JPH042584Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a seat reclining device that can tilt the backrest forward until it is almost horizontal, and can also tilt it back until it is fully flat. It is something.

[Conventional technology]

With conventional reclining devices, the backrest can only be tilted forward by about 45 degrees at most. This is because when the backrest is tilted backwards, it is designed so that there is no step between the seating surface of the backrest and the seating surface of the seat, creating a continuous flat surface. This is because when the seat was tilted forward, the lower end of the backrest collided with the rear end of the seat, making it impossible to tilt the backrest forward beyond a certain angle. For seats that do not take into account the backward tilt of the backrest, by designing the center of rotation of the backrest above the seat seating surface, the backrest can be tilted forward to a horizontal position. If the backrest was tilted backwards, the seating surfaces of the backrest and the seat would not be continuous and would create a step, making it impossible to use the seatback when the backrest was tilted backwards.

Japanese Patent Laid-Open No. 50-138528 discloses a device that makes the backrest fully flat when tilting forward or backward.
The one described in the publication No. 1 is known. The arm consists of a seatback bracket and a support frame, the seatback bracket is fixed to the side of the backrest, the upper end of the support frame is rotatably attached to the lower end of the seatback bracket, and the lower end of the support frame is It is rotatably attached to the seat back bracket.
Further, a ratchet is fixed to the seat back bracket, and an L-shaped pole is rotatably attached to the support frame, and when the engaging part of the pole engages with the engaging part of the ratchet, the seat back bracket and the support frame are connected. are integrated and the normal reclining function works. When the backrest is tilted forward and the pole spindle is rotated using the operating lever, the engagement parts are disengaged and the attachment point between the seatback bracket and the support frame is removed. The seatback bracket is now bendable.

[Problem to be solved]

In the conventional example of the above-mentioned structure, since a ratchet and a pole are used, a certain level of accuracy is required for the parts that engage and disengage, which makes machining and installation positioning troublesome, and it is difficult to simplify the structure. There was a lot of room for improvement in terms of weight reduction. Furthermore, it was necessary to form a square shaft part on the main shaft of the support frame so that it would not easily disengage when the backrest was tilted forward in an upright position, making the structure even more complicated. .

Therefore, this idea was developed to create a seat reclining device that can tilt the backrest forward and keep its back surface almost horizontal no matter what position the backrest is in, and which can reduce weight and cost with a simple structure. The purpose is to provide.

[Means for solving problems]

In order to achieve the above object, this invention has the lower end of the first arm rotatably attached to a base plate fixed to the side of the seat of the seat, and the upper end of the first arm fixed to the side of the backrest of the seat. The lower end of the second arm is rotatably attached, a lock groove is formed at the lower end of the second arm, an engagement groove is formed at the upper end of the base plate, and the first arm has a hook whose end engages with the lock groove. The middle part of the first link is rotatably attached, the upper end of the first link is rotatably attached to the end opposite to the end that engages with the locking groove of the hook, and one end of the short link is attached to the lower end of the first link. The middle part of the engaging member whose engaging end engages with the engaging groove is rotatably attached to the first arm, and between the rotation center of the engaging member and the engaging end. The upper end of the second link is rotatably attached to the second link, one end of the short link is rotatably attached to the lower end of the second link, the other ends of the two short links are rotatably attached to the base plate, An operating lever equipped with an operating pin that abuts the lower surface of one end of the two short links is rotatably mounted on the base plate, and biasing means is provided for biasing the hook and the engaging member in the direction in which they are respectively engaged. It is something.

[Effect]

In this design, if one of the short links is rotated using the operating pin provided on the operating lever, the engagement member and the hook are disengaged, allowing the entire backrest to rotate and the second arm to freely rotate. Become. Further, in this invention, no matter what position the backrest is in, only the second arm can be rotated forward by rotating the short link to which the first link is attached.

〔Example〕

Preferred embodiments of this invention will be described below with reference to the drawings.

A base plate 3 is fixed to the side surface of the seat portion 1 of the seat, and the lower end of the first arm 4 is rotatably attached to the base plate 3. The lower end of a second arm 5 fixed to the side surface of the seat back 2 is rotatably attached to the upper end of the first arm 4, and lock grooves 6 and 7 are formed in the lower end of the second arm 5. It has been done. End portion 8A that engages with these lock grooves 6 and 7
An intermediate portion of a hook 8 having a diameter is rotatably attached to the first arm 4. The upper end of the first link 9 is rotatably attached to the end opposite to the end 8A, and the lower end of the first link 9 is rotatably attached to one end of the short link 10. The other end of this short link 19 is overlapped with the other end of the short link 11 whose one end is rotatably attached to the lower end of the second link 12, and these other ends are rotatably attached to the base plate 3. be. In the embodiment shown in FIG. 1, holes are formed where two short links 10 and 11 are overlapped, holes are also formed in the base plate 3 corresponding to these holes, and holes are connected to these holes. A rod 13 is rotatably inserted therethrough. This connecting rod 13
is a member for interlocking when a similar mechanism is provided on the opposite side of the seat. Base plate 3
Engagement grooves 14, 15, and 16 are formed in the upper end surface, and the intermediate portion of the engagement member 17 is provided with an engagement end portion 17A that engages with these engagement grooves 14, 15, and 16. 1 is rotatably attached to arm 4. The upper end of the second link 12 is rotatably attached between the center of rotation of the engaging member 17 and the engaging end portion 17A. The hook 8 and the engaging member 17 are connected at their free ends by a tension spring 18, as shown in FIG.

