JPH0866270A - Cushion body for automobile seat back and its manufacture - Google Patents

Abstract

PURPOSE: To provide the cushion body for automobile seat back in which the fitting of an insert for back rest part is simplified, the insert can be made common, any breaking or the like is not generated in the case of manufacturing the cushion body and the feeling of riding is improved as well. CONSTITUTION: In a cushion body 10 for automobile seat back for which a back rest part 11 is integrally molded by foaming with a head rest part 12 at the upper part of the part 11, the back rest part is provided with a bag part 14, whose downside is opened at the upper part of the rear side and a flange part 15 extended from the lower part of the bag part 14 is internally provided on both the sides of the rear side. Besides, in the head rest part, a main body part 22 of a head rest insert is embedded, and a stay 23 of the head rest insert is protruded from the head rest part to the bag part of the back rest part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cushioning body for a vehicle seat back, which has good moldability and is easy to attach a backrest insert, and a method for manufacturing the cushioning body.

[0002]

2. Description of the Related Art Some seat backs for automobiles are so-called high back type in which a backrest portion and a headrest portion are integrally formed. This high-back type seat back is composed of a seat back cushion body and an insert disposed inside or on the back side of the cushion body, and the surface thereof is covered with a skin material such as synthetic or natural leather or cloth if desired. It is being appreciated. The insert is generally a pipe frame with a spring stretched.

In the seat back, an insert is arranged in advance in a molding die during foam molding, and a synthetic resin foaming raw material is injected into the molding die so that the insert is integrated with the cushion body at the same time when the cushion body is molded. It is obtained by forming. However, in such a seat back, since the insert is integrated with the cushion body, there is a problem in that the cushion body is hard to adapt to the movement of the body and an unpleasant sensation occurs when sitting and the riding comfort is not good.
Therefore, in recent years, a seat back as shown in FIG. 10 is often used. The seat back 50 is composed of a cushion body 51 and an insert 52. After the cushion body 51 is molded, the insert 52 is attached to the cushion body 51.
It is used by inserting it inside. The cushion body 51 includes a backrest portion 53 and a headrest portion 54 integrally formed on the upper portion of the backrest portion 53, and has a bag portion 55 and a fin portion 56 on the back surface of the backrest portion 53.

The bag portion 55 is for inserting and holding the insert 52, and as shown by the chain line in the figure, the backrest portion 5 is formed.
3 has a depth reaching the inside of the headrest portion 54 and is opened downward. Also, the fin 56
Extend inwardly from both lower sides of the bag portion 55.
The fin portion 56 is for laterally wrapping and holding the main body portion 57 of the insert 52 inserted in the bag portion 55.

However, the cushion body 5 having the above structure
In the case of 1, since the inside of the bag portion 55 is deeply formed,
Not only is it difficult to surely insert the insert 52 into the bag portion 55, but also the insert 52 may be caught in the opening 58 of the bag portion 55 at the time of insertion and the bag portion 55 may be broken.

Further, the insert 52 used for the high-back type cushion body 51 is such that the insert 52b for the headrest portion is integrated with the upper portion of the insert 52a for the backrest portion, but the headrest portion is separate. In the so-called low-back type cushion body, only the backrest insert is used. Moreover, since both types are used according to the type of vehicle, class, etc., the seat back manufacturer must prepare inserts for both types, which causes problems in parts cost and parts management. there were.

Further, the high-back type cushion body 51 has the following problems during molding. 11 and 12 show an example of a foam molding die for manufacturing the high-back type cushion body.
Reference numeral 60 in the figure is a foaming mold. As shown,
The foaming mold 60 includes a lower mold 61, an upper mold 62, and a middle mold 63 attached to the opening of the upper mold 62.
The backrest portion forming cavity 64 and the headrest portion forming cavity 65 are continuously provided. Medium 63
Is for forming the bag portion 55 and the fin portion 56 on the cushion body, and as shown in the figure, the bag portion core 66 that enters the headrest portion forming cavity 65 from the backrest portion forming cavity 64, and the backrest forming portion. It has a fin core 67 protruding into the cavity 64. Then, the synthetic resin foaming raw material is injected into the cavities 64 and 65 of the foaming mold 60, and after the upper molds 62 and 62 and the middle mold 63 are tightened, they are foamed and cured in the molds to mold a molded product.

