JPH0480683B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a reclining mechanism, and particularly to a reclining mechanism in which a back bracket is hingedly connected to a seat bracket of an automobile seat via a hinge shaft, and the back bracket is connected to the seat bracket by a hinge shaft. The present invention relates to a reclining device for an automobile seat in which the inclination angle can be adjusted and fixed via an engaging mechanism provided on both sides of the seat.

(Prior Art) A conventional reclining mechanism is constructed by providing a sector gear on one bracket of the seat or backrest and a lock gear on the other bracket, and meshing the two gears. The inclination angle of the backrest was adjusted by adjusting the position. FIG. 5 shows this type of conventional engagement mechanism, in which a back bracket 2 is tiltable about a hinge shaft 1.
A sector gear 3 is fixed to the lower end of the sector gear 3, and teeth 4a of a lock gear 4 mesh with teeth 3a of the sector gear 3. A cam surface 4b is formed on the lower surface of the lock gear 4, and a cam surface 5a of the lock cam plate 5 is formed in relation to this cam surface 4b.
By the wedge engagement, the engagement between the sector gear 3 and the lock gear 4 is maintained, and the back bracket 2
is held at a predetermined tilt angle. As shown in FIG. 6, such an engaging mechanism is installed on both sides of the cushion seat, and the right lock cam plate 5R and the left lock cam plate 5L are connected by a torque transmission rod 6. (For example, in 1987-
(Refer to Publication No. 93254).

In this kind of double-sided lock type reclining device, when the lock is locked, the left and right lock cam plates 5L, 5
It is extremely important that the cam surface of R engages the cam surfaces of lock gears 4L and 4R at the same time.
By the way, if one lock cam plate and lock gear are engaged but the other lock cam plate and lock gear are not yet engaged, only one side of the engagement mechanism is working, which stabilizes both sides of the seat back. cannot be held. However, in reality, the dimensions between the rotation centers of the sector gear 3, the lock gear 4, and the lock cam plate 5 vary due to machining errors, and the cam surface 4a of the lock gear 4 and the lock cam plate 5 vary.
Due to machining errors with the cam surfaces 5a, it has been difficult to precisely match the timing of engagement of the cam surfaces of the lock cam plates of the interlocking lock mechanism provided on both sides of the cushion seat with the lock gear.

(Problems to be Solved by the Invention) Therefore, the present invention solves the problems of the prior art, and aims to cause the cam surfaces of the lock cam plates provided on both sides of the seat to almost simultaneously engage the cam surface on the lock gear side. It is an object of the present invention to provide a reclining device that can be adjusted to suit the needs of the user.

(Means for Solving the Problems) In order to achieve the above object, the present invention fixes a sector gear to either side of a pivot joint between a seat bracket and a back bracket, and attaches a lock gear to this sector gear. A lock mechanism is provided on both sides of the seat, and the lock gear meshed with the sector gear is fixed and held by a lock cam plate, and the lock mechanism is removably arranged, and the rotation of the handle operating shaft located on one side of the seat is controlled. In a reclining device in which torque is transmitted to the lock mechanism on the other side via a torque transmission rod, a release plate is fixed on the handle operating shaft, and a lock cam plate is rotated on a circular shaft portion of the handle operating shaft. A synchronization pin is protruded from the side surface of the lock cam plate at a position eccentric from the center of rotation, and the synchronization pin is loosely fitted into a circumferentially long adjustment hole formed in the release plate. moreover,
The lock cam plate is equipped with a spring means independent of the release plate for moving the lock gear in the direction of engaging and locking the sector gear.

