JPS5931125A - Manufacture of vehicle cushion body - Google Patents

Abstract

PURPOSE:To grade up a cushion body by a method wherein a frame having a spring is set in a core to effect an integral foam molding so that a disengagement or slippage of the frame is prevented. CONSTITUTION:A frame 28 having a plurality of springs at its rear surface is provided in a core 12 within a cavity of bottom force 11, and a molding liquid is poured through top force 13. According to the above method, while keeping the inside of the frame 28 in a hollow state, the rear part of the frame 28, the outer surface of the side part of the hook-shape and a springs 27 are integrally foam-molded. Thus, a vehicle cushion body having a good adhesive property between the foamed body and the frame is obtained in a simple process and without causing scratching or notching on a bag shaped foamed body 29.

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. A frame 5 in the form of a frame 5 with a plurality of springs 4 .lambda.
After inserting the spring 4 so that it is positioned on the back side of the bag-shaped foam 3, the fins 2, 2 are bent inward and fixed to the frame 5 with adhesive, etc., and then a piece of leather etc. It is manufactured by encapsulating it with an epidermis (not shown). As another method, as shown in FIG. 2, there is a back section 6. A frame 5 similar to the above is inserted into the bag-shaped foam body 3' consisting of the eave-shaped head 7 and the eave-shaped side walls 8, 8, and is attached one by one with adhesive. It is known to produce cushion bodies by encasing them.

However, in the former method, since the fins 2, 2 are forcibly bent inward, there is a risk that the i-1 roots of the fins 2, 2 may be cut. Further, in the latter method, when inserting the frame 5 into the bag-like foam 3', the eave-like side walls 8, 8 are pushed upwards by σH, so there is a risk of partial notches. Furthermore, in both methods, after the bag-shaped foam is molded in advance, a frame with springs must be inserted into the bag-shaped foam and fixed with adhesive, etc., resulting in a large number of steps and complicated work. In addition, there was a drawback that the adhesion between the envelope-shaped foam and the frame was poor, causing the frame to shift.

The present invention has been made to solve the above-mentioned drawbacks.1i
It is an object of the present invention to provide a method for manufacturing a cushion body for a JE vehicle that has good adhesion between the foam and the frame without causing notches in the bag-shaped foam through a simple process.

That is, in the present invention, a frame with a plurality of springs installed on the back side is installed in a middle mold in a molding chamber of a lower mold, and 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 hollowed out. It is characterized in that it is integrally formed with the outer surface of the back and hook-shaped side parts of the frame, as well as the spring, by foam molding.

Next, the present invention will be explained in detail.

The lower mold 11. It is equipped with a mold consisting of three molds: 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 a hinge 14a.

It is attached to the lower mold 11 via 14b so as to be openable and closable. U-shaped fixing parts i, g' J s are arranged on the upper mold 13 so as to sandwich both ends of the upper mold 13.

This fixing member 15 is a mounting bracket 16m attached to the side of the upper die 13.

16b, so that the upper mold 13 can be opened and closed smoothly. Furthermore, a hook-shaped fixing claw 17ar17b is formed at the tip of the fixing member 15. These fixing claws 17 a r 17 b are locking pieces 18 a * 1 Fl fixed to both sides of the lower mold 11, respectively.
b is engaged with the grooves 19... to fix the position of the upper die 13 when it is opened. Note that the locking piece 18
a.

18b has a chevron shape, and by changing the positions of the groove 19 along the chevron-shaped circumferential surface and the fixing claws 17a, 17b, the upper mold 1
3 fixed positions can be adjusted.

Furthermore, the middle die 12 is attached to one side of the lower die 11 to which the upper die 13 is attached, via a hinge (not shown) so as to be openable and closable. This middle mold 12 is connected to the opening 11k of the upper mold 13 by means of a connecting member 21, such as a chain, which connects a holding plate 20 attached to the opening 1 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, a first mouth-shaped opening is provided. The second protrusion 22.23 is 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. . The inner side of the frame comes into contact with the wall of the second projecting portion 23, and the U-shaped side of the frame is fitted into the lateral bulge that forms the step surface. Said medium size 1
A thin tongue piece 24 is formed on the distal end side of 2. At the tip of this tongue piece 24, there is a protrusion 2 that fits into a notch 25 formed in Ll' in the lower die 11 and supports the middle die 12.
6 is formed.

