JP5701629B2 - Reclining device - Google Patents

Description

  The present invention has a bottomed cylindrical first member in which inner teeth are formed along the circumferential direction on the inner cylinder surface, and one surface is an open surface, and outer teeth that can mesh with the inner teeth. A plurality of poles, stacked on the open surface side of the first member, provided to be rotatable relative to the first member in the circumferential direction, and a lock position where the outer teeth mesh with the inner teeth; A shaft of relative rotation between the second member formed with a pole guide for guiding each of the poles between unlocked positions where the teeth are separated from the inner teeth, and the first member and the second member. It is provided so as to be rotatable on the upper side, and when it rotates in one direction, the outer teeth push the pole in the direction of meshing with the inner teeth, and when it rotates in the other direction, the outer teeth move away from the inner teeth. A lock release means for moving the pole, and an urging force for biasing the pole toward the lock position. And an arcuate guide formed on the inner cylindrical surface on the bottom side of the inner tooth of the first member, and contacting the arcuate guide along the circumferential direction, the pawl is brought into the unlocked position. An unlock holding mechanism comprising a holding contact portion, and the rotation of the first member and the second member is prohibited when the external teeth of the pole mesh with the internal teeth of the first member. The present invention relates to a reclining device.

  An example of a conventional reclining device will be described with reference to FIGS. FIG. 7 is a structural view of a seat, and FIG. 8 is an exploded perspective view of a conventional reclining device.

  As shown in FIG. 7, the seat 1 includes a seat cushion 2 that supports a seated person's buttocks, and a seatback 3 that is provided so as to be tiltable in the front-rear direction with respect to the seat cushion 2 and supports the back of the seated person. It has become. Reference numeral 4 denotes a reclining device that is provided on the rotation axis of the tilt of the seat back 3 and permits / inhibits the tilt of the seat back 3.

  Further, the reclining device 4 can be tilted from a forward tilt state to a rear tilt state. The seat back 3 can be allowed / prohibited from tilting between the first-stage locked state and the backward-tilted state and in the forward-tilted state. However, the unlocking is not performed between the first-stage locked state and the forward-tilted state. The holding mechanism (details will be described later) is in an unlocked holding state, and the seat cushion can be tilted without operating the operation lever.

  As shown in FIG. 9, the reclining device 4 includes a first member (ratchet) 7 provided on the seat back 3 having a bottomed cylindrical shape with one surface being an open surface, and is circumferentially formed on the inner cylindrical surface. The internal teeth 7a are formed along. The three poles 9 are formed with external teeth 9a that can mesh with the internal teeth 7a.

  A guide 7b that protrudes in the axial direction of the relative rotation along the circumferential direction is formed on the inner cylindrical surface of the first member 7 on the bottom surface 7g side from the inner teeth 7a. The guide 7b is composed of three types of arc-shaped protrusions with different amounts of protrusion in the axial direction of relative rotation. The first arcuate protrusion is the middle diameter portion 7 c having the same central angle as the angle of the reclining device 4 in the unlocked holding state. A large-diameter portion 7d and a large-diameter portion 7h are formed on both sides of the medium-diameter portion 7c. A small diameter portion 7e and a small diameter portion 7f are formed on the side opposite to the medium diameter portion 7c side of each large diameter portion 7d and the large diameter portion 7d.

  On the open surface side of the first member 7, a second member (base plate) 11 provided on the seat cushion 2 is laminated using an outer peripheral ring 10, and is rotatable relative to the first member 7 in the circumferential direction. . The second member 11 has both sides of each pole 9 sandwiched between the locked position where the outer teeth 9a mesh with the inner teeth 7a and the outer teeth 9a between the unlocked positions away from the inner teeth 7a. Three sets of pole guides 11a and 11b for guiding are formed.

  A cam 13 is provided as a lock release means between the first member 7 and the second member 11. The cam 13 is rotatably provided on the axis of relative rotation, and is formed with three arm portions 13a extending in the radial direction at a pitch of 120 degrees in the circumferential direction. A cam surface 13b is formed at the tip of each arm portion 13a.