(Embodiment) An embodiment of the reclining device according to the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the outer side of a left seat equipped with a reclining device according to the present invention, and in the figure, reference numeral 11 indicates a cushion seat and reference numeral 12 indicates a back seat. A seat bracket 13 is fixed to the cushion seat 11, while a seat bracket 13 is fixed to the cushion seat 11.
A back bracket 14 is fixed to 2, and both brackets 13 and 14 are tiltably connected by a hinge shaft 15, as is clear from FIG. At the lower end of the back bracket 14, the center of the pitch circle of the toothed portion 16a is aligned with the hinge shaft 15.
A sector gear 16 is fixedly aligned with the center of the sector gear 16. There is a support shaft 1 on the side of the seat bracket 13 above.
One end of a lock gear 18, which can swing around 7, is pivotally connected. A tooth portion 18a that can mesh with the tooth portion 16a of the sector gear 16 is formed on the top surface of the tip of the lock gear 18.
A cam surface 20 that can be wedge-engaged with a cam surface 19a of a lock cam plate 19, which will be described later, is formed on the side opposite to 8a. Further, a release pin 21 is provided protruding from the plate surface between the tooth portion 18a of the lock gear 18 and the cam surface 20.

On the other hand, as is clear from FIG. 3, a handle operating shaft 22 is rotatably mounted on the seat bracket 13, and a spline groove 23 is formed at the outer shaft end of the handle operating shaft 22. An operating handle 24 is attached to the groove 23. A circular shaft portion 25 having a circular cross section is formed on the handle operating shaft 22, and a mounting hole 19a of the lock cam plate 19 is rotatably fitted onto the circular shaft portion 25. A synchronizing pin 26 is protruded from the side surface of the lock cam plate 19 at a position offset by a radius R from the center of rotation.
The function of this synchronization pin 26 will be described later.

A spacer flange 27 and a square shaft part 28 are coaxially formed on the axis of the handle operating shaft 22, and a release plate 29 is formed on the square shaft part 28.
A square hole 30 is fitted. A shaft portion 31 adjacent to the square shaft portion 28 is pivotally supported by a bearing hole 33 of a cover plate 32, and an input end 34 having a square cross section is coaxially formed adjacent to the shaft portion 31. . Up to this point, the sector gear 16, lock gear 18, and lock cam plate 1 attached to the seat bracket 13 on the left side of the cushion seat 11 have been explained.
9. Although the configurations of the release plate 29 and the handle operating shaft 22 have been described, the seat bracket on the right side of the cushion seat 11 is also provided with completely similar components symmetrically. Above handle operation shaft 2
On the seat bracket on the right side, which is an extension of the axis of 2, there is arranged an operated shaft that is exactly the same as the previous handle operating shaft 22, except that it does not have a spline shaft. The inner end of the operated shaft and the input end 34 of the handle operating shaft 22 are connected by a torque transmission rod 35. This torque transmission rod 35 is made of a hollow tube, and both ends thereof are formed into square socket holes 35a.
is directly connected to the input end 34 of the handle operation shaft 22. As is clear from FIG. 2, the release plate 29 has a window 36 formed on its free end side, and the window 36 is loosely fitted into the release pin 21 protruding from the lock gear 18. The edge is adapted to engage with the release pin 21. Further, one end of a coil spring 37 is hooked to one end of the release plate 29, and the other end of the coil spring 37 is hooked to a spring hook (not shown) on the seat bracket 13. Furthermore, a circumferentially long adjustment hole 38 is bored on the release plate 29, and a synchronization pin 26 protruding from the lock cam plate is loosely fitted into the adjustment hole 38.

As is clear from FIG. 4, a spiral spring 40 is wound around the outer periphery of the spacer flange 27 of the handle operating shaft 22, and one end 40a of the spiral spring 40 is wound around the outer periphery of the spacer flange 27 of the handle operating shaft 22.
is fixed to the synchronizing pin 26, while the other end 40b is fixed to the side surface of the release plate 29. This spiral spring 40 is attached to the lock cam plate 1 during assembly.
9, the lock cam plate 19 is biased counterclockwise in FIG.
It acts to engage with.

Next, the operation of the reclining device according to the present invention described above will be explained.

