JP2008201234A - Vehicular seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably operate a cable by a pressure receiving member by easily applying the backrest load of a seated person to the pressure receiving member arranged in a seat back and functions as a trigger for actuating and operating a headrest upon rear-end collision of a vehicle. <P>SOLUTION: This vehicular seat 1 has a vehicle rear-end collision detecting device 20 arranged in the seat back 2, and a headrest moving mechanism 10. The detecting device 20 detects a vehicle rear-end collision by a mechanical operational moving distance pushed by the backrest load of the seated person. The detecting device 20 actuates the head rest moving mechanism 10 by pushing the pressure receiving member 21 by the backrest load to operate an operating cable 40. A formed wire 2C arranged for elastically catching the normal backrest load of the seated person is connected to the pressure receiving member 21. A compression spring elastically deformed by receiving the normal backrest load of the seated person is interposed in the power transmission passage of the detecting device 20 for receiving transmission of catching force from the formed wire 2C. <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 can move a support portion of a headrest that receives a head of a seated person when a rearward collision of the vehicle is detected to be close to the head.

2. Description of the Related Art Conventionally, there is a vehicle seat that employs a mechanism that supports a headrest by moving the headrest instantaneously forward to prevent backward tilt of a seated person when a vehicle rear collision is predicted or detected. . For example, Patent Document 1 below discloses a technique in which a headrest can be instantaneously moved forward using a movement of a back of a seated person against a seat back as a trigger when a vehicle rear-end collision occurs.
In this disclosure, a pressure receiving member that is pushed by receiving a pressing force from the back of the seated person is disposed inside the seat back. The pressure receiving member is connected to one end of an operation cable. The operation cable is pulled with the pushed movement, and the holding state at the initial position of the headrest can be released. .
JP 2006-56358 A

  However, in the related art disclosed above, the spring force of the cushion spring disposed inside the seat back becomes a resistance force, and the pressure receiving member is hardly pushed. That is, in this disclosed technique, a contour mat for elastically receiving a seated person's backrest load is disposed on the entire surface of the backrest inside the seat back. The contour mat is provided in a state in which a peripheral edge portion thereof is elastically suspended from the skeleton frame of the seat back by a plurality of spring members. Therefore, the pressing operation of the pressure receiving member at the time of rearward collision of the vehicle is performed against the spring force of the spring member that elastically supports the contour mat with respect to the skeleton frame. Therefore, unless a large backrest load is applied to the seat back, a sufficient pressing force cannot be transmitted to the pressure receiving member, and stable cable operation by the pressure receiving member cannot be performed.

  The present invention has been devised to solve the above-described problems, and the problem to be solved by the present invention is to provide a seat back provided as a trigger for operating a headrest when a vehicle rear-end collision occurs. An object of the present invention is to make it easier for a seater's backrest load to be applied to the inner pressure receiving member so that stable cable operation is performed by the pressure receiving member.

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 capable of moving a support portion of a headrest that receives a seated person's head when a vehicle rear-end collision is detected to move the headrest relative to the seat back so as to be close to the head. is there. The vehicle seat includes a vehicle rear-end collision detection device provided in a seat back and a headrest moving mechanism. The detection device at the time of a vehicle rear-end collision is pushed by the backrest load of the occupant who presses against the seat back when the vehicle rear-end collision occurs, thereby detecting the occurrence of the vehicle rear-end collision. It can be detected as an operation movement amount. The headrest moving mechanism brings the support portion of the headrest close to the head by receiving the transmission of the mechanical operation movement amount at the time of rear-end collision of the vehicle via the mechanical transmission mechanism by the operation cable connected to the detection device. Can be moved relative to each other. The detection device at the time of a rear collision of the vehicle operates the operation cable by a movement of the pressure receiving member disposed in the seat back being pushed by the backrest load of the seated person. The operation cable has an end on the operated side connected to a portion that moves together with the pressure receiving member. In the seat back, a receiving member for elastically receiving a seated person's normal backrest load is provided in a state of being connected to the pressure receiving member. Furthermore, the power receiving path through which the receiving force is transmitted when the receiving member receives the seater's backrest load and the power transmission path via the operation cable are subjected to a normal seater's backrest load. A spring member that is elastically deformed is interposed. The receiving force for the receiving member to elastically receive the backrest load of the seated person at normal time is configured to be secured by the spring force of the spring member.
According to the first aspect of the present invention, when a backrest load of the seated person is applied to the receiving member provided in the seat back at the time of occurrence of the rear collision, the pressure receiving member is pushed by this and the operation cable is operated. The As a result, the headrest moving mechanism is operated and operated via the operation cable, and the headrest supporting portion moves relative to the head so as to approach the head. Normally, the operation cable is not operated even when the pressure receiving member is pushed by receiving the backrest load of the seated person. Specifically, the power transmission path of the receiving force when the receiving member receives the seated backrest load is provided with a spring member that is elastically deformed by receiving the seated backrest load at the normal time. It has been. As a result, the amount of mechanical operation that the pressure receiving member is normally pushed is absorbed by the elastic deformation of the spring member, so that the operation cable is maintained in an unoperated state. In this state, the receiving force of the receiving member for elastically receiving the seated person's backrest load is secured by the spring force of the spring member. When a rearward collision of the vehicle occurs, the operation cable is operated via the spring member by the pressure receiving member being largely pushed by a large backrest load with a spring applied to the receiving member.

Next, according to a second aspect, in the first aspect described above, the spring member is provided so as to be interposed in a connecting portion between the pressure receiving member and the operation cable.
According to the second aspect of the present invention, the receiving force of the receiving member that elastically receives the backrest load of the seated person at the normal time is provided by the spring member interposed between the connecting portion of the pressure receiving member and the operation cable. Secured by.

Next, according to a third aspect, in the first or second aspect described above, the connection structure of the operation cable is provided as a slide member that is slidable in a plane direction perpendicular to the pressing direction of the pressure receiving member. In addition, the end portion on the side where the operation cable is operated is connected. The slide member and the pressure receiving member are linked to each other via a parallel link. The pressure receiving member is pushed by the backrest load of the seated person while maintaining a parallel posture state with respect to the slide member.
According to the third aspect of the present invention, the slide member connected to the pressure receiving member via the parallel link is moved in accordance with the movement of the pressure receiving member that receives the backrest load of the seated person at the time of rearward collision of the vehicle. Slides in a vertical plane. Thereby, the operation-side end portion of the operation cable connected to the slide member is operated. At this time, since the pressure receiving member is pushed while maintaining the posture state parallel to the slide member, the posture direction of the receiving member connected thereto is also maintained in the same posture direction. Accordingly, the backrest load of the seated person can be stably received by the receiving member from time to time, and the slide member linked to the pressure receiving member can slide stably from time to time.

