JP2011010665A - Knuckle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a knuckle device capable of holding lock strength and extending an operation range by a simple configuration, and also capable of easily coping even with the change of the operation range.SOLUTION: In the knuckle device provided with a plurality of lock plates 6, by attaching a first plate body 8A and a second plate body 8B respectively to only the two of one lock plate 6 and another lock plate 6 disposed in the state of facing each other among the plurality of lock plates 6 and making the engaging projection part 81 of the first plate body 8A and the engaging projection part 81 of the second plate body 8B correspond to the large diameter peripheral wall part 31 or small diameter peripheral wall part 32 of a guide wall 30 provided on a second case body 3 respectively, an operation range is stipulated. Thus, the operation range is maintained even when the arrangement number of the lock plates 6 is increased. As a result, holding of the lock strength stipulated by the engaging force of the lock plates 6 and holding of the operation range by the reduction of the number of the engaging projection parts 81 to be engaged with the guide wall 30 are compatibly achieved.

Description

  The present invention relates to a knuckle device for connecting a seat back to a seat cushion so as to be reclining.

  In the knuckle device, a request to maintain the lock strength from the viewpoint of ensuring safety (that is, the strength to hold the seat cushion at a predetermined tilt position), and the operation range from the viewpoint of ensuring operability and convenience are expanded. In other words, there is a demand for an expansion of both the angle range that can be set to the locked state and the angle range that can maintain the lock-free state when the locked state is released.

  For example, as disclosed in Patent Document 1, a lock state is formed by meshing an annular internal tooth provided on one arm with an external tooth of a pole provided on the other arm. If the arm on the side where the pole is provided is provided with a contact portion for preventing the external teeth of the pole from meshing with the internal teeth and forming a lock-free state, the internal teeth As a result, the angular range in which the external teeth of the pole can be set in a locked state is limited to an angular range obtained by dividing the entire circumference (360 °) of the internal teeth by the number of poles. This is because, in particular, when the number of poles is increased in order to ensure the locking strength, there is a conflicting problem that the angle range is further reduced.

  As one method for solving such a problem, one disclosed in Patent Document 2 is known. What is shown in this Patent Document 2 is that a protrusion that engages a contact portion that prevents external teeth provided on a pole from meshing with internal teeth is not provided on all of the plurality of poles. If the number of poles is three, only one of them will be provided. If the number of poles is four, only two of them will be provided. It is intended to increase the operating range by reducing the number of poles provided with the protrusion and the number of poles provided with the protrusions.

JP-A-9-183327 Japanese Patent Laid-Open No. 2003-9978

However, in what is shown in Patent Document 2, because the protrusion is provided on the pole, which engages the contact portion and prevents the external teeth of the pole from meshing with the internal teeth.
(A) The pole is provided with a cam slot to drive it forward and backward, but since the projection is provided together with the cam slot, the structure of the pole becomes complicated, resulting in an increase in cost.
(B) The formation width of the protrusion is limited to the width of the pole at the maximum. Therefore, the angle range that can be set to the locked state and the angle range that can maintain the lock-free state are the same as those of the contact portion provided on the arm side. It can be set only in the width dimension, for example, if it is attempted to change the setting, it is necessary to replace the arm itself, and it is difficult to cope with it.
There was a problem such as.

  Accordingly, the present invention has been made for the purpose of providing a knuckle device that can maintain the lock strength and expand the operating range with a simple configuration and can easily cope with a change in the operating range. Is.

  In the present invention, the following configuration is adopted as a specific means for solving such a problem.

