JP2008056088A - Vehicle seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To compactly compose a mechanism for detecting behavior change of an occupant sitting in a seat at the time of a rear-end collision of a vehicle as a mechanical operation moving quantity to be transmitted to a headrest moving mechanism. <P>SOLUTION: The device is provided with a cable operation mechanism 20 to detect action change of the occupant sitting in the seat 1 at the time of a rear-end collision of a vehicle as a mechanical operation moving quantity, and the headrest moving mechanism 10 for moving a support part 4A of a headrest 4 to move to approach the head part as the detected moving quantity is transmitted through cable operation of a first cable 40 and a second cable 50. The cable operation mechanism 20 comprises a pushing member 21 to receive the load of an occupant on a backrest at the time of a rear-end collision of the vehicle to rotate, and a pulley 24 coaxially and integrally rotatably disposed with it to lock a lower end of an inner member 41 of the first cable 40 while simultaneously pulling the lower end of the inner member 41 along the outer circumference. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle seat. More specifically, the present invention relates to a vehicle seat that detects a change in behavior of an occupant seated on a seat at the time of a rear-end collision and moves a support portion of a headrest that receives the occupant's head relative to the head.

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 related to a headrest moving mechanism that moves 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 the initial state in which the support portion is retracted to the headrest base side before the vehicle rear-end collision occurs. When the rearward collision of the vehicle occurs, the above holding state is released, and the support portion moves forward while the two links are rotated by the urging force.
By the way, the operation of releasing the holding state of the headrest moving mechanism described above is performed by cable operation of a cable that is tow-operated at the time of rearward collision of the vehicle. This cable is routed inside the seat back at the end on the operation side to be pulled. The end portion routed inside the seat back is connected to a pushing member that is pushed and moved by receiving the backrest load of the occupant at the time of rearward collision of the vehicle, and is pulled. Here, the pushing member has a configuration in which a plate-like receiving portion that receives the back portion of the occupant is pivotally supported inside the seat back so as to be swingable. The push member is formed with an arm portion for connecting the end portions on the operation side of the cable. The arm portion is formed in such a manner that the arm extends rearward from the shaft support portion of the pushing member, and the end portion of the cable is connected to the rear end portion. As a result, the arm portion pulls the end portion of the cable in accordance with the movement of the pushing member that is pushed rearward about the shaft support portion.
JP 2005-104259 A

  However, in the above-described conventional disclosed technique, in order to cause the cable to be pulled and pulled by the movement of the pushing member, the swing radius of the arm portion, that is, the length of the extension from the shaft support portion to the rear side. It is necessary to take longer. Therefore, the installation space in the front-rear direction of the pushing member is increased.

  The present invention was devised to solve the above-described problems, and the problem to be solved by the present invention is that the change in behavior of a passenger seated on a seat at the time of a rear-end collision is used as a mechanical operation movement amount. A mechanism for detecting and transmitting the headrest moving mechanism to the headrest moving mechanism can be made compact.

In order to solve the above problems, the vehicle seat of the present invention takes the following means.
First, the first invention is for a vehicle that detects a change in the behavior of an occupant seated on a seat at the time of a vehicle rear-end collision and relatively moves a support portion of a headrest that receives the occupant's head so as to be close to the head. A detection device at the time of a vehicle rear collision that detects a change in the behavior of an occupant seated on the seat at the time of a vehicle rear collision as a mechanical operation movement amount, and a mechanical operation detected by the detection device at the time of the vehicle rear collision And a headrest moving mechanism capable of moving the amount of movement through a mechanical transmission mechanism of the cable and relatively moving the support portion of the headrest closer to the head. The detection device at the time of rear-end collision of the vehicle is pivotally supported inside the shape of the seat back and is rotated by a change in behavior of the occupant seated on the seat at the time of rear-end collision. A pulley that is coaxially and integrally rotatable with the moving member, and that locks one end of the cable as a mechanical transmission mechanism and pulls the cable along the outer periphery during rotation.
According to the first aspect of the present invention, when the pushing member is rotated by the occurrence of the rear collision of the vehicle, one end of the cable is pulled by the pulley that rotates integrally therewith. Specifically, the cable is pulled by being wound around the outer periphery of a pulley that rotates at a position on the coaxial core with the pushing member. Then, this cable operating force is transmitted to the headrest moving mechanism, and the headrest support portion moves relative to the occupant's head.

