JP2003299544A - Reclining mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reclining mechanism which enables the miniaturization thereof. <P>SOLUTION: In a reclining apparatus which permits or prohibits the rotation of a ratchet 130 relatively to a base arm by getting an inner tooth 133 of the ratchet 130 made tiltable relatively to the base arm engaged with or disengaged from outer teeth 141 and 151 of poles 140 and 150, a plurality of toppings 501 and 503 and 505 and 507 formed along the circumference on the center of tilting as a center are formed through clearances T1 and T2. The circumferential width of the contact surface of a protrusion with the toppings is set larger than the circumferential width of the contact surface of each topping with the protrusion and the circumferential width of the clearance. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reclining mechanism for a vehicle, and more particularly to a reclining mechanism that is not locked when the tilt angle is such that locking by the reclining mechanism is unnecessary.

[0002]

2. Description of the Related Art A description will be given with reference to FIGS. Figure 1
0 is a front view of a conventional reclining mechanism, FIG. 11 is an enlarged sectional view taken along the line AA in FIG. 10, and FIG. 12 is FIG.
FIG. 6 is an enlarged cross-sectional view taken along the line BB in FIG.

In the figure, a hinge pin 4 to which an operation handle 2 is attached is rotatably engaged with a hole 3 formed in a base plate 1 on the seat cushion side.
A hole 9 into which the hinge pin 4 is inserted is formed in the ratchet 7 on the seat back side. Ratchet 7 has holes 9
Inner teeth 11 centered on the center are formed.

A step processing portion 1a for rotatably holding the ratchet 7 is formed on the outer edge portion of the base plate 1. Between the base plate 1 and the ratchet 7, there are provided three pawls 15 having outer teeth 13 that can mesh with the inner teeth 11 of the ratchet 7.

The base plate 1 is formed with two guide protrusions 1a which are formed so as to sandwich the pole 15 and guide the pole 15 in a direction orthogonal to the hinge pin 4. On the surface of the pole 15 facing the ratchet 7, there are two protrusions parallel to the hinge pin 4 and extending in the ratchet 7 direction, that is, the first protrusion 15a on the back side of the pole 15 and the first protrusion 15a on the outer tooth 13 side of the pole 15. Two protrusions 15b are formed.

On the hinge pin 4, the outer teeth 13 of each pole 15 are pushed by pushing the back of each pole 15 and the inner teeth 1 of the ratchet 7 are pushed.
A cam 17 that meshes with 1 is fixed. The inner end is locked to the base plate 1, and the outer end is cam 17
The urging force of the spring 19 locked to the cam 17
Is pushing the back of pole 15. By this biasing force,
The outer teeth 13 of the pole 15 are the inner teeth 11 of the ratchet 7.
Is urged in the direction of meshing with.

A release plate 21 is fixedly attached to the cam 17. This release plate 21 is a pole 1
5 is formed with a cam hole 21a with which the first projection 15a formed on the back side of the pole 5 engages, and by rotating against the biasing force of the spring 19, the outer tooth 13 of the pole 15 becomes the inner tooth of the ratchet 7. The pole 15 is moved in the direction away from 11.

The operation of the reclining mechanism having the above structure will be described. Normally, the cam 17 pushes the back portion of each pawl 15 by the urging force of the spring 19, the outer teeth 13 of each pawl 15 mesh with the inner teeth 11 of the ratchet 7 (lock state), and the ratchet (seatback) 7 Rotation is prohibited.

When the hinge pin 4 is rotated using the operation handle 2 against the biasing force of the spring 19, the cam 17 and the release plate 21 rotate. Then, the pressing of the cam 17 against the back of the pole 15 is released, and the pole 15 moves the cam hole 21 a of the release plate 21.
The outer teeth 13 of the pole 15 and the inner teeth 11 of the ratchet 7 are disengaged from each other (unlocked state), and the ratchet (seat back) 7 can be tilted.

Further, the movement of the cam 17 is transmitted to the cam 17 of the other reclining mechanism through the connecting pipe 23 fixed to the hinge pin 4. by the way,
As shown in FIG. 13, when the seat back 37 is the seat 33 having the walk-in mechanism, the reclining mechanism 3 is used.
5 is only required to lock / unlock the tilt of the seat back 37 with respect to the seat cushion 39 only within the reclining range of I to II. Then, between II and III, it is desirable that the seat back 37 can be tilted even if the operation force of the operation handle 2 is released.

