JP5714926B2 - Reclining device - Google Patents

Description

  The present invention includes a first member formed with internal teeth along a circumferential direction, a plurality of poles having external teeth meshable with the internal teeth, and relative rotation in the circumferential direction with the first member. And a second member formed with a first guide for sandwiching both side surfaces of each pole and guiding each of the poles in the radial direction of the circumference, and the outer teeth of the first member The present invention relates to a reclining device in which relative rotation between the first member and the second member is prohibited by meshing with teeth.

  An example of a conventional reclining device will be described with reference to FIGS. FIG. 9 is an exploded perspective view of a conventional reclining device for a vehicle seat, and FIG. 10 is a configuration diagram of the seat.

  As shown in FIG. 10, the seat 1 includes a seat cushion 2 that supports a seated person's buttocks, and a seat back 3 that is provided so as to be tiltable in the front-rear direction with respect to the seat cushion 2 and that supports the back part 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.

  As shown in FIG. 9, the reclining device includes a first member 7 in which inner teeth 7 a are formed along the circumferential direction, and a hole 7 b penetrating along the central axis of the circumference is formed. It has the member 7 and the 2nd member 5 provided in the said circumferential direction so that relative rotation was possible, and the hole 5b penetrated along the central axis of the said circumference was formed. In this conventional example, the first member 7 is attached to the seat back 3 side, and the second member 5 is attached to the seat cushion 2 side.

  Between the first member 7 and the second member 5, four poles 10 having external teeth 10a that can mesh with the internal teeth 7a are arranged. The second member 5 is formed with guides 5a that guide the poles 10 in the radial direction with both side surfaces of the poles 10 interposed therebetween. Further, between the first member 7 and the second member 5, a cam 9 is rotatably supported in the hole 7b of the first member and the hole 5b of the second member 5 and rotates on the rotation shaft of relative rotation. Has been placed. In the peripheral part of the cam 9, a concave part 9 a and a protruding part 9 b are formed along the circumferential direction according to each pole 10. Further, on the surface of each pole 10 opposite to the surface on which the external teeth 10a are formed, there are a recess 10b into which the protrusion 9b of the cam 9 can enter and a protrusion 10c that can enter into the recess 9a of the cam 9. Is formed.

  For this reason, when the cam 9 is rotated in one direction, the protrusion 9b of the cam 9 pushes the surface 10d opposite to the external teeth 10a of the pole 10 (hereinafter referred to as the back surface), and the external teeth 10a become the first member 7. The pole 10 is driven in the direction of meshing with the inner teeth 7a. Conversely, when the cam 9 is rotated in the other direction, the protrusion 9b of the cam 9 enters the recess 10b of the pole 10, and the external teeth 10a pulls the pole 10 away from the internal teeth 7a of the first member 7. It is like that.

  When the back surface 10d of each pole 10 is pushed by the protrusion 9b of the cam 9, the force that moves the pole 10 in the direction in which the outer teeth 10a mesh with the inner teeth 7a, and the second member 5 side, It is a surface (slope) on which a force for moving the pole 10 to the surface of the guide 5a on the counterclockwise direction is generated.

  The first member 7 is provided with a stopper plate 11 having a hole 11a formed at the center. The stopper plate 11 is formed with four holes 11a, and the four protrusions 7e formed on the first member 7 are fitted into the holes 11a so that the stopper plate 11 is fixed. The stopper protrusion 5c formed on the second member 5 is formed on the standing wall 11c of the protrusion 11b formed on the stopper plate 11 fixed to the first member 7. The first member 7 and the second member 5 can be rotated relative to each other within a range in contact with the standing wall portion 11d of the projection 11b formed on the stopper plate 11 fixed to the first member 7. That is, the seat back 3 can tilt within the range of the angle θ in FIG.

  In addition, the spring 9 whose outer end is locked to the second member 5 and whose inner end is locked to the cam 9 causes the cam 9 to move in one direction, that is, the outer teeth 10 a of the pole 10 are in the first member 7. The inner teeth 7a are biased in the direction of meshing.

  Normally, each pole 10 provided on the second member 5 is in a locked position where the outer teeth 10a mesh with the inner teeth 7a of the first member 7 by the biasing force of the spring 13, and the first member 7 and the second member Relative rotation with the member 5 is prohibited, and the seat back 3 is in a state where it cannot rotate relative to the seat cushion 2 (locked state).

