JPH0792321B2 - Doors such as refrigerators - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat-insulating door body for a refrigerator, a freezer or the like.

(B) Conventional Technology A conventional door body structure for this type of refrigerator is disclosed in Japanese Patent Laid-Open No. 64-84079. When the door frame is formed by injection molding of plastic material and the groove for mounting the gasket is formed in the door frame, the groove does not have an undercut to prevent the gasket from coming off and the groove does not have an undercut due to the mold. It must form a part, and the structure of said publication forms it.

(C) Problems to be Solved by the Invention In the structure disclosed in the above publication, the wall in which the inlet of the gasket insertion groove 21 is present and the bottom wall of the groove 21 extend parallel to the inside of the door ( 4 or 5), in the undercut structure portion 22, the inside of the door communicates with the entrance of the groove. Therefore, since the door inner plate 14 is in contact with the wall where the groove entrance exists, there is a problem that the heat insulating material 16 leaks unless the entrance of the groove is closed by the gasket 15. On the other hand, if the gasket 15 is closed, there is also a problem that the leg portion is bonded to the heat insulating material 6 and cannot be replaced.

(D) Means for Solving the Problems The present invention is configured such that at least one side of a peripheral frame forming a door body is formed by injection molding and the other side is formed by a plastic material formed by extrusion molding. In a door body of a refrigerator integrally formed with a gasket insertion groove having a portion with and without a gasket removal preventing undercut on the injection-molded side of the refrigerator door body, the door body is integrally formed with the injection-molded frame. The bottom wall of the gasket insertion groove is formed so as to project more inwardly of the door than the wall where the inlet of this groove exists, and the peripheral portion of the door inner plate is placed and abutted on the bottom wall to insulate the inside. It is filled with material.

(E) Operation According to the present invention, even if the gasket insertion groove is integrally formed in the injection-molded frame, the leakage path of the heat insulating material is closed by the inner door plate. Therefore, the gasket is attached to foam the heat insulating material. There is no need to fill it and no special sealant is required.

(F) Example Next, an example will be described with reference to the drawings. 1 is a longitudinal sectional view of a door body 1 of the present invention, FIG. 2 is an exploded perspective view of a frame 2, and FIG. 3 is an enlarged perspective view of an upper side member 3. The door body 1 is formed by combining an outer plate 4 made of a steel plate and an inner plate 5 made of a synthetic resin on a peripheral frame 2 made of a synthetic resin, and a foam insulation material 6 such as polyurethane is filled in the inside by an in-situ foaming method. It is configured as one. 7 is a gasket attached to the frame 2, and 8
Is a decorative plate that is held on the front side of the outer plate 4 by a presser 9 so as to be replaceable.

Both side members 10 and 11 and the lower member 12 of the frame 2 are formed by extrusion molding, and grooves 13 each having an undercut for engaging the gasket 7 are simultaneously formed.

On the other hand, since the upper side member 2 needs to have a recess 14 which serves as a handle when the door 1 is opened and closed, it cannot be formed by extrusion molding but is formed by injection molding. Further, the upper side member 2 must also be provided with a groove 13 for engaging the gasket 7.

The injection molding of the upper side member 2 is performed, for example, by filling a synthetic resin into the space 19 formed by the molds 15, 16, 17 and 18 as shown in FIG. Therefore, since it is necessary to make the undercut of the groove 13, the molds 15 and 18 are formed with the projecting portions 15A and 18A which are combined as shown in FIG. 6, and it is necessary to enable the insertion and removal of these. Wall 20 where the entrance of the groove 13 exists
Since it is necessary to make a pillar 23 for supporting the end 20A of the groove 20, an undercut portion 21 and a portion 22 without undercut corresponding to the pillar 23 are formed in the groove 13, and the surface of the groove 13 facing inward of the door 1 Has an open shape for inserting the protrusion 18A. FIG. 4 shows an enlarged sectional view of the door body 1 of this undercut portion 21, and FIG. 5 shows a sectional view of the portion 22 without undercut.

The bottom wall 24 of the groove 13 of the upper side member 3 is configured to project inward of the door body 1 than the wall 20. Further, the bottom walls 25, 26, 27 of the grooves 13 of the side members 10, 11 and the lower member 12 are also formed to project inward.

Next, a procedure for assembling the door body 1 will be described. First, the insertion protrusions 30 and 30 projectingly formed on both sides of the upper side member 3 of the frame 2 are inserted and engaged in the grooves 13 of the both side members 10 and 11 from the ends as shown by the dotted arrow in FIG. The upper side member 3 and the both side members 10, 11 are combined, and the lower side member 12 is engaged with the lower ends of the both side members 10, 11 to assemble the frame 2. Next, after attaching the outer plate 4 to the frame 2, set it in an appropriate foaming mold, inject the undiluted solution of the heat insulating material 6 into the frame 2, and attach the peripheral flange 5A of the inner plate 5 to each side member 3,10. , 11,12
It is placed on the bottom wall 24, 25, 26, 27 of and is pressed by a mold from above to foam the heat insulating material 6. As a result, the respective members are bonded and integrated.

At this time, since the lateral opening of the groove 13 of the upper side member 3 is outside the inner plate 5 and the groove 13 is outside the foaming space of the heat insulating material 6,
The leakage of the heat insulating material 6 is blocked by the inner plate 5. Therefore, no special sealing material is required, and the gasket 7 need not be attached at the time of foaming.

Although the gasket 7 and the decorative plate 8 are attached after that, they may be attached before foaming. These can be selected as appropriate.

(G) Effect of the Invention According to the present invention, one side of a frame having a recess serving as a handle is formed integrally with a gasket insertion groove by injection molding, and a door inner plate is formed on a bottom wall below the insertion groove. Since the gasket insertion groove is located on the outside of this door inner plate by placing the peripheral part of the, the foam insulation will not leak into the gasket insertion groove even if the frame is formed by injection molding with flexibility in shape. Can be prevented, no special sealing material is required, and there is no restriction that the gasket must be inserted into the groove before foaming of the heat insulating material, and the assembling workability can be improved as the number of parts decreases. .

[Brief description of drawings]

1 is a longitudinal sectional view of a door body, FIG. 2 is an exploded perspective view of a frame, FIG. 3 is an enlarged perspective view of an upper side member, FIG. 4 is an enlarged sectional view of a door body at an undercut portion, and FIG. FIG. 6 is an enlarged cross-sectional view of the door body where there is no undercut, and FIG. 6 is a cross-sectional view of the upper side member forming die. 1 ... Door body, 2 ... Frame, 3 ... Upper side member, 4 ... Outer plate,
5 …… Inner plate, 6 …… Insulation material, 7 …… Gasket, 13 ……
Groove, 20 ... wall, 21 ... undercut part, 22 ... no undercut part, 24 ... bottom wall.

Claims (1)

[Claims] 1. A door frame having at least one side of a peripheral frame having a recess serving as a handle is formed by injection molding, and the other side is formed of a plastic material formed by extrusion molding, and the plastic material is injected. In a door body of a refrigerator integrally formed with a gasket insertion groove having a portion having a gasket removal preventing undercut and a portion having no gasket removal prevention undercut, the gasket formed integrally with the injection-molded frame. A shape in which the bottom wall of the insertion groove is formed so as to project inward of the door body than the wall where the inlet of the groove into which the gasket is inserted is present, and the peripheral portion of the door inner plate is placed and abutted on the bottom wall. A door body for a refrigerator or the like that is filled with heat insulating material.