However, as understood from FIG. 11, since the bag core 66 is inserted deep inside the cavity 65 on the headrest molding cavity 65 side, the headrest narrowed by the bag core 66. The synthetic resin foaming raw material passes through the inside of the partial molding cavity 65 while increasing the viscosity due to foaming, and the resistance at that time may impede the smooth flow of the synthetic resin foaming resin raw material. For this reason, the cushion body has a lack of wall thickness and cell roughness, and it is necessary to correct it by post-processing. In addition, when removing the mold, the middle-sized bag 5 is deep.
Since it is inserted in the bag 5, an unreasonable force is applied when the middle mold is pulled out from the bag portion 55 of the cushion body, and the opening 58 of the bag portion is likely to be broken. In addition,
It is possible to increase the thickness of the molded product in order to prevent the above-mentioned breakage and lack of thickness, but in that case, there is a problem in that the appearance of the design becomes poor.

[0009]

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve such a problem, and it is easy to insert and attach the backrest insert, and breaks during manufacture of the cushion body. An object of the present invention is to provide a cushioning body for an automobile seat back, which can be used in common for an insert for a backrest portion without causing any trouble, and has a good riding comfort, and a manufacturing method thereof.

[0010]

There are two inventions proposed here. One is an automobile seat back cushion that solves the above-mentioned problems, and the other is a manufacturing method thereof. That is, the first invention is a seat back cushion body of a vehicle in which a headrest part is integrally foam-molded on a backrest part and an upper part thereof, wherein the backrest part has a bag part having an opening at the bottom on the backside upper part,
A fin portion extending from a lower portion of the bag portion is provided inwardly on both sides of the back side, while a main body portion of a headrest insert is embedded in the headrest portion, and a stay of the headrest insert is sunk from the headrest portion to the backrest. The present invention relates to a cushion body for a seat back of an automobile, which is characterized in that the cushion body protrudes into the bag portion.

A second aspect of the invention is to inject a foaming raw material into a molding die formed by connecting a backrest molding cavity and a headrest molding cavity in a continuous manner by a lower mold, an upper mold and a middle mold. When foaming an automobile seat back cushion body in which a headrest portion is integrated with a backrest portion, one end of the middle die is placed in a backrest portion forming cavity near a headrest portion forming cavity, while the middle die Both sides of the backrest molding cavity are separated from the cavity surfaces of the lower mold and the upper mold, respectively, and the stay of the headrest insert is held inside one end of the middle mold. After placing the body of the headrest insert provided in the headrest inside the molding cavity of the headrest part, By foaming a synthetic resin foaming raw material, a backrest portion having a bag portion having a lower opening on the upper side of the back side, and fin portions extending from the lower portion of the bag portion on both sides of the back side, and a body of the headrest insert. And a headrest portion in which the stay of the headrest insert protrudes into the bag portion of the backrest portion is integrally molded.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a perspective view of an example of the cushion body of the present invention viewed from the back side thereof, and FIG. 2 is an enlarged cross-sectional view of a main part thereof. 3 to 8 are views showing a method of manufacturing the cushion body, FIG. 3 is a view showing an end surface of a cross section of a foaming mold in which the manufacturing method of the present invention is preferably implemented, and FIG. FIG. 5 is an end view showing the mold open state, FIG. 5 is an end view of a foam molding die showing a cross section when the headrest insert is attached, FIG. 6 is an end view showing a state in which a foamed resin raw material is injected into the cavity, and FIG. FIG. 8 is an end view showing the mold clamped state, FIG. 8 is an end view showing the mold open state after foaming, and FIG. 9 is a sectional view of the product released from the molding die.

As shown in FIGS. 1 and 2, a seat back cushion body 10 for an automobile according to the present invention is one in which a backrest portion 11 and a headrest portion 12 are integrally foam-molded. The bag portion 1 is provided on the upper back side of the backrest portion 11.
4 are formed. The bag portion 14 has a backrest portion 11.
It is for inserting the backrest insert 20 therein, and has an opening 13 below the backrest 11. On the upper portion of the backrest insert 20, there are provided stay guides 24, 24 for attaching the stay 23 of the headrest insert 21. At the bottom of the bag portion 14, the fin portion 1 is formed along the left and right sides of the backrest portion 11.
5 are formed inward, respectively.

On the other hand, the headrest portion 12 is integrally provided on the upper portion of the backrest portion 11, and the main body portion 22 of the headrest insert 21 is provided inside the stay portion 23.
Is embedded in the bag portion 14 in a protruding state.

