JPH04117720U - Foam molding mold for bare headrest with different hardness - Google Patents

Abstract

(57) [Summary] [Objective] To provide a foam mold for a bare headrest with different hardness, which can make the head contact portion of the bare headrest with a different hardness have a desired soft feel. [Structure] Partition plates 56 and 58 facing each other at a predetermined distance are provided at a predetermined portion of the cavity surface 64 to partially partition the cavity surface 64, and the partitioned cavity surface 64a is made of a foam having a predetermined hardness. The member 66 of different hardness can be sandwiched and held between the partition plates 56 and 58, and the opposing partition plate 5
6, 58, the bases 56a, 58a are mold dividing surfaces 4
0, 42, and the partition plates 56, 58 can rotate around the tips of the bases 56a, 58a when the mold is opened. Of the mold dividing surfaces facing each other with the plates 56 and 58 in between, the mold dividing surfaces 40a and 42a on the different hardness member 66 side are provided with elastic sealing materials 69 and 71 for sealing between them and the rotary partition plate.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention is a bare head with different hardness in which the pillow part is made of two or more foams with different hardness. Regarding a foam mold for rests.

0002

[Conventional technology]

Bare headrests with different hardness are used as car headrests, with the pillow part covered with a skin. Usually, as shown in Fig. 6, the part 10 in contact with the head is larger than the other parts. Constructed of soft foam with different hardness, it feels soft when it comes in contact with the head. It is designed to be By the way, the present applicant has previously discovered that the bare headrest with different hardness can be easily molded. When demolding bare headrests with different hardness, defects such as tears may occur in the pillow part of the headrests. A unique foam mold was proposed in Japanese Patent Application No. 2-324146. The foam mold is , as shown in the cross-sectional view of FIG. Partition plates 14 and 15 are provided to partially partition the cavity surface, and the partitioned cavity A member 16 of different hardness made of foam having a predetermined hardness is held and held between the partition plates 14 and 15 on the tee surface 12a. At the same time, the opposing partition plates 14 and 15 are The partition is provided so that the protruding base part is sandwiched between the mold dividing surfaces 20 and 22 within the partition 18. The structure is such that plates 14 and 15 can rotate when the mold is opened.

0003 The molding of bare headrests with different hardness is carried out using foam molds of specified hardness. A member 16 of different hardness consisting of a solid body is sandwiched between partition plates 14 and 15 to form a key partitioned by the partition plates. It is held on the cavity surface 12a, and then the liquid foaming raw material 24 is injected into the closed cavity 18. Then, the pillow part is foam-molded together with the different hardness member 16, and then the foam mold is opened and the partition is formed. This is done by rotating the plates 14 and 15 and taking out the bare headrest with different hardness. 26 in the diagram is an insert. At that time, the cavity of the mold divided by the partition plate is An undercut shape is formed by the cutting plate, but when the mold is opened, the partition plates 14 and 15 Rotation eliminates the undercut shape, making it possible to use bare headrests with different hardness. It becomes difficult to take out the headrest, or a part of the bare headrest with different hardness becomes part of the partition plate. Efficiently create bare headrests with different hardness without causing problems such as getting caught and tearing. can be molded. In addition, since the member 16 of different hardness is sandwiched between the partition plates 14 and 15, the liquid Misalignment of the member 16 of different hardness is less likely to occur during injection and foaming of the shaped foaming raw material.

0004 However, the foam mold is made of metal due to its durability and precision. The rotating partition plates are also made of metal from the same point of view, so the rotating partition plates are made of metal. The seal between the partition plate and the mold dividing surface that sandwich it is achieved by the close contact between hard flat surfaces. Become something. Therefore, the liquid foaming material injected into the cavity foams and When the pressure inside the mold increases, a small gap between the rotating partition plate and the mold dividing surface , so that the gas inside the cavity escapes to the outside of the cavity through the gap. Become. Then, the liquid foaming material flows along the gas flow and forms the partition plates 14 and 15. The material of different hardness enters between the edge of the member 16 of different hardness, and furthermore the partitioned cavity surface 12a and the different hardness The liquid also penetrates between the surfaces of the member 16 and is applied to the edge 16a and surface 16b of the member with different hardness as shown in FIG. This forms a hardened part of the foamed material. As a result, the impregnated hardened part The hardness of the different hardness member becomes higher than the expected value, and the hardness of the different hardness bare headrest There is a problem in that it is difficult to obtain the desired soft feeling at the head contact portion.

[0005]

[Problem that the idea aims to solve]

Therefore, in view of the above points, the present invention aims to improve the head contact part of the bare headrest with different hardness. Our objective is to provide a foam mold for bare headrests with different hardness that can provide a soft feel. It is.

