JP2008184090A - Insertion structure for linear core member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily insert a linear core member of relatively high rigidity into a pipe of a stay of a head rest formed in a bent shape. <P>SOLUTION: In the insertion structure, a push rod 50 (linear core member) formed in a lengthy shape in an axial direction is inserted into the pipe of a hollow pipe-like stay 4B provided integrally with the head rest 4. On the stay 4B, a bent part Bj having a bent central axis is formed on a midway position in a length direction. The push rod 50 is made to a constitution that push operation provided with rigidity that the lower end can transmit the pressing force pushed up in an axial direction to an upper end can be performed in the state that it is inserted into the pipe of the stay 4B. In the push rod 50, the midway positions in the length direction are formed such that the central axis is bent at a plurality of portions in the same direction as the bent part Bj of the stay 4B. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wire core member insertion structure. More specifically, the present invention relates to a wire core member insertion structure for inserting a wire core member formed in an axially long shape into a tube of a hollow tubular stay provided integrally with a headrest of a vehicle seat.

2. Description of the Related Art Conventionally, there is a vehicle seat that employs a mechanism that supports the headrest so that the headrest of the seated person is prevented from being tilted backward by instantaneously moving the headrest forward when a vehicle rear-end collision is predicted or detected. . For example, Patent Document 1 below discloses a technique in which a headrest can be instantaneously moved forward by using a movement of a seated person's back against a seat back as a trigger during a vehicle rear-end collision.
In this disclosure, the headrest is always held in the posture state at the initial position before moving forward by the lock device before the vehicle rear collision occurs. The holding device that holds the headrest in the initial position is provided in the headrest, and is connected to a pressure receiving member provided in the seat back by a cable. The pressure receiving member is pushed by the movement of the seated person's back against the seat back when a vehicle rear-end collision occurs. The pressure receiving member pulls the cable by the pushed movement and releases the holding state of the holding device.
Here, the cable that connects the holding device in the headrest and the pressure receiving member in the seat back is routed through the pipe of the stay of the headrest inserted into the upper surface portion of the seat back. This ensures that the cable is routed nicely through the interior so that it is not visible from the exterior of the seat.
JP 2005-104259 A

  However, in the conventional disclosed technology, when the cable connecting the holding device and the pressure receiving member has a push type configuration that receives the pressing force from the pressure receiving member, the cable is provided with relatively high rigidity. This makes it difficult to insert this through the stay. In other words, the headrest stay is normally in a forward tilted posture in which the middle portion in the longitudinal direction is bent in a “ku” shape so that the headrest is mounted in a posture in which the headrest projects forward with respect to the seat back. It is formed in a bent shape. Therefore, it is difficult to insert a highly rigid cable (wire core member) through such a bent stay.

  The present invention has been devised as a solution to the above-described problems, and the problem to be solved by the present invention is that a relatively high-strength wire core is provided in a stayrest pipe formed in a bent shape. The purpose is to allow the member to be easily inserted.

In order to solve the above problem, the wire core member insertion structure of the present invention takes the following means.
First, a first invention is a wire core member for inserting a wire core member formed in a long shape in an axial direction into a tube of a hollow tubular stay provided integrally with a headrest of a vehicle seat. It is an insertion structure. The hollow tubular stay is formed with a bent portion whose central axis is bent at an intermediate position in the length direction. When the wire core member is inserted into the pipe of the stay, the end on one side is pressed in the axial direction toward the end on the other side, so that the axial pressing force is applied to the end on the other side. The push operation with the rigidity that can be transmitted to the part is possible. The wire core member is formed with a plurality of bent portions whose central axis is bent in the same direction as the bent portion of the stay at an intermediate position in the length direction.
According to the first aspect of the invention, the wire core member having rigidity capable of a push operation has a plurality of bent portions formed in the middle in the length direction, and is bent as compared with a configuration without a bent portion. It is easy to deform. These bent portions are formed by bending in the same direction as the bent portion formed on the stay. Accordingly, in the process of inserting the wire core member into the stay pipe, even if the wire core member is abutted against the inner wall of the stay pipe and resistance is given to the insertion, the wire core member is further inserted. By applying a force in the direction, the wire core member bends and deforms the nodes following the bent pipe shape of the stay. Accordingly, the wire core member is bent and deformed following the shape of the stay in the tube, and is inserted into the tube of the stay with a relatively light force.

