JP4759352B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat, and more particularly, to a vehicle seat that is suitably used as a passenger seat side seat that can approach an instrument panel by a long slide rail.

In a one-box type automobile, a vehicle having a three-row seat configuration including a front seat, a second seat, and a third seat is widely used as a seat arrangement. In such an automobile, the passenger seat in the first row is approached to the front instrument panel by a long slide rail in order to facilitate getting on and off, and to ensure a more comfortable ride and living space in a limited interior space. To be able to.
However, when the passenger seat is moved forward, the seat back and headrest of the passenger seat may interfere with the driving view. For this reason, the technique which ensures a driving | operation visual field by tilting a headrest ahead is disclosed (for example, refer patent document 1, patent document 2).

JP-A-8-117054 (FIG. 1) Japanese Patent Laying-Open No. 2004-203347 (FIG. 4)

  However, in the technologies disclosed in Patent Document 1 and Patent Document 2 described above, the headrest is supported so as to be able to tilt forward with respect to the support member attached to the seat back, but these are mainly behind the passenger seat. This is intended to ensure a forward view at the driver's seat, and is not sufficient to ensure the driver's view of the driver, particularly the door mirror on the passenger seat side.

  An object of the present invention is to provide a vehicle seat that can sufficiently ensure a driving field of view even when a passenger seat is brought close to an instrument panel.

A vehicle seat according to the present invention that can solve the above-mentioned problems is a vehicle seat that includes a seat cushion on which an occupant sits and a seat back that serves as a back of the occupant, and is provided on the seat back. Equipped with a headrest that can support the back of the passenger,
When the seat cushion is tipped up and folded, the seat back moves downward and the headrest falls forward .

In the vehicle seat configured as described above, when the passenger seat is advanced to the vicinity of the instrument panel, the front end of the seat cushion is lifted (tip-up) and folded to lower the seat back. Therefore, a wide driving field of view can be ensured. Also, when the passenger seat is advanced to the vicinity of the instrument panel, the front end of the seat cushion is lifted (tip up) and folded to lower the seat back and the headrest to the front, so the headrest is moved forward. A wider driving field of view can be ensured.

  Further, the vehicle seat according to the present invention includes a headrest provided on the seat back and capable of supporting the occupant's rear head, and the headrest moves forward by sliding the headrest to the lowest slide position. It is preferable to collapse.

  In the vehicle seat configured as described above, not only the seat back is lowered, but also the headrest can be tilted forward by sliding the headrest to the lowermost position of the slide, thus ensuring a wider driving field of view. be able to.

  In the vehicle seat according to the present invention, it is preferable that a headrest driving motor is turned on by tip-up of the seat cushion, and the headrest descends to the lower end by the power of the motor and then tilts forward.

  In the vehicle seat configured as described above, when the seat cushion is tipped up, the motor switch is turned on to lower the headrest, and when the lower end is reached, the headrest is tilted forward. In addition, since the height of the headrest is also reduced, it is possible to secure a sufficient driving field of view.

  In the vehicle seat according to the present invention, a throttle portion having a narrowed cross-sectional shape is provided on an upper portion of a headrest stay that supports the headrest, and only the throttle portion is provided in front of a stay bearing that supports the headrest stay so as to be movable up and down. It is preferable that a groove capable of passing in the tilt direction is provided.

  In the vehicle seat configured as described above, the headrest is normally supported by the stay bearing so as to be movable up and down, but when the headrest is moved downward and the throttle portion of the headrest stay is positioned at the stay bearing portion. Only allows forward tilt. Even at this position, it does not rotate backward.

  In the vehicle seat according to the present invention, a cushion side plate attached to a slide rail movable along a guide rail attached to the vehicle body, and a first end rotatably attached to the cushion side plate. A link, a second link attached to the cushion frame constituting the seat cushion and rotating integrally with the cushion frame around the center of rotation of the cushion frame, and a second link rotatably attached to the other end of the first link And a connecting plate that is rotatably provided on the second link and moves up and down in parallel with the tip of the seat cushion, and a back frame that forms the seat back is attached to the connecting plate. Preferably it is.

