JPH02133786A - Heat-insulated box - Google Patents

Abstract

PURPOSE:To reinforce a fitting between an inner box and an outer box double flange and prevent a leakage of foam heat-insulating material during foaming and charging operation by a method wherein a rear flange close fitting part is arranged at a rear surface flange formed with a predetermined clearance from the front surface flange to form a double flange and then a projecting fitting part and a pushing piece are formed in the inner box flange. CONSTITUTION:In this box, a front surface flange 14a and a rear surface flange 14b are bent back to have a slight clearance therebetween, an R of an extreme end 14c is made large, so that when a double flange 14 is made, a crack of the coated film 9a at the surface of a coated steel plate can be prevented. The rear flange 14b is formed with a rear surface flange close fitting part 14d closely fitted to the front surface flange 14a, resulting in that the double flange 14 is prevented from being deformed in respect to an inserting force when the fitting part 19a of the inner box 19 is inserted into the groove 18. In addition, since the pushing piece 19 is pushed against the close fitting part 14d with its resilient force, it is possible to prevent a leakage of the foam heat-insulating material 20 when it is foamed and charged. In addition, the pushing piece 19c is prevented from being removed out of the groove 18 due to a difference in step between the flange 14b and the close fitted part 14d.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heat insulating box for a refrigerator or the like in which a foamed heat insulating material is foam-filled between an outer box formed by bending a painted steel plate and an inner box.

Conventional technology j4i Conventionally, this type of insulating box body
As shown in the publication, the structure was as shown in FIGS. 5 to 7.

1 is an outer box of the insulating box 2; 3 is a double flange formed at the front opening edge of the outer box 1; It is formed by a flange 3a, a back flange 3b that is folded back to the back side of the front flange 3a, and a rear flange 3C that is continuous with the back flange 3b and forms a groove 4 between it and the back flange 3b. There is. 5 is an inner box molded with resin, 6 is a fitting part formed on the inner box flange 7 at the outer edge of the inner box;
After the inner box 5 is inserted into the groove 4 of the outer box 1 and the inner box 5 is attached, a foam insulation material 8 is foamed and filled between the outer box 1 and the inner box 5. The fitting portion 6 prevents the foamed heat insulating material 8 from leaking to the outside when the foamed heat insulating material 8 is foam-filled.

Problem to be Solved by the Invention However, in the above configuration, the front flange 3a and the back flange 3b are bent in close contact, so when the outer box 1 is formed of a painted steel plate, the tip 3d of this close bent portion is bent by a roll former. Since cracks occur in the coating film during molding, a predetermined interval is set between the front flange 3a' and the back flange 3b' as shown in FIG.
It was necessary to increase the bending radius of '. However, when the low joining part σ of the inner box is inserted into the double flange 3' formed with a predetermined interval between the front flange 3a' and the back flange 3]:/, the insertion force causes the double Flange 3'
If the inner box 5' is deformed back and forth and the inner box 5' is not installed in the specified position, or if the foam insulation material 8' leaks from the fitting part 6' during foam filling, or if the foam insulation material 8' leaks from the groove 4'. Fitting part 6
There was a particular problem when '' was removed.

In view of the above-mentioned problems, the present invention solves the problem that occurs when a painted steel plate is used for the outer box, that is, it strengthens the fit between the inner box and the outer box double flange, and prevents leakage when foam insulation is filled. The purpose is to prevent.

Means for Solving the Problems In order to achieve the above problems, the heat insulating box of the present invention has a front flange formed by bending the front opening edge of the outer box made of a painted steel plate inwardly. A back flange is formed by folding back to the back side of the front flange at a predetermined distance from the front flange, and a back flange contact part is provided on the outer side of the outer box of the back flange and is in substantially close contact with the front flange. A double flange is formed by forming a groove with the back flange, and then the flange, and the fitting part of the protrusion molded on the inner box flange on the outer edge of the inner box is inserted into the groove. In addition, a pressing piece is formed on the outside of the fitting portion to be pressed against the back flange contact portion.

Function: With the above-described configuration, the back flange contact portion is in close contact with the front flange of the outer box, so even if the flange fitting portion of the inner box 5 is inserted into the groove, the double flange will not be deformed and the inner box 5 will not be deformed. Since the pressing piece of the box flange is pressed against the rear flange contact portion, the inner box can be installed firmly, and leakage can be prevented when the foam insulation material is filled with foam.

EXAMPLE Hereinafter, a heat insulating box according to an example of the present invention will be described with reference to the drawings.

In Figures 1 to 4, 9 is the outer box of the insulation box 1o;
Left side plate 11. The right side plate 12, the top plate 13, and a double flange 14 formed at the edge of the front opening are formed by bending a single strip-shaped painted steel plate that has been painted in advance. 9a is the painted film, and 9b is the steel plate body. Outer box 9
The left and right side plates 11 and 12 have a substantially horizontal flange 15 facing inward at the lower end edge and a substantially vertical flange 16 facing inward at the rear end edge.
Furthermore, a downward, substantially vertical flange 1a is bent and formed at the rear end of the top plate 13, and although not shown, the bottom plate is fixed to the flange 16.15 with screws or the like. However, the outer box 9 is constructed by fixing the back plate across the flange 16, 16°6 and 17 with screws or the like.