Next, according to a second aspect of the present invention, in the first aspect described above, the at least one bent portion formed in the wire core member has an end portion on one side of the wire core member that extends from the opening portion on one side of the stay. When it is inserted to the position where it passes through the bent portion, it is arranged so as to be located in the pipe of this stay.
According to the second aspect of the invention, in a state where the one end portion of the wire core member has passed through the bent portion of the stay and the wire core member is abutted against the inner wall in the stay tube, the wire core member is Take the following posture in the tube. That is, the wire core member takes a posture state in which the central axis is bent in the stay tube, following the shape in the tube, by at least one bent portion located in the tube of the stay. Therefore, when a force is applied in a direction in which the wire core member is further inserted from this state, the wire core member is inserted into the stay tube while being bent and deformed by at least one bent portion located in the stay tube.

Next, according to a third invention, in the first or second invention described above, the curvature of each bent portion formed in the wire core member is gentler than the curvature of the bent portion of the stay.
According to the third aspect of the invention, the wire core member has a plurality of bent portions. Therefore, even if the curvature of each bent portion is made slower than the curvature of the bent portion of the stay, the wire core member is inserted into the stay tube with a relatively light force while bending and deforming the nodes in the stay tube. As a result, the axial force can be satisfactorily transmitted by the wire core member in which the bent portions are gently bent.

Next, according to a fourth aspect, in any one of the first to third aspects described above, the vehicle seat includes a detection device and a headrest moving mechanism at the time of a rear collision of the vehicle. The vehicle rear-end collision detection device is provided with the occurrence of a rear-end collision inside the seat back by receiving a backrest load that causes the back of the seated person to press against the seat back by the bounce when the rear-end collision occurs. It is detected as a mechanical operation movement amount by which the pressure receiving member is pushed. The headrest moving mechanism is provided inside the headrest, and by receiving the transmission of the mechanical operation movement detected by the detection device at the time of rearward collision of the vehicle, the headrest supporting portion that receives the head of the seated person is seated back. And move it closer to the head. The wire core member is provided as a transmission member for transmitting the mechanical operation movement amount detected by the detection device at the time of the rear collision of the vehicle to the headrest movement mechanism.
According to the fourth aspect of the invention, the wire core member transmits the mechanical operation movement amount, which is pushed by the pressure receiving member provided inside the seat back when the vehicle collides, to the headrest movement mechanism in the headrest by the push operation. To do.

The present invention can obtain the following effects by taking the above-described means.
First, according to the first invention, a plurality of bent portions bent in the same direction as the bent portion of the stay are formed on the wire core member, so that the nodes of the wire core member are bent and deformed with a relatively light force. It can be inserted into the stay pipe. Therefore, it is possible to easily insert the relatively rigid wire core member into the stay pipe formed in the bent shape.
Furthermore, according to the second invention, when one end of the wire core member is inserted to a position where it passes through the stay bent portion, at least one bent portion of the wire core member is located in the stay pipe. By forming in this way, it becomes easy to deform the wire core member into a shape following the in-pipe shape of the stay. Thereby, the wire core member can be more easily inserted into the pipe of the stay.
Further, according to the third invention, the curvature of each bent portion formed in the wire core member is made gentler than the curvature of the bent portion of the stay, so that the operability of the push operation of the wire core member is not lost. This can be easily inserted into the pipe of the stay.
Furthermore, according to the fourth invention, the wire core member as the operation force transmitting member for performing the moving operation for bringing the headrest close to the head at the time of rearward collision of the vehicle can be easily inserted into the stay.