  When the cam 9 is operated against the urging force of the spring 13 and rotated in the other direction, each pole 10 moves to the unlocked position where the engagement between the external teeth 10a and the internal teeth 7a is released. Thus, the first member 7 and the second member 5 can be rotated relative to each other (unlocked state), and the seat back 3 can rotate with respect to the seat cushion 2.

  When the operating force on the cam 9 is released, the external teeth 10a of the poles 10 provided on the second member 5 are engaged with the internal teeth 7a of the first member 7 by the biasing force of the spring 13, and the first member 7 is engaged. And relative rotation between the second member 5 and the second member 5 are prohibited, and the locked state is established again.

  Furthermore, the first member 7 is formed with a protrusion 7c and a protrusion 7d that protrude toward the center of the circumference along the circumferential direction. One of the four poles 10 ′ (the lowest pole in FIG. 9) is formed with a protrusion 7 c and a protrusion 10 d that can ride on the top of the protrusion 7 d in the protruding direction. Note that the protrusions 7c and 7d are projected so that the outer teeth 10a 'of the pole 10' are separated from the inner teeth 7a of the first member 7 via the cam 90 when the protrusion 10d of the pole 10 'rides on. The amount is set to hold the pole 10 'at the position.

  Therefore, when the seat back 3 is rotated with respect to the seat cushion 2 in the unlocked state and the protrusion 10d of the pole 10 'reaches the protrusion 7c or the protrusion 7d, the operation force to the cam 9 is released. The protrusion 10d of the pole 10 'rides on the protrusion 7c or the protrusion 7d, and the pole 10' is held in the unlocked state. Further, the three poles 10 other than the pole 10 ′ are also held in the unlocked state via the cam 9. Accordingly, the first member 7 and the second member 5 can be rotated relative to each other without operating the cam 9. In this specification, this state is referred to as a “lock-free state”.

  Then, when the first member 7 and the second member 5 are relatively rotated in the lock-free state, and the protrusion 10d of the pole 10 ′ is disengaged from the protrusion 7c or the protrusion 7d, the pole 10 ′ returns to the locked state. . Next, the three poles 10 other than the pole 10 ′ are also returned to the locked state via the cam 9.

JP 2009-247395 A

  In the reclining device shown in FIG. 9, the first member 7 and the second member 5 rotate relative to each other in the lock-free state, and the protrusion 10d of the pole 10 ′ comes off from the protrusion 7c or the protrusion 7d. When released, the pole 10 'first returns from the unlocked state to the locked state. Next, when the pole 10 ′ returns to the locked state, the three poles 10 other than the pole 10 ′ return from the unlocked state to the locked state via the cam 9. That is, the return timing of the pole to the locked state is different.

  Therefore, when the pole 10 ′ returns to the locked state and the three poles 10 other than the pole 10 ′ have not yet returned to the locked state, the locking force is small, and the three poles 10 other than the pole 10 ′ are in the locked state. A predetermined locking force is generated only after returning to the state.

  When the force to rotate the first member 7 and the second member 5 is large in the lock-free state, the lock force is small even if only the pole 10 ′ is returned to the locked state, so the pole 10 ′ is locked. There is a problem that the phenomenon that the pole 10 and the external teeth 10a and external teeth 10a 'of the pole 10' slide on the internal teeth 7a (tooth skipping phenomenon) occurs.

  The present invention has been made in view of the above problems, and its problem is that a reclining device in which when a lock-free state is released, a plurality of poles simultaneously return to the locked state and a large locking force is generated instantaneously. Is to provide.

The invention according to claim 1 for solving the problem includes a first member in which internal teeth along the circumferential direction are formed;
A plurality of poles having external teeth that can mesh with the internal teeth, the first member and the first member are provided so as to be relatively rotatable in the circumferential direction, sandwiching both side surfaces of each pole, and the external teeth are the internal teeth A second member in which a guide for guiding each pole is formed between an unlocked position where the outer teeth are separated from the inner teeth, and the outer teeth are the inner teeth of the first member. In a reclining device in which relative rotation between the first member and the second member is prohibited by meshing with
A protrusion projecting toward the center of the circumference along the circumferential direction of the first member and the first member and the second member are disposed between the first member and the second member, and can be rotated on the rotation axis of the relative rotation. The first cam and the first cam, which are disposed between at least two of the plurality of poles, and are opposite to the surface on which the external teeth of the pole are provided when pushed by the first cam. A second cam having a protrusion formed on the top in the protruding direction of the protrusion, and pressing the side surface to move the poles in a direction in which the outer teeth mesh with the inner teeth. Biasing means for biasing the pole in a direction in which the external teeth mesh with the internal teeth, and when the protrusion of the second cam rides on the top of the protrusion of the first member, all the external teeth are A reclining device that holds each pole at a position distant from the internal teeth A.
The invention according to claim 2 is the reclining device according to claim 1, wherein the pawl with the second cam disposed therebetween is pressed in the lock position direction only by the second cam. .

