JP5365076B2 - Interior parts - Google Patents

Description

  The present invention relates to interior parts such as armrests.

As an interior part, for example, Patent Document 1 described below describes a two-layer structure in which a core material and a non-woven fabric located on the skin side are provided on the inner side of the skin.
JP 2001-9951 A

  As an interior part, for example, an armrest is for stabilizing by placing an arm or for resting and relaxing the arm. Conventionally, such an armrest is stable when the arm is put on it, but it is hard, or even when it has a two-layer structure such as the interior part described above, the armrest is soft at the beginning. However, it is difficult to obtain a feeling of comfort at the stage where the human touch is high.

  Accordingly, an object of the present invention is to provide an interior part that can provide a comfortable feeling by making it difficult to feel a bottoming feeling at a stage where a human touch is high.

In the present invention, the flexible portion that can be elastically deformed when a load is applied includes a first layer on the surface side, and a second layer on the deep side that is located inside and harder than the first layer. The second layer is made harder than the first layer and changes in softness, and when the load applied to the flexible portion is 2N ± 1N, the softness due to the function of the first layer The inflection point changes so as to become soft according to the function of the hardness of the second layer .

According to the present invention, the flexible portion, the load that will be granted when the 2N ± 1N, the softness due to the function of the first layer is changed so that softness by hardness of the function of the second layer is hard Since it has an inflection point, it feels soft at the beginning of contact, then it becomes difficult to feel the bottom when the human touch is high, and it is comfortable with both softness and firmness while changing the softness It is possible to provide an interior part that can provide a feeling.

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

  FIG. 1A shows a use state of an armrest 1 for a vehicle which is an interior part according to an embodiment of the present invention, and FIG. 1B shows a combination state of materials constituting the armrest 1. It is the simplified sectional view. The armrest 1 includes a first pad layer 5 as a first layer on the surface side that is elastically deformable located inside the skin 3, and is located on the inner side of the first pad layer 5 than the first pad layer 5. A second pad layer 7 as a second layer on the deep side that can be elastically deformed is provided. That is, the first pad layer 5 and the second pad layer 7 constitute a flexible portion that can be elastically deformed when a load is applied.

  The thickness of the skin 3 is about 0.8 mm, the thickness of the first pad layer 5 is about 5 mm, and the thickness of the second pad layer 7 is about 30 mm.

  Here, as described above, the first pad layer 5 and the second pad layer 7 are different in softness (hardness), but the softness of the armrest 1 having such a substantially two-layer structure is simplified. The characteristics obtained are shown in FIG. FIG. 2 shows the reaction load against the displacement (mm) of the flat indenter when a flat indenter having a diameter of 20 mm is pressed as an arm load (N). This reaction force load corresponds to a load received from the armrest 1 when the human arm (elbow) 11 is placed on the armrest 1 as shown in FIG.

  According to FIG. 2, the armrest 1 has a soft inflection point A between 1N and 3N. That is, after the arm 11 is placed on the armrest 1, the load is softened by the function of the first pad layer 5 up to a load of, for example, about 1.8 N between 1N and 3N, and then the softness is changed by the function of the second pad layer 7. The degree increases and becomes harder.

  Here, in the process in which the arm 11 is put on the armrest 1 and the load is gradually increased as shown in FIG. 1A, the flesh of the arm 11 is compressed and becomes a state of bottoming on the bone. It became clear by the following measurements that the load was in the range of 1N to 3N.

  In other words, eight elbows (part B in Fig. 3) of typical physiques (large and small) of men and women of the ages (20's to 30's) that are assumed to have relatively high human tactile (tactile) sensitivity. As a result, it was found that the load until the meat part of the arm 11 bottoms the bone part is 2N ± 1N regardless of the height, weight, and sex. As a result, the range up to the inflection point A in the range of 1N to 3N is set to be soft when the arm 11 first touches, and the inflection point A and later are made harder.

  Until the load corresponding to the inflection point A is reached, it is a range in which the flesh of the arm 11 bottoms the bone, and in this range, the sensitivity to the softness of the armrest surface felt by humans is high (softly touched). If the load corresponding to the inflection point A is exceeded, the sensitivity to the softness becomes dull. Therefore, in the range beyond the inflection point A, the support force of the arm 11 is obtained by increasing the reaction force. That is, the armrest 1 according to the present embodiment does not simply change the softness in order to obtain a comfortable feeling, but also makes the softness and the good feeling compatible while changing the softness.

  The above measurement was performed by pressing a flat indenter having a diameter of 20 mm against the portion B in FIG. 3 at a speed of 1 mm / sec.

  FIG. 4 is a cross-sectional view showing a part of a human skin, and organs C (Merkel receptor nerves) that feel a tactile sensation are distributed on the back side of the skin. Therefore, when the meat part of the arm 11 bottoms on the bone part, these organs C are pressed and the tactile sensitivity becomes dull. The change of the human tactile sensibility is used to change the softness of the armrest 1, and at that time, it is difficult to feel the bottom feeling at the stage where the human tactile sensation is high, thereby obtaining a comfortable feeling.

