JP5021826B1 - Automotive seat - Google Patents

Abstract

An object of the present invention is to receive an occupant's head early and reliably to greatly reduce whiplash.
An automobile seat 1 includes a main frame 5 having a backrest portion 3 connected to the seat portion 2 and having a headrest 4 at an upper end 6, and a front swing position in which the upper end is separated from the main frame 5. A subframe 8 supported so as to be able to swing back and forth between a swing position on the rear side approaching the main frame 5 and a biasing means 15 for elastically biasing the subframe 8 to a swing position on the front side. And comprising.
[Selection] Figure 1

Description

  The present invention relates to an automobile seat that is applied to a seat of an automobile and reduces the impact received by an occupant when receiving a rear-end collision from a succeeding vehicle, thereby greatly reducing whiplash.

  2. Description of the Related Art Conventionally, as a seat for reducing the impact due to a rear-end collision, a seat that reduces the impact during the rear-end collision by optimizing the hardness of the sheet material and the arrangement of the springs is known.

However, in such a rear-end collision, the car ahead will receive the collision energy of the following vehicle at the time of the rear-end collision, so the damaged front car will move forward, and at this time it will sit in the front car seat. The occupants who were present were left behind a little as the car moved forward, and were forced to sink in the seat back.
Therefore, the occupant's head cannot be restrained, S-shaped deformation and backward bending of the cervical spine occur, and whiplash is considered to occur. By simply optimizing the hardness of the sheet material and the spring arrangement, Whiplash could not be significantly reduced.

  Therefore, in Patent Document 1, an intermediate portion is connected to a seat back of a seat, a seat back frame fixed to the seat, and a pivot support pipe provided at an upper end of the seat back frame, and a headrest is fixed to the upper end. An invention comprising a swing frame is disclosed. According to this, when the vehicle collides, the occupant enters the seat back, so that the swing frame rotates and the headrest is displaced forward. By receiving the head of the occupant with the headrest displaced forward, it is possible to significantly reduce whiplash.

JP 2004-148942 A

  However, in the seat back of the above-mentioned Patent Document 1, the headrest is displaced by the rotation of the swing frame, so that there is a possibility that the head of the occupant cannot be stably received. Further, since the swing frame is directly subjected to the impact at the time of the rear-end collision, there is a possibility that the collision energy cannot be sufficiently absorbed, and the number of parts is greatly increased, leading to an increase in cost.

  Therefore, the present invention is to provide an automobile seat that has a simple structure and can quickly and reliably receive the head of an occupant and can greatly reduce whiplash.

In order to achieve the above object, an invention according to claim 1 is an automobile seat comprising a seat portion and a backrest portion connected to the rear of the seat portion, and a headrest is provided at an upper end of the backrest portion. There,
A main frame in which the backrest portion is connected to the seat portion and the headrest is provided at an upper end; a front swing position where the upper end moves away from the main frame; and a rear swing position approaching the main frame. and the sub-frame is swingably supported to the back and forth between, Ri name and a biasing means for resiliently biasing the sub-frame to swing position of the front side, in the main frame, the sub The intermediate part of the frame is rotatably connected, and stoppers are provided on the upper and lower parts of the main frame to regulate the swing positions of the front and rear sides of the sub frame, respectively. It is characterized by being able to move.

The invention according to claim 2 is characterized in that, in addition to the invention according to claim 1 , shock absorbing means in the front-rear direction is provided inside the subframe.

According to a third aspect of the present invention, in addition to the first aspect of the invention, the biasing means is provided at a connecting portion between the main frame and the subframe, one end being the main frame and the other end being It is a torsion coil spring that is respectively engaged with the sub-frame.

According to a fourth aspect of the present invention, in addition to the first or second aspect of the present invention, the biasing means is a compression coil spring interposed between the main frame and the subframe on the upper end side of the subframe. It is characterized by being.

According to a fifth aspect of the present invention, in addition to the first aspect of the invention, the urging means is provided between the main frame and the sub frame below the connecting portion between the main frame and the sub frame. It is a tension coil spring stretched between them.

According to a sixth aspect of the present invention, in addition to the first aspect of the invention, the biasing means is provided at a connecting portion between the main frame and the subframe, one end of the main frame and the other end of the main frame. It is a spiral spring which latches to each of the sub-frames.

The invention described in claim 7, in addition to the invention of claim 1 or 2, said biasing means, said provided in the longitudinal direction to the intermediate portion of the main frame, pivotable link front and rear ends in the vertical The plate is formed by a tension coil spring that is stretched between the rear end of the link plate and the main frame and presses the front end of the link plate against the sub frame.