  On the other hand, the pole 9 is formed with external teeth 9a, and is formed through an external tooth forming portion 9b facing the arcuate guide 7b of the first member 7, an external tooth forming portion 9b, and a step portion 9c. The base 7d is opposed to the bottom 7g of the member 7 and the arm 13a of the cam 13 is opposed to the base 9d. Furthermore, the cam surface 13 b of the cam 13 can come into contact with the step 9 c of the pole 9.

  Each arm portion 13 a of the cam 13 is formed with a protrusion 13 c that engages with a cam hole 9 e formed in each base portion 9 d of the pole 9.

  When the cam 13 rotates in one direction (the direction of arrow A in the figure), the cam surface 13b of the arm portion 13a pushes the step 9c of the pole 9, and the external teeth 9a mesh with the internal teeth 7a (lock position direction) ) Moves the pole 9. Further, when the cam 13 rotates in the other direction (counter arrow A direction in the figure), the direction in which the outer teeth 9a are separated from the inner teeth 7a by the protrusion 13c of the cam 13 and the cam hole 9e of the pole 9 (unlock position). The pole 9 moves in the direction).

  A spring 15 whose outer end is locked to the second member 11 and whose inner end is locked to the cam 13 causes the cam 13 to move in one direction, that is, the external teeth 9a of the pole 9 are It is biased in the direction of meshing with the teeth 7a (lock position direction).

  Further, one pole 9 ′ of the three poles 9 is formed with a protrusion 9 f that abuts on a surface parallel to the axis of relative rotation of the guide 7 b of the first member 7.

  In a state where the protrusion 9f of the pole 9 'faces the large diameter portion 7d of the guide 7b of the first member 7, the pole 9' and the pole 9 are moved from the locked position where the outer teeth 9a mesh with the inner teeth 7a to the outer teeth 9a. Can move to an unlock position away from the inner teeth 7a. On the other hand, in a state where the protrusion 9f of the pole 9 'faces the medium diameter part 7c of the guide 7b of the first member 7, the protrusion 9f abuts against the medium diameter part 7c by the biasing force of the spring 15, and the pole 9 The pole 9 'is held at a position where the outer teeth 9a and the inner teeth 7a do not mesh (unlocked position), and the other two poles 9 also do not mesh with the outer teeth 9a and the inner teeth 7a via the cam 13. (Unlock position). Further, the first member 7 and the second member 11 have a range in which the protrusion 9f of the pole 9 'abuts against the small diameter portion 7e and the small diameter portion 7f (in FIG. 7, a range between the forward-falling state and the backward-falling state). ) Is relatively rotatable.

  In this conventional example, the unlocking holding mechanism for holding the poles 9 and 9 ′ in the unlocked position is formed by the middle diameter portion 7 c of the guide 7 b of the first member 7 and the protrusion 9 f of the pole 9. Yes.

  Here, the operation of the reclining device having the above configuration will be described.

  When the seat back 3 is positioned between the first-stage locked state and the rearwardly tilted state, that is, when the protrusion 9f of the pole 9 'faces the large-diameter portion 7d of the guide 7b, the spring 15 is usually attached. Due to the force, each pole 9, 9 ′ provided on the second member 11 is in a locked position where the outer teeth 9 a mesh with the inner teeth 7 a of the first member 7, and the first member 7, the second member 11, The relative rotation of the seat back 3 is prohibited, and the seat back 3 cannot rotate relative to the seat cushion 2 (locked state).

  When the cam 13 is operated against the urging force of the spring 15 and rotated in the other direction, the poles 9 and 9 ′ are unlocked positions where the engagement between the outer teeth 9 a and the inner teeth 7 a is released. The first member 7 and the second member 11 can rotate relative to each other, and the seat back 3 can rotate with respect to the seat cushion 2.

  When the operating force on the cam 13 is released, the external teeth 9a of the poles 9, 9 'provided on the second member 11 are engaged with the internal teeth 7a of the first member 7 by the biasing force of the spring 15, Relative rotation between the first member 7 and the second member 11 is prohibited, and the locked state is established again.