The double flange 14 is formed by bending the left and right side plates 11, 12 and the top plate 13 to form a front flange 14a and this front flange 14.
A back flange 14b is formed on the four sides of the front flange 14a, which is folded back at a slight distance from the front flange 14a. The arc is made large to prevent cracks from forming at 9a. Reference numeral 14d indicates a back flange contact portion which is in substantially close contact with the back surface of the front flange 14a on the outer side of the outer box 9 of the back flange 14b, and 14e is a rear flange forming a groove 18 between it and the back flange 14b.

Next, 19 is an inner box molded with resin, 19a is an inner box flange formed on the outer periphery of the inner box 19, and 19b is a fitting portion forming a protrusion formed on the inner box flange 19a. A pressing piece 19c is molded on the outside of this fitting portion 19b. Here, a fitting part 19b is formed on the double flange 14 of the outer box 9, and is inserted and fitted into the groove 18, and the pressing piece 19c is pressed against the back flange contact part 14d by its elastic force. With this configuration, the foamed heat insulating material 20 is foamed in the space where the inner box 19 and the outer box 9 are combined.

As described above, according to this embodiment, the front flange 14a
1h with an interval of 40 and 14b on the back side:)
Since the tip part 14c is rounded and rounded, it is possible to prevent the coating film 9a on the surface of the painted steel plate from cracking when processing the double flange 14 by roll former molding. The fitting part 1 of the inner box 19 is formed by forming a back flange contact part 14d that comes in close contact with the inner box 19.
This prevents the double 7 flange 14 from being deformed by the insertion force when inserting 9b into 7+Sff*8. Furthermore, since the pressing piece 19C is pressed against the back flange tight part 14d by its elastic force, it is possible to prevent leakage during foam filling of the foamed t@Netsui A20. By preventing the pressing piece 19c from coming off the groove 18 due to the step, the outer box 9
Due to the pressure during the assembly and pasting of the inner box 19 and the foam filling (120), the fitting part -+9b becomes double flange 14.
It is possible to eliminate the problems caused by falling out of position.

As described above, the present invention has the advantage of forming a front flange by folding the front edge of the outer box made of a painted steel plate inward at the opening edge.
A back flange is formed by folding back to the back side of the front flange at a predetermined distance from the front flange, and a back flange contact part is provided on the outer side of the outer box of the back flange, and the back flange is in close contact with the front flange. A double flange is formed by continuously forming a groove between the rear flange and the rear flange, and a fitting part of the protrusion molded on the inner box flange at the outer edge of the inner box is inserted into the groove. Insert and fit, and then form a pressing piece on the outside of the fitting part to be pressed against the back flange contact part (7'L). Furthermore, even if the inner box fitting part is inserted into the double flange groove, the double flange will not be deformed due to the rear flange contact part.

In addition, since the press BT, )-i is pressed against the back flange and the shield part by its elastic force, it is possible to reliably prevent leakage of the foam insulation. This also prevents problems such as falling off.

[Brief explanation of drawings]

Fig. 1 is an enlarged sectional view of essential parts of a PUP 4i body showing an embodiment of the present invention, Fig. 2 is a front perspective view thereof, Fig. 3 is a perspective view of its outer box, and Fig. 4 is its inner box. , FIG. 5 is a perspective view of a conventional heat insulating box, FIG. 6 is a sectional view taken along line nn in FIG. 6, and FIG. 7 is an enlarged first view of the main part. 9...Outer box, 10...Insulated box body, 14.
...Double flange, 14a...Front flange, 14b...Back flange, 14d...
...Back flange contact area, 14e...Rear flange, 18...Groove, 19...Kawauchi box, 19a...
...Inner box flange, 19b...Mating part, 19
c...Press piece, 20...Foam insulation ladle. Name of agent: Patent attorney Shigetaka Awano and 1 other person C>
+ 咄 4) ・-Ichideaf's deafness qfey-6-Ot5 ()? −−++cy-o-o+z C Castle

Claims (1)

[Claims] An outer box formed by bending a pre-painted band-shaped painted steel plate, a front flange formed by bending inward at the front opening edge of the outer box, and a front surface having a predetermined distance from the front flange. After forming a groove between the back flange that is folded back to the back side of the flange, the back flange contact part formed on this back flange that is in close contact with the front flange toward the outside of the outer box, and the back flange that is continuous from the back flange. an inner box flange formed on the outer periphery of the inner box made of resin, and a protrusion formed on the inner box flange that is inserted and fitted into the groove of the double flange of the outer box. A heat insulating box body comprising a fitting part of a strip, a pressing piece formed on the outside of the fitting part and pressed against a rear flange contact part, and a foam insulation material filled between the inner box and the outer box.