JP2005170144A - Head rest for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a head rest for a vehicle capable of positively protecting the head and the neck of an occupant while having such a simple structure that it can be simply and auxiliarily mounted to various kinds of seat backs. <P>SOLUTION: When the head of the occupant M is rapidly rearwardly moved as reaction when the vehicle receives a rear-end collision, a skin layer pad 3B constituted by a low impact resilience pad material softly receives the head of the occupant, and a core pad 3C constituted of a high impact resilience pad material suppresses the sink of the head of the occupant M and rebounds/moves frontward the head of the occupant M. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vehicle headrest attached to a seat back of a vehicle seat.

  In general, a seatrest for a vehicle seat is provided with a headrest that protects the occupant's head and neck by receiving a sudden rearward movement of the occupant's head when the vehicle undergoes a rear-end collision. . This type of vehicle headrest is usually structured such that a pad material made of urethane foam or the like having a low coefficient of restitution is covered with a skin material so as to reduce the repulsive force applied to the occupant's head.

Further, as this type of vehicle headrest, a headrest is also known that is configured to suppress a rapid rearward movement of a passenger's head. This headrest is made up of a flexible bag filled with liquid so that when the fluid pressure in the bag rises when pressed by the occupant's head, the liquid in the bag is gradually discharged. It is comprised (refer patent document 1).
JP 2002-283902 A (paragraph 0018, FIG. 2, FIG. 3)

  In this type of vehicle headrest, a headrest stay for attaching to the upper portion of the seat back is attached to the headrest of the driver seat or the passenger seat. This headrest stay is usually constructed by bending a pipe material or the like into a gate shape, with the left and right lower ends protruding from the lower part of the headrest, and the upper part that is the middle part embedded in the headrest and fixed. Has been.

  By the way, the headrest described in Patent Document 1, which is composed of a flexible bag body in which a liquid is sealed, is considered to be able to sufficiently reduce whipping damage to the occupant's neck, but on the other hand, Requires a flow path for gradually discharging the liquid and means for opening and closing the flow path, and the structure is complicated, and cannot be easily attached to various seat backs having different shapes and sizes. There is a problem.

  Furthermore, the headrest stay constructed by bending the pipe material into a gate shape is easy to change due to the spring back of the pipe material at the left and right lower end parts, so the support on the seat back side through which the lower end part is inserted There is also a problem that a large sliding resistance is generated between the members and a large operating force is required when adjusting the height position of the headrest.

  SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a vehicle headrest that can reliably protect the head and neck of an occupant while having a simple structure that can be easily attached to various seat backs. To do.

  A vehicle headrest according to the present invention is a headrest attached to a seat back of a vehicle seat, and includes a surface layer pad covered with an outer skin and a core pad surrounded by the surface layer pad. The core pad is made of a high-repulsion pad material having a low coefficient of restitution, and the core pad is made of a high-resilience pad material having a high coefficient of restitution.

  In the vehicle headrest according to the present invention, when the head of the occupant suddenly moves backward due to the reaction when the vehicle undergoes a rear-end collision, the surface layer pad made of the low-rebound pad material softly receives the occupant's head. The core pad made of the high repulsion pad material suppresses the sinking of the occupant's head and moves the occupant's head to the front.

  In the vehicle headrest of the present invention, low-rebound urethane foam can be used as the low-repulsion pad material, and hard urethane foam can be used as the high-repulsion pad material.

  Further, when the vehicle headrest of the present invention has a headrest stay for mounting on the seat back, the upper portion of the headrest stay can be structured to be held and fixed by a core pad. In this case, if the headrest stay is divided into left and right parts, it is easy to adjust the pitch interval between the left and right lower end portions of the headrest stay that is inserted and fixed to the support member on the seat back side to a specified value. preferable.

  According to the vehicle headrest according to the present invention, when the head of the occupant suddenly moves backward due to the reaction when the vehicle undergoes a rear-end collision, the surface layer pad made of the low-repulsion pad material covers the occupant's head. The core pad, which is softly received and made of high-rebound pad material, suppresses the sinking of the occupant's head and moves the occupant's head in a repulsive direction, thus protecting the occupant's head and neck reliably. Can do.

  Further, the vehicle headrest of the present invention has a simple structure including a surface layer pad covered with an outer skin and a core pad surrounded by the surface layer pad, and thus can be easily attached to various seat backs. .

  Embodiments of a vehicle headrest according to the present invention will be described below with reference to the drawings. In the drawings to be referred to, FIG. 1 is a perspective view schematically showing a support structure for a vehicle headrest according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the headrest shown in FIG.

  A vehicle headrest according to an embodiment is a headrest 3 attached to a seatback 2 of a vehicle seat including a seat cushion 1 and a seatback 2 as shown in FIG. The headrest stays 4 and 4 are mounted so as to be adjustable in height.

  In the seat back 2, a seat back frame 5 (only the upper structure is shown) is embedded in a seat back pad (not shown) made of a cushion material such as urethane foam. The upper part of the seat back frame 5 is composed of an upper pipe 6 bent in a gate shape when viewed from the front, and a pair of left and right headrest support brackets 7, 7 are provided on the front surface of the horizontal pipe portion 6 A extending in the left-right direction. Are welded. In the headrest support brackets 7 and 7, cylindrical headrest supports 8 and 8 made of synthetic resin for inserting and supporting the headrest stays 4 and 4 are incorporated.

  Here, as shown in FIG. 2, the headrest 3 includes a surface layer pad 3B covered with a skin 3A and a core pad 3C surrounded by the surface layer pad 3B. The skin 3A is made of an appropriate material such as genuine leather, synthetic leather, and fabric, and the surface pad 3B is made of a low-rebound urethane foam that is a low-rebound pad material having a low rebound coefficient. And the core pad 3C is comprised with the hard urethane foam which is a high resilience pad material with a high resilience coefficient.

