JP4784479B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat. More specifically, the present invention relates to a vehicle seat provided with a headrest moving mechanism that can move a support portion of a headrest that receives a head of an occupant seated on a seat relative to a seatback when the vehicle collides.

2. Description of the Related Art Conventionally, some seats for automobile seats employ an active headrest that can support a passenger's head by instantaneously moving the headrest forward when a rear-end collision of the vehicle occurs. For example, the following Patent Document 1 discloses a technique for moving a support portion serving as a head receiving portion of a headrest forward using the movement of a four-bar linkage mechanism.
In this disclosure, two link members parallel to each other are disposed between the base of the headrest and the support portion to constitute a four-bar linkage mechanism. The four-joint link mechanism is always held in a posture state at an initial position where the support portion is retracted to the headrest base side before a vehicle collision occurs. Then, when the vehicle collision occurs, the above holding state is released, and the support portion moves forward while the two links are rotated by the biasing.
In this disclosure, a lock mechanism is provided that engages with the support portion that moves forward and prevents the support portion from being pushed back by hitting the head that has tilted backward. This locking mechanism is configured to restrict movement of the support portion in the return direction by the latching structure of the latch. Therefore, when a vehicle collision occurs, the support portion is held in a position in contact with the occupant's head by the lock mechanism, so that the occupant's head can be stably received at this position.
JP 2002-142910 A

  However, in the conventional disclosed technique, the latch of the lock mechanism that restricts the movement of the support portion in the return direction in order to perform the operation of returning the support portion to the initial position before moving forward after the vehicle collision ends. The operation of releasing the meshing state had to be performed, and the operability was poor.

  The present invention has been devised as a solution to the above-described problem, and the problem to be solved by the present invention is that when a vehicle collision occurs, the front portion of the headrest before the head reaches the collision corresponding position. Even if it is in the middle of movement, it can be controlled so that it is not pushed back backwards, and when the bearing is returned to the initial position before moving forward after the vehicle collision ends, the return prevention restriction does not work There is in doing so.

In order to solve the above problems, the vehicle seat of the present invention takes the following means.
A first aspect of the present invention is a vehicle seat including a headrest moving mechanism that can move a support portion of a headrest that receives a head of an occupant seated on a seat relative to a seatback when the vehicle collides. The headrest moving mechanism has a link member and a guide path. The link member links both the support portion of the headrest and the base installed on the upper portion of the seat back so that the support portion can be rotated around the shaft support position linked to the base. The guide path is formed on the side surface portion of the base in order to position the posture position of the support portion accompanying the rotation of the support portion by link connection of the link members. In this guide path, an engaging pin having a shape protruding in the width direction formed integrally with the support portion is slidably inserted and engaged, and the engagement pin slides as the support portion rotates. It is formed in a concave shape so as to guide it. The guide path is moved upward to a collision-corresponding position that is moved relatively forward and upward from the normal initial position before the vehicle collision occurs with the rotation of the support portion. The guide shape extends. A stopper groove having a partially depressed shape is formed in a part of the guide route. The stopper groove is used when the bearing pin receives a receiving load that catches the head of the occupant while the engagement pin slides from the initial position along the guide path toward the collision response position when a vehicle collision occurs. , It is formed in a shape capable of receiving the engagement pin and receiving the load. The base is provided with avoidance moving means capable of moving the engagement pin while avoiding the stopper groove when the engagement pin slides from the collision corresponding position to the initial position. . The avoidance moving means is a closing member that can close the stopper groove formed in the guide path by sliding movement. The closing member is in a position in which the engaging pin is out of the stopper groove in the normal initial position before the vehicle collision occurs, but the stopper pin is closed by the sliding movement of the engaging pin to the collision corresponding position. The stopper pin is closed by sliding and the engaging pin is disposed relative to the base so that the guide pin slides from the collision corresponding position to the initial position in the closed state of the stopper groove.
According to the first aspect of the present invention, the engaging pin formed on the support portion positions the tilt posture position of the support portion pivotally attached to the link member by engaging with the guide path formed on the base. Do. When a vehicle collision occurs, the engagement pin slides in the traveling direction along the guide path in response to the rotation of the link member. As a result, the support portion changes from the initial position posture state to the collision corresponding position posture state. When the engagement pin moves from the initial position toward the collision-corresponding position, the support pin is pushed by the receiving load received from the head of the occupant during the movement, and enters the stopper groove. As a result, the engagement pin is received in the stopper groove, and the support portion is able to receive the occupant's head at a midway position before reaching the collision corresponding position without being pushed back by the occupant's head. It becomes. When the engagement pin moves from the collision-corresponding position toward the initial position, the engagement pin moves in such a way as to avoid the stopper groove by the closing member. Therefore, in this case, the engagement pin can be smoothly returned to the initial position without being erroneously inserted into the stopper groove. The closing member is held in a position deviated from the shape of the stopper groove until the engaging pin reaches the collision-corresponding position from the initial position. Therefore, during this period, the engagement pin is allowed to enter the stopper groove. The closing member is moved to a position where it overlaps the shape of the stopper groove when the engaging pin reaches the collision corresponding position, and is switched to a position state where the stopper groove can be closed with respect to the engaging pin. Held.

Next, according to the second invention, in the first invention described above, when the guide pin is slid from the collision corresponding position to the initial position in the closed state of the stopper groove by the closing member, The closing member is arranged with respect to the base so as to release the closing of the stopper groove by the closing member again by the sliding movement to the initial position.
According to the second aspect of the invention, the closing member is moved to the position where the stopper groove is released again by returning the engagement pin from the collision corresponding position to the initial position.

Next, according to a third aspect, in the second aspect described above, the engaging pin is provided with a biasing means for constantly biasing the engaging pin toward the collision corresponding position. Engaging means for engaging the engaging pin at this position in the initial position state is provided.
According to the third invention, the engagement pin is pushed and moved by the receiving load received from the head of the occupant during the movement of the guide path from the initial position toward the collision corresponding position. Enter the stopper groove. However, when the receiving load received from the head of the occupant is unloaded, the engagement pin moves to the collision corresponding position by the urging force of the urging means. Therefore, when a vehicle collision occurs, the engagement pin is always positioned at the collision corresponding position. Therefore, during the operation of returning the engagement pin to the initial position after the occurrence of the vehicle collision, the inside of the guide path in the state where the stopper groove is closed by the closing member can be smoothly returned to the initial position. Since the engaging pin is returned to the initial position and is engaged by the engaging means, the engaging pin is held at the initial position against the urging of the urging means.

Next, a fourth invention is the above-described second or third invention, wherein the sliding movement structure of the closing member is engaged with the long hole formed in the base so as to be slidable. In addition, the two pushing parts formed on the closing member are arranged so as to protrude into the guide path and sandwich the engaging pin between them, and the engaging pin slides between the initial position and the collision corresponding position. Each pushing part is pushed by the movement to make the closing member slide in the same direction as the engaging pin.
According to the fourth aspect of the present invention, the closing member is slid in the same direction as the engagement pin by being pushed by the movement in which the engagement pin slides.