  When the seat back 3 tilts forward from the first-stage locked state, that is, when the projection 9f of the pole 9 'faces the middle diameter portion 7c of the guide 7b, the pole 9, 9' is unloaded by the lock release holding mechanism. The seat back 3 is held in the locked position, and the seat back 3 can be tilted forward / backward without operating the cam 13. Then, when the seat back 3 is tilted forward in the unlocked and held state, the projecting portion 9f of the pole 9 'falls from the middle diameter portion 7c of the guide 7b to the large diameter portion 7h, and the spring 15, the external teeth 9 a of the poles 9, 9 ′ provided on the second member 11 are engaged with the internal teeth 7 a of the first member 7, and the first member 7 and the second member 11 are relative to each other. Rotation is prohibited and a locked state is entered. Further, when the seat back 3 is tilted backward in the unlocked and held state and the first stage locked state is reached, the protrusion 9f of the pole 9 'falls from the middle diameter portion 7c of the guide 7b to the large diameter portion 7d, and the spring 15 Due to the urging force, the external teeth 9a of the poles 9, 9 'provided on the second member 11 mesh with the internal teeth 7a of the first member 7, and the relative rotation between the first member 7 and the second member 11 is achieved. Is forbidden and locked.

JP 2009-247395 A

  However, in the reclining device shown in FIG. 8, the protrusion of the unlocking holding mechanism is provided on one pole 9 'of the three poles. Therefore, when the seat back 3 tilts forward / backward from the unlocked holding state and enters the locked state, among the three poles, the pole 9 ′ having the protrusion 9 first moves in the lock position direction, Due to the movement of the pole 9 ′, the other two poles 9 are moved to the lock position via the cam 13. That is, of the three poles, the external teeth of the pole 9 ′ having the protrusion 9f mesh with the internal teeth, and then the external teeth of the two poles 9 without the protrusion mesh with the internal teeth, and the lock timing. There is a problem that (meshing timing) is different.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a reclining device in which the lock timings of a plurality of poles are simultaneous when the unlocked holding state is released.

  The invention according to claim 1, which solves the problem, includes a cylindrical first member having a bottom, in which inner teeth are formed along the circumferential direction on the inner cylindrical surface, and one surface is an open surface, and the inner teeth A plurality of poles having external teeth that can be meshed with each other, stacked on the open surface side of the first member, and provided to be rotatable relative to the first member in the circumferential direction, and the external teeth are the internal teeth A second member in which a pole guide for guiding each of the poles is formed between an unlocked position where the outer teeth are separated from the inner teeth, and a first member and a second member. In between, it is rotatably provided on the axis of relative rotation, and when rotating in one direction, the outer teeth move the pole in a direction to mesh with the inner teeth, and when rotating in the other direction, the outer teeth Lock release means for moving the pole in a direction away from the inner teeth, and the pole An urging means for urging in the lock position direction, an arcuate guide formed on the inner cylindrical surface of the first member on the bottom surface side from the inner teeth, and abutting on the arcuate guide along the circumferential direction And an unlocking holding mechanism comprising a contact portion for holding the pawl in the unlocked position, and the first member is formed by engaging outer teeth of the pawl with the inner teeth of the first member. In the reclining device in which relative rotation between the first member and the second member is prohibited, the lock release means includes a first cam rotatably provided on the relative rotation shaft, and the first cam and the plurality of poles. A second cam that is provided between at least one of the poles and that pushes the pole in a direction in which the outer teeth mesh with the inner teeth when pushed by the first cam rotating in one direction. And the contact of the unlocking holding mechanism Is a reclining device, characterized in that the projections provided on the second cam.

The invention according to claim 2 is the reclining device according to claim 1, wherein the pole is pushed only in the lock position direction by the second cam .

