JP2000060670A - Reclining seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To optionally adjust the inclination of a seat back. SOLUTION: A seat back is connected in a rising/falling manner to the rear part of a seat cushion, and a fixed ring 11 and a rotating ring 12 are provided on the rising/falling center shaft. The fixed ring 11 is fixed to a seat cushion, and the rotating ring 12 is fixed to the seat back. A V-shape cam groove 21 deep at the circumferential center and gradually shallowed toward both ends is formed at the outer periphery of the fixed ring 11. A rolling element 23 is interposed between the cam groove 21 and a cylindrical surface 22 at the inner periphery of the rotating ring 12, and the seat back is locked in the inclination adjusted position by the frictional contact of the rolling element with a bottom face 21a of the cam groove 21 and the cylindrical surface 22. An operating member 51 provided coaxially with a retainer 24 is rotated to axially press the retainer by a cam face 53 so as to engage a positioning protruding part 42 provided at the retainer 24, with a positioning recessed part 41 formed at the fixed ring 11. This engagement holds the rolling element 23 in a neutral position contactless with the cylindrical surface 22 to adjust the inclination of the seat back. Frictional resistance imparting mechanism 70 for imparting frictional resistance to the rotating ring 12 is provided to prevent the play of the seat back.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reclining seat for vehicles such as automobiles.

[0002]

2. Description of the Related Art A seat bag is connected to a rear portion of a seat cushion so that the seat bag can be raised and lowered, and a spiral spring for biasing the seat bag in an upright direction and a lock mechanism for locking the seat back at an adjusted position where the seat back is raised and lowered. In the provided manual reclining seat for automobiles, as a lock mechanism, a sector gear attached to the seat back is usually used to engage and disengage the pawl provided at the end of the operation lever from the ratchet mechanism. Is used.

[0003]

In the reclining seat having the ratchet mechanism as the lock mechanism, the teeth of the sector gear are engaged with the pawls, so that the inclination angle of the seat back becomes stepwise, and the seat back can be set at an arbitrary angle. There is an inconvenience that it is impossible to lock at an angle and it is not possible to take an appropriate posture with less fatigue.

When adjusting the angle of the seat back,
The pawl may be incompletely disengaged from the sector gear. At this time, the pawl comes into contact with the teeth of the sector gear in a stepwise manner, which causes an inconvenient noise.

An object of the present invention is to provide a reclining seat capable of adjusting the inclination of a seat back at an arbitrary angle and smoothly adjusting the inclination without generating abnormal noise.

[0006]

In order to solve the above problems, in the present invention, a seat back is connected to a seat cushion so that the seat back can rise and fall, and the seat back is attached to the seat back in a direction in which the seat back stands up. In a reclining seat to which elasticity of an elastic member is applied, a clutch is provided on the undulating center axis of the seat back, and the clutch is a fixed wheel attached to the seat cushion side, and a rotating wheel attached to the seat back side, Locking means for locking the rotation of the rotary wheel with respect to the fixed wheel by frictional contact,
Unlocking means for unlocking the locking means,
It is composed of an operating means for operating the lock releasing means, and is provided with a frictional resistance imparting means for imparting frictional resistance to the rotary wheel.

Here, the fixed wheel may have a larger diameter or a smaller diameter than the rotating wheel.

With the above construction, when the lock releasing means is operated by the operating means to unlock the lock means, the elastic force of the elastic member causes the seat back to stand up, and the weight of the upper half of the body is placed on the seat back. The seat back tilts backwards when the pad is stolen, and the inclination of the seat back can be adjusted arbitrarily. Then, after the tilt adjustment, when the operation of the operating means is released and the weight is applied to the seat back, the lock mechanism operates and the seat back can be locked at the tilt adjustment position.

Further, by providing a frictional resistance applying means to the rotating wheel, rattling in the rotation direction of the lock mechanism,
That is, the friction in the rotational direction of the seat back can be absorbed by the frictional resistance imparting means. Therefore, rattling of the seat back can be prevented, and a high-grade reclining seat with excellent stability can be obtained.

If the clutches are provided on both sides of the connecting portion between the seat cushion and the seat back, it is possible to prevent the seat back from being twisted even if the load applied to the seat back is deviated. it can.