Therefore, when the seat back 37 of the seat 33 shown in FIG. 13 is between II and III, the ratchet 7 of the reclining mechanism has an arc shape parallel to the internal teeth 11 and is opposite to the pole 15 (topping). Projection) 31
Are formed (see FIGS. 10 and 12). The topping 31 can contact the second protrusion 15b of the pawl 15, and the second protrusion 15b of the pawl 15 abuts the outer teeth 13 of the pawl 15 and the inner teeth 11 of the ratchet 7 to engage with each other. The pole 15 is held at the released position. Therefore, when the seat back 37 of the seat 33 shown in FIG. 13 is between II and III, the seat back 37 can be tilted even if the operation force of the operation handle 2 is released.

[0012]

However, in the reclining mechanism having the above structure, as shown in FIG. 12, the pole 15 is located at a position where the outer teeth 13 of the pole 15 and the inner teeth 11 of the ratchet 7 are disengaged. The topping 31 formed to hold the tongue has a shape elongated in the circumferential direction.

When the toppings 31 are formed by press working, if the toppings 31 are long in the circumferential direction, the pressing force of the press is dispersed, and a sag D is formed on the toppings 31 as shown in FIG. Therefore, topping 31 and pole 1
The clearance L with the second protrusion 15b of No. 5 becomes small.

Therefore, in order to obtain a sufficient allowance, the height of the second projection 15b of the pole 15 must be increased and the depth of the topping 31 must be increased, and the reclining mechanism must have a tilt center. There is a problem that it becomes large in the axial direction.

The present invention has been made in view of the above problems, and an object thereof is to provide a reclining mechanism that can be miniaturized.

[0016]

According to a first aspect of the present invention for solving the above-mentioned problems, a tilting center is provided on a base arm and a surface capable of tilting with respect to the base arm. A ratchet having internal teeth formed at the center, and provided between the base arm and the ratchet, external teeth capable of meshing with the internal teeth of the ratchet are formed, the surface facing the ratchet, the A pawl provided with a projection protruding in the ratchet direction is provided on the ratchet, and the projection of the pawl is capable of abutting, and the abutment of the projection causes the outer teeth of the pawl to mesh with the inner teeth of the ratchet. In a reclining mechanism having a topping for holding the pole at a position where is released, and a guide means for guiding the pole in a direction orthogonal to the tilt center. A plurality of toppings are formed along the circumference around the tilt center with a gap, and the circumferential width of the topping contact surface of the protrusion is defined as the protrusion contact surface of the topping. In the reclining mechanism, the width in the circumferential direction and the width of the gap in the circumferential direction are set to be larger.

When the outer teeth of the pole mesh with the inner teeth of the ratchet, tilting of the ratchet is prohibited. When the pawl is moved along the guide means to disengage the outer teeth of the pawl from the inner teeth of the ratchet, the ratchet can be tilted.

When the outer teeth of the pole mesh with the inner teeth of the ratchet, tilting of the ratchet is prohibited. When the pawl is moved along the guide means to disengage the outer teeth of the pawl from the inner teeth of the ratchet, the ratchet can be tilted.

Along the circumference centered on the tilt center,
By forming multiple toppings through the gap,
When the toppings are formed by the press molding method, the pressing force on the individual toppings can be locally increased. Therefore, the amount of sagging formed on the topping becomes small, and the topping, the protrusion of the pole, and the engagement margin increase.

Since the height of the projection of the pole can be made low and the depth of the topping can be made small by increasing the allowance between the topping and the projection of the pole, the topping can be made compact in the direction of the central axis of the tilt and miniaturized.

Further, the circumferential width of the topping contact surface of the projection is larger than the circumferential width of the projection contact surface of the topping and the circumferential width of the gap. By setting to, the projection of the pole always contacts the topping.

According to a second aspect of the present invention, the contact surface of the projection of the pole of the topping is a flat surface, and the surface of the pole that contacts the topping is a curved surface convex in the topping direction. The reclining mechanism according to claim 1.

By making the contact surface of the projection of the pole of the topping flat, and the surface of the pole contacting the topping a curved surface convex in the topping direction,
The topping and the pole projection are in line contact with each other, and the topping and the pole projection are less likely to be worn and the durability is improved.

