JP2000247172A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further enhance the protecting property for the lower limbs and waist of a sitting person to an impact in a front collision. SOLUTION: A sub-frame 20 is provided and supported every lateral pair of base plates 12 in such a manner that its front part can be raised, or the rear part can be lowered, and the front and rear parts of the sub-frame 20 are retained in the initial lower position and upper position by a forward movable lock plate 42 retained in the rear position, respectively. A pretensioner 54 erected and connected between the support rod 52 of the lock plate 42 and the front connecting rod 28 of the base plate 12 is towed under the input of an impact signal, and by the forward movement of the lock plate accompanied thereby, a seat cushion is forcedly rockable in backward tilting direction under the rising of the front part of the sub-frame and the lowering of the rear part thereof.

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 protection function for protecting a lower leg, a waist and the like of a seated person from an impact at the time of a forward collision.

[0002]

2. Description of the Related Art In a frontal collision of an automobile or the like (at the time of a frontal collision), the impact crushes a vehicle body from a front portion, for example, an engine room. Then, under excessive impact or the like, when the engine room or the like is compressed and deformed to, for example, the total volume of the engine and other various storage items,
Under the pressure or the like caused by the movement of the stored items, the partition plate between the passenger compartment and the engine room, the so-called toe board, located in front of the feet of the front seat occupant may protrude into the passenger compartment. is there.

[0003]

By the way, the seated person
Usually, when a danger in the front is detected, the foot tends to stab forward consciously or unconsciously.
In particular, since the driver depresses the brake pedal forward greatly at the stage of detecting the collision, the forwardly extending and rigid foot is rigidly and firmly installed between the toeboard and the seat.

[0004] Since the brake pedal is usually located in front of the driver's seat (driver's seat) at a position along the toe board, the toe board protrudes and deforms into the passenger compartment due to an excessive impact or the like at the time of a frontal collision. Therefore, there is a possibility that the brake pedal may move in the direction of the seated occupant.

[0005] However, it is not easy for a driver who stretches his knees and stretches his legs strongly to react instantly even if he feels the movement of the brake pedal in the direction of the seated person. Although protected, in some cases, it cannot be denied that the safety of the driver's lower limbs and lower back cannot be sufficiently maintained against the pressing force from the brake pedal.

As a structure for protecting against such an impact, for example, a configuration in which the waist of a seated person is elastically supported and a compressive force from a brake pedal can be absorbed under this elasticity can be considered. However, since the elastic support of the waist is negative in terms of stabilizing the sitting posture and reducing fatigue, further improvement of the protection in addition to maintaining the seating ability,
At present, it is not enough.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle seat that further enhances the protection of a lower leg, a waist and the like of a seated person against an impact at the time of a forward collision without lowering the seating property and complicating the configuration. And

[0008]

According to the present invention, at least a left and right sub-frame for fixedly supporting a seat cushion is provided for each of a pair of base plates spaced apart and arranged on the left and right. The front part of the sub-frame can be lifted with respect to this base plate via the arm part of the bell crank, and the rear part of the sub-frame can be lowered by inserting the support shaft into the downwardly extending guide hole. Possibly connected and supported respectively. The front end of the lock plate, which is attached to the base plate so as to be movable forward, is connected and pivotally connected to the crank of the bell crank so that the support shaft can be lowered from the upper part of the lower guide hole. Front position to regulate,
With the insertion of the substantially elongated lock groove, which is divided and defined into the rear position where the lowering restriction of the support shaft is released,
The support shaft at the rear of the subframe is inserted into the upper part of the descending guide hole,
Is held.

A pretensioner, which exhibits a traction operation under the input of a predetermined impact signal, is erected and connected between the lock plate and the base plate, and when the pretensioner exhibits the traction operation, the front of the lock plate is moved. At least the seat cushion is raised from the initial lower position, and the rear part is lowered from the upper position, by rotating the bell crank accompanying the movement and releasing the lowering of the support shaft at the lock groove rear position. Under this condition, it is possible to forcibly swing in the backward tilt direction.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

As shown in FIGS. 1 and 2, in a vehicle seat 10 according to the present invention, a pair of base plates 12 are provided.
The pair of left and right sub-frames extend in the front-rear direction (the left-right direction in FIG. 1) and are juxtaposed to the left and right, and fixedly support the seat cushion 18 via the brackets 14 and 15.
20 are attached to the left and right base frames, respectively.