Next, according to a fourth aspect of the present invention, in any one of the first to third aspects described above, in the operation cable, an inner member capable of being pulled or pushed is inserted axially into the tubular outer member. It has a double structure. The inner member and the outer member are respectively connected at their operated end portions to an inner slide member or an outer slide member linked to the pressure receiving member. When the pressure receiving member is pushed, the inner side sliding member and the outer side sliding member slide on the surfaces perpendicular to the pushing direction of the pressure receiving member in linear directions that are opposite to each other. And the outer end of the operation side of the outer member are operated in directions to approach or separate from each other.
According to the fourth aspect of the present invention, when the pressure receiving member is pushed during the rear-end collision of the vehicle, the inner side slide member and the outer side slide member are slid in the linear directions that are opposite to each other. As a result, the end portions on the operation side of the inner member and the outer member are operated in directions toward or away from each other.

The present invention can obtain the following effects by taking the above-described means.
First, according to the first invention, the receiving member that receives the backrest load of the seated person is elastically supported in the power transmission path via the pressure receiving member and the operation cable, not to the skeleton frame of the seat back. The backrest load applied to the receiving member can be directly applied as a pressing force for pushing the pressure receiving member. Therefore, stable cable operation by the pressure-receiving member is performed so that the back-loading load of the seated person is easily applied to the pressure-receiving member in the seat back provided as a trigger for operating the headrest when the rear collision of the vehicle occurs. It can be made to be.
Furthermore, according to the second aspect of the present invention, the spring member is provided at the connecting portion between the operation cable that can be moved only in the axial direction and the pressure receiving member, so that the operation of the receiving member, the pressure receiving member, and the operation cable can be performed. The spring member can be set without making it unstable.
Furthermore, according to the third invention, the pressure-receiving member connected to the receiving member and the slide member are linked to each other via the parallel link, so that the backrest load of the seated person can be applied to the same posture from the beginning to the end by the receiving member. In addition, the slide member can be stably slid from end to end by the pressure receiving member, and the operation cable can be stably operated.
Furthermore, according to the fourth invention, the operation side ends of the inner member and the outer member of the double-structure operation cable are operated in a direction to approach or separate from each other when the pressure receiving member is pushed. As a result, the operation cable can be pushed or pulled efficiently with respect to the mechanical operation movement amount by which the pressure receiving member is pushed.

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

First, the configuration of the first embodiment will be described with reference to FIGS.
Here, in FIG. 1, the overall configuration of the vehicle seat 1 is schematically represented by a perspective view. As shown in FIG. 1, the vehicle seat 1 includes a seat back 2 that serves as a backrest portion of a seated person, a seat cushion 3 that serves as a seating portion, and a headrest 4 that receives the head. In each drawing such as FIG. 1, the skin structure is omitted for easy understanding of the internal structure of the seat back 2 and the headrest 4.
The headrest 4 has two rod-like stays 4B, 4B erected at the lower part thereof, which are respectively inserted into insertion holes Sa of cylindrical supports 2S, 2S provided on the upper surface of the seat back 2. Thus, it is mounted on the upper surface portion of the seat back 2. The supports 2S and 2S are integrally fixed to an upper frame Fu that is an upper arm portion of the back frame 2F that forms the skeleton of the seat back 2. Here, the upper frame Fu is integrally rigidly coupled to the side frames Fs and Fs so as to connect the upper ends of the side frames Fs and Fs.
The headrest 4 is normally held in the installed position so that the head of the seated person can be received at the position on the rear side. However, the headrest 4 is configured such that the front-side support portion 4A that receives the head of the headrest 4 instantaneously moves forward and approaches the head when a rearward collision of the vehicle occurs. That is, only the support portion 4A moves closer to the back of the back of the head with respect to a seated person who is in a posture that floats forward from the seat back 2 or the headrest 4 when a rear collision occurs. Thereby, the backward tilting of the head when a rear collision occurs can be stopped early, and the load applied to the neck can be reduced to prevent whipping.

The operation of moving the support portion 4 </ b> A forward when a rear collision occurs is performed by the headrest moving mechanism 10 incorporated in the headrest 4. As shown well in FIG. 12, the headrest moving mechanism 10 keeps the headrest moving mechanism 10 in the initial state posture state as a state in which the forward movement of the support portion 4A is restricted, as well shown in FIG. Here, the support portion 4A is always attached in the forward movement direction close to the head by a tension spring 16 provided between the stays 4B and 4B and the headrest base portion 4C which is integrally formed. It is in a state of power. Therefore, the support portion 4A is always held in the initial position posture against the urging of the tension spring 16 before the occurrence of the rear collision.
Then, the headrest moving mechanism 10 releases the movement restriction state of the support portion 4 </ b> A due to the occurrence of a vehicle rear collision, and moves the support portion 4 </ b> A forward by the bias of the tension spring 16. Specifically, the headrest moving mechanism 10 moves the support portion 4A forward and upward along the shape of the long holes 11H and 11H formed in the headrest base portion 4C, which will be described later, as shown in FIG. 4A is moved close to the back of the back of the head. Here, the headrest moving mechanism 10 is pushed back to the rear side even if it receives a load due to the rearward tilt of the head when a rear collision occurs in the state of the collision corresponding position in which the support portion 4A is moved close to the back of the rear head. It is supposed not to be. As a result, the seated person's head can be stably received by the support portion 4A held at the position corresponding to the collision.

Returning to FIG. 1, the operation of releasing the movement restriction state of the support portion 4 </ b> A is performed by the push rod 50 inserted into the pipe of the stay 4 </ b> B on one side of the headrest 4.
As shown in FIG. 2, the push rod 50 has an upper end connected to an engaging / disengaging member 15 provided as an operation operation member of the headrest moving mechanism 10. The push rod 50 is connected at its lower end to the upper end of the operation cable 40 routed inside the seat back 2. Here, as shown in FIG. 3, the lower end portion of the operation cable 40 is connected to the detection device 20 at the time of rearward collision of the vehicle disposed in the seat back 2, and downward when the rearward collision of the vehicle occurs. It is designed to be pulled. When the lower end portion of the operation cable 40 is pulled, the operation force is transmitted to the upper end portion as shown in FIG. 2 and converted into a force that pushes the push rod 50 upward. It has a configuration that can.
As a result, the push rod 50 is pushed upward in the drawing, and the engagement / disengagement member 15 is pushed in a direction to release the movement restriction state of the support portion 4A.