  When the external teeth of the pole mesh with the internal teeth of the first member, the relative rotation between the first member and the second member is prohibited (locked state).

  When the poles are moved in a locked state against the biasing force of the biasing means in a direction in which the outer teeth move away from the inner teeth, the first member and the second member can rotate relative to each other ( Unlocked).

  When the first member and the second member are rotated relative to each other in the unlocked state and the protrusion of the second cam reaches the protrusion, the protrusion of the second cam rides on the protrusion, and all the plurality of poles are unlocked. It is kept locked. Therefore, even if the release means is not operated, the first member and the second member are in a lock-free state in which relative rotation is possible.

  When the first member and the second member are further rotated relative to each other in the lock-free state, and the protrusion of the second cam is removed from the protrusion, the second cam causes at least two or more poles to be urged by the urging force of the urging means. The two or more poles pushed and pushed by the second cam return to the locked state.

  According to the first aspect of the present invention, the first member is disposed between the first member and the second member, the protrusion protruding toward the center of the circumference along the circumferential direction of the first member, The first cam that is rotatable on the rotation shaft of the relative rotation, the first cam, and the plurality of poles are arranged between at least two poles, and when the first cam is pushed, the pole A protrusion that can press the surface opposite to the surface on which the outer teeth are provided, move the poles in a direction in which the outer teeth mesh with the inner teeth, and ride on the top of the protrusion in the protruding direction. And a biasing means for biasing the pole in a direction in which the outer teeth mesh with the inner teeth, and the protrusion of the second cam is a protrusion of the protrusion of the first member. When riding on the top, all external teeth hold each pole in a position away from the internal teeth. When the projection of the first cam rides on the top of the projection of the first member in the protruding direction (lock-free state), the first member and the second member rotate relative to each other, and the projection of the second cam When the arm is disengaged from the top of the protrusion, at least two or more poles are simultaneously returned to the locked state by the biasing force of the biasing means. Therefore, a large locking force is instantly generated.

It is a disassembled perspective view of the reclining apparatus of this embodiment. It is the perspective view seen from the arrow C direction at the time of attaching the reclining apparatus of FIG. It is the figure seen from the arrow C direction in the state which removed the outer periphery ring and ratchet at the time of attaching the reclining apparatus of FIG. In FIG. 3, it is sectional drawing in the cutting | disconnection line AA in the state which assembled | attached the outer periphery ring and the ratchet. In FIG. 3, it is sectional drawing in the cutting | disconnection line BB in the state which assembled | attached the outer periphery ring and the ratchet. It is the figure seen from the arrow D direction at the time of attaching the reclining apparatus of FIG. It is the figure seen from the arrow E direction at the time of attaching the reclining apparatus of FIG. It is a figure explaining the reclining apparatus of another form example. It is a disassembled perspective view of the conventional reclining device for seats of vehicles. It is a lineblock diagram of a sheet.

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

  Similar to the reclining device 4 shown in FIG. 10, the glue climbing device according to 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. 1-7. 1 is an exploded perspective view of the reclining device of the present embodiment, FIG. 2 is a perspective view seen from the direction of arrow C when the reclining device of FIG. 1 is assembled, and FIG. 3 is an outer periphery when the reclining device of FIG. FIG. 4 is a view seen from the direction of arrow C with the ring and ratchet removed, FIG. 4 is a cross-sectional view taken along the line A-A in the state where the outer ring and ratchet are assembled, and FIG. 5 is FIG. FIG. 6 is a cross-sectional view taken along the line BB when the outer ring and the ratchet are assembled, FIG. 6 is a view seen from the direction of arrow D when the reclining device of FIG. 1 is assembled, and FIG. 7 is the reclining device of FIG. It is the figure seen from the arrow E direction at the time of attaching.

