JP3619041B2 - Automotive seat - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automobile seat provided with a headrest, and more particularly to an automobile seat provided with a mechanism for moving the headrest to the vicinity of the occupant's head in order to reduce an occupant's whip trouble when a rear-end collision occurs.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a headrest that receives the head of an occupant from behind is disposed above a seat back of an automobile seat in order to prevent the occupant from hitting the vehicle when the automobile is rear-end collision. However, with a fixed headrest, the seat back tilts backward and the occupant's body rises obliquely backward due to the acceleration of the entire seat and the inertia of the occupant due to the impact at the time of rear-end collision. However, it was difficult to reliably prevent the occupant's whiplash from occurring due to a large load acting on the neck due to displacement above the headrest.
[0003]
In order to deal with such problems, the present applicant previously proposed a structure as shown in FIG. 7 in Japanese Utility Model Laid-Open No. 7-1842.
[0004]
In FIG. 7, the movement of the upper body of the occupant moves rearward when an impact is applied from the rear as shown by the white arrow by the rear-end collision from the normal state as shown in FIG. 7A, as shown in FIG. 7B. As a result, the impact pressure receiving frame 32 disposed in front of the seat back frame 31 is bent at the lower rigid portion 33 and moved backward, and the headrest support arm 34 connected to the impact pressure receiving frame 32 is moved along with the rearward movement. The headrest 36 provided at the upper end of the headrest support arm 34 is moved forward by rotating around the upper side portion of the seatback frame 31 via the rotation support portion 35. In this way, the headrest 36 is moved forward by the rearward movement of the upper body of the occupant during the rear-end collision, and the whiplash failure is prevented by approaching the occupant's head.
[0005]
Further, as shown in FIG. 8, the upper portion of the headrest support frame 43 is supported by a bearing portion 42 provided at the upper end portion of the seat back frame 41 so as to be able to rotate back and forth and slide up and down. The headrest 44 is provided with an impact pressure receiving portion 45 at the lower end portion of the headrest support frame 43, and the other end of the vertical swing lever 46 pivotally supported at one end on the seat back frame 41 is pivoted to the lower end portion of the headrest support frame 43. There has also been proposed an apparatus provided with a biasing means 47 that supports and swings the middle part of the vertical swing lever 46 downward.
[0006]
In this configuration, when the impact pressure receiving portion 45 is pressed rearward by the rearward movement of the upper body of the occupant during the rear-end collision, the lower end portion of the headrest support frame 43 is connected to the up and down swing lever 46, thereby the headrest. The lower end portion of the support frame 43 is pushed upward in accordance with the rearward movement, and the headrest 44 moves obliquely forward and upward to approach the passenger's head to prevent a whiplash failure.
[0007]
Further, Japanese Patent Laid-Open No. 10-13881 discloses a head and head that is tilted forward and upward along an arc trajectory around a certain axis while maintaining the posture of the headrest by the movement of the pressure receiving portion in a lever / link mechanism having a parallel link mechanism. What is made to rotate is disclosed.
[0008]
[Problems to be solved by the invention]
However, in the configuration as shown in FIG. 7, the rearward movement amount of the impact pressure receiving frame 32 and the forward movement amount of the headrest 36 are such that the headrest support arm 34 centering on the pivot support 35 at the upper end of the seatback frame 31. Since the distance between the upper end of the seat back frame 31 and the headrest 36 is not long, the movement amount of the headrest 36 is not so large, and the movement locus of the headrest is forward or oblique. On the other hand, there is a problem that the head of the occupant is located at the upper part of the headrest 36 because the occupant's body is lifted obliquely upward and rearward at the time of the rear-end collision, and thus there is a limit to the effect of preventing whiplash.
[0009]
Further, in the configuration as shown in FIG. 8, the headrest 44 moves obliquely upward and forward, but since the bearing portion 42 is provided at the upper end portion of the seat back frame 41, the amount of movement of the headrest is small and the same problem. There is.
[0010]
In addition, even the headrest disclosed in Japanese Patent Laid-Open No. 10-13881 is moved obliquely upward and forward while maintaining its posture with a parallel link mechanism, but in the configuration of the lever / link mechanism, the amount of movement of the pressure receiving portion However, it is practically impossible to increase the amount of movement of the headrest, and there is a similar problem.
[0011]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide an automobile seat that has a high effect of preventing whiplash. An object of the present invention is to provide an automobile seat that can reliably prevent a whiplash injury.
[0012]
[Means for Solving the Problems]
Automobile seat of the present invention, the headrest support frame fitted with a headrest, is fixed to the upper end of the lever link mechanism mounted on the seat back frame, a pressure receiving portion which moves by receiving a load applied from the front of the seat back It is provided and connected to the lever / link mechanism. The lever / link mechanism has a lever that swings up and down around the horizontal axis in conjunction with the movement of the pressure receiving part, and a lower end pivotally supported by the lever and a headrest support frame fixed to the upper end. The first link is composed of an intermediate portion of the first link and a second link pivotally supported by the seat back frame, and the headrest support frame is pivoted forward by the above movement of the pressure receiving portion. It is configured to move along an arcuate locus obliquely forward and upward.
