JP2001287579A - Automotive seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely provide a whiplash reducing effect by adjustment even in the use by a person differed in build. SOLUTION: This automotive seat comprises a whiplash reducing means 20 for moving a headrest 10 forward by the backward movement of the back of an occupant in a backward collision, which is arranged on a seat back frame 2. A raising and lowering means 21 for simultaneously adjusting the whiplash reducing means 20 and the headrest 10 in the height direction is provided on the seat back frame 2, and the heights of the whiplash reducing means 20 and the headrest 10 are simultaneously adjusted by the raising and lowering means 21, whereby a whiplash reducing effect as designed can be surely provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat having a headrest.

[0002]

2. Description of the Related Art A headrest for receiving the occupant's head from behind is provided above a seat back of an automobile seat in order to reduce whispering of the occupant when the vehicle is hit rearward. However, when the headrest is fixed, the seat back inclines backward and the occupant's body rises obliquely rearward due to the acceleration of the entire seat due to the impact at the time of a rear-end collision and the occupant's inertia. However, a large load was applied to the neck due to the displacement above the headrest, and it was difficult to reliably reduce the whiplash of the occupant.

To cope with such a problem, Japanese Patent Application Laid-Open Nos.
In Japanese Patent Publication No. 19 and Patent No. 2914948, when an impact is caused by a rear impact, the headrest is moved forward by the movement of the occupant's upper body moving backward,
A proposal has been made to reduce whiplash by approaching the occupant's head.

A conventional example of this type of whiplash mitigation means will be described with reference to FIG. 4. The middle part in the vertical direction of a headrest support frame 42 on which a headrest 43 is mounted is attached to the side of the seat back frame 41. A pressure receiving portion 45 is provided at a position below the upper end so as to be rotatable back and forth by a pivot bracket 44 at a position below the headrest support frame 42, and a pressure receiving portion 45 for receiving a load applied from the front surface of the seat back is provided at a lower portion of the headrest support frame 42. Pressure receiving part 45 due to backward movement
The headrest 43 is largely moved forward with respect to the amount of movement of the headrest support frame 42, and the guide bracket 46 disposed at a portion corresponding to the lower portion of the headrest support frame 42 of the seat back frame 41 rotates the lower part of the headrest support frame 42. The headrest 43 is guided to prevent the headrest 43 from excessively moving forward by restricting the rotation end.
The lower part 2 is biased forward, and the headrest support frame 42 is positioned at an initial position with a constant biasing force. The headrest 43 is mounted on the headrest support frame 42 so that the vertical position can be adjusted.

[0005]

However, in the above configuration, when people of different physiques use the headrest 43, the height position of the headrest 43 can be adjusted, but the height of the pressure receiving portion 45 is fixed. However, at the time of a rear collision, the back position may not properly hit the pressure receiving portion 45, and the moving distance of the headrest 43 to the front may also change, so that the whiplash reducing effect as designed may not be obtained. is there.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, an object of the present invention is to provide an automobile seat that can surely obtain a whiplash reducing effect by adjustment even when used by persons of different physiques.

[0007]

SUMMARY OF THE INVENTION A vehicle seat according to the present invention is provided with a whiplash reducing means provided on a seat back frame for moving a headrest forward by a rearward movement of an occupant's back in a rear collision. In the seat, height-adjustment means for simultaneously adjusting the whiplash-reducing means and the headrest in the height direction is provided on the seat back frame, and the whiplash-reducing means and the headrest are simultaneously raised by the height adjustment means. It can be adjusted, and the whiplash reducing effect as designed can be reliably obtained.

[0008] The height adjusting means has an upper and lower divided structure in which the seat back frame is composed of an upper frame and a lower frame and is connected by a sliding engagement portion slidable in the vertical direction. When the lifting and lowering means for raising and lowering is provided, since the upper and lower frames are connected by sliding engagement portions, the height adjustment is performed by raising and lowering the upper frame by the lifting and lowering means while sufficiently securing the strength of the seat back frame. can do.

