JP5906092B2 - Angle adjustment mechanism and method for manufacturing seat reclining device - Google Patents

Description

  The present invention provides an angle adjusting mechanism that is interposed between one member and another member, and that can adjust the rotation angle of the other member with respect to the one member in multiple stages, and a seat that employs the angle adjusting mechanism. The present invention relates to a reclining device.

  As a seat reclining device for adjusting a tilt angle of a seat back with respect to a seat bottom in a vehicle seat or the like, those described in Patent Documents 1 to 3 are known. This type of seat reclining device has an inward ratchet member (for example, a member denoted by reference numeral 130 in FIG. 1 of cited document 1) having a cylindrical peripheral wall portion in which a plurality of inward engagement teeth are formed on the inner peripheral surface. And a slide member that is arranged on the inner side of the peripheral wall portion of the inward ratchet member and has an outward meshing tooth for meshing with the inward meshing tooth (for example, reference numeral 140 in FIG. And a base member (for example, denoted by reference numeral 100 in FIG. 1 of the cited document 1) that is arranged inside the peripheral wall portion of the inward ratchet member and guides the slide member in the radial direction of the inward ratchet. And a sliding member that is arranged at the inner center portion of the peripheral wall portion of the inward ratchet and pushes the slide member radially outward of the inward ratchet Rotating cam member (e.g., represented by element by reference numeral 170 in FIG. 1 of the cited document 1) and a. Hereinafter, this type of seat reclining device is referred to as an “inward ratchet type seat reclining device”.

  In the inward ratchet type seat reclining device, when the rotating cam member pushes the slide member outward and the outward meshing teeth of the slide member mesh with the inward meshing teeth of the inward ratchet member, The direction ratchet member and the base member are in a locked state where they cannot be rotated relative to each other, and the seat back cannot be rotated relative to the seat bottom. On the other hand, when the rotating cam member rotates and the slide member slides inward, the unlocked state is released in which the engagement between the outward meshing teeth of the slide member and the inward meshing teeth of the inward ratchet member is released. Thus, the seat back can be rotated (the seat back tilt angle can be adjusted). The operation of the rotating cam member is usually performed by operating a lever or the like provided on the side of the seat bottom. The inward ratchet type seat reclining device has been capable of adjusting the inclination angle of the seat back in multiple steps with a simple operation, but has the following drawbacks.

  That is, in the inward ratchet type seat reclining device, in the locked state, the inward engagement teeth of the inward ratchet member and the outward engagement teeth of the slide member are all of the inner peripheral surface of the peripheral wall portion of the inward ratchet member. Instead of meshing over the periphery, the structure is such that it meshes locally only in a specific section of the inner peripheral surface of the peripheral wall. Further, the inward ratchet type seat reclining device is configured such that the load applied to the seat back in the locked state is locally applied to a contact portion between one side surface of the slide member and one wall surface of the guide groove of the slide member of the base member. It was such a structure. For this reason, in the inward ratchet type seat reclining device, in order to maintain the locking force between the inward ratchet member and the slide member, or to ensure the strength of the inward ratchet member, slide member, and base member. It has been necessary to increase the thickness of these members or to use a special hard metal as a material for forming these members. Accordingly, not only is it difficult to reduce the weight and size of the seat reclining device, but these members cannot be processed unless special press processing is performed, and as a result, the manufacturing cost of the seat reclining device may increase. there were.

JP 2004-105360 A JP 2008-178532 A JP 2011-105123 A

  The present invention solves the above-mentioned problems, and each member constituting the same can be made thin without being formed of a special hard metal, and the locking force is maintained and the strength of each member is achieved. It is possible to provide an angle adjustment mechanism that can be easily secured, and can be easily reduced in weight, size, and cost. It is also an object of the present invention to provide a seat reclining device that employs this angle adjustment mechanism.