  In the first invention of the present application, the first case body 3 attached to either the seat cushion 11 or the seat back 12 and the first case body 2 attached to either the seat cushion 11 or the seat back 12 are described. And a guide wall 30 comprising an annular inner tooth 34, a large-diameter outer peripheral wall portion 31 and a small-diameter inner peripheral wall portion 32 on the inner surface side thereof. 3 and a plurality of external teeth 61 that are arranged on the first case body 2 so as to be able to advance and retract in the radial direction and that can be engaged with the internal teeth 34 of the second case body 3 on the outer end surface thereof. A lock plate 6, a cam plate 5 that constantly biases the plurality of lock plates 6 in a protruding direction by a cam action, and a pivot that is disposed through the center positions of the first case body 2 and the second case body 3. By operation The operation shaft 1 for releasing the biasing action of the cam plate 5 against the lock plate 6 and a plurality of engagement holes 71 into which the protrusions 62 provided on the lock plate 6 are engaged are provided. The engaging hole 71 is engaged with the protrusion 62 by a turning operation, and the lock plate 6 is pulled inward in the radial direction, so that the external teeth 61 and the internal teeth 34 of the second case body 3 are engaged. In the knuckle device configured to include the guide plate 7 to be released, a protrusion engaging hole 82 into which the protrusion 62 provided in the lock plate 6 is engaged, and a guide wall provided in the second case body 3 The first plate body 8A and the second plate body 8B each provided with an engagement protrusion 81 that engages with the first plate body 8A, and the first plate body 8A is inserted into the protrusion engagement holes 82 of the plurality of lock plates 6. Set on one lock plate 6 The protrusion 62 is engaged, and the engaging protrusion 81 is disposed so as to face the guide wall 30 of the second case body 3, and the second plate body 8B is inserted into the protrusion engaging hole 82. The protrusion 62 provided on the other lock plate 6 disposed so as to face the one lock plate 6 is engaged, and the engaging protrusion 81 is engaged with the guide wall 30 of the second case body 3. It is characterized by the fact that it has been placed.

  In the second invention of the present application, in the knuckle device according to the first invention, the first plate body 8A and the second plate body 8B are assembled so as to be relatively movable in the radial direction of the second case body 3. It is characterized by that.

  In the present invention, the following effects can be obtained.

  (A) According to the knuckle device according to the first invention of the present application, the knuckle device includes a plurality of lock plates 6. Among the plurality of lock plates 6, one lock plate 6 disposed in an opposed state and the other lock plate 6. The first plate body 8A and the second plate body 8B are attached to only two of the plates 6, respectively, and the engagement protrusion 81 of the first plate body 8A and the engagement protrusion 81 of the second plate body 8B are attached, Since the operation range is defined by corresponding to the outer peripheral wall portion 31 or the inner peripheral wall portion 32 of the guide wall 30 provided in the second case body 3, respectively, the number of the lock plates 6 arranged is increased. However, the operation range can be maintained, and as a result, the lock strength defined by the engagement force of the lock plate 6 is maintained, and the number of the engaging protrusions 81 engaged with the guide wall 30 is reduced. Maintaining the operating range It is possible to achieve both.

  Further, since the lock plate 6 is provided with only the protrusion 62, for example, as described in Patent Document 2, a cam slot and a protrusion are formed on a pole (corresponding to the lock plate 6 of the present invention). Compared with the case where both are provided, the configuration of the lock plate 6 is simplified, and the cost can be reduced.

  Further, since the engaging projections 81 of the first plate body 8A and the second plate body 8B correspond to the large-diameter peripheral wall portion 31 or the small-diameter peripheral wall portion 32 of the guide wall 30, for example, the guide It is possible to change and set the operation range by changing the width dimension of each engagement protrusion 81 while maintaining the configuration of the wall 30, for example, as shown in Patent Document 2, Compared to the case where it is necessary to change and set the operating range by replacing the arm provided with the abutting part with another arm with a different width dimension of the corresponding contacting part, the operating range can be easily and inexpensively set. This can be realized and the versatility of the knuckle device is improved.

  (B) According to the knuckle device according to the second invention of the present application, the following specific effects can be obtained in addition to the effects described in (a) above. That is, in this invention, since the first plate body 8A and the second plate body 8B are assembled so as to be relatively movable in the radial direction of the second case body 3, for example, by the cooperation of both of them. For example, when the first plate body 8A and the second plate body 8B are individually assembled to provide a rotation prevention function and a radial movement function, respectively. As compared with the structure, the structure is simplified and the cost reduction is further promoted.

