JP4318793B2 - Seat recliner structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a seat recliner structure.
[0002]
[Prior art]
Conventionally, a seat recliner structure interposed between a seat bottom and a seat back is known. The recliner structure includes a first bracket fixed to one of a seat bottom and a seat back attached to the seat bottom so as to be tiltable, and fixed to the other, and relative to the first bracket around a rotation center. It is interposed between the second brackets connected so as to be rotatable.
[0003]
The recliner structure is provided with a cam that is interposed between the first bracket and the second bracket, and is fixed so as to be able to rotate about a support shaft concentric with the rotation center. In this cam, a locking plate having a locking tooth on the tip surface is moved forward and backward in the radial direction between the first and second brackets by forward and reverse rotation of the support shaft. The first bracket is provided with a guide groove having opposing walls extending in the radial direction. The locking plate moves forward and backward in the guide groove by the rotation of the cam, so that the locking teeth are moved. It is designed to appear and disappear from the guide groove.
[0004]
On the other hand, the second bracket has internal teeth formed along an arc locus concentric with the rotation center. As a result, the lock plate protrudes outward from the guide groove by the rotation of the cam, and the engaging teeth mesh with the inner teeth, thereby restricting the relative rotation between the first bracket and the second bracket, and the cam. The first bracket and the second bracket can be rotated relative to each other by releasing the engagement of the locking teeth with the inner teeth by the reverse rotation of the first bracket.
[0005]
Therefore, by attaching an operating rod to the support shaft and rotating the support shaft forward and backward by operating this operating rod, the locking teeth can be engaged with the inner teeth and the tilt position of the seat back can be locked. It is possible to change the tilt position by releasing the meshing.
[0006]
[Problems to be solved by the invention]
By the way, in the conventional recliner structure as described above, there are sliding contact portions at various places such as between the opposing wall surface of the guide groove and the lock plate, and between the cam and the lock plate. However, since there is a gap, when a load is applied to the seat back, the locking teeth are tilted in the rotational direction, and the meshing strength with respect to the internal teeth is weakened, and there is a disadvantage that a reliable locked state cannot be obtained. .
[0007]
In order to eliminate such inconvenience, it is conceivable to improve the dimensional accuracy of the guide groove and the lock plate, thereby reducing the gap dimension between the opposing wall of the guide groove and the lock plate as much as possible. In addition, a very high-precision metal processing must be performed on the lock plate or the like, which raises a new problem that the processing cost increases.
[0008]
The present invention has been made to solve the conventional problems as described above, and provides a seat recliner structure capable of reliably improving the meshing strength of the locking teeth with respect to the internal teeth. It is aimed.
[0009]
[Means for Solving the Problems]
According to the first aspect of the present invention, the first bracket 2 fixed to one of the seat bottom S1 and the seat back S2 and the first bracket 2 fixed to the other and connected to the first bracket 2 so as to be relatively rotatable about a rotation center. The second bracket 3 formed, the cam 5 interposed between the first and second brackets 2 and 3 and rotatable about the rotation center, and the cam 5 linked to the forward and reverse rotation. The first and second brackets 2 and 3 are provided with a lock plate 4 protruding and protruding in the radial direction. The first bracket 2 is provided with a guide groove 25 for guiding the protrusion and protrusion of the lock plate 4 , while the second bracket 3 internal teeth 34 of locking teeth 41a and the meshing of the lock plate 4 the distal end of the protruding state from the guide groove 25 is provided on the support shaft around the cam 5 so that the lock plate 4 is protruded from the guide groove 25 Energize In recliner structure of a sheet urging means 84 is provided, the first bracket 2 is provided with a pair of arcuate guide member 22 which is膨設as separating distance from one another, of the guide member 22 A storage space 24 for storing the lock plate 4 and the cam 5 is formed therebetween, and guide protrusions 22a protruding in opposite directions are provided outside the storage space 24 in the radial direction. Are provided with guide surfaces 25a for guiding the lock plate 4 by forming the guide grooves 25 between the opposing surfaces, and extending from the storage space 24 to the guide surfaces 25a. A lock plate abutting surface 25b formed at a predetermined angle α with the surface 25a, and the lock plate 4 includes a locking tooth 41a. The tooth plate 41 has a contact protrusion 43a on the proximal end side of the locking tooth plate 41 and protruding on both sides of the locking tooth plate 41 to contact the lock plate contact surface 25b. The protruding piece 43a is in contact with the lock plate contact surface 25b over the range from the protruding tip to the locking tooth plate 41 in a state where the locking teeth 41a mesh with the internal teeth 34. The engagement tooth plate 41 is configured to prevent the inclination tooth plate 41 from tilting in the guide groove 25 when a load is applied to the back S2 .