As shown in FIG. 1, in the embodiment of the present invention, a seat (vehicle seat) 10 has a seat slide device 26 that supports a runner 22 slidably with respect to a guide rail 24, that is, a so-called seat slide device 26. An upwardly extending portion integral with the runner is embodied as a slide sheet, and is defined as a base plate 12 on each of the left and right sides.

The structure of the seat slide device 26 is well-known, and its basic structure and structure are not the purpose of the present invention, and will not be described in detail here.

Although the upwardly extending portion of the runner 22 is defined as the base plate 12 here, it is sufficient if the base plate and the runner have an integral structure capable of integrally moving (sliding). Instead, for example, a configuration may be adopted in which a separate base plate is integrally fixed to the runner by welding or the like.

As shown in FIGS. 1 and 2, the front portions of the left and right base plates 12 are integrally connected together, for example, with a pipe-shaped front connecting rod 28 erected and fixed. Then, for example, left and right subframes 20 connected between the rear portions by erection and fixing of the rear connecting rod 30 are attached to the base plate at positions inside the base plate 12, respectively.

Here, in the embodiment of the present invention, a substantially rectangular bell crank 32 is disposed at the front of the base plate 12 and is pivotally connected thereto, and a vertically extending guide hole 34 extending vertically is supported. It is formed at the rear of the base plate so that the extension end 30a of the rear connecting rod 30 serving as a shaft can be inserted. The front part can be raised under the connection of the bell crank 32 to the arm part 32a, and the rear part can be lowered under the insertion of the support shaft (extended end) 30a into the descent guide hole 34. The sub-frame 20 is supported and connected to the base plate 12.

The pivot locus of the arm portion 32a of the bell crank about a fulcrum, for example, a pivot pin 36, and the support shaft 3
The deviation from the swing trajectory of the front portion of the sub-frame 20 around 0a is achieved, for example, by making the insertion hole 40 on the sub-frame side into which the connecting pin 38 of the arm portion is inserted into an elongated hole extending in the front-rear direction. Guaranteed.

In the present invention, the lock plate 42 is attached to and supported by the base plate 12 so as to be able to move forward with respect to the base plate 12, for example, through the insertion of the elongated forward guide hole 46 with the guide pin 44. Its front end is connected and pivotally connected to the crank portion 32b of the bell crank via a connecting pin 48.

Reference numeral 49 in FIGS. 1 and 2 designates a regulating hole for defining a rotation range of the bell crank 32. For example, a fulcrum (pivot) is provided so that the extension end 48a of the connecting pin 48 can be inserted. The pin 36 is formed in the base plate 12 as an arc-shaped long hole centered on the pin 36.

The forward guide hole 46 is provided with a lock plate.
42 are formed in corresponding lengths so that the forward movement amount can be defined.

Here, the lock plate 42 has a rear portion at a front position 50a for restricting the lowering of the support shaft 32a from above the lowering guide hole 34 and a rear position 50b for releasing the lowering of the support shaft. It has a substantially slot-shaped lock groove 50 that is divided and defined. As the shape of the lock groove 50, for example,
A substantially rectangular shape formed by a combination of a front portion 50a extending substantially in the horizontal direction and a rear portion 50b extending rearward and obliquely downward can be exemplified. And in this invention,
The support shaft 30a at the rear of the subframe is positioned at the front position 5 of the lock groove.
It is inserted and held in the upper part of the descending guide hole 34 with the insertion into 0a.

In the embodiment of the present invention,
Between the left and right lock plates 42, for example, a pipe-like support rod 52 is erected and fixed. 1 and 2
As shown in FIG. 5, in the present invention, the pretensioner 54 exhibiting the traction operation under the input of the predetermined impact signal is provided between the front connecting rod 28 and the support rod 52, that is, between the base plate 12 and the lock plate 42. Erection,
Are linked.

As can be seen from FIG. 3 (A) in addition to FIGS. 1 and 2, the pretensioner 54 is slidable in the axial direction within the cylinder 58 defined inside the main body 56 thereof. And a movable body 64 extending from the piston to the outside of the main body via a sealing end of the cylinder, that is, a sealing body 62 sealing the cylinder opening.
Then, a towing operation of pulling the movable body 64 into the main body 56 by a predetermined starting operation with respect to the piston 60, that is, a towing operation of towing the support rod 52 forward, is presented under the input of a predetermined impact signal, This pretensioner 54 is configured.