If at least the seat skin of the seat back and the seat cushion of the seat back is provided with an allowance for expansion and contraction according to the adjustment of the height adjusting means, at least the seat skin follows the height adjustment. The appearance such as the exposed seat back frame is not impaired.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vehicle seat according to an embodiment of the present invention; FIG.

In FIG. 1, reference numeral 1 denotes a seat back of an automobile seat, which is mounted on a seat cushion (not shown) so as to be reclined. Reference numeral 2 denotes a substantially inverted U-shaped seat back frame having a substantially inverted U-shaped upper frame 3 and a lower frame 4 on both lower sides thereof, which constitute a frame structure surrounding the left and right sides and the upper side of the seat back 1. And an upper and lower two-segment structure. The upper frame 3 includes side frame plates 5 on both sides formed by pressing a plate material into a substantially U-shaped cross section, and an upper pipe 6 obtained by bending a pipe material into a substantially U-shaped open downward shape. The lower end portions on both sides of the upper pipe 6 are integrally fixed to the upper end portion of the side frame plate 5. The lower frame 4 is formed by pressing a plate material into a substantially U-shaped cross section. The lower portion of the side frame plate 5 of the upper frame 3 is fitted to the upper portion of the lower frame 4 to form a sliding engagement portion 7. Are slidably connected in the vertical direction.

A pivot bracket 8 having a substantially U-shaped cross section is disposed at a position below the upper end of both sides of the upper pipe 6 by an appropriate distance, and both flanges thereof are brought into contact with the outer surface of the upper pipe 6 and welded. It is fixed at. A guide bracket 9 having a substantially U-shaped cross section is provided at a position below the upper end of the side frame plate 5 by an appropriate distance, and its flange portion is provided on the inner surface of the rising flange 5a in front of and behind the side frame plate 5. It is abutted and fixed by welding.

Reference numeral 10 denotes a headrest provided on the upper portion of the seat back 1, and a pair of stays 11 extend downward from both lower sides thereof.

Reference numeral 12 denotes a headrest support frame for supporting the headrest 10. The headrest support frame 12 is constituted by a pipe frame 13 which is formed by bending a pipe material into an approximately U-shape which is opened downward, and both sides of which are flat except for the upper end. To form a flat portion 13a. The headrest support frame 12 is formed to have a width so as to be substantially fitted inside the seat back frame 2, and the upper end of the pipe frame 13 is located immediately below the upper pipe 6. Flat part 13
The upper part of a is pivotally supported by the pivot bracket 8 with a stepped bolt 14, and the headrest support frame 12 is supported by the seat back frame 2 so as to be able to swing back and forth.

The lower end of the flat portion 13a is guided by a guide bracket 9 so as to be movable back and forth, and is connected by a pressure receiving member 15 whose vertical cross section is made of a substantially U-shaped member or a pipe material. The pressure receiving member 15 receives a load acting on the front surface of the seat back 1 due to the inertia of the occupant's chest during a rear collision. At the upper part of the pipe frame 13, the lower ends of a pair of support cylinders 16 capable of inserting and removing the stay 11 and fixing it at an arbitrary position are fixed by welding.
0 is configured to be supported in a height-adjustable manner.

A tension spring 17 is interposed between the lower end of the headrest support frame 12 and the rising flange 5a in front of the side frame plate 5 of the seat back frame 2, and a certain load or more is applied to the pressure receiving member 15. The configuration is such that the lower part of the headrest support frame 12 does not rotate backward if it does not act. The headrest support frame 12, the stepped bolt 14, the pressure receiving member 15, the support cylinder 16 and the tension spring 17 constitute the whiplash reducing means 20.

As height adjusting means for simultaneously adjusting the position of the whiplash reducing means 20 and the headrest 10 in the height direction, an elevating means 21 for elevating the upper frame 3 of the seat back frame 2 with respect to the lower frame 4 includes a seat. It is disposed inside the sliding engagement portion 7 on both sides of the back frame 2.

