JPH0838286A - Seat reclining device - Google Patents

Abstract

PURPOSE:To provide a lock unit which can assure the performance by itself. CONSTITUTION:This seat reclining device has a lock unit 10 comprising an upper tooth 15, a lower tooth 16, and a cam 17, each of which is pivotally supported with a shaft between two holder plates. The lock unit 10 has such a mechanism that the inner end part of a spiral spring 22 is connected to a center shaft 19 projected from the holder plate and the outer end part is connected to a pin 23 projectingly mounted on the upper tooth 15 in order to produce turning force in the direction of forward inclination, and between the cam 17 and the holder plate, a coil spring 31 is attached, which forcibly turns the cam 17 in the direction to bring the lower tooth 16 into contact with the upper tooth 15 with pressure.

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 for an automobile seat device, and more particularly, to a base plate having a lock mechanism unit in which main parts for adjusting reclining such as upper parts, lower teeth and cams are compactly integrated. Regarding fixed structures.

[0002]

2. Description of the Related Art A seat reclining device is a device for setting a desired inclination angle of a seat back in a seat device of an automobile to ensure a comfortable posture or an optimal driving posture of a seated person.

A conventional seat reclining device is shown in FIG.
As shown in FIG. 1, a seat back 4 is fixed to a base plate 2 fixed to a seat cushion 1 via a hinge shaft 3.
An arm 5 to be fixed to is rotatably rotatably supported, and an upper part 6 having teeth 6a formed on a circumference of a predetermined radius centered on the hinge shaft 3 is connected to the arm 5 and is connected to the teeth 6a. A lower tooth 7 having a tooth portion 7a that engages and disengages is pivotally supported by the base plate 2.

A cam 8 for rotating the lower tooth 7 and an operating lever 9 for rotating the cam 8 are rotatably supported by the base plate 2. In addition, in order to hold the hinge shaft 3, the lower tooth 7, the cam 8 and the shafts 7e and 9a of the operating lever 9 on both sides, the holder plate 2a
Are arranged parallel to the base plate 2. And
A spring 9b is mounted between the operating lever 9 and the base plate 2 so that the cam 8 attaches the lower tooth 7 to the upper part 6
It is always urged to press against.

A pin 6b projecting toward the base plate 2 is provided on the upper part 6 or the arm 5, and an arcuate elongated hole 2b into which the pin 6b is inserted is formed in the base plate 2 within a predetermined angle range about the hinge shaft 3. Established,
Alternatively, a standing bent portion that abuts the pin 6b within a predetermined angle range is provided in a protruding manner.

Therefore, when the operating lever 9 is lifted up and rotated, the cam 8 rotates and the contact portion 8a moves away from the permanent contact portion 7b of the lower tooth 7 into the cam groove 7c. While lowering the contact portion 7d, the lower tooth 7 separates from the upper part 6 and the meshing therebetween is released, and the upper part 6 is rotatable about the hinge shaft 3.

Therefore, when the seated person sets the seat back 4 at a desired angle and releases the operating lever 9, the operating lever 9 returns to its original state by the force of the spring 9b, and the cam 8 rotates in the opposite direction. Then, the contact portion 8a moves from the cam groove 7c to the permanent contact portion 7
By moving the lower tooth 7 to the upper tooth 6 and pressing the lower tooth 7 against the upper tooth 6, the tooth portions 6a and 7a of the both are engaged with each other, whereby the seat back 4 is locked at a desired inclination angle.

[0008]

However, according to the above-described conventional seat reclining device, since the inclination angles of the foremost inclination and the last inclination of the arm 5 are often different depending on the vehicle type, the base plate 2 has a flange portion. Since the arcuate elongated hole 2b and the vertical bending portion within a predetermined angle range centered on the notch or the hinge shaft 3 must be formed by changing the operating angle such as the vehicle type, the seat reclining device is commonly used for each operating angle. It becomes extremely difficult to make it. The sharing of seat reclining devices is a new demand based on the trend of integration and sharing of vehicle parts in the recent automobile manufacturing industry.

Therefore, the applicant has continued to propose the unitization of the lock mechanism (upper suspension, lower tooth and cam) of the seat reclining device in order to share the seat reclining device for each operating angle. However, in the case of unitizing the lock mechanism, in the proposals so far, the arm to which the seat back is fixed is not attached to the upper part, and therefore, there is also a spiral spring that biases the arm to rotate forward. do not do. Further, the operation lever for rotating the cam is not included as a unit. Therefore, it becomes difficult to guarantee performance, for example, to adjust the lever position for locking the cam and the lower tooth and to measure the arm return torque.

Therefore, there is no other method for guaranteeing the performance of the lock mechanism unit other than that for each product to which the lock mechanism is attached.

Therefore, an object of the present invention is to provide a seat reclining device provided with a lock mechanism unit capable of guaranteeing performance.