In the reclining seat having the above structure, as a locking means, a cam groove is formed on the peripheral surface of the fixed wheel facing the rotating wheel, with a deep central portion in the circumferential direction and gradually decreasing toward both ends in the circumferential direction. And a cylindrical surface is provided on the rotating wheel so as to face the fixed wheel, a rolling element is incorporated in the cam groove, and the rolling element is placed in the center position in the circumferential direction of the cam groove. A minute radial clearance is formed between the moving body and the cylindrical surface, and a retainer for holding the rolling element is incorporated between the fixed wheel and the rotating wheel, and between the retainer and the rotating wheel, A structure having a friction mechanism for transmitting the rotation to the cage can be adopted.

In the locking means as described above, when the rotating wheel tries to rotate relative to the fixed wheel, the rolling element makes frictional contact with the bottom surface of the cam groove and the cylindrical surface, and the contact causes both the forward and reverse directions of the rotating wheel. Is prevented from rotating.

Further, as the locking means, arcuate notches are formed on the small-diameter side peripheral surfaces of the peripheral surfaces facing each other inside and outside the fixed wheel and the rotary wheel, and are swingable in the circumferential direction around the notches. The center of the sprag, which is supported and makes frictional contact with the large diameter side peripheral surface when swinging, is supported by a cage incorporated between the fixed wheel and the rotary wheel, and between the cage and the rotary wheel, the rotary wheel A structure having a friction mechanism for transmitting the rotation to the cage can be adopted.

In the above locking means, when the rotary wheel fixed to the seat back tries to rotate relative to the fixed wheel, the retainer rotating around the rotary wheel causes the sprags to tilt in the circumferential direction to cause frictional engagement with the cylindrical surface. For this purpose, the rotating wheels are locked and the seat back is held in the tilt adjustment position.

As unlocking means for unlocking the locking means as described above, a positioning recess is formed in one of the facing surfaces of the cage and the fixed ring, and the other is fitted in the positioning recess with a clearance in the rotational direction. A structure is provided in which a positioning projection is provided for positioning the cage with respect to the fixed ring so that the rolling element is located at the neutral position of the cam groove in the engaged state where the clearance in the rotation direction is eliminated. can do.

Further, as an operating means, an operating member having a lever is disposed coaxially with the retainer so as to be rotatably supported, and a retainer is provided between the operating member and the retainer by rotation of the operating member. It is possible to employ a structure in which a cam means for pressing the to engage the positioning projection with the positioning recess is provided.

In the lock releasing means and the operating means as described above, when the operating member is rotated to press the retainer by operating the lever, the positioning projection is engaged with the positioning recess. By the engagement, the cage is positioned, and the rolling elements and the sprags are held in the neutral position where a radial clearance is formed between them and the cylindrical surface. The back can be tilted.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the reclining seat has a seat cushion 1 and a seat back 2 standing upright from the rear end of the seat cushion 1.

As shown in FIG. 2, the seat cushion 1 has a frame 1a, and brackets 1b are attached to the rear ends of both sides of the frame 1a. On the other hand, the seat back 2 also has a frame 2a, and brackets 2b are provided at both lower ends of the frame 2a.

Bracket 1 in seat cushion 1
A connecting shaft 3 is attached to each of b, and one bracket 2b of the seat back 2 is rotatably connected to one connecting shaft 3.

A clutch 10 is provided on the other connecting shaft 3. As shown in FIGS. 3 to 6, the clutch 10
Has a fixed wheel 11 and a rotating wheel 12 provided outside thereof. The fixed wheel 11 is fixed to the bracket 1b of the seat cushion 1.

A bearing surface 13 having a small diameter is formed at the outer peripheral end of the fixed ring 11.

The rotary wheel 12 has an inward flange 12a at one end.
Is provided, and its flange 12a is rotatably supported by the bearing surface 13.

A connecting piece 12b is provided on the outer circumference of the rotary wheel 12.
Is formed, and the connecting piece 12b is connected to the bracket 2b of the seat back 2. Therefore, the seat back 2 is rotatably supported around the fixed ring 11, and can be undulated around the connecting shaft 3 that is provided coaxially with the fixed ring 11.

The rotating wheel 12 is locked by the lock mechanism 20 and prevented from rotating in the forward and reverse directions.

The lock mechanism 20 has a plurality of cam grooves 21 formed on the outer circumference of the fixed wheel 11, while a cylindrical surface 22 is provided on the inner circumference of the rotary wheel 12 so that the rollers assembled in the cam groove 21 can be used. The formed rolling element 23 is brought into frictional contact with the bottom surface 21a of the cam groove 21 and the cylindrical surface 22 to lock the rotary wheel 12.

