JPH042583Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a seat reclining device that allows the back of the seat to be tilted forward and the back of the seat to be used as a table or the like.

[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 locking 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 end of the second arm engages with the locking groove. The middle part of the hook is rotatably attached, a protruding pin is formed between the center of rotation of the hook and the end part, and the elongated hole formed at the upper end of the first link is fitted into the protruding pin, and the first link is closed. One end of the connecting link is rotatably attached to the lower end of the connecting link, the upper end of the second link is rotatably attached to the other end of the connecting link, and the engaging end engages the engaging groove in the first arm. The middle part of the member is rotatably attached, a protruding pin is formed at the end of the engaging member, and a long hole formed at the lower end of the second link is fitted into the protruding pin, thereby connecting the hook and the engaging member. A biasing means is provided for always biasing the link to rotate in the direction of engagement, and an operating lever for swinging the link is attached to the connecting link.

[Effect]

In this invention, by rotating the operating lever in one direction, the connecting link is rotated, for example, counterclockwise, and the protruding pin is pushed down at the end of the elongated hole of the second link, and the engaging end of the engaging member is pressed down. By releasing the engagement with the engagement groove and rotating the operating lever in the other direction, for example, the connecting link is rotated clockwise, and the protruding pin is pulled down at the end of the elongated hole of the first link. This allows the end of the hook to be removed from the locking groove. No matter what position the backrest is in, it is also possible to tilt the backrest forward to a horizontal position by freeing the rotation centers of the first and second arms by operating the operating lever.

〔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,
The lower end of the first arm 4 is rotatably attached to the base plate 3. A second arm 5 is attached to the upper end of the first arm 4 and is fixed to the side surface of the backrest portion 2 of the seat.
The lower end of is attached so that it can rotate. 2nd arm 5
Lock grooves 6 and 7 are formed at the lower end of the base plate 3.
Engagement grooves 8, 9, and 10 are formed at the upper end of the holder.
An intermediate portion of a hook 11 whose end portions 11A engage with lock grooves 6 and 7 is rotatably attached to the first arm 4. The first arm 4 also has engagement grooves 8, 9, 1
The intermediate portion of the engagement member 12, which the engagement end 12A engages with, is rotatably attached to the engagement member 12. A projecting pin 13 is formed between the rotation center x of the hook 11 and the end portion 11A. A protruding pin 1 is provided between the rotation center y of the engaging member 12 and the end opposite to the engaging end 12A.
4 is formed. Hook 11 and engaging member 12
The ends opposite to the respective engaging ends are connected by a tension spring 15, and bias the end 11A and the engaging end 12A in the direction of engagement. A long hole 17 formed at the upper end of the first link 16 is fitted into the protruding pin 13. A long hole 19 formed at the lower end of the second link 18 is fitted into the protruding pin 14 . 1st link 16 and 2nd link
It is connected to the link 18 by a connecting link 20.
That is, one end of the connecting link 20 and the first link 1
The lower end of the link 6 is rotatably attached, and the other end of the connecting link 20 and the upper end of the second link 18 are rotatably attached. The connecting link 20 is rotatably attached to the first arm 4.
An operating lever 21 is attached to the rotation center of the 0.
By rotating the operating lever 21 left and right, the connecting link 20 is also rotated left and right. In the embodiment shown in FIG. 1, since the same mechanism is provided on both sides of the seat and is configured to be interlocked by the connecting rod 22, a hole is formed in the first arm 4 at a location corresponding to the hole at the center of rotation of the connecting link 20. form,
A pin 24 of the interlocking link 23 is rotatably inserted into this hole, and a nut 25 for attaching the operating lever 21 to the connecting link 20 is fixed to the tip of the pin 24. As a result, the left and right rotation of the operating lever 21 and the connecting link 20 is transmitted to the pin 24. The interlocking link 23 is provided with a pin 26, which is inserted into an elongated hole 28 formed in the other interlocking link 27. Another interlocking link 27 is rotatably attached to a mounting shaft 29 that rotatably attaches the base plate 3 and the first arm 4, and a connector 30 is connected to the connecting rod 22. The connecting rod 22 is configured to rotate via these two interlocking links 23 and 27.

