JP2008254721A - Vehicular seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular seat of a simple constitution for properly adjusting a stroke quantity of a headrest, by quickly moving the headrest forward, in a collision from the rear of a vehicle, by normally securing a clearance between an occupant head part and the headrest. <P>SOLUTION: A seat back frame is composed of: a pair of side frame 6 tiltably installed in a seat cushion frame 2; and a sub-frame 8 installed in a side frame 6 via a rotary hinge 22. A pressure receiving plate 20 is installed in a lower part of the sub-frame 8, and rocking range regulating means 6b and 26 are arranged for regulating a rocking range of the sub-frame 8 to the side frame 6. A coil spring 30 is also arranged for energizing a lower part of the sub-frame 8 forward. When a load of a predetermined value or more is inputted from the rear of the vehicle, the pressure receiving plate 20 is moved backward by a waist part of an occupant, and the sub-frame 8 is rocked around the rotary hinge 22, and the headrest 10 is moved forward. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle seat that can prevent whiplash of an occupant when a collision is caused from the rear of the vehicle.

  A vehicle seat is usually provided with a headrest above the seat back, and when the occupant is seated, there is a predetermined gap between the occupant's head and the headrest, and the vehicle seat collides from the rear of the vehicle. The body moves forward while the head remains behind, which can cause a load on the neck and cause whiplash.

  Therefore, it is possible to reduce the gap between the headrest and the headrest to minimize damage, but even in normal use, the head may touch the headrest or move the head slightly to interfere with the headrest. And uncomfortable.

In addition, the headrest connected to the pressure receiving portion is swingably attached and is always urged rearward by a coil spring, and in the event of a collision (rear collision) from the rear of the vehicle, the urging force of the coil spring is applied by the load input to the pressure receiving portion. Against this, a configuration has been proposed in which the headrest is moved forward to support the head of the occupant (see, for example, Patent Document 1).
JP 2001-39194 A

  According to the rear-end collision test, it is known that the load from the human body is initially high in the waist, and then the chest and head are high. However, in the vehicle seat described in Patent Document 1, the pressure receiving portion faces the back of the occupant. Since the headrest is provided at a position where the headrest moves, the headrest moves forward slightly at the time of rear-end collision.

  Further, in the configuration described in Patent Document 1, since the pressure receiving portion is close to the swing center of the headrest, there is a limit to the adjustment range of the stroke amount of the headrest.

  The present invention has been made in view of the above-described problems of the prior art. Usually, a gap between the passenger's head and the headrest is secured, and the headrest is quickly moved forward in the event of a collision from the rear of the vehicle. An object of the present invention is to provide a vehicular seat having a simple configuration that can be moved and the stroke amount of a headrest can be adjusted as appropriate.

  In order to achieve the above object, the invention according to claim 1 is a seat cushion, a seat back that is tiltably attached to the seat cushion, and an upper portion of the seat back. In a vehicle seat having a headrest, a seat back frame having a seat cushion frame, a pair of side frames tiltably attached to the seat cushion frame, and a subframe attached to the side frame via a rotary hinge A pressure receiving member attached to a lower portion of the subframe and facing a waist of an occupant, and a swing range provided on the side frame and the subframe for regulating a swing range of the subframe relative to the side frame And a biasing means and a lower portion of the subframe forward. An elastic member that urges the headrest rearward, and when a load greater than a predetermined value is input from the rear of the vehicle, the sub-frame is rotated by moving the pressure receiving member rearward by the waist of the occupant The headrest is moved forward by swinging around a hinge.

  According to a second aspect of the present invention, the swing range regulating means is configured by a guide hole formed in the side frame and a bolt loosely inserted into the guide hole and attached to the subframe. Features.

  Further, the invention according to claim 3 is characterized in that the swing range regulating means is disposed in proximity to a reclining device for tiltably attaching the pair of side frames to the seat cushion frame.

  The invention according to claim 4 is characterized in that the distance from the rotation center of the reclining device to the bolt is set to be ½ or less of the distance from the rotation center of the reclining device to the rotary hinge. To do.

  According to a fifth aspect of the present invention, the elastic member is formed of a tension coil spring, one end of the tension coil spring is locked to the pressure receiving member, and the other end of the tension coil spring is connected to the side frame. It is characterized by being locked.

  According to the present invention, when a load of a predetermined value or more is input from the rear of the vehicle, the pressure receiving member is moved rearward by the occupant's waist, the subframe is swung around the rotary hinge, and the headrest is moved forward. Therefore, the head of the occupant can be quickly supported by the headrest at the time of rear collision.

  Moreover, since the pressure receiving member is provided at a position facing the occupant's waist, the stroke amount of the headrest can be adjusted over a wide range by appropriately selecting the position of the rotary hinge.

