JPH0692865B2 - Doors such as refrigerators - Google Patents

Description

TECHNICAL FIELD The present invention relates to a door body such as a refrigerator in which a front surface, a peripheral side surface, and an inner flange are integrally drawn by a press or the like.

(B) Conventional Technology A door body such as a refrigerator by a so-called in-situ foaming method in which a urethane resin stock solution is injected and urethane foam is used as a heat insulating material by foaming the stock solution has been conventionally known.
Since urethane foam has adhesiveness in the foaming process, the urethane foam foam-filled in this way adheres strongly to the door body, and the temperature changes due to temperature changes during refrigerator operation or changes in the outside temperature. When it is lowered, the urethane foam locally contracts, and following this contraction, a partial dent is generated on the surface of the door body. In particular, when this dent is formed on the front surface of the door body, the appearance of the product may be significantly deteriorated, and the product value may be lost.

As a method for solving this problem, for example, Japanese Patent Publication No. 60-3863.
There is No. 0 public information. In this product, after pouring the undiluted solution of urethane foam into the door frame, the surface of the frame is rapidly cooled to form a fragile layer on the urethane foam that contacts the frame, and as a result, the fragile layer is broken even if the urethane foam contracts. It is possible to prevent the urethane foam and the frame from being separated from each other to form a dent on the surface of the frame. Also, as shown in Fig. 4, when injecting the undiluted solution of urethane foam, the front surface (3
A polyethylene film (7) for preventing the foaming heat insulating material (5) from adhering to the surface is laid inside a) to achieve the same purpose as in the above publication.

However, for example, as disclosed in JP-A-58-85083, a door using a metal plate such as a steel plate, a front plate, a peripheral side plate, and an inner flange are integrally drawn by a press to form an outer plate. As for the body, as shown in FIG. 4, the front surface (3a) is bent forward by H dimension due to the spring back, and the hollow portion (11) is formed inside. There are drawbacks that occur.

(C) Problems to be Solved by the Invention The present invention is a spring back at the time of molding when using a door outer plate in which the front surface, the peripheral side surface, and the inner flange are integrally drawn by a press or the like in a sectional shape. An object of the present invention is to obtain a door body for a refrigerator or the like in which a cavity is not formed between the front surface and the heat insulating material filled therein even if the front surface is curved forward and peggies are not generated on the front surface.

(D) Means for Solving the Problems The present invention includes a metal door outer plate integrally formed with a front surface, a side surface and an inner flange, and a heat insulating material foam-filled inside the door outer plate. In a door body of a refrigerator or the like, a stretchable sheet member provided inside the front surface of the door outer plate, and a film provided inside the front surface of the door outer plate so as to cover the inner surface of the sheet member. It is equipped with.

(E) Operation Since the present invention is configured as described above, when the door outer plate is drawn in a cross-sectional shape, the front surface is curved forward due to the spring back, and the cavity portion between the front surface and the internal heat insulating material is generated. Since a sheet member is disposed in the inside of the heat insulating material, and the sheet member has elasticity, when the heat insulating material is foam-filled, it is compressed to the front side of the door outer plate by the foaming pressure to foam-fill the heat insulating material. Later, it expands to fill the cavity.

(F) Example In FIG. 3, (1) is a refrigerator main body, (2) and (3) are doors for opening and closing the front opening of the main body, and (2)
Is a refrigerator door, and (3) is a freezer door.

In FIGS. 1 and 2, the door body (2) is formed by integrally drawing a front surface (3a), a peripheral side surface (3b), and an inner flange (3c) of a metal plate such as a steel plate in a sectional shape by a press. Door skin (3)
A door inner plate (4) attached so as to close the opening of the door outer plate, and a foaming heat insulating material such as urethane resin filled in the door outer plate (3) by an in-situ foaming method ( 5), a gasket (G) attached to the inner flange (3c) of the door outer plate (3) together with the door inner plate (4), and inside the front surface (3a) of the door outer plate (3). It is composed of a sheet member (6) which is attached and has elasticity and closed cells, and a film (7) of polyethylene or the like which covers the inside of the sheet member. In the door outer plate (3) integrally formed in a cross-sectional shape, the center portion of the front surface (3a) is curved by a spring back so as to protrude forward by an H dimension.

When filling the foamable heat insulating material (5), first, the door outer plate (3) is formed by drawing into a foaming lower jig (8a).
The sheet member (6) is attached to the inside of the front surface (3a) of the outer panel of the door, and the entire inner side of the sheet member is covered with the film (7). Then, from the nozzle (9) of the foaming machine, the foamable heat insulating material (5)
The undiluted solution (10) is injected and the opening is closed by the upper foaming jig (8b) to solidify the foam. At this time, the curvature of the front surface (3a) is corrected by the foaming upper and lower jigs (8a) and (8b), but is curved again when taken out from the jigs (8a) and (8b).

The sheet member (6) is formed of a stretchable and closed-cell material such as foamed polyethylene. In other words, the sheet member (6) has stretchability and the undiluted solution ( When the heat insulating material (5) is formed of a material that does not adhere to the front surface (3a) after the sheet material (6) permeates the sheet member (6) and solidifies by foaming, the front surface of the door outer plate (3) ( 3a) is curved and a cavity (11) is generated between the surface and the foaming heat insulating material (5), the one compressed by the foaming pressure at the time of foam filling expands and expands. Division (11)
The undiluted solution (10) is formed by forming the film (7) into a thin film such as polyethylene.
Of the sheet member (6a) by adhering or welding a plurality of peripheral portions to the inside of the front surface (3a) while making the flow of the sheet member (6) sufficiently larger than that of the sheet member (6). It prevents the heat insulating material during foam filling from entering between 6) and the inside of the front surface (3a) to adhere to each other.

(G) Effect of the Invention According to the present invention, when using a door outer plate in which a cross section, a peripheral side surface, and an inner flange are integrally drawn by a press or the like to have a cross section, a pedicle is formed on the front surface due to a springback at the time of molding. It is possible to provide a door body such as a refrigerator that does not generate.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a door body according to the present invention, which is taken along line A- of FIG.
FIG. 2 is a sectional view taken along line A, FIG. 2 is a longitudinal sectional view of the same door body at the time of injecting a foaming heat insulating material stock solution, FIG. 3 is a perspective view of a refrigerator, and FIG. 4 is a conventional view corresponding to FIG. (3) …… Door outer plate, (3a) …… Front surface, (3b) …… Circumferential side surface, (3c) …… Inner flange, (6) …… Sheet member,
(7) …… Film.

Claims (1)

[Claims] 1. A door body, such as a refrigerator, comprising a metal door outer plate integrally formed with a front surface, a side surface and an inner flange, and a heat insulating material foam-filled inside the door outer plate. A sheet member provided inside the front surface of the plate and having elasticity,
A door body for a refrigerator or the like, comprising: a film provided inside the front surface of a door outer plate so as to cover the inner surface of the sheet member.