The present invention can obtain the following effects by taking the above-described means.
First, according to the first aspect of the present invention, a stopper groove for preventing return is set in the guide path for moving and guiding the engagement pin formed in the support portion of the headrest, and when the support portion is moved in the return direction, the engagement is performed. By providing a closing member that can guide the pin so that it can avoid the stopper groove, at the time of a vehicle collision, even if it is in the middle of the forward movement before the support part reaches the collision corresponding position, the rear side Therefore, when the support portion is returned to the initial position before moving forward after the vehicle collision, the return prevention restriction can be prevented.
Furthermore, according to the second aspect of the present invention, the closed state of the stopper groove by the closing member can be released by returning the engaging pin to the initial position, so that the engaging pin is directed from the initial position to the collision corresponding position. When the sliding movement is made, the engaging pin can be received in the stopper groove again.
Further, according to the third aspect of the present invention, the urging means for constantly urging the engaging pin toward the position corresponding to the collision and the engaging means for engaging the engaging pin at the initial position are provided. After the occurrence, the stopper pin can be closed by the closing member by always positioning the engaging pin at the collision corresponding position, and the engaging pin can be smoothly returned to the initial position.
Further, according to the fourth invention, the sliding movement structure of the closing member can be embodied as a relatively space-saving and simple structure as a sliding movement structure that is pushed in the same direction by the engagement pin. .

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

First, the vehicle seat according to the first embodiment will be described with reference to FIGS.
The seat 1 according to the present embodiment includes a seat back 2 that serves as a backrest portion for an occupant, a seat cushion 3 that serves as a seating portion, and a headrest 4 that serves as a receiving portion for the head. In addition, in each figure of FIGS. 1-16, in order to make the structure of the seat 1 intelligible, the internal structure of the seat back 2 and the headrest 4 is represented.
Here, the headrest 4 has two rod-like stays 4B, 4B erected at the lower part thereof in the insertion ports Sa, Sa of the cylindrical supports 2S, 2S installed at the upper part of the seat back 2. Each is inserted into the upper part of the seat back 2 by being inserted. Specifically, the supports 2S and 2S are integrally fixed to an upper frame Fu that forms an upper arm of a back frame 2F that forms a skeleton of the seat back 2.
The headrest 4 is normally held in the installed posture position so that the head of the occupant seated on the seat 1 can be received at the rear side position. However, the headrest 4 is configured such that when a rear collision of the vehicle occurs, the front-side support portion 4A that receives the head of the headrest 4 can be instantaneously moved forward. That is, at the time of the occurrence of the collision, the support portion 4A can be moved closer to the back of the back of the head with respect to an occupant in a sitting posture with the body floating forward from the seat back 2 or the headrest 4. Yes. Thereby, when the vehicle collision occurs, it is possible to prevent the head from being tilted backward by the momentum, and the load on the neck can be reduced.

The operation of moving the support portion 4A of the headrest 4 forward at the time of the vehicle collision is performed by the headrest moving mechanism 10 incorporated in the headrest 4.
Here, in FIG. 4, the appearance of the headrest moving mechanism 10 is shown in a side view. As shown in the figure, the headrest moving mechanism 10 keeps the support portion 4A in the initial state in which the forward movement is restricted, before the vehicle collision occurs.
When the vehicle collision occurs, the headrest moving mechanism 10 cancels the forward movement restriction state of the support portion 4 </ b> A and moves the support portion 4 </ b> A forward and upward by the bias of the tension spring 16. As a result, the headrest moving mechanism 10 moves the support portion 4A to the collision-corresponding position approached to just behind the back of the head, as shown in FIG. In the headrest moving mechanism 10, in a state where the support portion 4 </ b> A is moved to the collision corresponding position, the support portion 4 </ b> A is pushed back to the rear side even when a load is applied that causes the head of the occupant to tilt backward due to the occurrence of a vehicle collision. There is no such thing. As a result, the head of the occupant can be stably received by the support portion 4A held at the collision corresponding position.

By the way, returning to FIG. 4, the operation of releasing the restriction state of the support portion 4 </ b> A described above is performed by the cable operation of the second cable 50 connected to the headrest moving mechanism 10. The second cable 50 is routed inside the headrest 4 and is axially connected to the first cable 40 routed inside the seat back 2, as shown in FIG. The first cable 40 is connected to the lower end of the second cable 50 on the upper end side, and the lower end side is connected to a mechanism that pulls the first cable 40 in the event of a vehicle collision.
Here, in FIG. 2, the connection structure between the first cable 40 and the second cable 50 is enlarged and shown in an exploded perspective view. As shown in the figure, the first cable 40 and the second cable 50 are connected to each other at the connecting end portion of the headrest 4 where the left stay 4B shown in the figure is inserted into the support 2S. It has come to be. The connection structure of the first cable 40 and the second cable 50 can be connected to or separated from each other by movement of the left stay 4B with respect to the support 2S. Thereby, the operation | work which attaches or removes the headrest 4 with respect to the seat back 2 can be performed freely.

Here, in FIG. 3, the mechanism for pulling the lower end of the first cable 40 is shown enlarged in a perspective view. As shown in the figure, inside the seat back 2, a bending rod-like pushing member 20 extending in the width direction is disposed in the middle part thereof.
The pushing member 20 is formed as a receiving arm 21 that receives a backrest load of an occupant at a central portion in the width direction. The pushing member 20 is supported at its right end in the plane of the paper by a side frame Fs on the right side in the plane of the back frame 2F that forms the skeleton of the seat back 2 so as to be pivotable. Specifically, a torsion spring 20S is hung between the right end of the pushing member 20 in the drawing and the side frame Fs. The torsion spring 20S is provided in a state of being pre-twisted, and urges the pushing member 20 to rotate in a manner that moves the receiving portion 21 forward. As a result, the pushing member 20 is held in a state where the rotation by the urging is restricted at a position where it comes into contact with a cushion pad (not shown) provided on the backrest surface of the seat back 2. Further, the pushing member 20 is rigidly coupled at its left end in the drawing to the connecting arm 31A of the damper 30 disposed on the left side frame Fs.
Here, the damper 30 has a rotary structure including a rotating shaft 31 and a cylindrical case 32. Specifically, the rotation shaft 31 is connected to the case 32 so as to be pivotable in a shape inserted into the cylindrical shape of the case 32. A viscous fluid such as silicone oil is filled in a sealed state between the cylindrical case 32 and the rotating shaft 31. The viscous fluid transmits the rotational force of the rotating shaft 31 to the case 32 by its viscous resistance depending on the relative rotation speed of the rotating shaft 31 with respect to the case 32, or the rotating shaft 31 is transferred to the case 32. It has the characteristic that it can be swayed internally to cut off transmission.
The rotation shaft 31 is supported by the side frame Fs on the left side in the drawing so that the shaft can rotate. Specifically, the rotation shaft 31 is pivotally supported at a position coaxial with the position where the right end of the pushing member 20 in the drawing is pivotally supported. The rotating shaft 31 is integrally connected to the connecting arm 31A formed to extend outward in the radial direction by rigidly coupling the left end portion of the pushing member 20 described above. ing. Therefore, the pushing member 20 is supported so as to be pivotable with respect to the side frames Fs and Fs by the shaft support structure at both ends arranged on the same axis.