  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 vehicle seat 1 according to 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 is received by 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. 14, the headrest moving mechanism 10 is always in a state where the forward movement of the support portion 4A is restricted as 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, and 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. Here, the push rod 50 corresponds to the wire core member of the present invention.
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 of the operation cable 40 is connected to a vehicle rear-end collision detection device disposed in the seat back 2, and is pulled downward when a rear-end collision occurs. It is designed to be operated. 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 at the time of vehicle rear collision for pushing the push rod 50 at the time of vehicle rear collision will be described.
That is, as shown in FIG. 3, a bent rod-shaped pressure receiving member 20 extending in the width direction is disposed in the inner middle portion of the seat back 2. The pressure receiving member 20 is pivotally supported at its right end in the figure on the right side frame Fs of the seat back 2 so as to be rotatable. The left end of the pressure receiving member 20 is pivotally supported by the left side frame Fs via a rotary damper 30 so as to be rotatable.
The pressure receiving member 20 is formed as a pressure receiving portion 21 whose middle portion in the width direction receives the backrest load of the seated person. The pressure receiving portion 21 is formed by being bent downward from an end portion on the right side of the figure, and is formed in a shape eccentric from the center of rotation. As a result, the pressure receiving member 20 receives the movement in which the pressure receiving portion 21 is pushed backward by receiving the backrest load of the seated person as the movement to be pushed around the rotation center on both ends. It has become.
Here, a torsion spring 20 </ b> S is hooked between an end portion on the right side of the pressure receiving member 20 and the side frame Fs. The torsion spring 20 </ b> S is provided in a state of being pre-twisted, and rotationally biases the pressure receiving member 20 by moving the pressure receiving portion 21 forward. Thus, the pressure receiving member 20 is held in a posture state in which the pressure receiving portion 21 is pressed against a cushion pad (not shown) provided on the backrest surface of the seat back 2.

A damper 30 that pivotally supports the left end portion of the pressure receiving member 20 in the figure so as to be rotatable with respect to the left side frame Fs has a known rotary damper structure. That is, the damper 30 has a configuration in which the rotation shaft 31 is inserted into the inside of the cylindrical case 32 and the rotation shaft 31 and the case 32 are assembled so as to be rotatable relative to each other.
The rotation shaft 31 has a connecting arm 31A formed at an end portion on the right side in the drawing and an end portion on the left side in the drawing of the pressure receiving member 20 integrally connected thereto. The left end of the rotation shaft 31 is pivotally supported by the left side frame Fs. Thus, the case 32 is pivotally supported by the rotation shaft 31 so as to be rotatable with respect to the side frame Fs. And the case 32 has the lower end part of the inner member 41 of the operation cable 40 mentioned later hung on the operation arm 32A formed in the outer peripheral surface part. The case 32 is restricted from moving in the direction in which the operating arm 32A comes into contact with the stopper 62 by making the operating arm 32A contact the stopper 62 of the mounting bracket 60 provided on the side frame Fs.
The damper 30 having the above configuration is filled with a viscous fluid such as silicon oil in a sealed state inside the case 32. Thus, a viscous resistance force corresponding to the magnitude of the rotation speed is applied between the rotation shaft 31 and the movement of the rotation shaft 31 relative to the case 32. ing. This viscous resistance force acts between the rotating shaft 31 and the case 32, and the magnitude of the viscous resistance force increases, so that the rotational force of the rotating shaft 31 is easily transmitted to the case 32.

