JPS6337870B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a metal box that constitutes an outer box of a refrigerator or the like by bending a flat coated steel plate.

(b) Prior art As shown in Figs. 11 and 13, the corners of outer boxes of refrigerators, etc., which are conventionally made of painted steel plates, are provided with a notch 2 in the front flange 1 and stepped around the notch. A corner bead 4 made of synthetic resin is inserted between the stepped part and the cutout part 2 so as to be flush with the front flange 1, thereby connecting the corner part and improving the appearance. was.

In addition, as shown in Figures 12 and 14, adjacent front flanges 1 are simply butted against each other at 45 degrees at the corners, and in order to prevent rust on the cut surfaces and fill in the gaps 5, the paint color is the same as that of the outer box. It is usually sealed with a colored hardening sealant 6.

Therefore, these conventional structures not only impair the aesthetic appearance of the corner portions, but also have the disadvantage that the number of parts increases, which increases the number of man-hours and increases the cost.

(c) Purpose of the Invention The present invention relates to a metal box that constitutes an outer box of a refrigerator or the like by bending a flat coated steel plate, and a corner portion of a front flange that forms the front opening edge of the metal box. The purpose is to improve the aesthetic appearance of the machine and reduce the number of parts and processing man-hours.

(d) Structure of the Invention The metal box of the present invention includes a front flange formed on a flat painted steel plate, a folded flange folded back at a predetermined interval on the back side of the front flange, and a rear flange parallel to both flanges. forming a double flange consisting of the double flange, and forming a notch at an appropriate location of the double flange, bending the painted steel plate into a box shape at the notch portion, and forming a front opening edge with the double flange, Adjacent front flanges are brought into contact and overlapped with each other at the corner portions to form substantially the same plane.

(e) Examples Examples of the present invention shown in the drawings will be described below. Reference numeral 10 denotes an outer box for a refrigerator, etc. The outer box is a flat plate-shaped coated steel plate whose outer surface is coated at least after cutting, and is bent at bending parts 11, 12 and 13, and left and right side walls are formed. 14, 15 and ceiling wall 1
6. Forms a bottom wall 17. A front flange 1 bent inward is provided at the front opening edge of the outer box 10.
A front flange 21 is formed by a folded flange 20 that is continuous with the front flange and folded back with a slight gap 19 on the back surface. A rear flange 23 parallel to the front flange 21 is continuously formed to form a front edge groove 22 for inserting the inner box which abuts the inner surface of the inner box and opens toward the front opening side.

When bending the folding flange 20, since the outer box 10 is made of a painted steel plate, if the bending radius is small, cracking or peeling of the coating will occur, so the bending radius needs to be relatively large. A small gap 19 is provided between the front flange 18 and the folded flange 20 as described above.

Thus, the front flange overlapping portion 24 at the corner portion (corner portion) of the outer box 10 that is bent at the bending portions 11 and 12 is located at one front flange of the notch end edge, as shown in FIGS. 2 to 5. 18 has a small gap similar to the bending radius of the folding flange 20, and is folded back 180 degrees along a predetermined slope line A-A to form a folded piece 25. The other front flange 1 that comes into contact with the folded piece 25
The edge of the notch 8 is stepped along the inclined lines B-B and C-C that are set so as to come into contact with the folded piece 25 when it is bent by the bending part 11 to form a stepped piece 26. do. Said paragraph piece 2
The stepped dimension 6 is set so that when the folded pieces 25 abut and overlap, the adjacent front flanges 18, 18 form substantially the same plane.

FIG. 6 shows an example of actual processing.

That is, a coated steel plate with a notch shape whose developed view of the corner portion 24 is shown in FIG. 5 is flanged using a roll former or the like as shown in FIG. 6a, and the front flange 21 and rear flange 23 are used for insertion into the inner box. A leading edge groove 22 is formed. Next, as shown in FIG. 6b, the notched front flanges 21, 21 are each bent at the bending portion 11, and then processed to be stepped along the inclined lines BB and A-A so as to come into contact with each other. Then, the stepped piece 26 on one side and the folded piece 25 on the opposite side are partially bent, that is, bent by about 90 degrees.

