JP2008037307A - Vehicle seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To install a mechanism for operating a cable member while saving a space. <P>SOLUTION: This vehicle seat has a movement mechanism for a headrest. The vehicle seat is further provided with a formed wire 20, an operation mechanism 50 for transmitting the movement of the formed wire 20 to the movement mechanism and the cable member 40. When a collision occurs, the formed wire 20 receives a backrest load of an occupant and is pressed backwardly. The operation mechanism 50 has a movable member 51 mounted to the formed wire 20, a fixed member 52 fixed to a back frame and first and second links 53, 54 arranged between the moveable member 51 and the fixed member 52 in a crossed state. A crossing angle between the first and second links 53, 54 is increased and decreased by the movement to approach and separate the movable member 51 to and from the fixed member 52. At the lower end of the cable member 40, the end of an outer member 41 is connected to a first slider 55 mounted to the first link 53, and the end of an inner member 42 is connected to a second slider 56 mounted to the second link 54. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

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

2. Description of the Related Art Conventionally, some seats for automobile seats employ an active headrest that can support a passenger's head by instantaneously moving the headrest forward when a rear-end collision of the vehicle occurs. For example, Patent Document 1 below discloses a vehicle seat that is configured such that a headrest is operated by a cable member that is arranged to be pulled when a rear-end collision of the vehicle occurs. In this disclosed technique, the end portion on the operation side where the cable member is pulled is routed inside the seat back. The cable member is pulled by receiving a backrest load applied to the back of the occupant against the seat back when a rear collision of the vehicle occurs.
Specifically, the cable member has a double structure in which a linear inner member is inserted into a tubular outer member. In this cable member, the end portion on the operation side of the outer member is integrally fixed to the frame portion of the seat back, and the end portion on the operation side of the inner member is connected to the operation mechanism including the link mechanism. . Here, the operating mechanism is configured in a form in which two link members are connected in a straight line, and the arm can be bent and extended. This operation mechanism is always held in a posture in which the arm is bent, and is pushed and moved in such a manner that the arm is extended by receiving the backrest load from the occupant described above. As a result, the end of the inner member connected to the tip of the arm of the operation mechanism is pulled and pulled out from the outer member.
JP 2006-56358 A

  However, in the above-described conventional technology, a space for extending the arm of the operation mechanism from the bent state is necessary to perform the pulling operation of the cable member. Such a structure disposed inside the seat back is also preferably provided with a space saving as much as possible because other structures such as a lumbar support and an air conditioner are also disposed.

  The present invention was devised as a solution to the above-described problems, and the problem to be solved by the present invention is that a cable member operating mechanism for operating the headrest in the event of a vehicle collision can be installed in a small space. There is in doing so.

In order to solve the above problems, the vehicle seat of the present invention takes the following means.
A first aspect of the present invention is a vehicle seat including a headrest moving mechanism that can move a support portion of a headrest that receives a head of an occupant seated on a seat relative to a seatback when the vehicle collides. A pressing member disposed inside the shape of the seat back; and a transmission mechanism that transmits the movement of the pressing member to the headrest moving mechanism. The pushing member is disposed so as to be pushed and moved rearward under a backrest load applied to the occupant's back against the seat back when a vehicle collision occurs. The transmission mechanism includes a cable member connected at one end to the headrest moving mechanism, and an operation mechanism connected to the other end of the cable member to pull the other end of the cable member in response to the movement of the push member at the time of a vehicle collision. And having. The cable member has a double structure in which the linear inner member is inserted into the tubular outer member so as to be relatively movable in the axial direction, and the inner member at the other end is pulled out from the outer member. As a result, the headrest moving mechanism is actuated to move the support portion from the normal initial position toward the collision-responsive position. The operating mechanism is arranged integrally with the push member or a movable member pushed backward in relation to the movement of the push member, and integrally with the seat back at a rear side position where the movable member is pushed and moved. And the two link members arranged so as to be in a posture in which the fixed member and the movable member cross each other. The two link members are connected to at least one of the movable member and the fixed member so as to be slidable in a direction in which the distance between the end portions is widened or narrowed. Are connected so as to make the crossing angle larger or smaller by moving them relatively close to each other. In the connection structure between the other end of the cable member and the operation mechanism, the end of the outer member is connected to one link member of the operation mechanism, and the end of the inner member is connected to the other link member of the operation mechanism. Yes. The end of the inner member and the outer member are moved by the movement of the two link members of the operation mechanism sliding in the direction of increasing the crossing angle of each other when the push member is pushed rearward. It is towed in such a way that the ends of the are separated from each other.
According to the first aspect of the present invention, the two link members constituting the operation mechanism are arranged so as to intersect with each other. Therefore, the movement width of the sliding movement is suppressed to be small due to the overlap of the link lengths. The two link members are pulled by moving the movable member rearward so that the end of the outer member and the end of the inner member constituting the other end of the cable member are separated from each other. Therefore, the movement width of each link member in the slide movement direction can be kept small.

Further, according to a second aspect, in the first aspect described above, the slide movement direction in which the two link members of the operation mechanism increase or decrease the crossing angle with each other is the width direction of the seat back.
According to the second aspect of the invention, the two link members widen and narrow the distance between the end portions with respect to the width direction of the seat back. Thereby, the other end of the cable member is pulled in the width direction of the seat back.

Next, according to a third aspect, in the first or second aspect described above, the two link members of the operation mechanism are formed by appropriately bending a linear wire member.
According to the third aspect of the present invention, the two link members are formed by linear wire members, and compared with the case where the two link members are formed by plate-like members, the sliding motion is performed in a state where they are crossed with each other. It becomes easy to form. Further, the pivot for pivotally attaching each link member to the movable member or the fixed member can be easily formed by bending the link member itself.