The above issues
An angle adjustment mechanism using a clutch mechanism that is connected to the second member and the first member, and is connected to and separated from each other by the engagement and separation of the second Kikuza plate and the first Kiza seat plate facing each other,
A second Kiza seat plate having a fitting wall portion on the surface facing the second member side, and provided with meshing teeth A on a peripheral portion (not only the edge but also the vicinity of the edge; the same applies hereinafter) of the surface. When,
A first Kikuza that has a second cam opening at the periphery, a mounting opening at the center, and a meshing tooth B at a location facing the meshing tooth A on the surface facing the first member. Plates,
A plurality of fitting protrusions provided on the peripheral edge are combined with the second wall plate by being fitted to the fitting wall, and the surface facing the second member becomes the second mounting seat. A second member mounting bracket that is attached to the second member through the mounting opening of the monolith plate,
A cam plate that has a second cam convex portion and a first cam opening at the peripheral portion, a separation claw that acts on the second star seat plate, and moves the second star seat plate in the axial direction;
An operating shaft connected to the center of the cam plate;
A case having a first cam convex portion at the peripheral portion and a surface facing the first member side serving as a first mounting seat and attached to the first member;
Consists of
A hollow joined body was formed by fixing the case with the first member plate covering the opening end of the case on the second member side, and the distance between the second mounting seat and the first mounting seat was kept constant. And house the main components inside the case,
When the operating shaft is rotated and the cam plate rotates, the second cam convex portion acts on the second cam opening portion, and at the same time, the first cam convex portion acts on the first cam opening portion, The cam plate is moved in the axial direction so that the meshing tooth A of the second seat plate and the meshing tooth B of the first seat plate are engaged (locked) and separated (unlocked). This is solved by providing an angle adjustment mechanism.
Here, the terms “second cam convex portion”, “second cam opening portion”, “first cam convex portion”, and “first cam opening portion” are used for convenience of explanation, A configuration in which the cam convex portion and the second cam opening portion are reversed or a configuration in which the first cam convex portion and the first cam opening portion are reversed is also within the technical scope of the present invention. Shall be included.

  The angle adjusting mechanism of the present invention aims at high strength and light weight, and the meshing tooth A provided at the peripheral edge portion of the second star plate and the meshing tooth B provided at the peripheral portion of the first star plate. Are engaged with each other in a wide range of the entire section (entire peripheral portion), not in a part of the peripheral portion of the second and first plate. The load applied to the tooth B can be dispersed. For this reason, the locking force (engagement) can be achieved without forming the second Kikuza plate or the first Kikuza plate with a special hard metal, or without increasing the thickness of the second Kikuza plate or the first Kikuza plate. Force) and the strength of the second Kikuza plate and the first Kikuza plate can be secured. Therefore, the angle adjustment mechanism can be easily reduced in weight, size, and cost.

  Further, in the angle adjustment mechanism of the present invention, the plurality of fitting convex portions provided on the peripheral edge portion of the second member mounting bracket are fitted to the fitting wall portion of the second star seat plate, The load applied to the second member or the first member in the locked state in which the meshing teeth A and the meshing teeth B mesh with each other is a side surface of the plurality of fitting convex portions (a portion having a long developed length) in the second member mounting bracket. ) Will be distributed. For this reason, even if the second Kikuza plate or the second member mounting bracket is not formed of a special hard metal or the like, or the second Kikuza plate or the second member mounting bracket is not thickened, the first It is possible to ensure the strength of the Nikujo seat plate and the second member mounting bracket. Therefore, further weight reduction, size reduction, and cost reduction of the angle adjustment mechanism are facilitated.

  Furthermore, in the angle adjustment mechanism of the present invention, the operation shaft is provided with an operation lever for rotating the operation shaft, and when the operation force is no longer applied to the operation lever, the operation lever is returned to the initial position. It is also preferable to provide an automatic locking urging means for urging the operating shaft or the operating lever so that the second chin seat plate and the first chin seat plate automatically mesh with each other. As a result, it is only necessary to apply an operating force to the operating lever only when it is desired to adjust the angle, and the operation can be simplified. It is preferable to use a coil spring (torsion spring) fitted around the end of the operation shaft as the automatic locking urging means because the structure can be simplified. In this case, one end of the coil spring is fixed to the operation shaft, and the other end of the coil spring is fixed to the first member.

  The angle adjusting mechanism of the present invention described above can also be used for applications other than angle adjustment (for example, height adjustment of various sheets) through a link mechanism or the like.

  As described above, the present invention is a structure having excellent strength, and each member constituting the structure can be made thin without being formed of a special hard metal, etc., and while maintaining its locking force, It is possible to provide an angle adjusting mechanism that can secure the strength of the member and can be easily reduced in weight, reduced in size, and reduced in cost. Therefore, each member can be processed by a general non-special press process, and the manufacturing cost of the angle adjusting mechanism can be reduced. It is also possible to provide a seat reclining device that employs this angle adjustment mechanism.