Here, the cam groove 21 has a V-shape that is deep in the central portion in the circumferential direction and gradually becomes shallower toward both ends in the circumferential direction. The bottom surface 21a of the cam groove 21 is shown in FIG.
As shown in FIG. 7 (I), it may be composed of two inclined surfaces inclined in opposite directions, or FIG. 7 (II)
It may be arcuate as shown in FIG.

As shown in FIG. 8 (IIb), the rolling element 23
Is an outer diameter at which a minute radial clearance δ ₁ is formed between the cam groove 21 and the cylindrical surface 22 at a neutral position arranged in the circumferential center thereof. As shown in (IIIb) and FIG. 8 (IVb), the cylindrical surface 22 and the bottom surface 21a of the cam groove 21 are in frictional contact.

As shown in FIGS. 4 and 5, the rolling element 23
Is held by a cage 24 incorporated between the fixed wheel 11 and the rotary wheel 12. The cage 24 has the rolling element 2
A pocket 25 for housing 3 is formed. The pocket 25 has a width in which a minute radial clearance is formed between the pocket 25 and the rolling element 23 or a width in which a negative radial clearance is formed.

The cage 24 is guided by the outer diameter of the fixed ring 11, and a flange 26 axially opposed to the fixed ring 11 is provided on one side thereof. When the flange 26 moves in the direction in which the flange 26 approaches the fixed ring 11, the cage 24 rotates the rotary ring 1
The elastic member 27 incorporated in the inside of 2 is elastically deformed, and the elastic member 27 is configured to return the retainer 24 to the original position by the elastic force for restoring the shape.

Between the cage 24 and the rotary wheel 12, there is shown in FIG.
As shown in FIG. 6 and FIG.
4 is provided with a friction mechanism 30. The friction mechanism 30 includes an annular plate 31 at the other end of the cage 24.
Is fixed, a plurality of elastic pieces 32 are formed on the outer circumference of the annular plate 31, and the contact pieces 33 provided at the tips of the elastic pieces 32 are elastically brought into contact with the cylindrical surface 22 of the rotary wheel 12.

The lock mechanism 20 having the above structure is unlocked by the lock release mechanism 40, and the lock release mechanism 40 is operated by the operation mechanism 50.

The unlocking mechanism 40 is shown in FIGS.
As shown in (I), a V-shaped positioning recess 41 is formed at the open end of the fixed ring 11, while the flange 2 of the retainer 24 is formed.
Numeral 6 indicates a positioning projection 4 which fits into the positioning recess 41.
2 is provided, and the positioning protrusion 42 is moved in the axial direction of the cage 24 to engage the positioning recess 41 and position the cage 24 with respect to the fixed ring 11, as shown in FIG. 8 (IIa). By the positioning, the rolling element 23 is arranged at the neutral position located at the center of the cam groove 21 in the circumferential direction, as shown in FIG. 8 (IIb).

In the operating mechanism 50, as shown in FIGS. 5 and 6, a disc-shaped operating member 51 is rotatably attached to the tip of the connecting shaft 3, and a lever 52 is provided on the outer periphery of the operating member 51. When the operating member 51 is rotated by the operation of the lever 52, the cam surface 53 provided on one side of the operating member 51 presses the protrusion 54 provided on the surface of the flange 26 of the retainer 24 to rotate the retainer 24. I am trying to move in the direction.

Here, the lever 52 is, as shown in FIG. 1, a long hole 15 of the clutch cover 14 that covers the clutch 10.
And is movable along the elongated hole 15. Further, as shown in FIG. 3, the lever 52 is adapted to be rotated back by an elastic member 55 composed of a tension coil spring.

As shown in FIG. 5, a spiral spring 60 is incorporated in the fixed ring 11. The inner end of the spiral spring 60 is connected to the connecting shaft 3. Further, the outer end of the spiral spring 60 is hooked on the protruding shaft 61, and a mounting piece 62 provided at the end of the protruding shaft 61 is fixed to the connecting piece 12b of the rotary wheel 12,
An elastic force is applied to the seat back 2 in the upright direction by the spiral spring 60.

Here, the projecting shaft 61 is inserted into the arc-shaped elongated hole 63 formed in the operating member 51 so as not to hinder the rotation of the operating member 51.

A frictional resistance imparting mechanism 70 for imparting frictional resistance to the rotating wheel 12 is provided between the rotating wheel 12 and the bracket 2b of the seat cushion 2.