  In FIG. 1, a ratchet (first member) 21 provided on the seat back side is formed by half-cutting a disk-like plate material by a press to form a circular recess 21a. 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. A through hole 25 b is formed in the center of the ratchet 21. The diameter of the hole 25b of the base plate 25 is set larger than the diameter of the hole 21a 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.

  In the space formed by the circular recess 21a of the ratchet 21 and the circular recess 25a of the base plate 25, the first cam 31 including the cam body 31c, the first shaft portion 31a, and the second shaft portion 31b is disposed. The first shaft portion 31 a is formed on one surface side of the cam body 31 c and is rotatably supported in the hole 21 a of the ratchet 21. The second shaft portion 31b is formed on one surface side of the first cam 31 so as to be coaxial with the first shaft portion 31a. In the present embodiment, the first shaft portion 31a and the second shaft portion 31b are oval cylinders having the same cross section.

  A release plate (release means) 33 is disposed between the first cam 31 and the circular recess 21 a of the ratchet 21. An oval hole 33a that is slightly larger than the cross-sectional shape of the first shaft portion 31a of the first cam 31 is formed at the center of the release plate 33. When the first shaft portion 31a of the first cam 31 is inserted into the hole 33a, the first cam 31 and the release plate 33 rotate together.

  As shown in FIGS. 1, 2, and 3, a total of four poles 41 and 43 are arranged along the circumferential direction between the release plate 33 and the circular recess 25 a of the base plate 25. Yes. Furthermore, as shown in FIG. 3, the pole 41 and the pole 43 have a symmetrical shape (axisymmetric shape) with respect to a line segment along the radial direction of the circumference.

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

  In the circular recess 25a of the base plate 25, two first protrusions 35 protruding in the direction of the ratchet 21 are formed at intervals of 180 ° along the circumferential direction. Between the two first protrusions 35, two second protrusions 37 and two third protrusions 39 are formed at intervals of 180 ° along the circumferential direction. Both side portions of the first projecting portion 35 are guide surfaces 35a and 35b which are orthogonal to the bottom surface of the circular recess 25a of the base plate 25 and parallel to the radial direction of the circumference. Both side portions of the second projecting portion 37 are guide surfaces 37a and 37b which are orthogonal to the bottom surface of the circular concave portion 25a of the base plate 25 and parallel to the radial direction of the circumference. Both side portions of the third protrusion 39 are guide surfaces 39a and 39b which are orthogonal to the bottom surface of the circular recess 25a of the base plate 25 and parallel to the radial direction of the circumference.

  And the space | interval of the guide surface 35a of the 1st protrusion part 35 and the guide surface 39a of the 3rd protrusion part 39 is set a little wider than the width | variety of the pole 41, and the pole 41 is arrange | positioned between these two guide surfaces. Thus, the first protrusion 35 and the third protrusion 39 function as a guide (first guide) for guiding the pole 41 in the circumferential radial direction. Similarly, the guide surface 35b of the first projecting portion 35 and the guide surface 37a of the second projecting portion 37 are set slightly wider than the width of the pole 43, and the pole 43 is arranged between these two guide surfaces. Thus, the first protrusion 35 and the second protrusion 37 function as a guide (first guide) for guiding the pole 43 in the radial direction of the circumference.

  A protrusion 41b that protrudes in the direction of the first cam 31 is formed on the first protrusion 35 side of the surface opposite to the surface on which the external teeth 41a of the pole 41 are formed (hereinafter referred to as the back surface). On the 39 side, a recess 41c is formed. A protrusion 43b protruding in the direction of the first cam 31 is formed on the first protrusion 35 side of the surface opposite to the surface on which the external teeth 43a of the pole 43 are formed (hereinafter referred to as the back surface). On the side of the two projecting portions 37, a recess 43c is formed.

  Then, two second cams 45 are arranged so as to straddle the two adjacent poles 41 and 43 via the second protrusion 37 and the third protrusion 39. Each second cam 45 includes a main body portion 45 a and a guide portion 45 b extending toward the internal teeth 23. On the other hand, the distance between the guide surface 37b of the second projecting portion 37 and the guide surface 39b of the third projecting portion 39 is set slightly larger than the width of the guide portion 45b of the second cam 45, and between these two guide surfaces. By arranging the guide portion 45b of the second cam 45, the second protrusion 37 and the third protrusion 39 function as a guide (second guide) for guiding the second cam 45 in the circumferential radial direction.

