JPH048818Y2 - - 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 difference in level between the seating surface of the backrest and the seating surface of the seat, creating a continuous flat surface. This is because when 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 attached to the lower end of the seatback bracket. is rotatably attached to the seat cushion 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 ball support shaft is rotated using the operation 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, an object of this invention is to provide a seat reclining device that can tilt the backrest portion forward to bring its back surface into a substantially horizontal state, and that can achieve weight reduction and cost reduction with a simple structure.

[Means for solving problems]

In order to achieve the above object, this invention has the base end of the operating lever rotatably attached to a base plate fixed to the side surface of the seat portion of the seat, and the lower end of the first arm rotatably attached. The lower end of a second arm fixed to the side of the seat backrest is rotatably attached to the upper end, and the lower end of the second arm is rotatably attached to the lower end of the second arm.
The intermediate portion of the hook that engages with these lock grooves is rotatably attached to the first arm, and the end of the hook opposite to the end that engages with the lock groove is provided with a first link. The upper end is rotatably attached, and the other end of the short link, one end of which is rotatably attached to the base plate, is rotatably attached to the lower end of this first link, and an engagement groove is formed in the upper end of the base plate. The middle part of the engagement member that engages with the engagement groove is rotatably attached to the first arm, and the upper end of the second link is positioned from the center of rotation of the engagement member toward the end that engages with the engagement groove. is rotatably attached to the lower end of this second link, one end of which is rotatably attached to the base plate, and the other end of the short link is rotatably attached to the lower end of this second link, and when the backrest is raised, the lower end of the second link becomes the operating lever. The lower end of the first link contacts the upper surface of the operating lever when the backrest is tilted forward, and the engaging end of the engaging member is always connected to the engaging groove at the opposite end of the engaging member. A biasing member that biases the hook in the direction of engagement is attached, and a biasing member that biases the hook in the direction of engagement is provided.

[Effect]

In this invention, when a person is seated on the seat, that is, when the backrest is upright, the lower end of the second link is in contact with the upper surface of the operating lever, so by lifting the tip of the operating lever, the second link is raised. As the second link rises, the engagement end of the engagement member is disengaged from the engagement groove, allowing the first arm to rotate freely. As the first arm is rotated forward, the lower end of the first link will come into contact with the top surface of the operating lever, and when the operating lever is lifted in this state, the first link will be raised and attached to the first link. The hook rotates and comes out of the lock groove, thereby freeing the second arm to rotate. If the second arm is tilted forward in this state, the backrest portion will be tilted forward until it becomes approximately horizontal.

〔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 base end of the operating lever 4 is rotatably attached to the base plate 3, and the lower end of the first arm 5 is rotatably attached to the base plate 3. . The lower end of a second arm 6 fixed to the side surface of the seat back 2 is rotatably attached to the upper end of the first arm 5.
Two or more locking grooves 7, 8 are formed at the lower end of the locking groove. The intermediate portion of the hook 9 having an end portion 9A that engages with these lock grooves 7, 8 is rotatably attached to the first arm 5.
The upper end of the first link 10 is rotatably attached to the end opposite to the end 9A that engages with the link 8. This first
One end of the short link 11 is rotatably attached to the base plate 3, and the other end of the short link 11 is rotatably attached to the lower end of the link 10.

An engagement groove 12 is formed at the upper end of the base plate 3 as shown in FIG. It is installed on. Engagement end 1 of engagement member 13
3A engages with the engagement groove 12. The upper end of the second link 14 is rotatably attached to a point extending from the rotation center A of the engaging member 13 to the end 13A that engages with the engaging groove 12, and one end is attached to the lower end of the second link 14 as a base. The other end of a short link 15 rotatably attached to the plate 3 is rotatably attached. Further, an engagement end 1 is provided at an end opposite to the engagement end 13A of the engagement member 13.
A biasing member 16 is attached that always biases 3A in the direction of engagement with the engagement groove 12. This biasing member 16
consists of a tension spring, one end of which has a hook 9.
The other end is attached to the engaging member 13. As a result, the end portion 9A of the hook 9 is always biased in the direction of engagement with the lock grooves 7 and 8. The centers of rotation of the short links 11, 15 and the first arm 5 are located on the same axis and are set at locations indicated by the symbol B.

If the same mechanism is provided on both sides of the seat, the connecting shaft 17 may be attached to the center of rotation of the operating lever 4.