1 is a longitudinal sectional view of a knuckle device according to an embodiment of the present invention. It is a disassembled perspective view of the knuckle apparatus shown in FIG. It is the III-III arrow directional view in the locked state of the knuckle apparatus shown in FIG. It is an IV-IV arrow line view in the locked state of the knuckle device shown in FIG. It is a VV arrow line view in the lock state of the knuckle device shown in FIG. It is VI-VI arrow line view in the locked state of the knuckle apparatus shown in FIG. It is the III-III arrow directional view in the free state of the knuckle device shown in FIG. It is the IV-IV arrow line view in the free state of the knuckle apparatus shown in FIG. It is the VV arrow directional view in the free state of the knuckle apparatus shown in FIG.

  Hereinafter, the present invention will be specifically described based on preferred embodiments.

  FIG. 1 shows a cross-sectional structure of a knuckle device Z according to an embodiment of the present invention, and FIG. 2 shows an exploded view of components of the knuckle device Z.

A: Configuration of Knuckle Device Z The knuckle device Z connects the seat cushion 11 and the seat back 12 (in FIG. 1, the frame portions of the seat cushion 11 and the seat back 12 are shown), and the seat back 12 is provided so as to be able to recline with respect to the seat back 12, and is provided with an operation shaft 1 that is rotated by an operation of an operation lever 13 to release the locked state of the knuckle device Z. Then, the first case body 2 and the second case body 3 described below are abuttingly disposed in the state described below in a state where the operation shaft 1 is penetrated, and the first case body 2 and the second case body 3 are also disposed. Between them, a spring body 4, a lock plate 6, a guide plate 7 and a control plate 8, which will be described later, are respectively housed and arranged to form the knuckle device Z. The operation shaft 1 includes a rectangular portion 10 and a handle 13 is attached to one end thereof.

  The first case body 2 is integrally formed of a shallow dish-shaped disk body, the frame of the seat cushion 11 is fixed to the outer surface side thereof, and rotates around the operation shaft 1 integrally with the seat cushion 11. 4 guide grooves extending on the inner surface side of the shaft center position (the center of the shaft hole 22 through which the operation shaft 1 is disposed) to each of four orthogonal directions with a predetermined width. 21 is provided.

  The second case body 3 is integrally formed of a shallow dish-shaped disk body, and the frame of the seat back 12 is fixed to the outer surface side thereof, and rotates around the operation shaft 1 integrally with the seat back 12. An inner tooth 34 is formed on the inner surface of the peripheral wall over the entire circumference, and a guide wall 30 is formed on the inner surface of the side wall and on the inner diameter side of the inner tooth 34. . The guide wall 30 is configured by an arc-shaped wall surface having a predetermined height in the axial direction of the second case body 3, and as shown in FIG. 6, an outer peripheral wall portion 31 configured by a large-diameter arc-shaped wall and a small-diameter wall surface. The inner peripheral wall portion 32 composed of arcuate walls is disposed so that the pair of outer peripheral wall portions 31 and the pair of inner peripheral wall portions 32 face each other in the radial direction with the axis of the second case body 3 interposed therebetween. Has been. In this embodiment, the angle of formation of the outer peripheral wall portion 31 and the inner peripheral wall portion 32 is set to be about 90 °.

  The spring body 4 is configured by winding a leaf spring into a cylindrical shape, and is fitted and disposed in the shaft hole 22 of the first case body 2, and an outer peripheral end thereof is on the shaft hole 22 side. The hook is fixed. Further, the rectangular portion 10 of the operation shaft 1 is fitted and fitted to the inner peripheral side of the spring body 4. And it is assembled | attached between the said swivel base 2 and the said operating shaft 1 so that predetermined | prescribed urging | biasing force may be always generate | occur | produced in the arrow L direction.

  The cam plate 5 is formed of a substantially rectangular plate material having a rectangular hole 53 having a size that can be fitted into the rectangular portion 10 of the operation shaft 1, and a cam surface 51 is formed on each of the four apexes. Yes. Engaging pins 52 project from the rectangular holes 53 of the cam plate 5 so as to correspond to the vertices of the rectangular holes 53.