The frictional resistance imparting mechanism 70 is provided with an annular groove 71 on the flange 12a of the rotary wheel 12, and an elastic ring 72 attached to the annular groove 71 is elastically brought into contact with the bracket 1b to impart frictional resistance to the rotary wheel 12. Therefore, the friction resistance absorbs the rattling of the rotating wheel 12 in the rotating direction.

The reclining seat shown in the embodiment has the above-mentioned structure, and in FIG. 1, the lever 52 has the elastic member 5.
5 is pulled down by 5 to be in a neutral position. At this time, as shown in FIG. 8 (I), the lock release mechanism 40
A rotational clearance δ ₂ is formed between the positioning protrusion 42 and the positioning recess 41, and the retainer 24 can rotate with respect to the fixed ring 11 within the rotational clearance δ ₂ .

Further, due to the elastic force of the spiral spring 60, the seat back 2 is given a rotational force in a standing direction. Due to the rotational force, as shown in FIG. 8 (IVb),
The rolling element 23 of the lock mechanism 20 has a bottom surface 21 a of the cam groove 21.
The seat back 2 is locked without being rotated in the standing direction due to the frictional contact with the cylindrical surface 22.

When the weight of the upper half of the body is applied to the seat back 2 in the above-described state, the rotational force in the direction indicated by the arrow in FIG. 4 is applied to the rotary wheel 12. In addition, the rotating wheel 12
Since the friction mechanism 30 is provided between the holder 24 and the holder 24, a rotational force in the same direction is also applied to the holder 24.

At this time, as shown in FIG. 8 (IVb), since there is a slight play in the rotational direction between the cam groove 21 and the rolling element 23, the seat back 2 is within the play range.
As shown in FIG. 8 (IIIb), the rolling element 23 immediately comes into frictional contact with the bottom surface 21a of the cam groove 21 and the cylindrical surface 22 of the rotary wheel 12 to lock the seat back 2.

When the seat back 2 falls rearward within the play between the cam groove 21 and the rolling element 23, the rotary wheel 12 rotates in contact with the elastic ring 72 shown in FIG. The rattling in the rotational direction of the seat back 2 is absorbed by the elastic ring 72, and the driver does not feel the rattling of the seat back.

By applying silicon oil of 10 ⁵ cSt or more to the contact portion between the elastic ring 72 and the rotary wheel 12, the rotary wheel 12 moves smoothly, and rattling in the rotational direction of the seat back 2 is caused. It can be absorbed more effectively.

When adjusting the inclination of the seat back 2, the lever 52 shown in FIG. 1 is pulled up. By pulling up the lever 52, the cam surface 53 formed on the operation member 51
Presses the protrusion 54 of the retainer 24, so that the retainer 24
Moves in the axial direction, and the positioning protrusion 42 engages with the positioning recess 41 as shown in FIG. 8 (IIa). The retainer 24 is positioned on the fixed ring 11 by the engagement, and FIG.
As shown in (IIb), the rolling element 23 is held at the neutral position located at the center of the cam groove 21 in the circumferential direction, and the locking mechanism 2
0 is unlocked.

In the unlocked state, the rolling element 23
A radial clearance δ ₁ is formed between the seat back 2 and the cylindrical surface 22, so that the seat back 2 can tilt both in the upright direction and the inclining direction.
The seat back 2 is tilted backwards by leaning on the weight. Further, by separating the upper body from the seat back 2, the spring force of the spiral spring 60 causes the seat back 2 to move.
Thus, the inclination of the seat back 2 can be adjusted arbitrarily.

After adjusting the inclination of the seat back 2, the lever 52
When the elastic member 55 is returned to the neutral position by the elastic force of the elastic member 55, the elastic force of the elastic member 27 incorporated inside the rotary wheel 12 returns the retainer 24 toward the operating member 51, as shown in FIG. 8 (I). The positioning projection 42 of the lock release mechanism 40 separates from the positioning recess 41, and the rolling element 23 of the lock mechanism 20 is removed from the bottom surface 21a of the cam groove 21 as shown in FIG. 8 (IIIb) or 8 (IVb). The seat back 2 is locked in the tilt adjusting position by frictionally contacting each of the cylindrical surfaces 22.

As described above, since the seat back 2 can be locked at any tilt adjustment position, an appropriate posture with less fatigue can be secured, and the operability and safety of the steering wheel can be improved. You can

Further, since the lock mechanism is based on frictional contact, no abnormal noise is generated and no discomfort is given when adjusting the inclination of the seat back.

FIG. 9 shows another example of the clutch. In this example, the cage 24 is made of an elastically deformable material,
A lock release mechanism 40 is provided between the inner diameter surface of the cage 24 and the outer diameter surface of the fixed ring 11.