Next, according to a fourth aspect of the present invention, in any one of the first to third aspects described above, the pushing member is formed by appropriately bending a linear wire member, and an end portion of the pushing member is a seat back. As a connected state, it is elastically held at an initial position that receives a backrest load from the occupant. The movable member of the operation mechanism is attached to a horizontally long portion that extends in the width direction of the seat back in the pushing member formed as a linear wire member. The slide movement direction that increases or decreases the crossing angle between the two link members is the width direction of the seat back.
According to the fourth aspect of the present invention, the pushing member is formed of a linear wire member, thereby providing a space-saving configuration in which the linear member swings backward. On the other hand, the operation mechanism has a lateral arrangement that widens and narrows the distance between the end portions with respect to the width direction of the seat back. In the laterally arranged operation mechanism, the movable member is attached to a horizontally long portion extending in the width direction of the seat back of the linear pushing member, and the horizontally long portion swings backward in the wide range of the movable member. Receive a moving movement.

Next, according to a fifth aspect of the present invention, in any one of the first to fourth aspects, the two link members of the operating mechanism are formed to have the same link length, and the other end of the cable member is disposed. While maintaining the orientation, slide and move in a direction that increases the crossing angle of each other.
According to the fifth aspect of the present invention, the cable member is pulled in the axial direction without changing the arrangement direction by the two link members formed to have the same link length. As a result, the cable member can be pulled straight in the axial direction.

Next, according to a sixth aspect of the present invention, in any one of the first to fifth aspects described above, the two link members of the operation mechanism are pivotally attached to the movable member so that the respective end portions thereof are pivotable. Each end portion of the fixing member is pivotally attached so as to be pivotable and slidable.
According to the sixth aspect of the present invention, the two link members are connected to each other while the movable member is pushed and moved rearward, while sliding the end portions pivotally attached to the respective fixed members. Increase the crossing angle between different parts.

The present invention can obtain the following effects by taking the above-described means.
First, according to the first invention, the link members of the operation mechanism for pulling the other end of the cable member are arranged in an intersecting manner, so that the link lengths of the link members can be overlapped and the slide movements can be performed. The movement width in the direction can also be kept small. Therefore, the operation mechanism can be installed in a space-saving manner.
Furthermore, according to the second invention, the sliding movement direction of each link member is set to the width direction of the seat back, so that with other structures such as lumbar support and air conditioning installed at the upper and lower positions thereof The operation mechanism can be installed in a space-saving manner in the height direction so as to avoid interference.
Further, according to the third invention, the two link members are formed by the linear wire members, so that they can be slid in a state of crossing each other, and the pivots for the movable members and the fixed members are formed. Can be easily performed. And since a separate pivot is unnecessary, the number of parts can be reduced.
Furthermore, according to the fourth aspect of the present invention, the movable member of the operation mechanism arranged in the lateral direction is attached to the horizontally long portion of the linearly formed pusher member, so that the entire configuration is further saved in space. can do.
Furthermore, according to the fifth aspect, since the pulling operation of the cable member can be performed straight in the axial length direction, such an operation can be performed smoothly.
Furthermore, according to the sixth aspect of the invention, the cable member can be disposed at a position close to the fixing member, and the amount of movement of the cable member in the front-rear direction at the time of towing operation can be suppressed to be small. Space can be made more compact.

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

First, the vehicle seat according to the first embodiment will be described with reference to FIGS.
Here, in FIG. 1, the internal framework structure of the seat back 2 is represented by a perspective view. The vehicle seat of the present embodiment has a configuration in which a part of a headrest 3 that receives the head of an occupant seated on the seat 1 can be moved relative to the seat back 2 when the vehicle collides. Here, the headrest 3 is installed in the upper part of the seat back 2, and is normally in a state in which the installed posture state is maintained and the head of the occupant can be supported from the rear side. . However, as shown in FIG. 4, the headrest 3 is configured so that the front-side support portion 3 a that receives the head of the occupant can be instantaneously moved forward when a rear collision of the vehicle occurs. That is, when the above-mentioned collision occurs, the support portion 3a of the headrest 3 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 3. . As a result, when the above-described collision occurs, the head can be supported so as not to tilt backward due to the momentum of the collision, and the load on the neck can be reduced.

Here, the forward movement of the support portion 3 a described above is performed by the operation of the headrest moving mechanism 10 incorporated in the headrest 3. The headrest moving mechanism 10 is provided between the support portion 3 a and the stays 3 b and 3 b that serve as support columns of the headrest 3. This headrest moving mechanism 10 is configured by a four-bar linkage mechanism, and is normally held in the posture state indicated by the phantom line in FIG. 4 to hold the support portion 3a in the initial position. . When the rear collision of the vehicle occurs, the headrest moving mechanism 10 is released from the above holding state and operates in a direction in which the support portion 3a is moved forward by an urging force (advancing direction indicated by an arrow). . Thereby, the headrest moving mechanism 10 moves the support portion 3a relatively forward and upward from the normal initial position state (virtual line state) with respect to the stays 3b and 3b, as indicated by the solid line in FIG. The operation of the headrest moving mechanism 10 in the traveling direction is regulated at a collision-corresponding position (solid line position) in which the support portion 3a is moved close to the back of the head as shown by the solid line in FIG. It has become. Here, the initial posture state of the headrest moving mechanism 10 is shown in a perspective view in FIG. Further, the posture state after the operation of the headrest moving mechanism 10 is shown in a perspective view in FIG.
Returning to FIG. 1, the operation of releasing the holding state of the headrest moving mechanism 10 is performed in accordance with the pulling operation of the cable member 40 routed inside the seat back 2. Here, the upper end of the cable member 40 is routed inside the headrest 3 and connected to the headrest moving mechanism 10, and the lower end is routed inside the seat back 2 and disposed at the lower position thereof. Connected to the operating mechanism 50. The operation mechanism 50 pulls the lower end of the cable member 40 by receiving a backrest load applied to the occupant's back against the seat back 2 when a vehicle collision occurs. Thereby, the headrest moving mechanism 10 is released, and the support portion 3a is transferred from the normal initial position toward the collision corresponding position.