Further, even if the projection of the pole is enlarged in the width direction, the position of the pole does not change when the projection of the pole is in contact with the topping, and the design change of the projection of the pole becomes easy.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings. The reclining mechanism of the present embodiment is a reclining mechanism provided in the double-sided reclining device. In addition, with the outer side reclining mechanism,
The inner side reclining mechanism has substantially the same configuration, and the difference is that the shape of the hinge pin and the operation lever is attached to the hinge pin of the outer side reclining mechanism. Therefore, the inner side reclining mechanism 90 will be described below.

In the reclining mechanism 90 of this embodiment,
The base arm 100 is attached as a lower arm to the frame 301 on the seat cushion side, and the ratchet 130 is attached to the back frame 302 on the seat back side (see FIGS. 3 to 5).

As shown in FIG. 3 to FIG. 6 and FIG. 9, a fitting hole 101 for rotatably supporting the hinge pin 120 is formed in the center of the base arm 100. Around the periphery, coaxial with the fitting hole 101,
Two support portions 102 and 103 having the same arcuate cross section and protruding toward the ratchet 130 are formed so as to face each other.

A fitting hole 131 at the center of the ratchet 130
(See FIG. 7 and FIG. 9)
03 is rotatably fitted, so that the ratchet 130 can be tilted with respect to the base arm 100. The outer peripheral portion of the base arm 100 and the outer peripheral portion of the ratchet 130 are joined by a mounting member 205 so as to be relatively rotatable. On the surface of the ratchet 130 facing the base arm 100, as shown in FIG. 7, a substantially circular recess 132 centered on the tilt center (hinge pin 120) of the ratchet 130 is formed, and the inner peripheral surface of the recess is entirely covered. Inner teeth 133 are engraved over the circumference.

Ratchet 13 on the base arm 100
The concave portion 104 (see FIG. 6) is also formed on the surface of the concave portion 0 facing the concave portion 132.
5, 106 are projected, and the ratchet 13 is provided at the bottom of the bottom.
Guide protrusions 107 and 108 that are guide means toward 0
Is projected.

The pole 140 is particularly shown in FIGS. 1, 6 and 9
As shown in FIG.
It is sandwiched between 05a and 106a, and is slidably guided in a direction orthogonal to the central axis of the tilt, so that the outer teeth 141 at the front end can mesh with the inner teeth 133 of the ratchet 130. Similarly for the pole 150, the guide protrusion 10
Sandwiched between the guide surfaces 107a, 108a of 7, 108,
The outer teeth 151 at the front end portion are slidably guided in a direction orthogonal to the central axis of the tilt, and can be meshed with the inner teeth 133 of the ratchet 130.

Oval section 123 of hinge pin 120 in cross section
The oval hole 171 of the cam 170 is fitted in the. Therefore, the hinge pin 120 is movable in the axial direction, and the cam 170 is fitted to the hinge pin 120 in a state where the cam 170 cannot rotate relative to the hinge 170. The cam 170 has a circular arc-shaped cross-section supporting portion 102, 1
Arc-shaped oblong holes 172 and 173 into which 03 is loosely fitted are bored, and the cam 170 can rotate with respect to the base arm 100 within a certain range.

That is, the cam 170 has the hinge pin 12
0 and rotates with the pressing portions 174 and 175, so that the pressed portions 1 of the rear surfaces 142 and 152 of the poles 140 and 150 are pressed.
The outer teeth 141 and 151 of the pawls 140 and 150 are engaged with the inner teeth 133 of the ratchet 130 by pushing the outer teeth 141 and 151 of the teeth 42a and 152a.

In addition to the pressing portion 174 of the cam 170 and the pressed portion 142a of the rear surface 142 of the pole 140, the cam 170 and the pawl 140 have a pressing portion 174 of the cam 170 when the pawl 140 is tilted. The abutment portion 174a formed on one side is attached to the abutment portion 142b of the pole 140.
However, the contact portion 142c of the pole 140 can contact the contact portion 174b formed on the other side of the pressing portion 174 of the cam 170.

Similarly, the cam 170 and the pole 150 have a pressing portion 175 of the cam 170 and a rear surface 1 of the pole 150.
In addition to the pressed portion 152a of 52, when the pole 150 is tilted, the contact portion 175a formed on one side of the pressing portion 175 of the cam 170 is attached to the contact portion 152 of the pole 150.
b is an abutting portion 175b formed on the other side of the pressing portion 175 of the cam 170, and an abutting portion 152c of the pole 150
Can contact.

The cam 170 is formed with projections 176 and 177 protruding toward the ratchet 130. The projections 176 and 177 are formed in the hole 18 of the release plate 180.
1, 182 are fitted. Therefore, the cam 170 and the release plate 180 rotate in conjunction with each other.