Here, the configuration of the detection device 20 at the time of a rear-end collision for pushing the push rod 50 at the time of the rear-end collision of the vehicle will be described.
That is, as shown in FIG. 1, the detection device 20 at the time of rearward collision of the vehicle is disposed at the position of the lower abdomen in the seat back 2. This vehicle rear-end collision detection device 20 is configured to detect the occurrence of a rear-end vehicle collision as the amount of mechanical operation moved by being pushed by a seated person's backrest load when the rear-end collision occurs. It has become. And the lower end part of the operation cable 40 is connected to the detection device 20 at the time of the rear collision of the vehicle so that the lower end part of the operation cable 40 is pulled by the pushed mechanical operation movement amount. It has become.
Here, a foamed wire 2C extending over the entire area in the height direction is disposed inside the gate shape of the back frame 2F. Here, the formed wire 2 </ b> C corresponds to the receiving member of the present invention. The formed wire 2C is provided as a support member for elastically receiving a seated person's backrest load, and is connected by bending a flexible linear wire member in some places. It is formed in U shape.
Specifically, the formed wire 2C has an upper reinforcing plate 2U in which upper ends of two vertically long portions Cv and Cv extending in the vertical direction are respectively spanned between the side frames Fs and Fs of the back frame 2F. On the other hand, it is attached via clips Cr and Cr. Thereby, the formed wire 2C is connected to the back frame 2F so as to be movable in the vertical direction. In the formed wire 2 </ b> C, the laterally elongated portion Ch on the lower edge side extending in the lateral direction is connected to a pressure receiving member 21 that is a constituent member of the detection device 20 at the time of rearward collision of the vehicle, as shown in FIG. 3. . Accordingly, returning to FIG. 1, the foamed wire 2 </ b> C is held in a posture state in which the foamed wire 2 </ b> C is in contact with a cushion pad (not shown) disposed on the backrest side surface in the seat back 2 from the rear side in the free state. Has been. And the formed wire 2C is pressed to the rear side of the seat back 2 by receiving the backrest load of the seated person, and pushes the pressure receiving member 21 connected to the lower end thereof to the rear side. Thereby, the formed wire 2 </ b> C gives the mechanical operation movement amount due to the pushing to the pressure receiving member 21. Here, a spring member (compression spring 26: see FIG. 4) that can elastically receive the movement of the pressure receiving member 21 being pushed rearward is disposed in the detection device 20 at the time of rearward collision of the vehicle. Yes. Thereby, the lower edge side portion (laterally long portion Ch) pressed to the rear side is elastically supported by the detection device 20 at the time of rearward collision of the vehicle. Therefore, the seated person's backrest load is elastically supported by the formed wire 2C in which the lower edge portion is elastically supported. Note that the formed wire 2C is unloaded from the seated person's backrest load, so that the elastic restoring force of the seated wire 2C, the spring restoring force of the compression spring 26 of the detection device 20 at the time of rearward collision of the vehicle, etc. The posture is returned to the initial position before being pushed.

Next, a specific configuration of the detection device 20 at the time of rearward collision of the vehicle connected to the formed wire 2C will be described.
That is, as shown in FIG. 4, the detection device 20 at the time of rearward collision of the vehicle includes a pressure receiving member 21, link wires 22 </ b> A to 22 </ b> C, a first slide member 23, a second slide member 24, and a slide rail 25. And a compression spring 26 and a lid member 27. Here, the first slide member 23 corresponds to the inner slide member of the present invention, the second slide member 24 corresponds to the outer slide member of the present invention, and the compression spring 26 corresponds to the spring member of the present invention. The pressure receiving member 21, the first slide member 23, the second slide member 24, the slide rail 25, and the lid member 27 are formed of resin parts.
Here, FIG. 3 shows an assembled state of the detection device 20 at the time of a rear collision of the vehicle. As shown in the figure, the pressure receiving member 21 is formed in a horizontally long shape, and is integrally connected to the horizontally long portion Ch of the formed wire 2C so as to be sandwiched from the front-rear direction.
Each of the link wires 22A to 22C has the same link length, and the two link wires 22A and 22B form a parallel link between the pressure receiving member 21 and the first slide member 23. Are linked together. The remaining link wire 22C links the pressure receiving member 21 and the second slide member 24 to each other. The link wire 22C is disposed so as to be in a posture orientation opened in a “C” -shaped manner with respect to the link wires 22A and 22B.

The first slide member 23 and the second slide member 24 are fitted to a slide rail 25 formed in a horizontally long shape so as to be slidable in the horizontal direction. Here, as shown in FIG. 1, the slide rail 25 is fixed to a lower reinforcing plate 2 </ b> D spanned between both side frames Fs and Fs of the back frame 2 </ b> F. In the lower reinforcing plate 2D, a central portion for fixing the slide rail 25 is recessed rearward in order to suppress the protrusion of the assembled part of the detection device 20 such as the slide rail 25 in the rearward collision of the vehicle. It is formed into a shape.
Returning to FIG. 3, the end portion of the inner member 41 of the operation cable 40 is connected to the first slide member 23. Specifically, as shown in FIG. 5, the inner member 41 is connected to the first slide member 23 via the compression spring 26. The compression spring 26 is wound around the inner member 41. The compression spring 26 has both end portions between a pedestal-shaped terminal surface portion formed at the end portion of the inner member 41 and a locking surface portion of the first slide member 23 having a surface facing the terminal surface portion. It is provided in the form that is sandwiched between. As shown in FIG. 3, the connecting structure of the inner member 41 is covered with a lid member 27 attached to the first slide member 23 from the outside so that it cannot be seen from the outside. . On the other hand, the end of the outer member 42 of the operation cable 40 is integrally connected to the second slide member 24.

Therefore, as shown in FIG. 6, the first slide member 23 and the second slide member 24 having the above-described configuration are configured such that the pressure receiving member 21 is pushed backward (downward in the drawing) by the horizontally long portion Ch of the formed wire 2C. In accordance with the movement, the slide movement linearly in the direction away from each other. At this time, since the pressure receiving member 21 is linked to the first slide member 23 via the parallel link by the link wires 22A and 22B, the posture state that is always parallel to the first slide member 23 is maintained. It is pushed. Therefore, the formed wire 2 </ b> C connected to the pressure receiving member 21 is also pushed rearward while maintaining the same posture direction. As a result, the posture orientation of the formed wire 2C does not fluctuate, so that the backrest load of the seated person is stably received from the beginning to the end by the formed wire 2C, and the first slide member 23 linked to the pressure receiving member 21 and the link The second slide member 24 is stably pushed from beginning to end and is slid.
Then, as shown in the figure, when this formed wire 2C is pushed by receiving a seated person's backrest load at the normal time, the amount of mechanical operation movement accompanying this pushing is as follows. Absorbed with elastic compression deformation. Therefore, even if the seated person's backrest load is applied to the formed wire 2C at a normal time, the lower end portion of the operation cable 40 is not pulled.
However, as shown in FIG. 7, when the formed wire 2C is pushed by receiving a large backrest load with the occupant's bounce during the rear-end collision of the vehicle, the mechanical operation movement amount associated with the pushing Thus, the end of the inner member 41 is pulled by the sliding movement of the first slide member 23 as the compression spring 26 is fully bent. On the other hand, the end of the outer member 42 is also pulled in the direction opposite to the end of the inner member 41 as the second slide member 24 slides. Therefore, the end portion of the inner member 41 is efficiently pulled out from the end portion of the outer member 42 in accordance with the sliding movement in the opposite directions. Then, when the lower end portion of the inner member 41 is pulled as described above, the operating force is transmitted to the upper end portion of the inner member 41 as shown in FIG. Acts as a force to push 50 up.
Note that the slide positions of the first slide member 23 and the second slide member 24 are such that the elastic restoring force of the formed wire 2 </ b> C, the restoring force of the operation cable 40, and the compression spring when the seated person's backrest load is unloaded. By the action of the spring restoring force 26 and the like, the state is returned to the initial position before sliding (the state shown in FIG. 5).

