JPH0984650A - Seat reclining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To engage 1st and 2nd engaging parts near the center of a pole in breadthwise direction without providing any member protruded in the plate thickness-wise direction of the pole and without lowering the strength of the pole. SOLUTION: The 1st engaging part is defined as an engage groove 82, which is opened on the side surface of a pole 8, formed on one face side of the pole 8 in the plate thickness-wise direction so as to be extended across the slide direction of the pole 8, and a wall part 83 to be the wall of the engage groove 82 is provided on the other face side of the pole 8 in the plate thickness-wise direction.

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.

[0002]

2. Description of the Related Art Conventionally, as this type of seat reclining device, those disclosed in Japanese Utility Model Laid-Open No. 1-169149 and Japanese Patent Laid-Open No. 7-136032 are known. This is because the ratchet formed on the upper arm on the seat back side and the pole that is slidably supported by the lower arm on the seat cushion side and engages with and disengages from the ratchet by the sliding action, and has the first engaging portion, and the upper arm and the lower arm. A release member is provided that is rotatably supported and that engages with the first engagement portion by a rotation operation, and a release member that slides the pawl by engagement of the first engagement portion and the second engagement portion. It is a thing.

In the former conventional device, the first engaging portion is a pin that is erected near the widthwise center of one side surface of the pole in the plate thickness direction. Further, in the latter conventional device, the first engaging portion is an engaging hole extending in a direction intersecting with the sliding direction of the pole, which is cut out so as to open on the side surface of the pole.

[0004]

However, in the former conventional device described above, an additional release lever forming a release member for forming the pin and the second engaging portion is required, and the number of parts is increased. Not only this, but also the projection of the pole from the pole of the pin in the plate thickness direction and the disposition of the release lever increase the size of the seat reclining device itself in the thickness direction.

Further, in the latter conventional device described above, since the first engaging portion of the pole that engages with the second engaging portion of the release member is a notched engaging hole, the pole plate The openings are formed on both the one surface and the other surface in the thickness direction. Therefore, considering the strength of the pole, it is difficult to increase the extension length of the first engaging portion that intersects the sliding direction of the pole, and as a result, considering the sliding amount of the pole with respect to the ratchet, the first relation is inevitable. The engagement between the mating portion and the second engaging portion starts from a position displaced from the vicinity of the center of the pole in the width direction, that is, close to the side surface of the pole. Therefore, when the first engaging portion and the second engaging portion are engaged with each other when the pole is slid, the pole may have a play in the sliding direction, or the force for sliding the pole may be small. As a result, the operation feeling of the release member may be deteriorated.

Therefore, according to the present invention, the engagement between the first engaging portion and the second engaging portion can be achieved without providing the member projecting in the plate thickness direction of the pole and without reducing the strength of the pole. The technical problem is to perform the process near the center in the width direction.

[0007]

In order to solve the above technical problems, the technical measures taken in the present invention are as follows. The first engaging portion crosses one side of the pole in the plate thickness direction with the sliding direction of the pole. And a wall portion serving as a wall of the engagement groove is formed on the other surface side of the pole in the plate thickness direction. .

According to this technical means, since the first engaging portion is the engaging groove formed in the pole, there is no member projecting in the plate thickness direction of the pole, and the wall portion prevents the pole from protruding. The strength is ensured, whereby the extending length of the engaging groove that intersects the sliding direction of the pawl, that is, the first engaging portion can be increased. Therefore, without providing a member protruding in the plate thickness direction of the pole and without reducing the strength of the pole,
The engagement between the engaging portion and the second engaging portion is obtained so as to be performed near the center of the pole in the width direction.

More preferably, it is preferable that the engagement groove has a cam-shaped engagement surface that is set so as to start engaging with the second engagement portion substantially in the vicinity of the center in the width direction of the pawl.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIGS. 2 and 3,
A lower arm 4 fixed to a seat cushion 1 (shown in FIG. 1) and an upper arm 2 fixed to a seat back 3 (shown in FIG. 1) rotatably support a rotating shaft 5 in a form penetrating both arms 4, 2. Has been done. The upper arm 2 is rotatable with respect to the lower arm 4 about a rotation shaft 5, and is rotatably supported by the lower arm 4 via a guide structure 6 around the rotation shaft 5. The guide structure is formed by fitting a convex portion 21 formed in the upper arm 2 with a half blank and a concave portion 41 formed in the lower arm 4.