The release plate 180 has projections 1 extending in the ratchet 130 direction of the poles 140, 150 on the release plate 180.
Long hole-shaped cam holes 183, 184 through which 43, 153 are inserted
The shape of the cam holes 183, 184 is such that, when the operation lever is rotated in the unlocking direction, the cam surfaces of the cam holes 183, 184 press the projections 143, 153 to prevent the poles 140, 150 from moving. The outer teeth 141 and 151 at the front end are retracted to the back side and the inner teeth 13 of the ratchet 130 are
It is formed so as to be separated from 3.

The spiral springs 191 and 195 are
The inner end is hooked on the hooks 111, 112 of the base arm 100, the outer end is hooked on the stepped portions 178, 179 of the cam 170, and the cam 170 is rotated so that the cam 170 pushes the back surface of the poles 140, 150. It is one that urges.

The hinge pin 120 has an oval-shaped section 1
A small-diameter portion 124 is formed continuously with 23. A connecting pipe connected to the hinge pin of the reclining mechanism on the inner side is connected to the small diameter portion 124.

In the present embodiment, the ratchet 130 has cam holes 183 in the release plate 180.
The protrusions 143 of the poles 140 and 150 having the 184 inserted therethrough.
153 is abuttable, and the projections 143, 153 abut to hold the pawls 140, 150 at positions where the outer teeth 141, 151 of the pawls 140, 150 and the inner teeth 133 of the ratchet 130 are disengaged. (Protrusions) 501, 503, 505, 507 are formed.

In this embodiment, a topping for the pole 140 and a topping for the pole 150 are provided. The toppings for the pole 140 are the toppings 501 provided along the circumference centered on the tilting center (the hinge pin 120) via the gap T1, and the toppings 50.
It consists of 3. The toppings for the pole 150 are
The toppings 507 and toppings 507 are provided along the circumference centered on the tilt center (hinge pin 120) with a gap T2. Further, the poles 140 project toward the ratchet 130, and the toppings 501,
A protrusion 611 that can contact the topping 503 is formed. A protrusion 613 that protrudes in the ratchet 130 direction and that can contact the topping 505 and topping 507 is formed on the pole 140.
1. The contact surface of the topping 503 with the projection 611 of the pole 140 is a flat surface. Similarly, topping 50
5. The contact surface of the projection 613 of the pole 150 of the topping 507 is a flat surface.

The surface of the projection 611 of the pole 140 that contacts the toppings 501 and 503 is a curved surface that is convex in the directions of the toppings 501 and 503. Similarly, the surfaces of the protrusions 613 of the pole 150 that contact the toppings 505 and 507 are the toppings 505 and 5
The curved surface is convex in the 07 direction.

Further, the circumferential width of the abutment surface of the topping 501 and the topping 503 of the projection 611 of the pole 140 is the circumferential width of the abutment surface of the topping 501 and the projection 611 of the topping 503. And the gap T
The width was set to be larger than the width in the circumferential direction of 1. Similarly, the circumferential width of the contact surface with which the toppings 505 and toppings 507 of the projection 613 of the pole 150 abut is the circumferential width and gap of the contact surface with which the projections 613 of the topping 505 and topping 507 abut. It was set to be larger than the width of T2 in the circumferential direction.

The operation of the reclining mechanism 90 having the above structure will be described. Normally, the spiral spring 191,1
Due to the biasing force of 95, the cam 170 moves the poles 140, 15
Press the back of 0, the outer teeth 141 of the poles 140, 150,
151 meshes with the internal teeth 133 of the ratchet 130, and the ratchet (seatback) 130 is prohibited from rotating (locked state).

In FIGS. 1 and 2, the hinge pin 120 is resisted against the biasing force of the spiral springs 191 and 195.
Is rotated clockwise (arrow direction), the cams 170,
The release plate 180 rotates clockwise.

Then, the poles 140, 15 of the cam 170
0 is released from the rear surface, and the cam surfaces of the cam holes 183 and 184 of the release plate 180 are connected to the pole 1
40, 150 protrusions 143, 153 are pressed,
40 and 150 are retracted to the back side. Therefore, the pawls 140 and 150 are guided by the guide surfaces 105a to 108a of the guide protrusions 105 to 108 and move to the back side, and the outer teeth 141 and 151 of the pawls 140 and 150 mesh with the inner teeth 133 of the ratchet 130. Is released, and the ratchet (seat back) 130 can be tilted (unlocked state).