Next, a transmission structure in which an operation force is transmitted from the operation cable 40 to the push rod 50 will be described.
Here, the operation cable 40 has a double structure in which a linear inner member 41 that is more flexible than the outer member 42 is inserted into a tubular outer member 42 having flexibility. Yes. As shown in FIG. 3, the lower end portions of the inner member 41 and the outer member of the operation cable 40 are connected to the above-described detection device 20 at the time of rearward collision of the vehicle. As a result, the operation cable 40 is towed in such a manner that the lower end portion of the inner member 41 is pulled out from the lower end portion of the outer member 42 at the time of rear collision of the vehicle.
As shown in FIG. 8, the operation cable 40 has a push rod inside the stay 4 </ b> B that is inserted into the cylinder of the support 2 </ b> S when its upper end is inserted into the cylinder of the support 2 </ b> S from below. 50 can be assembled in a state where it can be pushed.
Specifically, the operation cable 40 includes T-shaped engagement protrusions 41P and 41P formed at the upper end portion of the inner member 41 through elongated holes 42S and 42S formed through the peripheral wall on the upper end side of the outer member 42, respectively. It has a configuration that protrudes outward in the radial direction. As a result, the inner member 41 can move relative to the outer member 42 in the axial direction within a range in which the engagement protrusions 41P and 41P protruding in a T shape are movable in the long holes 42S and 42S. It is said that. The engaging protrusions 41P and 41P and the long holes 42S and 42S are formed at two locations in the circumferential direction that are axially symmetric with respect to the inner member 41 and the outer member 42. A round planar head 42H is formed at the upper end of the outer member 42 so as to close the tubular end shape.

The operation cable 40 having the above configuration is temporarily held in a state where the upper end portion is suspended from the support 2S as shown in FIG. 9 by inserting the upper end portion into the cylinder of the support 2S from below. It has become so. In this state, by inserting the stay 4B into the cylinder of the support 2S from above, the operation cable 40 is suspended from the state suspended from the support 2S by the stay 4B as shown in FIG. It can be changed to the state. When the operation cable 40 is suspended from the stay 4B as described above, the operation cable 40 transmits the operation force pulled at the lower end side to the push rod 50 inside the stay 4B as a push operation force. It will be in a state that can be.
Specifically, the above-described configuration will be described in detail. First, as shown in FIG. 8, slit-like insertion grooves Sd and Sd extending in the axial direction from the lower end of the support 2S upward are provided on the peripheral wall of the support 2S. It is formed through. The insertion grooves Sd and Sd are formed in two axially symmetrical positions in the circumferential direction, and the engaging protrusions 41P and 41P formed on the inner member 41 of the operation cable 40 are formed in the groove shape. These can be received and moved in the axial direction.
Each of the insertion grooves Sd and Sd has a shape that extends toward the end portion on the upper end side of the insertion grooves Sd and Sd. Specifically, the end portion shape of the insertion groove Sd indicated by a solid line on the front side of the drawing shown in FIG. 8 is a shape curved in the left direction in the drawing. The end portion shape of the insertion groove Sd indicated by a broken line on the back side is a shape that is curved in the right direction in the drawing and is axially symmetric with respect to the insertion groove Sd on the front side. And the terminal part shape of each insertion groove | channel Sd and Sd curved in these circumferential directions is formed in the shape hung down below horizontal. Accordingly, the operation cable 40 inserted to the end portions of the insertion grooves Sd and Sd is stably held as being suspended from the support 2S so that the operation cable 40 does not fall downward due to its own weight. It is like that.
The operation cable 40 is moved upward along the shape of the insertion grooves Sd and Sd with the engagement protrusions 41P and 41P formed on the upper end of the inner member 41 being inserted into the insertion grooves Sd and Sd. By being inserted through, the support 2S is inserted into the cylinder. As shown in FIG. 9, each of the engagement protrusions Sd and Sd is operated by turning the operation cable 40 in the circumferential direction along the curved shape of the end portion when it reaches the end portion of the insertion groove Sd. 41P and 41P reach the end portions of the insertion grooves Sd and Sd, and the operation cable 40 is suspended from the support 2S.
Here, returning to FIG. 8, the upper end portion of the outer member 42 is formed of synthetic resin, and partially bulges outward in the radial direction at an intermediate position in the axial direction that is inserted into the cylinder of the support 2 </ b> S. An elliptical bulge portion 42D is formed. The bulging portion 42D is formed in a serrated and uneven shape on the entire circumference, and has an outer diameter dimension substantially the same as an inner diameter dimension of the support 2S. As a result, when the operation cable 40 is inserted into the cylinder of the support 2S, the bulging portion 42D is gently fitted into the cylinder shape of the support 2S, so that the operation cable 40 is fluttered in the cylinder. It can be inserted smoothly.

As shown in FIG. 9, slit-like receiving grooves Bd and Bd extending in the axial direction upward from the lower end of the stay 4 </ b> B inserted through the support 2 </ b> S are formed so as to penetrate therethrough. . These receiving grooves Bd, Bd are formed in an axially symmetrical shape at two locations in the circumferential direction that are axially symmetric. These receiving grooves Bd and Bd insert the stay 4B into the cylinder of the support 2S from the upper side, thereby allowing the engagement protrusions 41P and 41P of the inner member 41 of the operation cable 40 suspended from the support 2S to be received. Accept inside each groove shape. Then, by further inserting the stay 4B from this state, the engaging protrusions 41P and 41P are inserted upward along the shapes of the receiving grooves Bd and Bd.
Here, the receiving grooves Bd and Bd are shaped so that their end portions are curved in the circumferential direction on the side opposite to the aforementioned insertion grooves Sd and Sd. These receiving grooves Bd and Bd are formed in a shape that is gently curved from the axial direction toward the horizontal direction toward the terminal portion thereof, and due to the axial force that inserts the stay 4B into the cylinder of the support 2S. The engaging protrusions 41P and 41P of the inner member 41 can be received up to the position of the terminal portion facing in the horizontal direction.
Therefore, as shown in FIG. 10, the engagement protrusions 41P and 41P of the inner member 41 are curved in the receiving grooves Bd and Bd by performing an operation of inserting the stay 4B into the cylinder of the support 2S. Rotate in the circumferential direction as guided by. As a result, the engagement protrusions 41P and 41P are pulled back so as to escape from the end portions of the insertion grooves Sd and Sd, and at the same time as reaching the end portions of the receiving grooves Bd and Bd, the insertion grooves Sd. , Sd reaches a groove-shaped portion extending linearly in the axial direction.
Thereby, each engagement protrusion 41P and 41P is changed from the state suspended from the support 2S to the state suspended from the stay 4B. In this state, the engagement protrusions 41P and 41P are allowed to move relative to the support 2S in the axial direction, but are restricted from moving relative to the stay 4B in the axial direction. Accordingly, when the stay 4B is further inserted into the support 2S from this state, the engagement protrusions 41P and 41P move integrally with the stay 4B and below the support 2S.

