JP4929974B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat that detects a change in behavior of an occupant seated on a seat at the time of a vehicle rear-end collision and relatively moves a support portion of a headrest that receives the occupant's head so as to be close to the head.

2. Description of the Related Art Conventionally, some seats for automobile seats employ an active headrest that can support a passenger's head by instantaneously moving the headrest forward when a rear-end collision of the vehicle occurs. Here, as a moving mechanism that moves the headrest forward when a vehicle collision occurs, a mechanism that is operated in accordance with a pulling operation of a cable member as a mechanical transmission mechanism is known.
The operation cable as a mechanical transmission mechanism attached to the headrest moving mechanism has a double structure in which a linear inner member is inserted into a tubular outer member, and the end of the operation side to be pulled is operated. The part is routed inside the seat back. In the case of a rear-end collision of the vehicle, the operation cable receives a backrest load applied to the back of the occupant against the seat back, so that the operation-side end arranged inside the operation cable is pulled. ing. Thus, the operation cable is routed through the inside of the headrest and the inside of the seat back. Therefore, when the headrest is configured to be detachable with respect to the seat back, the operation cables are preliminarily divided and routed inside, and the ends are connected to each other when the headrest is mounted. Therefore, it is necessary to devise such that the routing work can be easily performed.
Here, the following Patent Document 1 discloses a technique that allows connecting electrical wirings arranged inside a stay, which serves as a support for a headrest, by inserting the stay into a support installed on the upper part of the seat back. Is disclosed. In this disclosure, the connecting end of the electrical wiring is held in a standby state inside the support. The stay is inserted into the cylindrical shape of the support, whereby the ends of both wirings are axially connected to each other and the holding state of the wiring end with respect to the support is released. Thereby, the axial movement within the support of both wirings is allowed, and the stay can be further inserted into the cylindrical shape of the support.
JP 2003-299549 A

  However, in the prior art disclosed in the above-mentioned Patent Document 1, after both wires are axially connected, a stay is further inserted so that both wires can move within the support together with the stay. The structure is complicated. Further, when the headrest is configured to be detachable with respect to the seat back, both wirings must be releasably connected so as to be able to cope with this detachable movement, which further complicates the structure.

  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 mechanical transmission mechanism for performing a headrest moving operation at the time of a vehicle rear-end collision. According to the configuration, the headrest can be releasably connected so as to be able to cope with an attaching / detaching movement operation with respect to the seat back.

In order to solve the above problems, the vehicle seat of the present invention takes the following means.
First, the first invention is a vehicle that detects a change in behavior of an occupant seated on a seat at the time of a rear-end collision and moves a support portion of a headrest that catches the occupant's head so as to be close to the head. It is a seat for vehicles, and is provided with the detection apparatus and headrest moving mechanism at the time of vehicle rear collision. The detection device at the time of a rear-end collision detects a change in the behavior of an occupant seated on a seat at the time of a rear-end collision as a mechanical operation movement amount. The headrest moving mechanism is moved relative to the headrest support portion in proximity to the head by transmitting the mechanical operation movement amount detected by the detection device at the time of rear-end collision through the mechanical transmission mechanism. It can be made to. The mechanical transmission mechanism includes a first transmission mechanism provided on the seat back side and a second transmission mechanism provided on the headrest side. Between the first transmission mechanism and the second transmission mechanism, there is provided a connecting means capable of setting the transmission mechanism between the two transmission mechanisms or separating them. The connecting means is configured to operate in accordance with the amount of mechanical operation movement from the detection device at the time of a vehicle rear-end collision, and is normally in a disconnected state in which both transmission mechanisms are separated, but a vehicle rear-end collision is detected. When connected, the two transmission mechanisms are connected. The second transmission mechanism is connected to a headrest moving mechanism in which a transmission mechanism member on one end side is disposed inside the headrest. The transmission mechanism member on the other end side is inserted into a cylindrical stay serving as a headrest column. Accordingly, the second transmission mechanism is configured to operate together with the stay as the stay is inserted into and removed from the upper portion of the seat back. In the first transmission mechanism, the mechanical operation movement amount at the time of the vehicle rear-end collision detected by the detection device at the time of vehicle rear-end collision corresponds to the transmission mechanism member on the other end side of the second transmission mechanism as the traction operation. It is transmitted to the transmission member arranged in this way. The coupling means is provided between the transmission mechanism member on the other end side of the second transmission mechanism and the transmission member of the first transmission mechanism, and the first transmission in the transmission state between the two transmission mechanisms by the coupling means. The second transmission mechanism is pulled by the mechanism. The detection device at the time of a vehicle rear impact is a pushing member that is provided in the seat back and is pushed and moved in accordance with a behavior change at the time of the vehicle rear impact of an occupant seated on the seat. The first transmission mechanism is connected to a pushing member, and in conjunction with the movement of the pushing member, an operation cable as a transmission mechanism member on the other end side of the second transmission mechanism inserted into the seat back together with the stay. It is configured as a traction operation mechanism that pulls to retract. The traction operation mechanism has a slide member as a transmission member and a connecting member. The slide member is provided on the seat back and is slidable in a direction in which the headrest stay is inserted and removed. The connecting member is provided in the form of connecting the slide member and the pushing member, and transmits the movement of the pushing member at the time of the rear impact of the vehicle to slide the slide member in the stay insertion direction. An opening is formed through the circumferential wall of the stay along the longitudinal direction thereof, so that an operation cable inserted from the inside of the opening into the stay is exposed. The connecting means includes a protrusion formed on the peripheral surface of the operation cable by inserting the slide member into the opening of the stay as the slide member slides in the insertion direction in conjunction with the movement of the push member. The engaging structure is configured to be engaged, and the operation cable is pulled by the movement of pulling the protrusion in the insertion direction.

According to the first aspect of the present invention, the connecting means includes the first transmission mechanism provided on the seat back side and the second transmission mechanism provided on the headrest side at all times before the vehicle rear-end collision occurs. The connected state is cut off. Therefore, in this state, it is possible to install or remove freely headrest relative to the seat back. Then, when the vehicle rearward collision occurs, the connecting means operates according to the mechanical operation movement amount from the detection device at the time of the vehicle rearward collision, and powers the first transmission mechanism and the second transmission mechanism. Switch to a connectable state. As a result, the mechanical operation movement amount detected by the detection device at the time of the rear collision of the vehicle is transmitted to the headrest movement mechanism, and the support portion of the headrest is moved. Specifically, the transmission mechanism member on the other end side of the second transmission mechanism provided on the headrest side is disposed inside the seat back by inserting the stay into the upper portion of the seat back. This transmission mechanism member transmits the mechanical operation movement amount to the headrest movement mechanism by being pulled by the transmission member of the first transmission mechanism provided on the seat back side at the time of rearward collision of the vehicle. The connection state of the transmission member of the first transmission mechanism and the transmission mechanism member of the second transmission mechanism is switched between the transmission state and the separation state by a connecting means provided therebetween. The slide member as the pulling operation mechanism slides in the direction in which the stay is inserted by receiving the transmission of the movement of the push member by the connecting member. Then, as the slide member moves, the slide member enters the opening formed in the stay, engages with the protrusion of the operation cable inside, and pulls this.