[0012]

To achieve the above object, a seat reclining device according to the present invention is a lower tooth having an upper part having an arc-shaped tooth part and a tooth part meshing with the tooth part of the upper part. And a lock mechanism unit that rotatably pivots between the two holder plates a cam that engages and disengages with the lower tooth and engages and disengages the tooth portion. The lock mechanism unit locks the inner end of the spiral spring on the center shaft, which protrudes from the holder plate and allows the upper part to loosely fit, and locks the outer end of the spiral spring on the upper part in the forward tilt direction. Rotate and urge the cam between the cam and the holder plate in the direction that the lower tooth presses against the upper part. It was constructed, characterized in comprising mounting the bullet machine for biasing.

[0013]

Operation: The upper part spring is urged by the spiral spring in the forward tilting direction, and the cam is rotatively pressed by the ammunition machine so that the lower tooth comes into pressure contact with the upper part, and the cam is held by two holder plates. Since it is configured so as to be pivotally supported between them, the performance of the lock mechanism unit itself can be guaranteed without an arm to which the seat back is connected, a base plate for fixing the seat cushion, and an operation lever for rotating the cam.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. 1 and 2 show a seat reclining device,
This seat reclining device is configured using a lock mechanism unit 10 shown in FIGS. 4 and 5. The lock mechanism unit 10 has its holder plate 11 fixed to a base plate 13 via a connecting pin 12.
The connection structure between the holder plate 11 and the base plate 13 is shown in FIG.

Therefore, the base plate 13 may have a shape different from the conventional one as long as the through hole for inserting the connecting pin 12 can be formed in the base plate 13. In this example, the base plate 13 has a shape in which the head portion is largely cut out, and the holder plate 11 supplements the cutout portion.

Therefore, the lock mechanism unit 10 will be described with reference to FIGS. 4 and 5. The upper part stopper 15, the lower tooth 16 and the cam 1 are arranged between the two holder plates 11.
7 is rotatably supported by shafts 19, 20, and 21, and a spiral spring 22 is attached to the shaft 19, and a pin 23 for locking the outer end of the spiral spring 22 is attached to the upper part stopper 15. Projected, the upper part 15 and the shaft 19
Is urged to rotate counterclockwise around the
The coil spring 31 is elastically mounted between the holder 7 and the holder plate 11 to form the lock mechanism unit 10.

The shafts 19 and 20 are both holder plates 1
1 is caulked to the shaft 1 (see FIGS. 2 and 3A), and the shaft 21
Has a holder plate 11 which is embossed and axially supported (see FIG. 3B). As shown in FIG. 2, the shaft 19 is a center shaft of the lock mechanism unit 10 in which a split groove 19a that protrudes to one side of the holder plate 11 and locks the inner end of the spiral spring 22 is formed.

A pin insertion hole 24 for connecting the base plate 13 to the lower side of the holder plate 11 is formed in a portion 25 where the two holder plates 11 are bent inward and brought into contact with each other.
It is a substantially polygonal shape that forms the head of No. 3. Therefore, the base plate 13 has a shape that is substantially the same as the shape of the conventional base plate only after being combined with the holder plate 11.

The holder plate 11 has shafts 19 and 2
0 and 21 are formed as stepped pins and are connected by caulking (see FIG. 2), and as shown in FIGS. 1 and 3D, the stepped pins are provided on the lower side of the center shaft (shaft 19). Connection reinforcement is provided at 32. This pin 32 also serves as a rotation stopper for the upper part 15.

The upper part 15 has teeth 15a formed on a circumference having a predetermined radius around the shaft 19 and three through holes 29 for connecting the arms 28 (FIG. 1). ing. An arm 28 having a through hole that matches the through hole 29 is overlaid, and a pin 30 (FIG. 1) is inserted therethrough.
By caulking the pin 30, both can be connected. Therefore, the upper part 15 has a shape having a protrusion for forming the through hole 29 for supporting three points. As described above, the pins 23 are provided on the upper parts 15 so as to lock the outer ends of the spiral springs 22.

The lower tooth 16 has a cam portion 16b formed on the other end side opposite to the shaft support end portion.
A tooth portion 16a is formed on the upper side of b. Cam part 16
A lever portion 16c is formed continuously from b to the shaft support end side. The lever portion 16c can contact the lever portion 17a of the cam 17.

The cam 17 is the cam portion 1 of the lower tooth 16.
6b has a contact portion 17b with which it abuts and is rotatably supported by the holder plate 11 integrally with the shaft 21.
The end provided on the b side is the locking portion 1 at one end of the coil spring 23.
Formed as 7c. A coil spring 31 is mounted as an ammunition between the engaging portion 17c of the cam 17 and the cut-and-raised portion 11a formed on the holder plate 11, and urges the cam 17 to rotate counterclockwise about the shaft 21. ing. The coil spring 31 has two holder plates 11 partially curved outward and accommodated therein.