[0013]
According to the present invention, with respect to the movement of the pressure receiving part due to the rearward movement of the upper body of the occupant at the time of the rear-end collision, the lever link mechanism is moved obliquely forward and forward along the arcuate locus of the headrest support frame. Since the headrest moves diagonally forward and upward in combination with the rotation, the amount of movement of the headrest is increased, and the effect of preventing whiplash can be reliably obtained.
[0014]
According to the present invention, the above effect can be achieved at low cost by a lever / link mechanism having a simple structure including a lever and first and second links.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of an automobile seat of the present invention will be described with reference to FIGS.
[0016]
1 and 2, 1 is a seat cushion of an automobile seat, 2 is a seat back attached to the seat cushion 1 via an adjusting mechanism 3 so as to be reclining, and 4 is a headrest disposed on an upper portion of the seat back 2. It is.
[0017]
Reference numeral 5 denotes a seat back frame that constitutes the skeleton structure of the seat back 2, and is configured by connecting the upper and lower portions of press-molded side frames 5a on both the left and right sides with a connecting pipe material 5b. A pair of brackets 6 projecting upward are attached to both sides of the upper connecting pipe member 5b.
[0018]
The headrest support frame 7 for supporting the headrest 4 is configured by fixing a pair of support posts 7b to a horizontal molded pipe 7a, and a pair of stays suspended from the headrest 4 on an adjustment member 8 mounted on the support post 7b. 4a is inserted and the headrest 4 is attached so that height adjustment is possible.
[0019]
As shown in detail in FIG. 3, a lever / link mechanism 10 is disposed inside the side frame 5 a of the seat back frame 5, and a molded pipe 7 a of the headrest support frame 7 is formed at the upper end of the first link 11. Both ends of are integrally fixed by welding. The first link 11 is press-formed in a gentle S-shape so as to avoid interference with the upper connecting pipe material 5b, and in the middle part, similarly, avoids interference with the upper connecting pipe material 5b. One end of the second link 12 press-molded in such a gentle arc shape is connected by a pivot pin 13. The other end of the second link 12 is connected to the bracket 6 attached to the upper connecting pipe member 5b by a pivot pin 14.
[0020]
A bearing boss 15 formed with a screw hole is projected inward from the upper end of the side frame 5a of the seat back frame 5 at an appropriate distance downward. The pivot bolt 16 is fastened and fixed to the bearing boss 15. The intermediate bent portion of the L-shaped lever 17 is pivotally supported. 16a is a shaft hole through which the pivot bolt 16 passes. The horizontal lever 18 extending substantially rearward in the horizontal direction of the L-shaped lever 17 constitutes a lever of the lever / link mechanism 10, and the lower end of the first link 11 is connected to the front end (rear end) by the pivot pin 19. ing. Reference numeral 19 a denotes a pin hole formed in the horizontal lever 18.
[0021]
Further, a belt-like cloth 21 is laid across the vertical levers 20 that are suspended substantially vertically by the L-shaped levers 17 on both sides. The vertical lever 20 and the belt-like cloth 21 receive a load applied from the front surface of the seat back 2. A moving pressure receiving portion 22 is configured. In the lower part of the pressure receiving part 22, an S spring 23 is placed horizontally between the front ends of the side frames 5 a on both sides.
[0022]
A spring hook 24 is provided at an intermediate portion of the horizontal lever 18 which is a lever of the lever / link mechanism 10, and the horizontal lever is held by a tension spring 26 hung between the spring hook 25 provided at a lower position of the side frame 5a. 18 is urged to swing downward. Further, the vertical swing range of the horizontal lever 18 is restricted by stoppers 27a and 27b provided on the inner surface of the side frame 5a. Further, as shown in detail in FIG. 4, a spring built-in plunger 28 for restraining the horizontal lever 18 at the upper and lower oscillating end positions is disposed at an appropriate distance behind the bearing boss 15 on the inner surface of the side frame 5a. The horizontal lever 18 is provided with locking holes 29a and 29b into which the plunger 28 is fitted and engaged at the swing end position.
[0023]
Thus, when a load of a predetermined value or more is applied to the pressure receiving portion 22, the horizontal lever 18 abuts against the stopper 27a, and the urging force of the tension spring 26 is resisted from the position where the plunger 28 is fitted and engaged with the locking hole 29a. The plunger 28 is configured to swing upward and abut against the stopper 27b at the upper swing limit, and the plunger 28 is fitted into and engaged with the locking hole 29b and locked at that position.