Here, as shown in FIG. 11, the stay 4 </ b> B is provided with a concave locking groove Bk that is notched in the outer peripheral wall thereof and is urged into the insertion port Sa of the support 2 </ b> S. By locking with the pawl Sb, the movement in the insertion direction is restricted. Thereby, the stay 4B is held in the inserted state, and the headrest 4 is attached to the upper surface portion of the seat back 2. The movement restricting state of the stay 4B by the locking claw Sb can be released by pushing the knob Sb provided on the side portion on the upper end side of the support 2S.
In this state, as shown in FIG. 11, the lower end of the push rod 50 inserted into the stay 4B and the head of the outer member 42 of the operation cable 40 inserted from below into the stay 4B. The part 42H is in an arrangement state close to each other.
Therefore, in this state, when the inner member 41 of the operation cable 40 is pulled from below, the push rod 50 is pushed up by the head 42H of the outer member 42 from below as shown in FIG. It is pushed upward in the form. That is, the operation cable 40 is in a state in which the upper end portions (engagement protrusions 41P, 41P) of the inner member 41 are engaged with the stay 4B and integrally connected in the axial direction. On the other hand, the upper end portion (head 42 </ b> H) of the outer member 42 is in a state in which it can move relative to the inner member 41 in the axial direction. Accordingly, when the lower end side of the inner member 41 is pulled in this state, the upper end portion of the outer member 42 is pushed upward relatively from the upper end portion of the inner member 41 in accordance with the operation movement amount that has been pulled. Become a form. As a result, as shown in FIG. 2, the operating force obtained by pulling the operation cable 40 during a rear-end collision of the vehicle can be transmitted to the push rod 50 inside the stay 4B as a pressing operation force. The engagement / disengagement member 15 provided as the operation operation member can be rotated.

Next, the headrest moving mechanism 10 will be described. The configuration of the headrest moving mechanism 10 is shown in FIGS. 12 to 18, but the state of FIG. 15 best represents the configuration of each unit, so the configuration of each unit will be described with reference to this figure.
The headrest moving mechanism 10 is provided in relation to the headrest base 4C and the support 4A, and includes a pair of connecting links 12 and 12, support members 13 and 13 and hooks 14 and 14 provided in the width direction. And an engaging / disengaging member 15, a tension spring 16, and lever members 17, 17.
Here, the headrest base portion 4C is formed of a synthetic resin, and has a configuration in which a plate-like rear surface portion 11B, a bottom surface portion 11D, both side surface portions 11S and 11S, and an upper surface portion 11U are integrally formed. Specifically, the bottom surface portion 11D is formed to extend forward from the lower end edge of the rear surface portion 11B. The side portions 11S and 11S are formed so as to stand on both sides in the width direction of the headrest base portion 4C. And the upper surface part 11U is formed in the form which connects the upper edges of both side surface parts 11S and 11S.
Here, FIG. 18 shows a view seen from the direction of the XVIII line of FIG. 15, that is, a view of the headrest 4 seen from diagonally below on the front side. As shown in the figure, a plurality of plate-like ribs 11R (... indicates a plurality) are erected between the side surface portions 11S, 11S of the headrest base 4C in parallel therewith. The headrest base 4C is reinforced.
The headrest base portion 4C is fixed integrally with the bottom portion 11D of the headrest base portion 4D by inserting the upper end portions of the stays 4B and 4B, respectively. These stays 4B and 4B are formed in a tubular shape, and are attached in such a manner that an opening portion on the upper end side is exposed on the upper surface side of the bottom surface portion 11D.
Moreover, the long holes 11H penetrated in the plate | board thickness direction at the both-sides surface part 11S and 11S of 4 C of headrest bases are each formed. The long holes 11H and 11H are formed between the lower end portions H0 and H0 and the upper end portions H3 and H3. The first stopper grooves H1 and the second stopper grooves H1 are stepped in a undulating manner on the rear side (right side in the drawing). A stopper groove H2 is formed in each.

Next, the pair of connecting links 12 and 12 are made of synthetic resin, and are configured as a connecting member that links and connects the headrest base portion 4C and the support portion 4A. These connecting links 12 and 12 are arranged side by side in the width direction, and the front and rear end portions thereof are linked to a portion near the upper end of the headrest base portion 4C and a portion on the rear surface side of the support portion 4A.
Specifically, the connecting links 12 and 12 are pivotally supported by connecting shafts 12A provided with end portions on the rear side penetrating through both side surface portions 11S and 11S of the headrest base portion 4C. More specifically, as shown in FIG. 18, the rear end portions of the connecting links 12 and 12 are disposed between the side surface portions 11S and 11S and the ribs 11R and 11R inside them. These are pivotally supported by the connecting shaft 12A spanned between them.
Returning to FIG. 15, the front end portions of the connecting links 12, 12 are pivotally supported by a connecting shaft 12 </ b> B spanned in the width direction on the rear surface portion of the support portion 4 </ b> A. . These connecting shafts 12A and 12B are arranged in parallel to each other.
The connecting links 12 and 12 contact the upper surface portion 11U of the headrest base portion 4C by rotating clockwise from the state shown in FIG. 12 about the connecting shaft 12A on the rear end side in the clockwise direction. The rotation of is controlled.

Next, the pair of support members 13 and 13 are integrally formed with the support portion 4A so as to extend from the rear surface side of the support portion 4A to the rear side thereof. These support members 13 and 13 are arranged side by side in the width direction of the support portion 4A. Here, the support portion 4A is formed in a curved plate shape that is curved as a whole by integral molding of synthetic resin, and a support portion for supporting the support members 13, 13 and the connecting shaft 12B described above on the rear surface side. Are formed integrally.
These support members 13, 13 are connected so that their rear end portions are integrated with each other by a connecting shaft 13A extending in the width direction. Specifically, as shown in FIG. 18, the rear end portions of the support members 13 and 13 are located between the ribs 11R and 11R arranged on both outer sides and the ribs 11R and 11R on the inner side thereof. They are sandwiched and are connected to each other by a connecting shaft 13A. Here, the connecting shaft 13A that connects the end portions on the rear side of the support members 13 and 13 is disposed in parallel to the connecting shaft 12A and the connecting shaft 12B described above. The connecting shaft 13A is in a state where each end portion thereof is inserted into each of the long holes 11H and 11H formed in the side surface portions 11S and 11S of the headrest base portion 4C. As a result, the connecting shaft 13A can be moved in the front-rear direction and the up-down direction only within the range of the shape of the long holes 11H, 11H. Each rib 11R (see FIG. 18) formed between the side surface portions 11S, 11S is formed in a shape that does not interfere with the connecting shaft 13A moving in the long holes 11H, 11H.