Inclining the seat back to a desired angle,
When the operating force on the operating lever is released, the cam 170 pushes the back surface of the poles 140, 150 by the biasing force of the spiral springs 191, 195, and the poles 140, 150
Outer teeth 141, 151 of the inner teeth 133 of the ratchet 130
, And the ratchet (seat back) 130 is returned to the state in which the rotation is prohibited.

The ratchet (seat back) 13
0 tilts, the toppings 501 and 503 are the poles 140, the toppings 505, and the toppings 5
When 07 is in a state of facing the pole 150, the operation force for rotating the hinge pin 120 (cam 170) is released against the biasing force of the spiral springs 191 and 195. Then, the urging force of the spiral springs 191 and 195 causes the poles 140 and 150 to move to the outer teeth 14 thereof.
1, 151 moves toward the direction in which they mesh with the internal teeth 133 of the ratchet 130, but the projection 611 of the pole 140 before the meshing with the topping 501 or the topping 503.
And the projection 613 of the pole 150 touches the topping 50.
5 or the topping 507, and the poles 140, 1
50 is held at a position where the external teeth 141, 151 and the internal teeth 133 of the ratchet 130 are disengaged. Therefore, the ratchet (seatback) 130 can be tilted without rotating the hinge pin 120 (cam 170) against the biasing force of the spiral springs 191 and 195.

According to the above structure, the following effects can be obtained. (1) A plurality of toppings 501, 50 along the circumference around the hinge pin (tilt center) 120.
3, the topping 505 and the topping 507 were formed with a gap.

By forming a plurality of small toppings, it is possible to locally increase the pressing force applied to each topping when the topping is formed by the press molding method. Therefore,
The amount of sagging formed on the topping becomes smaller, and the margin between the topping 501 topping 503 and the projection 611 of the pole 140 becomes larger. Similarly, topping 505,
The topping 507, the protrusion 613 of the pole 150, and the engagement margin increase.

The height of the protrusion 611 of the pole 140 and the protrusion 613 of the pole 150 is reduced by increasing the allowance between the topping and the protrusion of the pole, and the topping 50 is reduced.
Since the depths of the 1, topping 503, topping 505, and topping 507 can be reduced, the hinge pin (tilt central axis) 120 can be made compact and can be made compact. (2) Topping 501 of the protrusion 611 of the pole 140,
The circumferential width of the contact surface with which the topping 503 contacts is
The width is set to be larger than the circumferential width of the contact surface with which the projections 611 of the toppings 501 and 503 abut, and the circumferential width of the gap T1. Similarly, Paul 15
Topping 505 and topping 507 of the protrusion 613 of 0
The circumferential width of the contact surface with which the
5, it is set to be larger than the circumferential width of the contact surface with which the projection 613 of the topping 507 abuts and the circumferential width of the gap T2.

Therefore, the projection 611 of the pole 140 always contacts the topping 501 or the topping 503, and the projection 613 of the pole 150 always contacts the topping 505 or the topping 507. (3) Topping 501, pole 1 of topping 503
The contact surface of 40 with the projection 611 is a flat surface. Similarly, pole 1 of topping 505 and topping 507
The contact surface of the 50 with the projection 613 is a flat surface.

The surface of the projection 611 of the pole 140 that contacts the toppings 501 and 503 is a curved surface that is convex toward the toppings 501 and 503. Similarly, the surfaces of the protrusions 613 of the pole 150 that contact the toppings 505 and 507 are the toppings 505 and 5
The curved surface is convex in the 07 direction.

Therefore, topping 501 and topping 5
03 and the protrusion 611 of the pole 140, and the toppings 505 and 507 and the protrusion 613 of the pole 150 are line contacts. Therefore, the topping 501, the topping 503, the topping 505, the topping 507, the protrusion 611 of the pole 140, and the protrusion 613 of the pole 150 are less likely to be worn, and the durability is improved. (4) Even if the protrusion 611 of the pole 140 and the protrusion 613 of the pole 150 are enlarged in the width direction, the topping 501,
The pole 1 with the projection 611 of the pole 140 in contact with the topping 503 and the projection 613 of the pole 150 in contact with the toppings 505 and 507.
The positions of the poles 40 and the poles 150 do not change, and it is easy to change the design of the protrusions 611 of the pole 140 and the protrusions 613 of the pole 150.

