JPS59229167A - Manufacture of heat-insulating box body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a method of manufacturing a heat insulating box for a refrigerator or the like.

[Prior art]

In the conventional manufacturing method of insulation boxes for refrigerators, etc., the first
As shown in the figure, an insertion groove 1 with a U-shaped cross section is formed by folding back the front flange 1a on the back side of the front flange 1a of the outer box 1.
b, and insert the front flange 4a of the inner box 4 together with the dew prevention pipe 2 and the sealing material 3 into this insertion groove lb, and then insert the foam heat insulating material 5 into the space between the outer box 1 and the inner box 4. In this type of product, the dew prevention pipe 2 and the sealing material 3 are inserted into the insertion groove lb of the outer box 1 from the opening of the outer box 1, and then the outer box 1 is inserted into the insertion groove lb. Insert the inner box 4 from the front opening of the box l.
bend inward and insert the front flange 4a into the insertion groove l of the outer box 1.
Since it has to be inserted into the outer box 1 and the inner box 4, it takes more time and effort than necessary to assemble the outer box 1 and the inner box 4, and sealing material is required, which has the disadvantage of increasing the cost. There was.

[Purpose of the invention]

The present invention has been made in order to eliminate the above-mentioned drawbacks, and its purpose is to provide an insulating box body that can be easily assembled and manufactured at low cost, which enables automatic insertion of a dew-preventing pipe and an inner box. The purpose is to provide a manufacturing method.

[Summary of the invention]

That is, a concave part and an inclined part are formed on the front flannon of the inner box (this also includes a condensation prevention pipe on the back side of the 411-face flange of the outer box and a corner wall to which this dew condensation prevention pipe is attached when the inner box is attached). A front convex wall into which the concave part of the inner box fits and a side convex wall where the tip of the slope part is engaged are formed, and after installing a dew prevention pipe on the corner wall of the outer box, the slope of the installed inner box is formed. The condensation prevention pipe is pressed against the corner wall of the outer case by engaging the convex wall on the side of the outer case.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 2 to 4. Reference numeral 6 denotes an outer box having front and back openings formed by bending a metal plate, and a front flange 6a is formed at the periphery of the front opening.

On the back side of the front flange 6a, the tip of the front flange 6a is folded back to form a front convex wall 6b that is substantially parallel to the front flannon 6a. Further, the tip of the front convex wall 6b forms a side convex wall 6C that is substantially parallel to the side wall of the outer box 6, and is exposed at a part of the corner between this side convex wall 6C and the nif portion convex wall 6b. A corner wall 6d to which the sticking prevention pipe 7 is attached from the rear opening of the outer box 6 is about to be formed. Reference numeral 8 denotes an inner box made of synthetic resin that is attached to the rear opening of the outer box 6, in which a freezer compartment 8a and a refrigerator compartment 8b are integrally molded, and a front flange 8C is formed at the edge of the front opening. At the same time, this front flange 8C has a recess 8 that fits into the front convex wall 6b of the outer box 6.
The outer box 6 is secured to the side convex wall 6C of the outer box 6 at the tip d and holds the dew prevention pipe 7 by elastic pressure welding.
An inclined portion 8e is formed which is brought into pressure contact with the corner wall 6d. Reference numeral 9 denotes a foamed heat insulating material that is filled and foamed in the space between the outer box 6 and the inner box 8. Next, the procedure for manufacturing the heat insulating box of the present invention will be explained. First, as shown in Figure 3, the outer box 6
is installed with its front opening facing down, and the dew prevention pipe 7 is inserted from above, that is, from the rear opening of the outer box 6.

Then, the dew formation prevention pipe 7 hits the side convex wall 6c,
As it is further inserted, it comes into contact with the corner wall 6d.

Next, similarly to the dew prevention pipe 7, the inner box 8 is inserted through the rear opening of the outer box 6 as shown in the figure. Then, the inclined portion 8e at the tip of the front flange 8c of the inner box 8 forms the side convex wall 6.
c, and as it is further inserted, the inclined part 8e deforms and climbs over the side protruding wall 6c, and the tip of the inclined part 8e becomes the side protruding wall 6c.
The dew prevention pipe 7 is returned to its original position by the elastic force of the inclined portion 8e of the inner box 8 and brought into pressure contact with the corner wall 6d of the outer box 6. Note that 10 in the figure is a jig.

-6, the space between the outer box 6 and the inner box 8 is filled with the foamed heat insulating material 9 and foamed, thereby completing the method for manufacturing the heat insulating box.

The above completes the manufacturing method of the insulating box, and therefore, according to such a manufacturing method, it is possible to automatically insert the dew prevention pipe and the inner box, without the hassle of using conventional sealing materials. It is not necessary, and can be easily assembled and manufactured at low cost.

〔Effect of the invention〕

As described above, the present invention forms a concave portion and a sloped portion in the front flange of the inner box, and a dew prevention pipe is attached to the back side of the front flange of the outer box when the inner box is attached. After forming a front convex wall into which the corner wall and the recess of the inner box fit, and a side convex wall into which the tip of the inclined part is engaged, and installing a dew prevention pipe on the outer box corner wall,
The dew prevention pipe is pressed against the corner wall of the outer box by engaging the sloped part of the installed inner box with the side convex wall of the outer box, so it is a heat insulator that is easy to assemble and can be manufactured at low cost. A method for manufacturing a box is provided.

[Brief explanation of the drawing]

FIG. 1 is an enlarged cross-sectional view of main parts explaining a conventional method of manufacturing a heat insulating box, FIGS. 2 to 4 relate to an embodiment of the present invention, and FIG. 2 is an external perspective view of a heat insulating box; Figure 3 is a cross-sectional view of the main parts explaining the steps of the manufacturing method of the heat insulating box, and Figure 4 is the sectional view of the main parts.
It is a sectional view taken along the line AA' in the figure. 6... Outer box, 6a... Front flange, 6b... Front convex wall, 6C... Side convex wall, 6d... Corner wall,
7... Dew prevention pipe, 8... Inner box, 8C...
Front flange, 8d... recessed part, 8e... sloped part, 9
...Foam insulation material.

Claims (1)

[Claims] 1. A method for producing a heat insulating box body by attaching a dew prevention pipe and an inner box from the back side of an outer box whose back side is open, and filling and foaming a foamed insulating material between the two boxes. A concave part and an inclined part are formed on the front flange of the inner box, and a condensation prevention pipe is formed on the back side of the front flange of the outer box, and a corner wall and the inner box where this dew formation prevention pipe is attached when the inner box is installed. After forming a front convex wall into which the concave part fits and a side convex wall where the tip of the inclined part is locked, and installing a dew prevention pipe on the corner wall of the outer box, the inclined part of the attached inner box and the outer A method for producing a heat insulating box body characterized in that a dew prevention pipe is brought into pressure contact with a corner wall of an outer box by engaging with a side convex wall of the box. 2. Claim 1, characterized in that a 011 section convex wall approximately parallel to the front flange and a side convex wall approximately parallel to the side wall are formed on the back side of the oil surface flange of the outer box. A method of manufacturing an insulating box. The method for manufacturing a heat insulating box according to claim 1, wherein the dew prevention pipe is held by elastic pressure contact of a sloped portion formed on the left inner box.