JP2019041963A - Reclining device - Google Patents

Abstract

To provide a reclining device stabilizing an attitude of a pole, when a pole is in an unlocked position, and stabilizing an engagement condition between an external tooth of the pole and an inner tooth of a first member, when the pole is moved to the lock position.SOLUTION: The reclining device includes: at least one second cam 44 that is provided between a cam 31 and a second pole 42 and pushes the second pole 42, when being pushed by the cam 31; and a second spring 51 that pushes the first pole 41 and the second pole 42 onto a pole guide projection 37.SELECTED DRAWING: Figure 2

Description

  The present invention has a cylindrical bottomed cylindrical first member in which internal teeth are formed along the circumferential direction on the inner cylindrical surface and one surface is an open surface, and an external tooth capable of meshing with the internal tooth. A plurality of poles, and a lock position provided on the open surface side of the first member so as to be relatively rotatable in the circumferential direction with the first member, the external teeth meshing with the internal teeth, the external A second member provided with a plurality of pole guides for guiding the pole between unlocking positions where the teeth are separated from the internal teeth, and provided rotatably between the first member and the second member A cam for moving the pole in the lock position direction, and at least one second cam provided between the cam and the pole and pushed by the cam to push the pole, The pole is guided between the two pole guides and the pole is in the locking position In this case, relative rotation between the first member and the second member is prohibited, and the second cam pushes the pole toward the lock position and reclines the pole into close contact with one of the pole guides. It relates to the device.

  As an example of a reclining device, an inner tooth is formed along the circumferential direction on an inner cylindrical surface, and a cylindrical first member with a bottom having an open surface on one side, and an external tooth capable of meshing with the internal tooth A plurality of poles having a plurality of poles, and a lock position provided on the open surface side of the first member so as to be relatively rotatable in the circumferential direction with the first member, the external teeth meshing with the internal teeth, A second member formed with a plurality of pole guides for guiding the pole between unlocked positions where the external teeth are separated from the internal teeth, and rotatable between the first member and the second member And at least one second cam provided between the cam and the pole and pushed by the cam to push the pole. The pole is guided between the two pole guides and When the pole is in the lock position, relative rotation between the first member and the second member is prohibited, and the second cam pushes the pole toward the lock position, and the pole is one pole There is one that is in close contact with the guide (see, for example, Patent Document 1).

JP, 2014-239721, A

  However, in the structure described in Patent Document 1, when the external teeth of the pole are not engaged with the internal teeth of the first member, that is, when the pole is in the unlocking position, the pole is It is supported. There is a gap between the pole and the pole guide for reasons such as smooth pole movement, pole and pole guide part accuracy.

Therefore, when the pole is in the unlock position, the posture of the pole is not stable, and when the pole is moved to the lock position by the cam and the second cam in that state, the outer teeth of the pole and the inner teeth of the first member There is a problem that the condition of meshing with is not stable.
The present invention has been made in view of the above problems, and an object thereof is to provide a reclining device in which the degree of meshing between the external teeth of the pole and the internal teeth of the first member is stable.

  In order to realize at least one of the above-mentioned problems, in the reclining device reflecting one aspect of the present invention, internal teeth are formed on the inner cylindrical surface along the circumferential direction, and one surface is an open surface. The first member is stacked on the open surface side of the first member, and a plurality of poles having a cylindrical first member with a bottom, an outer tooth capable of meshing with the inner tooth, and the first member and the circumferential direction. A plurality of pole guides are provided which are provided so as to be relatively rotatable, and which guide the pole between a locked position where the external teeth mesh with the internal teeth and an unlocked position where the external teeth are separated from the internal teeth A cam which is rotatably provided between the first member and the second member and which moves the pole in the direction of the lock position, and is provided between the cam and the pole; At least one second force pushing the pole And the pole is guided between the two pole guides, and when the pole is in the locked position, relative rotation between the first member and the second member is prohibited, and The second cam is a reclining device for pressing the pole in the lock position direction and bringing the pole into close contact with one of the pole guides, and a spring for pressing the pole in the second cam direction is provided.

