JPH04351513A - Mold for cushion with different hardness - Google Patents

Abstract

PURPOSE:To provide the mold for cushion with different hardness, while, when soft urethane is inserted into the space between partition walls, the soft urethane does not spring up and is brought into contact with bottom surface, and then no clearance is generated therebetween, even if the bottom surface between the partition walls of a bottom force is a curved surface. CONSTITUTION:Upward directing fixing pieces 16 are provided on the upper ends of the opposite partition walls 12 provided on the bottom surface 17 of a bottom force 11 with a prescriber distance. The space between the partition wall 12 and a side wall 14 are made to be a cavity 15 for pouring hard urethane when a top force 19 is superimposed on the bottom force 11, and soft urethane is inserted into the space 13 between the partition walls 12.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for forming cushion bodies of different hardness for automobile headrests, seat seats, center armrests, furniture chairs, and the like.

0002

[Prior art] Figures 6 and 7 are examples of cushion bodies with different hardness.
To explain the automobile headrest 1 shown in
The headrest 1 is composed of a main body urethane portion 2 (hard urethane portion) having a U-shaped cross section and a soft urethane portion 3 having a rectangular cross section and having air permeability.

[0003] During molding, the soft urethane portion 3
is inserted into the space 23 between the partition walls 22 facing each other at a distance in the lower mold 21 of the splittable mold shown in FIG. The urethane foam is injected into the cavity 25 containing the urethane foam. As a result, the main body urethane 2 and the soft urethane portion 3 come into close contact, creating a headrest with different hardness. At this time, the partition wall 22 has the function of positioning the soft urethane portion 3 within the lower mold 21.

0004

[Problems to be Solved by the Invention] However, if the bottom surface 27 between the partition walls 22 is flat as shown in FIG. If the bottom surface 27a between the partition walls 22 is curved as shown in FIG. , a gap 26 is formed at the base of the partition walls 22, not along the curved surface of the bottom surface 27a between the partition walls 22. In this state, an upper mold (not shown) is stacked on the lower mold 21, and hard urethane, which is the material for the main body urethane portion 2, is injected into the cavity 25 and foamed. When the injected urethane enters the gap 26 and solidifies, a headrest with a different hardness is required. A hard urethane layer forms on the surface of the soft layer, reducing the value of the product.

[0005] This invention has a different hardness that prevents the soft urethane part from springing up when the soft urethane part is inserted between the partition walls and does not create the above-mentioned gap even if the bottom surface between the partition walls of the lower mold is a curved surface. The objective is to provide a mold for a cushion body.

[0006]

[Technical Means for Solving the Problems] In order to solve the above problems, the present invention has partition walls arranged at a distance from each other, and between the partition walls is a main body urethane part and a soft urethane part. In the mold for a cushion body of different hardness into which the soft urethane portion of the cushion body of different hardness is inserted, the partition wall is provided with a locking piece for locking the soft urethane portion inserted between the partition walls. are doing.

[0007]

[Operation] When the soft urethane part is inserted between the partition walls of the mold, the soft urethane part is locked by the locking piece, so even if the bottom surface between the partition walls is curved, the soft urethane part will move along this curved surface. The urethane part is curved and prevented from springing up due to its own elasticity. Therefore, no gap is formed between the base of the partition wall or the bottom surface between the partition walls and the soft urethane part, so even if the hard urethane material to form the main body urethane part is injected into the mold, the soft urethane part does not contain the main body urethane material. No parts are exposed.

