JPH0346755B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method for manufacturing a refrigerator door that is attached to an opening of a refrigerator and closes the opening so as to be openable and closable.

(b) Conventional technology Conventional refrigerator doors are, for example,
This is shown in Publication No. 38622. That is, the door is constructed by filling an outer panel, a sash, an inner panel, and a space surrounded by these with a heat insulating material. Insulating materials include inserting foamed plastic in advance, or combining a sash and outer panel into a mold and filling it with urethane foam, etc. In either case, the inner panel is insulated. After forming the layers, it is fixed to the sash by screws.

(c) Problems to be solved by the invention In such a structure, after inserting a pre-formed heat insulating material into the assembled outer panel and sash or foaming the insulating material on site, the inner panel is screwed. This required a large number of work steps, leading to a significant drop in mass productivity.

(d) Means for solving the problems In order to solve the problems, the present invention provides an upper mold 4.
The lower mold 2, the door inner member 15, and the door outer member 6 are arranged, respectively, and a heat insulating material 29 is foam-filled between the two members 15 and 16. In that case, the door inner material 15 has a recess 18
This recess 1 is formed in the elastic protrusion 21 of the upper die 4.
8 are fitted to hold the door inner material 15, the stock solution 25 is injected into the door outer material 6, the upper mold 4 is superposed on the lower mold 2, and the gap between the door outer material 6 and the door inner material 15 is A heat insulating material 29 is foamed and filled to integrate both members 6 and 15.

(e) Effects According to the present invention, a heat insulating material is foamed and filled between the door inner member and the door outer member, and the two members are thereby fixed to each other, thereby reducing the work of screwing and the like.
Further, since the door interior member is held in the upper mold by elastic fitting between the elastic protrusion and the recess, attachment and detachment are facilitated and work efficiency is improved.

(f) Examples Examples will be explained with reference to the drawings. FIG. 1 shows a foaming mold 1 used in the present invention. 2 is a container-shaped lower mold having a surrounding side wall 3 and opening upward. 4 is an upper mold, which is rotatably attached to one side of the lower mold 2 at a hinge portion 5. The upper mold 4 is rotated and positioned so as to overlap the lower mold 2. The lower mold 2 has an inner surface shape that follows the outer shape of the door exterior member 6, as shown in FIG. The door exterior member 6 consists of a front plate 7 and a frame-shaped sash 9 whose edge is engaged with and accommodated in a groove 8 in the front edge. A groove 13 is formed in the rear edge of the side wall 10 of the sash 9 for engaging a gasket (not shown) that is open rearward at the base of an inward flange 12 that extends slightly inward. Such a door exterior member 6 is housed in the lower mold 2 with the front plate 7 facing downward and open upward as shown in FIG.

Next, FIG. 3 shows a sectional view of the inner plate 15 as the door interior material. The inner plate 15 is constructed by vacuum forming a thermoplastic resin plate, and has a pair of protruding walls 1 on the inner side of the surrounding flange portion 16 to later form a pocket.
7 is formed, and furthermore, a groove-shaped recess 18 is formed in the inner base of each of the protruding walls 17 and is slightly recessed toward the outside. On the other hand, the lower surface of the upper mold 4 has a shape that follows the shape of the inner plate 15, and a recess 20 for accommodating the protruding wall 17 is formed, and the inner edge of the opening of this recess 20 has a small opening outward. An elastic protrusion 21 made of a rubber material or the like is formed so as to protrude. To temporarily fix the inner plate 15 to the upper mold 4,
When the projecting wall 17 of the inner plate 15 is inserted into the recess 20 of the upper mold 4 and the recess 18 comes into contact with the elastic protrusion 21, the recess is closed due to the elasticity of the elastic protrusion 21 and the inner plate 15 itself. The elastic protrusion 21 is forcefully inserted into the inside of the elastic protrusion 21 .
By this fitting, the inner plate 15 is held on the lower surface of the upper mold 4.