  On the other hand, as shown in FIG. 1, the pair of left and right headrest stays 4 and 4 are made of a pipe material formed so that the upper end portions 4A and 4A are bent in an L shape and face each other. The headrest stays 4 and 4 divided into left and right in this way are insert-molded when molding the rigid urethane foam constituting the core pad 3C, so that the upper part including the upper end portions 4A and 4A is held by the core pad 3C. Is fixed. The lower end portions 4B and 4B of the headrest stays 4 and 4 are held at a predetermined pitch interval without being affected by the springback.

  In the vehicle headrest of the embodiment configured as described above, the headrest 3 is in a normal driving posture in which the occupant M is seated on the seat cushion 1 and leans against the seat back 2 as shown in FIG. In order not to inadvertently come into contact with the head of the occupant M, the occupant M is disposed slightly rearward from the head.

  Here, when the vehicle receives a rear-end collision in a normal driving state as shown in FIG. 3, the head of the occupant M suddenly moves backward due to the reaction. At that time, as shown in FIG. 4, the surface layer pad 3 </ b> B made of a low-rebound urethane foam, which is a low-repulsion pad material having a low restitution coefficient, softly receives and protects the head of the occupant M while elastically deforming. Then, the core pad 3C made of hard urethane foam, which is a high rebound pad material having a high coefficient of restitution, suppresses the sinking of the head of the occupant M and moves the occupant M's head to the front, Reduce M cervix lashing disorder.

  Thus, according to the vehicle headrest of one embodiment, when the vehicle receives a rear-end collision and the head of the occupant suddenly moves backward due to the reaction, the surface layer pad 3B softly receives the occupant M's head, Since the lead pad 3C repels and moves the head of the occupant M forward to reduce whipping damage to the neck of the occupant M, the head and neck of the occupant M can be reliably protected.

  In addition, the vehicle headrest according to the embodiment has a simple structure including a surface layer pad 3B covered with the skin 3A and a core pad 3C surrounded by the surface layer pad 3B. Can be attached.

  Further, since the upper portion including the upper end portions 4A and 4A of the headrest stays 4 and 4 divided into the left and right is held and fixed by the core pad 3C, the lower end portions 4B and 4B of the headrest stays 4 and 4 are spring-backed. It can be released from the influence of the above and can be held at a predetermined pitch interval. As a result, it is possible to reduce the sliding resistance when the lower end portions 4B, 4B of the headrest stays 4, 4 are inserted into the headrest supports 8, 8 in the headrest support brackets 7, 7 on the seat back 2 side. The height can be adjusted with a light force.

  As an example, an impact test was conducted on a headrest having the same structure as the headrest 3 shown in FIG. 2, and the relationship between the deflection of the headrest and the rebound acceleration (G) was measured and obtained. In addition, as a comparative example, an impact test was performed on a headrest of a conventional example in which the surface pad 3B and the core pad 3C shown in FIG. 2 are made of a low-resilience urethane foam similar to the surface layer 3B. The relationship between the amount of deflection and the rebound acceleration (G) was determined by measurement.

  The measurement results are as shown in the graph of FIG. 5. In the comparative example, the rebound acceleration was about 13 G even when the headrest deflection amount reached about 75 mm. However, in the example, the deflection amount was about 40 mm and the rebound acceleration was 20 G. Turned out to reach the degree.

  In other words, the headrest of the comparative example shows that the forward rebound acceleration is slow and the repulsion acceleration is small, while the headrest of the embodiment has a fast forward rebound acceleration and a large repulsion acceleration. did. According to the headrest of the embodiment having such characteristics, when the head of the occupant suddenly moves backward due to the reaction when the vehicle undergoes a rear-end collision, the occupant's head quickly sinks after being submerged shallowly. It was confirmed that the lashing disorder of the occupant's neck can be mitigated because it repels forward.

It is a perspective view showing the outline of the support structure to the seat back of the headrest for vehicles concerning one embodiment of the present invention. It is a longitudinal cross-sectional view of the headrest shown in FIG. FIG. 2 is a side view of the vehicle seat shown in FIG. 1 taken as a longitudinal section and showing the posture of a passenger seated on the vehicle seat during normal operation. It is a side view which shows the effect | action of a posture change and a headrest when the vehicle of the passenger | crew who seated on the vehicle seat shown in FIG. It is a graph which shows the relationship between the deflection amount of the headrest of the Example by an impact test, and a comparative example, and the repulsion acceleration ahead.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat cushion 2 Seat back 3 Headrest 3A Skin 3B Surface pad 3C Core pad 4 Headrest stay 4A Upper end 4B Lower end 5 Seat back frame 6 Upper pipe 7 Headrest support bracket 8 Headrest support 9 Headrest support M Crew

Claims (4)

A headrest attached to a seat back of a vehicle seat,
A surface layer pad covered with an outer skin and a core pad surrounded by the surface layer pad,
The surface layer pad is made of a low rebound pad material having a low coefficient of restitution,
The vehicular headrest is characterized in that the core pad is made of a high rebound pad material having a high coefficient of restitution.   2. The vehicle headrest according to claim 1, wherein the low resilience pad material is a low resilience urethane foam, and the high resilience pad material is a rigid urethane foam.   3. The vehicle headrest according to claim 1, further comprising a headrest stay for mounting on the seat back, wherein an upper portion of the headrest stay is held and fixed by the core pad.   The vehicle headrest according to claim 3, wherein the headrest stay is divided into left and right parts.

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