In FIG. 2 showing the detailed structure of the lifting / lowering means 21, a rectangular box case 22 having an open outer surface is shown.
Are arranged inside the sliding engagement portion 7, the lower portion is fixed to the lower frame 4, and the upper portion is configured so that the lower end portion of the upper frame 3 can be inserted and withdrawn. Bearings 23a and 23b are provided at the lower end and the upper end of the box case 22, and both ends of a screw shaft 24 extending in the sliding direction of the sliding engagement portion 7 are rotatably supported. A nut member 25 screwed to the screw shaft 24 is fixed to the upper frame 3. A bevel gear 26a is fixed to the lower end of the screw shaft 24,
A bevel gear 26b meshing with the bevel gear 26a is arranged in the box case 22.

A drive motor 27 having a motor shaft penetrating on both sides thereof is disposed inside the inner side wall 22a of the box case 22 of one of the elevating means 21 on both sides of the seat back frame 2. A bevel gear 26b is fixed to one end of the motor shaft protruding into the box case 22, and one end of a connection shaft 29 is connected via a shaft coupling 28 to the other end of the motor shaft protruding to the opposite side. . Connecting shaft 2
9 is a box case 22 of the other lifting / lowering means 21.
A bevel gear 26b is fixed by being supported by a bearing 30 disposed inside the inner wall 22a of the inner case 22 and protruding into the box case 22. Thus, when the drive motor 27 is driven, the screw shafts 24 of the lifting means 21 on both sides rotate synchronously via the connecting shaft 29 and bevel gears 26b and 26a, and the both sides of the upper frame 3 are The height position of the whiplash reducing means 20 and the headrest 10 which are raised and lowered with respect to the lower frame 4 and which are arranged on the upper frame 3 are adjusted at the same time.

Further, as shown in FIG.
At the lower end of the seat skin 31, there is provided an expansion / contraction allowance 32 for adjusting the height position of the upper frame 3 by the lifting / lowering means 21. Also, a seat back cushion (not shown) inside the seat skin 31 is provided with an expansion / contraction margin at the lower end thereof, but the lower end of the seat back 1 may not hit the back of the occupant or the back of the waist. Since there is almost no space, only the space may be formed below the lower end of the seat back cushion when the upper frame 3 is raised.

Although not shown, the pressure receiving member 1
Locking pawls and a ratchet mechanism for locking the headrest 10 in the forward-moving state when the pivoting member 5 rotates backward are provided on the pivot bracket 8 or the guide bracket 9.

In the above configuration, in a normal state before a rear collision, the lower portion of the headrest support frame 12 is urged forward by a tension spring 17 as shown in the drawing, and
Are engaged with the upper pipe 6, and the headrest 10 is stationary.

Next, when the vehicle is back-collimated, the seat is impacted forward and the upper body of the occupant is moved rearward by the reaction, and a large load is applied to the front of the seatback 1 rearward. Acts, the pressure receiving member 15 is strongly pressed rearward, and the lower part of the headrest support frame 12 turns backward around the axis of the stepped bolt 14 in the pivot bracket 8 against the urging force of the tension spring 17. The headrest 10 above the headrest support frame 12 moves forward. At this time, the headrest 10 moves the distance between the headrest 10 and the stepped bolt 14, the stepped bolt 14 and the pressure receiving member 1 with respect to the amount of backward movement of the pressure receiving member 15.
Since the head bracket 10 is moved forward by enlarging by the ratio of the distance between the headrests 5, a large amount of forward movement of the headrest 10 can be secured by disposing the pivot bracket 8 below, and the headrest of the occupant is moved by the headrest 10. The occupant can be reliably received, and the occupant's neck can be protected to effectively prevent whiplash.

Further, since the headrest support frame 12 is pivotally supported by the pivot bracket 8 disposed on the side of the seat back frame 2, the headrest support frame 12 has sufficient rigidity to withstand an impact and the back of the occupant's back. , Only the pressure receiving member 15 is located, so that operation stability is high and desired performance can be secured.

Also, since the headrest 10 is locked while moving forward, the subsequent reaction causes the upper body of the occupant to move forward while the head remains inertial, so that the head relatively swings backward. Even if it is, the head can be reliably received by the headrest 10 located forward, so that the occupant's neck can be protected and whiplash injury can be prevented.