  The lock plate 6 is integrally formed of a substantially rectangular plate material, and the width dimension thereof is set to a size that fits slidably into the guide groove 21 of the first case body 2. The lock plate 6 is formed with external teeth 61 that can be engaged with the internal teeth 34 of the second case body 3 at one end surface thereof, and with the cam surface 51 of the cam plate 5 at the other end surface. A possible cam surface 63 is formed. Further, a protrusion 62 is provided on one surface of the lock plate 6 in the thickness direction. The four lock plates 6 are used as a set, and each of the four lock plates 6 has the outer teeth 61 in the radial direction in the guide grooves 21 of the first case body 2. It is attached in a state of facing outward (see FIG. 3).

  The guide plate 7 rotates integrally with the cam plate 5 to allow the lock plates 6 to move radially outward, while pulling the lock plates 6 radially inward. It functions and is integrally formed of a disc body. A rectangular engagement hole 72 is formed at the center position of the guide plate 7, and each 52 of the first mast 5 is engaged with each apex portion of the engagement hole 72. The plate 7 rotates integrally with the cam plate 5. Further, four guide holes 71 are formed at equal pitches in the circumferential direction at the outer peripheral portion of the guide plate 7.

  As shown in FIG. 4, the guide hole 71 is engaged with the protrusion 62 of the lock plate 6 by engaging the outer peripheral wall surface with the rotation of the guide plate 7. An arcuate guide surface 71a extending in an arc around the center of the guide plate 7 and extending in an inclined manner so as to gradually move radially inward continuously to one end of the arcuate guide surface 71a. An inclined guide surface 71b is formed.

  The control plate 8 is for defining a locked state and a lock-free state, and has a two-part configuration of a first plate body 8A and a second plate body 8B described below. The first plate body 8A and the second plate body 8B are members having the same shape, and are arranged and used in a point target state obtained by rotating the first plate body 180A by 180 °. The structure will be described taking the first plate 8A as an example.

  The first plate body 8A is integrally formed of a substantially semicircular arc-shaped plate material, and is a protrusion engaging with the protrusion 62 provided on the lock plate 6 at an intermediate position in the arcuate direction. A joint hole 82 is provided, and a protrusion-like engagement protrusion 81 is formed at a radially outer portion of the protrusion engagement hole 82 in a state of extending outward in the radial direction by a predetermined dimension from the arc-shaped outer peripheral surface. ing. Note that the width dimension of the engagement protrusion 81 can be changed and set as necessary. Accordingly, for example, several types of first plate bodies 8A having different width dimensions of the engagement protrusion 81 are prepared. It is possible to select and use this.

  Further, the first plate body 8A is provided with a straight protrusion-like fitting protrusion 83 at one end in the circumferential direction and a straight groove-like fitting groove 84 at the other end in the circumferential direction. In this case, the axial directions of the fitting protrusions 83 and the fitting grooves 84 are parallel to a center position in the width direction of the protrusion engaging hole 82 and a straight line passing through the center of curvature of the first plate body 8A. Set to direction.

  As shown in FIG. 5, the first plate body 8A and the second plate body 8B are arranged in a point target state rotated by 180 °, and any of the first plate body 8A and the second plate body 8B is arranged. One of the fitting protrusions 83 is inserted into one of the other fitting grooves 84, and the other fitting protrusion 83 is inserted into one of the fitting grooves 84. Therefore, the first plate body 8A and the second plate body 8B are separated from each other by the guide action of the fitting projection piece 83 and the fitting groove 84 which are fitted to each other (shown in FIG. 5). Position) and a second position (position shown in FIG. 9) where both of them approach each other.

  Here, the assembled state of each of the constituent members will be described.

  The operating shaft 1 is fitted and inserted into the shaft hole 22 of the first case body 2 from the outside, and the spring body 4 is fitted and fixed to the rectangular portion 10 portion of the rotating shaft 1. Further, the cam plate 5 is attached to the operation shaft 1 by fitting a portion of the operation shaft 1 extending inward from the spring body 4 of the rectangular portion 10 into the rectangular hole 53 of the cam plate 5. It is done.