  Lock portions 45 d and 45 c that can come into contact with the recess 41 c of the pole 41 and the recess 43 c of the pole 43 are formed on the surface of the main body 45 a of the second cam 45 that faces the pole 41 and the pole 43.

  On the periphery of the cam main body 31c of the first cam 31, there are formed a pole 41, a protrusion 41b formed on the back surface of the pole 43, and four pole protrusions 31d with which the protrusion 43b can abut. Further, when the first cam 31 rotates in one direction on the peripheral portion of the cam body 31c of the first cam 31, the side opposite to the surface on which the lock portions 45c and 45d of the body portion 45a of the second cam 45 are formed. The second cam projection 31e that pushes the pole 41 and the pole 43 in the direction in which the outer teeth 41a and the outer teeth 43a mesh with the inner teeth 23 of the ratchet 21 is formed.

In the present embodiment, as shown in FIG. 8 , the surface of the concave portion 43c of the pole 43 with which the lock portion 45c of the second cam 45 abuts is pressed against the external teeth 43a when the lock portion 45c of the second cam 45 is pressed. Is a slope that generates a force consisting of a component force that drives the pole 43 in a direction to mesh with the inner teeth 23 of the ratchet 21 and a component force that pushes the pole 43 toward the first protrusion 35.

  Similarly, the surface of the recess 41c of the pole 41 with which the lock portion 45d of the second cam 45 abuts is the direction in which the external teeth 41a mesh with the internal teeth 23 of the ratchet 21 when the lock portion 45d of the second cam 45 is pressed against it. The slope is such that a force is generated which includes a component force for driving the pole 41 and a component force for pushing the pole 41 toward the first protrusion 35.

  That is, of the pressing contact between the second cam 45 and the poles 41, 43, the pressing contact between the second cam 45 and the pole 41 is performed by the first guide 35 on the clockwise side when viewed from the base plate (second member) 25. The pole 41 is moved to the surface 35 a, and the other pressing contact between the second cam 45 and the pole 43 is the surface 35 b of the first guide 35 on the counterclockwise side when viewed from the base plate (second member) 25. The pole 43 is moved.

  The outer end of the hole 25b of the base plate 25 is locked to one of the two grooves 25c extending in the radial direction formed on the wall peripheral surface of the hole 25b, and the inner end is the first end. A spiral spring (biasing means) 47 wound around a second shaft portion 31b having a cross-sectional shape of the cam 31 is disposed. Due to the biasing force of the spiral spring 47, the first cam 31 is biased in a direction in which the outer teeth 41 a and the outer teeth 43 a of the pole 41 and the pole 43 mesh with the inner teeth 23 of the ratchet 21.

  The pole 41, the pole 43, and the second cam 45 are formed with a protrusion 41d, a protrusion 43d, and a protrusion 45e that protrude in the direction of the release plate 33, respectively. On the other hand, the projection 41d of the pole 41, the projection 43d of the pole 43, and the projection 45e of the second cam 45 are engaged with the release plate 33 and rotated, whereby the pole 41, the pole 43, and the second cam 45 are rotated. A cam hole 33b and a cam hole 33c are formed. When the first cam 31 (release plate 33) is rotated in the other direction, the cam holes 33b and 33c are arranged so that the external teeth 41a and the external teeth 43a are separated from the internal teeth 23 of the ratchet 21. The second cam 45 is formed in a shape that pulls up.

  On the inner wall surface of the ratchet 21 on the bottom surface side of the circular recess 21a from the inner teeth 23, a pair of protrusions 51 projecting toward the center of the circumference along the circumferential direction are provided on the circumference of the circumference. It is formed at a point-symmetrical position with respect to the center. Each second cam 45 is formed with a protrusion 45f that can ride on the top of the protrusion 51 in the protruding direction. When the protrusion 45f of the second cam 45 rides on, the protruding amount of the protruding portion 51 is set to an amount that holds the pole 41 and the pole 43 at a position where the outer teeth 41a and the outer teeth 43a are separated from the inner teeth 23 of the ratchet 21. ing. When the protrusion 45f of the second cam 45 rides on the protrusion 51, the first cam 31 rotates in one direction (the pole 41, the external teeth 41a of the pole 43, and the external teeth 43a on the internal teeth 23 of the ratchet 21). Rotation in the meshing direction) is prohibited, and a “lock-free state” is achieved in which the ratchet 21 and the base plate 25 can be rotated relative to each other without operating the first cam 31.

