JP2002248981A - Automobile seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automobile seat, which securely controls the forward moving of an occupant upon a sudden deceleration of the car without deteriorating the comfotableness in the car, and is light and inexpensive with a simple constitution. SOLUTION: Inside of the front of a seat cushion 1, a receiving part 4 is arranged in the way that its axial center extends in the longitudinal direction, the receiving part having an overall shape of almost hollow and cylindrical, and being able to deform flexibly in its elasticity in the direction perpendicular to the axial center. When the occupant sits on the seat cushion 1, the receiving part deforms flexibly in flat, not deteriorating the sitting feeling of the occupant. When the buttocks of the occupant is about to move forward upon sudden deceleration, the receiving part 4, having the hollow, cylindrical shape with a high stiffness in the longitudinal direction, receives the buttocks, so that the forward moving of the occupant is controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat and, more particularly, to a vehicle seat that reliably prevents an occupant from moving forward when the vehicle suddenly decelerates.

[0002]

2. Description of the Related Art Conventionally, a seatbelt is provided as a means for preventing a passenger from moving forward due to inertia when a vehicle suddenly decelerates, but the butt portion of the passenger sinks into a seat cushion. However, there is a problem that it may not work effectively while moving forward. Referring to FIG. 5, the occupant 30 is properly seated on the seat 31 as shown in FIG.
In the case of a frontal collision with the occupant, the occupant 30 moves forward while sinking as shown in (b) due to the inertial force, and when the deceleration becomes maximum, as shown in (c). As described above, the butt portion of the occupant 30 moves greatly to the front end while sinking in the seat cushion 31.

In order to prevent the butt portion of the occupant 30 from moving in front of the seat cushion 31, as shown in FIG. It has been proposed that a cross member 33 such as a pipe is provided so as to be located at a position across the width of the seat cushion 31 so as to absorb shock and suppress forward movement.

However, if the cross member 33 such as a pipe is disposed at the front of the seat cushion 31, the occupant 30 will have a poor sitting comfort, and will have a problem in that the driving comfort will be impaired. If the position of the cross member 33 is lowered to the position, there is a problem that the effect of preventing the occupant 30 from moving forward cannot be obtained.

[0005] Therefore, as shown in FIG.
Is arranged at a low position, and in the event of a collision, a driving means 35 such as an inflator is activated as shown in FIG. 3B so that the cross member 33 is lifted upward through interlocking means 34 such as a link mechanism as appropriate. Has been proposed. This type of technical means is disclosed, for example, in Japanese Patent Laid-Open No. 5-23829.
No. 7, JP-A-7-81466 and the like,
Japanese Utility Model Laid-Open Publication No. 7-5898 discloses a structure in which a front portion of a seat cushion itself is lifted at the time of a collision.

The present applicant has previously filed Japanese Patent Application No. 2000-38.
In No. 402, a receiving member extending in the left-right direction is disposed inside the seat cushion so as to be vertically movable by a guide, and means for biasing the receiving member upward is provided, and a load is applied from above. When the receiving member moves smoothly downward, and when a load is applied from behind, the receiving member engages with the front side edge of the guide to prevent downward movement, and is received by the receiving member. The proposed configuration is proposed.

[0007]

However, in the configuration shown in FIG. 7 and the configuration disclosed in each of the above publications, a mechanism for forcibly lifting the cross member 33 when required and its driving means 34 and 35 are provided. Since it is necessary, there is a problem that the apparatus becomes complicated and cost increases, and the weight becomes heavy.

On the other hand, the structure disclosed in Japanese Patent Application No. 2000-38402 has a simple structure and is not bad in sitting comfort. There is a possibility that the receiving member may escape downward due to the downward component of the load, and there is a problem that the effect of preventing the occupant from moving forward can not be stably obtained.

The present invention has been made in consideration of the above-described conventional problems, and can surely prevent the occupant from moving forward when the vehicle suddenly decelerates without deteriorating the sitting comfort, and has a simple, lightweight, and inexpensive structure. It is an object of the present invention to provide a vehicle seat that can be configured as follows.

[0010]

SUMMARY OF THE INVENTION An automobile seat according to the present invention is formed in a front portion of a seat cushion so as to have a substantially hollow cylindrical shape as a whole and to be elastically deformable and deformable in a direction perpendicular to an axis. The receiving portion is disposed with its axis centered in the front-rear direction. Here, the substantially hollow cylindrical shape includes a shape in which the entire shape is cylindrical and self-supporting even if there is a missing portion in the circumferential direction and the circuit does not completely rotate.