According to the first aspect of the present invention, the head of the occupant can be reliably restrained by the headrest at an early stage by swinging the subframe, so that it is possible to significantly reduce whiplash. In addition, the main frame receives the collision energy and swings to the rear swing position, so the collision energy can be absorbed in two stages between the subframe and the main frame, and as a backrest part. The strength can be secured by the main frame, and the cost can be reduced. Further, the swinging of the subframe forward and backward can be realized with a simple configuration.

According to the second aspect of the present invention, it is possible to absorb the collision energy directly and effectively in the subframe by adopting the impact absorbing means.

According to the inventions described in claims 3 to 7 , the urging means can be manufactured with a small number of parts at low cost, and can be applied to a wide variety of vehicle types.

It is explanatory drawing which shows the whole structure of the vehicle seat. (A) shows the structure of a backrest part, (b) is a cross-sectional enlarged view which shows a cross section. (A) shows a state in which the subframe swings forward, and (b) is an explanatory view showing a state in which the subframe swings backward. (A)-(c) is explanatory drawing which shows the example of a change of an impact-absorbing means. (A) shows the example of a change of a biasing means, (b) is a cross-sectional enlarged view which shows the cross section which used the compression coil spring for the biasing means. (A) shows the example of a change of a biasing means, (b) is a cross-sectional enlarged view which shows the cross section which used the tension coil spring for the biasing means. (A) shows the example of a change of a biasing means, (b) is a cross-sectional enlarged view which shows sectional drawing which used the spiral spring for the biasing means. (A) shows the example of a change of a biasing means, (b) is a cross-sectional enlarged view which shows the cross section which used the tension coil spring for the biasing means.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, as shown in FIG. 1, an automobile seat 1 of the present invention is provided in an automobile and is used by an occupant, and is often used in a front driver's seat and a passenger seat. However, the present invention does not specify the position in the vehicle as long as it is an automobile seat having a backrest. In the figure, only the internal mechanism is shown, and cushion pads such as urethane and an outer cover are omitted.

The vehicle seat 1 includes a seat portion 2 and a backrest portion 3 connected to the back of the seat portion 2, and a headrest 4 is provided on the upper end 6 of the backrest portion 3 via brackets 13 and 13. .
Among them, the backrest portion 3 is connected to the seat portion 2 and, as shown in FIG. 2A, the main frame 5 in which the headrest 4 is provided at the upper end 6 via the brackets 13 and 13, and the upper end is the main frame. A sub-frame 8 supported so as to be able to swing back and forth between a front swing position that moves forward from 5 and a rear swing position that approaches the main frame 5, and the sub frame 8 is moved to the front swing position. And an urging means 15 for urging elastically.

Next, as shown in FIG. 2A, the main frame 5 has an inverted U-shaped pipe composed of an upper end 6 and lower ends 7, 7. Side plates 12, 12 formed by bending a plate material into an L shape are attached.
The sub-frame 8 is formed by bending a pipe into a substantially square shape, and hinge plates 14 and 14 are provided so as to project rearward inside the intermediate portion 9 of the sub-frame 8. A mesh sheet 11 as an impact supply means is stretched inside the subframe 8.

  In addition, as disclosed in Japanese Patent No. 3400409, the mesh sheet 11 is provided with a recess corresponding to the shape of the subframe 8, and is stretched on the subframe 8 in a mold having a cooling device. Cover the mesh sheet that has been cut larger than the area, apply tension to the mesh sheet, clamp the mesh sheet to the mold from four sides, and form a melted thermoplastic resin coating on the subframe 8. The sub-frame 8 on which the coating is formed is fitted into the concave portion of the mold from above the mesh sheet while the coating is clamped, and then the coating is infiltrated into the mesh sheet, and then the coating is solidified by a cooling device. ing. Thereby, the mesh sheet 11 can be directly stretched on the subframe 8, and the durability of the mesh sheet 11 after stretching is also good. In addition, since it is possible to ensure the feeling when seated only by the tension of the mesh sheet 11, urethane and the like can be reduced, and air permeability is improved.

  On the other hand, mounting shafts 18 project from the opposing surfaces of the side plates 12, 12 in the main frame 5, and pass through the hinge plates 14, 14 of the subframe 8, thereby attaching the subframe 8 to the mounting shaft. It is connected so that it can swing back and forth around 18. Between the side plates 12 and 12 of the main frame 5, a wire stopper 17 for restricting the swing position of the front side of the subframe 8 is installed, and between the lower ends 7 and 7 of the pipe, the rear side of the subframe 8 is provided. Stoppers 10 and 10 for restricting the swing position are provided.