The pushing member 20 configured as described above receives a backrest load from the occupant at the receiving arm 21. Thereby, the pushing member 20 receives the movement by which the receiving arm 21 is pushed rearward, and pivots the turning shaft 31 of the damper 30 connected integrally therewith.
At this time, when the rotational speed of the rotational shaft 31 is a relatively slow speed that is received by the backrest load during normal seating use, the rotational force of the rotational shaft 31 is transferred to the case 32. Is not transmitted. However, when the rotational speed of the rotational shaft 31 is a relatively high speed received by a relatively large backrest load caused by a vehicle collision, the rotational force of the rotational shaft 31 is transmitted to the case 32, The case 32 rotates integrally therewith.
Here, the lower end portion of the inner member 41 of the first cable 40 is connected to the operation arm 32A formed to extend outward in the radial direction of the case 32, and the case 32 is in an integral state. . Therefore, the case 32 pulls the inner member 41 downward by rotating the shaft integrally with the rotation shaft 31. Accordingly, as described above with reference to FIG. 4, the second cable 50 is operated by the cable, and the restriction state of the support portion 4 </ b> A by the headrest moving mechanism 10 is released. Here, referring back to FIG. 1, the operating arm 32A of the case 32 described above comes into contact with a stopper 61 of a bent plate-shaped mounting bracket 60 fixed to a side frame Fs, which will be described later, thereby pressing the torsion spring 20S. The rotational movement in the urging direction integral with the moving member 20 is restricted.

Next, the headrest moving mechanism 10 will be described. Although the configuration of the headrest moving mechanism 10 is shown in FIGS. 4 to 12, since the state of FIG. 7 well represents the configuration of each unit, the configuration of each unit will be described below using FIG. 7. .
That is, as shown in FIG. 7, the headrest moving mechanism 10 includes a base 11, a pair of connection links 12 and 12, a pair of support members 13 and 13, a pair of hooks 14 and 14, and an operation member 15. And a tension spring 16 and a pair of closing members 17, 17. Here, the pair of connecting links 12 and 12 correspond to the link member of the present invention, the tension spring 16 corresponds to the biasing means of the present invention, and the hooks 14 and 14 and the operation member 15 serve as the engaging means of the present invention. Equivalent to.
Specifically, the base 11 is made of synthetic resin, and is erected from a plate-shaped rear surface portion 11B, a plate-shaped bottom surface portion 11D extending forward from the lower end edge thereof, and left and right side edges thereof. The plate-like side surface portions 11S and 11S and the upper surface portion 11U formed in a shape connecting the upper edges of the both side surface portions 11S and 11S are integrally provided. Here, FIG. 12 shows a configuration diagram of the headrest moving mechanism 10 as seen from the Y line direction of FIG. As shown in the figure, a plurality of plate-like ribs 11R, 11R, 11R, and 11R stand up from the rear surface portion 11B and the bottom surface portion 11D in parallel between the side surface portions 11S and 11S of the base 11. The base 11 is reinforced.
Returning to FIG. 7, the upper ends of the stays 4 </ b> B and 4 </ b> B are inserted into the bottom surface portion 11 </ b> D of the base 11 and are integrally fixed. These stays 4B and 4B are formed in a tubular shape, and are attached in such a manner that the opening on the upper end side is exposed on the upper surface side of the bottom surface portion 11D. Here, each stay 4B, 4B is formed in a bent shape in which the upper part from the middle of the stay 4B is inclined forward in the shape of a "ku".
In addition, long holes 11H and 11H having a shape that is wound in a wavy shape are formed in the above-described side surface portions 11S and 11S. The long holes 11H and 11H are formed between first lower end portions H0 and H0 and upper end portions H3 and H3, and first stopper grooves H1 and H1 each having a concave shape stepped in the rear side (right side in the drawing). Second stopper grooves H2 and H2 are formed. Here, the long holes 11H and 11H correspond to the guide path of the present invention, and the first stopper grooves H1 and H1 and the second stopper grooves H2 and H2 correspond to the stopper grooves of the present invention.

Next, the pair of connecting links 12 and 12 are made of synthetic resin, and are arranged side by side in the width direction so as to link the portion near the upper end of the base 11 and the portion on the rear surface side of the support portion 4A. It is installed. Specifically, the connecting links 12 and 12 are connected at their rear ends so as to be pivotable by connecting shafts 12 </ b> A extending in the width direction and penetrating the both side surfaces 11 </ b> S and 11 </ b> S of the base 11. More specifically, as shown in FIG. 12, the rear ends of the connecting links 12, 12 are the left and right side surfaces 11 </ b> S, 11 </ b> S formed on the base 11 and the ribs 11 </ b> R, 11 </ b> R formed inside them. It arrange | positions in the position pinched | interposed between, respectively, and is pivotally supported by 12 A of connecting shafts. Returning to FIG. 7, the connecting links 12, 12 can be pivoted to the support portion 4 </ b> A by a connecting shaft 12 </ b> B whose front end is connected to the rear surface side portion of the support portion 4 </ b> A and extends in the width direction. It is connected. Here, the connecting shafts 12A and 12B are arranged in parallel directions.
As shown in the figure, the connecting links 12 and 12 are brought into contact with the upper surface portion 11U of the base 11 by rotating clockwise from the state of FIG. 4 around the connecting shaft 12A. Thereby, the rotation to the same direction of the connection links 12 and 12 is controlled.

Next, the pair of support members 13 and 13 are formed side by side in the width direction of the support portion 4A, and are formed integrally with the support portion 4A so as to extend from the rear surface side to the rear side thereof. Here, the entire support portion 4A is formed into a curved plate shape by integral molding of synthetic resin, and the above-described pair of support members 13 and 13 and the above-described connecting shaft 12B are connected to the rear surface side thereof. Are connected to each other in the width direction so as to protrude rearward.
The rear ends of these support members 13 and 13 are connected to each other by a connecting shaft 13A extending in the width direction. Here, the connecting shaft 13A corresponds to the engagement pin of the present invention. Specifically, as shown in FIG. 12, the rear ends of the support members 13 and 13 are between the outer ribs 11R and 11R formed on the base 11 and the ribs 11R and 11R formed on the inner sides thereof. It is arrange | positioned in the position pinched | interposed into, and is mutually connected with the connection shaft 13A. Here, referring back to FIG. 7, the connecting shaft 13A is arranged in a direction parallel to each of the connecting shafts 12A and 12B described above, and the long holes 11H formed in the side surface portions 11S and 11S of the base 11 are formed. , 11H. As a result, the support members 13 and 13 can be moved relative to the base 11 in the front-rear direction and the vertical direction within a range in which the connecting shaft 13A can move inside the long holes 11H and 11H. .
In addition, each rib 11R, 11R, 11R, 11R (refer FIG. 12) formed in the base 11 is formed in the shape which does not interfere with the connecting shaft 13A which moves the inside of the long holes 11H, 11H.

  Next, as shown in FIG. 5, the pair of hooks 14 and 14 are made of metal and are formed in a cam shape as a whole. Specifically, each of the hooks 14 and 14 is formed with upper jaw portions 14B and 14B and lower jaw portions 14C and 14C projecting in a claw shape at the peripheral edge thereof. These hooks 14 and 14 are arranged side by side in the width direction at a portion near the lower end of the base 11, and are connected to a connecting shaft 14 </ b> A extending in the width direction and penetrating through both side surfaces 11 </ b> S and 11 </ b> S of the base 11. They are connected together. Thus, the hooks 14 and 14 are supported so as to be pivotable with respect to the base 11. Specifically, as shown in FIG. 12, the hooks 14 and 14 are sandwiched between the left and right side surface portions 11S and 11S formed on the base 11 and the ribs 11R and 11R formed on the inside thereof. It arrange | positions at each position and is integrally connected with 14 A of connecting shafts. As a result, the hooks 14 and 14 are pivoted together as a unit. Here, the connecting shaft 14A is arranged in a direction parallel to the connecting shafts 12A and 12B and the connecting shaft 13A described above.