  In the vehicle seat configured as described above, when the front end of the seat cushion is lifted and folded, the second link attached to the cushion frame of the seat cushion integrally rotates to push down one end of the connecting plate. On the other hand, the other end of the connecting plate is pushed down by rotating a first link that is rotatably attached to a cushion side plate that is attached to a slide rail that is movable along a guide rail of the vehicle body. For this reason, the connecting plate is lowered in parallel, and the seat back attached to the connecting plate is lowered, so that a sufficient driving field of view can be secured.

  According to the present invention, when the passenger seat is advanced to the vicinity of the instrument panel as in the prior art, the seat back is displaced downward, and a sufficient driving field of view can be secured.

Hereinafter, an example of an embodiment of a vehicular seat concerning the present invention is explained in detail, referring to drawings.
(First embodiment)
FIG. 1 is a side view showing a normal use state of the vehicle seat of the present embodiment, and FIG. 2 is a side view of the vehicle seat in a state where the vehicle seat is advanced to the vicinity of the instrument panel.

  As shown in FIG. 1, the vehicle seat 10 of the present invention can support a passenger's rear head by being provided on a seat cushion 20 on which an occupant is seated, a seat back 30 that serves as a back of the occupant, and a seat back 30. The headrest 40 is provided. When the seat cushion 20 is folded up and folded, the seat back 30 moves downward. Further, the headrest 40 can be tilted forward.

The seat cushion 20 and the seat back 30 are connected by a link mechanism 50. In this link mechanism 50, a cushion side plate 21 that is attached to a slider 23 that is movable along the guide rail 12 of the vehicle body 11, and a first link 51 that is rotatably attached to the cushion frame 21 by a pin 51a. The second link 52, which is attached to the cushion frame 22 forming one of the seat cushions 20 and is rotated with the cushion frame 22 at one end, is attached to the cushion frame 21 by a pin 52a. An end of which is rotatably attached by a pin 51b, and a connecting plate 53 which is rotatably provided at the other end of the second link 52 by a pin 52b and moves up and down in parallel as the seat cushion 20 is tipped up. have.
And the back side frame 31 which forms the said seat back 30 is attached to the said connection plate 53 by the reclining mechanism centering on the axis | shaft 32 so that rotation is possible.

  The pin 52 a provided at one end of the second link 52 is supported so as to be rotatable at a fixed position with respect to the cushion side plate 21, and coincides with the rotation center of the seat cushion 20. That is, the pin 52a is pivotally supported through the second link 52 and the cushion frame 22, and the seat cushion 20 is pivotally supported around the pin 52a.

  Here, the pin 52 a and the pin 51 a are in a fixed position with respect to the cushion side plate 21, and the seat cushion 20 (and hence the second link 52) and the first link 51 rotate at a fixed position of the cushion side plate 21. Will be supported as possible. For this reason, the length of the first link 51 (distance between the pin 51a and the pin 51b) and the length of the second link 52 (distance between the pin 52a and the pin 52b) are set to substantially the same length, and FIG. If the axis 51c of the first link 51 and the axis 52c of the second link 52 are substantially parallel in the state, the pin 51a, the pin 51b, the pin 52a, and the pin 52b form a vertex of a substantially parallelogram. To do.

Therefore, when the vehicle seat 10 is advanced to the vicinity of the instrument panel 24 as shown in FIG. 2, if the front end of the seat cushion 20 is lifted upward (in the direction of arrow A in FIG. 1) and tipped up, the seat cushion 20 and Both the second links 52 attached to the seat cushion 20 integrally rotate downward (in the direction of arrow B in FIG. 1) around the pin 52a. As a result, the pin 52b on the other end side of the second link 52 rotates downward about the pin 52a, and the end portion on the second link 52 side of the connecting plate 53 is lowered. At this time, the end of the connecting plate 53 on the first link 51 side is also lowered by the downward rotation of the first link 51 (the direction of arrow C in FIG. 1). Therefore, when the seat cushion 20 is chipped up, the connecting plate 53 descends in parallel. As a result, the seat back 30 pivotally supported by the connecting plate 53 descends in parallel.
Since the back side frame 31 is rotatably attached to the connecting plate 53 via a reclining device (not shown), the back side frame 31 is lowered in parallel while maintaining an angle fixed by the reclining device. .

