JP2015080976A - Headrest structure of vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a headrest structure of a vehicle seat, capable of improving energy absorption effect by providing an attenuation effect with a simple structure, without causing a problem such as rising of a production cost.SOLUTION: In configuring a headrest of a vehicle seat, an impact force absorbing body 10 which is blow-molded is included in the headrest 4. The impact force absorbing body 10 includes a groove part 10d into which a headrest stay 5 is inserted, and a fragile part 10e which is easily deformed when an impact force is applied with a head of a passenger. At the groove part 10d of the impact force absorbing body 10, a communication hole 10f is formed which communicates with an internal cavity of the headrest stay 5 through a ventilation hole 5c formed at the headrest stay 5.

Description

  The present invention relates to a headrest structure for a vehicle seat attached to a seat back via a headrest stay made of a hollow bar-like material.

  In an automobile, a structure that reduces a load acting on the head of an occupant at the time of a vehicle collision is employed. For example, Patent Document 1 discloses a structure in which an impact load is absorbed by dividing a headrest into a front part and a rear part by blow molding and making the thickness of the front part thinner than that of the rear part. Further, Patent Document 2 includes a first bag body in which fluid is filled in a headrest, and a second bag body in which the fluid of the first bag body flows through an orifice when an impact load is applied. Is disclosed.

Japanese Utility Model Publication No. 58-80053 JP 2013-173471 A

  By the way, in the structure of the said patent document 1, although the deformation | transformation with respect to an impact load can be made easy by making thin the thickness of the headrest front part by a blow molded product, it is the structure where the air in a headrest front part does not escape. There is a concern that the attenuation effect is difficult to obtain and the energy absorption effect is reduced accordingly.

  On the other hand, in the structure of Patent Document 2, although the damping effect can be obtained by the orifice, there is a problem in that a complicated structure in which a plurality of bags are arranged in the headrest increases production cost.

  The present invention has been made in view of the above-described conventional situation, and can reduce the energy absorption effect by obtaining a damping effect with a simple structure without causing a problem such as an increase in production cost. The challenge is to provide a structure.

The present invention is a vehicle seat headrest structure attached to a seat back via a hollow headrest stay,
A blow molded impact force absorber is included in the headrest, and the impact force absorber is easily deformed when an impact force is applied by a groove portion in which the headrest stay is fitted and an occupant's head. The groove portion of the impact force absorber is formed with a communication hole communicating with the internal cavity of the headrest stay through an air vent hole formed in the headrest stay. It is said.

  According to the headrest structure of the present invention, when the impact force at the time of vehicle collision acts on the headrest from the head of the occupant, the fragile portion of the impact force absorber is deformed to absorb the initial load, and subsequently the impact force absorption. When the body is compressed and deformed, the air in the shock absorbing body flows into the headrest stay through the communication hole. At this time, the communication hole functions as an orifice, so that a damping force is generated and the remaining collision energy is absorbed, thereby reducing the collision load on the occupant's head.

  Thus, in the present invention, an impact force absorber by blow molding is provided in the headrest, and a groove portion in which the headrest stay is fitted to the impact force absorber and a fragile portion that is easily deformable with respect to the impact force is formed. Since the communication hole that communicates with the internal cavity through the air vent hole of the headrest stay is formed in the groove, an excellent energy absorption effect can be obtained with a simple structure, and when a plurality of conventional bags are provided Compared to the production cost.

  Further, since the impact force absorber is formed by blow molding, the manufacturing cost and weight of the entire headrest can be reduced.

  Further, since the air vent hole is formed in the headrest stay, the headrest stay is easily deformed from the air vent hole with respect to a large impact force, and the energy absorption effect can be enhanced also from this point.

It is a front view of the headrest of the vehicle seat by Example 1 of the present invention. FIG. 2 is a cross-sectional side view of the headrest (a cross-sectional view taken along line II-II in FIG. 1). It is a cross-sectional side view which shows the effect | action with respect to the impact force of the said headrest. It is a principal part enlarged view of the said headrest (circle enlarged view of FIG. 3). It is sectional drawing (VV sectional view taken on the line of FIG. 3) of the said headrest. It is a perspective view of the sheet.

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

  1 to 6 are views for explaining a headrest structure of a vehicle seat according to a first embodiment of the present invention. In this embodiment, the terms front and rear and left and right mean front and rear and left and right as viewed in the forward direction of the vehicle.

  In the figure, reference numeral 1 denotes a seat disposed in a driver's seat, a passenger seat or a rear seat of an automobile. The seat 1 includes a seat cushion 2 on which an occupant sits, a seat back 3 that supports the back of the occupant, and a headrest 4 that supports the head of the occupant.

