JP2534907Y2 - Structure of car seat back - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention relates to the structure of a seat back, particularly of a seat for an automobile.

[Conventional technology]

Conventionally, as a structure of a seat back for an automobile, for example, a frame 1b formed into a hollow plate by blow molding using a thermoplastic synthetic resin, such as a rear seat back shown in FIGS. It is known that a coating layer such as a pad 2 and a skin 3 (only shown in FIG. 5) is coated.

[Problems to be solved by the invention]

In the structure of the conventional rear seat back, the frame 1b is formed integrally and is hard enough not to be bent by the load of the occupant, and a spring layer is generally omitted in the rear seat back. The cushion performance is determined based on only the seat pad 2. For this reason, in order to improve the cushion performance, the thickness of the seat pad 2 must be increased, and in this case, the thickness of the cushion body as a whole increases. Also, when the above-mentioned spring layer is added, the thickness of the cushion body is increased and the cost is increased.

The present invention has been made in view of such circumstances, and it is possible to improve the cushioning performance without increasing the overall thickness, and to further reduce the cost of an automobile cushion body. It is intended to provide structure.

[Means for solving the problem]

In order to achieve the above object, in claim 1, there is provided a structure of an automobile seat back having a synthetic resin frame whose inside is formed hollow by blow molding, and a coating layer covering the surface of the frame. A cut groove that penetrates the front and back sides of the frame during blow molding is formed. The frame portion was formed to be hollow and formed in a bag shape with a peripheral edge closed.

According to a second aspect of the present invention, there is provided a structure of an automobile seat back having a synthetic resin frame formed by blow molding and a coating layer covering a surface of the frame, wherein a cut groove is formed through the frame. The notch grooves are arranged such that a plurality of vertical notch grooves in a frame portion corresponding to a seat surface portion and one lateral notch groove intersecting the plurality of vertical notch grooves are continuous with each other. The frame part delimited by is formed in a bag shape that is hollow and the front end side is closed.

[Action]

According to the configuration of the first aspect, since the frame portion corresponding to the seating surface portion is divided by the notch groove so as to be cantilevered at one or both of its upper and lower portions, the frame portion is caused by the seating load of the occupant. The part is elastically deformed and bent. For this reason, the cushion performance is improved by the above-mentioned frame portion which elastically supports the occupant in addition to the covering layer, and the thickness of the entire frame is not increased.

In addition, since the portion corresponding to the seat surface section divided by the cut groove of the frame has a bag-like double structure by blow molding, it is structurally strong, and helps other reinforcing members and urging means. A good cushioning property can be obtained without any.

According to the configuration of claim 2, in addition to the function of claim 1, one or a plurality of frame portions in a cantilever support state are formed by the cut grooves.

〔Example〕

In FIG. 1, a rear seat back A is composed of a frame 1 formed of a synthetic resin, a seat pad 2 as a covering layer, and a skin (not shown). The frame 1 is formed so as to have a general shape of a rear seat back. The frame 1 includes a seat main portion (a frame portion corresponding to a seat portion) 11, a seat main side portion 12, a headrest portion 13, on both sides in the vehicle width direction. An armrest accommodating recess 14 and the like are integrally formed, and a cutout groove 15 is formed through the periphery of the seat main portion 11.

The notch groove 15 defines a pair of vertical notch grooves 151 that define both sides of the seat main portion 11 in the vehicle width direction, and an upper end portion of the seat main portion 11, and an upper end of the pair of vertical cut grooves 151. Are connected to each other, and are formed so as to be continuous with each other. Due to the cut grooves 15, both sides in the vehicle width direction and the upper side of the seat main portion 11 are separated from the front surface portion 16 of the frame 1, and the lower end portion 111 side is integrally continuous with the front surface portion 16. As a result, the seat main portion 11 stays flush with the front portion 16 when no load is applied, and the lower end portion 111 when a load is applied by a seated person.
Is supported by a cantilever so as to be elastically deformed and to bend backward.

The rear seat back A having the above structure is manufactured by first forming the frame 1, thereafter covering the front side of the frame 1 with the seat pad 2, and covering with the skin 3 (see FIG. 2). The frame 1 is formed by blow molding using a thermoplastic synthetic resin so as to have a hollow plate shape with the cut groove 15 formed therein.