Accordingly, the pressure receiving member 20 and the damper 30 operate as follows when a seated person on the vehicle seat 1 leans against the seat back 2.
That is, first, when the seated person leans on the seat back 2 at a normal time before the vehicle rear-end collision occurs, the pressure receiving member 20 pushes backward at a relatively moderate speed in response to the behavior of the seated person. Is done. Therefore, in this case, since the rotation shaft 31 rotates relative to the case 32 at a relatively slow speed, the rotational force of the rotation shaft 31 is not transmitted to the case 32, and the rotation shaft 31 It idles inside the case 32.
However, when a vehicle rear-end collision occurs, the occupant collides with the seat back 2 with the momentum, so that the pressure receiving member 20 is pushed rearward at a relatively abrupt speed in response to the jerky movement. Turned. Therefore, in this case, since the rotation shaft 31 rotates relative to the case 32 at a relatively high speed, the case 32 receives the rotational force from the rotation shaft 31 and is integrated therewith. And turn. As a result, the case 32 is pulled by pulling the lower end portion of the inner member 41 of the operation cable 40 hooked on the operation arm 32A downward.
Then, as shown in FIG. 1, when the lower end portion of the inner member 41 of the operation cable 40 is pulled, this operating force is transmitted to the upper end portion of the inner member 41, and the push rod is moved inside the support 2S. 50.

Next, a transmission structure for transmitting an operation force 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 operation cable 40 has a lower end portion of the outer member 42 fixed on an outer mounting portion 61 of the mounting bracket 60, and a lower end portion of the inner member 41 is the damper 30 described above. The operating arm 32A is attached to the operating arm 32A. As a result, the operation cable 40 is pulled so that the lower end portion of the inner member 41 is pulled out from the lower end portion of the outer member 42 in accordance with the movement of the pressure receiving member 20 and the damper 30 when the rear collision of the vehicle occurs. It has become.
As shown in FIG. 4, the operation cable 40 has a push rod inside the stay 4 </ b> B 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. 5 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. 4, 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 shape of the end portion of the insertion groove Sd indicated by a solid line on the front side of the drawing shown in FIG. 4 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. Then, when the operation cable 40 is turned around in the circumferential direction along the curved shape of the terminal end when it reaches the end of the insertion groove Sd, Sd, as shown in FIG. 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. 4, the upper end portion of the outer member 42 is formed of a 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. 5, slit-like receiving grooves Bd and Bd extending in the axial direction from the lower end of the stay 4B inserted through the support 2S are formed through the peripheral wall of the stay 4B. . 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.
Accordingly, as shown in FIG. 6, the engagement protrusions 41P and 41P of the inner member 41 are formed by bending the receiving grooves Bd and Bd by 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. 7, the stay 4 </ b> B is provided with a concave locking groove Bk formed in a notch on the outer peripheral wall thereof, which 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. 7, the lower end portion of the push rod 50 inserted into the tube of the stay 4B and the head of the outer member 42 of the operation cable 40 inserted from below into the tube of 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 structural relationship between the stay 4B and the push rod 50 inserted into the stay 4B and the insertion structure for inserting the push rod 50 into the stay 4B will be described.
That is, as shown in FIG. 8, the push rod 50 is inserted into the tube of the stay 4 </ b> B formed in a hollow tubular shape, and can transmit the axial operation force pushed up from the lower end side to the upper end portion. It is like that.
Here, FIG. 9 shows the configuration of each of the push rod 50 and the stay 4B in detail. As shown in the figure, the stay 4B is formed in a hollow tubular shape, and a bent portion Bj whose central axis is bent in a “く” sign shape is formed at a middle portion in the longitudinal direction. Accordingly, the stay 4B is formed in a bent shape in which the upper half portion is inclined forward with respect to the lower half portion. The stay 4B is formed of a metal member and has a rigid structure that does not bend and deform during use.
On the other hand, the push rod 50 is formed in an elongated rod shape that can be inserted into the pipe of the stay 4B. The push rod 50 is formed of a metal member, and has a configuration having rigidity that allows the lower end portion to transmit an operating force pushed in the axial direction to the upper end portion. However, since the push rod 50 is formed in the shape of an elongated rod, it can be elastically bent and deformed by applying a force to bend and deform it by human force.
Therefore, in order to make it easy to insert the push rod 50 formed with such relatively high rigidity into the bent stay 4B, the push rod 50 has a plurality of portions in the length direction of the stay 4B. It is formed in a shape bent according to the bent shape. That is, the push rod 50 is bent and formed as described above, so that the push rod 50 can easily enter along the bent shape in the stay 4B pipe and bend and deform along the bent shape in the stay 4B pipe. It has become easier. Thereby, as shown in FIGS. 10 to 13, when the push rod 50 is inserted into the tube of the stay 4 </ b> B, the bent shape is made to follow the bent shape of the stay 4 </ b> B, Further, the bent nodes are bent and deformed following the shape of the stay 4B in the tube, so that they can be easily inserted into the tube of the stay 4B.