Next, as shown in FIG. 13, the pair of hooks 14, 14 are made of metal parts, and the long holes 11 </ b> H, 11 </ b> H of the connecting shaft 13 </ b> A connecting the pair of support members 13, 13 described above. It is comprised as a control member which controls a movement. The hooks 14 and 14 are formed in a cam shape as a whole, and are arranged side by side in the width direction at a position near the lower end of the headrest base 4C.
Specifically, as shown in FIG. 18, the hooks 14 and 14 are disposed between the side surface portions 11S and 11S and the ribs 11R and 11R inside thereof, and are spanned between them. Each of the connecting shafts 14A and 14A is rotatably supported.
Returning to FIG. 13, the upper jaw part 14 </ b> B and the lower jaw part 14 </ b> C having a shape protruding outward in the radial direction are formed at two places in the circumferential direction on the outer peripheral edge portions of the hooks 14, 14, respectively. Has been. Thereby, the dent is formed between each upper jaw part 14B and 14B and lower jaw part 14C and 14C. In the recess between the upper jaw portion 14B and the lower jaw portion 14C, a connecting shaft 13A that connects the pair of support members 13 and 13 can be housed inside as described later. Here, the connecting shafts 14A and 14A are arranged in parallel to the connecting shafts 12A and 12B and the connecting shaft 13A described above.
And torsion springs 14S and 14S are respectively hooked between the hooks 14 and 14 and the headrest base 4C. These torsion springs 14S and 14S are in a pre-twisted state as shown in FIG. 13, and each hook 14 and 14 is urged to rotate counterclockwise as shown in FIG. ing.
And the locking groove 14D of the shape depressed in the step shape is formed in the outer peripheral edge part of these hooks 14 and 14, respectively. A pair of engagement arm portions 15C and 15C constituting an engagement / disengagement member 15 described later are engaged with the engagement grooves 14D and 14D, respectively. Thereby, the hooks 14 and 14 are in a state in which the counterclockwise rotation due to the biasing is restricted.

In the state where the counterclockwise rotation of the hooks 14 and 14 is restricted, the connecting shaft 13A is housed in a recess between the upper jaw portions 14B and 14B and the lower jaw portions 14C and 14C. As a state, the connecting shaft 13A is held in a state of being engaged with the lower end portions H0 and H0 of the long holes 11H and 11H. Here, as shown in FIG. 12, the connecting shaft 13A is urged in a direction attracted to the connecting shaft 12A by a tension spring 16 hooked between the connecting shaft 12A and the elongated holes 11H, It is in a state of being urged toward the upper end portions H3 and H3 along the shape of 11H. Therefore, the connecting shaft 13A is held in a state (initial position state) locked to the lower end portions H0 and H0 of the long holes 11H and 11H by the hooks 14 and 14 against the urging force of the tension spring 16. Has been.
Returning to FIG. 13, the hooks 14, 14 are engaged with the torsion springs 14 </ b> S, 15 </ b> C, when the engagement arm portions 15 </ b> C, 15 </ b> C are operated to rotate counterclockwise in the drawing to release the engagement state therebetween. It is rotated counterclockwise by the urging force of 14S. Thereby, as shown by the phantom line state of FIG. 13, the hooks 14 and 14 move the respective upper jaw portions 14B and 14B out of the long holes 11H and 11H, and push up the lower jaw portions 14C and 14C from the lower side. The posture is exposed in the holes 11H and 11H. Thereby, the locking state of the connecting shaft 13A by the hooks 14 and 14 is released, and the connecting shaft 13A follows the shape of the long holes 11H and 11H by the urging force of the tension spring 16 as shown in FIGS. To move forward and upward. As a result, the support portion 4 </ b> A moves forward and upward relative to the headrest base portion 4 </ b> C while the connection links 12 and 12 are rotated.

Returning to FIG. 13, the engaging arm portions 15 </ b> C and 15 </ b> C for restricting the counterclockwise rotation of the hooks 14 and 14 are arranged in the width direction so as to be engageable with the hooks 14 and 14. Has been. Specifically, as shown in FIG. 18, the engaging arm portions 15C and 15C are arranged so as to be sandwiched between both side surface portions 11S and 11S that are the same as the hooks 14 and 14 and the ribs 11R and 11R inside them. It is pivotally supported by a connecting shaft 15B provided so as to penetrate both side surface portions 11S and 11S. The connecting shaft 15B is integrally connected to the engaging arm portions 15C and 15C, and is pivotally supported with respect to the side surface portions 11S and 11S. The connecting shaft 15B is disposed in parallel with the connecting shafts 12A and 12B and the connecting shaft 13A.
A torsion spring 15S is hooked between the one engaging arm portion 15C and the headrest base portion 4C. As shown in FIG. 13, the torsion spring 15S is in a pre-twisted state, and urges each of the engaging arm portions 15C and 15C to rotate clockwise from the position shown in FIG. ing. As a result, the engaging arm portions 15C and 15C are normally pressed against the outer peripheral surface portions of the hooks 14 and 14, and the tip side portions thereof are stepped locking grooves 14D and 14D. Each is held in an engaged posture. In a state where these engaging arm portions 15C and 15C are inserted into the locking grooves 14D and 14D, the engaging arm portions 15C and 15C that are urged to rotate in the clockwise direction shown in the figure and the counterclockwise direction that is shown in the figure are rotated The hooks 14 and 14 that are being urged are in abutment with each other, and their urging rotations are regulated by each other.