According to this structure, when the occupant is seated on the seat cushion, a pressing force acts on the receiving portion from above, so that the receiving portion is easily elastically bent and deformed and becomes flat. The comfort is not degraded, and if the occupant's buttocks try to move forward during sudden deceleration, the hollow cylindrical receiving part is difficult to deform in the axial direction, so the buttocks are the receiving parts. Therefore, the occupant can be reliably prevented from moving forward, and the push-up mechanism and the driving means are not separately provided, so that the configuration is simple, light and inexpensive.

The receiving portion is connected to the six plate-like members by five parallel hinges, and the plate-like members at both ends are fixed to members inside the seat cushion at an interval from each other in an outward posture. And, by providing an urging means for urging the two central plate-like members to approach each other and a stopper portion for preventing the central plate-like members from approaching a certain amount or more, the plate-like member having high rigidity is connected in the front-rear direction. High rigidity is obtained, and the upper two central plate-like bodies are inclined downward from the center toward both sides, so that the occupant's feeling of foreign objects on the thighs can be reduced,
Further, the shape of the receiving portion can be stabilized by the stopper portion, and the buttocks can be reliably supported.

A plurality of the receiving portions may be arranged in the width direction of the seat cushion. However, if the receiving portions are arranged at the central portion in the width direction of the seat cushion, the receiving portion may be placed between the thighs of the occupant in a seated state. Since the receiving part is located, the descending amount of the receiving part is small, and if the buttocks try to move forward during sudden deceleration,
Since the pelvis is reliably received by the receiving portion, the forward movement of the buttocks can be more stably suppressed.

[0014]

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 cushion for an automobile seat, and seat rails (not shown) on both left and right sides.
It is mounted on the floor so that the front and rear positions can be adjusted. 2 is a steel frame portion of the seat cushion 1,
A cushion pad (not shown) such as urethane foam is mounted on the upper part thereof, and the outer surface thereof is further covered with an exterior material (not shown). An outer peripheral portion of the frame portion 2 is provided with a peripheral embankment portion 2a which is formed by bulging upward, and the cushion pad is formed so as to be fitted to the inner and outer peripheral surfaces thereof.

At the front central portion of the space 3 in the peripheral levee portion 2a of the frame portion 2, there is provided a receiving portion having a substantially hollow cylindrical shape as a whole and capable of being elastically bent and deformed in a direction perpendicular to the axis. The stop portion 4 is disposed with its axis centered in the front-rear direction.
The cushion pad (not shown) has a recess for accommodating the receiving portion 4.

As shown in FIGS. 2 and 3, the receiving portion 4 of the present embodiment is constituted by connecting six plate-like members 5a to 5f in series by five parallel hinges 6a to 6e. I have. Of the six connected plate members 5a to 5f, plate members 5 at both ends
a and 5f are fixed to the frame portion 2 of the seat cushion 1 at an appropriate distance from each other in an outward posture. 7
Are mounting holes provided in these plate-like bodies 5a and 5f. Each of the hinges 6a to 6e is configured by inserting a hinge pin 9 into a ring portion 8 formed so as to be fitted alternately on the same axis at the connection end portions of the plate-like members 5a to 5f.

At both ends in the front-rear direction of the two central plate-like members 5c, 5d, a triangular shape which engages each other so that the plate-like members 5c, 5d form a certain angle and do not approach each other. Tension springs 11 as urging means for urging the two plate-like bodies 5c and 5d closer to each other are formed by bending stopper portions 10a and 10b having a shape.
Are stretched between the hinge pins 9 of the outer hinges 6b and 6d of the plate-like bodies 5c and 5d. The receiving portion 4 is self-standing with a hollow cylindrical shape having a pentagonal cross section as a whole by the stopper portions 10a and 10b and the tension spring 11. The urging means is not limited to the tension spring 11 but may be a suitable hinge 6.
A torsion spring may be provided at a to 6e.

According to the above configuration, when the occupant sits on the seat cushion 1 of the vehicle seat or when the occupant operates the pedal, as shown in FIG. 1, the pressing force F ₁ is lowered through the cushion pad. Is added, and the cushion pad is displaced downward while being compressed. At this time, the receiving portion 4 elastically bends from the state of FIG. 4A to the flat state easily against the urging force of the tension spring 11, as shown in FIG. Because it deforms, the occupant feels uncomfortable,
There is no worse sitting comfort. In particular, one receiving portion 4 is disposed at the center of the seat cushion 1 in the width direction, and two plate-like members 5 forming an upper portion of the receiving portion 4 are provided.
Since c and 5d are inclined downward from the center toward both sides, there is no foreign object feeling on the thigh of the occupant, and the sitting comfort is good.

