JP2001008766A - Seat reclining device with table mechanism - Google Patents

Abstract

(57) [Summary] To operate a seat back of a seat reclining device in a table state so as to prevent an unexpected accident such as a collision of a head of a seat back tilted forward with an operator. A pivot plate is pivotally supported on a center hinge of a base plate, and the pivot plate is connected to an operation lever by a link. Rotating plate 3
The slide plate 30 having a lock pin 35 at the lower end which can slide on the circular arc portion 36 of the seventh plate 7 is urged upward by a return spring 34 to be supported on the lower arm 3. A lock pin 29 is provided at the upper end of the slide plate 30, and the pin 29 is brought into contact with the arc 27 of the upper arm 5. An indented lock recess 28 is formed in the arc portion 27, and a lock pin 29 is engaged with and disengaged from the lock recess 28.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat reclining device with a table mechanism, and unless the seat back is first tilted forward with an operating lever.
An object of the present invention is to prevent the operator from being injured unexpectedly at the head of the rotating seat back by preventing the seat back from being brought into the table state by the table lever.

[0002]

2. Description of the Related Art Among seat reclining devices for vehicles, there is known a seat reclining device in which an arm supporting a seat back is folded in two steps so that the seat back can be folded substantially horizontally above an upper portion of a seat cushion. 57-99
3, JP-B 5-22527 and JP-A-8-2198.
No. 1).

[0003]

However, according to the above-mentioned known example, when the seat back is set in the table state, one of the arms (lower arm) which is bent in two steps is moved to the most forwardly inclined position in advance, and then the arm of the arm is bent. The other (upper arm)
When the operating lever of the seat reclining device is released after the upper arm is first tilted forward, the head of the seatback that has already been tilted forward by the force of the spring releases the operating lever. An unexpected accident such as hitting an operator may occur.

Accordingly, the present invention has been made to prevent an unexpected accident such as a collision of a head of a seat back tilted forward when operating a table with an operator. .

[0005]

According to the present invention, in order to solve the above problems, a lower end of a lower arm is pivotally supported on a base plate fixed to a seat cushion so as to be rotatable. An upper arm is rotatably supported at the upper end of the lower arm, a seat back is fixed to the upper arm, and a table lever capable of locking the upper arm at a table position and an upright position with respect to the lower arm is provided. A seat reclining device comprising a lock portion provided with an operating lever capable of adjusting the lower arm with respect to the base plate while reclining the lower arm, wherein the base plate has an arc portion having a predetermined radius and is continuous with the arc portion. A pivot plate having an engagement step portion is pivotally supported, and the pivot plate is connected to the operation lever, while A slide plate having an engagement portion capable of abutting on the arc portion of the rate and engaging with the engagement step portion is supported on the lower arm so as to be movable in the longitudinal direction, and the rotation of the upper arm The upper arm is provided with a cam portion which slides on the upper end of the slide plate to move the slide plate toward the base plate.

Therefore, when the seat back is in the reclining range in which the seat can be seated, if the table lever is operated to rotate the seat back to the table position, the upper arm rotates forward and slides by the cam portion. The plate attempts to move to the base plate side, but since the engaging portion of the slide plate abuts against the arc portion of the rotating plate, the slide plate cannot move downward, so that the upper arm is tilted forward,
That is, the seat back cannot be set in the table state.

In order to set the seat back at the most inclined position to the table state, when the upper arm is rotated, the slide plate moves to the base plate side, and the engaging portion is engaged with the engaging step of the rotating plate. The upper arm can be pivoted to the table position to engage the part, and the seat back can be in the table state. Also, in this table state, even if the user mistakenly operates the operation lever to raise the seat back, the engaging step of the rotating plate engages with the engaging portion of the slide plate and cannot rotate. The operation lever interlocking with the rotation lever cannot be rotated, and the lock of the reclining side lock portion cannot be released.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention.
~ As shown in Fig. 4, a base plate 1 fixed to a vehicle body
A lower end of a lower arm 3 is pivotally supported on a center hinge 2 protruding from the lower arm 3, and an upper arm 5 is supported on an upper end of the lower arm 3 so as to be rotatable about a hinge shaft 4. ing. An arc portion having a predetermined radius around the center hinge 2 is formed at a lower end portion of the lower arm 3, and a tooth portion 6 is formed at a peripheral edge of the arc portion.
A tooth plate 8 having a tooth portion 7 meshing with the tooth portion 6 is rotatably supported on the base plate 1 so as to be rotatable about a hinge shaft 9. An operation lever 12 having a roller 10 a removably slidingly contacting a lower portion of the free end 8 a of the tooth plate 8 is rotatably supported about a hinge shaft 11. The sub plate 10 is rotatably supported on the hinge shaft 11 together with the operation lever 12, and the operation lever 12 is urged to rotate counterclockwise by a return spring 13. The sub-plate 10 supports the roller 10a with both ends so that the free end 8a of the tooth plate 8 is sandwiched between the toothed plate 8 and the operation lever 12. The sub-plate 10 rotates integrally with the operation lever 12 to rotate the roller 10a. 8 at the free end.