At the portions of the lower arm 4 and the upper arm 2 through which the rotary shaft 5 penetrates, the rotary shaft support portions 42 and 22 are formed so as to be half-blanked toward the outside in the direction opposite to each other, and the lower arm 4 and the upper arm 2 are separated from each other. A space 7 through which the rotary shaft 5 is inserted is formed between the rotary shaft support portions 42 and 22. Also, this rotary shaft support portion 4
Due to the formation of Nos. 2 and 22, the upper arm 2 is formed with the ratchet 23 exposed to the space 7, and the lower arm 4 is exposed to the space 7 and is disposed between the ratchet 23 and the rotary shaft 5, respectively. Guide walls 43 and 44 are formed. The ratchet 23 has arcuate tooth portions 23 a having a predetermined width with the rotation shaft 5 as a center, and the pair of guide walls 43 and 44 extend parallel to the radial direction of the rotation shaft 7 and are adjacent to each other. Opposing. Further, the upper arm 2 is also formed with a pair of stopper walls 24 and 25 exposed to the space 7 and facing each other with the guide walls 43 and 44 interposed therebetween by forming the rotary shaft support portion 22.

A pole 8 and a cam 9 are arranged in the space 7. The pole 8 has a rectangular shape mainly including a rectangular main body portion 8d, is arranged around the rotating shaft 5, and is disposed between the guide walls 43 and 44 of the lower arm 4 between the main body portion 8d.
Is supported by the lower arm 4 slidably along the guide walls 43 and 44 in the radial direction of the rotating shaft 5 so that both side surfaces of the shaft contact the guide walls 43 and 44 with a predetermined clearance. The tooth portion 23a of the ratchet 23 of the body portion 8d of the pole 8
A tooth portion 8 a is formed on the surface facing the tooth portion 2 a of the ratchet 23 of the upper arm 2 by the sliding operation.
3a is engaged and disengaged. A cam surface 8b cam-shaped in the radial direction of the rotary shaft 5 is formed on the surface of the body 8d of the pole 8 opposite to the surface on which the teeth 8a are formed. The cam 9 is supported by the rotary shaft 5 so as to rotate integrally with the rotary shaft 5. A protrusion 9a is formed at a portion of the cam 9 that faces the cam surface 8b of the pole 8.
By the rotation operation, the cam surface 8b of the pawl 8 is contacted with and released from the contact, and the cam surface 8b of the pawl 8 and the projection 9a of the cam 9 are brought into contact with each other.
The pole 8 is pressed so as to slide by contact with the tooth 8a of the pole 8 and the tooth 23 of the ratchet 23.
It meshes with a.

As shown in FIGS. 3 and 4, in the rotary shaft support portion 42 of the lower arm 4, the guide walls 43 and 44 cross the tooth portion 23a of the ratchet 23 of the upper arm 2 and the space 7 guides the guide mechanism 6. The upper arm 2 is formed so as to exist up to a portion facing the protrusion 21 of the upper arm 2. As shown in FIGS. 3 to 5, the tooth portion 8a of the pole 8 is formed on the upper arm 2 side by half the plate thickness of the pole 8, and the wall portion 81 is formed on the remaining half thickness of the lower arm 4 side. Is formed. The wall portion 81 extends from the main body portion 8d so as to project from the tooth portion 8a and to connect the teeth of the tooth portion 8a, and the tooth portion 8a of the pole 8 and the tooth portion 23a of the ratchet 23 are formed. The protrusion 21 and the space 7 in the meshed state
The upper arm 2 is disposed at a portion facing the projection 21 and can be brought into contact with the guide walls 43 and 44 at the side surface 81a continuous from the side surface of the main body portion 8d.

As shown in FIGS. 3 and 4, the pole 8
In the main body portion 8d, the engagement groove 82 formed in a cam shape in the radial direction is formed.
However, the cam 9 is formed with engaging arms 9 b that can be engaged with the engaging groove 82 so as to extend in the circumferential direction of the rotating shaft 8. The engagement arm 9b is engaged, and the engagement causes the pawl 8 to slide so that the tooth portion 8a of the pole 8 and the tooth portion 23a of the ratchet 23 are disengaged. As shown in FIG. 3 to FIG. 5, the engagement groove 82 extends in the direction crossing the sliding direction of the pole 8 on the one surface 8c of the body portion 8d in the plate thickness direction and at approximately half the plate thickness of the body portion 8d. The main body 8
It has an opening on the side surface of d. This engaging groove 82 is used for the pole 8
Has a width such that the engaging arm 9b can enter in the sliding direction of, and the vertical surface intersecting the sliding direction of the pole 8 is
Radially cam-shaped engagement surface 8 that engages with the engagement arm 9b
2a. The engagement surface 82a is set so as to start engaging with the engagement arm 9b near the center of the pole 8 in the width direction. Further, the other surface 8e of the main body portion 8d in the plate thickness direction is provided with a wall portion 83 which is a wall of the engaging groove 82 with approximately half the remaining plate thickness of the main body portion 8d.

The ratchet 23, the pole 8, the guide walls 43 and 44, and the projection 9a of the cam 9 having the above-mentioned structure are
Another similar member is arranged, and a pair of members are arranged to face each other with the rotary shaft 5 interposed therebetween.