The present invention is not limited to the above embodiment. Seat cushion side frame 301
Alternatively, the ratchet 130 may be attached as a lower arm, and the base arm 100 may be attached to the back frame 302 on the seat back side. Also, Paul (1
40, 150) may be one or three or more, and the cam 170 is also biased by the spiral spring 191, 1
It is not limited to the method by 95.

Further, two toppings 501 and 50 are formed at the place where the toppings are formed with a gap T1.
3, and two toppings 505 through the gap T2,
The toppings 507 are formed, but the number is not limited to two. More than two toppings may be formed through the gap.

In addition, the tilt angle which does not require the lock by the reclining mechanism 90 is the projection 61 of the poles 140 and 150.
The number of toppings may be one when the topping contact surfaces of 1, 613 fit within the circumferential width.

[0057]

As described above, according to the first aspect of the invention, a plurality of toppings are formed with a gap along the circumference centered on the tilt center, so that the toppings are press-molded. When forming by the method, the pressing force to the individual toppings can be locally increased. Therefore, the amount of sagging formed on the topping becomes small, and the topping, the protrusion of the pole, and the engagement margin increase.

Since the height of the projection of the pole can be made low and the depth of the topping can be made shallow by increasing the allowance between the topping and the projection of the pole, it becomes compact in the tilting central axis direction and can be miniaturized.

Further, the circumferential width of the topping contact surface of the protrusion is set to be larger than the circumferential width of the projection contact surface of the topping and the circumferential width of the gap. By setting to, the projection of the pole always contacts the topping.

According to the second aspect of the present invention, the contact surface of the projection of the pole of the topping is a flat surface, and the surface of the pole that contacts the topping is a curved surface convex in the topping direction. The topping and the pole projection are in line contact with each other, and the topping and the pole projection are less likely to be worn and the durability is improved.

Further, even if the projection of the pole is enlarged in the width direction, the position of the pole does not change when the projection of the pole is in contact with the topping, and the design change of the projection of the pole becomes easy.

[Brief description of drawings]

FIG. 1 is a front view of an inner reclining mechanism according to an embodiment of the present invention with a base arm removed from FIG.

FIG. 2 is a front view showing the outer appearance of the inner reclining mechanism of the double-sided reclining device according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view taken along the line C-C in FIGS. 1 and 2.

FIG. 4 is a sectional view taken along the line D-D in FIGS. 1 and 2.

5 is a cross-sectional view taken along the section line EE in FIGS. 1 and 2. FIG.

FIG. 6 is the base arm of FIG.

FIG. 7 is the ratchet of FIG.

8 is the cam of FIG.

FIG. 9 is a schematic exploded perspective view of a main part of the inner reclining mechanism according to the embodiment of the present invention.

FIG. 10 is a front view of a conventional reclining mechanism.

11 is an enlarged cross-sectional view taken along the line AA in FIG.

FIG. 12 is an enlarged cross-sectional view taken along the line BB in FIG.

FIG. 13 is a diagram illustrating a reason for providing topping.

FIG. 14 is a diagram for explaining a margin between the topping and the protrusion of the pole.

[Explanation of symbols]

100 base arm 130 ratchet 133 internal teeth 140,150 poles 141, 151 external teeth 170 cam 180 Release plate 183,184 Cam holes 191,195 Spiral spring (biasing means) 501, 503, 505, 507 toppings 611, 613 protrusion

Claims (2)

[Claims] 1. A base arm, a ratchet provided so as to be tiltable with respect to the base arm, and having internal teeth formed around a tilt center on a surface facing the base arm, the base arm and the ratchet. It is provided between the ratchet and
Outer teeth that can be meshed with the inner teeth of the ratchet are formed, and a pole that has a protrusion that protrudes in the ratchet direction is formed on a surface facing the ratchet, and a protrusion that is provided on the ratchet and that the protrusion of the pole touches. Topping, which holds the pawl at a position where the outer teeth of the pawl and the inner teeth of the ratchet are disengaged by the abutment of the projection, and the pawl in a direction orthogonal to the tilt center. In a reclining mechanism having a guide means for guiding, a plurality of toppings are formed with a gap along a circumference centered on the tilt center, and the topping projection contact surface in the circumferential direction is formed. The recliner is characterized in that the width and the circumferential width of the gap are set to be narrower than the circumferential width of the topping contact surface of the protrusion. Mechanism. 2. The reclining device according to claim 1, wherein a contact surface of the projection of the pole of the topping is a flat surface, and a surface of the pole that contacts the topping is a curved surface convex in the topping direction. mechanism.