  On the other hand, the lock plate 6 is fitted in each of the guide grooves 21 of the first case body 2 with the external teeth 61 facing outward in the radial direction and the protrusions 62 facing forward. . Therefore, in this state, each cam surface 51 of the cam plate 5 can be brought into contact with the cam surface 63 of each lock plate 6.

  Next, the guide plate 7 is attached so as to cover the cam plate 5 and the lock plates 6. In this case, the respective engagement pins 52 of the cam plate 5 are fitted into the corners of the engagement holes 72 of the guide plate 7 so that the guide plate 7 is integrated with the cam plate 5 in the rotation direction. . The protrusions 62 of the lock plates 6 engage with the guide holes 71 provided in the guide plate 7 and protrude on the surface of the guide plate 7.

  Next, the first plate 8A and the second plate 8B of the control plate 8 are assembled. The first plate body 8A has the protrusion engaging hole 82 inserted through the protrusion 62 of the one lock plate 6 protruding forward from any one of the four guide holes 71 of the guide plate 7. Assemble in the state. The second plate 8B is located on the opposite side of the guide hole 71 corresponding to the first plate 8A across the center of the guide plate 7 among the four guide holes 71 of the guide plate 7. In the state where the projection engaging hole 82 is inserted into the projection 62 of the other lock plate 6 projecting from the guide hole 71 to the front side. Then, in the assembled state of the first plate body 8A and the second plate body 8B, the fitting projection piece 83 and the fitting groove 84 of both are fitted.

  Finally, the second case body 3 is fitted to the first case body 2 from the outside of the control plate 8. In this state, the external teeth 61 of the lock plates 6 are arranged to face each other so as to engage with the internal teeth 34 of the first case body 2. Further, the engaging protrusion 81 of the first plate 8 </ b> A and the engaging protrusion 81 of the second plate 8 </ b> B of the control plate 8 correspond to the guide wall 30 of the first case body 2.

B: Operation of Knuckle Device Z Here, the operation of the knuckle device Z will be described.

  3 to 5 show the locked state of the knuckle device Z. FIG. That is, when the operation shaft 1 is not operated, the cam plate 5 is urged in the direction indicated by the arrow L in FIG. 2 by the urging force of the spring body 4, and the cam surface 51 of the cam plate 5 is The lock plate 6 is in contact with the cam surface 63, the lock plate 6 protrudes radially outward by the biasing force, and the outer teeth 61 are engaged with the inner teeth 34. At this time, as shown in FIG. 5, the engagement projection 81 of the first plate 8A and the engagement projection 81 of the second plate 8B of the control plate 8 are both on the second case body 3 side. Corresponding to the outer peripheral wall portion 31 of the guide wall 30, the engagement action of the lock plates 6 with the inner teeth 34 is not restricted at all, and the locked state of the knuckle device Z is maintained. The

  This locked state is realized by the fact that all of the four lock plates 6 are engaged with the internal teeth 34, so that high lock strength is ensured.

  In the knuckle device Z, the engagement protrusion 81 of the first plate 8A and the engagement protrusion 81 of the second plate 8B are within the circumferential range of the outer peripheral wall 31 of the guide wall 30. For example, the external teeth 61 of the lock plates 6 can mesh with the internal teeth 34. That is, in this embodiment, the locked state can be formed at any position in the angle range of about 90 °. In other words, the reclining adjustment angle of the seat back 12 (that is, the operating range of the lock) is about 90 °.

  The operating range of the lock can be adjusted by increasing / decreasing the formation range of the outer peripheral wall portion 31 in the guide wall 30. In addition, the engagement protrusion of the first plate body 8A of the control plate 8 can be adjusted. It can also be adjusted by increasing or decreasing the width dimension of the engaging projection 81 of the portion 81 and the second plate body 8B. In the former case, the shape of the second case body 3 is changed, which is disadvantageous in terms of cost. However, in the latter case, the guide plate 7 is an inexpensive configuration made of a plate material. Therefore, even if the engagement protrusion 81 having a different width dimension is prepared, this can be realized at a relatively low cost, which is advantageous in terms of cost.