Next, the second invention, in the first invention described above, protrusions are protruded peripheral surface of the operating cable, a plurality set along the longitudinal direction of the operating cable. The plurality of protrusions are exposed from an opening formed on the peripheral wall of the stay. Thereby, even if the insertion amount of the stay with respect to the seat back is changed, the slide member enters the opening portion in accordance with the movement in the insertion direction and can be engaged with any of the protrusions.
According to the second aspect of the present invention, the slide member can be inserted into the opening and engaged with the protrusion of the operation cable even when the amount of stay inserted into the seat back is changed. Therefore, even if the height position of the headrest is adjusted, it is possible to perform the pulling operation of the operation cable at the time of the rear collision of the vehicle.

Next, according to a third aspect, in the second aspect described above, the plurality of protrusions that are formed to protrude from the peripheral surface of the operation cable include any one of the protrusions when sliding in the insertion direction of the slide member. In order to shorten the distance required to engage, the distance between them is set close.
According to the third aspect of the present invention, since the plurality of protrusions formed on the operation cable are set with a close interval therebetween, the slide member can be moved to any one of the protrusions with a small movement amount at the time of rearward collision of the vehicle. To engage and pull the operation cable.

Next, according to a fourth aspect of the present invention, in any one of the first to third aspects described above, the slide member of the traction operation mechanism has a shape folded back in a V shape so as to be sandwiched, and the seat back The mounting structure is configured to be elastically constricted or restored and expanded by moving the inside of the mounting frame provided in the frame and sliding it in the direction of sliding. A plate-like engagement plate, which is inwardly facing each other, is formed as a connecting means at both tip side portions of the slide member that are folded back in a V shape. As the slide member slides in the insertion direction, the engagement plates formed at both ends of the slide member enter the opening formed in the stay and pinch the operation cable inserted therethrough. It is configured to engage in the insertion direction with a protrusion formed in a pedestal shape.
According to the fourth aspect of the present invention, the slide member formed as a V-shaped clamping member having plate-like engagement plates at both tip side portions is provided with both engagement plates as the slide movement in the insertion direction occurs. The peripheral surface of the operation cable is clamped from both sides by inserting it into the opening of the stay. Thereby, the slide member is in a state in which both engagement plates are engaged with the pedestal-shaped protrusions formed on the operation cable in the insertion direction.

The present invention can obtain the following effects by taking the above-described means.
First, according to the first aspect of the present invention, the connection state between the first transmission mechanism installed on the seat back side and the second transmission mechanism installed on the headrest side is always separated by the connection means, and the rear of the vehicle. With a simple configuration in which a transmission state is established when a collision occurs, both mechanical transmission mechanisms can be releasably connected so as to be able to respond to the movement of attaching and detaching the headrest with respect to the seat back.
Further, according to the second invention, by which to set a plurality of projections on the operation cable as engaged and also the slide member by changing the insertion amount of the stay, the height position of the headrest Even if the adjustment is performed, the operation cable can be pulled at the time of the rear collision of the vehicle.
Furthermore, according to the third invention, since the plurality of protrusions formed on the operation cable are set with a small interval, the amount of operation movement required for the slide member can be reduced. Can be increased.
Furthermore, according to the fourth aspect of the invention, the operation cable is engaged with the slide member formed as a V-shaped holding member so as to be sandwiched from both sides, thereby stabilizing the engagement state with the operation cable. The operability can be further enhanced.

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

First, the vehicle seat of Example 1 will be described with reference to FIGS.
The seat 1 according to the present embodiment includes a seat back 2 that serves as a backrest portion for an occupant, a seat cushion 3 that serves as a seating portion, and a headrest 4 that serves as a receiving portion for the head. In addition, in each figure of FIGS. 1-12, in order to make the structure of the seat 1 intelligible, the internal structure of the seat back 2 and the headrest 4 is represented.
Here, the headrest 4 has two rod-like stays 4B, 4B erected at the lower part thereof in the insertion holes Sa, Sa of the cylindrical supports 2S, 2S installed at the upper part of the seat back 2. Each is inserted into the upper part of the seat back 2 by being inserted. The supports 2S and 2S are integrally fixed to an upper frame Fu that forms an upper arm of a back frame 2F that forms a skeleton of the seat back 2.
The headrest 4 is normally held in the installed posture position so that the head of the occupant seated on the seat 1 can be received at the rear side position. However, the headrest 4 is configured such that, when a rear collision of the vehicle occurs, the front-side support portion 4A that receives the head can be instantaneously moved forward. That is, when the rear collision occurs, the support portion 4A can be moved closer to the back of the back of the head with respect to the occupant in a sitting posture with the body floating forward from the seat back 2 or the headrest 4. ing. Thereby, when a rear collision occurs, it is possible to prevent the head from being tilted too much backward by that momentum, and the load on the neck can be reduced.

The forward movement operation of the support portion 4 </ b> A at the time of the vehicle collision is performed by the headrest moving mechanism 10 incorporated in the headrest 4.
Here, in FIG. 6, the appearance of the headrest moving mechanism 10 is shown in a side view. As shown in the figure, the headrest moving mechanism 10 keeps the support portion 4A in the initial state posture state in a state where the forward movement is restricted before the vehicle collision occurs.
When the vehicle collision occurs, the headrest moving mechanism 10 cancels the forward movement restriction state of the support portion 4 </ b> A and moves the support portion 4 </ b> A forward and upward by the bias of the tension spring 16. Accordingly, as shown in FIG. 9, the headrest moving mechanism 10 moves the support portion 4 </ b> A to the collision-corresponding position where the support portion 4 </ b> A is approached to just behind the back of the head. Here, in the state where the headrest moving mechanism 10 has moved the support portion 4A to the position corresponding to the collision, the support portion 4A is moved rearward even if a load in which the head of the occupant tilts backward due to the occurrence of the vehicle collision is received. It is not pushed back. As a result, the head of the occupant can be stably received by the support portion 4A held at the collision corresponding position. Details of the headrest moving mechanism 10 will be described later.