  Other features of the present invention will become more apparent from the modes for carrying out the invention described below and the accompanying drawings.

  According to the reclining device of the present invention, when the pole is in the unlock position by providing the spring for pressing the pole in the second cam direction, the posture of the pole is stabilized and the pole is moved to the lock position The engagement between the external teeth of the pole and the internal teeth of the first member is stabilized.

  Other effects of the present invention will become more apparent from the modes for carrying out the invention described below and the attached drawings.

It is an exploded perspective view of a reclining device of this embodiment. It is the disassembled perspective view seen from the arrow II direction of FIG. It is a front view at the time of the lock seen from the arrow III direction in the state where the parts of the reclining device of FIG. 1 are assembled and the second member other than the pole guide is removed. In FIG. 3, it is a cutting part end view in the cutting line IV-IV in the state which assembled | attached the 2nd member. In FIG. 3, it is a cutting part end view in the cutting line V-V in the state which assembled | attached the 2nd member. In FIG. 3, it is a cutting part end view in the cutting line VI-VI in the state which assembled | attached the 2nd member. It is a figure explaining the case where the 1st pole of Drawing 1 and the 2nd pole are in a locked position. It is a figure explaining the case where the 1st pole of Drawing 1 and the 2nd pole are in an unlocking position. It is a block diagram of the seat provided with the reclining device of this embodiment.

Embodiments will be described using the drawings.
First, a seat provided with the reclining device of the present embodiment will be described using FIG. The seat 1 comprises a seat cushion 2 for supporting the buttocks of the seated person, and a seat back 3 provided so as to be tiltable in the front-rear direction with respect to the seat cushion 2 and for supporting the back of the seated person. A reclining device 4 is provided on the rotational shaft (O) of the tilting of the seat back 3 and permits / prohibits tilting of the seat back 3.

In addition, the reclining device 4 can be tilted from the front tilt state to the back tilt state.
And in the period from the first stage lock state to the backward fall state and in the forward fall state, tilting of the seat back 3 can be permitted / prohibited, but from the first stage lock state to the forward fall state, the unlocking holding mechanism (The details will be described later), the lock release holding state is established, and the seat cushion can be tilted without operating the operation lever.

The reclining device of the present embodiment is provided on the left and right of the seat, and the structure is the same. Therefore, the reclining device 4 on one side will be described below.
The reclining device 4 will be described with reference to FIGS. 1 to 8. 1 is an exploded perspective view of the reclining device according to this embodiment, FIG. 2 is an exploded perspective view seen from the direction of arrow II in FIG. 1, and FIG. 3 is a second member other than the pole guide 4 is a front view at the time of locking as viewed from the direction of arrow II, FIG. 4 is an end view of the cut portion along the cutting line IV-IV in the state where the second member is assembled in FIG. 6 is an end view of the cutting part along the cutting line V-V in the state where the second member is assembled, FIG. 6 is an end view of the cutting part along the cutting line VI-VI in the state where the second member is assembled in FIG. 7 is a view for explaining the case where the first pole and the second pole in FIG. 1 are in the lock position, and FIG. 8 is a view for explaining the case where the first pole and the second pole in FIG.

  The ratchet (first member) 21 provided on the seat back 3 side has a bottomed cylindrical shape in which a disk-like plate material is half-cut out by a press, and a circular recess 21 a is formed. On the inner peripheral surface of the circular recess 21a, internal teeth 23 are formed in the entire circumferential direction. Further, at the center of the circular recess 21a, there is formed a through hole 21b through which a shaft (not shown) disposed along the rotational axis (the axis O in FIGS. 1 and 2) of tilting of the seatback 3 is loosely inserted. It is done. The cross-sectional shape of the shaft (not shown) of the present embodiment is not circular.