It is the perspective view which showed the state which decomposed | disassembled the angle adjustment mechanism of this invention into each member. It is the side view which showed the state which looked at the angle adjustment mechanism of this invention from the side. It is sectional drawing which showed the PP cross section (FIG. 2) in the angle adjustment mechanism of this invention. It is sectional drawing which showed the QQ cross section (FIG. 2) in the angle adjustment mechanism (locking state) of this invention. It is sectional drawing which showed the QQ cross section (FIG. 2) in the angle adjustment mechanism (lock release state) of this invention. It is explanatory drawing which shows a mode that the angle adjustment mechanism of this invention is switched from a locked state to a lock release state.

[Outline of Angle Adjustment Mechanism of the Present Invention]
A preferred embodiment of the angle adjustment mechanism of the present invention will be described more specifically with reference to the drawings. FIG. 1 is a perspective view showing a state in which the angle adjusting mechanism of the present invention is disassembled into each member. FIG. 2 is a side view showing the angle adjusting mechanism of the present invention as viewed from the side. FIG. 3 is a cross-sectional view showing a PP cross section (FIG. 2) in the angle adjusting mechanism of the present invention. FIG. 4 is a cross-sectional view showing a QQ cross section (FIG. 2) in the angle adjusting mechanism (locked state) of the present invention. FIG. 5 is a cross-sectional view showing a QQ cross section (FIG. 2) in the angle adjusting mechanism (unlocked state) of the present invention. FIG. 6 is an explanatory diagram showing a state where the angle adjustment mechanism of the present invention is switched from the locked state to the unlocked state. FIG. 6A shows a state in which the second plate and the first plate are in a locked state, and FIG. 6B shows that the cam plate is rotated from the state shown in FIG. When the one cam and the second cam are in contact with each other, FIG. 6C shows a state in which the cam plate is rotated from the state shown in FIG. The state before the lock | rock which rotated the 2nd member to the predetermined position from the state shown in FIG.6 (C) is shown.

  In the following, the case where the angle adjusting mechanism of the present invention is employed in a vehicle seat reclining device will be described as an example, but the application of the angle adjusting mechanism of the present invention is not limited thereto. In the angle adjustment mechanism of this embodiment, the second member 100 is a seat back frame (angle adjustment target) of a vehicle seat, and the first member 200 is a seat bottom frame of the vehicle seat.

  As shown in FIG. 1, the angle adjustment mechanism of the present embodiment is interposed between the second member 100 and the first member 200 and adjusts the inclination angle of the second member 100 with respect to the first member 200 in multiple stages. Make it possible. The angle adjusting mechanism includes a second Kikuza plate 10, a first Kikuza plate 20, a cam plate 40, a case 50, a second member mounting bracket 60, an automatic locking biasing means 70, and an operation. And means 30. Each of these members is arranged on the center line L, and the members excluding the first member 100, the first star plate 20 and the case 50 have a structure that can rotate around the center line L.

[Second Chrysanthemum Plate]
The second Kikuza plate 10 is a disk formed with a predetermined pitch over the entire circumference of the peripheral edge of the surface α ₂ where the plurality of meshing teeth A protruding toward the second member 100 face the second member 100 side. It has become. A fitting opening 13 for fitting a separation claw 43 provided on the surface γ ₂ of the cam plate 40 is provided at the center of the second Kikuza plate 10. Further, the fitting wall portion 11 for fitting a plurality of fitting convex portions 61 provided in a gear shape on the peripheral edge portion of the second member mounting bracket 60 on the surface α2 of the _second seat plate 10. Is provided. Further, a notch portion 12 for allowing a second cam convex portion 41 to be described later to pass therethrough is provided at the peripheral edge portion of the second Kikuza plate 10. The second Kikuza plate 10 is an ordinary steel plate material, and can be formed by performing a general pressing process. The plate thickness of the second Kikuza plate 10 can be made thinner than the member corresponding to the second Kikuza plate 10 in the conventional angle adjusting mechanism for the reasons already described. Specifically, the plate thickness of the second Kikuza plate 10 is normally 1.2 to 3.2 mm, and is 1.6 mm in the angle adjustment mechanism of the present embodiment. The diameter of the second Kikuza plate 10 is also not particularly limited, but if it is too small, it will be difficult to increase the locking force when it is locked, and if it is too large, it will be difficult to downsize the angle adjustment mechanism. For this reason, the diameter of the second Kikuza plate 10 is normally 60 to 90 mm, and is set to 80 mm in the angle adjustment mechanism of this embodiment.

