JP5251280B2 - Rotating hinge mechanism for vehicle seat - Google Patents

Description

  The present invention relates to a rotary hinge mechanism for a vehicle seat. Specifically, the present invention relates to a rotating hinge mechanism for a vehicle seat in which a rotating body is rotatably connected to a fixed body by a connecting shaft.

Conventionally, in a vehicle seat, when the rear impact of the vehicle occurs, the headrest is instantaneously moved forward to approach the seated person's head, thereby quickly preventing the head from tilting backward due to the impact of the rear impact of the vehicle. Some have been adopted. Here, the following Patent Document 1 discloses the configuration of the movable headrest device described above. In this disclosure, when a vehicle rear-end collision occurs and the movable part of the headrest approaches the head, the stopper that prevents the movable part from returning is functioned so that the movable part is in a position close to the head. It can be stopped.
JP 2007-106384 A

  In the related art disclosed above, for example, when the stopper is engaged with the movable portion by rotation to prevent return, the connecting shaft serving as the rotation center is not mistaken in the assembly direction of the stopper, and It is preferable to be assembled in a simply positioned state.

  The present invention has been devised as a solution to the above-described problems, and the problem to be solved by the present invention is to provide a rotating hinge mechanism for a vehicle seat in which the connecting shaft is attached to the rotating body. It is to be assembled in a state of being easily positioned so as not to make a mistake.

In order to solve the above problems, the rotating hinge mechanism for a vehicle seat according to the present invention takes the following means.
A first invention is a rotating hinge mechanism for a vehicle seat in which a rotating body is rotatably connected to a fixed body by a connecting shaft. When the connecting shaft is inserted into the rotating body to a position positioned in the axial direction, the connecting shaft is assembled with the end portions of the shaft projecting on both sides in the axial direction of the rotating body. Then, each end of the protruding shaft is inserted into the fixed body in a direction perpendicular to the axial direction so that the rotating body is supported rotatably with respect to the fixed body about the connecting shaft. It has become. The connecting shaft is formed with a protruding portion that protrudes radially outward in a part of the shaft shape that is inserted into the rotating body. When the connecting shaft is inserted into the rotating body from one side in the axial direction, the overhanging portion is received by a recess formed in a recess on one side surface in the axial direction of the rotating body. However, when the overhanging portion is inserted into the rotating body from the other side in the axial direction, the overhanging portion comes into contact with the side surface on the other side in the axial direction of the rotating body to prevent the insertion movement of the connecting shaft in the axial direction.

  According to the first aspect of the present invention, the connecting shaft is inserted into the rotating body from one side in the axial direction, so that the protruding portion is received in the recess formed on the side surface of the rotating body, and It is assembled in a normal state in which the end of the shaft protrudes from both sides. However, since the connecting shaft is inserted into the rotating body from the other side in the axial direction, the above-described overhanging portion comes into contact with the side surface of the rotating body, and the insertion movement to the normal insertion position is prevented. Assembled into the state. Thereby, the length of the edge part which protrudes from the side surface of the other side of the rotary body of the connection shaft will be in the state which excessively protruded. As described above, when the connecting shaft is inserted from the wrong direction, the connecting shaft is not fully inserted and is excessively projected and assembled, so that the connecting shaft is attached to the rotating body in the wrong direction. And can be assembled in a simply positioned state.

  Next, according to a second aspect of the present invention, in the first aspect described above, the rotary hinge mechanism for the vehicle seat is a movable headrest device that moves the headrest toward the seated person's head when a vehicle rear-end collision occurs. It has been incorporated. The headrest has a headrest body corresponding to a fixed body fixed to the seat back, and a movable body that is rotatably linked to the headrest body, and the head of the seated person is moved along with the rotational movement of the movable body. The supporting part to be received is moved to a collision corresponding position close to the head. The headrest body is connected to a stopper piece corresponding to a rotating body that engages with the movable body by rotation and stops the return rotation of the movable body to keep the support portion at the collision-corresponding position.

  According to the second aspect, when the connecting shaft is inserted into the stopper piece from the wrong direction side, the stopper piece is assembled at a position offset in the axial direction with respect to the connecting shaft. However, when the connecting shaft is inserted into the stopper piece from the correct direction side, the stopper piece is assembled in a normal state without being biased in the axial direction with respect to the connecting shaft. Therefore, the stopper piece can be reliably assembled to the headrest body at a normal position where the head load when the rear collision of the vehicle occurs can be firmly received.