The lock release mechanism 40 has a positioning recess 43 formed on the outer diameter surface of the fixed ring 11 and a positioning protrusion 44 on the inner diameter surface of the cage 24.

A retainer 24 is attached to the outer diameter portion of the operating member 51.
Is provided with a cylindrical portion 57 that fits at the end of the retainer 24, and an operation cam surface 58 is formed on the inner diameter surface of the cylindrical portion 57, while the outer diameter surface of the cage 24 is pressed by the operation cam surface 58 in the radial direction. The protrusion 59 is provided.

Since the other construction is the same as that of the clutch 10 described above, the same parts are designated by the same reference numerals and the description thereof will be omitted.

In the above clutch 10, the lever 5
When the cylindrical portion 57 is rotated by pulling up 2, the protruding portion 5 provided on the outer diameter surface of the cage 24 by the operation cam surface 58.
By pressing 9 and elastically deforming the retainer 24 in the inner diameter direction, the positioning protrusion 44 is engaged with the positioning recess 43 to position the retainer 24, as shown in FIG. 10 (II).
The rolling element 23 is held at the neutral position of the cam groove 21.

FIG. 11 shows still another example of the clutch 10. In this example, the rolling element 23 of the clutch 10 shown in FIG.
And the cam groove 21 are omitted, and the sprag 80 is used instead.
Is provided. The sprag 80 has a substantially T-shaped side surface shape, and its base end is fitted into an arcuate notch 81 provided on the outer diameter surface of the fixed ring 11 and is swingably supported.

Further, the cage 24 is formed with pockets 82 for supporting the leg pieces of the sprags 80.

Since the other structure is the same as that of the clutch 10 shown in FIG. 5, the same parts are designated by the same reference numerals and the description thereof will be omitted.

The clutch is rotated as shown in FIG. 11 (III) by the rotation of the retainer 24 that rotates around when the rotating wheel 12 rotates.
Alternatively, as shown in (IV), the sprag 80 is tilted about the notch 81 to bring the sprag 80 into frictional contact with the cylindrical surface 22 of the rotary wheel 12, and the frictional contact causes the rotary wheel 1 to rotate.
I'm trying to lock 2.

12 and 13 show another embodiment of the present invention. In this embodiment, the clutch 10 is provided on both sides of the connecting portion between the seat cushion 1 and the seat back 2.
A clutch cover 14 for interior is provided.

As shown in FIG. 13, the connecting shaft 3 for supporting the clutch 10 has a tubular shape, and one end of the interlocking shaft 90 inserted into the connecting shaft 3 is connected to the operating member 51 of one clutch 10. The other end is connected to the operating member 51 of the other clutch 10 to interlock the pair of clutches 10,
The lever 52 is provided only on the operating member 51 of the one clutch 10.

Since the other structure of the clutch 10 is the same as that of the clutch 10 shown in FIG.

As described above, by providing the pair of clutches 10 on both sides of the connecting portion of the seat cushion 1 and the seat back 2 and linking both clutches 10, the stability of the support of the seat back 2 is increased. Even if a large load is applied to the seat back 2, the load can be sufficiently received and the seat back 2 can be prevented from being twisted.

[0065]

As described above, according to the present invention, since the seat back can be locked at any tilt adjustment position, a proper posture with less fatigue can be ensured, and the operability of the steering wheel can be improved. It is possible to improve safety.

Further, since the lock mechanism for locking the seat back is brought into frictional contact, there is no inconvenience that an abnormal noise is generated when the tilt of the seat back is adjusted, and no discomfort is given to the driver.

Further, by providing the frictional resistance imparting means for imparting frictional resistance to the rotating wheel, the rattling in the rotational direction of the locking means can be absorbed by the frictional resistance imparting means, so that the seat back It is possible to provide a reclining seat that prevents rattling and has a high-class feeling with excellent stability.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a reclining seat according to the present invention.

FIG. 2 is a perspective view showing a connecting portion of the above frame.

FIG. 3 is a front view of the above clutch.

FIG. 4 is a vertical sectional front view of the above clutch.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is an exploded perspective view showing a stationary ring, a cage and an operating member of the above.

7 (I) and (II) are cross-sectional views showing an example of a cam groove in the lock mechanism.

FIG. 8 (I) is a sectional view of the lock releasing mechanism of the clutch, and (II) to (IV) are views showing the relationship between the lock releasing mechanism and the lock mechanism.