[First Chrysanthemum Plate]
The first Kiza seat plate 20 is a disk formed at a predetermined pitch over the entire circumference of the peripheral edge portion of the surface β ₁ in which the plurality of meshing teeth B protruding toward the first member 200 face the first member 200 side. It has become. A mounting opening for attaching and fixing the surface (second mounting seat) facing the second member 100 side of the second member mounting bracket 60 to the second member 100 at the central portion of the first member seat plate 20. 22 is provided. A second cam opening 21 for inserting and acting a first cam convex portion 41 to be described later is provided in a cutout shape at the peripheral edge of the first Kikuza plate 20. The second cam opening 21 is provided at a location corresponding to the second cam protrusion 41. Since the material, processing method, plate thickness, diameter, and the like of the first Kikuza plate 20 are the same as those of the second Kikuza plate 10 described above, the description thereof is omitted.

[Case]
The case 50 is fixed by welding (not shown) so that the surface δ ₁ (first mounting seat) side cannot be rotated with respect to the first member 200. A through hole for inserting an operation shaft 32 of the operation means 30 to be described later is provided at the center of the case 50. A sleeve portion that protrudes toward the second member 100 is formed on the periphery of the case 50. As shown in FIGS. 3 to 5, first sleeve plate 20 is integrally fixed to the end edge of this sleeve portion by caulking or the like so that it cannot rotate with respect to case 50. Form. Main components such as the cam plate 40, the second star plate 10, the first star plate 20, and the second member mounting bracket 60 are accommodated in the hollow combined body. Among these, the cam plate 40, the second seat plate 10, and the second member mounting bracket 60 are rotatable about the center line L with respect to the case 50.

On the surface δ ₂ side of the case 50, a plurality of first cam convex portions 51 are provided on the radiation to be inserted into and act on a first cam opening 42 of the cam plate 40 described later. The first cam protrusion 51 is preferably provided as close to the peripheral edge of the case 50 as possible. This not only prevents the cam plate 40 from wobbling with respect to the case 50 but also allows it to approach the meshing teeth. The first cam convex portions 51 are usually provided in a number of 3 to 8 in order to secure the total area of the receiving surface 51a (FIG. 6) for receiving the second Kikuza plate 10 and exhibit the necessary strength. In the angle adjustment mechanism of this embodiment, six first cam convex portions 51 whose side end surfaces are inclined cam surfaces are provided. As shown in FIGS. 6B to 6D, the first cam convex portion 51 is guided inside the first cam opening portion 42 provided in the cam plate 40, and the first cam convex portion 51 is inclined. The cam plate 40 is slid in the center line L direction by the cam surface.

[Cam plate]
As shown in FIG. 1, the cam plate 40 is formed in a disk shape, and a through hole that fits into the square end of the operation shaft 32 is provided in the center. A separation claw 43 is provided on the side of the through hole. The separation claw 43 holds the second Kikuza plate 10 when the cam plate 40 moves to the side away from the first Kikuza plate 20, and is integrated with the second Kikuza plate 10 in the axial direction ( It has a function of sliding in the direction of the center line L). However, the second claw plate 10 can rotate independently from the cam plate 40 because the separation claw 43 does not restrict the rotation. A plurality of first cam openings 42 are provided in a circular arc shape at locations corresponding to the first cam convex portions 51 in the vicinity of the peripheral edge portion of the cam plate 40. Further, in a peripheral edge portion of the surface gamma ₂ side of the cam plate 40, a plurality of second cam protrusion 41 is provided on the radiation. For the same reason as the first cam convex portion 51, the second cam convex portion 41 is preferably provided at a location close to the peripheral edge portion of the cam plate 40. Usually, 3 to 6 second cam convex portions 41 are provided. In the angle adjustment mechanism of this embodiment, three second cam convex portions 41 whose side end surfaces are inclined cam surfaces are provided. As shown in FIG. 6, each second cam convex portion 41 is guided inside the second cam opening portion 21 provided in the first seat plate 20, and is inclined by the inclined cam surface of each second cam convex portion 41. The second Kikuza plate 10 is slid downward in the figure.