  According to the first aspect of the present invention, the lock release means includes a first cam rotatably provided on the relative rotation shaft, and at least one of the first cam and the plurality of poles. And a second cam that pushes the pole in a direction in which the outer teeth mesh with the inner teeth when pushed by the first cam rotating in one direction, and holding the unlocking The contact portion of the mechanism is a protrusion provided on the second cam, so that when the lock holding mechanism is released from the state where the pole is held at the unlock position by the lock release holding mechanism, The abutting portion of the cam moves away from the guide, and the second cam moves in the direction of pushing the pawl and rotates the release plate and the first cam in one direction. As the first cam rotates in one direction, the external teeth of the plurality of poles simultaneously mesh with the internal teeth, and the lock timing becomes simultaneous.

It is a disassembled perspective view of the reclining apparatus of this embodiment. It is the front view seen from the arrow C direction at the time of attaching the reclining apparatus of FIG. FIG. 3 is a cross-sectional view taken along a cutting line AA in FIG. 2. FIG. 3 is a cross-sectional view taken along a cutting line BB in FIG. 2. It is a perspective view of the 1st pole and 2nd cam of FIG. It is the perspective view seen from the arrow D direction of FIG. It is a lineblock diagram of a sheet. Ru It is a disassembled perspective view of the conventional reclining apparatus.

  Next, embodiments of the present invention will be described with reference to the drawings.

  Like the reclining device 4 shown in FIG. 7, the glue climbing device of the present embodiment is provided on the rotation axis of the tilt of the seat back 3.

  The reclining apparatus of this embodiment is demonstrated using FIGS. 1 is an exploded perspective view of the reclining device of the present embodiment, FIG. 2 is a front view seen from the direction of arrow C when the reclining device of FIG. 1 is assembled, and FIG. 3 is a cross section taken along the section line AA of FIG. 4 is a cross-sectional view taken along a cutting line BB in FIG. 2, FIG. 5 is a perspective view of the first pole and the second cam in FIG. 1, and FIG. 6 is a perspective view seen from the direction of arrow D in FIG. It is.

  1 to 4, a ratchet (first member) 21 provided on the seat back side is a bottomed cylindrical shape obtained by half-cutting a disk-shaped plate material by a press, and a circular recess 21a is formed. Inner teeth 23 are formed in the entire circumferential direction on the inner circumferential surface of the circular recess 21a. A through hole 21b is formed at the center of the circular recess 21a.

  The base plate (second member) 25 provided on the seat cushion side is also formed by half-cutting a disk-shaped plate material by pressing to form a circular recess 25a. The diameter of the circular recess 25 a is set slightly larger than the outer diameter of the ratchet 21. And the ratchet 21 is engage | inserted by the circular recessed part 25a, and the baseplate 25 and the ratchet 21 can be rotated relatively. Further, a through hole 21 b is formed in the center of the ratchet 21.

  The outer peripheral portion of the ratchet 21 and the outer peripheral portion of the base plate 25 are sandwiched by a ring-shaped outer peripheral ring 27, and the ratchet 21 and the base plate 25 are separated in the direction of the axis of relative rotation (O in FIG. 1). Without being relatively rotatable.

  A first 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. The first cam 31 has a main body 31b extending on a plane orthogonal to the axis of relative rotation, a cylindrical shape, a shaft that is rotatably supported by the hole 25b of the base plate 25, and protrudes to the outside through the hole 25b. 31a. The cross-sectional shape of the shaft portion 31a on a plane orthogonal to the axis of relative rotation is a substantially oval shape. The main body 31b is formed with two protrusions 31c protruding in the ratchet 21 direction.

  A release plate 33 is disposed between the first cam 31 and the circular recess 21 a of the ratchet 21. The release plate 33 is formed with a hole 33a in which the protrusion 31c of the first cam 31 is engaged. The first cam 31 and the release plate 33 are rotated together by the engagement of the protrusion 31c and the hole 33a.

  Between the release plate 33 and the circular recess 25a of the base plate 25, a total of four first poles 41 and second poles 43 are alternately arranged along the circumferential direction.

  Outer teeth 41 a and 43 a that can mesh with the inner teeth 23 are formed on the surfaces of the first pole 41 and the second pole 43 facing the inner teeth 23.