  The base plate (second member) 25 provided on the side of the seat cushion 2 is also formed by half-blanking a disk-like plate like the ratchet 21 by a press, and a circular recess 25 a is formed. The diameter of the circular recess 25 a is set to be slightly larger than the outer diameter of the ratchet 21. Then, the ratchet 21 is fitted in the circular recess 25a, and the base plate 25 and the ratchet 21 can be relatively rotated. Further, at the center of the base plate 25, a through hole 25b is formed in which a shaft (not shown) is loosely inserted.

The outer peripheral portion of the ratchet 21 and the outer peripheral portion of the base plate 25 are sandwiched by the ring-shaped outer peripheral ring 27, and the ratchet 21 and the base plate 25 are relatively rotatable without being separated in the direction of the axis O of relative rotation. It is held.
The cam 31 is disposed in a space formed by the circular recess 21 a of the ratchet 21 and the circular recess 25 a of the base plate 25. At the center of the cam 31, a hole 31a in which a shaft (not shown) is fitted is formed. And the shaft and the cam 31 which are not shown in figure rotate integrally. Therefore, the shaft (not shown) serves as a transmission member for transmitting the movement of the cam 31 of one of the reclining devices provided on both sides of the seat to the cam of the other reclining device. Further, the cam 31 is formed with three projections 31 c that project in the ratchet 21 direction. Furthermore, on the outer peripheral portion of the cam 31, three first protrusions 31d and three second protrusions 31e are alternately formed along the circumferential direction. Furthermore, the cam 31 is formed with three holes 31 f in which three wire work springs 51 described later are engaged.

  A release plate (release cam) 33 is disposed between the cam 31 and the circular recess 21 a of the ratchet 21. The release plate 33 is formed with a hole 33 a with which the three projections 31 c of the cam 31 engage. The cam 31 and the release plate 33 rotate integrally as a result of the engagement between the projection 31c and the hole 33a. Further, a hole 33 e is formed at the center of the release plate 33.

  Between the release plate 33 and the circular recess 25 a of the base plate 25, three poles, ie, one first pole 41 and two second poles 42 along the circumferential direction centering on the axis O. It is arranged. In the present embodiment, the first pole 41 and the second pole 42 are arranged at a pitch of approximately 120 ° in the circumferential direction about the axis O.

On the surfaces of the first pole 41 and the second pole 42 facing the internal teeth 23, external teeth 41a and external teeth 42a capable of meshing with the internal teeth 23 are formed.
Furthermore, a second cam 44 is disposed between the second pole 42 and the cam 31.
On a surface opposite to the surface on which the external teeth 41 a of the first pole 41 are provided, a first contact portion 41 b which can be in contact with the first projection 31 d of the cam 31 and a second projection of the cam 31 A second abutted portion 41c to which the third arm 31e can abut is formed.

In addition, on the surface opposite to the surface on which the external teeth 42a of the second pole 42 are provided, there are a first contact portion 42b that can be in contact with the second cam 44, and a second projection 31e of the cam 31. A second contactable portion 42c capable of contact is formed.
The second cam 44 has a first contact portion 44d which can be in contact with the first projection 31d of the cam 31, and a guide contact portion 44a which can be in contact with a pole guide projection (pole guide) 37 described later. And a first contact portion 44 b that can be in contact with the first contact portion 42 b of the second pole 42.

  In the circular recess 25 a of the base plate 25, three pole guide protrusions 37 are formed at a pitch of 120 ° along the circumferential direction of the circle centered on the axis O of relative rotation. Furthermore, in the circular recess 25a between the pole guide projections 37, a guide groove 36 is formed having a substantially U-shaped guide portion extending in the radial direction of a circle centered on the axis O of relative rotation. There is.

  The two pole guide projections 37 adjacent to each other allow the first pole 41 and the second pole 42 to move only in the radial direction of a circle centered on the axis O of relative rotation. That is, in the pole guide projection 37, the external teeth 41a, the lock position where the external teeth 42a mesh with the internal teeth 23 of the ratchet 21, the external teeth 41a, the unlock position where the external teeth 42a are separated from the internal teeth 23 of the ratchet 21. The first pole 41 and the second pole 42 are guided between them.