3 is a front view of the back frame and the headrest mounting portion as viewed from the front, FIG. 4 is a plan view of the headrest mounting portion as viewed from above, and FIG. 5 is a front view of FIG. FIG. 6 is a perspective view of the headrest mounting portion as viewed from the front.
As shown in FIG. 3, the headrest 40 is formed by covering a member 41 having a π shape or an inverted U shape with a headrest pad 42. The member 41 has a pair of headrest stays 41 a and 41 b extending vertically, and the lower ends of the headrest stays 41 a and 41 b are supported by a headrest stay holder 43. The headrest stays 41a and 41b are supported by a stay bearing 33 joined to a base plate 34 attached to the upper frame 31a and the left and right backside frames 31 so as to be movable up and down.

As shown in FIGS. 4 and 5, the headrest stays 41a and 41b are provided with a throttle portion 41c having a reduced cross-sectional shape at the upper portion thereof. The stay bearing 33 for supporting the headrest stays 41a and 41b so as to move up and down is provided. A groove 33a having a width that allows only the throttle portion 41c to pass in the forward tilt direction is provided.
Accordingly, the headrest stays 41a and 41b are supported by the stay bearings 33 so as to be movable up and down. 40 can be tilted forward.

  As shown in FIG. 3, a base plate 34 is attached to the left and right back side frames 31, 31 and the upper frame 31 a, and a pair of left and right guide rails 35, 35 are attached to the base plate 34. The guide rails 35 and 35 are provided in the vertical direction so as to be adjacent to the inside of the pair of headrest stays 41a and 41b described above, and the groove 35a (see FIG. 6) is parallel to the central axis of the headrest stays 41a and 41b. Is provided. A bent portion 35b is formed at the lower end portion of the groove 35a and is bent substantially rearward (backward in FIG. 3) at a substantially right angle.

One (left side in FIG. 3) headrest stay holder 43 and the other (right side in FIG. 3) headrest stay holder 43 are connected by a connecting member 45 penetrating the groove 35a.
Therefore, the connecting member 45 of the headrest stay holder 43 can move up and down along the groove 35 a of the guide rail 35, and the headrest stay holder 43 moves up and down along the guide rail 35 by pulling up or pushing down the headrest 40. Therefore, the headrest 40 can be moved up and down. At this time, the connecting member 45 slides up and down along the groove 35a of the guide rail 35, and when the headrest 40 reaches the slide bottom end position, the connecting member 45 is guided to the bent portion 35b of the groove 35a. When the throttle portions 41c of the stays 41a and 41b reach the position of the groove 33a, the headrest 40 falls forward and tilts forward to a horizontal or near-horizontal angle.

  The vertical height position when the headrest 40 is used (sitting state) is regulated by a plurality of positioning grooves 71 formed in the headrest stay 41a and the vertical movement of the headrest stays 41a and 41b by engaging with the positioning grooves 71. The stay lock 70 is fixed. When the vertical height position of the headrest 40 is adjusted, by pushing a push button provided on the stay lock 70, the engagement with the positioning groove 71 is released and the headrest 40 is moved up and down.

According to the vehicle seat 10 having such a configuration, the seat back 30 can be moved downward by tip-up of the seat cushion 20, and the headrest 40 can be tilted forward.
When the front end of the seat cushion 20 is lifted and folded, the second link 52 attached to the cushion frame 22 of the seat cushion 20 rotates to push down one end of the connecting plate 53. On the other hand, the other end of the connecting plate 53 is pushed down by rotating the second link 52 that is rotatably attached to the cushion side plate 21 attached to the vehicle body 11. As a result, the connecting plate 53 is lowered, so that the seat back 30 attached to the connecting plate 53 is lowered.