Then, returning to FIG. 12 again, the right end portion of the connecting shaft 15B integrally connected to both the engaging arm portions 15C and 15C, that is, the end portion on the side shown in FIG. The operating arm portion 15A that is rotated by receiving the power transmission from the push rod 50 described above is integrally connected. The operating arm portion 15A is rotated counterclockwise by the push rod 50 being pushed upward when a vehicle rearward collision occurs, and the engaging arm portions 15C and 15C described above with reference to FIG. Are rotated in the same direction. Thereby, each engagement arm part 15C, 15C is removed from the engagement state with the hooks 14, 14, and the support part 4A is quickly moved forward by the urging force of the tension spring 16 from the initial position.
As shown in FIG. 15, the support portion 4A reaches the upper end portions H3 and H3 of the long holes 11H and 11H, so that the forward movement thereof is restricted and restrained. . In this state, the support portion 4A is not pushed back to the rear side even if it receives a load that catches the head of the seated person.
That is, when the connecting shaft 13A reaches the upper end portions H3 and H3 of the long holes 11H and 11H, the connecting links 12 and 12 connecting the support portion 4A come into contact with the upper surface portion 11U of the headrest base portion 4C, The rotation in the clockwise direction shown in the figure is restricted. In this state, the connecting links 12 and 12 are only pressed against the upper surface portion 11U of the headrest base portion 4C and pushed back in the counterclockwise direction shown in the figure even if the force that pushes and moves the support portion 4A backward is applied. There is no such thing. Therefore, the seated person's head can be stably received by the support portion 4A at this collision-corresponding position.
Further, as shown in FIG. 14, the support portion 4 </ b> A is not pushed back to the rear side even when it receives a load from the head of the seated person even in the middle of its forward movement. That is, when the support shaft 4A is moved forward, the connecting shaft 13A that moves forward and upward in the long holes 11H and 11H is moved to the rear side when a force that pushes back in the middle of the movement acts. The first stopper grooves H1 and H1 and the second stopper grooves H2 and H2 that are formed to be recessed in steps (right side in the figure) enter the inside. Note that FIG. 14 illustrates a state in which the connecting shaft 13A enters the second stopper grooves H2 and H2. Thereby, the movement by which the connecting shaft 13A is pushed back can be restricted, and the support portion 4A can be prevented from being pushed back to the rear side. Therefore, the head of the seated person can be stably received by the support portion 4A even at a midway position before reaching the collision corresponding position.

Here, returning to FIG. 12, a pair of lever members 17 and 17 formed of a horizontally long plate-like member are disposed on the headrest base 4C. These lever members 17, 17 are arranged side by side in the width direction, and their rear end portions are pivotally supported by the headrest base portion 4C so as to be rotatable.
Specifically, as shown in FIG. 18, the lever members 17, 17 are formed between the ribs 11 </ b> R, 11 </ b> R whose end portions on the rear side are arranged on both outer sides and the ribs 11 </ b> R, 11 </ b> R inside them. And are rotatably supported by connecting shafts 17A and 17A spanned between them.
And the torsion springs 17S and 17S are respectively hooked between these lever members 17 and 17 and the headrest base 4C. As shown in FIG. 12, these torsion springs 17S and 17S are wound around the connecting shafts 17A and 17A. One end of each of the torsion springs 17S and 17S is hooked on the lever members 17 and 17, and the other end is the headrest base. It is attached to 4C respectively. Thereby, the lever members 17 and 17 are hold | maintained in the attitude | position state exposed in the hole of the long holes 11H and 11H with the spring force of each torsion spring 17S and 17S in the free state.
A spoon-shaped receiving portion 17B is formed at the tip end side (the left end side in the drawing) exposed in the long holes 11H and 11H of the lever members 17 and 17, respectively. As shown in FIG. 14, the spoon-shaped receiving portions 17B and 17B are provided in the case where the connecting shaft 13A moves in the long holes 11H and 11H upward from the lower end portions H0 and H0. The long holes 11H and 11H are pushed out of the holes by being pushed away. However, as shown in FIG. 15, the receiving portions 17B and 17B are long again by the spring action of the torsion springs 17S and 17S when the connecting shaft 13A reaches the upper end portions H3 and H3 of the long holes 11H and 11H. The postures exposed in the holes 11H and 11H are returned.
Then, as shown in FIG. 16, the receiving portions 17B and 17B have a connecting shaft 13A that is moved downwardly from the upper end portions H3 and H3 through the long holes 11H and 11H. Accept and catch. Then, when the connecting shaft 13A is further moved downward from this state, the lever members 17 and 17 are counterclockwise as shown in the figure while maintaining the state in which the connecting shaft 13A is caught by the receiving portions 17B and 17B. Pushed around. As a result, the connecting shaft 13A moves downward while being guided by the lever members 17 and 17, and is moved to the vicinity of the lower end portions H0 and H0 as shown in FIG. 17, thereby receiving portions 17B and 17B. Removed from. Thus, when the connecting shaft 13A is transferred downward from the upper end portions H3 and H3 in the long holes 11H and 11H, the first stopper grooves H1 and H1 and the second stopper grooves are moved by the lever members 17 and 17, respectively. It is smoothly transferred to the lower end portions H0 and H0 without entering H2 and H2.

The connecting shaft 13A is operated so as to push it into the lower end portions H0 and H0 of the long holes 11H and 11H, whereby the lower jaw portions 14C of the hooks 14 and 14 exposed at the lower end portions H0 and H0. The lower end H0, H0 is reached while pressing 14C. As a result, as shown in FIG. 13, the hooks 14 and 14 are pushed in the clockwise direction in the drawing, and the upper jaw portions 14B and 14B are turned to the upper side of the connecting shaft 13A.
The hooks 14 and 14 are rotated in the clockwise direction shown in the figure, whereby the engagement portions Ct and Ct of the engagement arm portions 15C and 15C are elastically inserted into the locking grooves 14D and 14D. In order to enter, it is again locked by the engaging arm portions 15C and 15C. As a result, the hooks 14 and 14 are locked again with the connecting shaft 13A held at the initial position. As a result, the support portion 4A is held in a state where the posture is returned to the initial state before moving forward.

Next, the usage method of a present Example is demonstrated.
That is, referring to FIG. 1, the vehicle seat 1 is always in a state in which the support portion 4 </ b> A of the headrest 4 is held in the initial position posture state before the vehicle rear-end collision occurs. When the rearward collision of the vehicle occurs, the pressure receiving member 21 is pushed rearward under the backrest load of the seated person who is pressed against the seat back 2, and the engagement / disengagement member is interposed via the operation cable 40 and the push rod 50. 15 is rotated. Thereby, the holding state in the initial position of the support part 4A is released. As a result, the support portion 4A is moved from the initial position shown in FIG. 15 to the collision corresponding position shown in FIG. 15 by the urging force of the tension spring 16 shown in FIG. And 4 A of support parts receive the seated person's head leaning back by the momentum at the time of a rear collision at this collision corresponding position from back side.

As described above, according to the configuration of the present embodiment, the formed wire 2C (receiving member) that receives the backrest load of the seated person is not the pressure receiving member 21 but the back frame 2F that is the skeleton frame of the seat back 2. Further, since the power transmission path via the operation cable 40 is elastically supported, the backrest load applied to the formed wire 2C can be used as it is as a pressing force for pushing the pressure receiving member 21. Accordingly, the backrest load of the seated person can be easily applied to the pressure receiving member 21 in the seat back 2 provided as a trigger for operating the headrest 4 when the rear collision of the vehicle occurs. Cable operation can be performed.
Furthermore, the compression spring 26 (spring member) is provided at the connecting portion between the operation cable 40 that can be moved only in the axial direction and the pressure receiving member 21, so that the formed wire 2C, the pressure receiving member 21, and the operation cable 40 are connected. The compression spring 26 can be set without destabilizing the operation.
Further, the backrest of the seated person is supported by the formed wire 2C by the configuration in which the pressure receiving member 21 and the first slide member 23 connected to the formed wire 2C are linked through parallel links using the link wires 22A and 22B. The load can be received in the same orientation from end to end, and the first slide member 23 can be stably slid from end to end by the pressure receiving member 21, so that the operation cable 40 can be operated stably. it can.
Furthermore, by adopting a configuration in which the end portions on the operated side of the inner member 41 and the outer member 42 of the double structure operation cable 40 are operated in directions away from each other when the pressure receiving member 21 is pushed, The operation of pulling the operation cable 40 can be efficiently performed with respect to the mechanical operation movement amount by which the pressure receiving member 21 is pushed.