Although not shown, a substantially triangular holder plate for covering the lock portion of the engagement between the lower arm 3 and the tooth plate 8 is fixed to the center hinge 2 and the hinge shafts 9 and 11, respectively. They are provided facing each other. One end of the return spring 13 is locked to the holder plate.

An inner end of a mainspring 14 is engaged with the center hinge 2, and an outer end of the mainspring 14 is engaged with a pin 15 planted on the lower arm 3. It is urged to rotate counterclockwise about the center hinge 2. At the upper end of the lower arm 3, an arc portion having a predetermined radius around the hinge shaft 4 is formed,
Two lock teeth 16 and 17 are formed at intervals around the periphery of the arc. The lock teeth 16,
A tooth plate 19 formed with a locking tooth portion 18 that engages with and disengages from 17 is pivotally supported by the upper arm 5 so as to be rotatable about a hinge shaft 20. A cam recess 21 is formed in the tooth plate 19, and a cam 23 having a cam projection 22 engaging with the cam recess 21 is supported by the upper arm 5 so as to be rotatable integrally with a hinge shaft 24. The cam 23 is constantly urged to rotate clockwise by the return spring 25. A table lever 26 is integrally connected to the hinge shaft 24, and the hinge shaft 24 and the cam 23 rotate integrally by a rotation operation of the table lever 26. Although not shown, substantially triangular holder plates covering the engagement lock portion between the lower arm 3 and the tooth plate 19 are fixed to the hinge shafts 4, 20, and 24, respectively, and provided opposite to the upper arm 5. Have been. One end of the return spring 25 is locked to the holder plate. 5a is a bracket for attaching an armrest (not shown).

At the lower end of the upper arm 5, a cam portion 27 having a different distance from the hinge shaft 4 is formed on the peripheral edge thereof, and a lock recess 28 is formed at one end of the cam portion 27. Is formed. A slide plate 30 in which a lock pin 29 slidingly contacting the cam portion 27 and the lock concave portion 28 is pivotally mounted on an upper end portion is inserted into two spaced long holes 31 formed in parallel in the longitudinal direction.
At 33, it is supported by the lower arm 3 so as to be able to reciprocate up and down. A return spring 34 is wound around one of the pins 32, one end of which is locked by the lower arm 3, and the other end of which is locked by the slide plate 30, and the slide plate 30 is constantly moved and biased toward the upper arm 5. ing.

At the lower end of the slide plate 30, a lock pin 35 as an engaging portion is pivotally mounted.
A substantially fan-shaped rotating plate 37 having an arc portion 36 with which the member 5 can abut is rotatably supported about the center hinge 2. One end of a link 39 is pivotally connected to the lower end of the rotating plate 37 facing the arc 36 via a pivot 38, and the other end of the link 39 is connected to the sub-plate 10 via a pivot 40. ing.

The arc portion 36 of the rotating plate 37 is formed to have a width that always faces the lock pin 35 of the slide plate 30 in the reclining adjustment range of the lower arm 3, and when the lower arm 3 is moved to the most inclined position. An engagement step portion 36 a to which the lock pin 35 can face and engage is formed adjacent to the arc portion 36.

Next, the operation of the above configuration will be described. When the table is to be set in the seated state shown in FIG. 1, the table lever 26 is first turned counterclockwise about the hinge shaft 24 to rotate the cam 23. The cam projection 22 pushes the cam recess 21 of the tooth plate 19 to rotate clockwise around the hinge shaft 24, so that the lock teeth 18 are disengaged from the lock teeth 16 and the upper arm 5 can rotate. Since the slide plate 30 cannot move by contacting the arc portion 36 of the rotation plate 37, the cam portion 27 cannot rotate by pushing down the lock pin 29, and therefore the seat back cannot be tilted forward. . That is, when the upper arm 5 is rotated counterclockwise about the hinge shaft 4, the cam portion 27 of the upper arm 5 tries to push down the lock pin 29 at the upper end of the slide plate 30. Since the lock pin 35 at the lower end is in contact with the arc portion 36 of the rotating plate 37, the slide plate 30 cannot be lowered, and therefore, the lock pin 29 maintains the state of being engaged with the lock recess 28. It cannot be in a state.