  Next, according to a third aspect of the present invention, in the first or second aspect described above, when the rotating body is assembled to the fixed body in the reverse direction, the rotating shaft is abutted against the fixed body and the connecting shaft is inserted. A blocking portion is formed to block the above.

  According to the third aspect of the invention, since the rotating body cannot be assembled to the fixed body in the reverse direction with respect to the fixed body by the blocking portion, the rotating body can be prevented from being mounted in the reverse direction to the fixed body. .

  Embodiments of the best mode for carrying out the present invention will be described below with reference to the drawings. In the following embodiments, a configuration example in which the rotating hinge mechanism of the vehicle seat of the present invention is applied to the mechanism structure of the movable headrest device is shown.

  First, the configuration of the movable headrest device according to the first embodiment will be described with reference to FIGS. As shown in FIG. 1, in the movable headrest device, when the rear collision of the vehicle occurs, the support portion 2 of the headrest 1 that receives the head of the seated person moves forward and upward with respect to the headrest body 10. Thus, the operating structure is close to the head of the seated person. As a result, the movement of the head, which is normally in a state where the posture is lifted forward from the headrest 1, to tilt backward vigorously due to the impact of the rear impact, is prevented at an early stage.

  Here, the headrest 1 has two rod-like stays 4 and 4 integrally coupled and fixed to the headrest main body 10 inserted into and fixed to the upper surface portion of a seat back (not shown) as a backrest. Thus, the seat back is firmly supported. The headrest body 10 is configured such that the rear surface portion and the side surface portion are covered with the outside by a resin rear cover 3 fitted from the rear side.

  Hereinafter, the structure which operates the support part 2 to the front side at the time of the occurrence of a rear collision incorporated in the headrest 1 will be described with reference to FIGS. That is, as shown in FIG. 2, the headrest main body 10 is formed of a “U” -shaped steel plate whose both side portions are bent forward. As a result, the headrest body 10 is composed of a rear plate portion 11 with the plate surface facing the front side, and both side plate portions 12 and 12 projecting forward from both side portions of the rear plate portion 11. Yes.

  The upper portion of the center of the rear plate portion 11 is formed by being cut and raised to the front side in a double-opened manner, and a recessed portion 11a that opens to the front side at the cut-and-raised tip portion. , 11a are formed in a recess. Further, the rear plate portion 11 is formed by cutting and raising the center portion of the rear plate portion to the front side in a single-open shape, and a lower end of a later-described subspring S2 is formed on the lower surface portion of the cut and raised portion. A spring hook portion 11b for hooking is formed in a recess.

  And each side plate part 12 and 12 mentioned above is formed so that a mutual plate surface may face, and long holes 12a and 12a of the shape curved in the front and the upper part are those in the lower part illustration side, It is formed so as to penetrate each other. A thick plate-shaped movable body 20 made of resin is linked to the upper portions of the both side plate portions 12 and 12 in front of the drawing so as to be rotatable by a connecting shaft 20a. Here, the movable body 20 has a plate-shaped lateral width that fits between the side plate portions 12 and 12, and the connecting shaft 20 a extends from the side plate portions 12 and 12 to the edge on the upper end side in the figure. By being inserted through the width direction, it is linked to both side plate portions 12 and 12 so as to be rotatable.

  The movable body 20 has a resin ratchet that serves as a locking tooth on the central upper surface portion on the side that becomes the rear surface (back surface) when the movable body 20 is in a rotational posture depending on the connecting shaft 20a. 21 is integrally formed. Thereby, as shown in FIG. 8, the ratchet 21 is integrally moved with the movable body 20 so as to rotate around the connecting shaft 20a. Here, on the outer peripheral surface 21a of the ratchet 21, stepped portions 21b,..., Whose shapes are stepped down are formed, and are formed in a staircase shape in which the steps are stepped in the counterclockwise direction.

  Then, referring back to FIG. 2, a driven body 30 formed of a steel plate is linked to the edge of the movable body 20 on the lower end side in the figure so as to be rotatable by a connecting shaft 30a. Here, the driven body 30 is formed in a “U” -shaped shape by bending both side portions rearward, and the front plate portion 31 with the plate surface facing the front side, and both side portions of the front plate portion 31. It is comprised from the both-sides board parts 32 and 32 projected to the back side from. The follower 30 is assembled with the support portion 2 described above with reference to FIG. 1 on the front side thereof, and the support portion 2 is moved integrally as the follower 30 moves.