  As a result, the driver's driving field of view expands. However, by further disengaging the stay lock 70 and lowering the headrest 40 to the lowest position, the headrest 40 can be tilted forward to obtain a wider driving field of view. it can.

  On the other hand, when returning the vehicle seat 10 to the seating state, the front end of the seat cushion 20 that is tipped up is pushed downward to return to the seating state. Further, the headrest 40 is raised above the seat back 30 to adjust the vertical height position of the headrest 40 while releasing the engagement of the stay lock 70.

  As described above, according to the vehicle seat 10 described above, the seat back 30 is lowered by lifting (tip-up) and folding the front end of the seat cushion 20. Furthermore, since the headrest 40 can be tilted forward, even when the passenger seat 10 is advanced to the vicinity of the instrument panel 24, a sufficient driving field of view can be secured.

  In the above-described embodiment, the seat back can be moved downward and the headrest can be tilted forward by tipping up and folding the seat cushion. The seat back may only be able to move downward by tipping up and folding.

Next, an example of a second embodiment of the vehicle seat according to the present invention will be described in detail with reference to the drawings.
In addition, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment, and description is abbreviate | omitted.

  FIG. 7 is a front view of the back frame and the headrest mounting portion as viewed from the front, FIG. 8 is a rear view of the headrest mounting portion as viewed from the rear, and FIG. 9 is a plan view of the headrest mounting portion as viewed from above. FIG. 10 is a front view seen from the VI direction in FIG. 9, and FIG. 11 is a perspective view of the headrest mounting portion seen from the front.

  In this second embodiment, a ball nut 44 is attached to one (left side in FIG. 7) headrest stay holder 43 with a groove 35a of the guide rail 35 interposed therebetween, and this ball nut 44 and the other (in FIG. 7). The right side headrest stay holder 43 is connected by a connecting member 45 penetrating the groove 35a. In addition, a ball screw 36 screwed into the ball nut 44 is rotatably provided in parallel with the guide rail 35 inside one guide rail 35 on the front surface of the base plate 34, and the upper end of the ball screw 36 has a gear box 37a. And is connected to a motor 37 for driving the headrest.

  Therefore, the connecting member 45 of the headrest 40 can move up and down along the groove 35a of the guide rail 35, and the motor 37 moves the ball nut 44 up and down by rotating the ball screw 36 through the gear box 37a. Thereby, the headrest stay holder 43 can be moved up and down along the guide rail 35 to move the headrest 40 up and down. At this time, the connecting member 45 moves up and down along the groove 35a of the guide rail 35. When the headrest 40 reaches the lowest position, the ball nut 44 is guided to the bent portion 35b of the groove 35a, and the headrest 40 falls forward. Will tilt forward to a horizontal or near-horizontal angle.

The gear box 37 a and the motor 37 are attached to the front surface 34 a of the base plate 34, and are electrically connected to a control box 60 that controls the motor 37. Further, the ball nut 44 is provided with a first switch 62 as a sensor for detecting the forward tilt state of the headrest 40, and a detection for turning on / off the first switch 62 on the front surface 34a of the base plate 34 is provided. A plate 38 is erected in the vertical direction. The first switch 62 is electrically connected to the control box 60.
When the headrest 40 is used (sitting state), the vertical height position is adjusted by rotating the motor 37 with a switch (not shown) connected to the control box 60 and rotating the ball screw 36 via the gear box 37a. Can be performed.