By the way, returning to FIG. 6, the operation for releasing the restriction state of the support portion 4 </ b> A described above is performed by a pulling operation of the operation cable 50 connected to the headrest moving mechanism 10. The operation cable 50 is formed as a rod-like member that is highly rigid and hardly deformed, and an upper end thereof is routed inside the headrest 4 and connected to the headrest moving mechanism 10. As shown in FIG. 2, the lower end of the operation cable 50 is inserted into a cylindrical stay 4B on the left side in the drawing, which serves as a support for the headrest 4, and the stay is connected to the upper end side by the connecting structure described above. 4B is suspended from the inside. Here, a bush Bb is provided at the lower end of the stay 4B, and the operation cable 50 inserted into the stay 4B is positioned so as to be slidable to the axial position. The operation cable 50 is configured such that the shape of the lower end side portion thereof is exposed from the side portion of the stay 4B through openings Bw and Bw formed through the peripheral wall of the stay 4B.
The operation cable 50 having the above-described configuration is configured such that the lower end portion of the operation cable 50 is inserted into the shape of the seat back 2 as the headrest 4 is inserted into the supports 2S and 2S. . The operation cable 50 inserted into the shape of the seat back 2 is engaged and pulled downward by a traction operation mechanism 40 provided inside the seat back 2 when a vehicle collision occurs. ing.

Here, as shown in FIG. 4, the traction operation mechanism 40 includes a slide member 41 formed in a V shape and a connecting cable 42 that performs the traction operation of the slide member 41. Here, the connecting cable 42 corresponds to the connecting member of the present invention.
The connecting cable 42 has a double structure in which a linear inner member 42A having flexibility is inserted through a tubular outer member 42B. The upper end of the outer member 42B is fitted into the mounting bracket 2C that is fixed to the reinforcing plate Ft of the back frame 2F, and the connecting cable 42 is held in an integral state in the axial direction. Yes. The upper end portion of the inner member 42A is hooked to the slide member 41 by the hook AF. As shown in FIG. 3, the lower end portion of the outer member 42B is fitted into the outer fixing piece Bt of the mounting bracket 2B fixed to the side frame Fs, and is integrated with the outer fixing piece Bt in the axial direction. Is held. And the lower end part of 42 A of inner members is connected with the mechanism in which this can be pulled at the time of a vehicle collision.
As shown in FIG. 1, the connecting cable 42 has a configuration in which both the inner member 42 </ b> A and the outer member 42 </ b> B are flexible. The connecting cable 42 is routed along the left side frame Fs of the back frame 2F in the drawing. Specifically, the connecting cable 42 is routed in a curved posture so as to avoid various structures (not shown) such as air conditioning disposed in the seat back 2.
Next, as shown in FIG. 5, the slide member 41 formed in a V shape is pulled downward along with the movement of the connecting cable 42 described above when the rear collision of the vehicle occurs, The clamping operation is performed so as to narrow the V-shape. As a result, the traction operation mechanism 40 inserts the slide member 41 into the openings Bw and Bw of the stay 4B and engages the operation cable 50, and also pulls the slide member 41 downward to operate the operation cable 50. Tow down. Here, as shown in FIG. 4, the traction operation mechanism 40 is in a state before the slide member 41 is sandwiched and operated in a normal state before the vehicle collision occurs. The combined state has been released from separation. Therefore, in this state, it is possible to freely move the stays 4B and 4B with respect to the supports 2S and 2S, and to freely attach and remove the headrest 4 to and from the seat back 2. It has become.
Hereinafter, a mechanism structure for pulling the operation cable 50 by the pulling operation mechanism 40 when a rearward collision of the vehicle occurs will be described.

That is, as shown in FIG. 4, the slide member 41 of the traction operation mechanism 40 is formed in a shape obtained by bending a plate member into a V shape. The slide member 41 maintains a V-shaped open shape in its free state, and is elastically constricted by applying a force so as to narrow the V-shaped open shape. Yes. As shown in FIG. 1, the slide member 41 is assembled to a mounting wire 2 </ b> W stretched on the back frame 2 </ b> F that has high rigidity and is difficult to be deformed via a metal mounting frame T. Here, in FIG. 2, the assembly structure of the slide member 41 is shown in an exploded perspective view. As shown in the figure, the slide member 41 is assembled in a state where the slide member 41 is inserted into the mounting frame T with its V-shaped folded portion facing downward. Here, the mounting frame T is integrally welded to the mounting wire 2W, and a resin bush W for reducing sliding friction with the slide member 41 is fitted inside the frame. Further, the mounting frame T is formed to be narrower than the V-shaped open shape of the slide member 41, and the slide member 41 is elastically engaged by the elastic force of the slide member 41 to maintain the V-shape. It can be stopped. Therefore, by sliding the V-shaped slide member 41 in the insertion / removal direction with respect to the mounting frame T, the V-shaped open shape can be elastically narrowed or restored to be expanded. The slide movement direction of the slide member 41 is the same as the direction in which the stay 4B is inserted and removed.
By the way, plate-like engagement plates 41A and 41A projecting inwardly from each other are formed at both V-shaped tip portions of the slide member 41. As shown in FIG. 5, these engagement plates 41 </ b> A and 41 </ b> A enter the openings Bw and Bw of the stay 4 </ b> B and are inserted into the inside by the movement of narrowing the V-shaped open shape of the slide member 41. The operation cable 50 is sandwiched from both sides. Here, a plurality of (for example, three) disc-shaped protrusions 50A are integrally provided at the lower end portion of the operation cable 50 exposed from the openings Bw and Bw of the stay 4B. The protrusions 50A abut against the upper surfaces of the engagement plates 41A and 41A that move so as to sandwich the operation cable 50 from both sides as the slide member 41 slides in the insertion direction of the stay 4B. Make contact. As a result, the slide member 41 and the operation cable 50 are engaged in the insertion direction. Therefore, by this engagement, it is possible to pull down the operation cable 50 by pulling the operation cable 50 with the sliding movement of the slide member 41 in the insertion direction.

Here, a plurality of protrusions 50 </ b> A provided integrally with the operation cable 50 are arranged side by side in the axial length direction (longitudinal direction) of the operation cable 50. As a result, even if the movement of changing the insertion amount of the stays 4B and 4B into the supports 2S and 2S in order to adjust the height position of the headrest 4, any of the protrusions 50A is engaged with the slide member 41. It is designed to be positioned at the position where it can be combined. The adjustment movement of the amount of insertion of the stays 4B and 4B into the supports 2S and 2S can be performed by pressing the knob Sb provided on the left support 2S in FIG. Here, the knob Sb is configured integrally with a locking claw (not shown) configured to protrude into the insertion port Sa of the support 2S, and is always engaged before the pushing operation. The pawl is held in a state of protruding into the insertion port Sa. In this state, the locking claw can be locked in a locking groove (not shown) formed in the stay 4B on the left side in the drawing, and the movement of the stay 4B in the insertion direction can be restricted. Then, by pushing the knob Sb from this locked state, the locking claw can be retracted out of the insertion port Sa, and the movement restriction state in the insertion direction with respect to the stay 4B is released. Can do. In addition, when the knob Sb is provided on the supports 2S and 2S on both sides, respectively, the movement of the stays 4B and 4B on both sides in the insertion direction can be restricted. However, the push-in operation for releasing the above-described locked state is possible. Must be performed at the same time on the left and right, which makes the operation cumbersome. Therefore, the knob Sb is provided only on the support 2S on one side from the viewpoint of operability. The reason why the knob Sb is provided on the left support 2S in the drawing is as follows. That is, when the restriction force of the locking claw is applied to the stay 4B on the side where the operation cable 50 is inserted, the stay 4B on the opposite side that is not regulated is supported when the headrest 4 is loaded. However, such deformation does not occur in the left stay 4B, which is restricted. Therefore, the stay 4B on the side where the operation cable 50 is inserted can be stably fixed with respect to the support 2S on the left side in the drawing.
The openings Bw and Bw formed in the stay 4B are formed to extend in the axial length direction (longitudinal direction) so that all of the above-described protrusions 50A can be exposed to the outside.
Further, the interval between the protrusions 50A is set by narrowing the interval in order to shorten the distance required to engage with any of the protrusions 50A when the slide member 41 slides in the insertion direction. Has been.

