JPS6030098Y2 - Seat back reversing device locking mechanism - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is used in passenger cars, etc., to move the position of the seat back relative to the seat cushion forward so that the seat can face the person in the rear seat. The seat back reversing device enables the user to sit on the seat, and more specifically, it includes a rigid base plate attached to both sides of the frame directly below the seat cushion, a movable bracket attached to both sides of the seat back, and one end of the movable bracket attached to the seat back. The present invention relates to a locking mechanism for a seatback reversing device, which comprises a pair of links that are pivotally connected and have the other end pivotally connected to the base plate.

[Conventional technology]

In conventional seatback reversing devices of this type, locking means are provided at two locations on the base plate to lock the seatback, and the locking means has a large number of parts, resulting in a large device. There was a problem that assembly workability was poor.

[Purpose of invention]

This idea was devised in view of the problems mentioned above.
The purpose is to provide a locking mechanism for a seatback inversion device that is easy to assemble and allows for miniaturization of the device.

[Structure of the idea]

The technical means configured to achieve the above object includes a base plate attached to the frame on the seat cushion side, a movable bracket attached to the seat back side, one end of which is pivotally attached to the movable bracket, and a base plate attached to the frame on the seat cushion side. In a seat back reversing device comprising a pair of links whose other ends are pivotally connected, the links abut each other at each inverted position of the seat back, and a striker pin that restricts further rotation of the link is attached to the frame. A locking lever, which is fixed to each of the striker pins and selectively engages with one of the striker pins, is attached to the movable bracket in a state where it is always biased to rotate in the locking direction. Located in the locking mechanism of the device.

〔Example〕

Hereinafter, one embodiment of this invention will be described in detail with reference to the drawings.

1 and 3, reference numeral 101 denotes a frame composed of an iron pipe on which a seat cushion (not shown) is placed, and this frame 101 has a quadrilateral upper pipe section 10.
2, and U welded to the front and rear four corners of this upper pipe section 102.
It consists of a letter-shaped front leg part 103 and a rear leg part 104.

A base plate 1 having an angled cross-section is attached to both sides of the upper pipe 102 so as to face downward.

Further, a striker pin 6.7, which is engaged with a locking lever 13 to be described later, is welded horizontally and outwardly at a predetermined position on the inner side of the front leg part 103 and the rear leg part 104.

Next, 2 and 3 are a pair of links of the same shape, and 4.5 is a flanged pin.

These pins 4 and 5 are connected to the through holes 1a and lb of the base plate 1.
The link 2.3 is inserted into the through holes 2a and 3a at the lower end of the link 2.3 and then caulked.

The lower ends of the links 2 and 3 are pivotally connected to the base plate 1 by the pins 4 and 5.

8 is a movable bracket attached to both sides of the seat back, which includes a lower bracket 9 and an upper bracket 1.
It is composed of 0.

A reclining device that can freely adjust the inclination angle of the upper bracket 10 with respect to the lower bracket 9 is attached to the movable bracket 8.

Reference numerals 11 and 12 designate flanged pins inserted into the through holes 2C93C at the upper ends of the rings 2 and 3 and the through holes 9a and 9b of the lower bracket 9, respectively.

The pins 11, 12 are caulked after the insertion, whereby the upper ends of the links 2, 3 are pivotally connected to the lower bracket 9, that is, the movable bracket 8.

This lower bracket 9, the base plate 1, and the pair of links 2 and 3 form a four-joint rotating chain.
, lb, the length of each link is selected such that the interval between the links is the shortest.

13, as shown in FIG. 2, a locking lever 14 having a retaining groove 13a that engages with the striker pin 6.7;
is a spring; one end of this spring 14 is hooked to the through hole 9C of the lower bracket 9, and the other end is hooked to the through hole 13b of the locking lever 13, and the locking lever 13 is always held in the locking direction. , which biases the rotation.

Reference numeral 15 designates a flanged pin that is loosely inserted into the spring 14 and the through hole 9b of the lower bracket 9. By inserting the pin into the through hole 13c of the locking lever 13 and crimping it, the locking lever 13 and the spring 14 can be connected to the lower bracket 9. It is installed at the center of the lower side of the .

Reference numeral 16 denotes a stopper pin press-fitted into the through hole 9e of the lower bracket 9. This pin 16 abuts against the back surface of the protrusion 13d of the locking lever 13, thereby determining a stable position of the locking lever 13.

