JP2001120381A - Seat reclining device with table mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat reclining device with a table mechanism which has no danger of hitting a seated person by a seat back like a hammer even if a reclining lock is canceled carelessly unless a table lock is canceled. SOLUTION: A ratchet wheel 20 is fixed on a center shaft 2 of a base bracket 1 and a lock pawl 22 to be engaged with a ratchet tooth section 21 is pivoted by a plate 24 fixed to a middle plate 3. The lock pawl 22 is engaged with a cam plate 27 with a long hole 28 through a pin 26. The cam plate 27 is rotatably supported on the center shaft 2 while being energized by a spiral spring 30 so as to be rotated clockwise. One end of a wire 33 is connected to the cam plate 27 and the other end of the wire 33 is connected together with an arm plate 5 to a rotating pulley 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a seat reclining device with a table mechanism.

[0002]

2. Description of the Related Art In general, a seat reclining device is a seating device in which a seat back can be tilted in the front-rear direction with respect to a seat cushion so as to secure an optimum driving posture or a comfortable sitting posture of a vehicle occupant. In order to use the seat back in this seat reclining device as a table, the seat back is tilted forward so that it can be folded substantially parallel to the seat cushion.

[0003]

However, in the conventional seat reclining device with a table mechanism, there is no lock mechanism for the seat back set in the table state. There was an inconvenience of spilling the juice above.

Therefore, if a locking mechanism is provided for the seat back set in the table state, if the operation lever for reclining lock is inadvertently released, the seat back with the table locked can be quickly moved to the vehicle body. There is an inconvenience that the vehicle moves forward, becomes a hammer state, and hits an occupant or the like.

Therefore, the present invention provides a seat reclining device with a table mechanism which does not cause a danger of hitting an occupant in a hammered state even if the reclining lock is inadvertently released unless the table lock is released. Made for the purpose of doing.

[0006]

In order to achieve the above object, according to the present invention, an intermediate plate is rotatably supported by a base plate fixed to a seat cushion side via a center shaft. Energize to rotate forward,
An arm plate fixed to the seat back side is rotatably supported on the intermediate plate via a shaft portion. One end of the intermediate plate has a toothed portion on a circumferential edge of a predetermined radius centered on the center shaft. And a reclining lock mechanism rotatably supported by a base plate on a lock plate having a tooth portion that engages with and disengages from the tooth portion, and a shaft portion at the other end of the intermediate plate. Seat reclining with a table mechanism having a toothed portion formed on the circumference of a circle having a predetermined radius around the center and a table lock mechanism rotatably supported by a table operating lever on a lock plate having a toothed portion which can be disengaged. In the apparatus, a ratchet wheel is fixed to the center shaft, and a lock pawl engaged with and disengaged from a ratchet tooth portion of the ratchet wheel is attached to the intermediate plate. Rotatably journaled, the cam plate, which opened the long hole pins projecting from the said lock pawl is engaged and rotatably supported urges rotatably to said center shaft,
One end of a wire was connected to the cam plate, and the other end of the wire was connected to a pulley fixed to one end of the arm plate to constitute a seat reclining device with a table mechanism.

Therefore, when the table is locked, the lock pawl and the ratchet teeth mesh with each other to fix the intermediate plate so that it cannot tilt forward or backward. Even if the reclining lock is easily released, the intermediate plate does not move, and there is no danger that the table-shaped seat back will fall forward and hit the operator.

According to a second aspect of the present invention, there is provided a leaf spring for urging the vicinity of the tip pawl of the lock pawl engaged with and disengaged from the ratchet teeth toward the ratchet wheel. The seat reclining device with the table mechanism described in 1 was constructed.

Therefore, since the lock pawl engaged with the ratchet teeth by the cam plate is urged by the leaf spring, there is no danger that both will come off easily, and a stable state can be maintained.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 4, an intermediate plate 3 is rotatably supported via a center shaft 2 on a base plate 1 fixed to a vehicle floor (floor surface of the vehicle). An arm plate 5 is rotatably supported via a shaft 4. The base plate 1 fixes the seat cushion, and the arm plate 5 fixes the seat back. An arc portion having a predetermined radius centered on the center shaft 2 is formed at a lower end portion of the intermediate plate 3, and a tooth portion 3a is formed in the arc portion, and a lock plate having a tooth portion 6a meshed with the tooth portion 3a. 6
Is rotatably supported on the base plate 1 by a shaft 7. Roller 8 to which one end of this lock plate 6 is disengaged
An operation lever 11 provided with a lever portion 10 rotatably supported by a shaft portion 9 is rotatably supported on the base plate 1 by a shaft 12.

