JP3578821B2 - Seat reclining device - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a seat reclining device for an automobile or the like.
[0002]
[Prior art]
The seat reclining device is a seat device in which the inclination angle of the seat back can be set as desired within a predetermined range for the purpose of ensuring a safe driving posture of the driver and comfortable seating.
[0003]
By the way, the applicant has filed a patent application to provide a new seat reclining device at the same time as the present application. In this seat reclining device, a center shaft protrudes from a base plate, a tooth plate is rotatably fitted to the center shaft, and an arc portion having a predetermined radius centered on the center shaft on the base plate side is provided on the tooth plate. A guide having a concave portion formed therein, an inner peripheral tooth portion formed in an arc portion of the concave portion, and a tooth member having a lock tooth portion meshing with the inner peripheral tooth portion formed in the concave portion and the base plate facing the concave portion. And a cam member for slidably moving the tooth member is accommodated in the concave portion and the guide portion so as to be rotatable by an operation lever.
[0004]
[Problems to be solved by the invention]
However, according to the seat reclining device described above, since the tooth member having the lock tooth portion that meshes with the inner peripheral tooth portion of the tooth plate is interposed between the tooth plate and the base plate, the tooth plate and the base plate are separated. If this occurs, there is a problem that the engagement strength between the lock teeth and the inner peripheral teeth decreases, and the reclining lock is impaired.
[0005]
In view of the above circumstances, the present invention provides a separation prevention structure for a seat reclining device in which a tooth member is sandwiched between a tooth plate and a base plate in the plane of the tooth plate.
[0006]
[Means for Solving the Problems]
In the seat reclining device according to the present invention, a tooth plate is rotatably fitted to a center shaft of a base plate, and a concave portion having an arc portion of a predetermined radius centered on the center shaft is formed on the base plate side of the tooth plate. An inner peripheral tooth portion is formed in an arc portion of the concave portion, and a tooth member having a lock tooth portion meshing with the inner peripheral tooth portion is slidably received in the concave portion and a guide portion formed on a base plate facing the concave portion. A cam member for sliding the tooth member is rotatably housed in the concave portion and the guide portion by an operation lever, and the arc member of the tooth plate is rotatably pressed to cooperate with the center shaft and the tooth member. the surround providing at least a pair of pressing members spaced on the base plate and the base plate and tooth plate To form the embossed convex portion around the respectively said center shaft, characterized in that fitted to the outer peripheral portion of the embossing protrusions of the base plate to the inner peripheral portion of the embossed convex portions of the tooth plate.
[0007]
[Action]
The inner peripheral portion of the embossed convex portion of the tooth plate and the outer peripheral portion of the embossed convex portion of the base plate are rotatably fitted, and the tooth plate is pressed against the center shaft and the base plate via at least a pair of spaced-apart pressing members. The tooth plate is prevented from peeling at at least three points surrounding the tooth member.
[0008]
【Example】
An embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, a tooth plate 3 is rotatably supported via a center shaft 2 fixed to a base plate 1 by a caulking portion 2b. The tooth plate 3 has an arc portion 3a having a predetermined radius centered on the center shaft 2, and at least a pair of flat head pins 4 having a shaft portion with which the peripheral edge portion of the arc portion 3a slides are separated from each other as a pressing member. 1 is planted.
[0009]
The center shaft 2 has a step or a flange 2a, and the tooth plate 3 has an embossed convex portion 3b abutting on the flange 2a, and a hole 3c through which the intermediary shaft 2 is inserted is formed at the center of the embossed convex portion 3b. Have been. The operation lever 5 is rotatably fitted to the outer peripheral portion of the embossed convex portion 3b while being held down by the flange 2a, and the embossed convex portion 1a of the base plate 1 is fitted to the inner peripheral portion of the embossed convex portion 3b. At the center of the embossed projection 1a, an oval shaped hole 1b of an oval shape or the like is formed, and the different diameter cross section 2c of the center shaft 2 is fitted into the hole 1b. The back surface of the embossed convex portion 1a is fixed by caulking with a caulking portion 2b.
[0010]
The operation lever 5 is formed with a long slot 6 that is inclined in the plane of the tooth plate 3. A return spring 7 is mounted between the operation lever 5 and the flat head pin 4. The inner end of the spiral spring 8 is hooked to the center shaft 2, and the outer end of the spiral spring 8 is hooked to a spring hook 3 d formed on the tooth plate 3. The spring retaining portion 3d is formed to be bent between the connecting portions 10a having the bolt insertion holes 10 for connecting the seat back frame 9.