  On the surface of the first pole 41 and the second pole 42 facing the release plate 33, a protrusion 41d and a protrusion 42d which protrude in the direction of the release plate 33 are formed. The release plate 33 is formed with a cam hole 33 b in which the projection 41 d of the first pole 41 and the projection 42 d of the second pole 42 engage. The cam hole 33b is formed with an inclined surface on which the projection 41d of the first pole 41 and the projection 42d of the second pole 42 abut, and the release plate 33 is in the direction opposite to the arrow T direction in FIGS. When it rotates, the first pole 41 is moved in the direction (unlocked position direction) in which the external teeth 41a of the first pole 41 and the external teeth 42a of the second pole 42 are separated from the internal teeth 23 of the ratchet 21 along the pole guide projection 37. , And the second pole 42 is moved.

Further, the first pole 41 is formed with two protrusions 41 h engageable with the guide portion of the guide groove 36 of the base plate 25. Further, the second pole 42 is formed with one protrusion 42 h engageable with the guide portion of the guide groove 36 of the base plate 25.
Between the release plate 33 and the circular recess 21 a of the ratchet 21, three wire work springs 51 curved in a substantially C shape are disposed.

Here, the lock release holding mechanism for holding the pole 41 of the present embodiment at the unlock position will be described.
As shown in FIG. 1, on the inner cylindrical surface of the bottom surface from the internal teeth 23 of the ratchet (first member) 21, an arc-shaped guide 61 is formed which protrudes toward the axis O of relative rotation and extends along the circumferential direction It is done. The guide 61 is composed of two types of arc-shaped protrusions having different amounts of protrusion toward the axis O of relative rotation. The first arc-shaped projection has three small diameter portions 61a whose center angle is the same as the angle of the lock release holding state of the reclining device. The second arc-shaped projection is, among these three small diameter portions 61a, three large diameter portions 61b whose radial projection amount is smaller than the small diameter portion 61a.

As shown in FIG. 2, the first pole 41 and the second pole 42 are formed with a protrusion 41 e and a protrusion 42 e that face the arc-shaped guide 61 (small diameter portion 61 a and large diameter portion 61 b) of the ratchet 21. ing.
The protrusion amount of the large diameter portion 61b is the first pole 41, with the first pole 41, the projection 41e of the second pole 42, and the projection 42e facing the large diameter portion 61b of the guide 61 of the ratchet 21. The external teeth 41 a of the second pole 42 and the external teeth 42 a are set to a projection amount capable of meshing with the internal teeth 23 of the ratchet 21. On the other hand, when the first pole 41, the projection 41e of the second pole 42, and the projection 42e abut on the small diameter portion 61a of the guide 61 of the ratchet 21, the first pole 41, the second pole The 42 external teeth 41 a and the external teeth 42 a are set to a projection amount that can not be engaged with the internal teeth 23 of the ratchet 21.

Therefore, in the present embodiment, the small diameter portion 61 a of the guide 61 of the ratchet (first member) 21
The first pole 41, the projection 41e of the second pole 42, and the projection 42e form an unlocking holding mechanism for holding the first pole 41 and the second pole 42 in the unlocking position.
The adjacent two pole guide projections (pole guides) 37 provided to sandwich the side portions of the first pole 41 and the second pole 42 respectively have one side of the first pole 41 and the second pole 42. And a second pole guide 37b facing the other side of the first pole 41, and a third pole guide 37e facing the other side of the second pole 42. ing.

The first pole guide 37a is formed with a recess 37f that forms a space between the first pole 41 and one side of the second pole 42.
The side opposite to the second pole guide 37b of the first pole 41 is composed of a base end side 41i on the cam 31 side and a tip side 41j on the external tooth 41a side via a step. And the width in the circumferential direction of the first pole 41 is set such that the side of the distal end side 41j is wider than the side of the proximal end 41i. Further, the proximal end side portion 41i and the distal end side portion 41j are parallel to each other.