Here, FIG. 5 is represented as a cross-sectional view as viewed from the direction of FIG. 12 cut along the line V-V. In FIG. 5, in order to explain the operation structure of the headrest moving mechanism 10 in an easy-to-understand manner, In the drawing, components that do not actually appear are drawn. As shown in the figure, torsion springs 14S and 14S are hung between the hooks 14 and 14 and the base 11, respectively. Each of the torsion springs 14S and 14S is provided in the form of being wound around the connecting shaft 14A. One end of the torsion springs 14S and 14S is hooked on the hooks 14 and 14, and the other end is hooked on the base 11. These torsion springs 14S and 14S are provided in a pre-twisted state, and respectively urge the hooks 14 and 14 to rotate counterclockwise with respect to the base 11 from the state of FIG.
Further, the hooks 14 and 14 are formed with recessed locking grooves 14D and 14D at the peripheral portions thereof. A pair of operating arms 15C and 15C of an operating member 15 described later are engaged with the locking grooves 14D and 14D. Accordingly, the hooks 14 and 14 are in a state in which counterclockwise rotation due to the biasing is restricted.
Here, the operating arms 15C and 15C are integrally connected to a connecting shaft 15B provided on the left end side in the drawing, and are supported so as to be pivotable with respect to the base 11. A torsion spring 15S is hung between the one operating arm 15C and the base 11. The torsion spring 15S is provided in the form of being wound around the connecting shaft 15B. One end of the torsion spring 15S is hooked on the operating arm 15C and the other end is hooked on the base 11. The torsion spring 15S is provided in a state of being pre-twisted, and urges both the operating arms 15C and 15C to rotate clockwise with respect to the base 11 from the state of FIG. As a result, the operating arms 15C and 15C are normally held in the engaged postures that have entered the locking grooves 14D and 14D formed in the hooks 14 and 14, respectively.

The operating arms 15C and 15C are released from the engaged state with the hooks 14 and 14 by being rotated counterclockwise against the urging force. Thereby, the hooks 14 and 14 are released from the rotation restriction state by the operation arms 15C and 15C, and rotate integrally counterclockwise. And after that, each hook 14 and 14 latches by contacting with other structural members, such as connecting shaft 15B.
Here, the hooks 14 and 14 are exposed to the upper jaw portions 14B and 14B in the holes of the long holes 11H and 11H as shown in FIG. 4 in a state where the rotation of the hooks 14 and 14 is restricted by the operation arms 15C and 15C. The lower end portions H0 and H0 of the long holes 11H and 11H are held in a posture state in which they are sandwiched between the upper jaw portions 14B and 14B and the lower jaw portions 14C and 14C. Then, the hooks 14 and 14 are disengaged from the operating arms 15C and 15C (see FIG. 5) and are urged and rotated counterclockwise, thereby turning the upper jaw portion as shown in FIG. 14B and 14B are moved out of the long holes 11H and 11H, and the lower jaw portions 14C and 14C are pushed up from the lower side to be exposed in the long holes 11H and 11H.

With reference to FIG. 6, the hooks 14 and 14 having the above-described configuration perform an operation of dropping the connecting shaft 13A connected to the support members 13 and 13 to the lower end portions H0 and H0 of the long holes 11H and 11H. The connecting shaft 13A can be engaged and held at the lower end portions H0 and H0.
Specifically, as described above, the hooks 14 and 14 are in a posture state in which the lower jaw portions 14C and 14C are exposed in the holes of the long holes 11H and 11H. Accordingly, in this state, by dropping the connecting shaft 13A into the lower end portions H0 and H0, the lower jaw portions 14C and 14C of the hooks 14 and 14 are pushed out of the long holes 11H and 11H in such a manner as to be pressed by this. . The hooks 14 and 14 are rotated clockwise by the movement of the lower jaw portions 14C and 14C. As shown in FIG. 4, the connecting shaft 13A moves to the lower ends H0 and H0 of the long holes 11H and 11H. While being dropped, each upper jaw part 14B, 14B is turned on the upper side. Then, as shown in FIG. 5, by the clockwise rotation of the hooks 14, 14, the operating arms 15 </ b> C, 15 </ b> C enter the locking grooves 14 </ b> D, 14 </ b> D of the hooks 14, 14 by urging. Is locked in that position. As a result, the connecting shaft 13A is sandwiched between the upper jaw portions 14B, 14B and the lower jaw portions 14C, 14C of the hooks 14, 14, and the connecting shaft 13A has the long holes 11H, 11H, as shown in FIG. 11H is held at the position (initial position) of the lower end portions H0 and H0.
The connecting shaft 13A is held at the positions of the lower end portions H0 and H0 described above, so that the support portion 4A is held at the initial position.

Next, as shown in FIG. 4, the operation member 15 is made of synthetic resin, and the connecting arm 15 </ b> A disposed on the outer surface side of the left side surface portion 11 </ b> S of the base 11 illustrated in FIG. The operation arms 15C and 15C described above are integrally connected by a connecting shaft 15B. Returning to FIG. 4, the connecting arm 15 </ b> A is connected to the upper end of the inner member 51 of the second cable 50, and the connecting shaft 15 </ b> B is moved by pushing and pulling the inner member 51 in the axial direction (vertical direction). It is designed to rotate around the center.
The connecting arm 15A is always held in the posture state shown in FIG. 4 by the bias of the torsion spring 15S described above with reference to FIG. Then, the connecting arm 15A is rotated counterclockwise by performing an operation of pushing the inner member 51 of the second cable 50 upward from this state. Accordingly, returning to FIG. 5, the operation arms 15 </ b> C and 15 </ b> C also rotate together, and the rotation restricting state of the hooks 14 and 14 is released by this rotation, and the connecting shaft 13 </ b> A of the hooks 14 and 14 is released. The hold state is released.

Next, as shown in FIG. 4, the tension spring 16 includes a connecting shaft 12 </ b> A that connects the rear ends of the connecting links 12, 12 and the base 11, and a connecting shaft that connects the rear ends of the support members 13, 13. 13A. The tension spring 16 urges the connecting shaft 13A toward the connecting shaft 12A, and the connecting shaft 13A (see FIG. 4) held in the lower ends H0 and H0 of the long holes 11H and 11H has an upper end. It is encouraging towards H3 and H3.
Therefore, when the holding state by the hooks 14 and 14 is released by the operation of the operation member 15, the connecting shaft 13A has an upper end along the shape of the long holes 11H and 11H as shown in FIGS. It moves toward part H3, H3. With this movement, the support portion 4A moves relatively forward and upward from the initial position shown in FIG. 4 while the connecting links 12 and 12 are rotated.

Here, at the time of the occurrence of the above-described vehicle collision, in the process in which the support portion 4A moves forward and upward from the initial position, for example, before reaching the collision corresponding position as indicated by the phantom line in FIG. A passenger | crew's head may hit | support 4 A of support parts, and 4 A of support parts may be pushed and moved back. However, in this case, the connecting shaft 13A that moves in the long holes 11H and 11H is gradually waved to the rear side (the right side in the drawing) of the long holes 11H and 11H by the movement that is pushed to the rear side. The first stopper grooves H1 and H1 and the second stopper grooves H2 and H2 having a recessed shape are inserted. Here, in FIG. 6, the state in which the connecting shaft 13A enters the second stopper grooves H2 and H2 is indicated by a solid line.
Accordingly, the movement of the connecting shaft 13A can be restricted so as not to be pushed back to the lower end portions H0, H0 of the long holes 11H, 11H, and the support portion 4A can be prevented from being pushed back to the rear side. Accordingly, the head of the occupant can be stably received by the support portion 4A that is held at a fixed position.