  Four pole guides 37 are formed in the circular recess 25 a of the base plate 25 so as to sandwich the side portions of the first pole 41 and the second pole 43. The pole guide 37 allows the first pole 41 and the second pole 43 to move only in the radial direction of relative rotation. That is, the pole guide 37 has a lock position in which the external teeth 41 a and the external teeth 43 a mesh with the internal teeth 23 of the ratchet 21, and an external position between the external teeth 41 a and the external teeth 43 a in the unlocked position apart from the internal teeth 23 of the ratchet 21. The first pole 41 and the second pole 43 are guided.

  A second cam 45 is disposed between the first pole 41 and the first cam 31.

  Here, the 1st pole 41 and the 2nd cam 45 are demonstrated using FIG. 4, FIG.

  On one side of the surface of the first pole 41 that faces the release plate 33, the back surface of the first pole 41 (the surface opposite to the surface on which the external teeth 41a of the first pole 41 are formed) extends to the external teeth 41a. A concave portion 41b is formed. And the bottom face side of the recessed part 41b is the laminated part 41c.

  On the other hand, the second cam 45 is fitted to the contact portion 45a that can contact the back surface of the first pole 41 and the concave portion 41b of the first pole 41, and overlaps the stacked portion 41c in the axial direction of relative rotation. Part 45c.

  Returning to FIG. 1 to FIG. 4, a protrusion 41 d and a protrusion 43 d that protrude in the direction of the release plate 33 are formed on the surfaces of the first pole 41 and the second pole 43 that face the release plate 33. The release plate 33 is formed with a protrusion 41d of the first pole 41 and the second pole 43, a cam hole 33b and a cam hole 33c with which the protrusion 43d engages. The cam hole 33b and the cam hole 33c are formed on the outer teeth 41a of the first pole 41 and the second pole 43 along the pole guide 37 when the release plate 33 rotates in the arrow T direction (the other direction) in FIG. The outer teeth 43a are set to a shape in which the first pole 41 and the second pole 43 are moved in a direction away from the inner teeth 23 of the ratchet 21 (unlock position direction).

  Four first protrusions 31d and four second protrusions 31e are alternately formed on the outer peripheral portion of the main body 31b of the first cam 31 along the circumferential direction. When the first cam 31 rotates in the direction opposite to the direction of the arrow T in FIG. 1 (one direction), the first protrusion 31d is formed in a V-shaped groove formed in a portion of the second cam 45 facing the first cam 31. 45b (see FIG. 5 and FIG. 6) and the inclined surface of the V-shaped groove 43b formed on the second pole 43 facing the first cam 31 and pressed by the second pole 43 and the second cam 45. The first pole 41 moves along the pole guide 37 in a direction (lock position direction) in which the external teeth 41 a and the external teeth 43 a mesh with the internal teeth 23 of the ratchet 21. Further, the second protrusion 31e is a protrusion formed at a portion of the first pole 41 facing the first cam 31 when the first cam 31 rotates in the direction opposite to the arrow T direction (one direction) in FIG. The protrusion 41c formed on the portion 41e (see FIGS. 5 and 6) and the portion of the second pole 43 facing the first cam 31 is opposed to the protrusion 43c with a slight gap.

  The inner end portion of the spiral spring 51 is locked to the shaft portion 31 a of the first cam 31 protruding outward from the base plate 25. The outer end portion of the spiral spring 51 is locked to the base plate 25. The spiral spring 51 urges the first cam 31 in the direction opposite to the arrow T direction (one direction). Therefore, the spiral spring 51 functions as a biasing unit that biases the first pole 41 and the second pole 43 in the lock position direction.

  Here, the lock release holding mechanism for holding the first pole 41 and the second pole 43 of the present embodiment in the unlock position will be described.