  On the other hand, the second pole guide 37b has a proximal end side 37i opposed to the proximal end side 41i of the first pole 41 and a distal end side opposed to the distal end side 41j of the first pole 41 via the step. 37j are formed. The first pole guide 37a of the guide 37 and the second pole guide 37i (proximal side 37i and distal side 37j) are parallel to each other.

  Among the side portions of the second pole 42 facing the third pole guide 37e, as described above, the first contact portion 42b with which the first contact portion 44b of the second cam 44 contacts is formed on the cam 31 side. ing. Further, a tip end side portion 42k is formed on the external tooth 41a side via the first abutted portion 42b and the step portion. On the other hand, the third pole guide 37e has a proximal end side 37l (second cam guide) opposed to the guide contact portion 44a of the second cam 44 and a distal end side portion 42k of the second pole 42 via the step portion. And the opposite end side 37k.

  And in this example of a form, tip side part 37k and base end side 37l were made nonparallel. Specifically, as shown in FIG. 7 and FIG. 8, the tip side portion 37 k is formed in parallel with the moving direction of the second pole 42 to the unlocking position. In other words, it is parallel to the first pole guide 37a. On the other hand, the proximal end 371 (second cam guide) is inclined inward (toward the second cam 44) by θ from the moving direction of the second pole 42 to the unlock position (the direction in which the distal end 37k extends). ing. In other words, with respect to the movement of the second pole 42 to the unlock position, the width of the first pole guide 37a and the tip side portion 37k is inclined in the direction to reduce the width. That is, since it intersects with the unlocking direction of the second pole 42, movement of the second pole 42 in the unlocking direction can be further suppressed, and rattling in the locked state is less likely to occur. In addition, even if a load in the unlocking direction acts on the second pole 42, the locked state can be easily maintained.

A first end 51a bent toward the base plate 25 is formed on one end side of the three wire work springs 51, and a second end bent toward the base plate 25 is formed on the other end side. An end 51 b is formed.
Then, in the elastically deformed state, the first end 51a of the wire work spring 51 passes through the hole 33e of the release plate 33 and engages with the hole 31f formed in the cam 31, and the second end 51b is , In the recess 37 f of the pole guide projection 37.

  The elastic repulsion force of the wire work spring 51 causes the first end 51 a of the wire work spring 51 to press the inner wall surface of the hole 31 f of the cam 31 with a force F, and the cam 31 has a first projection 31 d and a second projection. The portion 31e corresponds to the first abutted portion 41b, the second abutted portion 41c of the first pole 41, the second abutted portion 42c of the second pole 42, and the first abutted portion of the second cam 44, respectively. It is biased in a direction (one direction) opposite to 44d.

  The second end 51 b inserted in the recess 37 f of the pole guide projection 37 presses one side of the first pole 41, and the proximal side 41 i of the other side of the first pole 41, the tip side The portion 41 j is pressed against the proximal side 37 i and the distal side 37 j of the pole guide projection 37. Further, the second end 51 b inserted in the recess 37 f of the pole guide projection 37 presses one side of the second pole 42, and the second cam 44 of the other side of the second pole 42 is interposed. Also, the distal side 42k is pressed against the proximal side 37l and the distal side 37k of the pole guide projection 37. That is, the wire-working spring 51 presses the first pole 41 in the direction of the other pole guide projection (the other pole guide) 37 and presses the second pole 42 in the direction of the second cam 44. In the present embodiment, the wire work spring 51 is always pressed in the direction of the other pole guide projection 37 or the second cam direction 44 even during movement from the locked state → to the unlocked state.

  Further, in the present embodiment, the second end 51 b of the wire work spring 51 is the first pole when the second end 51 b of the wire work spring 51 and the recess 37 f of the pole guide projection 37 are fitted (inserted). 41, one side of the second pole 42 is pressed and biased. A space (a gap) exists on the side opposite to the pressing surface of the second end 51 b of the wire work spring 51, and the second end 51 b of the wire work spring 51 has an urging force or more in a direction different from the urging force. When a force is applied, the second end 51 b is movable in the direction away from one side of the first pole 41 and the second pole 42.