Next, returning to FIG. 4, the pair of closing members 17, 17 are formed in a long shape with a synthetic resin, and are arranged in a state in which they can be slid relative to the base 11. Specifically, as shown in FIG. 12, the closing members 17 and 17 are provided between the outer ribs 11R and 11R formed on the base 11 and the ribs 11R and 11R formed on the inner sides thereof. It is arranged at each sandwiched position. The closing members 17 and 17 are respectively provided with pin members 17B1 and 17B1 and pins provided so as to protrude in the width direction with respect to the long holes Rh1 and Rh1 and the long holes Rh2 and Rh2 formed in the inner ribs 11R and 11R. The members 17B2 and 17B2 are engaged with each other so as to be slidable.
Here, returning to FIG. 4, the upper and lower ends of each of the closing members 17, 17 are provided with the first pushing portions 17 C 1, 17 C 1 having a shape projecting into the holes of the long holes 11 H, 11 H and the second pushing portions. Movement parts 17C2 and 17C2 are formed, respectively. The first pushing parts 17C1, 17C1 and the second pushing parts 17C2, 17C2 are both equivalent to the pushing parts of the present invention, and the connecting shaft 13A is slidably moved in the long holes 11H, 11H. It is arranged and formed so as to be sandwiched between them. As shown in FIG. 10 and FIG. 11, the first pushing parts 17C1, 17C1 and the second pushing parts 17C2, 17C2 have the connecting shaft 13A in the initial positions (in the holes 11H, 11H). 10) and a movement to slide to the collision-corresponding position (see FIG. 11), the closing members 17 and 17 are slid in the pushed direction.
The closing members 17 and 17 are formed with first closing portions 17A1 and 17A1 and second closing portions 17A2 and 17A2 that are swelled stepwise at the front side (the left side in the drawing). ing. The first closing parts 17A1, 17A1 and the second closing parts 17A2, 17A2 are formed following the shape of the first stopper grooves H1, H1 and the second stopper grooves H2, H2 each having a wave-like step shape. ing. The first closing portions 17A1 and 17A1 and the second closing portions 17A2 and 17A2 are moved away from the first stopper grooves H1 and H1 and the second stopper grooves H2 and H2 as the closing members 17 and 17 slide. The state (see FIG. 10) and the position state (see FIG. 11) in which the first stopper grooves H1, H1 and the second stopper grooves H2, H2 are closed can be switched.

Specifically, the closing members 17 and 17 are moved and operated as follows by the movement of the connecting shaft 13A slidingly moving in the long holes 11H and 11H. That is, as shown in FIG. 10, the closing members 17, 17 have the long holes 11 </ b> H, 11 </ b> H in such a manner that the second pushing portions 17 </ b> C <b> 2, 17 </ b> C <b> 2 are pushed out to the connecting shaft 13 </ b> A when the connecting shaft 13 </ b> A is in the initial position. The first pushing portions 17C1 and 17C1 are held in a position state protruding into the holes on the upper end side of the long holes 11H and 11H.
Here, in each of the long holes Rh1, Rh1 and the long holes Rh2, Rh2 with which the closing members 17, 17 are slidably engaged, there are protrusion-shaped locking parts Rp1, Rp1, and locking parts Rp2, Rp2. Each is formed. The locking parts Rp1, Rp1 and the locking parts Rp2, Rp2 elastically lock the sliding movement of the pin members 17B1, 17B1 and the pin members 17B2, 17B2 by the elastic force of the synthetic resin. Yes. Specifically, the locking portions Rp2 and Rp2 formed in the lower elongated holes Rh2 and Rh2 lock the pin members 17B2 and 17B2 provided on the closing members 17 and 17, thereby causing the closing members 17 and 17 to move. The slide position shown in FIG. 10 is held. Accordingly, the closing members 17 and 17 are held in a position state where the first closing portions 17A1 and 17A1 and the second closing portions 17A2 and 17A2 are disengaged from the first stopper grooves H1 and H1 and the second stopper grooves H2 and H2. . Further, the locking portions Rp1, Rp1 formed in the upper long holes Rh1, Rh1, as shown in FIG. 11, by locking the pin members 17B1, 17B1 provided on the closing members 17, 17, The closing members 17, 17 are held in the sliding position shown in FIG. Accordingly, the closing members 17 and 17 are held in a position in which the first stopper grooves H1 and H1 and the second stopper grooves H2 and H2 are closed by the first closing portions 17A1 and 17A1 and the second closing portions 17A2 and 17A2. .
Therefore, the closing members 17, 17 having the above-described configuration are arranged such that the first stopper groove H 1, when moving in the traveling direction in which the support portion 4 A moves from the initial position shown in FIG. 4 to the collision corresponding position shown in FIG. Since it is in a position deviated from the shape of H1 and the second stopper grooves H2, H2, the first stopper grooves H1, H1 are in a stage before the connecting shaft 13A slidingly moving in the long holes 11H, 11H reaches the collision corresponding position. And movement to enter the second stopper grooves H2 and H2 is allowed (see FIG. 6).
However, as shown in FIG. 7, the closing members 17 and 17 reach the collision-corresponding position where the support portion 4A is illustrated, thereby resisting the elastic force of the locking portions Rp2 and Rp2 described above. It is pushed by the connecting shaft 13A. As a result, the closing members 17 and 17 are switched to a state in which the first stopper grooves H1 and H1 and the second stopper grooves H2 and H2 are closed, and due to the elastic force of the locking portions Rp1 and Rp1 (see FIG. 11). Retained. Accordingly, as shown in FIG. 8, when the support portion 4A is returned to the initial position from the above-mentioned collision-corresponding position, the connecting shaft 13A is moved by the closing members 17 and 17 in the middle of the return operation. It is regulated so as not to enter H1, H1 and the second stopper grooves H2, H2. Therefore, in this case, the connecting shaft 13A can be smoothly returned to the initial position without being erroneously inserted into the first stopper grooves H1, H1 and the second stopper grooves H2, H2.
As shown in FIG. 4, the closing members 17 and 17 are connected against the elastic force of the locking portions Rp <b> 1 and Rp <b> 1 described above when the support portion 4 </ b> A reaches the initial position shown in the drawing. It is pushed by the shaft 13A. As a result, the closing members 17 and 17 are again switched to the position state where they are disengaged from the first stopper grooves H1 and H1 and the second stopper grooves H2 and H2, and the locking portions Rp2 and Rp2 (see FIG. 10) are repelled. Held by force.

Next, returning to FIG. 2, the first cable 40 and the second cable 50 will be described.
That is, first, the first cable 40 has a double structure in which a linear inner member 41 having flexibility is inserted into the tubular outer member 42. The first cable 40 is configured as a connecting end portion in which the illustrated upper end portion is connected to the lower end portion of the second cable 50. Specifically, an engagement protrusion 41 </ b> P that protrudes outward in the radial direction in a T shape is formed on the upper end portion of the inner member 41. In addition, elongated holes 42S and 42S are formed in the peripheral wall on the upper end side of the outer member 42 so that both ends of the engagement protrusion 41P protruding in the T-shape can be penetrated in the radial direction. These long holes 42S and 42S are formed in the peripheral wall of the outer member 42 in a shape that is elongated in the axial direction, and the inner member 41 is relatively moved in the axial direction within the range of the long holes 42S and 42S. Is allowed. Further, a head portion 42H is formed at the upper end portion of the outer member 42 so as to close the tubular opening end portion.