  Further, in this embodiment, when the ratchet 21 and the base plate 25 are rotated relative to each other with the outer teeth 43a of the pole 43 meshing with the inner teeth 23 of the ratchet 21, the force acting on the second cam 45 from the pole 43 Is directed to a contact portion between the second cam projection 31e of the first cam 31 and the second cam 45.

  Similarly, when the ratchet 21 and the base plate 25 are rotated relative to each other while the outer teeth 41a of the pole 41 are engaged with the inner teeth 23 of the ratchet 21, the force acting on the second cam 45 from the pole 41 is the first cam. The second cam projection 31e of 31 and the second cam 45 are in contact with each other.

  Next, the operation of the above configuration will be described.

  Usually, the external teeth 41a of the poles 41 on the base plate 25 side and the external teeth 43a of the poles 43 on the side of the base plate 25 are connected to the ratchet 21 through the first cam 31, the release plate 33, and the second cams 45 by the biasing force of the spiral spring 47. At the lock position meshed with the internal teeth 23, the relative rotation between the ratchet 21 and the base plate 25 is prohibited, and the seat back cannot rotate relative to the seat cushion (locked state).

  When the first cam 31 is operated against the biasing force of the spring 47 and rotated in the other direction, the release plate 33 that rotates together with the first cam 31 rotates, and the external teeth 41a and the external teeth 43a are ratchet. Each pole 41, each pole 43, and each second cam 45 are pulled up in a direction away from the internal teeth 23 of the 21. Each pole 41, each pole 43, and each second cam 45 are ratchet with the external teeth 41a, the external teeth 43a. 21 moves to the unlocked position where the engagement with the internal teeth 23 is released, the ratchet 21 and the base plate 25 can be rotated relative to each other (unlocked), and the seat back 3 rotates relative to the seat cushion 2. It becomes possible.

  When the operating force on the first cam 31 is released, the urging force of the spiral spring 47 causes the pole 41 provided on the base plate 25, the external teeth 43a of the pole 43, and the external teeth 43a to mesh with the internal teeth 23 of the ratchet 21. The relative rotation between the ratchet 21 and the base plate 25 is prohibited and the locked state is established again.

  When the seat back 3 is rotated with respect to the seat cushion 2 (the ratchet 21 and the base plate 25 are relatively rotated) in the unlocked state, and the protrusions 45f of the second cams 45 reach the protrusions 51, Even when the operating force on the first cam 31 is released, the protrusion 45f of the second cam 45 rides on the protrusion 51, and all the poles 41 and the poles 43 are held in the unlocked state via the release plate 33. “Lock free state”.

  When the seat back 3 is rotated with respect to the seat cushion 2 in the lock-free state and the projections 45f of the second cams 45 are disengaged from the projections 51, the first cams 31, The external teeth 41a of the poles 41 on the base plate 25 side and the external teeth 43a of the poles 43 on the base plate 25 side are engaged with the internal teeth 23 of the ratchet 21 via the release plate 33 and the second cams 45 to return to the locked state.

  According to this embodiment, each pole 41 and each pole 43 simultaneously return to the locked state. Therefore, a large locking force is instantly generated.

  The present invention is not limited to the above embodiment. In the above embodiment, the two second cams 45 are used, but two poles may be driven by one second cam, and the other poles may be driven by the first cam. Even in this case, the two poles simultaneously return to the locked state, so that a large locking force is instantaneously generated.

  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.

  Furthermore, in the above embodiment, the pole 41 is linearly moved in the radial direction of the circumference by being guided by the first protrusion 35 and the third protrusion 39 and the pole 43 is guided by the first protrusion 35 and the second protrusion 37. However, the present invention can also be applied to a reclining device configured as shown in FIG. FIG. 8 is a view for explaining another embodiment, and is a view of the ratchet as seen from the base plate side with the base plate removed.

  In the figure, an internal tooth 107 is formed along a circumferential direction of relative rotation on a ratchet 105 provided so as to be relatively rotatable with a base plate (not shown).

  The four poles 101 are provided so as to be rotatable around a projecting portion 103 whose cross-sectional shape provided on a base plate (not shown) has a substantially meniscus shape. External teeth 109 that can mesh with the internal teeth 107 are formed on the surface side of the pole 101 facing the internal teeth 107 of the ratchet 105 on one rotating end side. Further, a protrusion 101 a is formed on a surface opposite to the surface facing the inner teeth 107 of the ratchet 105 on the other rotating end side of the pole 101.