Hereinafter, each configuration of the headrest moving mechanism 10 and the operation mechanism 50 will be described in detail.
First, the headrest moving mechanism 10 will be described. That is, as shown in FIG. 6, the headrest moving mechanism 10 is configured by a pair of left and right four-bar linkage mechanisms including movable links 11 and 11, fixed links 12 and 12, driving links 13 and 13, and driven links 14 and 14. Has been. In this pair of left and right four-joint link mechanisms, the left and right movements are synchronized by long connecting shafts 10a to 10d connecting the nodes of the links.
Here, the movable links 11 are fixed integrally with the support portion 3a (see FIG. 4). The movable links 11 and 11 have their upper end portions linked to the front end portions of the driven links 14 and 14 by a connecting shaft 10b. And the lower end part of the movable links 11 and 11 is link-connected with the front-end part of the drive links 13 and 13 by the connection shaft 10c, respectively.
The fixed links 12 and 12 are configured by support brackets 3c and 3c fixed integrally to the stays 3b and 3b. Specifically, the support brackets 3c and 3c are formed with arm-shaped upper arm support portions Au and Au and lower arm support portions Al and Al protruding rearward at the upper end portion and the middle portion thereof. The upper arm support portions Au and Au are linked to the rear end portions of the driven links 14 and 14 by the connecting shaft 10a. The lower arm support portions Al and Al are linked to the rear end portions of the driving links 13 and 13 by the connecting shaft 10d.

  Here, the stays 3b and 3b, which are the support columns of the headrest 3 described above, are formed in a bent shape in which the upper part from the middle thereof is inclined forward in the shape of "<". Returning to FIG. 1, these stays 3 b and 3 b are respectively inserted and fixed to supports 2 s and 2 s fixed to the upper frame Fu of the back frame 2 f that forms the skeleton of the seat back 2. As a result, the headrest 3 is held in a state of being installed on the upper portion of the seat back 2. Returning to FIG. 6, the support brackets 3 c and 3 c are formed in the cross-section “U” sign shape, and the upper end portions of the stays 3 b and 3 b in the forward inclined posture are arranged inside the “U” shape. It is fixed integrally with these by welding. The support brackets 3 c and 3 c are respectively fixed to the stays 3 b and 3 b with the “U” -shaped opening facing the rear of the headrest 3. As a result, the groove of the “U” is placed in a state where it does not face the passenger's head.

In the headrest moving mechanism 10, two tension springs Sa are hung between the connecting shaft 10a and the connecting shaft 10c. These tension springs Sa and Sa urge the headrest moving mechanism 10 in the operation direction of travel. Here, the operating direction of the headrest moving mechanism 10 is the direction in which the driving links 13 and 13 rotate clockwise about the connecting shaft 10d as seen in FIG.
Further, the driving links 13 and 13 are integrally formed with an engaging arm portion 15 having a shape in which an arm extends further rearward from a connection portion (connecting shaft 10d) with the fixed links 12 and 12. The engaging arm portion 15 is formed on each of the driving links 13 and is configured as a pair of left and right, but is connected to each other and has an integral shape. Further, as shown in FIG. 5, a shaft support member Gb is disposed between the lower arm support portions Al and Al described above so as to connect them. As shown in FIG. 7, the shaft support member Gb is disposed at a position separated from the rear side of the connecting shaft 10d, and is supported so as to be pivotable with respect to the lower arm support portions Al and Al. . Cam-shaped holding members Fb and Fb are integrally fixed to both ends of the shaft support member Gb. Here, as shown in FIG. 6, a tension spring Sb is hung between the holding member Fb on the left side in the drawing and the support bracket 3c on the left side. The tension spring Sb urges the holding members Fb and Fb, which are integrated with each other, in the clockwise direction in FIG. Thereby, each holding member Fb, Fb is hold | maintained in the attitude | position state which can be engaged with the engagement arm part 15 mentioned above.

Here, referring to FIG. 7, the engagement arm portion 15 includes a locking surface 15 a that can contact the cam-shaped holding members Fb and Fb and a contact surface 15 b that can contact the shaft support member Gb. And are formed.
The former locking surface 15 a is formed with its surface facing in the clockwise rotation direction of the engaging arm portion 15. When the holding members Fb and Fb are in a posture state indicated by a solid line, the locking surface 15a engages in a manner that it is abutted against the locking surface 15a. That is, since the holding members Fb, Fb and the engaging arm portion 15 are pivotally supported by the connecting shaft 10d or the pivotal support member Gb which are in an eccentric positional relationship, The parts in contact with each other are held in a state of biting into each other. As a result, the rotation of the headrest moving mechanism 10 in the traveling direction is restricted via the engaging arm portion 15 engaged with the holding members Fb and Fb.
Further, the latter contact surface 15b is formed in a concavely curved shape so as to receive the shaft support member Gb. Here, the engagement state between the holding members Fb and Fb and the locking surface 15a is released by rotating the holding members Fb and Fb counterclockwise by a pulling operation of the cable member 40 described later. Thereby, the engagement arm portion 15 is released from the rotation restricted state by the holding members Fb and Fb, and is rotated in the traveling direction by the urging of the tension springs Sa and Sa. As a result of this rotation, as indicated by the phantom line in the figure, the contact surface 15b is now in contact with the shaft support member Gb, and the operation of the headrest moving mechanism 10 in the traveling direction is restricted again. It becomes.