  Further, since the bolt is loosely inserted into the guide hole formed in the side frame and the bolt is attached to the sub frame to regulate the swing range of the sub frame relative to the side frame, the configuration is simple.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a seat frame F of a vehicle seat according to the present invention, and a seat cushion frame 2 attached to a slide device S for appropriately adjusting the position of the seat in the front-rear direction, and a reclining to the seat cushion frame 2 A pair of left and right side frames 6 attached via the device 4 and a subframe 8 attached to the side frame 6 are configured. The side frame 6 and the subframe 8 constitute a seat back frame. The seat cushion and the seat back are respectively attached to the seat cushion frame 2 and the seat back frames 6 and 8, and the headrest 10 is attached to the upper portion of the sub frame 8.

  The left and right reclining devices 4 are connected via a connecting shaft 12 (see FIG. 2 or FIG. 4). By operating an operation lever (not shown) attached to one of the reclining devices 4, the side frame 6 Is set to a desired angle.

  As shown in FIGS. 2 to 4, the reclining device 4 includes a seat cushion side bracket 16 attached to the seat cushion frame 2 and a seat back side bracket 18 attached to the seat cushion side bracket 16 so as to be swingable. However, since the reclining device 4 is not the main point of the present invention, detailed description thereof will be omitted.

  A side frame 6 is attached to the seat back side bracket 18 of the reclining device 4. A rotary hinge insertion hole 6 a is formed in the upper part of the side frame 6, and a swing range described later is provided in the lower part of the side frame 6. A guide hole 6b into which the restriction bolt is loosely inserted is formed. The guide hole 6b has an arc-shaped long hole shape centered on the rotary hinge insertion hole 6a.

  On the other hand, the sub-frame 8 is bent in an inverted U shape, and the sub-frame 8 includes a rotation hinge insertion hole 8a at a portion facing the rotation hinge insertion hole 6a and the guide hole 6b formed in the side frame 6. A swing range regulating bolt insertion hole 8b is formed, and both ends of a pressure receiving plate (pressure receiving member) 20 facing the occupant's waist are attached to the subframe 8 positioned below the swing range regulating bolt insertion hole 8b. ing.

  As shown in FIGS. 5 and 6, the both sides of the sub-frame 8 are rotated inside the former rotary hinge insertion hole 6a and the latter rotary hinge insertion hole 6a in a state where both side portions are arranged inside the pair of left and right side frames 6. The hinge bolt 22 is inserted from the inside and the nut 24 is screwed together. The swing range restricting bolt 26 is inserted from the outside into the former swing range restricting bolt insertion hole 8b and the latter guide hole 6b, and the nut 28 is inserted. Screwed together.

  Since the rotary hinge bolt 22 is the center of rotation (swing) of the subframe 8 relative to the side frame 6, as shown in FIG. 5, the peripheral portion of the rotary hinge bolt 22 and the rotary hinge insertion hole 6a of the side frame 6 is used. The swing range regulating bolt 26 is for regulating the swing range of the subframe 8 with respect to the side frame 6, and there is almost no clearance between them. As shown in FIG. Some clearance is provided between the range regulating bolt 26 and the peripheral edge portion of the guide hole 6 b of the side frame 6.

  As shown in FIGS. 4 and 7, one end of the coil spring 30 is locked to each end of the pressure receiving plate 20, and the other end of the coil spring 30 is locked to the lower end of the side frame 6. In addition, the elastic force of the coil spring 30 urges the lower end portion of the subframe 8 forward and urges the headrest 10 backward.

  When the vehicle seat according to the present invention having the above configuration is normally seated, the swing range regulating bolt 26 is positioned at the front end of the guide hole 6b by the elastic force of the coil spring 30 as shown in FIG. In this state, the upper body of the occupant is supported by the seat back frames 6 and 8. Moreover, the headrest 10 attached to the upper part of the sub-frame 8 is separated from the passenger's head at a predetermined interval.

  On the other hand, for example, when a collision (rear collision) occurs from the rear of the vehicle and a load greater than a predetermined value is input from the rear, the human body is relatively pressed against the seat back. At this time, the waist part pushes the pressure receiving plate 20 provided at the lower part of the subframe 8 backward by the movement of the human body, so that the subframe 8 is opposed to the elastic force of the coil spring 30 and the side frame 6 On the other hand, the rotating hinge bolt 22 is rotated in the direction of arrow A in FIG. 3, and the lower end portion of the sub-frame 8 moves rearward. As a result, the swing range regulating bolt 26 moves from the front end of the guide hole 6b toward the rear end along the guide hole 6b, so that the headrest 10 moves toward the head of the occupant and moves the head of the occupant. Will support the part.

  FIG. 9 shows a normal seating state (a) and an operating state (b) of the subframe 8 and the headrest 10 at the time of rear collision.

  After the rear impact, the subframe 8 rotates in the direction opposite to the arrow A around the rotating hinge bolt 22 with respect to the side frame 6 by the elastic force of the coil spring 30, and the lower end of the subframe 8 moves forward. As a result, the swing range regulating bolt 26 moves from the rear end portion of the guide hole 6b toward the front end portion along the guide hole 6b, so that the headrest 10 is separated from the head of the occupant.