Next, according to a second aspect, in the first aspect described above, the shaft member of the pulley is pivotally supported and attached to a support member fixed to a back frame forming a skeleton of the seat back. . The cable has a double structure in which a linear inner member is inserted in an axial direction inside a tubular outer member, and one end of the inner member is fixedly attached to a pulley. Are attached together to a support that pivotally supports the shaft member of the pulley.
According to the second invention, the shaft member of the pulley is pivotally supported with respect to the back frame by the support fixed to the back frame, and one end of the outer member of the cable is attached to the back frame. It is done. As a result, variation in the extension of the inner member exposed between the pulley integrated with the shaft member and one end of the outer member is suppressed.

The present invention can obtain the following effects by taking the above-described means.
First, according to the first aspect of the present invention, by winding the one end of the cable along the outer periphery of the pulley that rotates integrally with the pressing member, A lot of cables can be pulled without lengthening the arm to pull the cable. Therefore, a mechanism for detecting a change in behavior of an occupant seated on a seat at the time of a rear-end collision as a mechanical operation movement amount and transmitting it to the headrest movement mechanism can be configured in a compact manner.
Furthermore, according to the second aspect of the invention, the shaft member is pivotally supported with respect to the support fixed to the back frame, and the one end of the outer member of the cable is attached. Thus, the number of parts can be reduced, and variations in the extension of the inner member can be suppressed.

  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. 1-15, 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, when the above-mentioned collision occurs, the support portion 4A can be moved closer to the back of the back of the head with respect to the occupant who is 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. 5, the external appearance of the headrest moving mechanism 10 is represented by a perspective view. As shown in the figure, the headrest moving mechanism 10 keeps the support portion 4A in the initial state posture state in a state where 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. 5, 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 (corresponding to the cable of the present invention) connected to the headrest moving mechanism 10. . The second cable 50 is routed inside the headrest 4 and, as shown in FIG. 1, the first cable 40 (corresponding to the cable of the present invention) routed inside the seat back 2. It is connected to the shaft. 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 the cable operating mechanism 20 that pulls the first cable 40 when the vehicle collides.
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 cable operating mechanism 20 that pulls the lower end of the first cable 40 is shown in an enlarged view by a perspective view. As shown in the figure, a cable operating mechanism 20 for pulling the lower end side of the first cable 40 is disposed inside the seat back 2 at the center of the lower abdomen. Here, the cable operating mechanism 20 corresponds to the vehicle rear-end collision detection device of the present invention.
The cable operating mechanism 20 is integrally connected to a plate-like pushing member 21, two shaft members 22 and 23 for supporting the pushing member 21, and a shaft member 23 on one side thereof. And a pulley 24.
Specifically, the pusher member 21 is integrally connected to the respective shaft members 22 and 23 by welding the respective leg portions 21A and 21A formed so as to hang from both side portions in the width direction. .
Here, the shaft member 22 disposed on the right front side in the drawing in FIG. 3 is formed shorter than the shaft member 23 on the other side. The short shaft member 22 is integrated with a head portion 22A formed at the left end of the short shaft member 22 and a left leg portion 21A in the drawing. The right end portion of the shaft member 22 is inserted into the shaft support hole 61A of the right side surface portion 61 of the support bracket 60 formed in a “U” -shaped bent plate shape fixed to the back frame 2F. It is pivotally supported by this. A bush 22 </ b> B for positioning the insertion position is fitted into the insertion portion of the shaft member 22. Here, the support bracket 60 is fixed integrally with a reinforcing plate Ft that is spanned and fixed between the side frames Fs and Fs of the back frame 2F. Further, the long shaft member 23 on the other side has a right end portion inserted into a shaft support hole 62A of the side surface portion 62 on the left side of the support bracket 60 and is pivotally supported by the shaft support hole 62A. The shaft member 23 is integrated with a leg portion 21A, which is slightly left of the right end portion supported by the shaft. The left end portion of the shaft member 23 is inserted into a shaft support hole 32 of a bent plate-like mounting bracket 30 (corresponding to the support of the present invention) fixed to the left side frame Fs in the drawing. It is pivotally supported by this. Bushes 23 </ b> B and 23 </ b> C for positioning the insertion positions are fitted into the respective insertion portions of the shaft member 23.
Thereby, the two shaft members 22 and 23 are pivotally supported so as to be rotatable at a coaxial position with respect to the back frame 2F.