Numeral 17 is a bundle for operating the reclining device, and by rotating this bundle 17, the upper bracket 10 can be adjusted to any inclination angle with respect to the lower bracket 9.

[Effect]

The operation of this device constructed as described above will now be described.

First, at position t in FIG. Even if a force is applied to cause the link 2 to fall backward, that is, a force that rotates the link 2 clockwise in the figure, the movable bracket 8 will not move in that direction.

Conversely, even if a force is applied to the movable bracket 8 to cause it to fall forward, that is, a force to rotate the link 2 counterclockwise in the figure, the locking lever 13 and the striker pin 6 will not engage. Therefore, the movable bracket 8 does not move in the opposite direction either.

Here, the movable bracket 8 is kept in a locked state.

Next, a case will be described in which the seat back is inverted relative to the seat cushion.

At this time, the locking lever 13 is rotated counterclockwise against the biasing force of the spring 14, and the striker pin 6
What is necessary is to disengage the locking lever 13 and push the movable bracket 8 forward together with the seat back.

Here, in the above-mentioned four-bar rotation chain, since the base plate 1 is the shortest link, the four-bar rotation chain operates as a double crank mechanism.

Therefore, the movable bracket 8 moves in an arc in the direction of the arrow in FIG. 1, and also rotates counterclockwise.

As a result of this movement, the movable bracket 8 moves to the position shown by ■ in FIG. It engages and stops.

Therefore, even in the reversed position, the movable bracket 8 remains locked.

To return the movable bracket 8 to its pre-inversion position again, rotate the locking lever 13 counterclockwise to disengage it from the striker pin 7 and push the movable bracket 8 backward together with the seat back. Just return it.

[Effects of Examples]

In the case of the embodiment of this invention, when the striker pin 6°7 is brought into contact with the links 2 and 3 at each front and rear position, the angles θ1 and θ2 formed between the links 2 and 3 and the horizontal plane (see Fig. 1)
The mounting position of the striker pin 6.7 is selected so that θ1=02.

Therefore, the inclination angle of the movable bracket 8 before and after the seat back is inverted, that is, the inclination angle of the seat back becomes equal.

Therefore, in this embodiment, there is no need for the trouble of adjusting the tilting angle of the lower bracket 9 of the movable bracket 8 and the upper bracket 10, which is rotatably connected to the lower bracket 9, each time the movable bracket 8 is reversed.

In other words, this embodiment has the advantage that the recliner bundle 17 does not have to be operated every time the seat back is inverted.

In addition, although the case where the reclining device was attached to the movable bracket 8 was described in the above description, this reclining device is not necessarily necessary.

Also, the lengths of the links 2 and 3 and the striker pin 6.
There is no need to limit the mounting position 7 to that of the above embodiment.

[Effect of idea]

As explained above, this invention has a simple structure in which each striker pin is fixed at a key point on the frame, and a single locking lever that is rotatably biased in one direction is attached to the center of the lower side of the movable bracket. The movable bracket of the seat back can be locked before and after reversal using only the - number of locking levers.

Therefore, it is possible to obtain a locking mechanism for a seat back reversing device that is easy to assemble to a seat, has a small number of component parts, is thin overall, and is downsized.

Further, since each striker pin fixed to the frame is also used as a stopper for the link at each tilted position, there is no need to provide a separate stopper, and the structure is further simplified.

[Brief explanation of drawings]

Fig. 1 is a side view showing one embodiment of the seatback reversing device according to this invention, Fig. 2 is an exploded perspective view of Fig. 1, and Fig. 3 is an exploded perspective view of Fig. 1.
The figure is a perspective view showing the main parts of the frame. 1... Base plate, 2, 3... Link, 6.7... Striker pin, 8...
...Movable bracket, 9...Lower bracket,
10... Upper bracket, 13... Middle lever, 14... Spring, 16...
...Stopper pin, 17...Bundle, 1
01...Frame.

Claims (1)

[Scope of utility model registration request] A seatback inversion device consisting of a base plate attached to a frame on the seat cushion side, a movable bracket attached to the seat back side, and a pair of links having one end pivotally attached to the movable bracket and the other end pivotably attached to the base plate. In the device, striker pins that come into contact with the links at respective inverted positions of the seat back and restrict further rotation of the links are fixed to the frame, and the striker pins are selectively attached to either one of the striker pins. a locking lever that engages the
A locking mechanism for a seatback inversion device, characterized in that the locking mechanism is attached to the movable bracket in a state where it is always biased to rotate in a locking direction.