Specifically, as shown in FIG. 9, the push rod 50 has five bent portions from a first bent portion 51 to a fifth bent portion 55 between its lower end portion and upper end portion. The first bent portion 51 to the fifth bent portion 55 are formed by plastic deformation by bending the push rod 50. The first bent portion 51 to the fifth bent portion 55 are each formed with a gentler curvature than the bent portion Bj formed on the stay 4B. Here, the first bent portion 51 is formed to bend in the opposite direction (right direction in the drawing) to the bending direction (left direction in the drawing) of the stay 4B, and the second bent portion 52 to the fifth bent portion 55 are formed. The stay 4B is bent in the same direction as that of the stay 4B.
Next, the dimensions of each part of the push rod 50 and the stay 4B will be described. In addition, the height dimension and width dimension of each part shown below are dimensions based on the central axis of each part.
That is, the push rod 50 has an outer diameter 50R of 3.5 mm, a height 50H from the lower end to the upper end 197.5 mm, and a width 50W of 38.6 mm. The height dimension 51H from the lower end of the push rod 50 to the first bent part 51 is 20.5 mm, the height dimension 52H from the lower end to the second bent part 52 is 40.5 mm, and the width dimension 52W is 2 .8mm. The height dimension 53H from the lower end of the push rod 50 to the third bent part 53 is 85.5 mm, and the same width dimension is 2.8 mm, which is the same as the width dimension 52W of the second bent part 52. And the height dimension 54H from the lower end part of the push rod 50 to the 4th bending part 54 is 107.5 mm, and the same width dimension 54W is 0.6 mm. And the height dimension 55H from the lower end part of the push rod 50 to the 5th bending part 55 is 135.4 mm, and the width dimension 55W is 7.2 mm. In addition, each bending radius 51R-55R of the 1st bending part 51 to the 5th bending part 55 is 35 mm.
Next, the hollow tubular stay 4B has an outer diameter BT of 14 mm, an inner diameter BS of 11 mm, and a height dimension BH from the lower end to the upper end of 199.7 mm. The bending radius JR of the bent portion Bj is 48 mm.

The push rod 50 configured as described above is inserted into the pipe of the stay 4B as follows. That is, the push rod 50 is inserted at the lower end thereof into the pipe through the opening on the upper end side of the stay 4B, so that the stay 4B passes through the bent portion Bj of the stay 4B as shown in FIG. It is in a state of being abutted against the inner wall of the pipe. Thereby, push rod 50 will be in the state where resistance was given to the insertion. In this state, the push rod 50 is in a state where up to the third bent portion 53 among the five bent portions is inserted into the pipe of the stay 4B.
However, when a force is further applied to the push rod 50 in this direction from this state, as shown in FIG. 11, the push rod 50 has a rod shape based on a bent node following the bent tube shape of the stay 4B. Bend and deform. At this time, the push rod 50 is inserted by bending the stay 4B in the pipe by bending the second bent portion 52 bent in the same direction as the stay 4B from the fifth bent portion 55 as a base point. Deform into possible posture shape. At this time, the push rod 50 is in a state where at least one bent portion (the second bent portion 52 or the third bent portion 53 bent in the same direction as the stay 4B) is inserted into the tube of the stay 4B. Therefore, these bent portions make it easy to deform into a shape that can be easily inserted into the pipe of the stay 4B.
Accordingly, as shown in FIGS. 12 and 13, the push rod 50 is inserted into the tube of the stay 4 </ b> B with a relatively light force while being bent and deformed following the shape of the tube of the stay 4 </ b> B. The push rod 50 is finally inserted to the position shown in FIG. 8, and in its free state, the push rod 50 can maintain the state of being inserted into the pipe of the stay 4B due to its rigidity.