  The side plate portions 32 and 32 of the driven body 30 are formed so that their plate surfaces face each other, and the edge portion on the lower end side of the movable body 20 described above between the edge portions on the upper end side in the drawing. Are inserted in the width direction and penetrated through them, and the connecting shaft 30a is inserted in the width direction so as to be rotatably supported by the movable body 20. Further, each side plate portion 32, 32 of the driven body 30 is connected to a connecting shaft 30c in which the edge portion on the lower end side in the figure is inserted into the long holes 12a, 12a of the side plate portions 12, 12 of the headrest body 10. By being inserted, it is linked to the headrest body 10 so as to be rotatable and slidable.

  Accordingly, as shown in FIGS. 8 to 9, the follower 30 moves the connecting shaft 30 c described above into the long holes 12 a, along with the link motion in which the movable body 20 swings back and forth around the connecting shaft 30 a. While being slid within 12a, the whole moves forward and obliquely upward (see FIG. 9) and rearward and obliquely downward (see FIG. 8). Here, returning to FIG. 2, the connecting shaft 20a that links and connects the movable body 20 and the headrest body 10 described above, and the connecting shaft 30c that links and links the driven body 30 and the headrest body 10 to each other. The two main springs S1, S1 made of tension springs are hooked.

  The main springs S1 and S1 have their upper end portions shown in the figure hooked into slits 22 and 22 formed in the upper surface of the movable body 20, and are connected to a connecting shaft 20a passing through the slits 22 and 22. It is hung. And the site | part of the illustration lower end side of main spring S1, S1 is respectively hooked by the connection shaft 30c penetrated in the long holes 12a and 12a. As a result, the connecting shaft 30c is constantly urged by the urging force of the main springs S1 and S1 in the direction of moving in the elongated holes 12a and 12a toward the front upper end in the figure. .

  However, as shown in FIG. 8, the connecting shaft 30c is always engaged with a locking device (not shown) at the end position of the rear lower side of the long holes 12a, 12a before the rearward collision of the vehicle. It is held in a fixed state. As a result, the driven body 30 is normally held in a state of an initial posture drawn to the rear side. And thereby, the support part 2 assembled | attached to the driven body 30 is always hold | maintained in the state of the initial position shown by the continuous line of FIG.

  Returning to FIG. 8, the engagement lock state of the connecting shaft 30c by the lock device (not shown) described above is released when the vehicle rear collision occurs and the lock device is released. Here, as the operation structure of the locking device described above, an operation structure through cable operation as disclosed in Japanese Patent Application Laid-Open No. 2008-56089 is adopted. Specifically, when the rear collision of the vehicle occurs, the lock device is triggered by a backrest load that the seat back of the seated person presses against the seat back, and the locked state is released by cable operation.

  Therefore, by the operation of the locking device described above, the connecting shaft 30c is instantaneously moved to the front upper end positions of the long holes 12a and 12a by the strong biasing force of the main springs S1 and S1 with the occurrence of the rear collision of the vehicle. To do. As a result of this movement, as shown in FIG. 9, the follower 30 moves forward and upward in such a manner that the follower 30 is pushed up, and the support portion 2 is transferred to a collision-corresponding position close to the head of the seated person. It will be in the state.

  Therefore, when the rear collision of the vehicle occurs, the seated person's head is received by the support portion 2 that has moved close to the position immediately thereafter. At this time, the support portion 2 receives a pressing force that is pulled back downward against the urging of the main springs S1 and S1 due to the head load of the seated person received at the position corresponding to the collision. However, the pressing force applied to the support portion 2 is caused by the stopper piece 40 that engages with the stepped portion 21b formed on the ratchet 21 of the movable body 20 when the support portion 2 moves to the position corresponding to the collision. It is supposed to be accepted.

  Next, an engagement structure between the stopper piece 40 and the ratchet 21 will be described. Here, as shown in FIG. 2, the stopper piece 40 is formed in a plate shape with resin, and the edge portion on the front end side in the drawing is abutted against the stepped portion 21 b of the ratchet 21 to be engaged. It is formed as an engaging portion 41 that performs. As shown in FIG. 6, a connecting shaft 43 is inserted in the stopper piece 40 in the width direction, and the connecting shaft 43 is formed in each of the recesses 11a formed in the headrest body 10 described above. The stopper piece 40 is pivotally connected to the headrest main body 10 by being fitted into 11a.