A spring 11 for urging the upper arm 2 to rotate counterclockwise in FIG. 1 with respect to the lower arm 4 is arranged around the rotary shaft 5, and the seat back 3 is
The urging force of the spring 11 causes the seat cushion 1 to be moved forward. A spring 12 for urging the rotary shaft 5 to rotate counterclockwise in FIG. 2 with respect to the lower arm 4 is also arranged around the rotary shaft 5.
The cam 9 receives the urging force of the spring 12 and the projection 9a comes into contact with the cam surface 8b of the pole 8 to maintain the meshing between the tooth 23a of the ratchet 23 and the tooth 8a of the pole 8. There is.

Next, the operation will be described.

In FIG. 2, the pair of pawls 8 are pressed by the abutment of the cam surface 8b of the pawl 8 and the projection 9a of the cam 9 so that the teeth 23a of the latch 23 and the teeth 8a of the pawl 8 are separated from each other. The upper arm 2 is engaged with the upper arm 2.
Are restricted from rotating with respect to the lower arm 4.

In this state, when the rotary shaft 5 is rotated clockwise against the urging force of the spring 12, the cam 9 rotates together with the rotary shaft 5 clockwise as shown in FIG.
By the rotation of the cam 9, the contact between the projection 9a and the cam surface 8a is released, the engaging arm 9b enters the engaging groove 82, and the engaging point P near the center of the pole 8 in the width direction (see FIG. 4), engagement with the engagement surface 82a of the engagement groove 82 is started, and the engagement groove 8
The pair of pawls 8 are slid toward the rotary shaft 5 by the engagement between the two engagement surfaces 82a and the engagement arms 9b. As a result, the engagement between the tooth portion 8a of the pole 8 and the tooth portion 23a of the set of ratchets 23 is released, and the upper arm 2 is rotated around the rotating shaft 5 while being guided by the guide mechanism 6 with respect to the lower arm 4. It will be possible. When the upper arm 2 is rotated with respect to the lower arm 4 against the biasing force of the spring 11 or receiving the biasing force of the spring 11 up to a desired rotation angle, and then the rotation operation of the rotary shaft 5 is released, the spring 12 is released. The rotating shaft 5 is rotated in the opposite direction to the biasing force of the pole 8 and the pole 8 is slid toward the ratchet 23. As a result, the tooth portion 8a of the pole 8 and the tooth portion 23a of the ratchet 23 mesh again. The rotation of the upper arm 2 with respect to the lower arm 4 is restricted. As a result, the tilt angle of the seat back 3 with respect to the seat cushion 1 is adjusted.
The rotation of the upper arm 2 with respect to the lower arm 4 is performed by rotating the seat back 3 with respect to the seat cushion 1.

[0020]

According to the present invention, it is possible to solve the above-mentioned technical problems, and thereby to improve the operation feeling of the release member.

[Brief description of drawings]

FIG. 1 is a side view of a seat equipped with a seat reclining device according to the present invention.

FIG. 2 is a plan view of a seat reclining device according to the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is an enlarged view corresponding to the upper half of FIG. 2 showing a pole of the seat reclining device according to the present invention.

FIG. 5 is a perspective view of a pole of the seat reclining device according to the present invention.

[Explanation of symbols]

 2 upper arm 4 lower arm 9 cam (release member) 8 pole 9b engaging arm (second engaging portion) 23 ratchet 82 engaging groove (first engaging portion) 83 wall portion 82a engaging surface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tokukura Katsuharu 26-26, Kotobuki-cho, Toyota City, Aichi Prefecture Nippon Powder Alloy Co., Ltd.Nagoya Branch (72) Inventor Hitoshi Yamamoto Kurisuno, Yamashina-ku, Kyoto City, Kyoto Prefecture 1 of 5 fox hills Yamashina Works of Nippon Powder Alloy Co., Ltd.

Claims (2)

[Claims] 1. A ratchet formed on either the upper arm on the seat back side or the lower arm on the seat cushion side, and a ratchet slidably supported on the other of the upper arm or the lower arm to engage or disengage from the ratchet. And a second engaging portion that is rotatably supported by the upper arm or the lower arm and that engages with the first engaging portion by a rotating operation. In a seat reclining device having a release member that slides the pawl by engaging the pawl with the second engaging portion, the first engaging portion is provided on one side in the plate thickness direction of the pawl in the sliding direction of the pawl. An engaging groove that is formed so as to extend in a direction that intersects with the side surface of the pole A seat reclining device including a wall portion serving as a wall of the engagement groove on the other surface side of the seat reclining device. 2. The engagement groove is provided with a cam-shaped engagement surface which is set so as to start engaging with the second engagement portion in the vicinity of substantially the center in the width direction of the pawl. Seat reclining device.