The biasing means 15 is externally mounted on a mounting shaft 18 penetrating the hinge plate 14, and is a torsion coil spring 16 that engages one end with the hinge plate 14 and the other end with the side plate 12. Reference numeral 19 denotes a bolt for fixing the subframe 8 to the mounting shaft 18.
Therefore, the subframe 8 that is swingably connected to the main frame 5 is urged to rotate in the direction of the arrow shown in FIG. 3A by the torsion coil spring 16.

  Using the automobile seat 1 configured as described above, mitigation of whiplash when receiving a rear-end collision from a following vehicle is performed as follows.

First, in a normal use state, the subframe 8 is held at the front swing position where the lower end abuts against the wire stopper 17 as shown in FIG. This rocking position does not change even if a passenger sits down.
Next, when the following vehicle collides with the vehicle, the vehicle ahead receives the collision energy of the subsequent vehicle at the time of the collision, so that the damaged vehicle moves further forward. As a result, the occupant is left behind with respect to the operation of the vehicle, and is pushed backward so that the upper body sinks into the backrest 3. Therefore, a force larger than the urging force of the torsion coil spring 16 is applied to the subframe 8, and the subframe 8 rotates around the mounting shaft 18 in the direction of the arrow as shown in FIG. Swing to the swing position.

  Therefore, the upper body of the occupant also swings backward together with the subframe 8, and the head comes into contact with the headrest 4 at an early stage and is reliably restrained, so that the whiplash can be greatly reduced. In particular, in the subframe 8, since the mesh sheet 11 stretched on the inside can absorb the impact as a whole, the subframe 8 can be reliably swung backward regardless of the seating posture of the occupant, the physique difference, The variation in the whiplash reduction effect is reduced.

  As described above, the vehicle seat 1 of the present invention includes a main frame 5 in which the backrest 3 is connected to the seat 2 and the headrest 4 is provided at the upper end 6, and the front side where the upper end is separated from the main frame 5 forward. A subframe 8 supported so as to be able to swing back and forth between a swing position and a rear swing position approaching the main frame 5, and elastically urges the subframe 8 to the front swing position. By including the urging means 15, the head of the occupant can be reliably restrained by the headrest 4 at an early stage by swinging the sub-frame 8, and it is possible to significantly reduce whiplash. . In addition, since the main frame 5 receives the collision energy and swings to the rear swing position, the main frame 5 can absorb the collision energy in two stages. The strength of the backrest portion 3 can be secured by the main frame 5 and the cost can be reduced.

  In addition, the intermediate portion 9 of the subframe 8 is rotatably connected to the main frame 5, and stoppers 10, 10 for restricting the swing position of the front side of the subframe 8 are provided on the upper portion 6 of the main frame 5. In addition, the wire stoppers 17 for restricting the swinging position of the rear side of the subframe 8 are respectively provided so that the subframe 8 can swing back and forth, so that the subframe 8 swings back and forth. This can be realized with a simple configuration.

In addition, the configuration of the automobile seat 1 of the present invention is not limited to the aspect of the embodiment described above, so long as it restrains the occupant's head at an early stage and significantly reduces whiplash, The present invention can be changed as necessary without departing from the spirit of the present invention.
For example, the shock absorbing means does not necessarily have a configuration in which the mesh sheet 11 is provided on the inner side of the subframe 8, and two wires 56 and 56 are provided on the inner side of the subframe 8 as shown in FIG. It is good also as a structure which stretched in the left-right direction at predetermined intervals up and down, and fixed to the front side of the wires 56 and 56 the U-shaped panel 57 which the both right and left ends expand. In this case, the upper body of the occupant can be received by the panel 57, and the holdability is improved.

Further, as shown in FIG. 4B, two S springs 58, 58 are stretched in the left-right direction at a predetermined interval in the vertical direction inside the subframe 8, and a panel is placed on the front side of the S springs 58, 58. 59 may be fixed. The portion of the S spring 58 located on the back surface of the panel 59 is linear.
Further, as shown in FIG. 4 (c), a plurality (three in this case) of S springs 58, 58 may be extended in the left-right direction at predetermined intervals in the vertical direction inside the subframe 8. .
Even in such an impact absorbing means employing the S spring, the collision energy can be efficiently transmitted to the subframe 8 by the elasticity of the S spring. Also, the feeling when sitting is good.

On the other hand, the biasing means 15 can be changed as appropriate. Each modification example will be described below.
FIG. 5 shows a pair of urging means 15 between the base brackets 21, 21 provided at the upper end of the sub-frame 8 and a U-shaped back panel 22 laid in the left-right direction in the main frame 5. The compression coil springs 20 and 20 are interposed in the front-rear direction, and the sub frame 8 is urged to the front swing position by the repulsive force of the compression coil springs 20 and 20. With this structure, the biasing means can be easily formed with a small number of parts.

