JPS5913590Y2 - insulation door - Google Patents

Description

[Detailed description of the invention] This invention relates to a heat insulating door for refrigerators, etc., and its purpose is to provide a door frame with a flange on the inner peripheral edge of the opening on the top surface, and place the undiluted solution in the door frame. A heat insulating member is formed by injecting and foaming and solidifying, and a sheet having dimensions approximately equal to or larger than the inside dimensions of the door frame is placed within the door frame, and before the stock solution solidifies, By forming an uneven part on the upper surface of the heat insulating member by pressing the stock solution through the sheet with a molded member having an uneven part, the strength is extremely high, and when the stock solution is pressed by the molded member, the sheet is It is an object of the present invention to provide a heat insulating door which can prevent undiluted solution from leaking from a flange portion of a door frame due to displacement, and can also prevent undiluted solution from adhering to a molded member.

An embodiment in which the present invention is applied to a heat insulating door of a refrigerator will be described below with reference to the drawings.

First, the heat insulating door will be described according to FIG.

Reference numeral 1 denotes a flat box-shaped door frame having an opening 2 on the upper surface, which is the inner surface, and a flange 3 oriented inward is formed at the inner peripheral edge of the opening 2.

Reference numeral 4 denotes a plastic door inner plate fixed to the inner surface of the door frame 1, which is fixed with screws to a mounting hole 3a formed in the flange part 3, and has a protrusion 5 for forming a door pocket. etc. are integrally molded.

Reference numeral 6 denotes a magnetic gasket, which is disposed on the inner peripheral edge of the door frame 1 with a mounting tongue 6a sandwiched between the door inner plate 4 and the flange portion 3.

7 is a handle fixed to one side of the front side of the door frame 1.

Reference numeral 8 indicates a heat insulating member made of foamable urethane disposed within the door frame 1 and having an uneven portion 8a on the upper surface, and reference numeral 9 indicates the adhesion between the heat insulating member 8 and, for example, foamable urethane whose outer peripheral portion is sandwiched between the flange portion 3. This is a sheet called kraft paper, which has good properties and high tensile strength.

Now, the process of forming the heat insulating member 8 will be described with reference to FIGS. 2 and 3.

First, as shown in FIG. 2, the door frame 1 is placed on the conveyor 10 with its opening 2 facing upward.
A stock solution 11 of foamable urethane, which is a foamable heat insulating material, is injected into the door frame 1, and then the sheet 9 is stored inside the door frame 1 through the opening 2.

The sheet 9 is, for example, lQm larger than the inside dimension of the door frame 1.
It is set in a rectangular shape with a size of about m, and when it is housed inside the door frame 1, its peripheral portion comes into pressure contact with the inner surface of the door frame 1.

Next, when the foaming of the stock solution 11 reaches a predetermined state, the third
As shown in the figure, a molded member 13 having a pressing uneven portion 12 formed on its lower surface is lowered by a pressing device (not shown).
The uneven portion 12 is inserted into the door frame 1 through the opening 2.

Then, as the foaming progresses, the stock solution 11, which has a mountain-shaped shape with a swollen center, is pressed by the uneven portions 12 and spreads around the entire circumference of the door frame 1.

After that, when the molding member 13 is raised, the stock solution 11 expands while pushing up the sheet 9. When it expands to a height approximately equal to the flange portion 3, foaming is completed, and the peripheral edge of the sheet 9 is expanded by the foaming of the heat insulating member 8. It is pressed against the inner surface of the flange portion 3.

Note that once the surface of the stock solution 11 in the middle of foaming is shaped into an uneven surface by the molding member 13, even if the molding member 13 is removed, the surface of the stock solution 11 will maintain its uneven surface shape and expand. By performing the above-described pressing by the molding member 13 multiple times during the foaming process, uneven portions 8a are well formed on the upper surface of the heat insulating member 8 when foaming is completed.

As a result, the sheet 9 also has uneven portions 8a on the upper surface of the heat insulating member 8.
The uneven portion of the sheet 9 and the uneven portion 8a of the heat insulating member 8 can increase the overall strength.