In the above configuration, when a load is applied to the seat back A by the occupant in a rearward direction (see an arrow indicated by a dashed line in FIG. 2), the seat pad 2 is compressed by the load and the seat main portion 11 is moved to the lower end thereof. It will bend backward with the part 111 as a fulcrum (see the dashed line in FIG. 2). That is, the load by the occupant is supported by both the compression restoring force of the seat pad 2 and the elastic restoring force of the material of the seat main portion 11.

Thus, in this embodiment, in addition to the seat pad 2, a cushioning performance greater than the flexibility of the seat pad 2 can be obtained by the action of the restoring force based on the bending of the cantilevered seat main portion 11 in addition to the seat pad 2. Seat back (4th
5 and FIG. 5) can be improved. Moreover, the thickness of the seat back A can be kept the same as that of the conventional seat back, and the improvement of the cushion performance can be achieved without increasing the seat back thickness.

In addition, since the frame 1 can be integrally formed by blow molding, it can be easily manufactured, increase in cost can be prevented, and no increase in man-hours is caused.

 Other aspects of the above embodiment will be described below.

A. In the above embodiment, the case where the seat back is the rear seat back is shown, but the present invention is not limited to this, and the front rear seat back may be used.

B. In the above embodiment, the notch groove 15 is formed by a pair of vertical notch grooves 151 and the horizontal notch groove 1 connecting the upper ends thereof.
However, the present invention is not limited to this, and it is sufficient if the seat main portion can be partitioned so as to be in a cantilevered support state. For example, it may be constituted by a pair of vertical cut grooves 151 and a horizontal cut groove 152a connecting the lower ends thereof like a cut groove shown by 15a in FIG. 3, and a cut groove shown by 15b in FIG. As described above, a pair of vertical cut grooves 151 and a horizontal cut groove 152b connecting these intermediate portions may be used. In the latter case, two sheet main portions which are cantilevered up and down are formed.

C. In the above embodiment, a pair of vertical cut grooves is formed, but the present invention is not limited to this. For example, three or more plural cut grooves may be formed. In this case, a plurality of sheet main portions are formed. Further, the vertical cut groove and the horizontal cut groove are not limited to the linear shape, and may be formed in a bent line shape or a curved shape, for example. In this case, a sheet main portion such as a polygon or a circle is formed.

[Effect of the invention]

As described above, according to the structure of the automobile seat back of the first aspect of the present invention, the cushion performance can be improved without increasing the overall thickness by the portion divided by the cut groove, and It can be easily manufactured, and increase in cost can be suppressed.

Further, according to the configuration of the second aspect, it is possible to reliably form the portion capable of improving the cushion performance, which is the effect of the first aspect.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention, FIG. 2 is an enlarged sectional explanatory view of the cushion body taken along the line II-II of FIG. 1, and FIG. 3 is a perspective view showing another embodiment of the cut groove. , Fourth
FIG. 1 is a diagram corresponding to FIG. 1 showing the structure of a conventional cushion body, and FIG. 5 is a diagram corresponding to FIG. 2 of the conventional cushion body. 1, 1a ... frame, 2 ... seat pad, 3 ... skin,
15, 15a, 15b ... cut groove, 151 ... vertical cut groove, 152, 152a, 152b ... transverse cut groove, A ... seat back.

Claims (2)

(57) [Scope of request for utility model registration] 1. A structure of an automobile seat back having a synthetic resin frame whose interior is formed hollow by blow molding and a coating layer covering the surface of the frame, wherein the frame has front and back surfaces during blow molding. The cut groove is formed so as to partition the periphery except for one of the upper and lower portions of the frame portion corresponding to the seating surface portion, and the frame portion separated by the cut groove is hollow and has a peripheral edge. A structure of an automobile seat back characterized in that the portion is formed in a closed bag shape. 2. A structure of an automobile seat back having a synthetic resin frame having a hollow interior formed by blow molding and a coating layer covering a surface of the frame, wherein the frame has front and back surfaces during blow molding. A plurality of vertical cut grooves in the frame portion corresponding to the seating surface, and one lateral cut groove intersecting the plurality of vertical cut grooves are formed in the cut groove. And a frame portion defined by the notch groove is formed in a bag shape having a hollow and closed peripheral edge portion.