  On the other hand, in the locked state shown in FIGS. 3 to 5, the operation shaft 1 is rotated in the direction of the arrow R shown in FIG. 3 against the urging force of the spring body 4 by the operation of the handle 13. Then, the locked state is released. That is, when the handle 13 is rotated against the urging force of the spring body 4, the cam plate 5 and the guide plate 7 are integrated with the operation shaft 1 as shown in FIGS. Is rotated in the direction of the arrow R, and the pressing action of the cam plate 5 on the lock plates 6 in the radially outward direction is released, and at the same time, the protrusions 62 of the lock plates 6 are guided by the guide plates 7. The hole 71 relatively moves from the arcuate guide surface 71a side to the inclined guide surface 71b side, and is drawn inward in the radial direction by the inclined guide surface 71b. As a result, the outer teeth 61 of the lock plate 6 are separated from the inner teeth 34, and the locked state realized by the outer teeth 61 meshing with the inner teeth 34 is released.

  In the unlocked state, the seat back 12 can be reclined freely. In this case, as shown in FIG. If the engaging protrusion 81 of the first plate 8A and the engaging protrusion 81 of the second plate 8B correspond to the inner peripheral wall 32 of the guide wall 30, even if the operation on the handle 13 is canceled at this time point The engagement projection 81 of the first plate 8A and the engagement projection 81 of the second plate 8B are both engaged with the inner peripheral wall 32 and prevented from moving further radially outward. One lock plate 6 and the other lock plate 6 in which the protrusions 62 are fitted in the protrusion engaging holes 82 of the first plate body 8A and the second plate body 8B have both outer teeth 61. Keeping away from the internal teeth 34. It is. Further, since the protrusions 62 of these lock plates 6 are connected via the guide plate 7, the lock teeth 6 are also held in a state where the outer teeth 61 are separated from the inner teeth 34. The As a result, even when the operation on the handle 13 is released, the locked state is maintained, that is, the lock-free state is realized. Therefore, it is possible to recline the seat back 12 as it is.

  Here, the lock-free state is within an angular range in which the engagement protrusion 81 of the first plate 8A and the engagement protrusion 81 of the second plate 8B are both engaged with the inner peripheral wall 32. If the angle range is deviated, the engagement is released, and the engagement protrusion 81 of the first plate 8A and the engagement protrusion 81 of the second plate 8B are both in the inner peripheral wall 32. Since the guide plate 7 moves to the outer peripheral wall portion 31 side, the action of preventing the movement of each lock plate 6 in the radial direction by the guide plate 7 is eliminated, and each lock plate 6 receives the biasing force of the spring body 4 and The cam plate 5 moves outward in the radial direction by the cam action, and the outer teeth 61 mesh with the inner teeth 34 to be locked again.

  Thus, the lock-free state of the knuckle device Z is defined by the circumferential length of the inner peripheral wall portion 32 of the guide wall 30. In this embodiment, an operating range of about 90 ° is ensured. . The operating range of about 90 ° is provided with the four lock plates 6, but only the two lock plates 6 are provided with the first plate body 8A and the second plate body 8B. Correspondingly, it is achieved by providing two inner peripheral wall portions 32.

As described above, according to the knuckle device Z of this embodiment, a plurality of lock plates 6 are provided. Among the plurality of lock plates 6, one lock plate 6 arranged in an opposing state. The first plate body 8A and the second plate body 8B are attached to only two of the lock plate 6 and the other lock plate 6, respectively, and the engagement protrusion 81 of the first plate body 8A and the engagement protrusion of the second plate body 8B. The portion 81 is made to correspond to the large-diameter peripheral wall portion 31 or the small-diameter peripheral wall portion 32 of the guide wall 30 provided in the second case body 3, respectively. Since the state setting range is defined, the operation range can be maintained even when the number of the lock plates 6 is increased. As a result, the lock defined by the engagement force of the lock plate 6 can be maintained. The holding of the strength and the holding of the operating range by reducing the number of the engaging protrusions 81 that engage with the guide wall 30 can be made compatible, which is extremely useful in practice.