Next, a mechanism for pulling the lower end of the connection cable 42 will be described with reference to FIG. As shown in the figure, inside the seat back 2, a bending rod-like pushing member 20 extending in the width direction is disposed in the middle part thereof.
The pushing member 20 is formed in a shape in which a middle portion in the width direction is bent downward, and is formed as a receiving arm 21 that receives the backrest load of the occupant. The pushing member 20 is supported at its right end in the plane of the paper by the side frame Fs on the right side in the plane of the back frame 2F that forms the skeleton of the seat back 2 so as to be pivotable. Specifically, a torsion spring 20S is hung between the end of the pushing member 20 on the right side in the drawing and the side frame Fs. The torsion spring 20S is provided in a state of being pre-twisted, and urges the pushing member 20 to rotate in a direction in which the receiving portion 21 is moved forward. As a result, the pushing member 20 is held in a state where the rotation by the urging is restricted at a position where it comes into contact with a cushion pad (not shown) provided on the backrest surface of the seat back 2. Further, the pushing member 20 is rigidly coupled at its left end in the drawing to the connecting arm 31A of the damper 30 disposed on the left side frame Fs.
Here, the damper 30 has a rotary structure including a rotating shaft 31 and a cylindrical case 32. Specifically, the rotation shaft 31 is connected to the case 32 so as to be pivotable in a shape inserted into the cylindrical shape of the case 32. A viscous fluid such as silicone oil is filled in a sealed state between the cylindrical case 32 and the rotating shaft 31. The viscous fluid transmits the rotational force of the rotating shaft 31 to the case 32 by its viscous resistance depending on the relative rotation speed of the rotating shaft 31 with respect to the case 32, or the rotating shaft 31 is transferred to the case 32. It has the characteristic that it can be swayed internally to cut off transmission.
The rotation shaft 31 is supported by the side frame Fs on the left side in the drawing so that the shaft can rotate. Specifically, the rotation shaft 31 is pivotally supported at a position coaxial with the position where the right end of the pushing member 20 in the drawing is pivotally supported. The rotating shaft 31 is integrally connected to the connecting arm 31A formed to extend outward in the radial direction by rigidly coupling the left end portion of the pushing member 20 described above. ing. As a result, the pushing member 20 is supported by the both side frames Fs and Fs so as to be pivotable by the shaft support structures at both ends arranged on the same axis.

The pushing member 20 configured as described above receives a backrest load from the occupant at the receiving arm 21. The pushing member 20 receives the movement of the receiving arm 21 being pushed rearward by the backrest load of the occupant, and pivots the turning shaft 31 of the damper 30 integrally connected thereto. .
At this time, when the rotational speed of the rotational shaft 31 is a relatively slow speed that is received by the backrest load during normal seating use, the rotational force of the rotational shaft 31 is transferred to the case 32. Is not transmitted. However, when the rotational speed of the rotational shaft 31 is a high speed received by a relatively large backrest load caused by a vehicle collision, the rotational force of the rotational shaft 31 is transmitted to the case 32, and the case 32 Rotate integrally with this.
Here, the case 32 has a lower end portion of the inner member 42 </ b> A of the connecting cable 42 connected to an operation arm 32 </ b> A formed to extend outward in the radial direction, and is integrated with the case 32. . Accordingly, the case 32 performs a pulling operation of the inner member 42 </ b> A in the downward direction by rotating the shaft integrally with the rotating shaft 31. Thereby, as described above with reference to FIG. 6, the operation cable 50 is operated, and the restriction state of the support portion 4 </ b> A by the headrest moving mechanism 10 is released. Here, referring back to FIG. 1, the operating arm 32A of the case 32 described above is pressed by the torsion spring 20S by coming into contact with a stopper Bx of a bent plate-shaped mounting bracket 2B fixed to a side frame Fs described later. The rotational movement in the urging direction integral with the moving member 20 is restricted.

Next, the headrest moving mechanism 10 will be described. Although the configuration of the headrest moving mechanism 10 is shown in FIGS. 6 to 12, since the state of FIG. 9 well represents the configuration of each unit, the configuration of each unit will be described below using FIG. 9. . Here, in each figure of FIGS. 6-9, the right direction on the paper is the front of the vehicle.
As shown in FIG. 9, the headrest moving mechanism 10 includes a base 11, a pair of connecting links 12 and 12, a pair of support members 13 and 13, a pair of hooks 14 and 14, and an operation member 15. The tension spring 16 and a pair of avoidance guide lever members 17 and 17 are provided.
Specifically, the base 11 is made of synthetic resin, and is erected from a plate-shaped rear surface portion 11B, a plate-shaped bottom surface portion 11D extending forward from the lower end edge thereof, and left and right side edges thereof. The plate-like side surface portions 11S and 11S and the upper surface portion 11U formed in a shape connecting the upper edges of the both side surface portions 11S and 11S are integrally provided. Here, FIG. 12 shows a configuration diagram of the headrest moving mechanism 10 as seen from the Y line direction of FIG. 9. As shown in the figure, a plurality of plate-like ribs 11R, 11R, 11R, and 11R stand up from the rear surface portion 11B and the bottom surface portion 11D in parallel between the side surface portions 11S and 11S of the base 11. The base 11 is reinforced.
Returning to FIG. 9, the upper end portions of the stays 4B and 4B are inserted into the bottom surface portion 11D of the base 11 and fixed integrally therewith. These stays 4B and 4B are formed in a tubular shape, and are attached in such a manner that the opening on the upper end side is exposed on the upper surface side of the bottom surface portion 11D. Here, each stay 4B, 4B is formed in a bent shape in which the upper part from the middle of the stay 4B is inclined forward in the shape of a "ku".
In addition, through holes 11H and 11H having penetrating shapes penetrating in a wavy shape are formed in the side surface portions 11S and 11S described above. The elongated holes 11H and 11H are formed between first lower end portions H0 and H0 and upper end portions H3 and H3, and first stopper grooves H1 and H1 each having a concave shape stepped in the rear side (left side in the drawing). Second stopper grooves H2 and H2 are formed.