  The headrest 4 has a structure in which a cushion material 4 a made of soft urethane or the like is covered with an outer skin 4 b and is attached to the seatback 3 via a headrest stay 5.

  The headrest stay 5 is formed by bending a metal hollow round bar so as to form a substantially U-shape, and includes a horizontal portion 5a and left and right leg portions 5b extending downward following the horizontal portion 5a. 5b, and lower end openings 5d of the left and right leg portions 5b are open to the outside.

  The left and right leg portions 5b of the headrest stay 5 are supported by a pair of support brackets 8 and 8 attached to the frame member 7 of the seat back 3 so that the height can be adjusted.

  The headrest 4 includes an impact force absorber 10 formed by blow molding. The impact force absorber 10 has an outer peripheral surface surrounded by the cushion material 4a, and has a hollow bag shape sealed by joining the outer peripheral edge portions 10c of the front side member 10a and the rear side member 10b. It is formed to make.

  The rear member 10b of the impact force absorber 10 is formed with a groove portion 10d having a shape and size into which the horizontal portion 5a of the headrest stay 5 and the upper end portions of the left and right leg portions 5b are fitted. The headrest 4 is supported by fitting the headrest stay 5 into the groove 10d.

  The front member 10a of the impact force absorber 10 is formed with a fragile portion 10e that is easily deformable when an impact force is applied by the head of the occupant. This weak part 10e has a circular bellows structure. Here, the fragile portion is not limited to the bellows structure, and may be formed by, for example, a thin portion or a notch portion.

  An air vent hole 5c is formed in each of the horizontal part 5a and the left and right leg parts 5b fitted in the groove part 10d of the headrest stay 5.

  A small-diameter communication hole 10f that communicates with the internal cavity of the headrest stay 5 through the air escape hole 5c is substantially coaxial with the desired portion of each air escape hole 5c of the groove 10d of the impact force absorbing member 10. It is formed as follows.

  When the impact force at the time of a vehicle rear impact acts on the headrest 4 from the head of the occupant, the initial impact energy is absorbed by the deformation of the fragile portion 10e of the impact force absorber 10 (see FIG. 3). When an impact force is further applied, the impact force absorber 10 is compressed and deformed, so that the air in the impact force absorber 10 (see the arrows in FIGS. 4 and 5) flows from the communication hole 10f to the air vent hole of the headrest stay 5. It flows into the internal cavity of the headrest stay 5 through 5c and is discharged to the outside through the lower end opening 5d. At this time, the communication hole 10f functions as an orifice, so that a damping force is generated, and the remaining middle- and late-stage collision energy is absorbed, thereby reducing the load on the head and neck of the occupant.

  As described above, according to this embodiment, the impact force absorber 10 formed by blow molding is provided in the headrest 4, and the groove portion 10d in which the headrest stay 5 is fitted to the impact force absorber 10 and the impact force. On the other hand, the weakly deformable portion 10e is formed, and the communication hole 10f communicating with the internal cavity is formed in the groove portion 10d through the air vent hole 5c of the headrest stay 5, so as described above, with a simple structure An excellent energy absorption effect can be obtained, and the production cost can be reduced as compared with the case where a plurality of conventional bags are provided.

  Further, since the impact force absorber 10 is formed by blow molding, the manufacturing cost and weight of the entire headrest can be reduced.

  Further, in the present embodiment, since the plurality of air vent holes 5c are formed in the headrest stay 5, the headrest stay 5 is easily deformed from the air vent hole 5c with respect to a large impact force. The effect can be enhanced.

  Here, when the headrest of the present embodiment is a both lique type and active type having a large coefficient of restitution, the rebound characteristics can be reduced, and therefore, the effect can be particularly exerted.

DESCRIPTION OF SYMBOLS 1 Seat 3 Seat back 4 Headrest 5 Headrest stay 5c Air escape hole 10 Impact force absorber 10d Groove part 10e Fragile part 10f Communication hole

Claims (1)

A vehicle seat headrest structure attached to a seat back via a hollow headrest stay,
In the headrest, a blow molded impact force absorber is included,
The impact force absorber has a groove portion in which the headrest stay is fitted, and a fragile portion that is easily deformed when an impact force is applied by the head of the occupant,
A headrest structure for a vehicle seat, wherein a communication hole communicating with an internal cavity of the headrest stay is formed in the groove portion of the impact force absorber through an air vent hole formed in the headrest stay. .

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