Here, in FIG. 4, a connection structure between the left end portion of the shaft member 23 and the mounting bracket 30 is shown in an exploded perspective view. As shown in the figure, a shaft piece having a polygonal cross section is integrally inserted in the axial direction at the left end portion of the shaft member 23, and the left end portion is formed as a polygonal fitting portion 23A. Yes. A pulley 24 having the same polygonal shaft hole is inserted into the polygonal fitting portion 23A in the axial direction, and is coaxially connected to the pulley 24 in a rotating direction. An engagement pin 25 that can restrict the movement of the pulley 24 in the axial direction is inserted through the polygonal fitting portion 23A in the radial direction. The engagement pin 25 is formed by bending a linear wire into an R shape, and the straight line portion is inserted into the fitting portion 23A, whereby the curved portion is formed on the outer periphery of the fitting portion 23A. It is elastically fitted and locked to it. Here, the pulley 24 is formed in an axisymmetric shape in which an outer peripheral surface 24A forms a cylindrical shape.
With the above configuration, as shown in FIG. 3, the pushing member 21 and the pulley 24 are pivotally supported by the shaft members 22 and 23 so as to be rotatable coaxially and integrally with each other.

The pushing member 21 configured as described above is rotated in such a manner that the occupant seated on the seat 1 receives a backrest load that presses against the seat back 2 at the time of a rear-end collision of the vehicle, and is pushed backward. Thereby, the pulley 24 also rotates integrally with the pushing member 21 in the same direction.
Here, as shown in FIG. 3, the lower end side of the inner member 41 of the first cable 40 is locked and attached to the inner attachment portion 24 </ b> B formed on the outer peripheral surface 24 </ b> A of the pulley 24. Specifically, the inner member 41 is attached to the inner side of the pulley 24 through the back side of the sheet, that is, the rear side of the pulley 24. Then, the lower end portion of the outer member 42 is fitted into the outer mounting portion 31 of the mounting bracket 30 fixed to the side frame Fs described above, thereby being held in an integral state in the axial direction. . Therefore, when the pushing member 21 is pushed backward and rotated, the lower end of the inner member 41 is pulled downward in a manner that the lower end is wound around the outer peripheral surface 24A of the pulley 24. Accordingly, as described above with reference to FIG. 5, 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.
That is, the cable operating mechanism 20 detects a change in the behavior of an occupant seated on the seat 1 at the time of a rear collision of the vehicle (behavior change in which the back is pressed against the seat back 2) as a mechanical operation movement amount, and this movement amount. Is transmitted to the headrest moving mechanism 10 via a cable mechanical transmission mechanism including the first cable 40 and the second cable 50.

Next, the headrest moving mechanism 10 will be described. Although the configuration of the headrest moving mechanism 10 is shown in FIGS. 5 to 11, since the state of FIG. 8 well represents the configuration of each unit, the configuration of each unit will be described below using FIG. 8. .
That is, as shown in FIG. 8, the headrest moving mechanism 10 includes a base 11, a pair of connection links 12, 12, a pair of support members 13, 13, a pair of hooks 14, 14, and an operation member 15. And a tension spring 16 and a pair of avoidance guide lever members 17 and 17.
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. 11 illustrates a configuration diagram of the headrest moving mechanism 10 as viewed from the X-ray direction of FIG. 8. 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. 8, the upper end portions 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 fixed integrally. 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, elongated holes 11H and 11H that are pierced in a wave shape are formed in the both 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.