In this cushion body 10, the backrest insert 20 is inserted into the bag portion 14 and the back side of the fin portion 15 through the opening 13 of the bag portion, and the stick portion protruding from the headrest portion 12 into the bag portion 14 is inserted. By attaching 23 to the stay guide 24, a seat back of an automobile is obtained. Since the backrest insert 20 that is attached later is only the backrest, it is possible to use a low-back type insert in which the headrest portion and the backrest portion are separate.

According to this cushion body 10, the main body portion 22 of the headrest insert 21 is embedded in the headrest portion 12 of the cushion body 10, and the hollow portion for later inserting the insert into the headrest portion is provided with the bag portion 1.
Since it is not necessary to form it in the inner part of the bag 4, it is possible to make the depth inside the bag portion 14 shallow, and to insert the backrest insert 20.
The opening 13 of the bag portion is not torn or torn during insertion of the. In the conventional high-back type cushion body shown in FIG. 10, the depth inside the bag portion was about 40 cm, whereas in this example it was about 15 cm.

FIG. 3 and FIG. 4 show an example of a foaming mold for suitably implementing the manufacturing method of the present invention. In the figure, reference numeral 30 is a foaming mold, 31 is a lower mold, 32 is an upper mold, and 33 is a middle mold. The lower mold 31, the upper mold 32, and the middle mold 33 form a backrest portion molding cavity 34 and a headrest portion molding cavity 35 in a continuous manner.

A plurality of ridges 40 are provided upright on the inner bottom surface of the lower mold 31. The ridge 40 is for holding the middle mold 33, which will be described in detail later, at a predetermined height, and is used for forming a hole for suspending the skin after molding the product. Upper mold 32
Is openable and closable via a hinge 41 at the rear of the mold. In the embodiment, a frame 43 is connected to the upper mold 32, and one end of the front upper mold 32 is configured as a lifting handle 46. The frame 43 is for opening and closing the upper mold 32 and the middle mold 33 in conjunction with each other, and a bar-shaped member 45 that engages with an engaging portion 44 of the middle mold 33 in the front.
However, suspension rods 49a are provided at the rear via the arms 49, respectively. The engaging portion 44 is formed at the front of the middle die 33 with its tip bent into a hook shape, and when the upper die 32 is once raised, the frame 4 is moved, as shown in FIG.
By engaging with the rod-shaped member 45 of No. 3, the middle die 33 is raised together with the upper die 32. Further, a floating member 48 having an elongated hole 47 is provided behind the middle die 33, and the suspension rod 49a is loosely fitted therein. As a result, when the mold is opened, the middle mold 33 is allowed to move forward by a certain distance, and the molded product can be easily released from the mold.

Next, FIGS. 5 to 9 show an example of a method of manufacturing the cushion body 10 using the foaming mold. Note that, for simplification of the drawing, illustrations of the above-described foam molding die accessory parts such as the frame 43 and the engaging portion 44 are omitted. First, as shown in FIG. 5, an upper mold 32 and a middle mold 33.
And the headrest insert 21 is attached to the middle die 33. The bag portion 14 of the cushion body 10 is provided on one end side (the headrest portion forming cavity side) of the middle die 33.
On the other hand, the bag portion core 36 for forming the fin portion 15 is provided on both sides of the middle die 33 with the same fin portion core as the fin portion core 67 shown in FIG. 12 for forming the fin portion 15, respectively. The apparatus is separated from the cavity surfaces of the lower mold 31 and the upper mold 32. The bag portion core 36 has a stay holding portion 38 formed of a hole at the tip thereof and projects into the backrest portion forming cavity 34 near the headrest portion cavity 35. The headrest insert 21 is held in a state where the stay 23 is attached to the stay holding portion 38 and the main body portion 22 is arranged in the headrest portion molding cavity 35.

Then, as shown in FIGS. 6 and 7, the synthetic resin foaming raw material P is injected into the molding die 30 and the upper die 3
The lower mold 31 is covered with the upper mold 2 and the middle mold 33, and the mold is clamped to form the foam integrally with the headrest insert 21. Thereby, the body portion 22 of the headrest insert 21 is integrally embedded in the headrest portion 12. When that foaming,
The headrest molding cavity 35 has a large cavity space since the main body of the headrest insert 21 only projects into the interior thereof, and the middle mold 33 hardly projects, so that the synthetic resin foaming raw material P can be easily filled.
There is almost no risk of the cells crushing.