With the door outer material 6 and inner plate 15 arranged in the lower mold 2 and upper mold 4 in this manner, a stock solution 25 of a foam insulation material such as polyurethane is injected from the upper opening into the door outer material 6 from the nozzle 26 into the door. Inject into the external material 6. Thereafter, the upper mold 4 is rotated about the hinge 5 and lowered as shown by the arrow in FIG. 2, so that the step 27 on the lower edge of the upper mold 4 is brought into contact with the upper end of the side wall 3 of the lower mold 2 as shown in FIG. and superimpose it on the lower mold 2. In this state, the flange portion 16 of the inner plate 15 is in contact with the flange 12 of the sash 9, and after the stock solution 25 is injected, a foaming reaction gradually occurs and the gap between the inner plate 15 and the door outer member 6 is filled. The heat insulating material 29 is formed by hardening, and the adhesive force of the heat insulating material 29 connects both 6 and 15. After that, when the upper mold 4 is opened upward, the elastic protrusion 21 will easily come off from the recess 18 due to its elasticity, so if it is lifted from the lower mold 2 and taken out, the refrigerator door 30 as shown in FIG. 5 is completed. do.

In the present invention, the upper mold 4 is rotatably attached to the lower mold 2 by the hinge part 5, and can be superimposed on the lower mold 2 at a predetermined position by simply rotating and lowering the upper mold 4. There is no need to position both dies 2 and 4. Further, the inner plate 15 is easily held on the upper mold 4 by simply fitting the elastic protrusion 21 of the upper mold 4 into the recess 18, and is also easily removed. At this time, recess 1
8 is located at the base of the projecting wall 17, so even if its depth is shallow, the holding force for the inner plate 15 is effectively exerted. That is, since the protruding walls 17 are usually tapered due to die cutting, the closer they get to the tip, the wider the distance between them becomes, and the hardness of the inner plate 15 itself becomes smaller, so the holding force tends to become weaker. It is from. Further recess 1
8 is located at the inner base of the projecting wall 17, so it is less conspicuous than those located on the outside, and does not cause any design problems.
Further, in the present invention, since the inner panel 15 and the door outer member 6 are integrated by the adhesive action of the heat insulating material 29, there is no need to attach them with screws or the like, and the number of work steps can be significantly reduced.

Note that a sealing material is usually provided between the flange 12 and the flange portion 16 to prevent leakage of the heat insulating material 29.

(G) Effects of the Invention According to the present invention, the entire gap between the door exterior material and the door interior material is filled with a heat insulating material, so the heat insulation effect of the door is improved, and at the same time as the heat insulation layer is formed, its adhesive strength Since both members are connected and integrated, work such as screw connection is not required, and the number of work steps can be significantly reduced. In addition, the door interior material can be held in the upper mold simply by elastically fitting the elastic protrusion of the upper mold into the recess formed therein, and it can also be easily removed, which significantly improves work efficiency. It is something that can be done.

[Brief explanation of drawings]

Each figure shows an example of the present invention. Figure 1 is a perspective view of a foaming mold, Figure 2 is a diagram showing the door manufacturing procedure, Figure 3 is a sectional view of the inner plate, and Figure 4 is a perspective view of a foaming mold. FIG. 5 is a sectional view of the door and the foaming mold after foaming of the heat insulating material is completed, and FIG. 5 is an inward perspective view of the door. 2...Lower mold, 4...Upper mold, 6...Door exterior material, 1
5... Inner plate, 18... Recess, 21... Elastic protrusion, 25... Undiluted solution, 29... Insulating material.

Claims (1)

[Claims] 1. A refrigerator door comprising an outer door material, an inner door material, and a foam-filled insulation material between the two members, the door having a front surface, a side surface, and a flange extending slightly inward from the side surface. The outer material is placed on the lower mold with the front surface facing downward, a recess is formed in the door inner material, and the elastic protrusion of the upper mold is fitted into the recess by its elasticity, thereby forming the door inner material. is held on the lower surface of the upper mold, and after injecting the stock solution of the heat insulating material into the door exterior material from the upper opening of the door exterior material, the upper mold is superimposed on the lower mold, and the door exterior material and the door A method for manufacturing a refrigerator door, characterized in that the above-mentioned heat insulating material is foamed and filled between the internal members to integrate the two members.