  The base plate sandwiches both side surfaces of each pole 101 and serves as a guide for guiding each pole 101 between a locked position where the outer teeth 109 are engaged with the inner teeth 107 and an unlocked position where the outer teeth 109 are separated from the inner teeth 107. The protruding portion 111 and the protruding portion 113 are formed.

  A shaft 114 rotatably supported by the ratchet 105 is provided on an axis of relative rotation between the base plate and the ratchet 105. Between the base plate and the ratchet 105, there is provided a first cam 115 that is fixed to the shaft 114 and rotates together with the shaft 114. Protrusions 115a and 115b with which the surface opposite to the surface on which the external teeth 109 of the pole 101 are formed (hereinafter referred to as the back surface) can be formed on the peripheral portion of the first cam 115. In the drawing, when the first cam 115 rotates counterclockwise, the projections 115a and 115b push the projection 101a of the pole 101, and the pole 101 is rotated in the direction in which the outer teeth 109 are separated from the inner teeth 107.

  On the other hand, two second cams 117 are arranged so as to straddle two adjacent poles 101. When the first cam 115 rotates in the clockwise direction in the drawing, the second cam 117 is pushed, and the second cam 117 pushes the surface opposite to the surface on which the external teeth 109 of the two poles 101 are provided. The pole 101 is rotated in a direction in which 109 meshes with the internal teeth 107. Further, in this embodiment, the surface of the pole 101 with which the second cam 117 abuts is pressed against the force by which the outer teeth 109 engage with the inner teeth 107 of the ratchet 105 and the pole 101 is pushed by the protruding portion 111. It is a slope where force is generated.

  That is, in this embodiment, of the pressing contact between the second cam 117 and the two poles 101, the pressing contact between the second cam 1117 and one of the poles 101 is the clockwise side when viewed from the base plate (second member). The pole 101 is moved to the surface of the projecting portion 111, and the other cam 101 and the other pole 101 are pressed against each other, so that the pole 101 moves to the surface of the projecting portion 111 on the counterclockwise side when viewed from the base plate. Is moving.

  The ratchet 105 is formed with a pair of protrusions 121 that protrude toward the center of the circumference along the circumferential direction at positions that are point-symmetric with respect to the center of the circumference. Each second cam 117 is formed with a protrusion 117a that can ride on the top of the protrusion 121 in the protruding direction. The protrusion amount of the protrusion 121 is set to an amount that holds the pole 101 at a position where the outer teeth 109 are separated from the inner teeth 107 of the ratchet 105 when the protrusion 117a of the second cam 117 rides on.

21 Ratchet (first member)
23 Internal teeth 25 Base plate (second member)
31 1st cam 35, 37 1st guide 35, 39 1st guide 41, 43 Pole 41a, 43a External tooth 45 2nd cam 45e Protrusion 47 Spiral spring (biasing means)
51 protrusion

Claims (2)

A first member formed with internal teeth along the circumferential direction;
A plurality of poles having external teeth meshable with the internal teeth;
A lock position that is provided so as to be rotatable relative to the first member in the circumferential direction, sandwiches both side surfaces of each pole, and the outer teeth engage with the inner teeth, and the outer teeth are separated from the inner teeth. A second member formed with a guide for guiding each of the poles between locked positions;
In the reclining device in which relative rotation between the first member and the second member is prohibited by meshing the outer teeth with the inner teeth of the first member,
A protrusion protruding toward the center of the circumference along the circumferential direction of the first member;
A first cam disposed between the first member and the second member and rotatable on a rotation shaft of the relative rotation;
The first cam is disposed between at least two of the plurality of poles, and when pressed by the first cam, presses against a surface opposite to the surface on which the external teeth of the pole are provided. A second cam having a protrusion formed on the top of the protrusion in the protruding direction, the pole being moved in a direction in which the outer teeth mesh with the inner teeth,
Biasing means for biasing the pole in a direction in which the outer teeth mesh with the inner teeth;
Provided,
When the projection of the second cam rides on the top of the projection of the first member, all the external teeth hold each pole at a position away from the internal teeth. 2. The reclining device according to claim 1, wherein the pawl having the second cam disposed therebetween is pressed against the lock position only by the second cam.

Images