The first cable 40 having the above configuration is held in a state where it is suspended by inserting the connecting end portion on the upper end side into the insertion port Sa of the left support 2S shown in the drawing from the lower side. It has become so. In detail, insertion grooves Sd and Sd extending in the axial direction from the lower end to the upper side are formed through the peripheral wall of the left support 2S at two axially symmetrical positions. Here, in FIG. 2, insertion grooves Sd and Sd are respectively represented by a solid line and a broken line on the left front side and the right back side of the drawing. The insertion grooves Sd and Sd are configured to receive both ends of a T-shaped engagement protrusion 41P formed at the upper end portion of the inner member 41 in the axial direction. Each insertion groove Sd, Sd is inserted into the insertion port Sa of the support 2S from the lower side by inserting the connecting end portion of the first cable 40, and the engagement protrusion 41P is engaged with them. It can be inserted and moved along the axial direction.
Here, the insertion groove Sd on one side illustrated on the left front side of the paper surface is formed in a shape in which the end portion in the axial direction is curved toward the left side (circumferential direction) in the paper surface. The insertion groove Sd on the other side formed on the back left side is formed in a shape curved in the right direction (circumferential direction) in the drawing in a shape that is axially symmetric with the insertion groove Sd on the one side. . Both end portions of the insertion grooves Sd and Sd are formed in a curved shape in the circumferential direction and downward in the axial direction.
Therefore, by inserting the first cable 40, the engaging protrusion 41P is inserted in the axial direction along the shape of the insertion grooves Sd, Sd, and then the first following the curved shape of each insertion groove Sd, Sd. By rotating the cable 40 in the circumferential direction, the engaging protrusion 41P can be inserted to the end of each insertion groove Sd, Sd (see FIG. 13). As a result, the relative movement of the engagement protrusion 41P in the axial direction (the gravitational direction and the opposite direction) relative to the support 2S is restricted, and the connecting end of the first cable 40 is located in the insertion port Sa of the support 2S. It is held as a state suspended by this as a state inserted in the.
Here, returning to FIG. 2, the peripheral wall on the upper end side of the outer member 42 is formed of synthetic resin, and a radius thereof is partially set so that a part of the axial direction matches the inner diameter of the insertion port Sa. It is formed in a shape bulging outward in the direction. A plurality of projections and depressions extending in the axial direction are formed in a serration over the entire circumference on the outer peripheral surface portion of the outwardly bulging portion. As a result, the outer member 42 can be fitted into the insertion port Sa without any backlash, and the axial movement of the outer member 42 relative to the insertion port Sa can be performed smoothly.

As shown in FIG. 3, the lower end of the first cable 40 is routed along the side frame Fs on the left side of the back frame 2F in the drawing. The lower end portion of the outer member 42 is held in an integral state in the axial direction by being fitted into an outer fixing piece Fo fixed to the side frame Fs. And the lower end part of the inner member 41 is connected with the operation arm 32A of the damper 30 mentioned above, and is made into the state integrated with this.
The first cable 40 having the above configuration is pulled by the lower end of the inner member 41 being pulled downward by the operating arm 32 </ b> A so that the lower end of the inner member 41 is pulled out from the lower end of the outer member 42.
As shown in FIG. 1, the first cable 40 has a configuration in which the inner member 41 and the outer member 42 are both flexible, such as an air conditioner disposed inside the seat back 2. Are arranged in a curved posture so as to avoid various structures (not shown).

Next, returning to FIG. 2, the second cable 50 is routed inside the headrest 4, and a relatively rigid rod-shaped inner member 51 is formed inside the outer member 52 constituted by the tubular stay 4 </ b> B. It has a double structure inserted through. In other words, the outer member 52 has its own configuration substituted by the left tubular stay 4B shown in the figure, and the configuration is omitted. Therefore, in the following description, the structure of the outer member 52 will be described using the left stay 4B.
The second cable 50 is configured as a connecting end portion in which the illustrated lower end portion is connected to the upper end portion of the first cable 40. Specifically, the lower end portion of the inner member 51 is held in a state of being hung inside the tubular stay 4B. Specifically, as shown in FIG. 4, the inner member 51 has an upper end connected to the connecting arm 15 </ b> A of the headrest moving mechanism 10, and is held in a suspended state.
Returning to FIG. 2, receiving grooves Bd and Bd extending in the axial direction from the lower end to the upper side are formed through the peripheral wall of the stay 4 </ b> B at two axially symmetrical positions. Here, in FIG. 2, the receiving grooves Bd and Bd are respectively represented by a solid line and a broken line on the left front side and the right back side of the drawing. As shown in FIG. 14, these receiving grooves Bd and Bd are formed by inserting the stay 4 </ b> B into the insertion port Sa of the support 2 </ b> S, so that the upper end of the inner member 41 of the first cable 40 held in that port. Both ends of a T-shaped engagement protrusion 41P formed on the portion can be received in the axial direction. Specifically, the stay 4B receives both ends of the engaging protrusion 41P in the receiving grooves Bd and Bd while receiving the head portion 42H of the outer member 42 of the first cable 40 in the tubular shape. Each receiving groove Bd, Bd is inserted and moved along the axial direction with the engagement protrusion 41P engaged with the stay 4B by inserting the stay 4B into the insertion port Sa of the support 2S. It is like that.

Here, referring back to FIG. 2, the receiving groove Bd on one side illustrated on the left front side of the paper surface is formed in a shape in which the axial end portion is curved toward the right direction (circumferential direction) in the paper surface. ing. The receiving groove Bd on the other side formed on the right back side is formed in a shape curved in the left direction (circumferential direction) in the drawing in a shape that is axially symmetric with the receiving groove Bd on the one side. . In other words, each of the receiving grooves Bd and Bd is formed in a shape that is curved in the opposite direction (alternating direction) in the circumferential direction with respect to each of the insertion grooves Sd and Sd described above. Here, FIG. 13 is a perspective view showing a state before the stay 4B is inserted into the support 2S, and FIG. 14 is a perspective view showing the state where the stay 4B is inserted into the support 2S. Yes. In these drawings, in order to explain the structure of the stay 4B and the support 2S in an easy-to-understand manner, they are represented in a direction different from the direction of the perspective view of FIG.
Accordingly, as shown in FIG. 14, when the stay 4B having the above-described configuration is inserted into the insertion port Sa of the support 2S, one end of the engagement protrusion 41P on the right front side of the paper is formed on the stay 4B, for example. It is pushed back in the same direction from the end portion of the insertion groove Sd in the form of being guided by the shape of the end portion bent in the right direction of the receiving groove Bd on the right front side of the sheet. Note that the other end (not shown in the figure) of the engagement protrusion 41P on the left rear side of the paper surface is pushed back from the end portion of the insertion groove Sd by a movement that is axially symmetric with the one end. Then, the engaging protrusion 41P moves to the end portions of the receiving grooves Bd and Bd by the above movement, and moves to the shape portion extending in the axial direction away from the end portions of the insertion grooves Sd and Sd. As a result, the engaging protrusion 41P is allowed to move relative to the support 2S in the axial direction (gravity direction and its opposite direction), while the stay 4B is restricted from moving in the axial direction. It will be in the state. In this state, the engagement protrusion 41P is held in an integral state in the axial direction with respect to the stay 4B due to the intersecting shape of the receiving grooves Bd, Bd and the insertion grooves Sd, Sd. Is movable only in the axial direction. That is, the upper end portion of the inner member 41 of the first cable 40 and the lower end portion of the outer member 52 (stay 4B) of the second cable 50 are axially connected by the engagement between the engagement protrusion 41P and the stay 4B. It becomes.