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. 11, the rear ends of the connecting links 12, 12 are formed by left and right side surfaces 11 </ b> S, 11 </ b> S formed on the base 11 and 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. 8, the connecting links 12 and 12 are connected so that their front ends are pivotable by a connecting shaft 12 </ b> B extending in the width direction connected to the rear side portion of the support portion 4 </ b> A. . 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. 5 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. Specifically, as shown in FIG. 11, 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 by, and is connected with 13 A of connecting shafts. Here, referring back to FIG. 8, the connecting shaft 13A is disposed in a direction parallel to each of the connecting shafts 12A and 12B described above, and is a long hole 11H formed in both side surface portions 11S and 11S of the base 11. , 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. 11) formed in the base 11 is formed in the shape which does not interfere with the connection shaft 13A which moves the inside of the long holes 11H, 11H.

  Next, as shown in FIG. 6, 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. 11, the hooks 14 and 14 are sandwiched between the left and right side surfaces 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, returning to FIG. 6, torsion springs 14 </ b> S and 14 </ b> S are respectively hung between the hooks 14 and 14 and the base 11. 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 pre-twisted state, and urges 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. 5 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. 6) and urged and rotated counterclockwise, as shown in FIG. 14B is 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. 7, the hooks 14 and 14 having the above-described configuration perform an operation of dropping the connecting shaft 13A connected to the supporting 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. 5, the connecting shaft 13A is moved 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. 6, 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. 5, 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. 5, 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. 5 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. 6, the operating 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. 5, the tension spring 16 includes a connecting shaft 12 </ b> A that connects the rear ends of the connecting links 12 and 12 and the base 11, and a connecting shaft that connects the rear ends of the support members 13 and 13. 13A. The tension spring 16 urges the connecting shaft 13A toward the connecting shaft 12A, and the connecting shaft 13A (see FIG. 5) held in the lower end portions H0 and H0 of the long holes 11H and 11H is the upper end portion. 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. 5 while the connection links 12 and 12 are rotated.

Here, at the time of occurrence of the above-described vehicle collision, 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. 7, 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. 5, the pair of avoidance guide lever members 17 and 17 are made of synthetic resin, and the rear ends thereof are pivotally supported by the portion near the upper end of the base 11 in the width direction. Are arranged side by side. As shown in FIG. 11, the avoidance guide lever members 17 and 17 have ribs 11 </ b> R and 11 </ b> R formed on the outside of the base 11 and ribs 11 </ b> R and 11 </ b> R formed on the inside thereof. Are respectively connected to the connecting shafts 17A and 17A extending in the width direction and penetrating therebetween. Thereby, the avoidance guide lever members 17 and 17 are supported so as to be pivotable with respect to the base 11.
Here, returning to FIG. 5, torsion springs 17 </ b> S and 17 </ b> S are respectively hung between the avoidance guide lever members 17 and 17 and the base 11. These torsion springs 17S and 17S are provided in the form of being wound around the connecting shafts 17A and 17A, respectively. One end of the torsion springs 17S and 17S is hooked on the avoidance guide lever members 17 and 17, and the other end is hooked on the base 11. I wear it. Thereby, the torsion springs 17S and 17S hold the avoidance guide lever members 17 and 17 in the posture state of FIG. 5 in their free state. That is, the front end portions of the avoidance guide lever members 17 and 17 are held in a posture state where they are exposed in the long holes 11H and 11H. Here, the avoidance guide lever members 17 and 17 are formed with spoon-shaped receiving portions 17B and 17B at the front end portions thereof. The avoidance guide lever members 17 and 17 are normally held in a posture in which the spoon-shaped receiving portions 17B and 17B are exposed in the holes 11H and 11H, respectively.