  Here, at the edge of the stopper piece 40 on the rear end side in the figure, an operation portion 42 that is warped upward is formed. The operation portion 42 is configured as a portion that is gripped by an operator during an operation of removing the stopper piece 40 from the engaged state with the ratchet 21. And between this stopper piece 40 and the headrest main body 10, the subspring S2 which consists of a tension spring is hooked. As shown in FIG. 8, the upper end portion of the sub spring S <b> 2 is hooked on a spring hook portion 44 formed on a plate portion on the rear side of the connecting shaft 43 of the stopper piece 40, and the lower end portion is The spring rest 11b is formed on the headrest body 10 described above.

  Accordingly, the stopper piece 40 is normally urged to rotate in the clockwise direction in the figure around the connecting shaft 43 by the urging force of the sub spring S2, and the engaging portion 41 on the front end side thereof is the outer peripheral surface 21a of the ratchet 21. It is held in the posture state pressed against. The stopper piece 40 is moved along the outer peripheral surface 21a of the ratchet 21 in accordance with the movement in which the vehicle rearward collision occurs and the movable body 20 rotates in the clockwise direction in the figure around the connecting shaft 43 on the upper end side. It operates so that the steps of the step portions 21b.

  Therefore, even if the movable body 20 is subjected to a backward tilting load on the head portion 2 at an early stage in the course of the rotational movement and receives a force in the direction of being pushed back, the movable body 20 falls to its rotational position. When the stopper piece 40 is abutted against the portion 21b, the reverse rotation is prevented. Then, as shown in FIG. 9, the movable body 20 is moved in the clockwise direction of the drawing when the connecting shaft 30c in the long holes 12a and 12a reaches the front upper end of each of the long holes 12a and 12a. The rotational movement is stopped.

  As a result, the support portion 2 is held in a state of reaching the collision corresponding position close to the head of the seated person (see FIG. 1). As a result, as shown in FIG. 9, the movable body 20 has a stopper on the stepped portion 21 b that has fallen to the rotational position even if a backward tilting load is applied to the support portion 2 at the collision-corresponding position. When the piece 40 is abutted, the reverse rotation is held in a stopped state.

  The locking state of the stopper piece 40 locked to the stepped portion 21b of the ratchet 21 is operated by pulling up the operating portion 42 upward in the figure and operating the engaging portion 41 away from the stepped portion 21b. It is canceled by doing. Note that the operation of pulling up the operation portion 42 of the stopper piece 40 is locked by the stopper piece 40 coming into contact with the top surface cb of the through-hole 11c inserted by being assembled to the headrest body 10. .

  As a result, the state in which the reverse rotation of the movable body 20 is prevented is released. Therefore, the movable body 20 is pushed downward in the backward direction against the urging of the main springs S1 and S1, and the long holes 12a and 12a By moving the connecting shaft 30c to the position of the rear lower side of the long holes 12a, 12a, the connecting shaft 30c is engaged and locked with the locking device (not shown) described above, and the support portion 2 is pushed out to the collision corresponding position. The state is returned to the previous initial position and held.

  Returning to FIG. 2, the above-described assembly of the stopper piece 40 to the headrest body 10 is performed by the following simple assembly operation. Here, as shown in FIG. 4, the connecting shaft 43 is inserted and assembled in the axial direction with respect to the stopper piece 40, so that the end portions 43 a and 43 a of the shaft are on both sides of the stopper piece 40. The stopper piece 40 and the rotation direction are integrally assembled. Then, the end portions 43a and 43a protruding from the stopper piece 40 are fitted into the recesses 11a and 11a formed in the headrest body 10 so that the connecting shaft 43 is rotatably connected to the headrest body 10. Has been.

  Here, the connecting shaft 43 is formed in a vertically long cross-sectional shape. Specifically, as shown in FIG. 6, the connecting shaft 43 has a lateral diameter that matches the opening width of the receiving ports ah and ah of the recesses 11 a and 11 a and a circular inner peripheral surface of the recesses 11 a and 11 a. It is formed in a vertically long shape having a vertical diameter suitable for. Both end surfaces of the connecting shaft 43 in the longitudinal direction are formed in a curved arc shape that matches the inner circumferential surface of each concave portion 11a, 11a that is curved in a perfect circle.

  Accordingly, the connecting shaft 43 having the above-described configuration is inserted into the receiving ports ah, ah of the respective recesses 11a, 11a in the longitudinal direction of the cross section perpendicularly to the axial direction by inserting the respective end portions 43a, 43a. It will be in the state supported by 11a so that rotation was possible. Here, the connecting shaft 43 is assembled so that the longitudinal direction of the cross-sectional shape thereof faces the plate surface direction of the stopper piece 40.