[0010]
According to the present invention, transmitted to the locking teeth through the internal teeth this force by a load is applied to the seat back, the force inclined in the direction exerted a load in the guide groove in the locking plate occurs, this force is equivalent The contact piece is canceled by interfering with the edge of the guide groove at the back of the groove. Therefore, the inconvenience that the engagement state of the locking teeth with the inner teeth is deteriorated due to the inclination of the lock plate is solved, and thereby the tilted posture in which the seat back is set is reliably maintained.
[0011]
According to a second aspect of the present invention, the lock plate 4 is composed of a pair of members, and each includes a hook-shaped plate 42 that is integrally connected to the proximal end side of the locking tooth plate 41. The bowl-shaped plate 42 includes a lateral plate 43 extending in the lateral direction and a longitudinal plate 44 extending from the end of the lateral plate 43 in the direction opposite to the locking tooth plate 41. The front end of the vertical plate 44 of one lock plate 4 is formed on both end sides of the horizontal plate 43 and is attached to the side end surface of the horizontal plate 43 of the other lock plate 4 in a state where the front end portion is mounted in the accommodation space 24. The shape is set so as to abut .
[0017]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an explanatory view in a side view showing an embodiment of a reclining seat to which the recliner structure of the present invention is applied. As shown in this figure, a vehicle seat S includes a seat bottom S1 and a seat back S2, and the seat bottom S1 and the seat back S2 are connected to each other by a pair of recliners 1 so as to tilt forward and backward.
[0018]
2 is a partially cutaway exploded perspective view showing an embodiment of the recliner 1, FIG. 3 is an assembled perspective view thereof, and the recliner 1 includes a first bracket 2 fixed to the seat bottom S1, and a seat back S2. The second bracket 3 fixed to face the first bracket 2, the pair of lock plates 4 interposed between the brackets 2, 3, and the cam shaft 6 are rotated in the forward and reverse directions to rotate the pair. A cam 5 that moves the lock plate 4 in the direction of separating and moving, an operation lever 7 that operates the cam shaft 6 to rotate forward and backward about the axis, and a holding plate 8 that holds the operation lever 7 while preventing it from coming off. Has a basic configuration.
[0019]
The first bracket 2 is formed with a semicircular upper part and a lower lower part, and an insertion hole 21 through which the cam shaft 6 is inserted in a semicircular center of curvature. A pair of guide members 22 in the front-rear direction is bulged and raised on the surface inward in the width direction (left side in FIG. 2). Each guide member 22 is formed in an arc shape with the insertion hole 21 as the center, and the shape is set symmetrically with respect to the insertion hole 21.
[0020]
FIG. 4 is a perspective view of the X-ray view of FIG. 2, and a guide recess 23 extending in the vertical direction is provided on the opposing surface of each guide member 22. Accordingly, guide protrusions 22a are formed on the upper and lower portions of the guide members 22 so as to protrude in directions facing each other.
[0021]
An accommodation space 24 for accommodating the lock plate 4 and the cam 5 is formed between the opposing guide recesses 23, and a part of each lock plate 4 (a locking tooth described later) is provided between the opposing surfaces of the guide protrusion 22a. A pair of upper and lower guide grooves 25 are formed for fitting the plate 41) in a sliding contact state. Specifically, as shown in FIG. 6, the guide protrusions 22 a are provided with guide surfaces 25 a that guide the lock plate 4 by forming guide grooves 25 therebetween on opposing surfaces, respectively, and the above-described storage. A lock plate contact surface 25b extending from the space 24 to the guide surface 25a and having a predetermined angle α with the guide surface 25a is provided.
[0022]
Further, arc-shaped guide ridges 22b concentric with the outer peripheral surface of the guide member 22 are respectively provided on the surface of each guide member 22, and these guide ridges 22b are circular guide grooves 31a of the second bracket 3 described later. It is inserted in the sliding contact state.