  The first pad layer 5 and the second pad layer 7 constituting the armrest 1 that can provide such a feeling of comfort are made of the same material urethane and have different densities so that the softness is changed. . This change in softness can also be achieved by making the first pad layer 5 and the second pad layer 7 different materials or different structures.

  FIGS. 5 and 6 show the softness characteristics of the respective urethanes constituting the first pad layer 5 and the second pad layer 7, respectively. By combining the characteristics shown in FIGS. 5 and 6, FIG. More specific characteristics can be obtained with respect to FIG. In addition, the soft inflection point A between the loads 1N and 3N in FIG. 7 is 3N.

  The inflection point A is about 1.8N in the example of FIG. 2 and 3N in the example of FIG. 7, but if it is between 1N and 3N, the first pad layer 5 and the second pad layer 7 are used. The thickness can be set as appropriate by changing the thickness, density, material, or the like.

  FIG. 8 shows an example in which each urethane having such characteristics is used and applied to an armrest 15 which is an interior part for a vehicle provided on a door trim on the indoor side of a door 13 in an automobile.

  In this example as well, the first pad layer 19 on the skin 17 side and the second pad layer 21 located inside the first pad layer 19 are provided, as shown in FIG. Further, inside the second pad layer 21, a core material 23 made of a hard resin (for example, PP) serving as a base for supporting the first and second pad layers 19, 21 is provided.

  The second pad layer 21 is provided with, for example, a plurality of groove-like air gaps 21a extending in a direction orthogonal to the paper surface in the drawing, thereby providing an impact absorbing function from the side of the vehicle.

  As described above, according to this embodiment, when the arm 11 is placed on the armrests 1 and 15 and a load is applied, the applied load is such that the human meat part is compressed and the bone part is bottomed. When the value exceeds this value, the reaction force is set larger than before the value is exceeded. For this reason, the armrests 1 and 15 that feel soft at the beginning of contact, become less likely to feel the bottom at a stage where the human touch is high, and have a soft feeling and a good feeling of comfort are obtained. it can.

  At this time, in this embodiment, when the applied load exceeds a value at which the meat part is compressed and the bone part is in a state of bottoming, the organ C that feels tactile is compressed and the tactile sensitivity becomes dull. Sometimes, it is possible to more reliably suppress the feeling of bottoming at a high tactile sensation, and to achieve both a soft feeling and a firm feeling.

  Further, according to the present embodiment, the reaction force of the flexible portion when the applied load exceeds a value at which the human meat part is compressed and the bone part is bottomed is 2N ± 1N. By doing so, it is possible to more surely have a softness characteristic that feels soft at the beginning of contact, and then makes it difficult to feel a bottoming feeling at a stage where human touch is high.

  Further, according to the present embodiment, the first pad layers 5 and 19 and the second pad layers 7 and 21 are provided as the flexible portions that can be elastically deformed. The layers 5 and 19 and the second pad layers 7 and 21 may be joined to each other. As the armrests 1 and 15, it feels soft at the beginning of contact, and then feels difficult to feel the bottom when the human touch is high. It is possible to easily achieve the desired characteristics.

  In this case, in the present embodiment, the first pad layers 5 and 19 and the second pad layers 7 and 21 are made of the same material and have different densities. Material costs can be reduced.

(A) is explanatory drawing which shows the usage example of the armrest concerning one Embodiment of this invention, (b) is the simplified sectional drawing which shows the combination state of the raw material which comprises the armrest of (a). It is a softness | flexibility characteristic view of the armrest of FIG. It is a front view of the periphery of an elbow part which shows the site | part which measures the load until a meat part bottoms a bone part with respect to a human elbow. It is sectional drawing which shows a part of human skin. It is a softness | flexibility characteristic view of the urethane which comprises the 1st pad layer of FIG. It is a softness | flexibility characteristic view of the urethane which comprises the 2nd pad layer of FIG. It is a softness | flexibility characteristic diagram which combined each characteristic of FIG. 5 and FIG. The example which applied this invention to the armrest provided in the door trim of the motor vehicle is shown, (a) is a front view of a door, (b) is DD sectional drawing of (a).

Explanation of symbols

1,15 Armrest (interior parts)
5, 19 First pad layer (first layer, flexible part)
7, 21 Second pad layer (second layer, flexible part)
C Tactile organs

Claims (3)

An interior part having a flexible portion that can be elastically deformed when a load is applied, wherein the flexible portion is located on a surface side of the first layer and on the inner side thereof than the first layer. A second layer on the hard deep side, the second layer is made harder than the first layer to have a soft change, and when the load applied to the flexible portion is 2N ± 1N, wherein the softness due to the function of the first layer, interior parts, characterized in that it comprises an inflection point which changes so that the softness is hard by hardness of the function of the second layer. 2. The interior part according to claim 1, wherein a ratio of a displacement amount of the flexible portion to the load is large on a small load side and small on a large load side with the inflection point as a boundary. The interior part according to claim 1 or 2 , wherein the first layer and the second layer are made of the same material and have different densities.

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