Therefore, in order to set the table state, first, in the state shown in FIG. 1, the operation lever 12 is gripped and pulled upward, and when the operation lever 12 rotates clockwise about the hinge shaft 11, Since the roller 10a rotates clockwise about the hinge shaft 11 and separates from the free end of the tooth plate 8, the tooth plate 8 rotates counterclockwise about the hinge shaft 9 by its own weight. 5, the lower arm 3 is rotated counterclockwise around the center hinge 2 by the force of the mainspring 14 and moves to the frontmost inclined position, as indicated by the imaginary line in FIG. At this time, the lower arm 3 and the base plate 1
A long hole 41 is formed on one of the circles and located on the circumference of a predetermined radius around the center hinge 2.
On the other hand, since a stopper composed of a pin 42 engaging with the long hole 41 is provided, the rotation of the lower arm 3 is restricted within a certain range.

Next, by rotating the table lever 26 counterclockwise about the hinge shaft 24, the cam 22 and the hinge shaft 24 integrally rotate counterclockwise, and the cam projection 22 is rotated. Engages with the cam recess 21 to rotate the tooth plate 19 clockwise about the hinge shaft 20. Therefore, the tooth plate 19
Is disengaged from the lock teeth 16 of the lower arm 3 so that the upper arm 5 can rotate about the hinge shaft 4. Therefore, when the upper arm 5 is rotated counterclockwise about the hinge shaft 4 through the seat back (not shown) and tilted forward, the rotation of the upper arm 5 causes
The lock pin 29 at the upper end of the slide plate 30 comes off the lock recess 28 of the upper arm 5 and slides down on the cam 27 to be pushed down. At this time, the lock pin 35 at the lower end of the slide plate 30 engages with the engagement step portion 36a without abutting on the arc portion 36 of the rotating plate 37, so that the slide plate 30 is
Descends against the power of. Then, at the table position, the lock teeth 18 are engaged with the other lock teeth 17 by the table lever 26, the cam 23, and the tooth plate 19 which have been returned to the original state by the return spring 25, and are shown by phantom lines in FIG. As described above, the upper arm 5 and the lower arm 3 are locked at a predetermined angle where they intersect, and the seat back is in a table state. In order to regulate the allowable rotation range of the upper arm 5, a long hole 43 is formed in the upper arm 5 around the hinge shaft 4, and a pin 44 engaging with the long hole 43 is planted in the lower arm 3. Has been established.

In this state, if the operation lever 12 is lifted upward to perform reclining adjustment, the rotation plate 30 will rotate counterclockwise around the center hinge 2, but the lock pin 35 will be engaged. It cannot rotate because it is engaged with the joint 36a. Therefore, when the table is set, the reclining adjustment cannot be performed no matter how the operating lever 12 is operated.

When changing from the table state to the seating state, first, the table recess 26 is operated to rotate the cam recess 21 clockwise about the hinge shaft 24 by the cam projection 22 to rotate the tooth plate 19. Is rotated clockwise about the hinge shaft 20, the lock teeth 1
Since the upper arm 8 is disengaged from the lock teeth 17, the table arm 2 is returned to the original state by the return spring 25 after the upper arm 5 is rotated clockwise about the hinge shaft 4.
6, the lock teeth 18 are engaged with the lock teeth 16 by the cam 23 and the tooth plate 19, and are locked in the upright position parallel to the upper arm 5 and the lower arm 3. At this time, the lock pin 29 slidingly contacting the arc portion 27 of the upper arm 5
Engages with the lock recess 28, whereby the slide plate 30 is moved upward by the force of the return spring 34, and the lock pin 35 at the lower end thereof is engaged with the engagement step 3 of the rotary plate 37.
6a, and moves upward so as to be able to contact the arc portion 36.

In this state, by rotating the operation lever 12 to rotate the tooth plate 8 counterclockwise about the hinge shaft 9, the engagement of the teeth 7, 6 is released, and the lower arm 3 is rotated. Is rotatable about a center hinge 2. Therefore, the lower arm 3 via the seat back
Is rotated clockwise around the center hinge 2 to set a desired inclination angle, and when the operation lever 12 is released, the operation lever 12 is moved by the force of the return spring 13 to the hinge shaft 11.
, The roller 9 pushes up the free end of the tooth plate 8, and the tooth plate 8 rotates clockwise about the hinge shaft 9 so that the teeth 7, 6 mesh with each other. Keeps the angle. At this time, the lock pin 35 of the slide plate 30 is
The sliding contact of the circular arc portions 7 does not cause any obstacle, and the desired angle from the seated state to the full flat state can be set freely.