Further, when a person having a different physique is used, the drive motor 27 of the lifting / lowering means 21 is driven to adjust the height position of the upper frame 3 as described above.
The height of the whiplash-reducing means 20 and the headrest 10 can be adjusted at the same time, so that the whiplash-reducing effect as designed can be reliably obtained regardless of the size of the person.

Further, since the upper frame 3 and the lower frame 4 are connected by the sliding engagement portion 7, the upper frame 3 can be moved up and down by the elevating means 21 while securing the strength of the seat back frame 2 sufficiently. Thereby, the height of the whiplash-reducing means 20 and the headrest 10 can be adjusted as described above.

Further, since the extension allowance 32 of the seat skin 31 of the seat back 1 follows the height adjustment, the appearance such as the exposed seat back frame 2 due to the height adjustment is not impaired.

In the above embodiment, the seat back frame 2 is divided into an upper frame 3 and a lower frame 4 as means for simultaneously adjusting the height of the whiplash reducing means 20 and the headrest 10, and the upper frame 3 is raised and lowered. Although an example is shown, a mechanism for supporting the whiplash-reducing means 20 and the headrest 10 so as to be able to move up and down with respect to the seatback frame 2 may be provided, and the up and down adjustment is performed by the drive motor 27. Although an example has been shown, manual adjustment may be performed by rotating a manual knob or the like, and an example in which the screw shaft 24 and the nut member 25 are used as the elevating means 21 has been described. Other mechanisms may be used. Further, the whiplash reducing means 20 is not limited to the configuration of the above-described embodiment, and the present invention can be applied to the whiplash reducing means 20 having various configurations.

[0030]

According to the vehicle seat of the present invention, as is apparent from the above description, the seat back frame is provided with height adjusting means for simultaneously adjusting the whiplash reducing means and the headrest in the height direction. Therefore, the height adjustment means can simultaneously adjust the height of the whiplash reduction means and the headrest, and even when used by people of different physiques, the whiplash reduction effect as designed can be reliably obtained by adjustment. .

Further, the height adjusting means has an upper and lower two-part structure in which the seat back frame is composed of an upper frame and a lower frame, and is connected by sliding engagement portions which can slide in the vertical direction. When the lifting and lowering means for raising and lowering is provided, since the upper and lower frames are connected by sliding engagement portions, the height adjustment is performed by raising and lowering the upper frame by the lifting and lowering means while sufficiently securing the strength of the seat back frame. can do.

If at least the seat skin of the seat back and the seat cushion of the seat back is provided with an allowance for expansion and contraction accompanying adjustment of the height adjusting means, at least the seat skin follows the height adjustment. The appearance such as the exposed seat back frame is not impaired.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of an embodiment of an automobile seat according to the present invention.

FIG. 2 is a longitudinal sectional view showing a configuration of a main part of the embodiment.

FIG. 3 is an overall perspective view of the embodiment.

FIG. 4 is a perspective view illustrating a schematic configuration of a conventional automobile seat.

[Explanation of symbols]

 2 Seat back frame 3 Upper frame 4 Lower frame 7 Sliding engagement part 10 Headrest 20 Whiplash reducing means 21 Elevating means (height adjusting means) 31 Seat skin 32 Expansion and contraction allowance

Claims (3)

[Claims] 1. An automobile seat in which a whiplash reducing means for moving a headrest forward by a rearward movement of an occupant's back at the time of a rear collision is provided in a seat back frame, wherein the whiplash reducing means and the headrest are simultaneously raised. An automobile seat characterized in that height adjustment means for adjusting the height of the seat is provided on a seat back frame. 2. The height adjusting means comprises a seat back frame having an upper frame and a lower frame, and a two-part structure in which the seat back frame is connected by a sliding engagement portion slidable in a vertical direction. 2. The vehicle seat according to claim 1, wherein a lifting means for raising and lowering is provided. 3. The automobile seat according to claim 1, wherein at least the seat skin of the seat back and the seat cushion of the seat back is provided with an allowance for expansion and contraction in accordance with the adjustment of the height adjusting means.