JP5251277B2 - Movable headrest device - Google Patents

Description

  The present invention relates to a movable headrest device. Specifically, the present invention relates to a movable headrest device that operates a headrest close to a seated person's head when a vehicle rear-end collision occurs.

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 the same disclosure, when a vehicle rear-end collision occurs and the movable part of the headrest approaches the head, the stopper that prevents the headrest from moving back functions, so that the movable part of the headrest approaches the head. It has become possible to stay in.
JP 2007-106384 A

  However, in the prior art disclosed above, when the movable portion of the headrest is prevented from returning by engaging the stopper piece by rotation, the stopper piece is assembled in a limited narrow space in the headrest. It becomes difficult.

  The present invention was devised to solve the above-described problems, and the problem to be solved by the present invention is to improve the assembling property of the stopper piece for preventing the return of the movable headrest device. .

In order to solve the above problems, the movable headrest device of the present invention takes the following means.
First, a first invention is a movable headrest device that operates a headrest close to a seated person's head when a vehicle rear-end collision occurs. The headrest includes a headrest body fixed to the seat back and a movable body rotatably linked to the headrest body. The headrest is configured such that the support portion that receives the head of the seated person moves to a collision corresponding position close to the head as the movable body rotates. The headrest body is connected to a stopper piece that engages the movable body by rotation and prevents the return rotation of the movable body so as to keep the support portion at the collision corresponding position. The stopper piece can be connected to the headrest body by rotating the connecting shaft, which is the center of rotation formed on the stopper piece, into the recess formed in the headrest body in a direction perpendicular to the axial direction. This is done by being pivotally supported. The connecting shaft formed on the stopper piece has a shape that can be inserted and removed when it faces a specific rotation angle with respect to the concave portion of the headrest body. The functional area in which the stopper piece rotates between the lock position where the movable body is prevented from returning and the release position deviated from the lock position is set to an area deviated from a specific rotation angle.

  According to the first invention, the stopper piece is rotatably supported in the concave portion by inserting the connecting shaft serving as the center of rotation into the concave portion of the headrest body toward the specific rotation angle. Concatenated as As a result, the stopper piece is stably held in the functional area that rotates between the lock position and the release position without coming off the recess. Thus, the stopper piece can be easily assembled to the headrest body so as to be rotatable by inserting the connecting shaft into the concave portion in a specific direction.

  Next, according to a second aspect of the present invention, in the first aspect described above, the recess formed in the headrest body has a circular shape so that the inner peripheral surface thereof can rotatably support the connecting shaft of the stopper piece. It is curved. The opening width of the receiving port of the recess is formed narrower than the inner diameter of the inner peripheral surface of the recess. The connecting shaft of the stopper piece has a horizontal diameter in which the shape of the insertion portion inserted into the concave portion matches the opening width of the receiving port, and a vertical diameter that matches the circular inner peripheral surface in the concave portion. It is formed in the shape to have.

  According to the second aspect of the present invention, the connecting shaft of the stopper piece is brought into contact with the inner peripheral surface of the concave portion when the insertion portion formed in the vertically long shape is inserted into the concave portion of the headrest body from the receiving port. It is in a state where it is in contact with and rotatably supported. As described above, the shape of the connecting shaft that enables the stopper piece to be inserted and removed when the stopper piece faces a specific rotation angle with respect to the concave portion of the headrest body can be embodied as a vertically long shape.

  Next, according to a third aspect, in the first or second aspect described above, the headrest body is formed in an enclosed shape that opens to the front side with both side portions projecting to the front side of the vehicle. The stopper piece is inserted from the front side of the vehicle into a receiving port of a recess whose connecting shaft is formed between both side portions of the headrest body and opens to the front side of the vehicle. In the locked state in which the movable member is prevented from returning and rotating, the stopper piece is configured such that the connecting shaft is pressed backward in the recess by the support load that supports the head of the seated person.

  According to the third aspect of the present invention, the stopper piece is inserted into the recess from the opening side (front side) of the headrest body, so that the stopper piece can be assembled more easily. The stopper piece receives a support load for supporting the seated person's head from the support portion in the locked state in which the return rotation of the movable body is prevented, and this load is received on the inner peripheral surface of the concave portion of the coupling shaft and the headrest body. Receiving at the contact part. Accordingly, since the connecting shaft does not come out of the recess even when receiving the same load, the load on the head can be stably received.

  Embodiments of the best mode for carrying out the present invention will be described below with reference to the drawings.

  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, with reference to FIG. 2 to FIG. 6, a structure for operating the support portion 2 to the front side when a rear collision occurs incorporated in the headrest 1 will be described. 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. 5, the ratchet 21 is integrated with the movable body 20 and rotates around the connecting shaft 20 a. 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.

  As a result, as shown in FIGS. 5 to 6, 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 sliding within 12a, the whole moves forward and obliquely upward (see FIG. 6) and rearward and obliquely downward (see FIG. 5). 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. 5, 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 and 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. 5, 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. 6, the follower 30 moves forward and upward in such a manner that it is pushed up by this, and the support part 2 is transferred to a collision-corresponding position close to the seated person's head. 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. 4, a connecting shaft 43 is inserted into the stopper piece 40 in the width direction, and the connecting shaft 43 is formed in each recess 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. 5, the upper end portion of the sub spring S <b> 2 is hooked on a spring hook portion 44 formed on the 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. 6, the movable body 20 has its connecting shaft 30 c in the long holes 12 a, 12 a reaches the front upper end of each of the long holes 12 a, 12 a, so 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. 6, the movable body 20 has a stopper on the stepped portion 21 b that has fallen to the rotational position even when 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 for the connecting shaft 43 assembled | attached to the stopper piece 40 mentioned above, the insertion parts 43a and 43a which protruded to the both sides of the stopper piece 40 by the assembly | attachment are engage | inserted in each recessed part 11a and 11a of the headrest main body 10. FIG. It comes to be installed. These insertion parts 43a and 43a are formed in a vertically long shape in which the cross-sectional shape of the shaft is cut out from a perfect circular shape.