[Bracket for second member mounting]
As shown in FIG. 1, the second member mounting bracket 60 has a plurality of trapezoidal fitting convex portions 61 protruding outward from its outer peripheral portion, and repeatedly formed over the entire peripheral portion of the outer peripheral portion. It is a gear-shaped disk. The first member 200 side of the second member mounting bracket 60 is fitted to the fitting wall portion 11 of the second star seat plate 10. The second seat plate 10 can slide in the direction of the center line L with respect to the second member mounting bracket 60. Even if the thickness of the fitting convex part 61 and the height of the fitting wall part 11 are moved to the limit position on the first member 200 side (even when the lock is released), the fitting wall part 11 is fitted. The height of the engaging teeth is set to be sufficiently higher than the height of the meshing teeth so as to maintain the state where the convex portion 61 is fitted to the fitting wall portion 11 (the second member mounting bracket 60 does not come out of the fitting wall portion 11). Yes. That is, the second Kikuza plate 10 has a structure that cannot rotate relative to the second member mounting bracket 60. On the other hand, the surface (second mounting seat) on the second member 100 side of the second member mounting bracket 60 is fixed in a state in which it cannot rotate with respect to the second member 100 by welding or the like not shown. For this reason, the second member 100 is configured to rotate integrally with the second seat plate 10 and the second member mounting bracket 60.

  The number of fitting convex portions 61 is preferably as large as possible. Accordingly, the total contact area is ensured so that the applied force is dispersed and deformation does not occur even for a large torque applied to the second member 100 (seat back) in the locked state. In the angle adjustment mechanism of this embodiment, the number of fitting protrusions 61 is twelve.

[Operation means]
The operation means 30 includes an operation lever (not shown) for applying an operation force load and an operation shaft 32 fixed to the operation lever. One end of the operation shaft 32 (the end opposite to the operation lever) is connected to the cam plate 40 by a cam plate slide portion 33 provided at the one end. The cross-sectional shape of the cam plate slide portion 33 is a quadrangle, and is freely engaged with a square cam hole provided at the center of the cam plate 40. When the operation shaft 32 rotates, the cam plate 40 also rotates. It has become. When used in a seat reclining device like the angle adjustment mechanism of this embodiment, the operation lever is usually fixed to the outside of the first member 200 serving as a seat bottom frame. When the operation lever is operated, the operation shaft 32 rotates and the cam plate 40 rotates about the center line L. As shown in FIG. 3, an automatic locking urging means 70 made of a coil spring (torsion spring) is fitted on the end of the operation shaft 32 on the second member 100 side. The automatic locking urging means 70 returns the operating lever 31 to the initial position when the operating force is no longer applied to the operating lever 31, and The operation shaft 32 is urged so as to be automatically locked.

[Operation of angle adjustment mechanism]
Next, the operation of the angle adjustment mechanism of this embodiment will be described. As shown in FIG. 6A, the cam plate 40 slides upward and is pressed against the second member 100 side by the first cam convex portion 51 of the case 50, so that the second star plate 10 and the first chrysanthemum plate 10 are pressed. In the state where the seat plate 20 is in contact, the meshing tooth A and the meshing tooth B mesh with each other, and the locked state in which the second seat plate 10 and the first seat plate 20 cannot rotate relatively. (FIGS. 3 and 4). The operation lever 31 of the operation means 30 is in an initial position (usually a lying position where the tip of the operation lever 31 faces forward).

  When the operating lever 31 of the operating means 30 is operated in the unlocking direction (usually the standing direction in which the tip of the operating lever 31 faces upward) from the locked state shown in FIG. 6A, as shown in FIG. 6B. When the cam plate 40 rotates, the second cam projection 41 and the second cam opening 21 of the first seat plate 20 act, and the second seat plate 10 moves the separation pawl 43 (see FIGS. 4 and 5). The first member 200 is slid along the inclined cam surface together with the cam plate 40 while being separated from the first seat plate 20 by reference. At this time, the first cam and the second cam act simultaneously, and have a structure that does not inhibit the mutual action.