  FIG. 6 shows locking pieces 27, 27 provided on a cross pipe 25 laid between the side plates 12, 12 on the lower side of the mounting shaft 18 that is a connecting portion between the main frame 5 and the subframe 8. A pair of tension coil springs 26, 26 as urging means 15 are stretched between the locking pieces 28, 28 provided at the lower end of the sub frame 8, and the sub coil 8 is pulled by the tensile force of the tension coil springs 26, 26. The frame 8 is biased to the front swing position. With this structure, since no other structure is interposed between the upper end of the subframe 8 and the main frame 5, there is an advantage that the degree of freedom of setting the swing range of the subframe 8 is higher than in the case of FIG. is there.

  In FIG. 7, a spiral spring 35 having a central end connected to the mounting shaft 18 is wound around the mounting shaft 18 of the main frame 5 and the subframe 8, and the outer end of the spiral spring 35 is The sub-frame 8 is urged to rotate to the front swing position by being engaged with the pin 37 of the engagement plate 36 provided on the frame 8. With this structure, the biasing means such as the spiral spring 35 can be compactly formed in the vicinity of the mounting shaft 18.

In FIG. 8, the link plate 41 is attached to the left and right intermediate portions 44 of the main frame 5 by a shaft 42 projecting inward so that the front and rear ends can swing up and down, and the rear end of the link plate 41 and the main frame 5 The tension coil springs 40 are respectively stretched between the locking pieces 43, 43 provided at the upper end of the frame, and the link plate 41 is rotationally biased by the tensile force of the tension coil springs 40, 40, and the subframe is formed at the front end thereof. 8 is pushed forward and biased to the front swing position.
Also in these modified examples, the urging means can be manufactured at a low cost with a small number of parts, and can be applied to a wide range of vehicle types.

  In the above embodiment, the intermediate portion of the sub-frame is rotatably connected to the main frame to swing the sub-frame back and forth, but the lower end of the sub-frame is rotatably connected to the lower end of the main frame and the seat portion. Then, it can be swung back and forth.

  1 .... Automobile seat 2 .... Seat part 3 .... Backrest part 4 .... Headrest 5 ... Main frame 6 ... Upper part 7 ... Lower part 8 ... Sub frame 9 ... Intermediate Part 10 ·· stopper, 11 · · mesh sheet, 12 · · side plate, 13 · · bracket, 14 · · hinge plate, 15 · · biasing means, 16 · · torsion coil spring, 17 · · wire stopper, 18 .. Mounting shaft, 19 .. Bolt, 20 .. Compression coil spring, 21 .. Base bracket, 22 .. Back panel, 25 .. Cross pipe, 26 .. Tension coil spring, 27. Locking piece, 35 ... spiral spring, 36 ... locking plate, 37 pin, 40 ... tension coil spring, 41 ... link plate, 42 ... shaft, 43 ... locking piece, 44 ... intermediate part , 56 ... Ya, 57 ... panel, 58 ·· S spring, 59 ... panel.

Claims (7)

A seat for an automobile comprising a seat part and a backrest part connected to the back of the seat part, wherein a headrest is provided at the upper end of the backrest part,
A main frame in which the backrest portion is connected to the seat portion and the headrest is provided at the upper end; and the sub-frame is swingably supported to the back and forth between, Ri name and a biasing means for biasing the sub-frame resiliently to swing position of the front,
The intermediate portion of the subframe is rotatably connected to the main frame, and stoppers are provided on the upper and lower portions of the main frame to regulate the front and rear swing positions of the subframe, respectively. An automotive seat characterized in that the sub-frame can be swung back and forth . 2. The automobile seat according to claim 1 , wherein shock absorbing means in the front-rear direction is provided inside the subframe. The biasing means is a torsion coil spring provided at a connecting portion between the main frame and the sub frame, one end of which is engaged with the main frame and the other end of the main frame and the sub frame. automotive sheet according to 1. The automobile seat according to claim 1 or 2 , wherein the biasing means is a compression coil spring interposed between the main frame and the sub frame on an upper end side of the sub frame. Said biasing means in claim 1, wherein a tension spring stretched between the main frame and the main frame at the lower side of the connecting portion between the sub-frame and the sub-frame The automotive seat as described. The urging means is a spiral spring provided at a connecting portion between the main frame and the sub frame, one end being locked to the main frame and the other end being locked to the sub frame. automotive sheet according to 1. The biasing means is provided in the front-rear direction to an intermediate part of the main frame, and the front and rear ends are swingable up and down, and is stretched between the rear end of the link plate and the main frame. automobile seat according to claim 1 or 2, characterized in that the front end of the link plate is formed with a tension coil spring to be pressed against the sub-frame.

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