[0023]
As shown in FIG. 2, the second bracket 3 is formed in a semicircular shape on the lower side and a substantially rectangular shape on the upper side. On the left side surface of the second bracket 3, a circular bulging portion 31 is bulged by raising the center of curvature of the semicircular portion, and the central portion of the circular bulging portion 31 includes the above-described portion. A through hole 32 facing the insertion hole 21 of the first bracket 2 is formed.
[0024]
A mounting recess 33 is provided on the right side of the circular bulge 31. The inner diameter dimension of the mounting recess 33 is set to be slightly larger than the radius of curvature of the pair of guide members 22, and the guide members 22 are arranged in a state where the first bracket 2 and the second bracket 3 are combined. The outer circumferential surface of the circular arc is fitted into the mounting recess 33 while being in sliding contact with the inner peripheral surface of the mounting recess 33.
[0025]
Further, a circular guide groove 31a concentric with the through hole 32 corresponding to the guide protrusion 22b is formed in the right side surface of the mounting recess 33, and the guide protrusion 22b is fitted into the circular guide groove 31a. The relative rotation between the first bracket 2 and the second bracket 3 is performed more stably. On the inner peripheral surface of the mounting recess 33, internal teeth 34 formed by being cut in the radial direction are provided so as to face each other in the vertical direction.
[0026]
The upper edge of the second bracket 3 is provided with attachment holes at the front and rear end portions, and the second bracket 3 is fixed to the seat back S2 by being bolted through the attachment holes. It has become. In addition, the second bracket 3 has a positioning projection that protrudes in the direction of the first bracket 2 between the front and rear mounting holes. These positioning projections are for positioning the mounting position of the presser plate 35 that holds the first bracket 2 so as not to be detached from the second bracket 3.
[0027]
Then, by fixing the presser plate 35 to the second bracket 3 in a state where the first bracket 2 is stacked on the second bracket 3, the presser plate 35 presses the upper portion while allowing the first bracket 2 to rotate. Thus, the upper portion of the first bracket 2 is prevented from being separated from the second bracket 3.
[0028]
Further, mounting holes are formed in the lower edge portion of the first bracket 2 at the front and rear ends, respectively, and the first bracket 2 is fixed to the seat bottom S1 by bolting through these mounting holes. It is like that.
[0029]
FIG. 5 is a front view showing an embodiment of the lock plate 4. FIG. 5A shows a state in which the locking teeth 41a of the lock plate 4 protrude outside from the guide groove 25, and FIG. The state immersed in the guide groove 25 is shown, respectively. As shown in FIG. 5, the lock plate 4 is integrally connected to the locking tooth plate 41 that is fitted in the guide groove 25 of the first bracket 2 so as to be movable up and down, and to the base end side of the locking tooth plate 41. And a bowl-shaped plate 42.
[0030]
The locking tooth plate 41 has locking teeth 41 a that mesh with the internal teeth 34 (FIG. 2) of the second bracket 3 formed at the front end edge, and the guide member 22 is fitted into the mounting recess 33. When the locking teeth 41a mesh with the internal teeth 34 in this state, the relative rotation between the first bracket 2 and the second bracket 3 is restricted.
[0031]
The saddle plate 42 is shaped so that the outer side edge is in sliding contact with the inner edge of the guide recess 23 and the inner edge is in sliding contact with the outer peripheral surface of the cam 5. And a longitudinal plate 44 extending in the opposite direction to the locking tooth plate 41 from a clockwise end portion of the lateral plate 43. The length dimension of the vertical plate 44 is set shorter than the vertical dimension of the guide recess 23 by a distance d so that the vertical plate 44 can move up and down within the guide recess 23 by a distance d.
[0032]
The distance d is set to be slightly larger than the tooth height dimension of the locking tooth 41a, and the locking tooth of the locking tooth plate 41 is moved when the bowl-shaped plate 42 moves radially outward from the insertion hole 21. While 41a meshes with the internal teeth 34, the hook-shaped plate 42 moves toward the insertion hole 21, so that the meshing of the locking teeth 41a with the internal teeth 34 is released.
[0033]
Further, the horizontal plate 43 and the vertical plate 44 are coupled at a substantially right angle, and a curved recess 45 for accommodating the cam 5 is formed in each inner portion of the horizontal plate 43 and the vertical plate 44. Further, at both end portions of the lateral plate 43, contact protrusions 43a that contact the guide protrusions 22a of the guide member 22 are provided, and the contact protrusions 43a contact the guide protrusions 22a, thereby the locking tooth plate. Inclination toward the direction of receiving the load 41 is prevented, so that the locking teeth 41a are always reliably engaged with the internal teeth 34.