  In consideration of the weight of the occupant and the like, the elastic force of the coil spring 30 is set so that the operation load of the sub-frame 8 is operated at about 100 N or more.

  In the above embodiment, the stroke amount of the headrest 10 is reduced by changing the position of the rotary hinge bolt 22 to change the distance from the swing range regulating bolt 26 or changing the length of the guide hole 6b. It can be adjusted as appropriate.

  However, it is preferable that the swing range regulating bolt 26 is disposed close to the reclining device 4. That is, as shown in FIG. 9B, at the time of rear collision, the swing range regulating bolt 26 collides with the rear edge portion of the guide hole 6b of the side frame 6, and the swing range regulating bolt 26 and the guide An impact load is input to the rear edge of the hole 6b, and a moment equal to the product of the distance from the rotation center of the reclining device 4 to the swing range regulating bolt 26 and the impact load is applied to the reclining device 4. At the same time, a similar moment is applied to the side frame 6. Therefore, if the distance from the rotation center of the reclining device 4 to the swing range regulating bolt 26 is long, this moment increases and the rigidity of the side frame 6 and the reclining device 4 needs to be increased. By arranging the bolts 26 close to the reclining device 4, it is not necessary to excessively increase the rigidity of the side frames 6 and the reclining device 4.

  The distance from the rotation center of the reclining device 4 to the swing range regulating bolt 26 is preferably ½ or less, more preferably ３ or less of the distance from the rotation center of the reclining device 4 to the rotating hinge bolt 22. preferable.

  Furthermore, in the above-described embodiment, one end of the coil spring 30 is locked to the pressure receiving plate 20. However, one end of the coil spring 30 is locked to the lower portion of the subframe 8 other than the pressure receiving plate 20. Good.

  In the above embodiment, the tension coil spring 30 is employed as an elastic member for urging the subframe 8. However, other than the tension coil spring, an elastic member such as a compression coil spring, a spiral spring, or a torsion bar is used. You can also.

  The vehicle seat according to the present invention can quickly move the headrest at the time of rear collision to support the head of the occupant, so that the vehicle seat can prevent whiplash of the occupant with a simple configuration. Useful.

It is a perspective view of a seat frame which constitutes a vehicular seat concerning the present invention. It is a front view of the seat back frame which comprises the seat frame of FIG. FIG. 3 is a side view of the seat back frame of FIG. 2. FIG. 3 is an exploded perspective view of the seat back frame of FIG. 2. FIG. 5 is a cross-sectional view taken along line VV in FIG. 3. FIG. 4 is a cross-sectional view taken along line VI-VI in FIG. 3. FIG. 3 is a perspective view of a lower portion of the seat back frame of FIG. 2. It is a perspective view of the intermediate part of the seat back frame of FIG. The side view of the vehicle seat concerning this invention is shown, (a) is the time of normal seating, (b) has shown the state at the time of a rear collision, respectively.

Explanation of symbols

2 seat cushion frame, 4 reclining device, 6 side frame,
6a Rotating hinge insertion hole, 6b Guide hole, 8 Subframe,
8a Rotating hinge insertion hole, 8b Swing range regulation bolt insertion hole, 10 Headrest,
12 connecting shaft, 16 seat cushion side bracket,
18 Seat back side bracket, 20 Pressure receiving plate, 22 Bolt for rotating hinge,
24 nuts, 26 swing range regulating bolts, 28 nuts, 30 coil springs,
F seat frame, S slide device.

Claims (5)

In a vehicle seat having a seat cushion, a seat back that is tiltably attached to the seat cushion, and a headrest attached to an upper portion of the seat back,
A seat back frame having a seat cushion frame, a pair of side frames tiltably attached to the seat cushion frame, and a sub frame attached to the side frame via a rotary hinge, and attached to a lower portion of the sub frame A pressure receiving member opposed to the waist of the occupant, a swing range regulating means provided on the side frame and the sub frame for regulating a swing range of the sub frame relative to the side frame, and a lower portion of the sub frame An elastic member that urges the headrest forward and urges the headrest rearward.When a load of a predetermined value or more is input from the rear of the vehicle, the pressure-receiving member is moved rearward by the occupant's waist, The sub frame is swung around the rotary hinge, and the headrest is moved forward. Vehicle seat, characterized in that the so that.   2. The vehicle according to claim 1, wherein the swinging range restricting means includes a guide hole formed in the side frame, and a bolt loosely inserted into the guide hole and attached to the subframe. Sheet.   3. The vehicle seat according to claim 2, wherein the swing range regulating means is disposed in proximity to a reclining device for tiltably attaching the pair of side frames to the seat cushion frame.   4. The vehicle seat according to claim 3, wherein a distance from a rotation center of the reclining device to the bolt is set to ½ or less of a distance from the rotation center of the reclining device to the rotary hinge.   The elastic member is constituted by a tension coil spring, and one end of the tension coil spring is locked to the pressure receiving member, and the other end of the tension coil spring is locked to the side frame. The vehicle seat according to any one of 1 to 4.

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