JPH0422685B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a cushion body for a vehicle.

Conventionally, a cushion body for a vehicle, particularly a cushion body for a back part, is prepared by preparing a bag-shaped foam body 3 having fins 2, 2 at an opening on the rear side as shown in FIG. After inserting a substantially bag-shaped frame 5 with a plurality of springs 4 installed on the back side so that the springs 4 are positioned on the back side of the bag-shaped foam 3,
It is manufactured by bending the fins 2, 2 inward and fixing them to the frame 5 with adhesive or the like, and then covering them with a skin (not shown) such as leather.
In addition, as another method, as shown in FIG.
A method of manufacturing a cushion body by inserting a frame 5 similar to the above into a bag-like foam 3' consisting of 8 and fixing it with adhesive, and then covering the same with leather or the like with a skin (not shown). It has been known.

However, in the former method, since the fins 2, 2 are forcibly bent inward, there is a risk that the bases of the fins 2, 2 may be cut. Furthermore, in the latter method, when inserting the frame 5 into the bag-like foam 3', the eave-like side walls 8, 8 are bent upward to open them, so there is a risk that the frame 5 may be partially cut out. Furthermore, in both methods, after the bag-shaped foam is molded in advance, a frame with a spring must be inserted into the bag-shaped foam and fixed with an adhesive or the like, so the number of steps is large.
Not only does this require complicated work, but it also has the drawback that the adhesion between the envelope-shaped foam and the frame is poor, causing the frame to shift.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and provides a method for manufacturing a cushion body for a vehicle that has good adhesion between the bag-shaped foam and the frame without causing cutouts in the bag-shaped foam through a simple process. This is what I am trying to do.

That is, the present invention provides a bag using a mold comprising a lower mold, a middle mold attached to one side of the lower mold so as to be openable and closable, and an upper mold attached to the lower mold so as to be openable and closable. In the method for manufacturing a cushion body for a vehicle, a frame having a plurality of springs installed on the back is installed in the middle mold in the molding chamber of the lower mold,
After the mold is clamped by an upper mold, a foam stock solution is injected into the mold, and the inside of the frame is left hollow, and the back part of the frame, the hook-shaped side part, and the spring are integrally foam-molded. be.

Example Next, examples of the present invention will be described.

FIG. 3 shows a molding apparatus for obtaining the vehicle cushion body of this embodiment, and is equipped with a mold consisting of three molds: a lower mold 11, a middle mold 12, and an upper mold 13. The upper mold 13 is formed of a substantially U-shaped frame, and the open end of the frame is formed by hinges 14a, 14.
It is attached to the lower mold 11 via b so as to be openable and closable. A U-shaped fixing member 15 is arranged on the upper mold 13 so as to sandwich both ends of the upper mold 13. The fixing member 15 is loosely fitted into mounting fittings 16a and 16b attached to the side of the upper mold 13, so that the upper mold 13 can be opened and closed smoothly. Furthermore, hook-shaped fixing claws 17a and 17b are formed at the tip of the fixing member 15. The fixing claws 17a and 17b are locking pieces 18a and 1 fixed to both sides of the lower die 11, respectively.
The grooves 19 of the upper die 13 are engaged with the grooves 19 of the upper die 8b to fix the position of the upper die 13 when the upper die 13 is opened. The locking pieces 18a, 18b are chevron-shaped, and the fixing position of the upper mold 13 can be adjusted by changing the positions of the grooves 19 along the chevron-shaped peripheral surface and the fixing claws 17a, 17b. .

Further, the middle mold 12 is mounted on a hinge (not shown) on one side of the lower mold 11 to which the upper mold 13 is attached.
It is attached so that it can be opened and closed via the This middle mold 12 is attached to the upper mold 13 when the upper mold 13 is opened by a connecting member 21 made of a chain or the like that connects a holding plate 20 attached to the opening of the upper mold 13 and the back surface of the middle mold 12. It is designed to be fixed in a suspended state. Further, on the upper surface of the medium mold 12, first and second U-shaped protrusions 22 and 23 are formed in a step-like manner. The opening of the upper mold 13 is fitted into the first protrusion 22 during mold clamping, and the upper mold 13 comes into contact with the flat steps of the protrusion 22, serving to close the opening. . Said second protrusion 23
The inner side of the frame abuts against the wall, and the U-shaped side of the frame is fitted into the lateral bulge that forms the step surface. A thin tongue piece 24 is formed on the tip side of the medium mold 12. A protrusion 26 is formed at the tip of this tongue piece 24 for fitting into a notch 25 formed in the lower mold 11 and supporting the middle mold 12.

Next, a method of manufacturing a vehicle cushion body using the above molding apparatus will be explained.

First, the fixing claws 17a, 17b of the fixing member 15 are fitted into the central portions of the grooves 19, 19 in front of the locking pieces 18a, 18b to fix the tongue piece 24 of the medium sized 12 upward, and then As shown in the imaginary line in Figure 3, the front and back sides are open, and the sides have a U-shaped cross section.
A frame 28 having a plurality of springs 27 . After the frame 28 is set in this manner, the hook-shaped end surface of the side portion of the frame 28 comes into contact with the wall surface of the second protruding portion 23 of the medium size 12, and the upper surface of the side portion of the frame 28 contacts the upper surface of the second protruding portion 23. located lower. Further, the inner surface of the head of the frame 28 fits into the tongue piece 24 of the medium size 12, and the upper surface of the head is located lower than the upper surface of the second projecting portion 23. Furthermore, the plurality of springs 27 . Note that a hole is formed in the side surface of the head of the frame 28 to allow the protrusion 26 at the tip of the medium 12 to pass through.