  When the operation lever 31 is further operated in the unlocking direction and the cam plate 40 is slid toward the first member 200, the second cam convex portion 41 is formed on the first seat plate 20 as shown in FIG. After that, the adjusting mechanism is unlocked by disengagement between the meshing tooth A of the second seat plate 10 and the meshing tooth B of the first seat plate 20, and the second member 100 and the first member 200. Will be free. When the second member 100 is rotated from this state, as shown in FIG. 6 (D), the second member 100 and the second star seat plate 10 can rotate together to adjust the angle.

  When the angle adjustment of the second member 100 is finished, the hand is released from the operation lever 31 of the operation means 30. As described above, in the angle adjustment mechanism of this embodiment, the automatic locking urging means 70 (see FIG. 3) is provided, so that when the operation lever 31 is no longer loaded with the operation force, the operation lever 31 is provided. Is automatically returned to its initial position. Accordingly, each member constituting the angle adjusting mechanism is changed from the state shown in FIG. 6C to the state shown in FIG. 6A while following the reverse process described above, and the state shown in FIG. Return to. However, in this case, the relationship between the second cam projection 41 and the second cam opening 21 and the relationship between the first cam projection 51 and the first cam opening 42 is reversed. When the state shown in FIG. 6 (A) is restored, the meshing tooth A of the second seat plate 10 and the meshing tooth B of the first seat portion rate 20 are in a locked state, and again the first member. The second member 100 cannot be rotated with respect to 200.

  By adopting the above lock structure, the distance between the second mounting seat (the surface on the second member 100 side of the second member mounting bracket 60) and the first mounting seat (the surface on the first member 200 side of the case 50). Can be kept thinner and constant, and can be easily locked and unlocked even within a limited thickness, which is suitable for miniaturization and weight reduction.

DESCRIPTION OF SYMBOLS 10 2nd seat plate 11 Fitting wall part 12 Notch part 13 Opening part 20 1st seat plate 21 2nd cam opening part 22 Opening part 30 Operating means 32 Operating shaft 33 Cam plate slide part 40 Cam plate 41 Second cam Convex part 41b Second cam action start point 41c Second cam action end point 42 First cam opening part 43 Separating claw 50 Case 51 First cam convex part 51a Receiving surface 51b First cam action start point 51c First cam action end Point 60 Second member mounting bracket 61 Fitting convex portion 70 Automatic locking urging means 100 Seat back frame (second member)
200 Seat bottom frame (first member)
A meshing tooth B meshing tooth

Claims (3)

This is a method of manufacturing an angle adjusting mechanism using a clutch mechanism that is connected to the second member and the first member, and is connected to and separated from each other by the meshing and separation of the second and second seat plates facing each other. And
A second face plate having a fitting wall portion on the surface facing the second member side, and having a meshing tooth A provided on a peripheral portion of the surface;
A first Kikuza that has a second cam opening at the periphery, a mounting opening at the center, and a meshing tooth B at a location facing the meshing tooth A on the surface facing the first member. Plates,
A plurality of fitting protrusions provided on the peripheral edge are combined with the second wall plate by being fitted to the fitting wall, and the surface facing the second member becomes the second mounting seat. A second member mounting bracket that is attached to the second member through the mounting opening of the monolith plate,
A cam plate that has a second cam convex portion and a first cam opening at the peripheral portion, a separation claw that acts on the second star seat plate, and moves the second star seat plate in the axial direction;
An operating shaft connected to the center of the cam plate;
A case having a first cam convex portion at the peripheral portion and a surface facing the first member side serving as a first mounting seat and attached to the first member;
Consists of
A hollow joined body was formed by fixing the case with the first member plate covering the opening end of the case on the second member side, and the distance between the second mounting seat and the first mounting seat was kept constant. And house the main components inside the case,
When the operating shaft is rotated and the cam plate rotates, the second cam convex portion acts on the second cam opening portion, and at the same time, the first cam convex portion acts on the first cam opening portion, A method of manufacturing an angle adjusting mechanism , wherein the cam plate is moved in the axial direction to engage and disengage the meshing tooth A of the second seat plate and the meshing tooth B of the first seat plate. An operation lever for rotating the operation shaft is provided on the operation shaft,
When the operating force is no longer applied to the operating lever, the operating lever is returned to the initial position, and the operating shaft or the operating lever is urged so that the second and second seats automatically engage with each other. The manufacturing method of the angle adjustment mechanism of Claim 1 which provided the biasing means. Method of manufacturing a seat reclining apparatus using the method according to claim 1 or 2, wherein the angle adjusting mechanism.

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