Next, the pair of connecting links 12 and 12 are made of synthetic resin, and are arranged side by side in the width direction so as to link the portion near the upper end of the base 11 and the portion on the rear surface side of the support portion 4A. It is installed. Specifically, the connecting links 12 and 12 are connected at their rear ends so as to be pivotable by connecting shafts 12 </ b> A extending in the width direction and penetrating the both side surfaces 11 </ b> S and 11 </ b> S of the base 11. More specifically, as shown in FIG. 12, the rear ends of the connecting links 12, 12 are the left and right side surfaces 11 </ b> S, 11 </ b> S formed on the base 11 and the ribs 11 </ b> R, 11 </ b> R formed inside them. They are arranged at positions sandwiched between them and supported by the connecting shaft 12A. Returning to FIG. 9, the connecting links 12 and 12 are connected so that the front ends of the connecting links 12 and 12 can be pivoted by a connecting shaft 12 </ b> B extending in the width direction connected to the rear surface side portion of the support portion 4 </ b> A. . Here, the connecting shafts 12A and 12B are arranged in parallel directions.
As shown in the figure, the connecting links 12 and 12 are brought into contact with the upper surface portion 11U of the base 11 by rotating counterclockwise from the state of FIG. 6 around the connecting shaft 12A. Thereby, the rotation to the same direction of the connection links 12 and 12 is controlled.

Next, the pair of support members 13 and 13 are formed side by side in the width direction of the support portion 4A, and are formed integrally with the support portion 4A so as to extend from the rear surface side to the rear side thereof. Here, the entire support portion 4A is formed into a curved plate shape by integral molding of synthetic resin, and the above-described pair of support members 13 and 13 and the above-described connecting shaft 12B are connected to the rear surface side thereof. Are connected to each other in the width direction so as to protrude rearward.
The rear ends of these support members 13 and 13 are connected to each other by a connecting shaft 13A extending in the width direction. Specifically, as shown in FIG. 12, the rear ends of the support members 13 and 13 are between the outer ribs 11R and 11R formed on the base 11 and the ribs 11R and 11R formed on the inner sides thereof. It is arrange | positioned in the position pinched | interposed in, and is connected with the connection shaft 13A. Here, referring back to FIG. 9, the connecting shaft 13A is arranged in a direction parallel to each of the connecting shafts 12A and 12B described above, and the long holes 11H formed in the side surface portions 11S and 11S of the base 11 are formed. , 11H. As a result, the support members 13 and 13 can be moved relative to the base 11 in the front-rear direction and the vertical direction within a range in which the connecting shaft 13A can move inside the long holes 11H and 11H. .
In addition, each rib 11R, 11R, 11R, 11R (refer FIG. 12) formed in the base 11 is formed in the shape which does not interfere with the connection shaft 13A which moves the inside of the long holes 11H, 11H.

  Next, as shown in FIG. 7, the pair of hooks 14 and 14 are made of metal, and are formed in a cam shape as a whole. Specifically, each of the hooks 14 and 14 is formed with upper jaw portions 14B and 14B and lower jaw portions 14C and 14C projecting in a claw shape at the peripheral edge thereof. These hooks 14 and 14 are arranged side by side in the width direction at a portion near the lower end of the base 11, and are connected to a connecting shaft 14 </ b> A extending in the width direction and penetrating through both side surfaces 11 </ b> S and 11 </ b> S of the base 11. They are connected together. Thus, the hooks 14 and 14 are supported so as to be pivotable with respect to the base 11. Specifically, as shown in FIG. 12, the hooks 14 and 14 are sandwiched between the left and right side surface portions 11S and 11S formed on the base 11 and the ribs 11R and 11R formed on the inside thereof. It arrange | positions at each position and is integrally connected with 14 A of connecting shafts. As a result, the hooks 14 and 14 are pivoted together as a unit. Here, the connecting shaft 14A is arranged in a direction parallel to the connecting shafts 12A and 12B and the connecting shaft 13A described above.

Here, FIG. 7 is represented as a cross-sectional view as seen from the direction of FIG. 12 cut along the line VII-VII. In FIG. 7, in order to explain the operation structure of the headrest moving mechanism 10 in an easy-to-understand manner, In the drawing, components that do not actually appear are drawn. As shown in the figure, torsion springs 14S and 14S are hung between the hooks 14 and 14 and the base 11, respectively. Each of the torsion springs 14S and 14S is provided in the form of being wound around the connecting shaft 14A. One end of the torsion springs 14S and 14S is hooked on the hooks 14 and 14, and the other end is hooked on the base 11. These torsion springs 14S and 14S are provided in a pre-twisted state, and respectively urge the hooks 14 and 14 to rotate clockwise with respect to the base 11 from the state of FIG.
Further, the hooks 14 and 14 are formed with recessed locking grooves 14D and 14D at the peripheral portions thereof. A pair of operating arms 15C and 15C of an operating member 15 described later are engaged with the locking grooves 14D and 14D. Thereby, each hook 14 and 14 is in the state where clockwise rotation by the energizing is controlled.
Here, the operating arms 15C, 15C are integrally connected to a connecting shaft 15B provided on the right end side in the drawing, and are supported so as to be pivotable with respect to the base 11. A torsion spring 15S is hung between the one operating arm 15C and the base 11. The torsion spring 15S is provided in the form of being wound around the connecting shaft 15B. One end of the torsion spring 15S is hooked on the operating arm 15C and the other end is hooked on the base 11. The torsion spring 15S is provided in a pre-twisted state, and urges both operating arms 15C and 15C to rotate counterclockwise with respect to the base 11 from the state shown in FIG. As a result, the operating arms 15C and 15C are normally held in the engaged postures that have entered the locking grooves 14D and 14D formed in the hooks 14 and 14, respectively.

The operating arms 15C and 15C are released from the engaged state with the hooks 14 and 14 by being rotated clockwise against the bias. Thereby, the hooks 14 and 14 are released from the rotation restricting state by the operation arms 15C and 15C, and rotate integrally in the clockwise direction. And after that, each hook 14 and 14 latches by contacting with other structural members, such as connecting shaft 15B.
Here, the hooks 14 and 14 are exposed to the upper jaw portions 14B and 14B in the holes of the long holes 11H and 11H as shown in FIG. 6 in a state where the rotation of the hooks 14 and 14 is restricted by the operation arms 15C and 15C. The lower end portions H0 and H0 of the long holes 11H and 11H are held in a posture state in which they are sandwiched between the upper jaw portions 14B and 14B and the lower jaw portions 14C and 14C. Then, the hooks 14 and 14 are disengaged from the operating arms 15C and 15C (see FIG. 7) and are rotated clockwise by the urging force, and as shown in FIG. 14B is moved out of the long holes 11H and 11H, and the lower jaw portions 14C and 14C are pushed up from the lower side to be exposed in the long holes 11H and 11H.