An operating lever 33 is integrally mounted on the shaft 21 of the cam 17 so as to be rotatable. For example, one side portion of the shaft 21 is formed in an odd-shaped cross section such as an oval shape, and an oval hole is formed in the operation lever 33. As shown in FIG.
One side of the control lever 33 is pressed and crushed to be connected. Therefore, the operation lever 33, the shaft 21, and the cam 17 rotate integrally.

In FIG. 1, a base plate having a shape indicated by an imaginary line Z is adopted, and a flange portion of the base plate is attached to the upper part 1 as shown in FIG. 3 (A).
By forming the cover portion 34 by widening it to the 5 side, the tooth portion 15a can be hidden when the arm 28 is tilted to the end, and the inconvenience of foreign matter being caught in the tooth portion 15a can be eliminated.

Next, the operation of the above embodiment will be described. In FIG. 1, when the operation lever 33 is rotated clockwise about the shaft 21, the cam 1 integrated with the operation lever 33 is operated.
7 rotates clockwise while pulling the coil spring 31 about the shaft 21, and the contact portion 17b separates from the cam portion 16b.

The cam contact portion 17d is replaced by the lever portion 16
Press the lower tooth contact portion 16d of c to lower the lower tooth 1
6 rotates about the shaft 20 in the clockwise direction in the drawing. Therefore, the engagement between the tooth portion 16a and the tooth portion 15a starts to be released.

When the contact portion 17b of the cam 17 is separated from the cam portion 16b, the teeth 16a and 15a are completely disengaged, and the cam portion 16b moves to the side surface of the contact portion 17b. Therefore, the upper part 15 becomes rotatable about the shaft 19. Lower tooth 16 is cam 1
The lever section 1 will not be completely free from 7
6c comes into contact with the lever portion 17a and is restricted from swinging.

Therefore, the arm 28 is tilted forward by the force of the spiral spring 22 which is urged to rotate, and conversely, when the arm 28 is rotated clockwise through the seat back, it is tilted last. Further, when the seat back is tilted at a desired angle and the operation lever 33 is released, the operation lever 33 moves the coil spring 3
The force of 1 restores the original state, and the cam 17 rotates in the opposite direction. Then, the contact portion 17b of the cam 17 rotates counterclockwise about the shaft 21 and comes into contact with the cam portion 16b, so that the lower spring 16 is urged by the force of the coil spring 31 and the lower tooth 16 rotates about the shaft 20. It rotates counterclockwise in the drawing, and the tooth portion 16a meshes with the tooth portion 15a of the upper part 15. Therefore, the seat back inclination angle set by the seated person is maintained.

[0029]

According to the present invention described above, the upper part spring is biased by the spiral spring in the forward tilting direction, and the cam is pivotally biased by the bullet so that the lower tooth is pressed against the upper part spring. Further, since the cam is configured to be pivotally supported between the two holder plates, even if there is no arm for connecting the seat back, a base plate for fixing the seat cushion and an operation lever for rotating the cam, It is completed as a seat reclining device by itself, and the performance can be guaranteed regardless of changes in the arm or base plate.

[Brief description of drawings]

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

FIG. 2 is a sectional side view of FIG.

3A to 3D are cross-sectional views of each part of FIG.

FIG. 4 is a front view of a lock mechanism unit.

5 is a sectional side view of FIG.

FIG. 6 is a front view of a conventional example.

[Explanation of symbols]

 10 ... Lock mechanism unit 12 ... Connecting pin 13 ... Base plate 14 ... Holder plate 15 ... Upper parts 16 ... Lower tooth 17 ... Cam 19 ... Shaft (center shaft) 20, 21 ... Shaft 22 ... Spiral spring 28 ... Arm 31 ... Coil spring ( Ammunition) 33 ... operating lever

Claims (3)

[Claims] 1. An upper part tooth having an arcuate tooth part, a lower tooth having a tooth part meshing with the tooth part of the upper part tooth, and a cam for engaging and disengaging the tooth part by engaging and disengaging with the lower tooth. In a seat reclining device having a lock mechanism unit that rotatably and two pivotally support between two holder plates, the lock mechanism unit protrudes from the holder plate and is attached to a center shaft on which the upper part loosely fits. The inner end of the spiral spring is locked, and the outer end of the spiral spring is locked to the upper part to urge it to rotate forward, and the lower tooth is pressed against the upper plate between the cam and the holder plate. A seat reclining device having an ammunition for urging a cam to rotate in a direction of rotation. 2. A cam shaft having an irregular cross section formed by projecting one end side of the shaft from a holder plate, and an irregular cross section hole for fitting the irregular cross section shaft is formed in the operating lever. The seat reclining device according to claim 1, wherein the operation lever is connected to the shaft of the cam at the section. 3. The cover portion of the tooth portion is formed by forming a flange portion of the base plate near the upper part lower and the lower tooth to a width greater than the wall thickness of the upper part lower and the tooth. Seat reclining device.