The base plate 1 for holding the shaft 9, the shaft 7, the shaft 12 and the center shaft 2 of the operating lever 11
A return spring 14 is disposed between the control lever 11 and a cover plate 13 provided in parallel with the control lever 11, and the operation lever 11 is urged to rotate counterclockwise about the shaft 12. Therefore, the lock plate 6 is urged to rotate clockwise about the shaft 7 so that the teeth 3a, 6a mesh with each other, whereby the inclination angle of the intermediate plate 3 is maintained and the reclining lock is performed. This is a seat reclining device that can make the seat back substantially flat with respect to the vehicle floor by increasing the setting range of the tooth portion 3a centered on the center shaft 2.

An inner end of a spiral spring 15 is locked to the center shaft 2, and an outer end thereof is connected to the intermediate plate 3.
The intermediate plate 3 is urged to rotate counterclockwise about the center shaft 2 by being locked by the pin 16 implanted in the center. Therefore, when the operation lever 11 is rotated clockwise about the shaft 12, the roller 8 moves in a direction away from the lock plate 6, and the lever portion 10 rotates clockwise about the shaft 12 to rotate the tooth portions 3 a, 3. 6a is released,
In this state, the intermediate plate 3 rotates counterclockwise around the center shaft 2 by the urging force of the spiral spring 15 and falls forward.

Next, a ratchet wheel 20 is fixed to the center shaft 2 so as not to rotate, and a lock pawl 22 engaging and disengaging from the ratchet teeth 21 is turned to a plate 24 fixed to the intermediate plate 3 via a shaft 23. The pawl portion 25 of the lock pawl 22 is movably supported on the shaft and can be engaged with and disengaged from the ratchet teeth 21. Tip pawl 2 of lock pawl 22
5 is provided with a pin 26 projecting vertically, and this pin 26 is engaged with an elongated hole 28 formed in the cam plate 27. The long hole 28 is opened with a large opening at the upper part and a narrow and narrow part at the lower part. The cam plate 27 is a substantially fan-shaped plate rotatably supported by the center shaft 2, and has a spring locking portion 29 formed on a side portion thereof.
A spiral spring 30 is elastically mounted between the shaft and the center shaft 2, and the cam plate 27 is urged to rotate clockwise around the center shaft 2. A plate spring 31 that is in contact with the vicinity of the tip claw portion of the lock pawl 22 and that is biased in the counterclockwise direction is fixed and supported on the plate 24.

A connecting pin 32 is implanted in a hook portion of the cam plate 27, and a wire 33 is connected to the connecting pin 32. The wire 33 extends upward along the intermediate plate 3, and is connected at its upper end to a peripheral portion of a pulley 34 which is rotatable on the shaft portion 4 and appropriately fixed to the arm plate 5 via a collar at a ball end. ing. Therefore, when the wire 33 is pulled upward, the cam plate 27
Is rotated counterclockwise about the center shaft 2, and the rotation pushes the pin 26 toward the center shaft 2 through the elongated hole 28, and the tip claw 25 of the lock pawl 22 is engaged with the ratchet tooth 21. Combine.

A table setting lever 35 is rotatably supported on the arm plate 5 by a shaft 36. A cam recess 39 is formed on the arm plate 5 so as to engage with a cam 38 of a cam member 37 fixed to the shaft 36. One end of the plate 40 is a shaft 41
Is rotatably supported. The cam member 37 is urged to rotate clockwise by a coil spring 42. At the other end of the lock plate 40, a tooth 43 is formed.
3 is formed at the upper end of the arm plate 5, and a tooth 45 is formed at a position displaced from the tooth 44 by approximately 90 degrees. The teeth 44, 45 are formed on the circumference of a predetermined radius around the shaft 4, and the table setting lever 35 is rotated to operate the teeth 43 of the lock plate 40 and the teeth 44 of the arm plate 5. Is released, the seat back can be tilted forward, and when the table setting lever 35 is released, the teeth 43, 45 are engaged and the state is maintained, and the table is locked.

The operation of the seat reclining device with a table mechanism having the above-described structure will be described. In the reclining adjustment, the intermediate plate 3 is swirled by rotating the operating lever 11 to release the meshing of the teeth 3a, 6a as described above. To tilt forward about the center shaft 2 by the biasing force of the spring 15, tilt forward or backward at a desired angle, and then release the operating lever. Is locked. In this reclining adjustment, the cam member 40 maintains the state shown in FIG.
3, the positional relationship between the cam plate 27 and the lock pawl 22 does not change.
And rotate together.

When setting the table, as shown in FIG. 5, after the reclining lock is released and the initial position (shown in phantom line) is set, the table setting lever 3 is set.
When the table setting lever 35 is released, the arm plate 5 is tilted forward by about 90 degrees with respect to the intermediate plate, and the tooth portions 43, 44 are released. 45 are engaged and the state is locked. Therefore, the table settings are stable. The solid line in FIG. 5 shows the state of the table when the reclining lock is performed at the neutral position.

When the reclining lock is released, as shown in the phantom line in FIG.
Is tilted forward by the force of the spiral spring 15, the arc portion 3b faces the tooth portion 6a of the lock plate 6, and the reclining lock is not acting. Therefore, the intermediate plate 3 is slightly inclined backward from the initial position to the inclined state in which the teeth 3a and 6a are engaged for the first time, and the table is set in a state where the reclining lock is operated.