[0034]
Further, an engaging projection 44a projecting toward the cam 5 is provided at a substantially central position of the vertical plate 44, and the engaging tooth plate 41 is caused to interfere with the rotating cam 5 by this engaging projection 44a. The guide groove 25 is immersed.
[0035]
In addition, the pair of lock plates 4 are mounted at point-symmetrical positions in the accommodation space 24 around the hole center of the insertion hole 21, and the leading end of one vertical plate 44 is connected to the other horizontal plate 43. The shape is set so as to be in contact with the side end face, and thereby the mounting state of each lock plate 4 in the accommodation space 24 is stabilized.
[0036]
The cam 5 includes a cam body 51 having a substantially elliptical shape, and a pair of pressing protrusions 52 projecting outward from the edge of the point symmetry position of the cam body 51. A hexagonal hole 53 through which the cam shaft 6 is inserted is formed in the central portion of the cam body 51. On the other hand, as shown in FIG. 3, the cam shaft 6 crosses the seat bottom S <b> 1 and is bridged between the left and right recliners 1 so that the operation of the operation lever 7 reaches both recliners 1. Specifically, the cam shaft 6 is dimensioned so as to be slidably fitted into the hexagonal hole 53, and the cam 5 of one recliner 1 is rotated by operating the operation lever 7. 5 is transmitted to the cam 5 of the other recliner 1 via the cam shaft 6 so that the other cam 5 rotates synchronously with the one cam 5 around its axis.
[0037]
As shown in FIG. 5, the pair of pressing protrusions 52 are provided corresponding to the engaging protrusions 44 a respectively protruding from the vertical plate 44 of each lock plate 4, and are in the state shown in FIG. As the cam 5 rotates clockwise around the cam shaft 6, the pressing projection 52 presses the engaging projection 44 a, whereby the lock plate 4 is engaged with the locking teeth 41 a as shown in FIG. Is located at the unlocking position immersed in the guide groove 25.
[0038]
FIG. 6 is an explanatory diagram for explaining the relative positional relationship between the lock plate 4 and the cam 5. In FIG. 6, only the upper one of the pair of lock plates 4 at the point-symmetrical position is shown. Therefore, the lower lock plate 4 (not shown) is opposite to the upper one in the left and right and up and down directions.
[0039]
As shown in FIG. 6, the cam main body 51 is set on a center line A in which the rotation center O extends in the vertical direction. The cam body 51 is formed with a first arc edge 51a on the left side of the center line A in a locked posture in which the locking teeth 41a of the locking tooth plate 41 protrude from the guide groove 25 to the outside. In addition, a second arc edge 51b having a radius of curvature larger than that of the first arc edge 51a is formed on the right side of the center line A. Further, a straight chord edge 51c is formed on the right side of the second arc edge 51b, and a third arc edge 51d is formed following the chord edge 51c.
[0040]
On the other hand, the lock plate 4 has a concave arc edge facing the curved concave portion 45 at the left and right positions of the center line A in the saddle-shaped plate 42 portion in a state of sliding in contact with one of the first and second arc edge portions 51a and 51b. A portion 45a is formed on the right side of the concave arc edge 45a. The escape arc edge 45b is not contacted by the second arc edge 51b even when the cam body 51 is rotated clockwise around the rotation center O. Is formed.
[0041]
In the present invention, an inclined line B that is inclined from the center line A to the right by the follow-up angle θ is set with the intersection point P between the center line A and the concave arc edge 45a as a base point. The arc surfaces of the two arc edge portions 51a and 51b have the arc center O1 set on the inclined line B, and the curvature radius R0 of the first arc edge portion 51a is slightly larger than the curvature radius R1 of the second arc edge portion 51b. The dimensions are set to small.
[0042]
In addition, the arc center O2 of the concave arc edge 45a of the lock plate 4 is set on the inclined line B and slightly below the arc center O1 of the first and second arc edges 51a and 51b. The radius of curvature R2 of the concave arc edge 45a is slightly larger than the radius of curvature R1 of the second arc edge 51b of the cam body 51.