In this embodiment, the movable body
64 is formed of a flexible member such as a wire, and the terminal 64a is wound around the support member 5 so that the support rod 5
2, and the pretensioner body 56 is fixed to the front connecting rod 28,
A pivot 66 is pivotally attached to the protruding bracket 66. And thus, the main body 56, and the movable body
By rotatably connecting the 64 to the front connecting rod 28 and the support rod 52, the rotation of the pretensioner 54 with respect to each rod during the towing operation is ensured.

Here, the activation operation of the pretensioner 54 can be exemplified by an explosion of a drug.
For example, as shown in FIG. 3A, in this type of pretensioner 54, a piston 60 and a sealing body (sealing end) 62
Is defined as a traction-side chamber 58a of the cylinder 58, and a medicine 54 such as an inflating agent is built in the traction-side chamber,
For example, a priming device 72 which is charged and ignites under the input of an impact signal is arranged in the traction-side chamber.

As a source of an impact signal for performing the ignition operation of the detonator 72, for example, an impact sensor (not shown) of an airbag device mounted on a steering wheel or the like of an automobile can be used.

In such a pretensioner 54, when the detonator 72 performs an ignition operation based on an input signal from an impact sensor, the generated gas 74 accompanying the explosion of the chemical 70 is generated.
The expansion of the traction side chamber 58a by the
Moves in the towing direction as shown in FIG. 3B, that is, to the left in the figure. FIG. 3 (A) accompanying the piston 60
The moving operation of the movable piece 64 from the extended position of FIG. 3 to the towing position of FIG. 3B is a towing operation of the pretensioner 54,
By transmitting and applying this towing operation to the support rod 52, the locking plate 42 can be towed forward (to the left in FIG. 1).

Reference numerals 76 in FIGS. 3A and 3B denote exhaust holes for discharging and exhausting the surplus of the generated gas 74 to the cylinder 58 and eventually to the outside of the main body 56. As shown in B), the pretensioner 54 is configured to prevent the piston, and hence the movable body 64, from being excessively moved by aligning this exhaust hole with the traction side chamber 58a after the movement of the piston 60.

FIG. 1 shows the initial state of the sheet 10. In this initial state, the movable body 64 of the pretensioner 54 is in the extended position, and the front portion of the sub-frame 20 is held in the lower position by the rearward holding of the lock plate 42 accompanying the extended state of the pretensioner, With the support shaft 30a aligned with the lock groove front position 50a, the support shaft, and eventually the rear portion of the subframe, is held above the descending guide hole 34 (see FIG. 3A). When a forward collision (front collision) of the automobile occurs in such an initial state, the pretensioner 54 performs a predetermined traction operation by input of an impact signal from an impact sensor or the like and explosion of the medicine 70 caused by the input. (See FIG. 3 (B)).

In the present invention, the pretensioner 54
Is the front connecting rod 28 of the base plate 12
When the pretensioner performs a towing operation, the support rod, and thus the lock plate, move forward with respect to the base plate and the sub-frame 20 when the pretensioner exhibits a towing operation. Then, as shown in FIG. 4, the sub-frame 2 is raised by pushing up the arm portion 32a of the bell crank accompanying the forward movement of the lock plate 42.
0 is lifted upwards, and the supporting shaft with the alignment of the locking groove rear portion 50b with the supporting shaft 30a accompanying it.
With the release of the lowering regulation of 30a, the rear part of the sub-frame is lowered to the lower part of the lowering guide hole. That is, when an impact such as a front collision occurs, the seat cushion 18 is forcibly rocked in the backward tilt direction under the rise of the front part and the fall of the rear part.

As described above, when the seat cushion 18 is swung in the rearward tilting direction with the front part being raised and the rear part being lowered, the angle of the thigh of the occupant, for example, the driver, is adjusted together with the seat cushion. Because it fluctuates in the tilt direction, the knees of the seated person who thrust under the depression of the brake pedal, etc.
It can be lifted naturally from its stretched position. The swing of the seat cushion 18 under the towing operation of the pretensioner 54 is rapid, and the resilience of the seat pad is added to the sudden swing, so that the driver's knee is
This knee lift raises the driver's foot away from the brake pedal, as it can be lifted instantly rather than simply lifted. Even if the driver does not completely separate, the driver's lower limb can be easily bent by raising the knee under the backward inclination of the seat cushion 18. Even if you move in the seated direction,
The power can be absorbed under the bending of the lower limbs.

In other words, in the event of a front collision, even if the driver squeezes his foot under the brake pedal, the squeezed state can be easily released.
Impact and load input from the toe board to the driver's lower limb, lower back, etc. can be sufficiently suppressed. Therefore, according to the seat 10, it is possible to ensure higher protection of the driver's lower limb, waist and the like in frontal collision and the like.