In the state where the shaft is connected, the stay 4B can be further inserted and moved. Therefore, as shown in FIG. 15, the stay 4 </ b> B can be inserted to the insertion position locked to the support 2 </ b> S in the above-described shaft coupling state.
Here, on the peripheral wall of the left stay 4 </ b> B shown in the drawing, a locking groove Bs having a notch shape is formed. Further, the support 2S on the left side is provided with a locking claw St urged toward the mouth of the insertion port Sa. The locking claw St is normally held in a posture protruding into the insertion port Sa, and can be pushed out of the insertion port Sa by performing an operation of pushing the knob Sb from the side. It has become. Therefore, by inserting the stay 4B into the insertion port Sa in the state where the knob Sb is pushed, and inserting the stay 4B as it is, this is automatically performed at a position where the locking claw St matches the locking groove Bs. Therefore, the movement of the stay 4B in the insertion direction can be locked. The locking grooves Bs are formed at a plurality of positions in the axial direction on the peripheral wall of the stay 4B. Therefore, the installation height position of the headrest 4 can be freely adjusted by changing the insertion amount of the stay 4B while performing the pushing operation of the knob Sb.

Similarly, the headrest 4 can be removed from the seat back 2 by pulling out the stays 4B and 4B from the supports 2S and 2S while performing the pushing operation of the knob Sb. The stay 4B and 4B are pulled out to release the shaft connection state between the upper end portion of the inner member 41 of the first cable 40 and the lower end portion of the stay 4B.
Specifically, referring to FIG. 14, when the illustrated left stay 4 </ b> B is moved in a direction to be pulled out from the insertion port Sa of the support 2 </ b> S, for example, one end of the engagement protrusion 41 </ b> P on the right front side of the paper is Contrary to the movement at the time of insertion described above, it is guided in the shape of the end portion bent to the left of the insertion groove Sd formed on the support 2S on the right front side of the paper, and in the same direction from the end portion of the guide groove. It will be pushed back to. Note that the other end (not shown in the figure) of the engagement protrusion 41P on the left rear side of the paper surface is pushed back from the end portion of the receiving groove Bd by a movement which is axially symmetric with the above-described one end. Then, the engaging protrusion 41P moves toward the end portion of the insertion grooves Sd, Sd by the above movement, and also moves to the shape portion extending away from the end portion of the receiving grooves Bd, Bd in the axial direction. As a result, the engagement protrusion 41P is in a state in which relative movement in the axial direction with respect to the stay 4B is permitted, while relative movement in the axial direction is restricted with respect to the support 2S. Thereby, the shaft connection state of the stay 4B and the first cable 40 is released, and only the stay 4B can be pulled out from the support 2S.

Here, FIG. 15 shows an internal structure in a state where the upper end portion of the inner member 41 of the first cable 40 and the lower end portion of the stay 4B are axially connected. FIG. 15 is represented as a cross-sectional view of FIG. 14 viewed from the direction cut along the line XX. As shown in the figure, in a state where both are axially connected, the lower end of the inner member 51 of the second cable 50 is located at a position slightly away from the head 42H of the outer member 42 of the first cable 40 upward. positioned. Thereby, the inner member 51 of the second cable 50 is prevented from being pushed up from below by the head portion 42H of the outer member 42 of the first cable 40 during the insertion operation of the stay 4B.
As shown in FIG. 16, the second cable 50 connected to the shaft is pushed up to the head 42 </ b> H of the outer member 42 when the inner member 41 of the first cable 40 is pulled downward. Thus, the inner member 51 is pushed upward. That is, the stay 4 </ b> B, which is the outer member 52 of the second cable 50, is axially coupled to the inner member 41 of the first cable 40 and is in an integral state. Therefore, when the inner member 41 of the first cable 40 is pulled downward in this shaft connection state, the outer member 42 is relatively pushed upward. Accordingly, the inner member 51 of the second cable 50 is pushed up from below by the head portion 42H of the outer member 42. Referring to FIG. 4, when the inner member 51 of the second cable 50 is pushed up, the connecting arm 15A is turned counterclockwise, and the holding state of the support portion 4A in the initial position is changed. Canceled.
That is, the first cable 40 has a pulling cable structure in which the inner member 41 is pulled downward, and the second cable 50 has an extrusion type cable structure in which the inner member 51 is pushed upward. It has become. In the shaft coupling structure of the first cable 40 and the second cable 50, the inner member 41 and the outer member 52 (stay 4B) are in a shaft coupling state by performing the insertion operation of the stay 4B, and the outer member 42 and the inner member 51 have a reversible shaft coupling structure in which the shaft is coupled (a state where cable operation by extrusion is possible).

Next, the usage method of a present Example is demonstrated.
That is, referring to FIG. 1, the headrest 4 is configured to be detachable from the seat back 2, and the stays 4 </ b> B and 4 </ b> B under the headrest 4 are respectively inserted into the insertion ports Sa and Sa of the supports 2 </ b> S and 2 </ b> S. By being inserted, it is mounted on the upper part of the seat back 2. Then, the first cable 40 and the second cable 50 are connected to each other by the operation of inserting the left side (right side in the drawing) stay 4B.
The seat 1 assembled as described above always holds the support portion 4A of the headrest 4 in the posture state at the initial position before the vehicle collision occurs. And if the rear surface collision of a vehicle generate | occur | produces and the backrest load which a passenger | crew's back part presses against the seat back 2 is applied, the pushing member 20 will be pushed back. As a result, the holding state of the support portion 4A is released, and the support portion 4A moves from the initial position shown in FIG. 4 to the collision corresponding position shown in FIG. And 4 A of support parts receive from the back side the passenger | crew's head which inclines backward with the momentum of a vehicle collision in this collision corresponding position.

Thus, according to the vehicle seat of the present embodiment, it is possible to prevent return to the long holes 11H and 11H (guide path) for moving and guiding the connecting shaft 13A (engagement pin) formed in the support portion 4A of the headrest 4. When the first stopper grooves H1 and H1 and the second stopper grooves H2 and H2 (stopper grooves) are set and the support portion 4A is moved in the return direction, the connecting shaft 13A is connected to the first stopper grooves H1 and H1 and the second stopper grooves. By providing the closing members 17 and 17 that can be guided so as to avoid the grooves H2 and H2, at the time of occurrence of a vehicle collision, the support portion 4A is moved halfway forward before reaching the collision corresponding position. It is possible to prevent the back side from being pushed back, and when the support part 4A is returned to the initial position before moving forward after the vehicle collision ends, the return prevention restriction should not be applied. It can be.
Further, by returning the connecting shaft 13A to the initial position, the closed state of the first stopper grooves H1 and H1 and the second stopper grooves H2 and H2 by the closing members 17 and 17 can be released. When sliding from the initial position toward the collision handling position, the connecting shaft 13A can be again received in the first stopper grooves H1, H1 and the second stopper grooves H2, H2.
Furthermore, a tension spring 16 (biasing means) for constantly urging the connecting shaft 13A toward the collision handling position, hooks 14 and 14 for engaging the connecting shaft 13A at the initial position, and an operation member 15 (engaging means) are provided. As a result, after the occurrence of a vehicle collision, the connecting shaft 13A is always positioned at the position corresponding to the collision, and the first stopper grooves H1, H1 and the second stopper grooves H2, H2 are closed by the closing members 17, 17. It is possible to smoothly return the connecting shaft 13A to the initial position.
Furthermore, the sliding movement structure of the closing members 17 and 17 can be a relatively space-saving and simple structure as a sliding movement structure that is pushed in the same direction by the connecting shaft 13A.