With reference to FIG. 8, the hooks 14 and 14 having the above-described configuration perform an operation of dropping the connecting shaft 13A connected to the support members 13 and 13 to the lower end portions H0 and H0 of the long holes 11H and 11H. The connecting shaft 13A can be engaged and held at the lower end portions H0 and H0.
Specifically, as described above, the hooks 14 and 14 are in a posture state in which the lower jaw portions 14C and 14C are exposed in the holes of the long holes 11H and 11H. Accordingly, in this state, by dropping the connecting shaft 13A into the lower end portions H0 and H0, the lower jaw portions 14C and 14C of the hooks 14 and 14 are pushed out of the long holes 11H and 11H in such a manner as to be pressed by this. . The hooks 14 and 14 are rotated counterclockwise by the movement of the lower jaw portions 14C and 14C, and as shown in FIG. 6, the connecting shaft 13A has the lower ends H0 and H0 of the long holes 11H and 11H. And the upper jaw portions 14B and 14B are turned upward. Then, as shown in FIG. 7, due to the counterclockwise rotation of the hooks 14, 14, the operating arms 15 </ b> C, 15 </ b> C enter the locking grooves 14 </ b> D, 14 </ b> D of the hooks 14, 14 by biasing, 14 is locked in its posture state. As a result, the connecting shaft 13A is sandwiched between the upper jaw portions 14B, 14B and the lower jaw portions 14C, 14C of the hooks 14, 14, and the connecting shaft 13A has the long holes 11H, 11H, as shown in FIG. 11H is held at the position (initial position) of the lower end portions H0 and H0.
The connecting shaft 13A is held at the positions of the lower end portions H0 and H0 described above, so that the support portion 4A is held at the initial position.

Next, as shown in FIG. 6, the operation member 15 is formed of a synthetic resin, and the connection arm 15 </ b> A disposed on the outer surface side of the right side surface portion 11 </ b> S of the base 11 illustrated in FIG. The operation arms 15C and 15C described above are integrally connected by a connecting shaft 15B. Returning to FIG. 6, the connecting arm 15A is connected to the upper end of the operation cable 50 so that the connecting arm 15A is rotated around the connecting shaft 15B by a push-pull operation in the axial direction (vertical direction). It has become.
The connecting arm 15A is always held in the posture state shown in FIG. 6 by the biasing of the torsion spring 15S described above with reference to FIG. Then, the connecting arm 15A is rotated clockwise in accordance with the movement in which the operation cable 50 is pulled downward from this state. Accordingly, returning to FIG. 7, the operating arms 15 </ b> C and 15 </ b> C also rotate together, and the rotation restricting state of the hooks 14 and 14 is released by this rotation, and the connecting shaft 13 </ b> A of the hooks 14 and 14 is released. The hold state is released.

Next, as shown in FIG. 6, the tension spring 16 includes a connecting shaft 12 </ b> A that connects the rear ends of the connecting links 12 and 12 and the base 11, and a connecting shaft that connects the rear ends of the support members 13 and 13. 13A. The tension spring 16 urges the connecting shaft 13A toward the connecting shaft 12A, and the connecting shaft 13A (see FIG. 6) held in the lower ends H0 and H0 of the long holes 11H and 11H has an upper end. It is encouraging towards H3 and H3.
Therefore, when the holding state by the hooks 14 and 14 is released by the operation of the operation member 15, the connecting shaft 13A has an upper end along the shape of the long holes 11H and 11H as shown in FIGS. It moves toward part H3, H3. With this movement, the support 4A moves relatively forward and upward from the initial position shown in FIG. 6 while the connecting links 12 and 12 are rotated.

Here, at the time of the occurrence of the above-described vehicle collision, in the process in which the support portion 4A moves forward and upward from the initial position, for example, before reaching the collision corresponding position as indicated by the phantom line in FIG. A passenger | crew's head may hit | support 4 A of support parts, and 4 A of support parts may be pushed and moved back. However, in this case, the connecting shaft 13A moving in the long holes 11H and 11H is gradually waved to the rear side (the left side in the drawing) of the long holes 11H and 11H due to the movement that is pushed to the rear side. The first stopper grooves H1 and H1 and the second stopper grooves H2 and H2 having a recessed shape are inserted. Here, in FIG. 8, the state in which the connecting shaft 13A enters the second stopper grooves H2 and H2 is indicated by a solid line.
Accordingly, the movement of the connecting shaft 13A can be restricted so as not to be pushed back to the lower end portions H0, H0 of the long holes 11H, 11H, and the support portion 4A can be prevented from being pushed back to the rear side. Accordingly, the head of the occupant can be stably received by the support portion 4A that is held at a fixed position.

Next, returning to FIG. 6, the pair of avoidance guide lever members 17 and 17 are made of synthetic resin, and the rear ends thereof are pivotally supported by the portion near the upper end of the base 11 in the width direction. Are arranged side by side. As shown in FIG. 12, the avoidance guide lever members 17 and 17 have ribs 11R and 11R formed on the outer side of the base 11 and ribs 11R and 11R formed on the inner side thereof. Are respectively connected to the connecting shafts 17A and 17A extending in the width direction and penetrating therebetween. Thereby, the avoidance guide lever members 17 and 17 are supported so as to be pivotable with respect to the base 11.
Here, returning to FIG. 6, torsion springs 17 </ b> S and 17 </ b> S are respectively hung between the avoidance guide lever members 17 and 17 and the base 11. These torsion springs 17S and 17S are provided in the form of being wound around the connecting shafts 17A and 17A, respectively. One end of the torsion springs 17S and 17S is hooked on the avoidance guide lever members 17 and 17, and the other end is hooked on the base 11. I'm wearing it. Thereby, the torsion springs 17S and 17S hold the avoidance guide lever members 17 and 17 in the posture state of FIG. 6 in their free state. That is, the front end portions of the avoidance guide lever members 17 and 17 are held in a posture state where they are exposed in the long holes 11H and 11H. Here, the avoidance guide lever members 17 and 17 are formed with spoon-shaped receiving portions 17B and 17B at the front end portions thereof. The avoidance guide lever members 17 and 17 are normally held in a posture in which the spoon-shaped receiving portions 17B and 17B are exposed in the holes 11H and 11H, respectively.