Since the waist and the like of the driver are not supported under great elasticity, the seating posture is not hindered and the fatigue is not hindered. Therefore, it is possible to sufficiently maintain both the seating property and the high protection property.

Further, the front portion of the sub-frame 20 is connected to and supported by the base plate 12 such that the front portion of the sub-frame 20 can be moved up and the rear portion thereof can be moved down. , Respectively, and the support rod of the lock plate
52 and front connecting rod 28 on base plate
It is enough to install a pretensioner 54 between
There is no complication of the configuration.

In the present invention, since the front portion of the sub-frame 20 is supported by the bell crank arm portion 32a, the amount of rise of the lock plate 42 relative to the amount of forward movement can be sufficiently large. Therefore, the front portion of the seat cushion 18 can be easily lifted and the seat cushion can be easily tilted backward without complicating the configuration.

Further, in the seat 10 of the present invention, since the seat cushion 18 is swung in the backward tilt direction, the forward movement of the buttocks at the time of a front collision or the like is reliably prevented. That is, since so-called slippage at the time of a frontal collision can be prevented, the protection of the occupant and the reliability of the protection are further enhanced from this point.

In the embodiment of the present invention,
The seat cushion 18 is embodied as being capable of tilting backward.
However, the sub-frame to which the seat cushion 18 is fixed
The reclining base (20) can also be used as a mounting member of a reclining device (not shown) for swingably supporting the seat back 78 in the front-rear direction, that is, a so-called reclining base. Under this condition, the seat back is also integrally inclined backward with the seat cushion (see FIGS. 1 and 4).

As described above, if the seat cushion 18 and the seat back 78 are integrally tilted backward, the upper body of the driver is also tilted backward together with the thighs, so that the driver does not have to force his / her posture. Can be obtained. Therefore, also from this point, the protection against the occupant can be sufficiently improved.

Here, in the embodiment of the present invention, the lock groove 50 is embodied in a substantially rectangular shape.
A front position 50a that regulates the lowering of the inserted support shaft 30a,
The shape is not limited to this, as long as the shape is formed by a combination with the rear position 50b capable of canceling the lowering restriction.
Lock grooves may be formed.

In the embodiment of the present invention,
Lower the extension end 30a of the rear connecting rod into the guide hole 3
4, and as a support shaft inserted into the lock groove 50. However, the support shaft need only be a pin-shaped body integrally protruded from the sub-frame 20, and is not limited to this. For example, a separate pin may be protruded from the sub-frame.

However, as in this embodiment,
Rear connecting rod 30 between left and right subframes 20
In the configuration in which the rear connecting rod is installed and fixed, the use of the extended end 30a of the rear connecting rod as a support shaft can prevent an increase in the number of components and a complicated configuration.

As can be seen from FIG. 2, in this embodiment, the lock plate 42 is interposed and arranged between the base plate 12 and the sub-frame 20.
However, the present invention is not limited to this. For example, a base plate
A configuration in which the lock plate 42 is arranged outside the 12 may be adopted.

Further, in the embodiment of the present invention,
The movable body 64 of the pretensioner is illustrated as a flexible member such as a wire. However, since it is sufficient to transmit and apply the traction force due to the movement of the piston 60 to the support rod 52 and eventually the lock plate 42, the present invention is not limited to this.For example, a rigid rod may be incorporated into the pretensioner 54 as the movable body 64. Good.

In the above-described embodiment,
The activation operation of the pretensioner 54 is illustrated by an explosion of a drug. However, pretensioner 54
The pre-tensioner is not limited to this as long as it has a configuration in which a traction operation is performed under an impact signal from an impact sensor or the like. For example, the pre-tensioner can perform a traction operation under a biasing force of a compression coil spring or the like. May be configured.

In the present invention, a driver seat of an automobile or the like is exemplified as a seat. However, the present invention is not limited to this. The present invention is applicable to other seats of an automobile, such as an assistant seat (passenger seat) and a rear seat. May be applied.

The present invention is not limited to the seats of automobiles, but may be applied to other seats such as trains, airplanes and ships.

The embodiments described above are for explaining the present invention, and do not limit the present invention in any way. All the modifications and alterations within the technical scope of the present invention are also included in this embodiment. It goes without saying that it is included in the invention.