  An arcuate guide 61 along the circumferential direction is formed on the inner cylindrical surface of the bottom surface of the inner teeth 23 of the ratchet (first member) 21. The guide 61 is composed of two types of arc-shaped protrusions with different protrusion amounts in the axial direction of relative rotation. The first arc-shaped protrusions are two small-diameter portions 61a having the same central angle as the angle in the unlocking holding state of the reclining device. The second projecting portions are two large-diameter portions 61b that are smaller than the small-diameter portion 61a between the two small-diameter portions 61a.

  The second cam 45 is formed with a protrusion 45d that can abut on a surface parallel to the axis of relative rotation of the arcuate guide 61 (small diameter portion 61a, large diameter portion 61b) of the ratchet 21. In the present embodiment, in a state where the second cam 45 is stacked on the first pole 41, the protrusion 45d of the second cam 45 is provided so as to be positioned at the center in the circumferential direction of the first pole 41. Yes.

  The protruding amount (height) of the large diameter portion 61b is such that the protruding portion 45d of the second cam 45 faces the large diameter portion 61b of the guide 61 of the ratchet 21 and the second cam 45 and the first pole 41 stacked. The protrusion 45d of the second cam 45 moves from the locked position where the outer teeth 41a mesh with the inner teeth 23 to the unlocked position where the outer teeth 41a move away from the inner teeth 23 without coming into contact with the large diameter portion 61b. It is set as possible.

  The protruding amount (height) of the small-diameter portion 61a is such that when the stacked second cam 45 and the first pole 41 try to move to the lock position where the external teeth 41a mesh with the internal teeth 23, the external teeth 41a 23 is set so that the protrusion 45d of the second cam 45 abuts on the small-diameter portion 61a of the guide 61 of the ratchet 21 and the movement of the second cam 45 to the locked position is prohibited. When the movement of the second cam 45 is prohibited, the rotation of the first cam 31 in the direction opposite to the arrow T direction (one direction) is prohibited, and the first pole 41 and the second pole 43 are held in the unlocked position. Is done.

  Therefore, in the present embodiment, the first pole 41 and the second pole 43 are held in the unlocked position by the small diameter portion 61a of the guide 61 of the ratchet (first member) 21 and the protrusion 45d of the second cam 45. An unlocking holding mechanism is formed.

  Here, the operation of the reclining device having the above configuration will be described.

  When the seat back is positioned between the first-stage locked state and the rearwardly tilted state (see FIG. 7), that is, in the state where the protrusion 45d of the second cam 45 faces the large diameter portion 61b of the guide 61 of the ratchet 21, Usually, the first pole 41 and the second pole 43 provided on the base plate 25 via the first cam 31 by the biasing force of the spiral spring 51 are external teeth 41 a and external teeth 43 a are internal teeth 23 of the ratchet 21. The ratchet (first member) 21 and the base plate (second member) 25 are prohibited from rotating relative to each other, and the seat back cannot rotate relative to the seat cushion (locked state).

  When the first cam 31 is operated and rotated in the other direction against the urging force of the spiral spring 51, the first pole 41 and the second pole 43 are connected to the external teeth 41a, The outer teeth 43a move to the unlocked position where the meshing with the inner teeth 23 of the ratchet 21 is released, and the ratchet (first member) 21 and the base plate (second member) 25 can be rotated relative to each other. Is rotatable with respect to the seat cushion.

  When the operating force of the first cam 31 is released, the first pole 41 and the second pole 43 are engaged with the external teeth 41a and the external teeth 43a with the internal teeth 23 of the ratchet 21 by the urging force of the spiral spring 51. Relative rotation between the ratchet (first member) 21 and the base plate (second member) 25 is prohibited, and the locked state is established again.

  When the seat back is tilted forward from the first-stage locked state, that is, when the protrusion 45d of the second cam 45 faces the small-diameter portion 61a of the guide 61, the first pole 41 and the second pole are released by the lock release holding mechanism. 43 is held in the unlocked position, and the seat back can be tilted forward / backward without operating the first cam 31.