[0006]

[Means to solve the problem]

In order to achieve the above object, the present invention provides the following features: A part of the cavity surface is partitioned by providing opposing partition plates. A member of different hardness made of foam of a predetermined hardness can be sandwiched and held on the tee surface by a partition plate. and at least one of the opposing partition plates so that the tip is inside the cavity. The protruding base is sandwiched between the mold dividing surfaces, and the partition plate is rotated when the mold is opened. In the foam molding mold for a bare headrest of different hardness, which can be rotated, the rotating Different hardness among mold dividing surfaces facing each other across a partition plate (hereinafter referred to as a rotating partition plate) An elastic sealing material is provided on the mold dividing surface on the component side to seal between it and the rotating partition plate. It is.

[0007]

[Effect]

The foaming mold can be closed by clamping the rotary partition plate between the mold dividing surfaces when the mold is closed. The elastic sealing material is compressed and a seal is created between the mold dividing surface on the side of the different hardness member and the rotary partition plate. will be sent. Therefore, when molding bare headrests with different hardness, it is difficult to foam the liquid foam raw material. Due to the increased cavity internal pressure, the distance between the mold parting surface and the rotating partition plate is reduced. Even if it spreads, the elastic sealing material restores itself by the amount that spreads, allowing mold separation on the side of different hardness parts. Continue to seal between the surface and the rotating partition plate. Therefore, the type of the different hardness member side The seal between the cutting surface and the rotating partition plate is always ensured, and the gas inside the cavity is Flowing out of the cavity through between the mold dividing surface and the rotating partition plate on the side of the different hardness parts. disappears. As a result, the liquid foaming raw material that was previously generated due to the outflow of gas has been reduced. This prevents impregnation and hardening of the edges or surfaces of members of different hardness.

[0008]

【Example】

Examples of the present invention will be described below. Figure 1 is a sectional view of a foam mold according to an embodiment of the present invention, and Figure 2 is a cross-sectional view of the foam mold. FIG. 3 is a sectional view showing the foam mold in an open state, FIGS. 4 and 5. 3 is an enlarged sectional view of section A and section B of FIG. 3. FIG.

[0009] The foaming mold 27 in this embodiment has a total of four parts: two upper molds 28 and 30 and two lower molds 32 and 34. It consists of a split mold with a product-shaped cavity 36 formed inside. In addition , 38a, 38b, 40a, 40b, 42a, 42b, 44a, and 44b are mold dividing surfaces. The upper molds 28, 30 and the lower molds 32, 34 are connected by hinges 46, 48, 50 so that they can be opened and closed. Ru. The mold dividing surfaces 38a and 38b of the two upper molds have holes 52 for inserting the stay of the insert. , a hole 54 for injection of foaming raw material is formed.

0010 One lower mold 32 has a pair of opposing rotary partition plates 56 and 58 on mold dividing surfaces 40a and 42a. The rotating partition plates 56, 58 are provided at both ends of the rotating partition plates 56, 58. A pair of opposing fixed partition plates 60 and 62 that are substantially perpendicular to each other are erected on the cavity surface 64. There is. A part of the lower mold cavity surface 64 is partitioned by these partition plates. , so that a member 66 of different hardness, which will be described later, is sandwiched and held on the divided cavity surface 64a. It has become. The cavity surface 64a divided by a partition plate is usually a bare head with different hardness. This is the part that forms the head contact surface of the rest. Also, mold dividing surfaces 40a, 40b and 42a, 42 facing each other with rotating partition plates 56, 58 in between. The divided cavities 40a and 42a, which are on the different hardness member side of b, have the divided cavities. Concave grooves 68 and 70 are formed along the edge of the surface 64a, and an elastic sealing material 69 is formed in the concave grooves 68 and 70. , 71 is fitted. The elastic sealing materials 69 and 71 are molded to enhance the sealing effect. It has a shape that slightly protrudes from the dividing surfaces 40a and 42a, and when the mold is closed, the rotating partition plate 56, 58. In addition, the elastic sealing materials 69 and 71 are made of urethane. It is made of elastic material such as silicone rubber or silicone rubber, and is made into a predetermined shape. Even if it is fitted into the grooves 68 and 70 on the mold dividing surface, or an elastic seal is placed in the grooves 68 and 70. The grooves 68 and 70 may be filled with a raw material and formed into a predetermined shape.

[0011] Note that the elastic sealing materials 69 and 71 are applied only to the mold dividing surfaces 40a and 42a that are on the side of the different hardness members. Instead, they may be provided on the other mold dividing surfaces 40b and 42b as well. In that case, members with different hardness Not only the side but also the mold dividing surfaces 40b and 42b on the other side are sealed, allowing liquid foaming to occur. Leakage of raw materials is more reliably prevented. However, on the other hand, the mold dividing surfaces 40b and 42 on the other side Since the gas inside the cavity cannot escape from b, the key where gas easily collects is At the top of the cavity, underfilling due to gas accumulation is likely to occur on bare headrests with different hardness. . Therefore, for the mold parting surface at the top of the cavity, the mold parting surface on the side of the member with different hardness An elastic sealing material 69 is provided only on 40a, and the gas inside the cavity is removed from the other mold dividing surface 40b. It is preferable to prevent underfilling due to the gas accumulation by allowing gas to escape to the outside.

