JPS5923272B2 - Manufacturing method of front seat back - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a method for manufacturing a vehicle seat.
In particular, the present invention relates to a method of manufacturing a front seat back in which a safety pad is integrally molded and is located above the rear part of the backrest to ensure the safety of rear seat passengers.

Generally, a safety pillow is installed on the front seat back of a vehicle, located above the backrest, to ensure the safety of the occupants in the event of a rear-end collision.This safety pillow is either removable or integrally formed with the backrest. etc. were selected appropriately.

However, in the event of a vehicle collision, the occupants fly forward, and the occupants in the rear seats often collide with their faces against the backrests or safety pillows of the front seats, resulting in unexpected injuries.

Therefore, in order to ensure the safety of rear seat passengers, a relatively hard pad was required to be installed at the rear of the conventional front seat backrest or at the rear of the safety pillow. Molding them in one piece requires multiple steps, the manufacturing process is complicated, and it is expensive, so in reality, it is recommended to use a method such as fixing or gluing separately molded pads. This invention was adopted as
Based on the above-mentioned requirements, a method for manufacturing a front seat back is provided, which solves the conventional drawbacks and integrally molds a safety pad located at the upper rear part of the backrest and a safety pillow at the time of molding the backrest in advance. This is what I am trying to do.

Hereinafter, the present invention will be specifically explained based on the accompanying drawings.

In the figure, reference numeral 1 denotes a front seat back which is formed by integrally molding a seat back frame 2, a backrest 3, and a rear safety pad 4, and is fixed to a seat or the like by means of attachment fittings 5 and 6. The seat back frame 2 of the seat back 1 is formed into a suitable backrest shape as shown in FIG. , a saucer T formed in advance from slab urethane or the like is fixed. As shown in FIG. 3, this receiving tray 7 has a predetermined size and volume corresponding to the safety pad 4, and is formed into a dish shape by an edge 8. In addition to the shape of the receiving tray 1 shown in FIGS. 2 and 3, its cross-sectional shape can be appropriately selected as shown in FIG. 4. That is, in Fig. 4, a is a hole made in a slab urethane, etc., and is the panel 10 in Fig. 5.
It is used in combination with a plate to serve as a plate. In case b, the upper recess of the H shape is used as a dish, and in case C, the recess of the profile shape is used as a dish. Also, this saucer 7
also serves to prevent the safety pad 4 from losing its shape.

As shown in Fig. 2 above, the seat bag frame 2 in which the tray 7 is formed is located at the upper rear of the frame placed in the casting (not shown) of the foaming line for urethane, etc. A saucer 7 is placed on the provided panel 10 with the opening facing upward, and a hard foam raw material for the safety bat 4 is placed on the saucer 7 (generally soft foam is 8 to 12K).
9JIS, and hard foam is harder than soft foam and has a hardness of up to 22k9JIS.

) 9 is experimentally poured, and a soft foam raw material for the backrest 3 is poured into a casting mold (not shown), and both foam raw materials are foamed at the same time. At this time, the hard foam raw material 9 in the tray 7 becomes gel-like, overflows from the tray 7 while foaming, and mixes appropriately with the soft foam injected for the backrest 3 shown in FIG. 5, forming the seat back 1. Ru. At this time, the edge 8 of the saucer 7 is impregnated with the hard foam material 9 while foaming, so that the saucer 7 has an appropriate hardness, which prevents the safety pad 4 from deforming and functions as a safety pad. will have the following. In short, according to the sheet manufacturing method of the present invention, molded forms having different hardnesses in the longitudinal direction within the casting mold can be easily integrally molded at the same time. For example, even if different hardnesses are required for the molded foam, such as in the backrests and safety pads of automobile seats, a tray or the like is fixed or placed in a predetermined position in advance, and the desired foam material is poured into it. It is possible to inject foam into the main body and perform integral molding at the same time as the foam molding of the main body.If foams of different hardness were injected in the same foaming line as in the past, the hard foam stock solution would flow downward. There is no complicated process such as a large number of processes, and the front seat bag can be easily molded in one piece, making it possible to manufacture an inexpensive front seat bag. In addition, a safety butt is integrally molded especially in the upper rear part of the front seat back to ensure the safety of the rear seat occupants, so the safety of the occupants can be maintained sufficiently even in the event of a vehicle collision. be.

[Brief explanation of the drawing]

FIG. 1 is a side view of a front seat bag showing an embodiment according to the present invention, FIG. 2 is a perspective view of a seat bag frame body according to the present invention, FIG. 3 is a perspective view of main parts, and FIG.
b and c are longitudinal cross-sectional views showing various embodiments of FIG. 3, and FIG. 5 is an explanatory view showing the molding state of the present invention. 1... Seat back, 2... Seat back frame, 3... Backrest, 4... Rear safety parts, 5, 6...・Mounting bracket, 7...
... saucer, 8 ... rim, 9 ... hard foam raw material, 10 ... panel.

Claims (1)

[Claims] 1. Place a seat back frame on a casting mold that forms a floating seat back for a vehicle, and place a tray made of foamable synthetic resin such as slab urethane on the frame located above the rear of the seat back. Then, the hard foam raw material is injected into the tray, and the soft foam raw material is injected into the casting mold.Then, both of the raw materials are foamed at the same time, and the hard foam raw material and the soft foam raw material overflow from the tray. and a rear safety pad molded from the hard foam raw material in the tray placement part and a backrest molded from the soft foam raw material in the normal backrest part are integrated. A method for manufacturing a front seat back, characterized in that the front seat back is formed.