These avoidance guide lever members 17 and 17 move upward in the long holes 11H and 11H when the support portion 4A moves in the advancing direction from the initial position shown in FIG. 6 to the collision corresponding position shown in FIG. It is designed to be pushed away from the bottom by being pushed up from below by the connecting shaft 13A. Specifically, as shown in FIG. 8, the avoidance guide lever members 17 and 17 are once pushed counterclockwise by the connecting shaft 13A that moves upward. As shown in FIG. 9, when the connecting shaft 13A reaches the upper end portions H3 and H3 of the long holes 11H and 11H, the avoidance guide lever members 17 and 17 are separated from the contact with the connecting shaft 13A. Due to the force, the posture is returned to the state before being pushed.
However, as shown in FIG. 10, the avoidance guide lever members 17 and 17 are connected shafts that move downward in the long holes 11H and 11H when the support portion 4A is returned to the initial position from the above-mentioned collision-corresponding position. 13A is received by spoon-shaped receiving portions 17B and 17B formed at the front end portion thereof. Then, by further moving the support portion 4A toward the initial position in this receiving state, the avoidance guide lever members 17 and 17 are rotated in the clockwise direction in the paper in such a manner as to guide them while being pushed by the connecting shaft 13A. To turn. As shown in FIG. 11, the avoidance guide lever members 17 and 17 move and guide the connecting shaft 13A to the vicinity of the lower end portions H0 and H0 of the long holes 11H and 11H, and then come into contact with the connecting shaft 13A. Come off. That is, in the avoidance guide lever members 17 and 17, the connecting shaft 13A enters the first stopper grooves H1 and H1 and the second stopper grooves H2 and H2 of the long holes 11H and 11H during the operation of returning the support portion 4A to the initial position. This is guided so as not to move, and assists so that the support portion 4A can be smoothly returned to the initial position.

Next, the usage method of a present Example is demonstrated.
That is, referring to FIG. 1, the headrest 4 is configured to be detachable from the seat back 2, and the stays 4 </ b> B and 4 </ b> B under the headrest 4 are respectively inserted into the insertion ports Sa and Sa of the supports 2 </ b> S and 2 </ b> S. By being inserted, it is mounted on the upper part of the seat back 2. In the mounted state of the headrest 4, the engagement state between the slide member 41 of the traction operation mechanism 40 and the operation cable 50 inserted into the stay 4 </ b> B is a state where the separation is released (blocked). Therefore, in this state, it is possible to freely move the stays 4B and 4B with respect to the supports 2S and 2S, and to freely attach and remove the headrest 4 to and from the seat back 2. be able to.
The seat 1 assembled as described above always holds the support portion 4A of the headrest 4 in the posture state at the initial position before the vehicle collision occurs. And if the rear surface collision of a vehicle generate | occur | produces and the backrest load which a passenger | crew's back part presses against the seat back 2 is applied, the pushing member 20 will be pushed back. As a result, as shown in FIG. 5, the slide member 41 of the traction operation mechanism 40 is pulled downward, and the operation cable 50 is engaged with it and pulled downward. As a result, the holding state of the support portion 4A shown in FIG. 6 is released, and the support portion 4A moves from the initial position state of FIG. 6 to the collision corresponding position shown in FIG. Therefore, the occupant's head that tilts backward due to the momentum of the vehicle collision can be received from the rear side by the support portion 4A that has moved to the position corresponding to the collision.

Thus, according to the vehicle seat of the present embodiment, the operation cable 50 provided on the headrest 4 side and the traction operation mechanism 40 on the seat back 2 side that performs traction operation between the operation cable 50 and the traction operation mechanism 40 before the vehicle rearward collision occurs. The operation cable 50 can be releasably connected so as to be able to cope with the movement of attaching / detaching the headrest 4 to / from the seat back 2 by a simple configuration in which the engagement state between the two is separated and released at normal times. .
Further, the height position of the headrest 4 is adjusted by setting a plurality of protrusions 50A on the operation cable 50 so that the protrusions 50A can be engaged with the slide member 41 even if the amount of insertion of the stay 4B is changed. However, it is possible to perform the pulling operation of the operation cable 50 at the time of the rear collision of the vehicle. Furthermore, since the plurality of protrusions 50A are set with a close interval, the amount of operation movement required for the slide member 41 can be reduced, so that the operability of the operation cable 50 can be improved. Furthermore, the operability of the operation cable 50 can be further improved by adopting a configuration in which the operation cable 50 is engaged so as to be sandwiched from both sides by the slide member 41 formed as a V-shaped clamping member.

Next, the vehicle seat of the second embodiment will be described with reference to FIG.
In the vehicle seat of the present embodiment, a connection cable 42 that pulls the slide member 41 of the pulling operation mechanism 40 shown in the first embodiment connects the first connection link 43A and the second connection link 43B. The structure is replaced by a mechanism. Here, the first connecting link 43A and the second connecting link 43B constituting the link mechanism correspond to the connecting member of the present invention.
Specifically, the lower end of the first connecting link 43A is pivotally supported by an operating arm 32A formed on the case 32 of the damper 30, and the upper end is hooked on the central portion of the second link 43B. Yes. Further, the second connection link 43B is pivotally supported at one end on the left side in the drawing so as to be rotatable on the side frame Fs, and the other end on the right side in the drawing is hooked on the V-shaped slide member 41. . Thereby, the motive power by which the pushing member 20 is pushed rearward can be transmitted as an operating force for pulling the slide member 41 downward by the first connecting link 43A and the second connecting link 43B.
As described above, the connecting member that transmits the movement of the pushing member 20 at the time of the rear collision of the vehicle to the slide member 41 can be easily configured by a link mechanism in which two link members are combined.

Although the embodiment of the present invention has been described with reference to two examples, the present invention can be implemented in various forms in addition to the above-described example.
For example, as shown in FIG. 14, the protrusion 50 </ b> B may be formed by forming irregularities on the peripheral surface of the operation cable 50. It should be noted that the protrusions 50B shown in the figure are formed so as to be further spaced from the protrusions 50A shown in the above embodiments. Thereby, it is possible to further reduce the distance required to engage with any of the protrusions when the slide member slides in the insertion direction.
In addition, although the configuration in which the slide member of the traction operation mechanism is engaged with the protrusion in the form of sandwiching both sides of the operation cable is shown, a configuration in which the slide member is engaged only on one side may be employed. In addition, the configuration in which the slide member and the operation cable are brought into contact with each other in the insertion direction and engaged is shown, but both may be detachably engaged by using a hooking means such as a hook.
Moreover, although the operation cable inserted through the stay is shown as the second transmission mechanism installed on the headrest side, it is not limited to such a cable type, and other transmission structures such as a link structure are used. You can also. Similarly, the first transmission mechanism provided on the seat back side is not limited to the connection cable 42 (Example 1) or the connection link (Example 2) shown in the above embodiment, but other transmissions. A structure can also be used.