  When the first pole 41 and the second pole 42 are in the lock position, the second cam 44 receiving the force F from the cam 31 resists the biasing force of the wire work spring 51 as shown in FIG. While pushing the second pole 42 in the locking position direction with the component force F 'of F, and abutting on the proximal end side 37l of the pole guide projection 37 with the component force F' 'of the force F, the second pole 42 is pole guide The first pole guide (one pole guide) 37a of the projection 37 is shaped so as to generate a wrinkled state.

Here, the operation of the above-described reclining device will be described.
Normally, the first pole 41 and the second pole 42 provided on the base plate 25 through the cam 31 by the elastic repulsive force of the wire work spring 51 have the external teeth 41 a and the external teeth 42 a, and the internal teeth 23 of the ratchet 21. The relative position between the ratchet (first member) 21 and the base plate (second member) 25 is prohibited, and the seat back is in a non-rotatable state (locked state) with respect to the seat cushion.

  When the cam 31 is operated in the other direction (opposite to the arrow T) against the biasing force of the wire work spring 51, the projection 31c of the cam 31 engages with the hole 33a of the release plate 33. From the relationship, the release plate 33 also rotates together. At this time, the pressure applied to the first contact portion 41 b of the first pole 41 and the first contact portion 44 d of the second cam 44 by the first projection 31 d of the cam 31 is released.

  Furthermore, when the release plate 33 is rotated, the first pole 41 and the second pole 42 (and the second cam 44) are exposed by the inclined surface of the cam hole 33b of the release plate 33 with which the projection 41d of the pole 41 engages. The teeth 41a, the external teeth 42a, and the internal teeth 23 of the ratchet 21 are moved to the unlocked position where the engagement with the internal teeth 23 is released, and relative rotation between the ratchet (first member) 21 and the base plate (second member) 25 becomes possible. The seat back is rotatable relative to the seat cushion.

  When the operating force on the cam 31 is released, the biasing force of the wire work spring 51 causes the cam 31 and the release plate 33 to return to their original positions, and the first projection 31 d of the cam 31 is the first subject of the first pole 41. The first contact portion 44d of the contact portion 41b and the second cam 44 is pressed, and the outer teeth 41a and the outer teeth 42a of the first pole 41 and the second pole 42 mesh with the inner teeth 23 of the ratchet 21, The relative rotation between the (first member) 21 and the base plate (second member) 25 is prohibited, and the locked state is established again.

  Further, in the present embodiment, the first protrusion 31 d of the cam 31 is adjacent to the surface pressing the first pole 41 and the second cam 44 in the locked state and protrudes in the radial direction from the pressing surface. When the second pole 42 is in the unlocking position, as shown in FIG. 8, protrusions 31 h are formed so as to be in contact with the inner diameter surface 37 g of the pole guide protrusion 37 so as to be abuttable. Further, when the first pole 41 and the second pole 42 are in the unlock position, the projection 31 h is different from the pole that faces the respective first projections 31 d (close to the projection 31 h) at the time of locking. The pole 41 and the second pole 42 are also arranged to be able to abut. Further, as shown in FIG. 7, in the locked state, the first pole 41 and the second cam 44 are respectively formed with a relief recess 41 k and a relief recess 44 h for preventing interference with the protrusion 31 h.

According to the present embodiment, the following effects can be obtained.
(1) By providing the wire work spring 51 for pressing the first pole 41 and the second pole 42 against one pole guide projection (pole guide) 37, the first pole 41 and the second pole 42 are in the unlocked position. In a certain state, the postures of the first pole 41 and the second pole 42 are stabilized, and the first pole 41 and the second pole 42 can be moved to the lock position as they are, so the external teeth 41 a of the first pole 41 and the second pole 42 The engagement between the external teeth 42a and the internal teeth 23 of the ratchet 21 is stabilized.