[0024]
In the above configuration, in the normal state before the rear-end collision, as shown in FIG. 1, the horizontal lever 18 of the L-shaped lever 17 which is the lever of the lever / link mechanism 10 is urged by the tension spring 26 and engaged with the stopper 27a. Since the plunger 28 is engaged and locked with the locking hole 29a, the headrest 4 supported by the headrest support frame 7 fixed to the upper end of the first link 11 of the lever / link mechanism 10 is provided. Is stationary at its normal position.
[0025]
Next, when the automobile collides, the seat is impacted toward the front, and the upper body of the occupant moves backward due to the reaction, and a large load acts on the front surface of the seat back 2 toward the rear. Then, since a load of a predetermined value or more is applied to the pressure receiving portion 22 in the seat back 2 backward, the pressure receiving portion 22 swings backward, and the horizontal lever 18 of the L-shaped lever 17 is engaged with the plunger 28. It is released from the restraint caused by the engagement of the hole 29a, and swings upward against the urging force of the tension spring 26. When the horizontal lever 18 swings to a position where it abuts against the stopper 27b, the plunger 28 is engaged and engaged with the locking hole 29b, and is thus restrained again at that position.
[0026]
When the horizontal lever 18 rotates in this manner, as shown in FIG. 5, the headrest support frame 7 is pivoted so as to fall forward through the lever / link mechanism 10 in conjunction with the horizontal lever 18, and the arcuate locus is obliquely forward and upward. Is moved up so as to approach the head of the occupant M.
[0027]
The occupant's load acting backward due to the reaction of the impact at the time of the rear-end collision changes to a forward load due to the reaction and moves the occupant's body forward, while the head can follow the forward movement of the body. However, the head is swung back greatly, a shearing force acts on the neck, and a whip is injured. On the other hand, as shown in FIG. 6B, in the case of the conventional fixed headrest 4, Since the distance between the headrest 4 and the head is large, the head is greatly swung back as shown by the solid line, but in this embodiment, the headrest 4 approaches the head as shown in FIG. It is possible to reliably receive the movement of the head to the rear and protect the occupant's neck.
[0028]
Moreover, the load which acted by the reaction by the impact at the time of a rear-end collision will load the belt-like cloth 21 and the S spring 23 with a load of a predetermined value or more, and thereby the belt-like cloth 21 and the S spring 23 extend backward by the spring action. As a result, the impact energy is absorbed and the impact force on the occupant is reduced.
[0029]
When restarting by the occupant after the collision, by applying a load of a predetermined value or more to the headrest 4 from above to below, the engagement between the blanker 28 and the locking hole 29b is released, and the horizontal lever 18 is moved. By swinging downward, the horizontal lever 18 can come into contact with the stopper 27a, and the plunger 28 can be restored to the stationary position where it is engaged and engaged with the locking hole 29a.
[0030]
【The invention's effect】
According to an automobile seat of the present invention, relative to the amount of movement of the pressure receiving portion due to rearward movement of the occupant's upper body to add collision, easily and increase the forward movement of the headrest at a low cost lever-linkage, whiplash The prevention effect can be obtained with certainty.
[Brief description of the drawings]
FIG. 1 is a partially longitudinal side view of an embodiment of an automobile seat according to the present invention.
FIG. 2 is a partially longitudinal front view of the same embodiment;
FIG. 3 is a detailed perspective view of the lever link mechanism of the same embodiment;
FIG. 4 is a perspective view of the lever locking means of the embodiment;
FIG. 5 is a partially longitudinal side view showing an operation state of the embodiment.
FIG. 6 is an explanatory diagram comparing operation states of the headrest of the embodiment and the conventional example.
FIG. 7 is a side view showing an operating state of a conventional automobile seat.
FIG. 8 is a perspective view showing a schematic configuration of another conventional automobile seat.
[Explanation of symbols]
2 Seatback 4 Headrest 5 Seatback frame 7 Headrest support frame 10 Lever / link mechanism 11 First link 12 Second link 18 Horizontal lever (lever)
22 Pressure receiving part

Claims (1)

The headrest support frame with the headrest attached is fixed to the upper end of the lever / link mechanism attached to the seatback frame, and a pressure receiving part that moves under the load applied from the front of the seatback is provided to connect to the lever / link mechanism. The lever-link mechanism includes a lever that swings up and down around the horizontal axis in conjunction with the movement of the pressure receiving portion, a first link that is pivotally supported by the lever and has a headrest support frame fixed to the upper end, It consists of an intermediate portion of the first link and a second link pivotally supported by the seat back frame, and an arcuate locus extending obliquely forward and upward while rotating the headrest support frame to tilt forward by the above movement of the pressure receiving portion. It is comprised so that it may move along , The seat for motor vehicles characterized by the above-mentioned .

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