After foaming and curing, the mold is opened as shown in FIG. 8, and the cushion body 10 is removed from the middle mold 33. Since the cushion body 10 is formed so that the inside of the bag portion is shallow, there is no possibility that the opening portion is broken due to the bag portion core 36 being caught at the time of demolding. As can be understood from FIG. 9, the main body portion 22 of the headrest insert 21 is integrally embedded in the headrest portion 12 of the obtained cushion body 10, and the main body portion 22 of the headrest insert 21 is embedded in the bag portion 14 formed on the back surface of the backrest portion 11. The stay 23 of the headrest insert 21 projects.

[0022]

As shown and described above, according to the cushion body for a vehicle seat back and the method for manufacturing the same of the present invention, the headrest insert is embedded in the headrest portion of the cushion body, and therefore the backrest insert. The bag portion for can be formed to have a shallow depth. Therefore, the insertion and attachment of the backrest insert can be facilitated and the opening of the bag portion can be prevented from breaking. In addition, since the inside of the bag is shallow, the feeling of fluttering of the bag, which is common in the conventional high-back type seat back, does not occur, and a sense of unity with the insert can be obtained.
On the other hand, in the backrest, since the backrest insert and the cushion body are not integrally foam-molded, the cushion body is freely deformed according to the weight of the body, and the seating feeling and riding comfort are good. Further, the insert for a backrest used in a so-called low-back type cushion body in which the headrest portion and the backrest portion are separate from each other can be used in the cushion body of the present invention and the method for manufacturing the same, and common use of parts is possible. Possible and extremely economical.

[Brief description of drawings]

FIG. 1 is a perspective view of an example of a cushion body of the present invention viewed from the back side thereof.

FIG. 2 is a cross-sectional view showing an enlarged main part thereof.

FIG. 3 is a view showing an end surface of a cross section of a foaming mold in which the manufacturing method of the present invention is preferably implemented.

FIG. 4 is an end view showing the mold open state.

FIG. 5 is a view showing the method of manufacturing the cushion body, and is an end view of the foaming mold showing a cross section when the headrest insert is attached.

FIG. 6 is an end view showing a state where a foamed resin raw material is injected into the cavity.

FIG. 7 is an end view showing a mold clamped state.

FIG. 8 is an end view showing the mold open state after foaming.

FIG. 9 is a cross-sectional view of a product released from the mold.

FIG. 10 is a perspective view of a conventional seat cushion cushion for an automobile as viewed from the back side.

FIG. 11 is an end view showing an example of the foaming mold.

FIG. 12 is an end view taken along the line 12-12.

[Explanation of symbols]

 10 Cushion 11 11 Backrest 12 Headrest 13 Opening 14 Bag 15 Fin 20 Insert for backrest 21 Headrest insert 22 Headrest insert body 23 Headrest insert stay 30 Foam molding 31 Lower mold 32 Upper mold 33 Medium size

Claims (2)

[Claims] 1. A cushion body for an automobile seat back, wherein a headrest portion is integrally foam-molded on a backrest portion and an upper portion of the backrest portion, wherein the backrest portion has a bag portion having an opening at the lower side at an upper portion on the back side, and the bag portion. Has a fin extending inward from both sides on the back side, while the headrest part has a main body of a headrest insert embedded therein, and a stay of the headrest insert is a bag of the backrest part from the headrest part. A cushion body for an automobile seat back, which is characterized in that it protrudes into the interior. 2. A foaming raw material is injected into a molding die formed inside by forming a backrest molding cavity and a headrest molding cavity in a continuous manner by a lower mold, an upper mold and a middle mold, and a backrest part and an upper part thereof. When foam-molding an automobile seat back cushion body in which the headrest part is integrated, the one end of the middle mold is placed in the backrest part forming cavity close to the headrest part forming cavity, while both sides of the middle part are made into the backrest part. Headrest inserts provided in the stays are provided in both sides of the molding cavity separately from the cavity surfaces of the lower mold and the upper mold, respectively, and the stays of the headrest inserts are held in one end side of the middle mold. After arranging the main body of the inside of the headrest molding cavity, the synthetic resin foam raw material is placed in the molding die. By foaming, a backrest having a bag portion opened downward on the back side and having fins extending from the bottom of the bag on both sides of the back side, and the body of the headrest insert are embedded and A method for manufacturing a cushion body for an automobile seat back, comprising integrally forming a stay of a headrest insert and a headrest portion projecting into the bag portion of the backrest portion.