On the other hand, a sudden deceleration occurs due to the frontal collision of the car,
When the occupant's bottom tries to move forward,
Against it so that the pressing force F ₂ applied from the rear, since the receiving portion 4 maintains its hollow cylindrical shape as shown in (a) of FIG. 4, a high stiffness in the longitudinal direction And the buttocks are received by the receiving portion 4. Particularly, since the cross-sectional shape of the receiving portion 4 is stabilized by the stopper portions 10a and 10b and the tension spring 11, the butt portion of the occupant can be reliably supported. Moreover, even if there is downward force component in the pressing force F ₂ applied to the receiving portion 4, the receiving unit 4 produces a further deformation to the tubular shape is regulated by the main direction of the pressing force F ₂ There is no possibility that the receiving portion 4 easily escapes downward. In this manner, the forward movement of the occupant is received by the receiving portion 4, and the forward moving energy of the occupant is absorbed by the elastic deformation of the receiving portion 4, whereby the amount of forward movement is suppressed.

Further, according to the above-described structure, since the push-up mechanism and the driving means as in the conventional example are not separately provided, the structure can be made simple, light and inexpensive.

In the description of the above embodiment, the receiving portion 4
Is shown as an example in which six plate-like members 5a to 5f are connected by hinges 6a to 6e by hinge pins 9, but each plate-like member is formed by an integral molded product of synthetic resin connected by integral hinges. May be.

Further, in the above-described embodiment, the example in which the receiving portion 4 is constituted by the six plate-like members 5a to 5f has been described, but the overall shape is substantially hollow cylindrical and is perpendicular to the axis. Any configuration can be adopted as long as the configuration can be elastically deformed.

[0024]

According to the automobile seat of the present invention, as described above, the entire shape of the front portion of the seat cushion is substantially hollow cylindrical and elastically deformable in a direction orthogonal to the axis. The receiving portion is arranged with its axis centered in the front-rear direction, so that when the occupant sits on the seat cushion, the receiving portion is easily elastically deformed and deformed and becomes flat, so that the seating comfort is improved. If the occupant's buttocks move forward during rapid deceleration, the buttocks are received by the hollow cylindrical receiving portion, so that the occupants can be reliably prevented from moving forward. In addition, since the push-up mechanism and the driving means are not separately provided, the configuration is simple, light, and inexpensive.

Further, the receiving portion is connected to six plate-like members by five parallel hinges, and it is assumed that the central two plate-like members are biased so as to come closer to each other, and the urging means is approached by a certain amount or more. When the stopper is provided with a stopper for blocking, high rigidity is obtained in the front-rear direction by connecting the rigid plate-like members, and the two central plate-like members located above are downwardly moved from the center toward both sides. Therefore, the occupant's feeling of a foreign object on the thigh can be reduced, and the shape of the receiving portion can be stabilized by the stopper, so that the buttocks can be reliably supported.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of a vehicle seat according to the present invention.

FIG. 2 is a perspective view of a receiving portion of the embodiment.

FIG. 3 is an exploded perspective view of a receiving portion of the embodiment.

FIG. 4 is an explanatory diagram of the operation of the receiving unit of the embodiment.

FIG. 5 is an explanatory diagram of a behavior of an occupant at the time of sudden deceleration in an automobile seat.

FIG. 6 is an explanatory view of a conventional means for preventing a passenger from moving forward during sudden deceleration.

FIG. 7 is an operation explanatory view of another conventional example of a vehicle seat provided with a means for preventing an occupant from moving forward during sudden deceleration.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seat cushion 2 Frame part 4 Receiving part 5a-5f Plate 6a-6e Hinge 10a, 10b Stopper part 11 Tension spring (biasing means)

Claims (2)

[Claims] 1. A receiving portion having a substantially hollow cylindrical shape and elastically deformable and deformable in a direction perpendicular to an axis in a front portion of a seat cushion. An automotive seat characterized by being arranged toward the vehicle. 2. The receiving portion connects the six plate-like members by five parallel hinges, and fixes the plate-like members at both ends to members inside the seat cushion with an interval therebetween in an outward posture. 2. The vehicle seat according to claim 1, further comprising an urging means for urging the two central plate members so as to approach each other and a stopper portion for preventing the central plate members from approaching a certain amount or more. .