  In this case, since only the protrusion 62 is provided on the lock plate 6, the configuration of the lock plate 6 is simplified and the cost can be reduced.

  Further, since the engaging projections 81 of the first plate body 8A and the second plate body 8B correspond to the large-diameter peripheral wall portion 31 or the small-diameter peripheral wall portion 32 of the guide wall 30, for example, the guide It is possible to change and set the operation range by changing the width dimension of each engagement protrusion 81 while maintaining the configuration of the wall 30, for example, as shown in Patent Document 2, Compared to the case where it is necessary to change and set the operating range by replacing the arm provided with the abutting part with another arm with a different width dimension of the corresponding contacting part, the operating range can be easily and inexpensively set. This can be realized and the versatility of the knuckle device Z is improved.

  In addition, since the first plate body 8A and the second plate body 8B are assembled so as to be relatively movable in the radial direction of the second case body 3, for example, the rotation of the first plate body 8A and the second plate body 8B is achieved by the cooperation of both. Relative movement in the radial direction can be realized. For example, as compared with the case where the first plate body 8A and the second plate body 8B are individually assembled to have a rotation prevention function and a movement function in the radial direction, respectively. The structure is simplified and the cost reduction is further promoted.

DESCRIPTION OF SYMBOLS 1 ... Operation shaft 2 ... 1st case body 3 ... 2nd case body 4 ... Spring body 5 ... Cam plate 6 ... Lock plate 7 ... Guide plate 8 ... Control plate 11 ... Seat cushion 12 · · Seat back 21 · · Guide groove 30 · · Guide wall 31 · · Outer peripheral wall portion 32 · · Inner peripheral wall portion 33 · · Stepped portion 34 · · Inner teeth 51 · · Cam surface 52 · · Engaging pin 61 · · External teeth 62 .. Protrusion 63 .. Cam surface 71 .. Guide hole 72 .. Engagement hole 81 .. Engagement protrusion 82.

Claims (2)

A first case body (3) attached to either the seat cushion (11) or the seat back (12);
Attached to one of the seat cushion (11) and the seat back (12) and assembled so as to be relatively rotatable with respect to the first case body (2), an annular internal tooth (34 ), And a second case body (3) including a guide wall (30) composed of a large-diameter outer peripheral wall portion (31) and a small-diameter inner peripheral wall portion (32),
The first case body (2) is arranged so as to be able to advance and retreat in the radial direction, and external teeth (61) that can mesh with the internal teeth (34) of the second case body (3) are arranged on the outer end surface thereof. A plurality of lock plates (6) provided;
A cam plate (5) that constantly biases the plurality of lock plates (6) in a protruding direction by a cam action;
An operation of releasing the urging action of the cam plate (5) against the lock plate (6) by rotating operation arranged through the center position of the first case body (2) and the second case body (3). Axis (1),
A plurality of engagement holes (71) into which protrusions (62) provided on the lock plate (6) are engaged are provided, and the engagement holes (71) are protruded by rotating the operation shaft (1). (62) is engaged and the lock plate (6) is pulled radially inward to release the meshing state between the external teeth (61) and the internal teeth (34) of the second case body (3). A knuckle device comprising a guide plate (7),
The projection engaging hole (82) in which the projection (62) provided in the lock plate (6) is engaged, and the guide wall (30) provided in the second case body (3) are engaged. While having a first plate (8A) and a second plate (8B) provided with an engaging protrusion (81),
The first plate body (8A) engages the protrusion (62) provided on one lock plate (6) of the plurality of lock plates (6) in the protrusion engagement hole (82). The engaging protrusion (81) is arranged facing the guide wall (30) of the second case body (3),
The second plate (8B) has the protrusion (62) provided on the other lock plate (6) disposed in the protrusion engagement hole (82) so as to face the one lock plate (6). ), And the engaging protrusion (81) is arranged facing the guide wall (30) of the second case body (3). In claim 1,
The knuckle device, wherein the first plate body (8A) and the second plate body (8B) are assembled so as to be relatively movable in the radial direction of the second case body (3).

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