The embodiment shown in FIG. 1 has the same mechanism on both sides and is configured to be interlocked, but when operating the mechanism on only one side, the connecting link 20 is connected to the first arm as shown in FIG. 4, and projections 21A and 21B are attached to the operating lever 21 whose rotation center is the same as the rotation center of the connecting link 20.
These projections 21A and 21B may be fitted into grooves 20A and 20B formed in the connecting link 20. Operation lever 21 to connecting link 20
For attachment, the connecting link 20 may be rotated left and right in synchronization with the left and right rotation of the operating lever 21, and various means can be used for this purpose. The connecting link 20 and the operating lever 21 may be integrally constructed.

To explain the operation of the embodiment configured in this way, when the operating lever 21 is rotated counterclockwise in the drawing, the connecting link 21 is also rotated counterclockwise, pushing down the second link 18, and closing the second link 18. 18
The protruding pin 14 is pushed down by the end of the elongated hole 19. When the protruding pin 14 is pushed down, the engagement member 12 rotates counterclockwise about the rotation center y, and the engagement end 12A is disengaged from the engagement groove 9. In this state, the backrest portion 2 can be tilted forward or backward. When the final tilting state shown in FIG. 4 is reached by the dashed line in FIG.
The engagement groove 10 is engaged with the engagement groove 10 by this action.
When the engagement member 12 is disengaged and the backrest portion 2 is tilted forward, the engagement end 12A of the engagement member 12 is engaged by the action of the tension spring 15 when the operating force of the operating lever 21 is released. It will engage with the matching groove 8. This state is shown by the two-dot chain line in FIG. 4. To tilt the backrest portion 2 forward, rotate the operating lever 21 clockwise and release the connecting link 2.
0 in the same way, rotate the first link 16 clockwise.
, and push down the protruding pin 13 at the end of the elongated hole 17, so that the end 11A of the hook 11 is locked into the locking groove 7.
come off from If the backrest portion 2 is tilted forward with the end portion 11A disengaged from the lock groove 7, the second arm 5
rotates forward around rotation center B. Free rotation about the rotation center B is possible not only when the backrest portion 2 is in the state shown by the two-dot chain line in FIG. 4, but also when it is in the state shown by the solid line. Note that the rotation of the operating lever 21 in either the left or right direction is transmitted to the interlocking link 23 via the nut 25, the operation of the interlocking link 23 is transmitted to the interlocking link 27 via the pin 26, and the operation of the interlocking link 27 is transmitted to the interlocking link 27 via the pin 26. is transmitted to the interlocking rod 22 via the joint 30.

〔effect〕

As explained above, in this invention, the unlocking at the center of rotation between the base plate and the first arm and the unlocking at the center of rotation between the first arm and the second arm are performed separately using one lever. It is also possible to rotate only the second arm no matter what position the backrest is in, and since the two rotation centers are unlocked using either the left or right of the operating lever, malfunctions are reduced.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a preferred embodiment of this invention, Fig. 2 is an explanatory view of the locked state at two rotation centers, and Fig. 3 is an exploded perspective view showing a modification of the operating lever and the connecting link. , FIG. 4 is a side view for explaining the operation of the backrest. DESCRIPTION OF SYMBOLS 1... Seat part, 2... Backrest part, 3... Base plate, 4... First arm, 5... Second arm, 6,
7... Lock groove, 8, 9, 10... Engagement groove, 11
... Hook, 11A ... End, 12 ... Engagement member, 12A ... Engagement end, 13, 14 ... Projection pin, 15 ... Tension spring, 16 ... First link, 17 ... Length Hole, 18...Second link, 19...
...Elongated hole, 20...Connection link, 21...Operation lever.

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 surface of the seat back is rotatably attached to the upper end of the first arm, and the lower end of the second arm is provided with a locking groove. Engagement grooves are formed in the upper ends of the hooks, and the middle part of the hook whose end engages with the lock groove is rotatably attached to the first arm, and a protruding pin is provided between the rotation center of the hook and the end. A long hole formed at the upper end of the first link is fitted into the protruding pin, one end of the connecting link is rotatably attached to the lower end of the first link, and the middle part of the connecting link is rotated around the first arm. The upper end of the second link is rotatably attached to the other end of the connecting link, and the intermediate portion of the engaging member whose engaging end engages with the engaging groove is rotatably attached to the first arm. Attachment: A protruding pin is formed at the end of the engaging member, and an elongated hole formed at the lower end of the second link is fitted into the protruding pin, so that the hook and the engaging member are always rotated in the direction of engagement with each other. 1. A seat reclining device characterized in that a biasing means is provided to bias the link, and an operating lever for swinging the link is attached to the connecting link.