  Then, when the seat back is tilted backward in the unlocked and held state and the first-stage locked state is reached, the projection 45d of the second cam 45 falls from the small diameter portion 61a of the guide 61 to the large diameter portion 61b, and the spiral spring 51 Due to the urging force of the first pole 41 and the second pole 43, the outer teeth 41a and the outer teeth 43a mesh with the inner teeth 23 of the ratchet 21, and the ratchet (first member) 21 and the base plate (second member) 25 are engaged. Relative rotation is prohibited and the lock state is established.

  According to such a configuration, the following effects can be obtained.

 (1) When the lock holding mechanism is released from the state in which the first pole 41 and the second pole 43 are held at the unlocked position by the lock release holding mechanism, the protrusion 45d of the second cam 45 has a small diameter portion (guide The second cam 45 moves away from 61a in a direction to push the first pole 41, and rotates the release plate 33 and the first cam 31 in one direction. When the first cam 31 rotates in one direction, the plurality of poles, the two first poles 41, the external teeth 41a and the external teeth 43a of the second pole 43 mesh with the internal teeth 23 at the same time, and the lock timing is simultaneous. It becomes.

 (2) The first pole 41 and the second cam 45 have a laminated portion 41c and a laminated portion 45c that overlap each other in the axial direction of relative rotation, and the protrusion 45d of the second cam 45 is a laminated portion of the second cam 45. By providing in the part 45c, the freedom degree of the position which provides the protrusion 45d of the 2nd cam 45 becomes large.

  Further, since the length of the portion guided by the pole guide 37 of the base plate (second member) 25 of the first pole 41 is increased, the play between the first pole 41 and the pole guide 37 of the base plate 25 is reduced.

(3) With the second cam 45 stacked on the first pole 41, the protrusion 45d of the second cam 45 is
Since the first pole 41 is provided so as to be positioned at the center in the circumferential direction, when the reclining devices having the same structure are provided on the left and right sides of the seat, the first pole can be shared.

  The present invention is not limited to the above embodiment. In the above embodiment, the two second cams 45 are used, but one second cam may be used. Further, two poles may be driven by one second cam.

  Further, the shape of the second cam may be a circular second cam disposed between the first pole and the first cam.

  Further, in the above embodiment, the ratchet 21 is provided on the seat back side and the base plate 25 is provided on the seat cushion side. However, the ratchet 21 may be provided on the seat cushion side and the base plate 25 may be provided on the seat back side.

21 Ratchet (first member)
25 Base plate (second member)
31 First cam 45 Second cam 45d Projection

Claims (2)

A bottomed cylindrical first member in which inner teeth are formed along the circumferential direction on the inner cylindrical surface, and one surface is an open surface;
A plurality of poles having external teeth meshable with the internal teeth;
It is laminated on the open surface side of the first member, is provided so as to be rotatable relative to the first member in the circumferential direction, and a lock position where the external teeth mesh with the internal teeth, and the external teeth from the internal teeth A second member formed with a pole guide for guiding each of the poles between distant unlocked positions;
Between the first member and the second member, it is rotatably provided on the axis of relative rotation, and when it rotates in one direction, the outer teeth move the pole in a direction to mesh with the inner teeth. A lock release means for moving the pole in a direction in which the outer teeth move away from the inner teeth when rotated in the other direction;
Biasing means for biasing the pole toward the lock position;
Formed on the inner cylindrical surface of the first member on the bottom surface side from the inner teeth, the arc-shaped guide along the circumferential direction, and abutting against the arc-shaped guide, holds the pole in the unlocked position. An unlocking holding mechanism comprising a contact portion;
Have
In the reclining device in which relative rotation between the first member and the second member is prohibited by engaging the outer teeth of the pole with the inner teeth of the first member,
The lock release means includes
A first cam rotatably provided on the axis of relative rotation;
Provided between the first cam and at least one of the plurality of poles, and when pushed by the first cam rotating in one direction, the outer teeth are engaged with the inner teeth in the direction. A second cam that pushes the pole,
Have
The reclining device, wherein the contact portion of the unlocking holding mechanism is a protrusion provided on the second cam. The reclining device according to claim 1, wherein the pole is pushed only in the lock position direction by the second cam.

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