3 is a perspective view illustrating a schematic configuration of a sheet according to Embodiment 1. FIG. It is the disassembled perspective view which expanded and represented the insertion structure to the support of a stay. It is the perspective view which expanded and represented the mechanism which carries out pulling operation of the lower end of a connection cable. FIG. 6 is a partially enlarged perspective view showing a state before the operation cable is pulled. It is a partial expansion perspective view showing the state where the operation cable was pulled. It is a side view showing the initial state of the headrest moving mechanism. It is a block diagram showing the structure which hold | maintains a headrest moving mechanism in an initial state. It is a side view showing the state in the middle of the movement to the advancing direction of a headrest moving mechanism. It is a side view showing the state where the headrest moving mechanism has finished moving in the traveling direction. FIG. 10 is a configuration diagram showing an intermediate state of an operation for returning the headrest moving mechanism to the initial state from the state of FIG. 9. FIG. 11 is a configuration diagram illustrating a state in which the headrest moving mechanism is returned to the initial state while being guided from the state of FIG. 10. It is the block diagram which looked at the headrest moving mechanism from the Y line direction of FIG. 6 is a partially enlarged perspective view illustrating a configuration of a seat pulling operation mechanism according to Embodiment 2. FIG. It is the partial expansion perspective view showing the modification example of the operation cable.

Explanation of symbols

1 seat 2 seat back 2F back frame Fu upper frame Fs side frame Ft reinforcement plate 2S support Sa insertion slot Sb knob 2W mounting wire 2B mounting bracket Bt outer fixed piece Bx stopper 2C mounting bracket 3 seat cushion 4 headrest 4A support 4B stay Bw opening Bb bush 10 headrest moving mechanism 11 base 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 12 connection link 12A connection Axis 12B Connection shaft 13 Support member 13A Connection shaft 14 Hook 14A Connection shaft 14B Upper jaw portion 14C Lower jaw portion 14D Locking groove 14S Torsion spring 15 Operation member 15A Connection arm 15B Connection shaft 1 C operating arm 15S torsion spring 16 tension spring 17 avoidance guide lever member 17A connecting shaft 17B receiving portion 17S torsion spring 20 pushing member 20S torsion spring 21 receiving arm 30 damper 31 rotating shaft 31A connecting arm 32 case 32A operating arm 40 towing Operation mechanism 41 Slide member 41A Engagement plate 42 Connection cable (connection member)
42A Inner member AF hook 42B Outer member T Mounting frame W Bushing 43A First connection link (connection member)
43B Second connection link (connection member)
50 Operation cable 50A Protrusion 50B Protrusion

Claims (4)

A vehicle seat that detects a change in behavior of an occupant seated on a seat at the time of a rear collision of the vehicle and moves a support portion of a headrest that receives the occupant's head relative to the head,
A detection device at the time of a vehicle rear impact that detects a change in the behavior of an occupant seated on a seat at the time of a vehicle rear impact as a mechanical operation movement amount;
A headrest capable of moving the mechanical operation movement detected by the detection device at the time of rearward collision of the vehicle via a mechanical transmission mechanism and relatively moving the support portion of the headrest closer to the head. A moving mechanism,
The mechanical transmission mechanism is composed of a first transmission mechanism equipped on the seat back side and a second transmission mechanism equipped on the headrest side,
Between the first transmission mechanism and the second transmission mechanism, there is provided connecting means capable of bringing the two transmission mechanisms into a transmission state or a separation state. It is configured to operate according to the amount of mechanical operation movement from the detection device at the time, and is normally in a disconnected state in which the two transmission mechanisms are separated, but both transmissions are detected when a vehicle rear-end collision is detected. It is in a connected state that transmits between the mechanisms ,
The second transmission mechanism has a cylindrical shape in which a transmission mechanism member on one end side thereof is connected to a headrest moving mechanism disposed inside the headrest, and the transmission mechanism member on the other end side serves as a column of the headrest. The stay is inserted into the stay, and is operated together with the stay along with the insertion / removal operation of the stay into the upper part of the seat back.
The first transmission mechanism corresponds to a transmission mechanism member on the other end side of the second transmission mechanism as a traction operation based on a mechanical operation movement amount at the time of a vehicle rear collision detected by a detection device at the time of vehicle rear collision. Is transmitted to the transmission member arranged
The connecting means is provided between the transmission mechanism member on the other end side of the second transmission mechanism and the transmission member of the first transmission mechanism, and in the transmission state between the two transmission mechanisms by the connecting means. The second transmission mechanism is configured to be pulled by the first transmission mechanism,
The vehicle rear collision detection device is a pushing member that is pushed and moved in accordance with a behavior change at the time of vehicle rear collision of an occupant seated on a seat provided on the seat back.
The first transmission mechanism is connected to the push member, and is linked to the movement of the push member and is inserted into the seat back together with the stay as a transmission mechanism member on the other end side of the second transmission mechanism. It is configured as a towing operation mechanism that pulls to operate the operation cable,
The traction operation mechanism is
A slide member as the transmission member provided in the seat back and slidably movable in a direction of inserting and removing the stay of the headrest;
A connecting member provided to connect the slide member and the push member, and transmitting the movement of the push member at the time of rearward collision of the vehicle to slide the slide member in the stay insertion direction. ,
An opening is formed through the peripheral wall of the stay along the longitudinal direction thereof, and an operation cable inserted into the stay from the inside of the opening is exposed.
The connecting means is formed to project on the peripheral surface of the operation cable by inserting the slide member into the opening of the stay as the slide member slides in the insertion direction in conjunction with the movement of the push member. It is configured as an engaging structure for engaging with the projection portion, a vehicle seat, characterized in Rukoto to pulling operation of the operation cable with the motion to pull the protrusion portion in the insertion direction. The vehicle seat according to claim 1,
A plurality of protrusions formed on the peripheral surface of the operation cable are set along the longitudinal direction of the operation cable, and the plurality of protrusions are exposed from an opening formed on the peripheral wall of the stay; And
Even if the amount of insertion of the stay with respect to the seat back is changed, the slide member can enter the opening as it moves in the insertion direction and engage with any of the protrusions. A vehicle seat. The vehicle seat according to claim 2,
The plurality of protrusions formed on the peripheral surface of the operation cable are spaced apart from each other in order to reduce the distance required to engage with any of the protrusions when the slide member slides in the insertion direction. vehicle seat, characterized that you have been set stuffed. The vehicle seat according to any one of claims 1 to 3,
The sliding member of the traction operation mechanism has a shape folded back in a V shape so as to be able to perform a clamping operation, and is elastically moved by moving the inside of the mounting frame provided on the seat back in a sliding direction. It is a mounting structure that can be squeezed or restored and expanded,
Both end portions of the slide member that are folded back in a V-shape are formed with plate-like engagement plates that are inwardly facing each other as the connecting means, and the slide member slides in the insertion direction. The projecting portion formed in a pedestal shape in such a manner that the engaging plates formed at both tip side portions enter into the opening formed in the stay and sandwich the operation cable inserted in the inside with movement. The vehicle seat is configured to engage in the insertion direction .

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