The state shown in FIG. 1 is the state shown by the solid line in FIG. 3, and it is possible to sit in this state. Backrest part 2
To tilt forward, pull up the operating lever 4 in the state shown in FIG. When the operating lever 4 is pulled upward, the lower end of the second link 14 that is in contact with the upper surface of the operating lever 4 is raised, and when the second link 14 is raised, the engaging member 13 is rotated counterclockwise in the drawing. . When the engagement member 13 rotates counterclockwise around the rotation center A, the engagement end 13A
comes out of the engagement groove 12. In this state, the backrest portion 2 can be tilted forward. Fig. 3 Middle backrest part 2 is tilted at an angle of approximately 45° (Fig. 3 2
In the state shown by the dotted chain line), the first
The lower end of the link 10 comes into contact with the upper surface of the operating lever 4, and in this state, the forward tilting movement of the backrest portion 2 is temporarily stopped. The lower end side of the first link 10 is the operating lever 4
When the operating lever 4 is pulled upward again while in contact with the upper surface, the first link 10 is raised, the hook 9 attached to the first link 10 rotates, and the end 9A is removed from the lock groove 8. It comes off. End 9
When A is removed from the lock groove 8, the second arm 6 can rotate about the rotation center C. If the second arm 6 is tilted forward in this state, it can be tilted forward to the state shown by the dotted line in FIG. 3, that is, to a substantially horizontal state. In this horizontal state, the end 9 of the hook 9
A engages with the lock groove 7.

When the backrest portion 2 is tilted backward, the first arm 5 and the second arm 6 are always integrated, that is, the end portion 9A
Since the backrest part 2 is tilted backward about the rotation center B in a state in which the backrest 2 is engaged with the lock groove 8, the backrest part 2 can be tilted backward to a fully flat state. In the illustrated embodiment, the engagement groove 12 is formed at only one location, but it goes without saying that it may be formed at multiple locations.
In addition, in the front line state shown by the dotted line in Figure 3,
The end 9A of the hook 9 is engaged with the lock groove 7 so that the backrest 2 does not rattle due to vibrations while the vehicle is running.

〔effect〕

As explained above, this invention is constructed so that the arm can be folded in two, as in the past, but
The structure is simplified, and only one operating lever is required for forward and backward tilting operations. That is, at two rotation points (B and C in the figure): releasing the locked state in the seated state (releasing the lock by the engaging member) and releasing it after tilting it halfway forward (releasing the lock by the hook). Unlocking is 1
This is done using two operating levers. Furthermore, when the backrest is tilted forward, the backrest temporarily stops at an intermediate point, which eliminates the risk of damaging luggage, etc. placed on the seat, and prevents the backrest from tilting forward. Once the seat has stopped, the user operates the operating lever again to place the backrest in a nearly horizontal position, which provides high safety. Furthermore, since the two rotation centers are not unlocked at the same time, malfunctions are eliminated.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a preferred embodiment of the invention, FIG. 2 is a perspective view showing the seat being folded forward, and FIG. 3 is a side view showing the operation of the entire seat. DESCRIPTION OF SYMBOLS 1...Seat part, 2...Backrest part, 3...Base plate, 4...Operation lever, 5...First arm, 6...
...Second arm, 7,8...Lock groove, 9...Hook, 9A...End, 10...First link, 11,
15...Short link, 14...Second link, 13...
...Engagement member, 13A...Engagement end, 12...Engagement groove, 16...Biasing member.

Claims (1)

[Claims for Utility Model Registration] The base end of the operating lever is rotatably attached to a base plate fixed to the side surface of the seat portion of the seat, and the lower end of the first arm is rotatably attached, and the lower end of the first arm is rotatably attached to the upper end of the first arm. The lower end of the second arm fixed to the side of the backrest of the seat is rotatably attached, two or more locking grooves are formed in the lower end of the second arm, and the middle part of the hook that engages with these locking grooves is attached to the second arm. The first link is rotatably attached to the first arm, 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 first link is rotatably attached to the lower end of the first link. The other end of the movably attached short link is rotatably attached, an engagement groove is formed in the upper end of the base plate, and the intermediate portion of the engagement member that engages with the engagement groove is rotated to the first arm. The upper end of the second link is rotatably mounted on the side of the end that engages with the engagement groove from the center of rotation of the engaging member, and one end is rotatably attached to the base plate at the lower end of this second link. The other end of the short link is rotatably attached, so that when the backrest is upright, the lower end of the second link comes into contact with the upper surface of the operating lever, and when the backrest is tilted forward, the lower end of the first link comes into contact with the upper surface of the operating lever. A biasing member is attached to an end opposite to the engaging end of the engaging member to urge the engaging end in a direction in which the engaging end always engages with the engaging groove, and also in a direction in which the hook is engaged. A seat reclining device comprising a biasing member that biases the seat.