Here, as shown in FIG. 8, the push rod 50 is inserted into the pipe of the stay 4 </ b> B, and the peripheral wall between the second bent portion 52 and the third bent portion 53 or the fourth bent portion 54. And the fifth bent portion 55 are held in a posture state in which the peripheral wall is in contact with the inner wall of the stay 4B. That is, the push rod 50 is configured such that two or more of the bent peripheral walls are in contact with the inner wall of the stay 4B, and the posture state does not swing in the free state. Thereby, the push rod 50 can maintain the inserted position state without flapping in the radial direction or the axial direction in the pipe of the stay 4B.
The push rod 50 is positioned at the lower end portion by the first bent portion 51 so that the lower end portion of the push rod 50 is arranged on the central axis in the pipe of the stay 4B. Accordingly, as shown in FIG. 7, the push rod 50 is moved by the central portion of the head portion 42H of the outer member 42 located on the central axis of the stay 4B when the operation cable 40 is axially coupled to the stay 4B. A push operation is made.
Here, returning to FIG. 8, the resin wall 50 </ b> P is coated on the peripheral wall of the push rod 50. Thereby, the contact sound (abnormal noise) between the metals that the push rod 50 rubs against or strikes against the inner wall of the stay 4B is prevented.

Next, the headrest moving mechanism 10 will be described. Although the configuration of the headrest moving mechanism 10 is shown in FIGS. 14 to 20, the state of FIG. 17 best represents the configuration of each unit. 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. 20 shows a diagram seen from the direction of line XX in FIG. 17, that is, a diagram 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. 20, the rear ends of the connecting links 12 and 12 are sandwiched 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. 17, 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 connection links 12 and 12 abut on the upper surface portion 11U of the headrest base portion 4C by rotating clockwise from the state shown in FIG. 14 about the connection 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. 20, the rear ends of the support members 13, 13 are between the ribs 11R, 11R disposed on both outer sides and the ribs 11R, 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. 20) 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. 15, 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. 20, each of the hooks 14 and 14 is disposed between the side surface portions 11S and 11S and the ribs 11R and 11R inside thereof, and is spanned between them. Each of the connecting shafts 14A and 14A is rotatably supported.
Returning to FIG. 15, the upper and lower jaw portions 14 </ b> B and 14 </ b> C are formed on the outer peripheral edge portions of the hooks 14 and 14 at two locations in the circumferential direction. 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. As shown in FIG. 15, these torsion springs 14S and 14S are in a pre-twisted state, 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. 14, the connecting shaft 13A is urged in a direction to be pulled toward 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. 15, 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 rotated counterclockwise in the drawing to release the engagement state. It is rotated counterclockwise by the urging force of 14S. Thereby, as shown by the phantom line state of FIG. 15, 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 below. The posture is exposed in the holes 11H and 11H. Thereby, the locking state of the connecting shaft 13A by the hooks 14, 14 is released, and the connecting shaft 13A follows the shape of the long holes 11H, 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. 15, the engaging arm portions 15 </ b> C and 15 </ b> C for restricting the counterclockwise rotation of the hooks 14 and 14 are arranged side by side in the width direction so as to be engageable with the hooks 14 and 14. Has been. Specifically, as shown in FIG. 20, the engaging arm portions 15C and 15C are arranged so as to be sandwiched between the same side surface portions 11S and 11S 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. 15, the torsion spring 15S is in a pre-twisted state, and urges the engagement 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 drawing 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.