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 operation cable has a double structure, and the pull type cable structure in which the lower end portion of the inner member is operated by being pulled out from the lower end portion of the outer member is illustrated. A cable structure can also be applied. In this case, the first slide member and the second slide member are configured to slide in a direction approaching each other by the movement of the pressure receiving member being pushed.
Further, although the compression spring is exemplified as the spring member for elastically supporting the formed wire corresponding to the receiving member, other spring members such as a tension spring can be applied. Moreover, although the example in which this spring member is interposed between the inner member and the first slide member is shown, the spring member may be interposed between the outer member and the second slide member.
Moreover, in order to stabilize the movement of the pressure receiving member, the configuration in which the pressure receiving member and the first slide member are linked and connected by a parallel link is illustrated. However, the pressure receiving member and the second slide member are linked and connected by a parallel link. There may be. Further, instead of the parallel link, it may be a configuration in which these are simply linked to each other. However, there is a case where the operation of the operation cable is not stably performed because the pushed movement of the pressure receiving member is deflected. Care must be taken.

1 is a perspective view schematically showing an overall configuration of Example 1. FIG. It is a state figure showing the state where the push rod was pushed upward by the operation cable. It is an expansion perspective view showing the mechanism which operates an operation cable at the time of vehicle rear collision. It is a disassembled perspective view of the detection apparatus at the time of vehicle rear collision. It is a top view showing the initial state of the detection apparatus at the time of vehicle rear collision. FIG. 6 is a plan view showing a state in which the compression spring is fully bent from the state of FIG. 5. It is a top view showing the state by which the operation cable was operated from the state of FIG. It is the perspective view which expanded and represented the insertion structure in which the stay and operation cable of a headrest are penetrated inside a support. It is a perspective view showing the state before inserting a stay into the inside of a support. It is a perspective view showing the state by which the stay was penetrated inside the support. It is the XI-XI sectional view taken on the line of FIG. It is a side view showing the state where the support part of the headrest is held in the initial position. It is the schematic diagram which looked at the internal structure of the headrest moving mechanism in FIG. 12 from the XIII-XIII line cross section of FIG. It is a side view showing the state in the middle of the support part of a headrest moving toward the head from the state of FIG. It is a side view showing the state where the support part of the headrest has finished approaching toward the head. FIG. 16 is a side view illustrating a state in the middle of returning the support portion of the headrest toward the initial position from the state of FIG. 15. It is the side view showing the state in the middle of returning the support part of a headrest further toward the initial position from the state of FIG. It is the block diagram which looked at the headrest moving mechanism from the XVIII line direction of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle 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 2U Upper reinforcement plate 2D Lower reinforcement plate 2C Formed wire (receiving member)
Cv Longitudinal part Ch Horizontal part Cr clip 4 Headrest 4A Supporting part 4B Stay Bk Locking groove Bd Receiving groove 4C Headrest base part 10 Headrest moving mechanism 11B Rear surface part 11D Bottom part 11S Side part 11U Upper surface part 11R Rib 11H Long hole H0 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 Engaging / disengaging member 15A Operation arm portion 15B Connection shaft 15C Engagement arm portion 15S Torsion spring 16 Tension spring 17 Lever member 17A Connection shaft 17B Reception portion 17S Torsion spring 20 Detection device 21 at the time of rearward collision of the vehicle 21 Pressure receiving member 22A to 22C Link wire 23 First slide member Inner side slide member)
23A Locking surface portion 24 Second slide member (outer side slide member)
25 Slide rail 26 Compression spring (spring member)
27 Lid member 40 Operation cable 41 Inner member 41P Engagement protrusion 41T Terminal surface part 42 Outer member 42S Long hole 42H Head part 42D Bulging part 42G Guide part 50 Push rod

Claims (4)

A vehicle seat capable of moving a support portion of a headrest that receives a head of a seated person when a rearward collision of the vehicle is detected to be close to the head by moving relative to the seat back,
In the seat back, the occurrence of the rear impact of the vehicle can be detected as the amount of mechanical operation moved by being pushed by the backrest load of the seated person who presses against the seat back when the rear impact of the vehicle occurs. A vehicle rear-end collision detection device provided in
By receiving a mechanical operation movement amount at the time of rear-end collision of the vehicle via a mechanical transmission mechanism by an operation cable connected to the detection device, the headrest support portion is relatively close to the head. A headrest moving mechanism that can be moved,
The vehicle rear-end collision detection device operates an operation cable by a movement in which a pressure receiving member disposed in a seat back is pushed by a seated person's backrest load. And a receiving member for elastically receiving a normal backrest load of a seated person in the seat back is connected to the pressure receiving member. In addition, the power receiving path through which the receiving member receives the receiving force when the receiving member receives the backrest load of the seated person and the power transmission path via the operation cable is provided in a normal state. A spring member that is elastically deformed by receiving the backrest load of the seated person is provided, and the receiving member elastically receives the backrest load of the seated person at normal time by the spring force of the spring member. For Vehicle seat catch force is characterized in that it is configured to be secured. The vehicle seat according to claim 1,
The vehicle seat according to claim 1, wherein the spring member is provided in a connecting portion between the pressure receiving member and the operation cable. The vehicle seat according to claim 1 or 2,
The connection structure of the operation cable has a configuration in which an end portion on the side where the operation cable is operated is connected to a slide member that is slidably movable in a plane direction perpendicular to the pressing direction of the pressure receiving member. And
The slide member and the pressure receiving member are linked to each other via a parallel link, and the pressure receiving member is pushed by a seated person's backrest load while maintaining a parallel posture with respect to the slide member. A vehicle seat characterized by being made. The vehicle seat according to any one of claims 1 to 3,
The operation cable has a double structure in which an inner member capable of pulling or pushing is inserted in an axial direction inside a tubular outer member,
The inner member and the outer member are respectively connected to an inner side slide member or an outer side slide member whose end on the side to be operated is linked to the pressure receiving member,
When the pressure receiving member is pushed, the inner side sliding member and the outer side sliding member slide and move in a linear direction opposite to each other on a plane perpendicular to the pushing direction of the pressure receiving member. The vehicle seat, wherein the end portions on the operation side of the inner member and the outer member are operated in directions to approach or separate from each other.

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