Here, as shown by the solid line in FIG. 4, the headrest moving mechanism 10 is controlled in the moving direction (arrow direction) by the contact between the shaft support member Gb and the engagement arm portion 15, that is, the support. In a state in which the part 3a has moved to the position corresponding to the collision, the posture state of the headrest moving mechanism 10 is as follows. That is, the driving links 13 and 13 and the driven links 14 and 14 are in a posture state in which they are directed upward from the horizontal with respect to the connecting shaft 10d or the connecting shaft 10a with respect to the fixed links 12 and 12, respectively. Thereby, the movable links 11 and 11 push the receiving load for receiving the head of the occupant by the support portion 3a to rotate the headrest moving mechanism 10 in the traveling direction regulated by the contact with the shaft support member Gb. It is in a posture state that acts as pressure.
Therefore, when a rear-end collision of the vehicle occurs, even if a receiving load that catches the occupant's head accompanying the rearward tilt acts on the support portion 3a, the support portion 3a is in a direction opposite to the traveling direction (the direction opposite to the arrow) It is held in a state where it is not pushed back to.

Here, the framework structure of the back frame 2f constituting the skeleton of the seat back 2 will be described with reference to FIG. That is, the back frame 2f is formed in a gate-shaped frame shape by rigidly coupling the upper frame Fu and the side frames Fs and Fs. An upper reinforcing plate 2u, a lower reinforcing plate 2t, and a reinforcing member 2r are rigidly coupled integrally with the back frame 2f. The upper reinforcing plate 2u, the lower reinforcing plate 2t, and the reinforcing member 2r are respectively bridged between the side frames Fs and Fs, and are welded to and fixed integrally.
Specifically, the upper reinforcing plate 2u is fixed immediately below the upper frame Fu, with the plate surface facing forward.
The lower reinforcing plate 2t is fixed at a rear position on the lower end side of both side frames Fs, Fs with the plate surface facing forward.
The reinforcing member 2r is formed in a curved plate shape, and is also fixed integrally with the lower reinforcing plate 2t at a position in front of the lower reinforcing plate 2t with the curved plate facing upward (FIG. 8). reference). Returning to FIG. 1, the reinforcing member 2r is disposed so as to cover the periphery of the operating shaft 4a disposed between the side frames Fs and Fs in the width direction from the front side and the lower side. Has been. Here, the operation shaft 4a is a member that transmits the operation force so that the operation state of the lock / unlock operation of the reclining mechanisms 4, 4 provided on both sides in the width direction of the seat back 2 can be switched simultaneously on the left and right. It is. As shown in FIG. 8, the operation shaft 4 a is provided at a position spaced downward from a load acting portion (for example, a portion indicated by P in the figure) of the backrest load of the occupant in the seat back 2. ing. Therefore, since the operation shaft 4a is not easily affected by the backrest load, it is difficult to bend and deform when a rear collision of the vehicle occurs. Similarly, the reinforcing member 2r disposed on the lower side of the operation shaft 4a is hardly affected by the backrest load. The reinforcing member 2r protects the operation shaft 4a from interference with an assembly member (not shown) such as a back pad that is assembled to the back frame 2f.

Next, the cable member 40 will be described. That is, as shown in FIG. 1, the cable member 40 has a double structure in which a linear inner member 42 is inserted into a tubular outer member 41 so as to be relatively movable in the axial direction.
As shown in FIG. 7, the upper end of the cable member 40 is routed inside the headrest 3 and connected to the headrest moving mechanism 10. Specifically, the end on the upper end side of the inner member 42 is connected to the left holding member Fb shown in the drawing. The outer member 41 is integrally fixed to a stay 3b and a support bracket 3c provided on the left side of the headrest 3. In addition, since the outer member 41 is for guiding the path of the inner member 42 with respect to the stay 3b, it can be made unnecessary by using the stay 3b formed in a cylindrical shape. it can.
Moreover, the lower end of the cable member 40 is connected to the operation mechanism 50 mentioned later, as FIG. 2 shows. As shown in FIG. 1, the operation mechanism 50 is pushed and moved by a later-described formed wire 20 when a vehicle collision occurs, so that the end on the lower end side of the inner member 42 is moved to the lower end side of the outer member 41. It is configured to be pulled by pulling it away from the end. Therefore, as shown in FIG. 7, when the end portion on the lower end side of the inner member 42 is pulled, the holding members Fb and Fb are rotated counterclockwise against the bias of the tension spring Sb. Then, the holding state of the headrest moving mechanism 10 is released. Note that the holding members Fb and Fb are in a posture state before the pulling operation at the lower end side of the inner member 42 is released, and the holding members Fb and Fb are rotated clockwise by the biasing force of the tension spring Sb before being pulled. Returned to Therefore, the holding members Fb and Fb are automatically engaged with the locking surface 15a of the engaging arm portion 15 by performing an operation of returning the headrest moving mechanism 10 rotated in the traveling direction to the initial position. Can do.
By the way, returning to FIG. 1, the outer member 41 described above is divided into an inside of the headrest 3 and an inside of the seat back 2. Specifically, the outer member 41 arranged inside the headrest 3 is integrally fixed to the stay 3b and the support bracket 3c provided on the left side of the headrest 3, as described above. Further, the outer member 41 routed inside the seat back 2 is connected to the operation mechanism 50 at the lower end. And the edge part of the upper end side of this outer member 41 is being integrally fixed to the attachment board part T formed in the shape projected from the upper reinforcement board 2u of the seat back 2 to the front side. Specifically, the end of the outer member 41 on the upper end side is positioned by fitting the constricted portion formed at the end into the mounting port Mu formed in the mounting plate T and sliding it to the inside. It is fixed.