  Specifically, as shown in FIG. 4, the shape of each insertion portion 43 a, 43 a has a horizontal diameter that matches the opening width of the receiving port ah, ah of each recess 11 a, 11 a, and each recess 11 a, 11 a. It is formed in a vertically long shape having a longitudinal diameter that matches the inner circumferential surface of a perfect circle. The vertically long end surfaces of the insertion portions 43a and 43a are formed in curved arc shapes that match the inner circumferential surfaces of the concave portions 11a and 11a that are curved in a perfect circle shape. Therefore, the connecting shaft 43 having the above configuration inserts the insertion portions 43a and 43a into the receiving ports ah and ah of the concave portions 11a and 11a in the longitudinal direction perpendicular to the axial direction. To be accepted.

  Thereby, the connection shaft 43 is assembled | attached to each recessed part 11a, 11a as the state which each insertion part 43a, 43a was rotatably supported by the internal peripheral surface shape of each recessed part 11a, 11a. Here, the insertion portions 43 a and 43 a of the connecting shaft 43 are formed so that the longitudinal direction of the cross-sectional shape thereof faces the plate surface direction of the stopper piece 40. The receiving ports ah and ah of the recesses 11a and 11a that receive the insertion portions 43a and 43a are formed so as to open obliquely upward in the front of the drawing, and the insertion portions 43a and 43a are inclined upward in the front direction. It has been accepted from the side.

  Therefore, the assembling operator holds the insertion portions 43a and 43a in the recesses 11a and 11a so as to thrust the plate by grasping the plate portion on the distal end side where the engaging portion 41 of the stopper piece 40 is formed. By inserting into the inlets ah, ah, the stopper piece 40 can be easily assembled from the obliquely upper front side where the headrest body 10 is opened. 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 part 42 is assembled in a state of protruding rearward from the through hole 11c.

  Thus, the connecting shaft 43 of the stopper piece 40 is formed in a vertically long shape that can be inserted and removed only when it is directed to a specific rotation angle with respect to each of the recesses 11 a and 11 a of the headrest body 10. As shown in FIGS. 5 to 6, the connecting shaft 43 of the stopper piece 40 is assembled to the recesses 11 a and 11 a so that the stopper piece 40 prevents the return rotation of the movable body 20 (FIG. 6). The functional region that rotates between the solid line position) and the release position (the virtual line position) is set to a region that is out of the specific rotation angle that is inserted into and removed from the recesses 11a and 11a.

  Further, as shown in FIG. 6, the connecting shaft 43 of the stopper piece 40 has a supporting load that supports the seated person's head when the stopper piece 40 is locked to the stepped portion 21 b of the ratchet 21. By receiving, it receives a pressing force on the rear side and is supported by the inner peripheral surface of each recess 11a, 11a. As described above, the stopper piece 40 can stably receive the load received from the head without detaching from the recesses 11a and 11a in the functional region rotating between the lock position and the release position.

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. It is an assembly process figure of a stopper piece. 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 Rear 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 12 Side plate part 12a Long hole 20 Movable body 20a Connecting shaft 21 Ratchet 21a Outer peripheral surface 21b Step portion 22 Slit 30 Follower 30a Connection shaft 30c Connection shaft 31 Front plate portion 32 Side plate portion 40 Stopper piece 41 Engagement portion 42 Operation portion 43 Connection shaft 43a Insertion portion 44 Spring hook portion S1 Main spring S2 Sub spring

Claims (2)

A movable headrest device that operates a headrest close to a seated person's head when a vehicle rear collision occurs,
The headrest has a headrest main body fixed to a seat back and a movable body rotatably linked to the headrest main body, and a support portion for receiving the head of the seated person as the movable body rotates. It moves to the position corresponding to the collision close to the part,
The headrest body is connected to a stopper piece 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. In this connection, the connecting shaft, which is the center of rotation formed in the stopper piece, is inserted into a recess formed in the headrest body in a direction perpendicular to the axial direction, and is rotatably supported by the recess. The connecting shaft formed on the stopper piece is shaped so that it can be inserted and removed when it faces a specific rotation angle with respect to the concave portion of the headrest body. The functional area that rotates between the lock position that prevents rotation and the release position that deviates from the lock position is set to an area that deviates from the specific rotation angle ,
The headrest body is formed in an enclosed shape that opens to the front side with both side portions projecting to the vehicle front side,
The stopper piece is inserted from the front side of the vehicle into a receiving opening of a recess whose connecting shaft is formed between both side portions of the headrest body and opens to the front side of the vehicle. In the locked state in which the body is prevented from returning and rotating, the connecting shaft is pressed backward in the recess by a supporting load that supports the head of the seated person. Headrest device. The movable headrest device according to claim 1,
The concave portion formed in the headrest body is formed in a circular shape so that the inner peripheral surface thereof can rotatably support the connecting shaft of the stopper piece, and the opening width of the receiving port of the concave portion is The connecting shaft of the stopper piece is formed to be narrower than the inner diameter of the inner peripheral surface of the concave portion, and the shape of the insertion portion inserted into the concave portion has a lateral diameter that matches the opening width of the receiving port. A movable headrest device, wherein the movable headrest device is formed in a shape having a longitudinal diameter that matches the inner circumferential surface of a perfect circle in the recess.

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