FIG. 8 shows a headrest sensor.
As shown in FIG. 8, a notch 34c is provided in the vertical direction at the center of the base plate 34, and a second switch 63a as a pair of upper and lower sensors is provided on the back surface 34b of the base plate 34 in the vicinity of the notch 34c. The third switch 63b is attached and electrically connected to the control box 60. In addition, a detector 46 that projects to the back side of the base plate 34 is attached to a ball nut 44 that moves the headrest 40 up and down. The detector 46 contacts and turns on the upper second switch 63a when the ball nut 44 reaches the rising end, and the lower third switch 63a when the ball nut 44 reaches the lowering end. The switch 63b is touched to turn it on. Thereby, it is possible to detect whether the headrest 40 is at the rising end or the falling end.

  Table 1 shows the relationship between the first switch 62, the second switch 63a, the third switch 63b, and the state of the headrest 40.

  As shown in Table 1, when the first switch 62 and the second switch 63a are on and the third switch 63b is off, the control box 60 determines that the headrest 40 is at the rising end. Further, when the first switch 62 is on and the second switch 63a and the third switch 63b are off, it is determined that the headrest 40 is in the middle position between the rising end and the falling end. Further, when the first switch 62 and the third switch 63b are on and the second switch 63a is off, it is determined that the headrest 40 is at the lower end. Further, when all of the first switch 62, the second switch 63a, and the third switch 63b are off, it is determined that the headrest 40 is in a forward tilt state.

FIG. 12 shows a sensor attached to the vehicle seat.
As shown in FIG. 12, a detection plate 25 is attached to the cushion frame 22 side of the seat cushion 20, and a sensor that can be contacted with the detection plate 25 that rotates due to the tip-up of the seat cushion 20 on the cushion side plate 21 side. A seat cushion switch 61 is attached. The switch 61 is electrically connected to a control box 60 provided on the base plate 34 of the headrest 40, detects tip-up of the seat cushion 20, and transmits a signal to the control box 60.

Next, the operation when the seat cushion 20 is chipped up will be described.
When the front end of the seat cushion 20 is lifted and folded, the second link 52 attached to the cushion frame 22 of the seat cushion 20 rotates to push down one end of the connecting plate 53. On the other hand, the other end of the connecting plate 53 is pushed down by rotating the second link 52 that is rotatably attached to the cushion side plate 21 attached to the vehicle body 11. As a result, the connecting plate 53 is lowered, so that the seat back 30 attached to the connecting plate 53 is lowered.

  At the same time, when the seat cushion 20 is chipped up, the detection plate 25 attached to the cushion frame 22 rotates to turn on the switch 61 and transmit a signal to the control box 60. Based on this signal, the control box 60 starts the motor 37 and rotates the ball screw 36 via the gear box 37a. As a result, the ball nut 44 screwed into the ball screw 36 is lowered, and the headrest 40 is lowered.

  When the headrest 40 reaches the lower end, the third switch 63 b is turned on, and the throttle portions 41 c of the headrest stays 41 a and 41 b reach the stay bearing 33. Further, the connecting member 45 that connects the headrest stays 41 a and 41 b moves to the bent portion 35 b at the lower end of the guide rail 35. As a result, the throttle portions 41c of the headrest stays 41a and 41b pass through the groove 33a of the stay bearing 33, so that the headrest 40 tilts forward and the first switch 62 is turned off. As a result, since the first switch 62, the second switch 63a, and the third switch 63b are all turned off, the control box 60 stops the motor 37.

  On the other hand, when returning the vehicle seat 10 to the seating state, the front end of the seat cushion 20 that is tipped up is pushed downward to return to the seating state. Along with this, the detection plate 25 rotates to switch the switch 61 off. Based on this signal, the control box 60 reverses the motor 37 to return the headrest 40 from the forward tilt state and raise it through the ball screw 36 and the gear box 37a. As a result, the first switch 62 is turned on, and the second switch 63a and the third switch 63b are turned off. When the headrest 40 reaches the ascending end, the first switch 62 and the second switch 63a are turned on. Based on this signal, the control box 60 stops the motor 37 and finishes the ascent of the headrest 40.

  As described above, according to the vehicle seat 10 of the second embodiment described above, by lifting the front end of the seat cushion 20 (chip-up) and folding it, the seat back 30 descends and the headrest 40 falls forward. Even when the passenger seat 10 is advanced to the vicinity of the instrument panel 24, a sufficient driving field of view can be secured.