Here, as shown in FIG. 1, a damper 60 is attached to the front surface of the upper reinforcing plate 2u. The damper 60 is provided so as to be interposed in the middle of the path of the inner member 42 protruding from the upper end side of the outer member 41. Here, FIG. 10 shows the internal structure of the damper 60.
As shown in the figure, the damper 60 includes a cylindrical portion 61 filled with silicon oil (viscous material) therein, and a shaft portion 62 assembled so as to be slidable in the vertical direction with respect to the cylindrical portion 61. Have. An inner member 42 coming from the upper side is connected to the upper surface portion of the former cylindrical portion 61. Further, an inner member 42 coming from the lower side is connected to the lower part of the latter shaft portion 62. In this damper 60, the internal space of the cylinder portion 61 is vertically divided by a partition plate 62a formed on the upper end side of the shaft portion 62, and silicon oil is transferred to the partition plate 62a as the shaft portion 62 moves up and down. It circulates through the formed circulation hole 62b. That is, relative movement of the shaft portion 62 relative to the tubular portion 61 is allowed by the movement of the silicone oil flowing through the flow hole 62b. The partition plate 62a is normally urged and held at an upper position indicated by a solid line by a compression spring 64 provided between the partition plate 62a and the cylinder portion 61.
The partition plate 62a is provided with an on-off valve 63 that can open and close the lower opening of the flow hole 62b. The on-off valve 63 is normally held in a state where the lower opening of the flow hole 62b is released. When the lower inner member 42 is pulled downward at a high speed, the on-off valve 63 is pressed by the viscous resistance of silicon oil that tends to flow upward through the flow hole 62b, and the flow hole The opening 62b is closed from below. As a result, the downward movement of the shaft portion 62 relative to the cylindrical portion 61 is restricted, and the lower inner member 42 and the upper inner member 42 are integrally pulled downward. .
In addition, when the lower inner member 42 is pulled downward at a slow speed, the on-off valve 63 has a small opening force due to the viscous resistance of the silicone oil, so that the flow hole 62b remains open. Maintain state. Therefore, since the downward movement of the shaft portion 62 relative to the cylindrical portion 61 is allowed, even if the lower inner member 42 is pulled, the upper inner member 42 is not pulled.
In the present embodiment, a shocking large backrest load is generated by the occurrence of a rear-end collision of the vehicle, and the on-off valve 63 is closed against the movement in which the inner member 42 is pulled at a high speed. Is set to be. The opening / closing valve 63 is set so as not to be closed with respect to a movement in which the inner member 42 tends to be pulled at a low speed due to a backrest load accompanying normal seating use. That is, during normal seating use, even if a relatively large backrest load that pulls the inner member 42 is applied, the movement of the pulled inner member 42 can be absorbed inside the damper 60. Therefore, it can restrict | limit so that holding member Fb, Fb may not operate | move.

Next, the operation mechanism 50 will be described. Here, FIG. 2 shows an exploded perspective view of the operation mechanism 50. FIG. 3 is a perspective view showing the assembled state of the operation mechanism 50.
As shown in FIG. 2, the operation mechanism 50 includes a movable member 51, a fixed member 52, a first link 53, a second link 54, a first slider 55, and a second slider 56. Here, the first link 53 corresponds to one link member of the present invention, and the second link 54 corresponds to the other link member of the present invention.
Specifically, the movable member 51 is formed as a horizontally long plate member. As shown in FIG. 3, the movable member 51 is integrated with the horizontally long portion 22 of the formed wire 20 in the horizontally long fitting grooves 51a and 51a formed on the front side thereof. It is attached. Here, the formed wire 20 corresponds to the pushing member of the present invention. The movable member 51 is pivotally attached to both ends of a long hole-like engaging groove 51b formed on the rear surface thereof so that the front ends of the first link 53 and the second link 54 can be pivoted. Has been. As shown in FIG. 3, the movable member 51 is sandwiched between bending springs 30 and 30 (described later) disposed on both sides in the width direction when attached to the horizontally long portion 22 of the formed wire 20. It becomes a posture state. Thereby, the movable member 51 is hold | maintained as the state to which the movement to the width direction was controlled.
Next, the fixing member 52 is formed as a horizontally long plate member. The front surface of the fixing member 52 is formed in a mountain shape inclined toward the rear side toward the hems at both ends with the central portion in the width direction as a boundary. Guide portions 52a and 52b, into which the first slider 55 and the second slider 56 can be slidably moved in the width direction, are provided at the upper edge portion and the lower edge portion of the inclined surface formed in this mountain shape. Each is formed. The fixing member 52 is integrally fixed to the lower reinforcing plate 2t of the back frame 2f.

Next, the first link 53 is formed in a shape in which a linear wire member is bent in a C shape. The first link 53 is formed by hooking both ends of the C-shaped portion facing in the vertical direction shown on the right side in the drawing into hooking grooves 55c and 55c formed in the first slider 55, respectively. It is formed as pivot parts 53a and 53a pivotally attached to each other. In the first link 53, the vertically long portion shown on the left side in the drawing of FIG. 2 is hooked on the end portion on the left side in the drawing of the slot-like engaging groove 51 b formed in the movable member 51. As a result, it is formed as a pivot part 53b pivotally attached to the pivot part.
Next, the second link 54 is formed in a shape in which a central portion of a linear wire member is bent in a C shape. The second link 54 is pivotally pivoted by engaging longitudinally opposite ends of the second link 54 on the left side in the drawing with the engaging grooves 56c and 56c formed in the second slider 56. It is formed as pivot parts 54a, 54a which are pivotally mounted. The second link 54 has a central portion bent in a C-shape inserted through the back side of the second slider 56 so that both end portions thereof are hooked on the upper and lower engaging grooves 56c and 56c of the second slider 56, respectively. It can be put in. And the 2nd link 54 is the attitude | position state in which the center part bent by C shape represented on the right side in the paper surface of FIG. 2 was inserted in the C shape of the 1st link 53, and mutually crossed. A pivot part 54b is pivotally attached to the end of the long hole-like hooking groove 51b formed in the movable member 51 so as to be pivotally pivoted on the right end in the drawing.