By the way, if the undiluted solution 11 is pressed through the sheet 9 by the uneven portion 12 of the molded member 13 before the undiluted solution 11 solidifies, the sheet 9 will shift inward, causing the flange portion of the sheet 9 and the door frame 1 to However, in this embodiment, as mentioned above, the dimensions of the sheet 9 are set to be about 1Q mm larger than the inside dimensions of the door frame 1. L + 10) mm, even if the sheet 9 shifts inward due to pressure from the uneven portion 12 of the molded member 13, the shift can be sufficiently absorbed, and the peripheral portion of the sheet 9 can be securely attached to the 7-lung portion 3. It can be pressure-welded by polymerization, and leakage of the stock solution 11 from the flange portion 3 can be reliably prevented.

In addition, the flange portion 3 has a mounting hole 3 for screwing the door inner plate 4.
Openings such as a are formed, and if the foaming urethane leaks from these openings and solidifies, the removal work becomes extremely troublesome. This method involves pasting tape or injecting putty or hot-melt resin to close the hole and then injecting the foaming urethane stock solution, which had the disadvantage of poor workability, but in this example, as described above, When the sheet 9 is pressed against the inner surface of the flange portion 3 by the foaming pressure of the stock solution 11,
Since the mounting hole 3a and other openings formed in the flange portion 3 are closed to prevent foaming urethane from leaking, work such as pasting adhesive tape is not required, resulting in extremely high workability. .

Furthermore, since the handle 7 is attached to the front side of the door frame 1, conventionally, when attaching the inner door plate after forming a heat insulating member on the inner surface of the door frame, it is difficult to place the handle downward on the workbench. There was a drawback that the door frame was easily bent, but in this example, sheet 9
is in close contact with the heat insulating member 8 and the peripheral edge is in pressure contact with the flange portion 3, so when the door frame 1 is bent and deformed, a tensile force is applied to the sheet 9, and the tensile force of the sheet 9 is This prevents the door frame 1 from bending and deforming, and together with the formation of the uneven portions 8a on the heat insulating member 8, the strength of the door frame 1 can be made extremely high.

In addition, according to this embodiment, the uneven portion 12 of the molded member 13
Since the undiluted solution 11 is pressed through the sheet 9, the undiluted solution 11 does not adhere to the uneven portions 12 unlike when the undiluted solution 11 is directly pressed by the uneven portions 12.
There is no need to clean the uneven portion 12.

The present invention is not limited to the embodiments described above and shown in the drawings, but may be modified as appropriate without departing from the spirit, such as being applicable not only to insulating doors of refrigerators but also to insulating doors in general. It can be implemented.

As explained above, this invention has extremely high strength.
The sheet can prevent the undiluted solution from leaking from the flange portion of the door frame due to displacement of the sheet when the undiluted solution is applied to the heat insulating member by the molded member, and the sheet can also prevent the undiluted solution from adhering to the molded member. It is possible to provide an insulated door that has practical effects.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to a heat insulating door of a refrigerator, and FIG. 1 is a longitudinal sectional view, and FIGS. 2 and 3 are action explanatory views. In the drawings, 1 is a door frame, 2 is an opening, 3 is a flange, 4 is a door inner plate, 8 is a heat insulating member, 8a is an uneven part, 9 is a sheet, 1
1 is a stock solution, 12 is an uneven portion, and 13 is a molded member.

Claims (1)

[Scope of utility model registration request] A door frame having an opening on the top surface and a flange on the inner peripheral edge of the opening, a heat insulating member formed by injecting an undiluted solution into the door frame and foaming and solidifying it, and disposed within the door frame. A molded member having a high tensile strength sheet having dimensions substantially equal to or larger than the inner dimensions of the door frame and whose peripheral edge portion is brought into pressure contact with the inner surface of the flange portion due to foaming of the stock solution, and a molded member having an uneven portion. an uneven part formed on the upper surface of the heat insulating member and the sheet so as to be in close contact with each other by pressing the undiluted solution through the sheet, and a door fixed to the opening of the door frame so as to close the opening. An insulated door comprising an inner panel.