[0048]

As described above, according to the vehicle seat of the present invention, the seat cushion is swung in the rearward tilt direction with the front portion being raised at the time of a front collision or the like. Lifting or flipping the knee releases the occupant's leg tension and allows the occupant's lower limbs to bend easily, even if not completely released. In other words, in the event of a front collision, even if the seated person stretches his or her leg, the stretched state can be easily released, so that the impact and load input from the toe board to the seated person's lower limb, waist, etc. are sufficiently suppressed. it can. Therefore, according to this seat, it is possible to ensure higher protection of the lower limb, the waist, etc. of the seated person in the case of a front collision.

Since the waist and the like of the seated person are not supported under great elasticity, there is no hindrance to stabilizing the seated posture and reducing fatigue. Therefore, it is possible to sufficiently maintain both the seating property and the high protection property.

Further, the front portion of the sub-frame is connected to and supported by the base plate so that the front portion of the sub-frame can be moved up and the rear portion thereof can be moved down. And a pretensioner is erected between the lock plate and the base plate, so that the configuration is not complicated.

Since the front portion of the subframe is supported by the arm portion of the bell crank, the amount of rise of the lock plate with respect to the amount of forward movement can be sufficiently large. Therefore, it is easy to tilt the seat cushion backward to raise the front portion of the seat cushion greatly without complicating the configuration,
And it is surely obtained.

Further, if the sub frame is formed in a shape that can also serve as a reclining base to which the reclining device is fixed, and the seat back is connected to the sub frame via the reclining device attached to the sub frame, the seat cushion can be provided. As a result, the seat back is also integrally inclined backward. Thus, the seat cushion,
If the seat back is integrally tilted backward, the upper body of the driver is also tilted backward together with the thigh, so that the knee can be jumped up without forcing the driver to take an unreasonable posture. Therefore, also from this point, the protection against the occupant can be sufficiently improved.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of a vehicle seat according to the present invention in an initial state.

FIG. 2 is a partial schematic perspective view of a vehicle seat.

FIG. 3 is a schematic longitudinal sectional view of a pretensioner in a vehicle seat in an initial state and after operation.

FIG. 4 is a schematic longitudinal sectional view of the vehicle seat after operation.

[Explanation of symbols]

 10 Vehicle seat 12 Base plate 18 Seat cushion 20 Subframe 30a Rear connecting rod extension end (support shaft) 32 Bell crank 34 Lowering guide hole 42 Lock plate 50 Lock groove 54 Pretensioner

Claims (3)

[Claims] 1. A left and right sub-frame for fixedly supporting at least a seat cushion is provided for each of a pair of base plates spaced apart and arranged on the left and right sides, and a front portion of the sub-frame is opposed to the base plate by an arm portion of a bell crank. , And the rear of the subframe is connected and supported so as to be able to descend under the insertion of a support shaft into a downwardly extending guide hole extending downward, and is movable forward with respect to the base plate. A front end portion of the attached and supported lock plate is connected and pivotally connected to the crank portion of the bell crank so as to be interlocked therewith, and regulates a lowering of the support shaft from above the lowering guide hole; A rear position where the lowering of the shaft is released, and an insertion of the substantially elongated lock groove, which is divided into two parts, into the front position. A pretensioner, which is inserted and held above the descending guide hole and exhibits a towing operation under the input of a predetermined impact signal, is erected and connected between the lock plate and the base plate, and the pretensioner exhibits the towing operation. At this time, at least the seat cushion is moved by the rotation of the bell crank accompanying the forward movement of the lock plate, and the release of the lowering of the support shaft at the lock groove rear position.
A vehicle seat capable of forcibly swinging in the backward tilt direction when the front portion of the sub-frame rises from an initial lower position and the rear portion descends from an upper position. 2. A left and right sub-frame for fixedly supporting at least a seat cushion is provided for each of a pair of base plates spaced apart and arranged on the left and right, and a front portion of the sub-frame can be raised with respect to this base plate. The rear part can be lowered and connected, respectively supported, and attached to the base plate so as to be able to move forward, and the lock frame supported by the sub-frame front part, the rear part is in the initial lower position, and the upper position, A pretensioner, which is respectively held and exhibits a traction operation under the input of a predetermined impact signal, is erected and connected between the lock plate and the base plate, and the lock plate is moved forward by the traction operation of the pretensioner, At least raise the seat cushion from the initial lower position, Forcibly pivotable backward tilting direction under the subsequent part of the descent of the fine upper position and the vehicle seat. 3. The sub-frame has a shape that can also serve as a reclining base to which the reclining device is fixed, and the seat back is connected to and supported by the sub-frame via the reclining device attached to the sub-frame. The vehicle seat according to claim 1.