[0008]

EXAMPLES The present invention will be explained below with reference to FIGS. 1 to 5 showing examples. Lower mold 11 of mold 10 that can be divided into upper and lower molds
Similar to the conventional lower mold 21, partition walls 12 are provided facing each other at a distance, and a locking piece 1 is provided at the upper end of the partition wall 12.
6 is provided facing inward. The length of the locking piece 16 is 2~
It is 3〓. The bottom surface 17 between the partition walls 12 is curved upward. 14 is a side wall of the lower mold 11, and a cavity 15 including a space between the side wall 14 and the partition wall 12 is formed. Further, a space 13 is formed between the partition walls 12. 19 is the upper mold of the mold 10. Soft urethane part 3
The thickness is the height of the partition wall 12 (the height h to the locking piece 16)
) is desirably 0 to 5 times larger. Further, it is desirable that the width of the soft urethane portion 3 is 0 to 10 times larger than the length L of the curved surface 17 between the partition walls 12. The soft urethane portion 3 has a hardness of 6 to 15 (JIS K6401) and may or may not have air permeability.

In the above configuration, the soft urethane portion 3
As shown in FIG. 2, it is pushed into the space 13 between the partition walls 12 from above the lower mold 11, is prevented from falling off by the locking piece 16, and is forced along the curved bottom surface 17 between the partition walls 12. Curved. The cross-sectional shape and planar shape of the soft urethane portion 3 are both rectangular. At this time, the soft urethane portion 3 contracts slightly in the direction of its height and in the direction of the spacing between the partition walls 12.

After inserting the soft urethane part 3 into the space 13 between the partition walls 12, as shown in FIG. Inject urethane material. The injected urethane material foams to fill the inside of the mold 10 and forms an impregnated and fixed layer of 0.5 to 2.5 mm on the upper contact surface of the soft urethane part 3, so that the soft urethane part 3 Integrate with part 2. Therefore, there is no need to apply a special coating such as a film to the portion of the soft urethane portion 3 that comes into contact with the injected urethane to prevent impregnation with the injected urethane.

During the above molding, since the gap 26 shown in FIG. 9, which was a problem in the prior art, does not exist, the main body urethane portion 2 is formed on the surface of the soft urethane portion 3 along the curved bottom surface 17 and the partition wall 12. Intrusion is prevented. As a result, the area of the soft urethane portion 3 of the headrest 1 can maintain its original softness and maintain a predetermined concave shape.

Although the above description has been made regarding the mold 10 for a headrest made of cushioning materials of different hardness, the technical idea of the present invention is applicable to automobile seats, center armrests, household chairs, etc. made of cushioning materials of different hardness. It can also be applied to molds such as

[0013]

Effects of the Invention Since the mold of the present invention has the above-mentioned configuration, automobile headrests, center armrests, etc. made of cushioning materials of different hardness molded by this mold can be
In seats, household chairs, etc., the soft urethane part deforms along the curved bottom surface between the partition walls of the lower mold, and does not form a gap at the joint between the curved surface and the partition wall, so the hard urethane part of the main body is The molded product does not extend to the outer surface of the soft urethane portion, resulting in a molded product with good appearance.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the entire mold.

FIG. 2 is a sectional view of the lower mold.

FIG. 3 is a cross-sectional view of the soft urethane portion inserted into the lower mold.

FIG. 4 is an enlarged view of section A in FIG. 3;

FIG. 5 is a cross-sectional view showing a state in which the headrest is molded within the lower mold.

FIG. 6 is a perspective view of the headrest.

FIG. 7 is a sectional view of the headrest.

FIG. 8 is a sectional view when the soft urethane portion of the headrest is inserted into the lower mold.

FIG. 9 is a cross-sectional view when the soft urethane part of the headrest is inserted into a lower mold different from that shown in FIG. 8.

[Explanation of symbols]

10 Molding mold, 11 Lower mold, 12 Partition wall, 16 Locking piece, 19 Upper mold

Claims (1)

[Claims] 1. A cushion body of different hardness, which has partition walls arranged oppositely at a distance, and in which the soft urethane portion of the cushion body of different hardness is inserted between the partition walls. 1. A mold for a cushion body of different hardness, characterized in that the partition wall is provided with a locking piece for locking a soft urethane portion inserted between the partition walls.