  Specifically, as shown in FIG. 2, the stopper piece 40 is formed with a through hole 40 a having a vertically long hole shape that matches the cross-sectional shape of the connecting shaft 43 in the width direction. A recess 40b that is greatly recessed around the through hole 40a is formed on the side surface of the stopper piece 40 on the illustrated side. Here, the connecting shaft 43 is inserted into the through-hole 40a from the side surface side shown in the figure, and in the vicinity of the tail-side end 43a inserted at the end, A flange 43b protruding in a disk shape is formed on the radially outer side.

  As shown in FIG. 4, when the connecting shaft 43 is inserted into the through hole 40a of the stopper piece 40, the flange 43b abuts against the left side surface of the stopper piece 40 in the drawing to connect the connecting shaft 43. This is a functional surface for positioning the insertion position in the axial direction. A disc-shaped projecting portion 43c is formed at a location adjacent to the right side of the collar portion 43b in the figure and projects smaller than the collar portion 43b outward in the radial direction. As shown in the figure, the overhang portion 43c is inserted into the recess 40b formed on the side surface of the stopper piece 40 described above when the connecting shaft 43 is inserted into the through hole 40a of the stopper piece 40. It is designed to be accepted.

  However, as shown in FIG. 5, when the connecting shaft 43 is erroneously inserted from the right side of the stopper piece 40 as shown in FIG. At the same time, the insertion movement of the connecting shaft 43 in the axial direction is prevented. Accordingly, when the connecting shaft 43 is inserted into the stopper piece 40 from the wrong direction side as described above, the collar portion 43b is not inserted into the through hole 40a to a sufficient position, and the overhang portion 43b It is assembled in a state where it is floated by a thickness t of 43c.

  Therefore, as shown in FIG. 4, when the connecting shaft 43 is correctly assembled to the stopper piece 40, the stopper pieces 40 are assembled by assembling the end portions 43a, 43a of the connecting shaft 43 to the recesses 11a, 11a. Is assembled in a state of being fitted between the plate pieces in which the concave portions 11a and 11a are formed. However, as shown in FIG. 5, when the connecting shaft 43 is assembled to the stopper piece 40 from the wrong direction side, the end portions of the connecting shaft 43 are projected by overhanging the plate thickness dimension t of the overhanging portion 43 c of the connecting shaft 43. 43a and 43a cannot be assembled to the recesses 11a and 11a, indicating that the connecting shaft 43 is erroneously assembled to the stopper piece 40.

  Incidentally, as shown in FIG. 6, the receiving ports ah and ah of the recesses 11a and 11a for receiving the end portions 43a and 43a of the connecting shaft 43 described above are formed so as to open obliquely upward before the drawing. Each end 43a, 43a can be received from the front diagonally upper side. Therefore, the assembling operator grasps the plate portion on the tip end side where the engaging portion 41 of the stopper piece 40 is formed, and so on, so that the end portions 43a and 43a are inserted into the receiving ports of the concave portions 11a and 11a so as to thrust the plate. By inserting it into ah, ah, the stopper piece 40 can be easily assembled from the obliquely upper front side where the headrest body 10 is opened.

  At this time, when the stopper piece 40 is assembled to the headrest body 10, the operation part 42 extending to the rear side is inserted into the through-hole 11 c formed through the rear plate part 11 of the headrest body 10. The operation unit 42 is assembled in a state of protruding rearward from the through-hole 11c. Here, the operation part 42 of the stopper piece 40 is formed in a shape that is warped upward, and as shown in FIG. 7, the stopper piece 40 is assembled in the reverse direction (up and down). In addition, the bent corner portion abuts against the bottom surface ca of the through-hole 11c to prevent the connection shaft 43 from being inserted into the recesses 11a and 11a. Here, the operation unit 42 corresponds to a blocking unit of the present invention.

  Therefore, when the end portions 43a and 43a of the connecting shaft 43 are inserted into the recesses 11a and 11a with the stopper piece 40 facing upside down, the operation portion 42 and the bottom surface ca of the through-hole 11c described above are used. Due to the interference, the end portions 43a and 43a are in a state of being struck in the middle of entering into the recesses 11a and 11a. Thereby, it is shown that the stopper piece 40 is assembled in an incorrect state as the coupling shaft 43 is assembled in a non-rotatable state.

  Thus, when the connecting shaft 43 is inserted into the stopper piece 40 from the correct direction side, the stopper piece 40 is assembled in a normal state without being biased in the axial direction with respect to the connecting shaft 43. Therefore, the stopper piece 40 can be reliably assembled to the headrest body 10 at a normal position where the head load when the rearward collision of the vehicle occurs can be firmly received.