Although the embodiment of the present invention has been described with one embodiment, the present invention can be implemented in various forms in addition to the above-described embodiment.
For example, in the above-described embodiment, the connection shaft as the engagement pin is slid in the traveling direction by the bias when the holding state at the initial position by the hook is released. However, for example, the connecting shaft may be directly connected to the cable, and the connecting shaft may be directly moved in the traveling direction by the movement of the cable.
Further, the long hole as the guide shape may simply be a shape extending in the vertical direction of the base. However, in this case, it should be noted that the inclination posture of the support portion with respect to the base easily changes as the connecting link rotates.
Moreover, the number of stopper grooves may be one, or three or more. In this case, the closing member also needs to have a shape following each stopper groove.
In addition, although the elongate hole penetrated and formed in the side part of the base was shown as a guide shape, the groove | channel shape dented in concave shape may be sufficient.
Further, the sliding movement direction of the closing member may not be the same as the direction pushed by the engagement pin. However, the closing member needs to be disposed in a state where it is not pushed back even if it receives a pressing force from the engagement pin in a state where the stopper groove is closed.

3 is a perspective view illustrating a schematic configuration of a sheet according to Embodiment 1. FIG. It is the disassembled perspective view which expanded and represented the connection structure of a 1st cable and a 2nd cable. It is the perspective view which expanded and represented the mechanism which carries out the pulling operation of the lower end of a 1st cable. It is a side view showing the initial state of the headrest moving mechanism. It is a block diagram showing the structure which hold | maintains a headrest moving mechanism in an initial state. It is a side view showing the state in the middle of the movement to the advancing direction of a headrest moving mechanism. It is a side view showing the state where the headrest moving mechanism has finished moving in the traveling direction. FIG. 8 is a configuration diagram illustrating an intermediate state of an operation for returning the headrest moving mechanism to the initial state from the state of FIG. FIG. 9 is a configuration diagram illustrating a state in which the headrest moving mechanism is returned from the state of FIG. It is a block diagram which represented typically the state of the closing member when a connection shaft exists in an initial position. It is a block diagram which represented typically the state of the closing member when a connection shaft exists in a collision corresponding position. It is the block diagram which looked at the headrest moving mechanism from the Y line direction of FIG. It is a block diagram showing the state before inserting the stay of a headrest in the support installed in the seat back. It is a block diagram showing the state which inserted the stay of the headrest in the support installed in the seat back from the state of FIG. It is a block diagram showing the internal structure of FIG. It is a block diagram showing the state by which the 1st cable was pulled operation from the state of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat 2 Seat back 2F Back frame Fu Upper frame Fs Side frame 2S Support Sa Insertion slot Sb Knob St Locking claw Sd Insertion groove 3 Seat cushion 4 Headrest 4A Bearing part 4B Stay Bd Reception groove Bs Locking groove 10 Headrest moving mechanism 11 base 11B rear surface portion 11D bottom surface portion 11S side surface portion 11U upper surface portion 11R rib Rh1 long hole Rp1 locking portion Rh2 long hole Rp2 locking portion 11H long hole (guide path)
H0 Lower end H1 First stopper groove (stopper groove)
H2 Second stopper groove (stopper groove)
H3 Upper end 12 Link (link member)
12A connecting shaft 12B connecting shaft 13 support member 13A connecting shaft (engagement pin)
14 Hook (engagement means)
14A Connecting shaft 14B Upper jaw part 14C Lower jaw part 14D Locking groove 14S Torsion spring 15 Operation member (engaging means)
15A connecting arm 15B connecting shaft 15C operating arm 15S torsion spring 16 tension spring (biasing means)
17 Closing member 17A1 First closing portion 17A2 Second closing portion 17B1 Pin member 17B2 Pin member 17C1 First pushing portion (pushing portion)
17C2 Second pushing part (pushing part)
DESCRIPTION OF SYMBOLS 20 Pushing member 20S Torsion spring 21 Receiving arm 30 Damper 31 Rotating shaft 31A Connection arm 32 Case 32A Operation arm 40 1st cable 41 Inner member 41P Engagement protrusion 42 Outer member 42S Long hole 42H Head 50 Second cable 51 Inner member 52 Outer member 60 Mounting bracket 61 Outer mounting part 62 Stopper

Claims (4)

A vehicle seat provided with a headrest moving mechanism capable of moving a support portion of a headrest that receives a head of an occupant seated on a seat relative to a seatback at the time of a vehicle collision,
The headrest moving mechanism is
A link member that links both the support portion of the headrest and the base installed on the upper portion of the seat back, and enables the support portion to rotate around a shaft support position linked to the base;
In order to position the position of the support portion in association with the rotation of the support portion by the link connection of the link member, it is formed on the side surface portion of the base and protrudes in the width direction formed integrally with the support portion. A concave guide path that guides the engaging pin while being slidably moved in accordance with the rotation of the support portion.
The guide path is moved upward to a collision-corresponding position moved relatively forward and upward from a normal initial position before a vehicle collision occurs with the rotation of the support portion. A stopper groove having a partially depressed shape is formed in a part of the guide path in the middle of the guide path, and the stopper pin is formed in the guide path when a vehicle collision occurs. A shape that can receive the engagement pin and receive the load when the support portion receives a receiving load that receives the head of the occupant during the sliding movement from the initial position to the collision corresponding position along Has been
The base has an avoidance moving means capable of moving the engagement pin while avoiding the stopper groove when the engagement pin slides on the guide path from the collision corresponding position toward the initial position. Provided,
The avoidance moving means is a closing member capable of closing a stopper groove formed in the guide path by sliding movement, and the closing member is an initial stage at a normal time before the engagement pin occurs in a vehicle collision. In the position state, it is in a position state deviating from the stopper groove, but the stopper pin is closed by sliding to the position where the stopper groove is closed by the sliding movement of the engagement pin to the collision corresponding position, and the stopper groove is closed. The vehicle seat according to claim 1, wherein the engagement pin is disposed with respect to the base so that the engagement pin slides from the collision corresponding position toward the initial position in the state. The vehicle seat according to claim 1,
In the closed state of the stopper groove by the closing member, when the guide pin is slid from the collision corresponding position to the initial position, the stopper groove is closed by the sliding movement to the initial position. The vehicle seat, wherein the closing member is disposed with respect to a base so as to be released again. The vehicle seat according to claim 2,
The engagement pin is provided with a biasing means for constantly biasing the engagement pin toward the collision-corresponding position, and when the engagement pin is in the initial position state, the engagement pin is engaged with the position. A vehicular seat characterized in that an engaging means capable of being attached is attached. The vehicle seat according to claim 2 or 3,
In the sliding movement structure of the closing member, the closing member is slidably engaged with a long hole formed in the base, and the two pushing portions formed in the closing member are It is arranged so as to protrude into the guide path so as to sandwich the engaging pin therebetween, and each of the pushing parts is pushed by the movement of the engaging pin sliding to the initial position and the collision-corresponding position. A vehicle seat characterized in that a member slides in the same direction as the engagement pin.

Images