Further, by having the second cam 44, when the second pole 42 is moved to the lock position, rattling does not occur when the external teeth 42a of the second pole 42 and the internal teeth 23 of the ratchet 21 mesh.
(2) The presence of two second cams 44 allows the second pole 42 free of rattling due to a wedge state to be disposed at a different angle (in the circumferential direction), and the relative rotational direction of the base plate (second member) 25 at the time of locking Can be more effectively prevented.

(3) One end of the wirework spring 51 pushes the first pole 41 and the second pole 42 in the direction of one pole guide projection 37, and the other end of the wirework spring 51 is attached to the cam 31 to bias the cam 31 By doing this, the number of parts is reduced.
(4) The second end 51 b of the wire spring 51 is the first pole 41, and the second end 51 b of the wire spring 51 is engaged with (inserted) the second end 51 b of the wire spring 51 and the recess 37 f of the pole guide projection 37. One side of the pole 42 is biased. A space (a gap) exists on the side opposite to the pressing surface of the second end 51 b of the wire work spring 51, and the second end 51 b of the wire work spring 51 has an urging force or more in a direction different from the urging force. When a force is applied, the second end 51 b is movable in the direction away from one side of the first pole 41 and the second pole 42. Therefore, even if a load is applied from the first pole 41 and the second pole 42 in the direction of one end of the wirework spring 51, one end of the wirework spring 51 is not affected.

The present invention is not limited to the above embodiment.
For example, although the above embodiment is described with three poles, two poles are also possible. In this case, it is preferable that the poles be provided diagonally and that there be two second cams.
When there are four or more poles, it is preferable that there be at least two second cams. At that time, it is preferable to arrange the poles having the second cam as diagonally as possible.

Furthermore, in the above embodiment, a spring (first spring) biasing the cam 31 and a spring (second spring) pressing the first pole 41 and the second pole 42 against one pole guide projection (pole guide) 37 Are the same wire work springs 51, but different springs may be provided.
Further, although the tip end side 37k for guiding the second pole 42 and the base end side 371 (second cam guide) for guiding the second cam 44 are formed in the same member (pole guide projection 37), separate members It may be formed in

  Furthermore, in the above embodiment, the first end 51a of the wire work spring 51 engages with the cam 31 and biases the cam 31, but engages with the release plate 33 that rotates integrally with the cam 31. May be

21 Ratchet (1st member)
25 Base plate (second member)
31 cam 37 pole guide 41 first pole 42 second pole 51 wire work spring

Claims (4)

A bottomed cylindrical first member in which internal teeth are formed on the inner cylindrical surface along the circumferential direction and one surface is an open surface;
A plurality of poles having external teeth engageable with the internal teeth;
The lock position is stacked on the open surface side of the first member and is rotatable relative to the first member in the circumferential direction, and the external teeth are engaged with the internal teeth, and the external teeth are from the internal teeth. A second member formed with a plurality of pole guides for guiding the pole between remote unlocking positions;
A cam rotatably provided between the first member and the second member for moving the pole toward the lock position;
At least one second cam provided between the cam and the pole and pushed by the cam to push the pole;
Have
The pole is guided between the two pole guides,
If the pole is in the locked position,
The relative rotation between the first member and the second member is prohibited, and the second cam is a reclining device that pushes the pole toward the lock position and brings the pole into close contact with one of the pole guides,
A spring is provided to press the pole in the direction of the second cam.   The reclining device according to claim 1, wherein there are at least two second cams.   The reclining device according to claim 1 or 2, wherein one end of the spring pushes the pole toward the second cam, and the other end of the spring is attached to the cam and biases the cam. . The one pole guide is formed with a groove into which one end of the spring is inserted,
In the lock position
4. The reclining device according to claim 3, wherein a gap is provided between one end of the spring and the groove in a direction opposite to the pressing direction of the pole in the second cam direction.