Assuming that the center of rotation between the base plate 3 and the first arm 4 is A, the lock at this point is the engagement member 17.
If the center of rotation of the first arm 4 and the second arm 5 is B, the locking at this point is performed by the hook 8. The locking and release at these two locations (A, B) are achieved by the operating member 19. This operating member 19 is rotatably mounted at a rotation center A, and is connected to an operating pin 20 that abuts the lower surface of one end of the short link 10.
1, and an actuating pin 21 that comes into contact with the lower surface of one end of the actuator 1. Operating pins 20, 2 of this operating lever 19
A spring 22 is provided between the operating lever 19 and the rotation center A so that the lever 1 always returns to the neutral state. The operation lever 19 is attached to the base plate 3 using attachment pins 23. The mounting pin 23 rotates together with the operating lever 19 and freely rotates within the holes of the short links 10 and 11, and the rotational force of the mounting pin 23 is transmitted to the connecting rod 13. Although not shown, it goes without saying that similar holes are formed at locations corresponding to the holes in the short links 10 and 11 of the first arm 4.

Next, the operation of this embodiment will be explained.
When the operating lever 19 is rotated counterclockwise in FIG. 1, the operating pin 21 raises one end of the short link 11, thereby raising the second link 12.
When the second link 12 rises, the engagement member 17
Rotate counterclockwise in the figure to remove the engaging end 17A from the engaging groove 15. The engagement end 17A is the engagement groove 15
When the first arm 4 is removed from the base plate 3, the first arm 4 becomes rotatable about the rotation center A with respect to the base plate 3. When the rotation center A is free to rotate, the backrest part 2
It is also possible to tilt backward to bring it into the state shown by the dashed line in FIG. 4, that is, the fully flat state. If the force applied to the operating lever 19 is released in this state, the engagement member 17 will rotate clockwise by the tension spring 18, and its engagement end 17A will engage with the engagement groove 16. If the backrest portion 2 is tilted forward in a state in which the engagement by the engagement member 17 is released, it will temporarily stop in the state shown by the two-dot chain line in FIG. 4. In this state, the engagement end 17A of the engagement member 17 is in the engagement groove 1.
4. From this state, the backrest part 2
To tilt forward, the operating lever 19 is rotated clockwise, and the operating pin 20 rotates one end of the short link 10 upward, thereby raising the first link 9 and rotating the hook 8 clockwise. let When the hook 8 is rotated clockwise, its end 8A is removed from the engagement groove 7. When the end portion 8A is disengaged from the engagement groove 7, the second arm 5 becomes rotatable about the rotation center B. If the backrest is tilted forward in this state, it can be tilted to the state shown by the chain line in FIG. 4, that is, to a substantially horizontal state. Note that when the backrest portion 2 is tilted forward to the state shown by the two-dot chain line in FIG. 4, the lock of the hook 8 is not released. It is also possible to tilt forward until it is almost horizontal.
Furthermore, a return spring is attached to the first arm 4, and when the engagement by the engagement member 17 is disengaged, the first arm 4 is biased so that it always falls forward about the rotation center A. It is also possible to keep it.

〔effect〕

As explained above, according to this invention, the backrest can be tilted forward in any position and its back surface can be kept in a nearly horizontal state, and the backrest can be tilted backward to create a fully flat state. It is also possible to do this. Moreover, with this invention, it is possible to achieve weight reduction and cost reduction with a simple structure. Furthermore, the two rotation centers can be unlocked so as to be rotatable using one operation lever, which reduces the possibility of erroneous operation.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing a preferred embodiment of this invention, Figure 2 is a front view showing only the respective locking points, Figure 3 is an explanatory diagram showing the relationship between the operating lever and the short link, and Figure 4. FIG. 3 is a side view showing the operating state. DESCRIPTION OF SYMBOLS 1... Seat part, 2... Backrest part, 3... Base plate, 4... First arm, 5... Second arm, 6,
7... Lock groove, 8... Hook, 8A... End,
9...First link, 10,11...Short link, 1
2...Second link, 14, 15, 16...Engagement groove, 17...Engagement member, 17A...Engagement end, 1
8... tension spring (biasing means), 19... operating lever, 20, 21... operating pin.

Claims (1)

[Scope of claim for utility model registration]
The lower end of the arm is rotatably attached, the lower end of the second arm fixed to the side of the seat back is rotatably attached to the upper end of the first arm, a locking groove is provided at the lower end of the second arm, and a lock groove is provided on the base plate. An engaging groove is formed in each of the upper ends, the middle part of the hook whose end engages with the lock groove is rotatably attached to the first arm, and the middle part of the hook with the end that engages with the lock groove of the hook and the opposite end thereof is rotatably attached to the first arm. The upper end of the first link is rotatably attached to the end, one end of the short link is rotatably attached to the lower end of the first link, and the engaging end engages with the engaging groove in the first arm. The middle part of the member is rotatably attached, the upper end of the second link is rotatably attached between the rotation center of the engaging member and the engaging end, and one end of the short link is attached to the lower end of the second link. is rotatably mounted, the other ends of the two short links are rotatably mounted on the base plate, and the operation is such that the base plate contacts the bottom surface of one end of the two short links at the center of rotation with the first arm of the base plate. A seat reclining device in which a control lever equipped with a pin is rotatably mounted, and a biasing means is provided for biasing a hook and an engaging member in a direction in which they are respectively engaged.