The vehicle seat of the present invention is not limited to the above-described embodiment, and appropriate modifications, improvements, and the like are possible.
For example, in the above-described embodiment, the front end of the seat cushion 20 is lifted and tipped up. However, the front end of the seat cushion 20 is urged by the urging means such as a spring so that the front end of the seat cushion 20 is raised. The seat cushion 20 may be used while being locked in a horizontal state, and when the tip is raised, the locking of the locking means may be released with a lever, and the tip may be raised by the urging means.

  In the above-described embodiment, the case where the headrest 40 is returned to the upper end when the vehicle seat 10 is returned to the seating state has been described. However, the headrest 40 may be stopped at the height position in the previous seating state. . In this case, it is necessary to provide position detecting means for detecting the height position of the headrest 40 and storage means for storing this position.

  As described above, the vehicle seat according to the present invention can solve the problem that the seat back and the headrest obstruct the driving view when the passenger seat is advanced to the vicinity of the instrument panel as in the prior art. The seat cushion and the headrest of the passenger seat that can approach the instrument panel by the long slide rail can be prevented from obstructing the driving view, for example, for the passenger seat It is useful as a vehicle seat.

It is a side view which shows the normal use condition of the vehicle seat which concerns on 1st Embodiment of this invention. It is a side view of the vehicle seat in a state where it is advanced to the vicinity of the instrument panel. It is the front view which looked at the back frame and the headrest attachment part from the front. It is the top view which looked at the attachment part of a headrest from upper direction. It is the front view seen from VI direction in FIG. It is the perspective view which looked at the attachment part of a headrest from the front. It is the front view which looked at the back frame and headrest attachment part of the vehicle seat which concern on 2nd Embodiment of this invention from the front. It is the top view which looked at the headrest attachment part from back. It is the top view which looked at the attachment part of a headrest from upper direction. It is the front view seen from VI direction in FIG. It is the perspective view which looked at the attachment part of a headrest from the front. It is a side view which shows the sensor attached to the vehicle seat.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle seat 11 Car body 20 Seat cushion 21 Cushion side plate 22 Cushion frame 30 Seat back 31 Back frame 33 Stay bearing 33a Groove 37 Motor 40 Headrest 41b Headrest stay 41c Aperture part 51 1st link 52 2nd link 53 Connecting plate

Claims (5)

A vehicle seat having a seat cushion on which an occupant is seated and a seat back that is a back of the occupant,
A headrest provided on the seat back and capable of supporting the back of the occupant;
A seat for a vehicle, wherein the seat back moves downward and the headrest falls forward when the seat cushion is folded up and folded . The vehicle seat according to claim 1 ,
A vehicle seat, wherein the headrest is tilted forward by sliding the headrest to a slide bottom end position. The vehicle seat according to claim 1 ,
A seat for a vehicle, wherein a headrest driving motor is turned on by tip-up of the seat cushion, and the headrest descends to a lower end by the power of the motor and then leans forward. The vehicle seat according to claim 2 or 3 ,
A throttle part with a reduced cross-sectional shape is provided on the upper part of the headrest stay that supports the headrest, and a groove that allows only the throttle part to pass forward is provided in a stay bearing that supports the headrest stay so as to be movable up and down. A vehicle seat characterized by the above. The vehicle seat according to any one of claims 1 to 4 ,
A cushion side plate attached to a slide rail movable along a guide rail attached to the vehicle body, a first link whose one end is rotatably attached to the cushion side plate, and a cushion frame constituting the seat cushion And a second link that rotates integrally with the cushion frame around the center of rotation of the cushion frame, and is rotatably attached to the other end of the first link and rotatably provided on the second link. And a connecting plate that moves up and down in parallel with the tip up of the seat cushion,
A vehicular seat, wherein a back frame forming the seat back is attached to the connecting plate.

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