[0043]
By setting the relative dimensional relationship between the cam main body 51 and the curved concave portion 45 of the lock plate 4 as described above, as shown in FIG. If a load F is applied to the locking teeth 41a of the lock plate 4, the load F acts on the lock plate 4 as a moment with the point Q at the right end of the second arc edge 51b as a fulcrum. Compared to the case where the fulcrum position is on the left side of the point Q (for example, the direction of the moment when the fulcrum is present at the intersection P is indicated by a two-dot chain line arrow for reference), 41a more bites into the inner teeth 34 of the second bracket 3, and the amount of escape from the inner teeth 34 of the locking teeth 41a at the right end is reduced, whereby the locking teeth 41a are more securely connected to the inner teeth 34. Meshing with Becomes, the meshing strength between them improves.
[0044]
As shown in FIG. 2, the operation lever 7 includes an L-shaped plate 71 having an L-shape and a handle 72 attached to the tip of the L-shaped plate 71. An insertion hole 73 for inserting the camshaft 6 is formed in the upper end portion of the L-shaped plate 71, and a pair of cut and raised pieces 74 are inserted through the first bracket 2 across the insertion hole 73. While protruding from the hole 21, the cam 5 is provided with a locking hole 54 into which the cut piece 74 is inserted. With the cam 5 and the L-shaped plate 71 sandwiching the first bracket 2, the operation lever 7 is operated by the operation of the handle 72 so that the operation lever 7 is moved to the cam shaft by cutting and raising into the locking hole 54. The cam 5 rotates about the cam shaft 6 by rotating around the cam shaft 6.
[0045]
The operating lever 7 is configured such that the holding plate 8 is attached to the first bracket 2 with the rivet 76 in a state where the cut and raised piece 74 is inserted into the insertion hole 21 of the first bracket 2 and inserted into the locking hole 54 of the cam 5. By being caulked, it is prevented from coming off, so that the mounting state of the operating lever 7 to the first bracket 2 is stabilized.
[0046]
As shown in FIG. 2, the holding plate 8 includes a plate body 81 that holds the L-shaped plate 71 of the operation lever 7, and an arc plate 82 that protrudes outward from the upper edge of the plate body 81. It is made up of. On the rear end of the lower edge portion of the plate body 81, a spring-hanging protrusion 83 is protruded. On the L-shaped plate 71 of the operation lever 7, a spring-hanging protrusion 75 is also protruded. , 83, the operating lever 7 is urged counterclockwise around the cam shaft 6 by tensioning the coil spring 84.
[0047]
The operation lever 7 is urged counterclockwise around the cam shaft 6, so that the cam 5 also moves counterclockwise around the cam shaft 6 via the cut and raised piece 74 of the operation lever 7. Therefore, the second arc edge 51b (FIG. 6) of the cam 5 presses the lock plate 4 outward in the radial direction. The locking teeth 41a are engaged with the internal teeth 34 of the second bracket 3 by the protrusion of the locking teeth 41a from the guide groove 25 to the outside, and usually the rotation of the second bracket 3 around the cam shaft 6 is restricted. It has become.
[0048]
By operating the operation lever 7 upward in this state, the cam 5 rotates clockwise around the cam shaft 6, and the locking teeth 41 a are pressed by the pressing protrusions 52 a by the pressing protrusions 52 of the cam 5. The engagement with the inner teeth 34 of the locking teeth 41a is released by immersing in the guide groove 25 of the first bracket 2, whereby the tilting posture of the seat back S2 can be arbitrarily set.
[0049]
Further, the holding plate 35 is also provided with a spring hooking protrusion 35a protruding rightward in FIG. 2, and between the spring hooking protrusion 35a and the front edge of the arc plate 82 of the holding plate 8. A spiral spring 9 is mounted on the The spiral spring 9 causes the second bracket 3 to receive a biasing force counterclockwise around the cam shaft 6 via the presser plate 35, so that the seat back S2 is always in a forward-facing posture via the second bracket 3. It is so energized.
[0050]
【The invention's effect】
According to the first aspect of the present invention, the movement of the lock plate that is inclined in the load direction in the guide groove when a load is applied to the seat back in a state in which the locking teeth are engaged with the inner teeth, the groove edge at the back of the guide groove Since the locking plate is provided with a locking projection that prevents it from interfering with the lock plate, when a load is applied to the seat back, this force is transmitted to the locking tooth via the inner teeth, and the load is applied to the locking plate in the guide groove. However, this force can be counteracted by interference of the locking projections with the edge of the back of the guide groove to prevent the lock plate from tilting. Therefore, the inconvenience that the engagement state of the locking teeth with the inner teeth is deteriorated due to the inclination of the lock plate is solved, and the tilted posture in which the seat back is set can be reliably maintained.