To adjust the inclination angle of the back seat 12,
When the operating handle 24 is lifted upward, the handle operating shaft 22 rotates, the release plate 29 rotates clockwise in FIG. The lock cam plates 19 on both sides of the seat are synchronously engaged and rotated clockwise. Then,
The cam surface 19b of the lock cam plate 19 is the lock gear 1
8 are simultaneously released from the cam surfaces 20, and the spiral spring 40 is moved in the tightening direction, and the spring force is charged. Then, the opening edge of the window 36 of the release plate 29 acts on the release pin 21 to rotate the lock gear 18 about the support shaft 17 in a direction in which it is disengaged, allowing the sector gear 16 to rotate freely. Then, when the backseat 12 has been given a desired inclination angle, the operating handle 24 is released.
Then, the spring force of the coil spring 37 causes the release plate 29 to move toward the handle operating shaft 2 in FIG.
It is rotated counterclockwise around 2. At the same time, the left and right lock cam plates 19 are simultaneously rotated counterclockwise in FIG. 2 by the spring force of the spiral spring 40. Note that the rotation of the lock cam plate 19 is independent of the movement of the release plate 29, and since the release plate 29 is connected by a torque transmission rod 35, the release plates 29 on both sides move simultaneously, but the lock cam plate 19 The movements are independent on both sides. Lock cam plate 1 on both sides
9 can be rotated by the spring force of the spiral spring 40 without being affected by the rotation of the release plate 29.
The lock cam plates 19 on both sides rotate independently of each other, engage with the cam surface 20 of the lock gear 18, rotate the lock gear 18 in the meshing direction, and lock gear 1
The tooth portions 18a of No. 8 are completely meshed with the tooth portions 16a of the sector gear 16. Therefore, the pair of left and right lock cam plates 19 can be engaged with the cam surfaces 20 of the pair of left and right lock gears 18 almost simultaneously.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the lock cam plate is mounted on the handle operating shaft of the release plate so as to be rotatable relative to the release plate, and when the release plate is released, the lock cam plate is mounted so as to be rotatable relative to the release plate. Because the lock cam plate is equipped with a spring means that generates force,
When locking, the left and right lock cam plates forcefully engage the cam surface of the lock gear almost simultaneously due to the action of the spring force, and the teeth of the lock gear and sector gear engage to lock the left and right sides of the seat at the same time. It can be done reliably.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an automobile seat incorporating a reclining device according to the present invention, FIG. 2 is a front view showing the engagement mechanism of the reclining device, and FIG. 3 is a main part of the reclining device. 4 is an exploded perspective view of members constituting the interlocking lock mechanism, FIG. 5 is a partial side view of a conventional device, and FIG. 6 is a perspective view of the lock mechanism. 11... Cushion seat, 12... Back seat, 13... Seat bracket, 14... Back bracket, 15... Hinge shaft, 16... Sector gear, 18... Lock gear, 19... Lock cam plate, 22... Handle Operation shaft, 25...Circular shaft portion, 26...Synchronization pin, 28...Square shaft portion, 29...
...Release plate, 35...Torque transmission rod, 40...
Spiral spring.

Claims (1)

[Claims] 1. Fix the sector gear to either side of the pivot joint between the seat bracket and the back bracket,
A lock mechanism is provided on both sides of the seat, in which a lock gear is arranged to be removable from the sector gear, and the lock gear meshed with the sector gear is fixedly held by a lock cam plate. In a reclining device in which the rotation of a handle operating shaft is transmitted to the lock mechanism on the other side via a torque transmission rod, a release plate is fixed on the handle operating shaft, and a circular shaft of the handle operating shaft is A lock cam plate is rotatably fitted to the release plate, and a synchronization pin is protruded from the side surface of the lock cam plate at a position eccentric from the center of rotation. A reclining device characterized in that the lock cam plate is fitted with a loose fit in the long adjustment hole, and the lock cam plate is further equipped with a spring means that moves the lock gear in a direction to engage and lock the sector gear, independently of the release plate. .