Next, the first slider 55 is formed in a vertically long frame shape. A lower end portion of the outer member 41 of the cable member 40 is attached to the first slider 55. A concave outer mounting port 55a into which a constricted portion formed at the lower end portion of the outer member 41 can be fitted from the front side is formed in the central portion on the front side of the first slider 55. The first slider 55 is fitted by sliding the engagement portion 55b formed in the upper and lower portions on the rear surface side from the right end portion in the drawing of the guide portion 52a formed in the fixing member 52. The fixed member 52 is assembled so as to be slidable in the width direction along the inclined surface.
Next, the second slider 56 is formed in a vertically longer frame shape than the first slider 55. The lower end portion of the inner member 42 of the cable member 40 is attached to the second slider 56. An inner attachment opening 56a is formed at the center of the front surface side of the second slider 56 so that a T-shaped hook portion formed at the lower end of the inner member 42 can be hooked from the front surface side. The second slider 56 is fitted by sliding the engagement part 56b formed on the upper and lower parts on the rear surface side from the end of the guide part 52b formed on the fixing member 52 on the left side in the drawing. The fixed member 52 is assembled so as to be slidable in the width direction along the inclined surface.

As shown in FIG. 9, the operation mechanism 50 having the above-described configuration is moved in the assembled state by moving the movable member 51 toward or away from the rear side where the fixed member 52 is installed. The sliding movement is performed in such a manner that the crossing angle between the first link 53 and the second link 54 is increased or decreased. Specifically, the first link 53 and the second link 54 are slides at the rear end portions pivotally attached to the fixed members 52 before the movable member 51 is pushed and moved rearward (solid line state). The position is located at the center in the width direction, and the distance between each other is narrow. The first link 53 and the second link 54 are connected to the cable member 40 while the movable member 51 is pushed backward to slide the end portions on the rear side in the width direction. Increase the crossing angle on the rear side. As a result, the cable member 40 is pulled by the end portion of the inner member 42 and the end portion of the outer member 41 being separated from each other.
Here, as shown in the figure, the first link 53 and the second link 54 are formed to have the same link length. Further, the inclined surface on the front surface side of the fixing member 52 is formed with a symmetrical gradient. Accordingly, the end portions of the inner member 42 and the outer member 41 on the lower end side wired in the lateral direction of the cable member 40 are maintained when the first link 53 and the second link 54 are slid. Tow is operated in the state. Accordingly, the pulling operation of the cable member 40 can be performed straight in the axial direction.
Further, the first link 53 and the second link 54 are inclined surfaces formed on the front surface side of the fixed member 52 by receiving the movement of the movable member 51 being pushed backward. It is designed to slide along. As a result, the movement of the movable member 51 being pushed rearward is easily converted as a pressing force that slides the first slider 55 and the second slider 56 in the width direction, and is applied to the first link 53 and the second link 54. The load has been reduced. Further, the first link 53 and the second link 54 are pivotally attached to the movable member 51 and the fixed member 52, and the load acts only in the link length direction. It is difficult to apply the load.

Next, returning to FIG. 1, the formed wire 20 will be described. That is, the formed wire 20 is configured as a support member for elastically receiving a passenger's backrest load. The formed wire 20 is formed in a U-shape by bending a linear wire member.
The formed wire 20 has upper end portions 21u and 21u of two vertically elongated portions 21 and 21 extending in the longitudinal direction thereof inserted from the lower side into clips C and C attached to the front side of the upper reinforcing plate 2u. Has been. Thereby, the formed wire 20 is connected to the upper reinforcing plate 2u so as to be movable in the vertical direction.
As shown in FIG. 8, the formed wire 20 has a rigidity capable of maintaining the initial posture shape indicated by the solid line in a free state where the pressing force to the rear side is not received. Yes. Further, the form wire 20 is restored to its original initial posture shape (the shape shown by the solid line) again by the elasticity of itself when the backrest load pressed to the rear side is removed. It is supposed to be.
Further, the horizontally elongated portion 22 formed in the lower end portion of the formed wire 20 is elastically supported with respect to the lower reinforcing plate 2t by a pair of bending springs 30 and 30 provided at both ends in the width direction. Has been. The bending springs 30 and 30 act in an assisting manner with a supporting force that elastically receives the backrest load of the occupant by the formed wire 20. Here, the bending springs 30 and 30 are formed in a “<” symbol shape in a side view, and are formed by bending in the width direction on the front end side of the “<” character as shown in FIG. 1. The forearm portions 31 and 31 are fixed integrally with the laterally long portion 22 of the formed wire 20 by caulking. In addition, the rear arm portions 32 and 32 formed by bending in the width direction on the rear end side of the bending springs 30 and 30 have spring hook portions H formed by cutting and raising a part of the lower reinforcing plate 2t to the front side. , H, respectively.
As shown in FIG. 8, when the formed wire 20 is pushed backward by receiving the backrest load of the occupant as shown in FIG. 8, the bending springs 30, 30 are moved between the horizontally long portion 22 and the lower reinforcing plate 2t. It is bent and deformed in such a manner as to close the opening shape indicated by “ku”. And the bending springs 30 and 30 make the urging | biasing force act in the direction which pushes out the horizontally long site | part 22 of the formed wire 20 to the upper side with this bending deformation. As a result, as shown by the phantom line in the figure, the formed wire 20 is slid slightly upward by the urging force of the bending springs 30 and 30 when moving backward. ing. The upward movement of the formed wire 20 is absorbed by the movement of the upper end portions 21u and 21u upward with respect to the clips C and C, respectively.