[0011]
A long hole 11 is formed in the tooth plate 3 on a circumference of a predetermined radius centered on the center shaft 2, and the operation pin 12 is engaged with the long hole 11 and the long hole 6 of the operation lever 5. A cam member 13 is sandwiched between the base plate 1 and the tooth plate 3 so as to rotate and slide vertically. A tooth member 14 is sandwiched between the base plate 1 and the tooth plate 3 so as to be engaged with and disengaged from the cam member 13 and slidable in the vertical direction. The cam member 13 and the tooth member 14 are located in a triangular plane surrounded by a pair of spaced flat head pins 4 and 4 and the center shaft 2.
[0012]
The cam member 13 and the tooth member 14 form a lock mechanism together with the operation lever 5. As shown in FIG. 3, the cam member 13 and the tooth member 14 are formed in an embossed recess 15 formed in the base plate 1 and the tooth plate 3. It is housed in the formed embossed recess 16.
[0013]
The embossed concave portion 15 has a side portion 15a in a substantially quadrangular portion, and the tooth member 14 slides on the side portion 15a and acts as a guide portion to be fitted movably in the radial direction of the center shaft 2. Further, the embossed concave portion 15 has an arc portion 15b in a substantially circular portion, and the substantially circular shaft portion 21 of the cam member 13 is rotatably fitted to the arc portion 15b.
[0014]
The embossed recess 16 is substantially fan-shaped with a predetermined radius centered on the center shaft 2, and inner circumferential teeth 17 are formed on the inner circumferential surface of the circular arc portion at a predetermined pitch within a predetermined range. A lock tooth portion 18 meshing with the inner peripheral tooth portion 17 is formed at a lower edge of the tooth member 14.
[0015]
The hook part 19 is integrally formed on the upper part of the tooth member 14, and the lever part 20 of the cam member 13 is disengaged from the hook part 19. That is, the cam member 13 includes a lever portion 20 having a shape capable of entering the hook portion 19, a substantially circular shaft portion 21 fitted into the arc portion 15 b of the embossed recess 15, and a shaft portion 22 projecting the operation pin 12. Are integrally formed. The shaft portion 22 is loosely fitted in an arc portion 15c formed below and adjacent to the arc portion 15b of the embossed concave portion 15.
[0016]
The operation pin 12 extends to both sides of the cam member 13 by a predetermined length, and the extended operation pin 12 forms an elongated hole 23 in the base plate 1 and projects to the back side of the base plate 1. The long hole 23 is formed at a predetermined length on the same line as a line connecting the center shaft 2 and the operation pin 12.
[0017]
As shown in FIG. 4, the operation pin 12 is formed as a pin with a flange to form a stepped portion 13 a by thinning the portion of the cam member 13 through which the operation pin 12 is inserted to be caulked and connected to the cam member 13 as a flanged pin. The flange 12a and the caulked portion 12b are accommodated in the step portion 13a, and the flanges 12a and the caulked portion 12b are not protruded from both sides of the cam member 13 on both sides of the cam member 13, so that the diameters of the long holes 11, 23 are reduced. In addition, it is possible to prevent the strength from being reduced due to the perforation.
[0018]
When assembling the above structure, the operation lever 5, then the tooth plate 3, and finally the cam member 13 and the tooth member 14 are housed in the embossed recess 15, and the base plate 1 is fitted to the center shaft 2. After that, the head 2a of the center shaft 2 is crimped to the base plate 1.
[0019]
A shaft section 2d having a circular cross section is formed on the caulking section 2b side of the center shaft 2, and a connecting pipe 24 is rotatably fitted to the shaft section 2d, and a link lever 25 is attached to one end of the connecting pipe 24. Are connected together. A hole 26 into which the operation pin 12 is fitted is formed at an end of the link lever 25. The connecting pipe 24 extends to the other seat reclining device disposed on the inner side of the seat device to make it interlock.
[0020]
Next, the operation of the above embodiment will be described. When the reclining adjustment is performed, that is, when the tooth plate 3 is tilted, the operation lever 5 is rotated clockwise about the center shaft 2 so as to engage with the oblong slot 6 as shown in FIG. The corresponding operating pin 12 is pushed up obliquely upward, whereby the cam member 13 rotates clockwise about the shaft portion 21, the lever portion 20 enters the hook portion 19, and the tooth member 14 is moved into the embossed recess 15. Since it is pushed up along the side part 15a, the engagement between the lock tooth part 18 and the inner peripheral tooth part 17 is released. Therefore, the tooth plate 3 rotates counterclockwise about the center shaft 2 by the urging force of the spiral spring 8.