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

First, the fixing claws 17 a t 17 b of the fixing member 15 are attached to the front of the locking pieces 18 a e 18 b.
, 19, and the tongue piece 24 of the medium size 12.
After fixing it upward, the front and back sides are opened as shown by the imaginary lines in FIG. The provided frame 28 was inserted into the medium mold 12 from the tongue 24 side and set in the medium mold 12. After the frame 28 is set in this way, the hook-shaped end surface of the frame 28 (D) on the side comes into contact with the wall surface of the second protruding part 23 of the medium 12, and the upper surface of the side part of the frame 28 contacts the second protruding part 23. The inner surface of the head of the frame 28 is located lower than the top surface of the frame 23.
The top surface of the head is fitted into the second tongue piece 24.
V1 is lower than the upper surface of the protrusion 23. Furthermore, the springs 27 '61i of the frame 28 come into contact with the back surface (lower surface) of the medium size 12 and are held in place.

Note that a hole is formed on the side surface of the head of the frame 28 for passing the protrusion 26 at the tip of the medium 12.

Next, the fixing claws 17 a p 17 b of the fixing member 15 are moved to the grooves 19 and 19 in front of the locking pieces 18 a and 18 b to tilt the upper mold 13 toward the lower mold 11 side, and the connecting member 21 is attached to the upper mold 13 . The connected middle mold 12 was placed in the lower mold 11, and the protrusion 26 at the tip thereof was fitted into the notch 25 of the lower mold 11, so that 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 of desired width is formed between the side edge and the inner wall surface of the lower die 11.Next, the fixing claws 17a and 17b of the fixing member 15 are inserted into the grooves 19°19 at the frontmost part of the locking pieces 18a+18b. The upper mold 13 was then moved and clamped. At this time, upper mold 1
The opening 3 was fitted into the first protrusion 22 of the medium mold 12, and the opening was closed. Also, by the upper mold 13 coming into contact with the upper surface of the wall of the lower mold 11, the contact surface of the upper mold 13 and the middle mold 12
A predetermined space was formed between the frame 28 and the upper surface of the frame 28 set therein.

Next, foam molding was performed by injecting, for example, a polyurethane foam stock solution into the mold. At this time, the foam stock solution injected between the lower mold 11 and the middle mold 12 is foamed, and the same frame 28 is passed through the gap between the side of the frame 28 set in the middle mold 12 and the inner wall surface of the lower mold 1. The plurality of springs 27 and 27 extend around the space between the upper surface and the upper mold 13 and are installed on the outer peripheral surface of the frame 28 other than the hollow part and on the frame 28.
A bag-shaped polyurethane foam integrated with ... was molded. Subsequently, the upper mold 13 is attached to the fixing claw 17a of the fixing member 15.
, 17b is opened by moving backward, and the medium-sized 1
2, the frame 28 integrally molded with the bag-shaped polyurethane foam was taken out from the middle mold 12.

However, according to the above method, the spring 27 is attached to the medium 12 in advance.
After setting the frame 28 and clamping the mold, pour the undiluted urethane foam into the mold and perform foam molding to form a plurality of springs 2 on the back side as shown in Fig. 4.
A cushion body for a vehicle can be obtained, which includes a frame 28 having a frame 28 and a bag-shaped polyurethane foam 29 that is integrated so as to surround the outer circumferential surface of the frame 28 and the springs 27 . Therefore, by adopting the integral J-shaped method, the adhesion between the bag-like polyurethane foam 29 and the frame 28 is improved, and the springs 27 of the frame 28 are connected to a part of the foam 29. Since it can be wrapped, displacement of the frame 28 can be reliably prevented.

In addition, the process is simplified and the complicated fixing process is eliminated, so that high-quality cushion bodies for vehicles 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. 3, but other three types of molding apparatuses may 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 with the spring in a medium size and performing integral foam molding, the frame and the spring can be easily formed without causing notches in the bag-like foam through a simple process. The present invention has remarkable effects such as being able to form a bag-like foam body that is in close contact with the frame, thereby enabling high-quality vehicle cushion bodies that do not cause frame displacement etc. to be mass-produced at a high yield.

[Brief explanation of the drawing]

FIGS. 1 and 2 are perspective views showing the production of a conventional vehicle cushion body, 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 manufacturing of a conventional vehicle cushion body. It is a perspective view showing the cushion body for 11 degrees Celsius obtained by the example. 1..lower mold, 12..middle mold, 13..upper mold, 1
5...Fixing member, 17a, 17b-fixing claw,
18a. 18b...Locking piece, 22, 23...Protruding portion, 24.
... tongue piece, 27 ... ligne, 28 ... frame, 29
...Bag-shaped polyurethane foam. Figure 1 Figure 2

Claims (1)

[Claims] A frame with a plurality of springs on the back is installed in the middle mold in the lower molding chamber, and after the mold is clamped by the upper mold, a foam stock solution is injected into the mold, leaving the inside of the frame hollow. 1. A method for producing a cushion body for a vehicle, which comprises integrally foam-molding a back part, a key-shaped side part, and a spring.