Next, the usage method of a present Example is demonstrated.
That is, as shown by the phantom line in FIG. 4, in the normal initial state of the headrest 3, the support portion 3a is held in the initial position. Referring to FIG. 8, when a rear collision of the vehicle occurs, the back of the occupant is greatly pressed against the seat back 2 with the momentum, and the formed wire 20 is pushed backward. Thereby, the lower end of the cable member 40 is pulled by the operation mechanism 50, and the holding state of the headrest moving mechanism 10 by the holding members Fb and Fb is released as shown in FIG. As a result, the headrest moving mechanism 10 is rotated in the advancing direction (arrow direction) to the position where the contact surface 15b of the engagement arm portion 15 contacts the shaft support member Gb by the urging of the tension springs Sa and Sa. To do. As a result, as shown by the phantom line in the figure, the support portion 3a is moved from the initial position (solid line state) forward and upward to the collision corresponding position, and the head tilts backward at the same position. It will be ready to come. Returning to FIG. 4, when the support portion 3 a has moved to the collision corresponding position (solid line position), the received load accompanying the backward tilting of the head applied to the support portion 3 a causes the headrest moving mechanism 10 to be supported by the shaft support member. It acts as a pressing force for rotating in the traveling direction regulated by Gb. Therefore, the support portion 3a is not pushed back in the direction opposite to the traveling direction even when receiving the above-described receiving load, and receives the occupant's head at the collision corresponding position.
In order to return the support portion 3a moved to the collision-corresponding position (solid line position) to the original initial position (virtual line position), the headrest moving mechanism 10 is resisted against the bias of the tension springs Sa and Sa. What is necessary is just to operate so that it may return in the rotation direction opposite to the advancing direction (arrow direction). Thereby, the locking surface 15a of the engaging arm portion 15 can be automatically engaged with the holding members Fb, Fb held by the bias in the posture state shown by the solid line in FIG. The support 3a can be held in the initial position again.

  Thus, according to the vehicle seat of the present embodiment, the link members (the first link 53 and the second link 54) of the operation mechanism 50 that pulls the lower end of the cable member 40 are arranged in an intersecting manner. As a result, the link length of each link member can be overlapped, and the movement width in the slide movement direction can be kept small. Therefore, the operation mechanism 50 can be installed in a space-saving manner. Furthermore, by making the slide movement direction of the first link 53 and the second link 54 the width direction of the seat back 2, it can be connected to other structures such as lumbar supports and air conditioners installed at the upper and lower positions thereof. The operation mechanism 50 can be installed in a space-saving manner in the height direction so as to avoid interference. Further, since the first link 53 and the second link 54 are formed by linear wire members, the first link 53 and the second link 54 can be configured to be slidable in a state of crossing each other, and a pivot axis for the movable member 51 and the fixed member 52 is formed. Can be easily performed. And since a separate pivot is unnecessary, the number of parts can be reduced. Furthermore, by adopting a configuration in which the movable member 51 of the operation mechanism 50 arranged in the horizontal direction is attached to the horizontally long portion 22 of the formed wire 20 formed in a linear shape, the entire configuration can be formed in a smaller space. . Furthermore, since the pulling operation of the cable member 40 can be performed straight in the axial length direction, such an operation can be performed smoothly. Furthermore, by connecting the lower end of the cable member 40 to the rear end of the first link 53 or the second link 54, the cable member 40 can be disposed at a position close to the fixed member 52, and the traction operation can be performed. Since the amount of movement in the front-rear direction can be kept small, this installation space can be made more compact.

Although the embodiment of the present invention has been described with respect to one example, the present invention can be implemented in various forms in addition to the above-described example.
For example, the headrest moving mechanism may be configured to be pushed and pulled directly in the traveling direction by a cable member that has been pushed and pulled. Such a configuration in which the headrest moving mechanism is directly operated and operated is disclosed in documents such as JP-A-2005-104259.
Moreover, although the formed wire formed by bending a linear wire member is shown as the pushing member, a different member such as a planar plate member may be used. However, in this case, a separate assembly structure different from the above embodiment is required for connection with the movable member of the operation mechanism. In addition, although the horizontally long portion of the foam wire and the movable member of the operation mechanism are shown integrally attached, they are arranged separately from each other, and the movable wire is pushed and moved to the rear side. However, it may be configured to be pushed and moved in contact therewith.
Further, the slide movement direction in which the two link members of the operation mechanism increase or decrease the crossing angle with each other does not necessarily have to be the seat back width direction (sideways arrangement). However, other structures such as a lumbar support and an air conditioner may be arranged inside the seat back at positions above and below the operation mechanism. Therefore, it is necessary to devise an installation so that the operation mechanism and the cable member do not interfere with such other structures.
In addition, although the two link members are formed by linear wire members, they can be formed by plate members. However, in this case, it becomes difficult to adopt a configuration in which the two link members cross each other so as to be slidable, or separate pivot parts are required to pivot their ends with respect to the movable member or the fixed member. The configuration may be complicated.
Further, the two link members may be formed to have different link lengths, or the slope of the inclined surface on the front surface side of the fixing member may not be symmetrical on the left and right. However, in this case, the direction in which the cable member faces may change with the pulling operation of the cable member, so that the pulling operation cannot be performed smoothly or the cable member interferes with other structural members. It is necessary to pay attention to it.
Two link members may be pivotally attached to the movable member so as to be slidable.