Therefore, if the lower arm 3 is not in the most forwardly inclined position, the upper arm 5 cannot be encircled to the table position even if the table lever 26 is operated. In a certain state, the lower arm 3 is always in the forward tilted position, and furthermore, in this state, the operation lever cannot be released, so that an accident such as the head of the seat back hitting the operator can be prevented.

Further, since the operation lever 12 cannot be released when the upper arm 5 is at the table position, the lock of the reclining side lock portion does not become unlocked in the table state, and therefore, the stand-up position from the table position. The operation lever 12 is not accidentally operated when returning to the position, and no load is applied to the rotating plate 37 or the slide plate 30 even if an attempt is made to cause the seat back, so that the structure can be made simple and low in strength. In addition, the weight and cost can be reduced.

Further, even when the lower arm 3 is in the most forwardly inclined position, when the operating lever 12 is pulled and the lock is released, the rotating plate 37 is rotated and the arc portion 36 is locked by the lock pin. Since it has been moved to a position where it can come into contact with 35, it cannot be brought into a table state.
For the operation to the table state, the lower arm 3 is in the forward inclined position,
In addition, since the operation cannot be performed unless it is in the locked state, the safety is extremely high.

Further, a lock recess 28 is provided in the cam portion 27.
When the lock pin 35 of the slide plate 30 is in contact with the arc portion 36 of the rotating plate 37, the lock pin 29 of the slide plate 30 does not come off from the lock recess 28. The movement range of the upper arm 5 when the table lever 26 is operated in an impossible state is reduced, and the deformation and damage due to the engagement of the cam 27 and the lock pin 29 when the upper arm 5 is forcibly rotated are prevented. be able to.

[0024]

According to the present invention described above, it is impossible to mechanically make the seat back immediately lean forward to the table state in the seated state. It is possible to prevent an unexpected accident such as a collision with the face of the user. Further, after the table is in the table state, the operation lever cannot be released, so that a situation in which the table is accidentally turned over does not occur.

[Brief description of the drawings]

FIG. 1 is a front view of a seat reclining device showing an embodiment of the present invention.

FIG. 2 is a front view of the seat reclining device shown in FIG. 1 in a table state.

FIG. 3 is a side view of a lower portion of the seat reclining device shown in FIG. 1;

FIG. 4 is a side view of an upper portion of the seat reclining device shown in FIG. 1;

FIG. 5 is an explanatory diagram of an operation of a lower portion in a table state.

FIG. 6 is an explanatory diagram of an operation of an upper portion when a table state is set.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base plate 2 ... Center hinge 3 ... Lower arm 4, 9, 11, 20, 24 ... Hinge shaft 5 ... Upper arm 6, 7 ... Tooth part 12 ... Operation lever 13 ... Return spring 14 ... Spring spring 16, 17, 18 … Lock teeth 19… tooth plate 21… cam recess 22… cam projection 23… cam 25… return spring 26… table lever 27… cam 28… lock recess 29, 35… lock pin 30… slide plate 31… long hole 32, 33 ... Pin 34, 34a ... Return spring 36 ... Arc part 36a ... Engagement step part 37 ... Rotating plate 39 ... Link

Claims (1)

[Claims] A lower end of a lower arm is rotatably supported on a base plate fixed to a seat cushion, an upper arm is rotatably supported on an upper end of the lower arm, and a seat back is mounted on the upper arm. A lock portion provided with a table lever capable of fixing the upper arm to the table position and the upright position with respect to the lower arm, respectively, and an operation lever capable of adjusting the lower arm to recline with respect to the base plate. In the seat reclining device provided with a lock portion, a pivot plate having an arc portion having a predetermined radius and an engaging step portion continuous with the arc portion is pivotally supported on the base plate, and the pivot plate and the operation lever And an engaging portion capable of contacting the arc portion of the rotating plate and engaging with the engaging step portion. The lower arm is movably supported in the longitudinal direction by the lower arm, and the upper arm is pivotally moved to slide the upper end of the slide plate to move the slide plate toward the base plate. A seat reclining device with a table mechanism, which is provided on an arm.