Returning to FIG. 14 again, the right end of the connecting shaft 15B connected integrally with the engaging arm portions 15C and 15C, that is, the end 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 each of 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. 17, the support portion 4 </ b> A reaches the upper end portions H <b> 3 and H <b> 3 of the long holes 11 </ b> H and 11 </ b> H, so that the forward movement is restricted and stopped. . 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. 16, 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. 16 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. 14, a pair of lever members 17, 17 formed of a horizontally long plate-like member is disposed on the headrest base 4 </ b> C. 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. 20, the lever members 17, 17 are formed between the ribs 11 </ b> R, 11 </ b> R whose rear ends are arranged on both outer sides and the ribs 11 </ b> R, 11 </ b> R on the inner side thereof. 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. 14, the 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 a 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. 16, 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 from the lower end portions H0 and H0 upward. The long holes 11H and 11H are pushed out of the holes by being pushed away. However, as shown in FIG. 17, 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. 18, the receiving portions 17B and 17B have a connecting shaft 13A that is moved in the long holes 11H and 11H downward from the upper end portions H3 and H3, so 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. 19, 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. 15, the hooks 14 and 14 are pushed in the clockwise direction in the drawing to be in a posture state in which 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. Then, when the rear collision of the vehicle occurs, the pressure receiving member 20 is pushed backward by receiving the backrest load of the seated person 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. 17 to the collision corresponding position shown in FIG. 17 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.

Thus, according to the vehicle seat 1 of the present embodiment, the push rod 50 that is the wire core member is bent in the same direction as the bent portion Bj of the stay 4B (from the second bent portion 52 to the fifth bent portion). 55), the nodes of the push rod 50 can be inserted into the stay 4B while being bent and deformed with a relatively light force. Therefore, it is possible to easily insert the push rod 50 having relatively high rigidity into the tube of the stay 4B formed in a bent shape.
Further, when the lower end portion (one end portion) of the push rod 50 is inserted to a position passing through the bent portion Bj of the stay 4B, at least one bent portion (second bent portion 52 and third bent portion 52) of the push rod 50 is inserted. By forming the bent portion 53) so as to be located in the pipe of the stay 4B, the push rod 50 can be easily deformed into a shape following the shape of the stay 4B in the pipe. Thereby, the push rod 50 can be more easily inserted into the pipe of the stay 4B.
Furthermore, by forming a plurality of bent portions (the second bent portion 52 to the fifth bent portion 55) on the push rod 50, the curvature of each bent portion can be made gentler than the bent portion Bj of the stay 4B. The push rod 50 is inserted into the tube of the stay 4B with a relatively light force while bending and deforming the nodes in the tube of the stay 4B. Therefore, the push rod 50 can be easily inserted into the stay 4B without breaking the operability of the push operation.

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, the wire core member of the present invention can be used for other purposes such as tilting the headrest in addition to the operation for moving the headrest forward when a vehicle rear-end collision occurs. .
Moreover, although the example in which the five bending parts were formed in the wire core member was shown, as long as the number of these bending parts is two or more, it does not matter how many. At this time, all of the bent portions are not necessarily formed with the same curvature, and may be larger than the curvature formed on the stay.