  Although the embodiment of the present invention has been described with respect to one example, the present invention can be implemented in various forms in addition to the above-described example. For example, referring to FIG. 4, the connecting shaft 43 is configured without the flange portion 43 b, and the protruding portion 43 c enters the concave portion 40 b so as to be positioned in the axial insertion position of the connecting shaft 43. It may be like this. In addition to the application to the movable headrest device shown in the above embodiment, the rotating hinge mechanism for a vehicle seat according to the present invention includes various mechanisms in which a rotating body is rotatably connected to a fixed body by a connecting shaft. Can be applied to the structure.

  Moreover, in the said Example, while the stopper piece which is a rotary body is integrally assembled | attached with the rotation direction with respect to a connection axis | shaft, this connection axis | shaft is rotatably assembled | attached to the headrest main body which is a fixed body. Exemplifies a configuration in which the headrest body is rotatably connected to the headrest body. However, the rotating body may be assembled so as to be rotatable with respect to the connecting shaft. However, in this case, in order to be able to rotate the rotating body with respect to the connecting shaft, the cross-sectional shape of the shaft of the connecting shaft and the hole shape of the through hole of the stopper piece are made into a perfect circle, Also, it is necessary to be able to be received rotatably with respect to the recess.

1 is an external perspective view of a movable headrest device according to a first embodiment. It is a disassembled perspective view showing the internal structure of a headrest. It is an assembly drawing of the internal structural components of a headrest. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3 showing an assembled state of the connecting shaft. It is sectional drawing showing the state in which the connecting shaft was assembled | attached from the wrong direction. It is an assembly process figure of a stopper piece. It is an assembly figure showing the state where the stopper piece was assembled in the reverse direction. It is a side view showing typically the initial state of a headrest device. It is a side view showing the state where the headrest device operated close to the head.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Headrest 2 Support part 3 Back cover 4 Stay 10 Headrest main body 11 Rear plate part 11a Recessed part ah Receiving port 11b Spring hook part 11c Through-hole cb Top surface ca Bottom face 12 Side plate part 12a Long hole 20 Movable body 20a Connection shaft 21 Ratchet 21a Surface 21b Stepped portion 22 Slit 30 Follower 30a Connection shaft 30c Connection shaft 31 Front plate portion 32 Side plate portion 40 Stopper piece 40a Through hole 40b Recession portion 41 Engagement portion 42 Operation portion (blocking portion)
43 connecting shaft 43a end 43b collar 43c overhang 44 spring hook S1 main spring S2 sub spring t plate thickness dimension

Claims (2)

A rotating hinge mechanism for a vehicle seat in which a rotating body is rotatably connected to a fixed body by a connecting shaft,
The connecting shaft is inserted into the rotating body to a position positioned in the axial direction, and is attached so that end portions of the shaft protrude and are assembled on both sides in the axial direction of the rotating body. Each end is inserted into and attached to the fixed body in a direction perpendicular to the axial direction, so that the rotating body is supported rotatably with respect to the fixed body about the connecting shaft. ,
The connecting shaft is formed with a protruding portion that protrudes radially outward in a portion of the shaft shape that is inserted into the rotating body, and the connecting shaft is axially connected to the rotating body. When inserted from one side of the rotating body, it is received in a recess formed in a side surface on one side in the axial direction of the rotating body, but when inserted into the rotating body from the other side in the axial direction, the axial direction of the rotating body In contact with the other side surface of the connecting shaft to prevent axial movement of the connecting shaft ,
The rotating body is formed with a blocking portion that abuts against the fixed body and prevents the connection shaft from being inserted when the rotating body is assembled to the fixed body in opposite directions . A rotating hinge mechanism for the seat. A rotary hinge mechanism for a vehicle seat according to claim 1,
The rotating hinge mechanism of the vehicle seat is incorporated in a movable headrest device that moves the headrest close to the seated person's head when a vehicle rear collision occurs,
The headrest has a headrest main body corresponding to the fixed body fixed to a seat back and a movable body rotatably linked to the headrest main body, and the head of the seated person as the movable body rotates. The support part that catches the head moves to the collision response position close to the head,
The headrest body is connected to a stopper piece corresponding to the rotating body that engages with the movable body by rotation and prevents the return rotation of the movable body so as to keep the support portion in a collision-corresponding position. A rotating hinge mechanism for a vehicle seat.

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