[Brief description of the drawings]
FIG. 1 is a side view illustrating an embodiment of a reclining seat to which a recliner structure of the present invention is applied.
FIG. 2 is a partially cutaway exploded perspective view showing an embodiment of a recliner.
3 is an assembled perspective view of the recliner shown in FIG. 2. FIG.
4 is a perspective view of the X-ray view of FIG. 2. FIG.
FIGS. 5A and 5B are front views showing an embodiment of the lock plate, where FIG. 5A is a state in which the locking teeth of the lock plate protrude outward from the guide groove, and FIG. 5B is a state in which the locking teeth are immersed in the guide groove. Each state is shown.
FIG. 6 is an explanatory diagram for explaining the relative positional relationship between the lock plate and the cam.
[Explanation of symbols]
2 First bracket 3 Second bracket 25 Guide groove 4 Lock plate 41 Locking tooth plate 41a Locking tooth 42 Trapezoidal plate 44a Locking protrusion 5 Cam 6 Cam shaft 7 Operating lever 8 Holding plate 45 Curved recess A Center line θ Corner B additional line 51b second arc edge R1 radius of curvature R2 of second arc edge R2 radius of curvature of curved recess (concave arc edge)

Claims (2)

The first bracket (2) fixed to one of the seat bottom (S1) and the seat back (S2 ) and the first bracket (2) fixed to the other and connected to the first bracket (2) so as to be relatively rotatable about the rotation center. The second bracket (3) , the cam (5) interposed between the first and second brackets (2) and (3) and rotatable about the rotation center, and the cam (5) A lock plate (4) protruding and retracting in a radial direction between the first and second brackets (2) and (3) in linkage with forward and reverse rotation is provided, and the first bracket (2) has a lock plate (4). on one of the guide grooves for guiding the retractable (25) is provided, the lock plate (4) of the second bracket (3) protruding state from the guide groove (25) the tip of the locking teeth and (41a) meshed inner teeth (34) is provided for, the lock plate (4) is In recliner structure of a sheet urging means (84) is provided for biasing the cam (5) to the support axis so as to protrude from the serial guide groove (25),
The first bracket (2) includes a pair of arcuate guide members (22) bulged so as to be separated from each other, and between these guide members (22), a lock plate (4) and A storage space (24) for storing the cam (5) is formed, and a guide protrusion (22a) protruding in a direction facing each other is provided outside the storage space (24) in the radial direction,
Each of the guide protrusions (22a) includes guide surfaces (25a) for guiding the lock plate (4) by forming the guide grooves (25) between the opposing surfaces facing each other. A lock plate contact surface (25b) extending from the space (24) to the guide surface (25a) and formed at a predetermined angle (α) with the guide surface (25a);
The locking plate (4) includes a locking tooth plate (41) having the locking teeth (41a) and both sides of the locking tooth plate (41) on the base end side of the locking tooth plate (41). A contact protrusion (43a) that protrudes to the side and contacts the lock plate contact surface (25b),
The contact projecting piece (43a) is in a state where the locking teeth (41a) mesh with the internal teeth (34) and extends over the range from the protruding tip to the locking tooth plate (41). A load is applied to the seat back (S2) in contact with the lock plate abutting surface (25b) so that the locking tooth plate (41) is prevented from tilting in the direction of the load in the guide groove (25). The seat recliner structure is characterized in that it is configured as follows. The lock plate (4) is composed of a pair, and each includes a hook-shaped plate (42) integrally connected to the proximal end side of the locking tooth plate (41),
The saddle plate (42) includes a lateral plate (43) extending in the lateral direction and a longitudinal plate (44) extending from the end of the lateral plate (43) in the opposite direction to the locking tooth plate (41). Become
The contact protrusion (43a) is formed on both end sides of the horizontal plate (43),
The distal end portion of the vertical plate (44) of one lock plate (4) is in contact with the side end surface of the horizontal plate (43) of the other lock plate (4) in a state of being mounted in the accommodation space (24). 2. The seat recliner structure according to claim 1 , wherein the shape is set as described above.

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