The avoidance guide lever members 17 and 17 move upward in the long holes 11H and 11H when the support portion 4A moves in the advancing direction from the initial position shown in FIG. 5 to the collision corresponding position shown in FIG. It is designed to be pushed away from the bottom by being pushed up from below by the connecting shaft 13A. Specifically, as shown in FIG. 7, the avoidance guide lever members 17 and 17 are once pushed clockwise by the connecting shaft 13A that moves upward. As shown in FIG. 8, when the connecting shaft 13A reaches the upper end portions H3 and H3 of the long holes 11H and 11H, the avoidance guide lever members 17 and 17 are separated from the contact with the connecting shaft 13A. Due to the force, the posture is returned to the state before being pushed.
However, as shown in FIG. 9, the avoidance guide lever members 17 and 17 are connecting shafts that move downward in the long holes 11H and 11H when the support portion 4A is returned from the collision corresponding position to the initial position. 13A is received by spoon-shaped receiving portions 17B and 17B formed at the front end portion. Then, by moving the support portion 4A toward the initial position in this receiving state, the avoidance guide lever members 17 and 17 are counterclockwise in the paper plane while being guided by the connecting shaft 13A while being pushed and moved. To turn. As shown in FIG. 10, the avoidance guide lever members 17 and 17 move and guide the connecting shaft 13A to the vicinity of the lower end portions H0 and H0 of the long holes 11H and 11H, and then come into contact with the connecting shaft 13A. Come off. That is, in the avoidance guide lever members 17 and 17, the connecting shaft 13A enters the first stopper grooves H1 and H1 and the second stopper grooves H2 and H2 of the long holes 11H and 11H during the operation of returning the support portion 4A to the initial position. This is guided so as not to move, and assists so that the support portion 4A can be smoothly returned to the initial position.

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 engagement protrusion 41P can be inserted to the end portions of the insertion grooves Sd and Sd (see FIG. 12). 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 the outer mounting portion 31 of the mounting bracket 30 fixed to the side frame Fs. And the lower end part of the inner member 41 is connected with the inner attachment site | part 24B of the pulley 24 mentioned above.
Therefore, the first cable 40 having the above-described configuration has the lower end of the outer member 42 held at a fixed position by being pulled downward by winding the lower end of the inner member 41 around the outer peripheral surface 24A of the pulley 24. The lower end of the inner member 41 is pulled out from above.
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. 5, 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. 13, these receiving grooves Bd, Bd are formed by inserting the stay 4B into the insertion port Sa of the support 2S, thereby allowing the upper end of the inner member 41 of the first cable 40 held in the 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 of the receiving grooves Bd and Bd is inserted and moved along the axial direction in a state in which the engagement protrusion 41P is 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. 12 is a perspective view showing a state before the stay 4B is inserted into the support 2S, and FIG. 13 is a perspective view showing a 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.
Therefore, as shown in FIG. 13, when the stay 4B having the above configuration is inserted into the insertion port Sa of the support 2S, for example, one end of the engagement protrusion 41P on the right front side of the paper surface is formed on the stay 4B. 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. 14, 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. 13, when the left stay 4B shown in the drawing is moved in a direction to be pulled out from the insertion port Sa of the support 2S, for example, one end of the engagement protrusion 41P 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. 14 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. 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. 15, the second cable 50 connected to the shaft is pushed up to the head 42 </ b> H of the outer member 42 by pulling the inner member 41 of the first cable 40 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. Then, referring to FIG. 5, when the inner member 51 of the second cable 50 is pushed up, the connecting arm 15A is turned counterclockwise, and the holding portion 4A is held in the initial position. 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 openings 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 axially connected 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. Then, when a rear collision of the vehicle occurs and a backrest load is applied to the seat back 2 against the back of the occupant, the pushing member 20 is pushed rearward. 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. 5 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, the lower end of the cable (the inner member 41 of the first cable 40) along the outer peripheral surface 24A of the pulley 24 that rotates integrally with the pushing member 21. With the configuration in which the cable is wound, the cable can be pulled a lot with respect to the rotation of the pushing member 21 without lengthening the arm for pulling the cable. Therefore, the cable operation mechanism 20 that detects the change in the behavior of the occupant seated on the seat 1 at the time of the rear-end collision as a mechanical operation movement amount and transmits it to the headrest movement mechanism 10 can be made compact. Furthermore, the shaft member 23 is pivotally supported with respect to the mounting bracket 30 fixed to the back frame 2F, and the lower end of the outer member 42 of the first cable 40 is attached, so that the configuration is made into one part. The number of parts can be reduced by rationalization, and variations in the amount of the inner member 41 exposed between the pulley 24 and the lower end of the outer member 42 can be suppressed.