1 is a perspective view illustrating a schematic configuration of a vehicle seat according to Embodiment 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 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 VII-VII sectional view taken on the line of FIG. It is a state figure showing the state where the push rod was inserted in the pipe | tube of a stay. It is a side view showing the composition of a push rod and a stay. It is a state figure showing the state by which the push rod was penetrated to the position which passes the bending part in a stay pipe | tube. FIG. 11 is a state diagram illustrating a state where the push rod is further inserted into the pipe of the stay from the state of FIG. 10. FIG. 12 is a state diagram illustrating a state in which the push rod is further inserted into the pipe of the stay from the state of FIG. 11. FIG. 13 is a state diagram illustrating a state in which the push rod is further inserted into the pipe of the stay from the state of FIG. 12. 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. 14 from the XV-XV line cross section of FIG. FIG. 16 is a side view showing a state in the middle of the headrest support portion moving close to the head from the state of FIG. 15. It is a side view showing the state where the support part of the headrest has finished approaching toward the head. It is the side view showing the state in the middle of returning the support part of a headrest toward the initial position from the state of FIG. 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 XX 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 4 Headrest 4A Bearing part 4B Stay Bk Locking groove Bd Reception groove Bj Bending height Bj Dimension BW Width BS Inner diameter BT Outer diameter JH Height JR Flex radius 4C Headrest base 10 Headrest moving mechanism 11B Rear surface 11D Bottom surface 11S Side surface 11U Upper surface 11R Rib 11H Long hole H0 Lower end H1 First stopper Groove H2 Second stopper groove H3 Upper end portion 12 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 15 B connecting shaft 15C engaging arm portion 15S torsion spring 16 tension spring 17 lever member 17A connecting shaft 17B receiving portion 17S torsion spring 20 pressure receiving member 20S torsion spring 21 pressure receiving portion 30 damper 31 rotating shaft 31A connecting arm 32 case 32A operation arm 40 Operation cable 41 Inner member 41P Engagement protrusion 42 Outer member 42S Long hole 42H Head 42D Swelling part 50 Push rod (wire core member)
50P Resin coating 50H Height dimension 50W Width dimension 50R Outer diameter dimension 51 1st bending part 51H Height dimension 51R Bending radius 52 2nd bending part 52H Height dimension 52W Width dimension 52R Bending radius 53 3rd bending part 53H Height dimension 53R Bending radius 54 Fourth bending part 54H Height dimension 54W Width dimension 54R Bending radius 55 Fifth bending part 55H Height dimension 55W Width dimension 55R Bending radius 60 Mounting bracket 61 Outer mounting part 62 Stopper

Claims (4)

An insertion structure of a wire core member for inserting a wire core member formed in a long shape in the axial direction into a tube of a hollow tubular stay provided integrally with a headrest of a vehicle seat,
The hollow tubular stay is formed with a bent portion with a central axis bent at an intermediate position in the length direction thereof,
In a state where the wire core member is inserted into the pipe of the stay, the end on one side is pressed in the axial direction toward the end on the other side, so that the axial pressing force is applied to the other side. It has a configuration that enables push operation with rigidity that can be transmitted to the end,
An insertion structure for a wire core member, wherein the wire core member is formed with a plurality of bent portions whose central axis is bent in the same direction as the bent portion of the stay at an intermediate position in the length direction. The wire core member insertion structure according to claim 1,
At least one bent portion formed in the wire core member is in a state where an end portion on one side of the wire core member is inserted from an opening portion on one side of the stay to a position passing through the bent portion of the stay. Then, the insertion structure of the wire core member characterized by being arrange | positioned so that it may be located in the pipe | tube of this stay. The wire core member insertion structure according to claim 1 or 2,
The insertion structure of the wire core member, wherein the curvature of each bent portion formed in the wire core member is gentler than the curvature of the bent portion of the stay. The wire core member insertion structure according to any one of claims 1 to 3,
The vehicle seat is
Mechanical operation in which the pressure receiving member provided inside the seat back is pushed by receiving a backrest load in which the back of the seated person is pressed against the seat back by the spring when the rear collision occurs A detection device at the time of a vehicle rear-end collision that can be detected as a movement amount;
The headrest support portion that receives the head of the seated person is moved relative to the seat back by receiving the transmission of the mechanical operation moving amount detected by the detection device at the time of the rear collision of the vehicle, and close to the head. A headrest moving mechanism provided inside the headrest that can be
The wire core member is provided as a transmission member for transmitting a mechanical operation movement amount detected by the detection device at the time of a rear collision of the vehicle to the headrest moving mechanism. Construction.

Images