It is a perspective view showing the internal structure of a seat back. It is a disassembled perspective view of an operation mechanism. It is a perspective view showing the assembly state of the operation mechanism. It is the block diagram which represented the action | operation mechanism of the headrest by the side view. It is a perspective view showing the initial posture state of the headrest moving mechanism. It is a perspective view showing the posture state after rotation of a headrest moving mechanism. It is the block diagram which represented the motion before and behind rotation of a headrest moving mechanism by the side view. It is a side view showing the deformation | transformation aspect of the formed wire. It is the IX-IX sectional view taken on the line of FIG. It is a block diagram showing the attachment structure of an inner member and a damper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat 2 Seat back 2f Back frame Fs Side frame Fu Upper frame 2s Support 2u Upper reinforcement board T Mounting plate part Mu Mounting port C Clip 2t Lower reinforcement board H Spring hook part 2r Reinforcement member 3 Headrest 3a Bearing part 3b Stay 3c Support bracket DESCRIPTION OF SYMBOLS 4 Reclining mechanism 4a Operation shaft 10 Headrest moving mechanism 10a-10d Connecting shaft 11 Movable link 12 Fixed link 13 Drive link 14 Drive link 15 Engagement arm part 15a Locking surface 15b Contact surface Sa Tension spring Sb Tension spring Au Upper arm support part Al Lower arm support part Gb Shaft support member Fb Holding member 20 Formed wire (pushing member)
DESCRIPTION OF SYMBOLS 21 Vertically long part 21u Upper end part 22 Horizontally long part 30 Bending spring 31 Forearm part 32 Rear arm part 40 Cable member 41 Outer member 42 Inner member 50 Operation mechanism 51 Movable member 51a Fitting groove 51b Engaging groove 52 Fixed member 52a Guide part 52b Guide Part 53 First link (one link member)
53a Axis part 53b Axis part 54 Second link (the other link member)
54a Pivot part 54b Pivot part 55 First slider 55a Outer attachment port 55b Engagement part 55c Engagement groove 56 Second slider 56a Inner attachment port 56b Engagement part 56c Engagement groove 60 Damper 61 Cylindrical part 62 Axle part 62a Partition plate 62b Flow hole 63 On-off valve 64 Compression spring P Load acting part of backrest load

Claims (6)

A vehicle seat provided with a headrest moving mechanism capable of moving a support portion of a headrest that receives a head of an occupant seated on a seat relative to a seatback at the time of a vehicle collision,
A pushing member disposed inside the shape of the seat back;
A transmission mechanism that transmits the movement of the pushing member to the headrest moving mechanism,
The pushing member is arranged so as to be pushed and moved to the rear side by receiving a backrest load applied to the back of the occupant against the seat back when a vehicle collision occurs,
The transmission mechanism is connected to the headrest moving mechanism at one end, and connected to the other end of the cable member, and receives the movement of the pushing member at the time of a vehicle collision to pull the other end of the cable member. An operation mechanism,
The cable member has a double structure in which a linear inner member is inserted into a tubular outer member so as to be relatively movable in the axial direction, and the inner member at the other end is pulled out from the outer member. When the operation is performed, the headrest moving mechanism is actuated to move the support portion from the normal initial position toward the collision corresponding position,
The operating mechanism includes a movable member that is pushed rearwardly integrally with the pusher member or in relation to the movement of the pusher member, and the seat back at a position on the rear side where the movable member is pushed and moved. A fixed member integrally disposed, and two link members disposed so as to be in a posture in which the fixed member and the movable member cross each other,
The two link members are connected to at least one of the movable member and the fixed member so as to be slidable in a direction in which the distance between the end portions is widened or narrowed. It is connected so as to increase or decrease the crossing angle of each other by moving it relatively close to or away from the fixed member,
In the connection structure between the other end of the cable member and the operation mechanism, the end of the outer member is connected to one link member of the operation mechanism, and the end of the inner member is the other of the operation mechanism. Connected to the link member,
The other end of the cable member is moved to the end of the inner member by a movement in which the two link members of the operation mechanism slide and move in the direction of increasing the crossing angle when the push member is pushed backward. A vehicle seat characterized in that the vehicle and the outer member are pulled apart from each other. The vehicle seat according to claim 1,
A vehicle seat characterized in that a sliding movement direction in which two link members of the operation mechanism increase or decrease a crossing angle with each other is a width direction of the seat back. The vehicle seat according to claim 1 or 2,
The two link members of the operation mechanism are formed by bending a linear wire member as appropriate. The vehicle seat according to any one of claims 1 to 3,
The pushing member is formed by bending a linear wire member as appropriate, and is elastically held at an initial position for receiving a backrest load from an occupant with its end connected to the seat back. And
The movable member of the operation mechanism is attached to a laterally long portion extending in the width direction of the seat back in the pushing member formed as the linear wire member, and the crossing angle between the two link members can be determined. A vehicular seat characterized in that the sliding direction to be increased or decreased is the width direction of the seat back. The vehicle seat according to any one of claims 1 to 4,
The two link members of the operation mechanism are formed to have the same link length, and slide in a direction to increase the crossing angle while maintaining the orientation of the other end of the cable member. Vehicle seat to be used. The vehicle seat according to any one of claims 1 to 5,
The two link members of the operation mechanism are pivotally attached to the movable member so that their end portions are pivotable, and the end portions are pivotable to the fixed member. And the vehicle seat characterized by being pivotally attached so that a slide movement is possible.

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