FIG. 9 (I) is a partially cutaway front view showing another example of the same clutch, and (II) is a sectional view taken along line aa of (I).

10 (I) and (II) are sectional views showing the relationship between the lock mechanism and the lock release mechanism of the clutch.

FIG. 11 (I) is a partially cutaway front view showing still another example of the same clutch, and (II) to (IV) are diagrams showing an operating state.

FIG. 12 is a perspective view showing another embodiment of the reclining seat according to the present invention.

FIG. 13 is a cross-sectional view showing the interlocking relationship of the above clutch.

[Explanation of symbols]

1 Seat Cushion 2 Seat Back 10 Clutch 11 Fixed Wheel 12 Rotating Wheel 20 Lock Mechanism 21 Cam Groove 22 Cylindrical Surface 23 Rolling Element δ ₁ Radial Clearance 24 Cage 26 Flange 40 Lock Release Mechanism 41 Positioning Recess 42 Positioning Projection δ ₂ Rotation Directional clearance 43 Positioning recess 44 Positioning projection 50 Operating mechanism 51 Operating member 52 Lever 53 Cam surface 58 Operating cam surface 60 Spiral spring 70 Friction resistance applying mechanism 80 Sprag 81 Notch

Claims (8)

[Claims] 1. A reclining seat in which a seat back is connected to a seat cushion so that the seat back can rise and fall, and a resilient force of an elastic member is applied to the seat back in a direction in which the seat back stands upright. A clutch is provided on the clutch, and the clutch has a fixed wheel attached to the seat cushion side, a rotating wheel attached to the seat back side, and a locking means for locking the rotation of the rotating wheel with respect to the fixed wheel by frictional contact. A reclining seat, comprising: a lock releasing means for releasing the lock of the lock means, and an operating means for operating the lock releasing means, wherein a frictional resistance imparting means for imparting frictional resistance to the rotating wheel is provided. 2. The rotating means forms a cam groove on a peripheral surface of the fixed wheel facing the rotating wheel, the cam groove having a deep central portion in the peripheral direction and gradually becoming shallower toward both ends in the peripheral direction. Is provided with a cylindrical surface facing the fixed ring, a rolling element is incorporated in the cam groove, and the rolling element is disposed between the rolling element and the cylindrical surface at a neutral position where the rolling element is arranged at the center of the cam groove in the circumferential direction. A minute radial clearance is formed, and a cage that holds the rolling element between the fixed wheel and the rotating wheel is installed,
The friction mechanism for transmitting the rotation of the rotary wheel to the cage is provided between the cage and the rotary wheel.
Reclining seat described in. 3. The lock means forms arcuate notches on the small-diameter side peripheral surfaces of the peripheral surfaces facing each other inside and outside the fixed wheel and the rotary wheel, and is swingable in the circumferential direction around the notch. The center of the sprag, which is frictionally contacted with the large diameter side surface when swinging, is supported by a retainer incorporated between the fixed ring and the rotating ring, and the rotating ring is inserted between the retainer and the rotating ring. The reclining seat according to claim 1, wherein the reclining seat has a configuration in which a friction mechanism for transmitting the rotation of the roller to the cage is provided. 4. The lock releasing means forms a positioning recess on one of the facing surfaces of the cage and the fixed ring, and fits the positioning recess on the other with a clearance in the rotation direction, and the clearance in the rotation direction. The reclining seat according to claim 2 or 3, wherein a positioning protrusion is provided for positioning the retainer with respect to the fixed ring so that the rolling element is arranged at the neutral position of the cam groove in the engagement state in which there is no gap. 5. The cage according to claim 4, wherein the cage is provided with a flange axially opposed to the fixed ring, a positioning recess is formed on one of opposing surfaces of the flange and the fixed ring, and a positioning projection is provided on the other side. Reclining seat as described. 6. The cage according to claim 4, wherein the cage is made of an elastically deformable material, and a positioning recess is provided on one of the opposing circumferential surfaces of the cage and the fixed ring, and a positioning projection is formed on the other side.
Reclining seat described in. 7. The operating means rotatably supports an operating member having a lever so as to be coaxially opposed to the retainer and rotatably supported between the operating member and the retainer by rotation of the operating member. 7. A cam means for pressing the container to engage the positioning projection with the positioning recess is provided.
Reclining seat according to any one of. 8. The reclining seat according to claim 1, wherein the clutch is provided on both sides of a connecting portion between a seat cushion and a seat back, and both clutches are interlocked.