When the arm plate 5 tilts forward, the pulley 34 which rotates integrally with the arm plate 5 rotates,
The wire 33 is pulled upward, the cam plate 27 rotates counterclockwise, and the lock pawl 22 rotates counterclockwise via the pin 26 engaging with the elongated hole 28, and the tip claw portion 2
5 engages with the ratchet teeth 21. At this time, the leaf spring 3
Since the lock pawl 22 is urged by the ratchet teeth 21 by 1, the lock pawl 22 does not easily come off and can be maintained in a stable state.

In this table setting state, the tip claw 25
Engages with the ratchet teeth 21, so that the operating lever 11 for reclining adjustment is rotated to operate the teeth 3a,
Even when the engagement of 6a is released, the intermediate plate 3 does not rotate around the center shaft 2 in the forward tilt direction due to the urging force of the spiral spring 15. Therefore, in this state, even if the operation lever 11 is carelessly operated, there is no fear that the intermediate plate 3 falls down in the forward tilt direction and the seat back in the hammer state hits the occupant or the like.

When the table setting state is released, the table setting lever 35 is rotated to disengage the teeth 43 and 45, and when the seat back is tilted backward, the pulley 34 rotates and the wire 33 is cammed. The force of the spiral spring 30 urging the plate 27 is pulled toward the cam plate 27 side, and the cam plate 27 rotates clockwise, and the lock pawl 22 rotates clockwise via the pin 26 engaging with the elongated hole 28. Then, the tip claw 25 is separated from the ratchet teeth 21. Therefore, in this state, when the operation lever 11 is rotated to release the meshing of the teeth 3a, 6a, the intermediate plate 3 is tilted forward by the force of the spiral spring 15.

Thus, after the table is set, the intermediate plate 3 does not move even if the reclining lock is released, and the reclining lock can be released only after the table lock is released. There is no danger that the seat back in the state will hit the occupant or the like.

[0023]

According to the present invention described above, the arm plate is locked to the intermediate plate at the time of setting the table, so that the situation in which the arm plate is inadvertently raised does not occur. It is also possible to eliminate the risk that the canned juice or the like placed on the table falls and spills. Also, unless you cancel the table setting,
Even if the operation lever is carelessly operated, the intermediate plate does not tilt forward, and therefore, there is no danger that the hammered seat back may hit the operator.

[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 partial cross-sectional side view of FIG.

FIG. 3 is an enlarged view of a main part of FIG. 1;

FIG. 4 is an exploded perspective view of FIG.

FIG. 5 is an operation explanatory view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base plate 2 ... Center shaft 3 ... Intermediate plate 3a, 6a ... Tooth part 5 ... Arm plate 6 ... Tooth plate 8 ... Roller 11 ... Operating lever 13 ... Cover plate 14 ... Return spring 15 ... Spiral spring 20 ... Ratchet wheel 21 ... Ratchet tooth part 22 ... Lock pawl 24 ... Plate 25 ... Tip part 26 ... Pin 27 ... Cam plate 28 ... Long hole 30 ... Swirl spring 31 ... Leaf spring 32 ... Connecting pin 33 ... Wire 34 ... Pulley 35 ... Table setting lever 37 ... Cam member 40 ... Lock plate 43,44,45 ... Tooth

Claims (2)

[Claims] An intermediate plate is rotatably supported on a base plate fixed to the seat cushion side via a center shaft via a center shaft to urge forwardly, and an arm plate fixed to the intermediate plate on the seat back side is a shaft portion. The intermediate plate is rotatably supported, and a tooth portion is formed on one end side of the intermediate plate on a circumferential edge of a predetermined radius centered on the center shaft, and the tooth portion is engaged with and disengaged from the tooth portion. A reclining lock mechanism rotatably supporting a lock plate provided with a control lever on a base plate by an operation lever; and a tooth formed on a circumferential edge of a predetermined radius around the shaft at the other end of the intermediate plate. In a seat reclining device with a table mechanism having a table lock mechanism rotatably supporting a lock plate having a detachable tooth portion by a table operation lever. Fixing a ratchet wheel to the center shaft,
A lock plate that engages with and disengages from the ratchet teeth of the ratchet wheel is rotatably supported on the intermediate plate, and a cam plate having an elongated hole for engaging a pin protruding from the lock pawl is provided on the center shaft. It is rotatably urged and supported, and one end of a wire is connected to the cam plate,
A seat reclining device with a table mechanism, wherein the other end of the wire is connected to a pulley fixed to one end of the arm plate. 2. The seat reclining device with a table mechanism according to claim 1, further comprising a leaf spring for urging a portion near a tip claw portion of the lock pawl engaged with and disengaged from the ratchet teeth toward a ratchet wheel. apparatus.