotate in the direction of arrow P in FIG.
Since the driven plate 7 is supported by the flange 23 of the bracket 1 via the flange 23 of the bracket 1, the driven plate 7 cannot rotate.

Further, this lock plate 19 is biased by a spring 24 in a so-called fulcrum over type. That is, as shown in FIG. 3, a dead center b is provided in the middle of the rotation angle a between the lock position (imaginary line) and the unlock position (solid line), and the rotation angle relative to the lock plate 19 is The biasing direction is changed. For example, a spring 24 is provided that acts to elastically spread apart a certain point O1 on the bracket 1 and a certain point O2 on the lock plate 19, so that the lock plate 19 can move within the rotation angle range. This is achieved by making the point O2 on the lock plate 19 side cross the straight line l connecting the axis 22 and the point O1 on the bracket side. As a result, when the lock plate 19 is closer to the lock position than the dead center b, it tends to elastically rotate in the direction of the lock position, that is, in the direction of arrow R in FIG. At some point, it attempts to elastically rotate in the direction of the unlocked position, that is, in the direction of arrow U in FIG. Note that the dead center b should be set at a position close to the unlocked position, as shown in FIG. In this way, by just slightly rotating in the direction of arrow R from the unlocked position shown by the imaginary line in FIG. 1, the safety mechanism 17 will automatically rotate in the locking direction. This is because it increases. In addition, lock plate 19
A grip portion 25 is formed in the lock for manually rotating the lock in the unlocking direction.

Next, the operation of the safety mechanism 17 described above will be explained.

Before rotating the operating lever 5, the grip portion 25 is grasped and the lock plate 19 is rotated in the direction of arrow U in FIG. 1 to release the lock as shown by the imaginary line. At this time, the locking action 21 of the lock plate 19, which had been tensioning the driven plate 7 to prevent its rotation, no longer interferes with the driven plate 7, and the driven plate 7 can now rotate in the direction of arrow P. . This means that the operating lever 5 can also be rotated in the direction of arrow A. When the operating lever 5 is rotated in the direction of arrow A, the driven plate 7 is slightly rotated in the direction of arrow P, and this driven plate causes the driven part 20 to be rotated.
By being pushed, the lock plate 19 is rotated in the direction of the lock position, and eventually passes the dead center b and has a tendency to rotate in the direction of arrow R.

In FIG. 2, the operating lever 5 is rotated in the direction of arrow A,
The pin 13 of the pin plate 14 has come off from the notch 12 of the support plate 3, and the support plate 3 is now rotatable. At this time, the vicinity of the locking portion 21 of the locking plate 19 is elastically in contact with the end of the driven plate 7. From this state, the support plate 3 rotates, and eventually the pin 14 of the pin plate 13 engages with the notch 12 of the support plate.
Even if the operating lever 5 or the pin plate 14 return to the state shown in FIG.
has a tendency to rotate in the direction of arrow R, that is, in the lock direction, so the lock plate 19 in the state shown in FIG. 2 continues to rotate in the direction of arrow R.
As a result, the lock position shown in solid line in FIG. 1 is automatically assumed. In this way, the pin 13 of the pin plate 14 engages with the notch 12 of the rotating support plate 3, and the seat back is fixed.At the same time, the operating system of the reclining mechanism is locked, and unless this lock is released, the reclining operating lever will not move. 5 cannot be operated.

As described above, in the reclining mechanism of the car seat of the present invention, the operating system is automatically locked after the reclining operation, so the operating lever may move suddenly and against the occupant's will. The drawbacks of conventional reclining mechanisms, such as the seat back falling backwards, are eliminated. Moreover, since the operating system is configured to be automatically locked after the reclining operation, there is no chance of forgetting to lock it, and the operation is simple.

Note that the scope of the present invention is not limited to the embodiments shown in the drawings, and the specific shapes of each member are as follows:
It can be changed as appropriate. Further, although only the reclining mechanism is shown in the drawings, it goes without saying that the present invention can also be applied to a seat configured so that the seat back can be tilted forward.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment of the present invention in a normal state, and FIG. 2 is a front view in a state where the seat back can be tilted backwards by rotating the operating lever.
FIG. 3 is an explanatory diagram of the operation of the lock plate. 2... Reclining mechanism, 3... Support plate, 5... Operation lever, 7... Followed plate, 1
2...notch, 13...pin, 14...pin plate, 19...lock plate.

Claims (1)

[Claims for Utility Model Registration] An operating lever supported rotatably while being biased in the return direction by a bracket, and supported by the bracket so as to rotate as the operating lever rotates in the operating direction. and a pin that engages with a notch provided in a support portion of a seat bag supported by the bracket so as to be rotatable during reclining, and the pin is always biased in a direction to engage with the notch. and a pin plate supported by the bracket so that the pin rotates in a direction in which the pin is removed from the notch by resisting the biasing force as a result of the driven rotation of the driven plate by the operating lever; In the reclining mechanism, a locking plate formed in a substantially L-shape having a locking portion and a pushed portion is attached to the bracket so that when the driven plate is not rotated, the locking portion is The lock is rotatably supported so as to be rotatable between a lock release position remote from the driven plate and a lock position where the lock acting portion interferes with the driven plate to prevent its rotation; A spring is provided that biases the lock plate, which is rotatable between the locking position and the unlocking position, over its fulcrum. The spring is configured to rotate the lock plate in the direction of the lock position when pushed, and the spring rotates the lock plate when the pressed portion of the lock plate is rotated by a predetermined amount by the driven plate. A reclining mechanism for an automobile seat, characterized in that the direction of biasing the plate is changed to the direction of the lock position.