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 embodiment, the pulley is formed in an axially symmetric shape whose outer peripheral surface forms a cylindrical shape. However, the pulley has a shape biased with respect to the central axis such as a cam shape or an asymmetric polygonal shape. It may be formed.
In addition, the mounting bracket corresponding to the support tool of the present invention is configured as a shared part that pivotally supports the shaft member of the pulley so that the lower end of the outer member of the first cable can be mounted. These may be constituted by separate parts.
Further, the pulley that winds and pulls one end of the cable can also be constituted by the shaft member itself that rotates integrally with the pushing member. That is, the specific structure is not particularly limited as long as one end of the cable is locked and the cable is pulled along the outer periphery during rotation.

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 cable operation mechanism which carries out pulling operation of the lower end of a 1st cable. FIG. 4 is an exploded perspective view of the component shown in FIG. 3. 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. It is a block diagram showing the intermediate state of operation which returns a headrest moving mechanism to the initial state from the state of FIG. FIG. 10 is a configuration diagram showing a state in which the headrest moving mechanism is returned from the state of FIG. 9 to the initial state while being guided. It is the block diagram which looked at the headrest moving mechanism from the X-ray 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 Ft Reinforcement board 2S Support Sa Insertion slot Sb Knob St Locking claw Sd Insertion groove 3 Seat cushion 4 Headrest 4A Support 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 11H Long hole H0 Lower end portion H1 First stopper groove H2 Second stopper groove H3 Upper end portion 12 Connection link 12A Connection shaft 12B Connection shaft 13 Support Member 13A Connection shaft 14 Hook 14A Connection shaft 14B Upper jaw portion 14C Lower jaw portion 14D Locking groove 14S Torsion spring 15 Operation member 15A Connection arm 15B Connection shaft 15C Operation arm 15S Torsion spring 16 Tension spring 17 Avoidance guide lever member 17 A connecting shaft 17B receiving portion 17S torsion spring 20 cable operating mechanism (detection device at the time of rear collision of vehicle)
21 Pushing member 21A Leg portion 22 Shaft member 22A Head portion 22B Bushing 23 Shaft member 23A Fitting portion 23B Bushing 23C Bushing 24 Pulley 24A Outer peripheral surface 24B Inner mounting portion 25 Engaging pin 30 Mounting bracket (support)
31 Outer mounting portion 32 Shaft support hole 40 First cable (cable)
41 inner member 41P engaging protrusion 42 outer member 42S long hole 42H head 50 second cable (cable)
51 Inner member 52 Outer member 60 Support bracket 61 Side surface portion 61A Shaft support hole 62 Side surface portion 62A Shaft support hole

Claims (2)

A vehicle seat that detects a change in behavior of an occupant seated on a seat at the time of a rear collision of the vehicle and moves the support portion of a headrest that receives the occupant's head relative to the head,
A detection device at the time of a vehicle rear impact that detects a change in the behavior of an occupant seated on a seat at the time of a vehicle rear impact as a mechanical operation movement amount;
The amount of movement of the mechanical operation detected by the detection device at the time of rearward collision of the vehicle is transmitted through the mechanical transmission mechanism of the cable, and the support portion of the headrest can be relatively moved so as to be close to the head. A headrest moving mechanism,
The detection device at the time of the rear collision of the vehicle,
A pushing member that is pivotally supported inside the shape of the seat back and is rotated in accordance with a behavior change at the time of a vehicle rear collision of an occupant seated on the seat;
A pulley that is coaxially and integrally rotatable with the pusher member, and that locks one end of the cable as a mechanical transmission mechanism and pulls the cable along the outer periphery during rotation. A vehicle seat characterized by that. The vehicle seat according to claim 1,
The shaft member of the pulley is pivotally supported and attached to a support fixed to a back frame forming the skeleton of the seat back.
The cable has a double structure in which a linear inner member is inserted in an axial direction inside a tubular outer member, and one end of the inner member is locked and attached to the pulley. A vehicle seat characterized in that one end of each member is attached to a support that pivotally supports a shaft member of the pulley.

Images