0012 The rotating partition plates 56 and 58 are made of metal plates, and their bases 56a and 58a are mold dividing surfaces. is attached with hinges 72 and 74. And mold dividing surfaces 40a, 40b, 42a, 42 When b is closed, the bases 56a and 58a of the rotary partition plate are sandwiched between the mold dividing surfaces, and the rotating The partition plates are held closer to each other within the cavity as they approach their tips; On the other hand, when the mold is opened, the rotating partition plates 56 and 58 move their tips away from each other. It is made to be able to rotate. Depending on the mold structure, the rotating partition plate may be Only one of the partition plates may be used, and the other may be a fixed partition plate. On the other hand, the fixed partition plates 60 and 62 are formed by foam molding bare headrests with different hardness, which are molded products. The cavity is designed so that no undercut is formed in order to make it easier to remove it from the It is preferable to

[0013] Bare headless with different hardness made using the foam mold of the above example The molding of the sheet is carried out in the same manner as described in the description of the prior art. First, soft polyurethane Rotating a member 66 of different hardness (indicated by the two-dot chain line in Figure 1) made of a tongue foam slab, etc. It is sandwiched between partition plates 56 and 58 and fixed partition plates 60 and 62, and partitioned by those partition plates. In addition to being held on the cavity surface 64a, there is also a buried part for reinforcement and a stay for mounting. Using the hole 52 for inserting the insert 76 (indicated by the two-dot chain line in Fig. 1) and suspend it in the cavity. Then, inside the closed cavity, Hardness member 66 A liquid foaming material that forms a foam with higher hardness, such as polyurethane. The foam raw material is injected through the foam raw material injection hole 54, and the different hardness member 66 and the insert are The pillow part is foam-molded together with the plate 76, and then the foam mold is opened and the rotating partition plates 56 and 58 are inserted. Rotate and remove the molded product.

[0014] Note that the above embodiment deals with the case where the foaming mold 27 is made of metal, but this embodiment The proposed foam mold is not necessarily made of metal, but can also be made of epoxy resin or polyester. A similar structure can be used for resin molds with hardness that can be used as a substitute for metals, such as Stell resin. It is something that

[0015]

[Effect of the idea]

As mentioned above, the foam molding mold for bare headrests with different hardness of the present invention has a rotating partition plate. An elastic sealing material is provided on the mold dividing surface on the side of the different hardness member among the sandwiching and opposing mold dividing surfaces, Enables reliable sealing between the mold dividing surface on the side of different hardness parts and the rotating partition plate when closing the mold. Therefore, when molding bare headrests with different hardness, liquid was formed on the edges and surfaces of the different hardness parts. This prevents the foaming material from impregnating and hardening, giving the head contact area the desired soft feel. Bare headrests with different hardness can be molded.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a foam mold according to an embodiment of the present invention.

FIG. 2 is a perspective view of a portion of the foam mold shown in FIG. 1;

FIG. 3 is a sectional view showing the foaming mold shown in FIG. 1 when the mold is opened.

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

FIG. 5 is an enlarged sectional view of section B in FIG. 3;

FIG. 6 is a sectional view showing a conventional foam mold.

FIG. 7 is a cross-sectional view of a bare headrest with different hardness.

[Explanation of symbols]

36: Cavity 40a: Mold dividing surface on the side of different hardness parts 42a: Mold dividing surface on the side of different hardness parts 56: Rotating partition plate 58: Rotating partition plate 56a: Base of rotating partition plate 58a: Base of rotating partition plate 60: Fixed Partition plate 62: Fixed partition plate 64: Cavity surface 64a: Divided cavity surface 66: Different hardness member 69: Elastic sealing material 71: Elastic sealing material

──────────────────────────────────────────────── ─── Continued from the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location B29K 105:20 B29L 31:58 4F

Claims (1)

[Scope of utility model registration request] Claim 1: Partially partitioning the cavity surface by providing opposing partition plates at a predetermined distance apart from each other at a predetermined portion of the cavity surface, and disposing members of different hardness made of foam having a predetermined hardness on the partitioned cavity surface. At least one of the opposing partition plates is provided so that the tip protrudes into the cavity and the base is sandwiched between the mold dividing surfaces, and the partition plate is used to open the mold. In the foam mold for bare headrests with different hardness, which can be rotated at different times,
A bare headrest with different hardness, characterized in that an elastic sealing material for sealing between the rotating partition plate and the rotating partition plate is provided on the die dividing face on the side of the different hardness member among the mold dividing faces facing each other with the rotating partition plate interposed therebetween. Foam mold for.