[0021]
Then, when the seat back frame 9 is set at a desired inclination angle and the operation lever 5 is released, the operation lever 5 returns to the original state by the force of the return spring 7, and as shown in FIG. The operation pin 12 is pushed down through the elongated hole 6, the cam member 13 rotates counterclockwise about the shaft portion 21, and the lever portion 20 pushes down the tooth member 14 via the hook portion 19, so that the lock is performed. The teeth 18 and the inner peripheral teeth 17 mesh to lock the reclining angle. When the lock tooth portion 18 and the inner peripheral tooth portion 17 mesh with each other, a tooth is formed on a line connecting a portion where the lever portion 20 of the cam member 13 contacts the tooth member 14 and a portion where the shaft portion 21 contacts the arc portion 15b. A resistance is formed that opposes a force that tries to release the engagement of the member 14 (a force that pushes up the tooth member 14).
[0022]
Thus, the force applied to the tooth member 14 is received by the embossed concave portion 15b of the base plate 1 via the cam member 13 and is not directly loaded on the operation lever 5 via the operation pin 12, so that the operation of the operation lever 5 Becomes lighter. Further, while the arc portion 3a of the tooth plate 3 is pressed by the flat head pin 4 implanted in the base plate 1, the cam member 13 and the tooth member 14 are formed in a triangular shape surrounded by the pair of spaced flat head pins 4, 4 and the center shaft 2. Since it is located in the plane, the tooth member 14 and the cam member 13 sandwiched between the base plate 1 and the tooth plate 4 do not peel off and are safe.
[0023]
In the present embodiment, the tooth member 14 and the cam member 13 are accommodated in the embossed concave portion 15 formed on the base plate 1, but an embossed convex portion is formed on the base plate 1 and this embossed convex portion is used as a guide portion. Alternatively, the tooth member 14 may be slidably accommodated and the shaft portion 21 may be rotatably supported.
[0024]
【The invention's effect】
According to the present invention described above, the outer peripheral portion of the embossed convex portion of the base plate is fitted to the inner peripheral portion of the embossed convex portion of the tooth plate , and the tooth plate is attached to the base plate by the center shaft and at least one pair of spaced pressing members. The cam member and the tooth member are located in a plane surrounded by the center shaft and the pressing member, so that the strength of the engagement between the locking tooth portion and the inner peripheral tooth portion is insufficient. Disappears.
[0025]
Further, since the operation lever is fitted to the embossed convex portion of the tooth plate, a situation in which the center shaft is caulked to the base plate and sandwiched between the steps or the flanges and the operation becomes heavy does not occur.
[Brief description of the drawings]
1 is a front view of a seat reclining device showing an embodiment of the present invention; FIG. 2 is a cross-sectional side view of FIG. 1; FIG. 3 is a plan view of a main part of FIG. 1; (A) and (B) are explanatory diagrams of the operation of the lock mechanism.
DESCRIPTION OF SYMBOLS 1 ... Base plate 2 ... Center shaft 3 ... Tooth plate 4 ... Flat head pin 5 ... Operating lever 6 ... Long hole 7 ... Return spring 8 ... Spiral spring 11, 23 ... Long hole 12 ... Operating pin 13 ... Cam member 14 ... Tooth member 15 , 16 ... embossed recess 17 ... inner peripheral teeth 18 ... lock teeth 19 ... hook 20 ... lever 21 ... shaft

Claims (3)

A tooth plate is rotatably fitted to the center shaft of the base plate, and a concave portion having a circular arc of a predetermined radius centered on the center shaft is formed on the base plate side in the tooth plate, and an inner peripheral portion is formed in the circular arc portion of the concave portion. A tooth member having a tooth portion and having a lock tooth portion meshing with the inner peripheral tooth portion is slidably accommodated in the concave portion and a guide portion formed on the base plate facing the concave portion, and the tooth member is slid. A cam member is rotatably accommodated in the concave portion and the guide portion by an operation lever, and at least a pair of pressing members surrounding the tooth member together with the center shaft by rotatably pressing an arc portion of the tooth plate are provided on a base plate. apart provided, and a circle centered respectively on the base plate and tooth plate the center shaft To form a scan protrusions, the seat reclining apparatus is characterized in that fitted to the outer peripheral portion of the embossing protrusions of the base plate to the inner peripheral portion of the embossed convex portions of the tooth plate. Center shaft has a stepped portion or the flange portion, it forms the shape of the embossing convex portion abutting the stepped portion or the flange portion to the rotational center portion of the tooth plate, by comprising the center shaft to the base plate by caulking The seat reclining device according to claim 1, wherein: The center shaft has a step or a flange, and an embossed projection that contacts the step or the flange is formed at the center of rotation of the tooth plate, and an operation lever is rotatably fitted to the embossed projection. and, seat reclining device according to claim 1, characterized by being the center shaft to the base plate by caulking.

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