Next, the fixing claws 17a and 18b of the fixing member 15
are moved to the grooves 19, 19 in front of the locking pieces 18a, 18b to tilt the upper mold 13 toward the lower mold 11 side, and the middle mold 1 connected to the upper mold 13 by the connecting member 21
2 was put into the lower mold 11, the protrusion 26 at the tip was fitted into the notch 25 of the lower mold 11, and the middle mold 12 was set. At this time, the back surface of the middle mold 12 and the bottom surface of the lower mold 11 are spaced apart from each other by a sufficient height, and a space is formed between the back surface of the middle mold 12 and the bottom surface of the lower mold 11.
A gap with a desired width is formed between the side edge and the inner wall surface of the lower die 11.

Next, the fixing claws 17a, 17b of the fixing member 15
grooves 19, 19 at the frontmost part of the locking pieces 18a, 18b.
Then, the upper mold 13 was clamped.
At this time, the opening of the upper mold 13 was fitted into the first protrusion 22 of the middle mold 12, and the opening was closed. Also,
By abutting the upper mold 13 against the upper surface of the wall of the lower mold 11, a predetermined space was formed between the contact surface of the upper mold 13 and the upper surface of the frame 28 set on the middle mold 12.

Next, for example, a polyurethane foam stock solution was injected into the mold to carry out foam molding. At this time, lower mold 1
1 and the middle mold 12 is foamed, and passes between the side of the frame 28 set in the middle mold 12 and the inner wall surface of the lower mold 11 and passes between the upper surface of the frame 28 and the upper mold 13. The outer peripheral surface of the frame 28 other than the hollow part and the plurality of springs 27 installed in the frame 28...
A bag-like polyurethane foam integrated with ... was molded. Subsequently, the upper mold 13 is released by moving the fixing claws 17a, 17b of the fixing member 15 backward, and after lifting the middle mold 12, the middle mold 12
The frame 28 integrally molded with the bag-shaped polyurethane foam was taken out.

According to the above method, the frame 28 having the springs 27 is set in advance on the middle mold 12, and after the mold is clamped, the polyurethane foam stock solution is injected into the mold to perform foam molding. As shown in the figure, a cushion body for a vehicle consists of a frame 28 having a plurality of springs 27 on the back side, and a bag-shaped polyurethane foam 29 that is integrated so as to wrap the outer peripheral surface of this frame 28 and the springs 27. can be obtained. Therefore, by adopting the integral molding method, the bag-shaped polyurethane foam 29
The adhesion between the frame 28 and the frame 28 is improved, and
Since the springs 27 of the frame 28 can be wrapped with a portion of the foam 29, displacement of the frame 28 can be reliably prevented. In addition, the process is simplified and a complicated fastening process is eliminated, so high-quality vehicle cushion bodies without notches can be mass-produced at a high yield.

In the above embodiment, the vehicle cushion body was manufactured using the molding apparatus shown in FIG.
Three other types of molding equipment may also be used.

Although a polyurethane foam stock solution was used in the above embodiments, other synthetic resin foam stock solutions such as a polyester foam stock solution may also be used.

As described in detail above, according to the present invention, by setting the frame having the spring in a medium size and performing integral foam molding, the frame and the spring can be formed in a simple process without causing notches in the bag-like foam. This method has remarkable effects such as being able to form a bag-shaped foam body that adheres well to the material, and making it possible to mass-produce high-quality vehicle cushion bodies that do not cause frame displacement, etc., at a high yield.

[Brief explanation of drawings]

FIGS. 1 and 2 are perspective views showing the production of conventional vehicle cushion bodies, FIG. 3 is a perspective view showing an embodiment of a molding apparatus used in an embodiment of the present invention, and FIG. 4 is a perspective view showing the production of a conventional vehicle cushion body. FIG. 2 is a perspective view showing a vehicle cushion body obtained in an example. 11...Lower mold, 12...Medium mold, 13...Upper mold,
15...Fixing member, 17a, 17b...Fixing claw,
18a, 18b...locking piece, 22, 23...projection, 24...tongue piece, 27...spring, 28...frame, 29...bag-shaped polyurethane foam.

Claims (1)

[Claims] 1. A bag-shaped vehicle cushion body is produced using a mold comprising a lower mold, a middle mold attached to one side of the lower mold so as to be openable and closable, and an upper mold attached to the lower mold so as to be openable and closable. In the method for manufacturing, a frame having a plurality of springs on the back is installed in the middle mold in the molding chamber of the lower mold, and after the mold is clamped by the upper mold, a foam stock solution is injected into the mold, and the inside of the frame is 1. A method of manufacturing a cushion body for a vehicle, characterized in that the back part of the frame, the hook-shaped side part, and the spring are integrally foam-molded while leaving the cushion body hollow.