Next, the folded piece 25 bent approximately 90 degrees in the above processing further has a small gap (this gap is equivalent to the small gap 19 formed between the front flange 18 and the folded flange 20). It is bent approximately 180 degrees as shown in Figure c. The back side flange portions of the folded piece 25 and the stepped piece 26 are cut off as shown in FIG. Then the folded part 11
At this point, it is bent approximately 90 degrees as shown in Figure 6d.

In addition, in the notch shape shown in FIG. 5, the tongue piece 27,
28 are provided symmetrically around the bending part 11, located at the bottom of the front edge groove 22, and connected to the left and right side walls 14,
15 and the ceiling wall 16 or the bottom wall 17, and serves to improve the strength of the front edge groove 22 and at the same time to prevent dents etc. from occurring in the cut portion when it is bent at the bending portion 11. are doing. The plane gap E between the tongues 27 and 28 extends to the bending radius of the bent portion 11 when the tongue pieces 27 and 28 are bent.

Therefore, the method of abutting the front flanges 21, 21 at the corners of the front opening edge of the outer box 10 poses a particular problem aesthetically (in terms of appearance), mainly in the areas leading to the ceiling wall 16 and the left and right side walls 14, 15. Therefore, it is desirable to adopt the structure as described above, but the structure shown in FIG. 7 may also be adopted for the bottom wall portion.

This structure adopts an overlapping method of the front flange 21 instead of a corner butting method, and a small gap 19 created between the front flange 18 and the folded flange 23 is created by creating a recess 29 in the folded flange 19 at the part where it joins the front flange 18 on one side. , and the ridgeline 30 of the other front flange 18
In order to prevent deformation of the
It has been established.

FIG. 10 shows an exploded view of the main parts when an insulating box for a refrigerator or the like is constructed using the outer box 10 made of a painted steel plate according to the present invention, and 32 is the rear surface of the outer box 10. A back plate 33 that closes the opening is an inner box made of synthetic resin, and the opening of the inner box has an outwardly bent flange portion 34 that is inserted into the front edge groove 21 of the outer box 10. In addition, the four corner portions of this flange portion are connected to the front edge groove 21 of the outer box 10.
A stepped portion 35 is provided to escape the stepped piece 26 or the flange portion recess 29 located at.

(f) Effects of the Invention Since the metal box according to the present invention is constructed as described above, the abutting portions of the front flange corners are brought into contact and superposition of the folded pieces and the stepped pieces, so that the front flange is substantially on the same plane. In addition, when the inner box flange is inserted into the leading edge groove, appropriate pressure is applied, making it possible to further increase the surface angle.

In addition, since the abutting parts at the corners are abutting and overlapping along the inclined line, even if there is a slight gap at the abutting part, the flat part of the stepped piece, which has the same painted surface as the front flange surface, can be seen. Therefore, there is no particular problem in terms of appearance, and a desirable aesthetic appearance can be maintained.

Therefore, it is possible to eliminate the use of a corner piece or a hardening sealant at the front flange corner abutting portion, which was seen in the conventional example, reducing costs and improving assembly workability. Further, when the folding flange is superimposed on the folding piece, it is necessary to paint the back side of the steel plate, but according to the present invention, such a restriction does not occur.

Furthermore, cut surfaces such as notches and holes that appear within the visible range after processing the box are flat and painted after processing, so there is no need for anti-rust treatment.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a metal box according to the present invention, and FIG.
The figure is an enlarged plan view of the main part of Fig. 1, Fig. 3 is a - sectional view of Fig. 2, Fig. 4 is a slope view seen from the back side of Fig. 2, Fig. 5 is a developed view of Fig. 2, Figure 6a,
b, c, and d are perspective views showing the bending state of the corner part in Fig. 5, Fig. 7 is an enlarged view of the main part of the lower corner part in Fig. 1, and Fig. 8 is a cross-sectional view of Fig. 7. ,
Figure 9 is a slope view seen from the back side of Figure 7, Figure 10
The figure is an exploded perspective view of a refrigerator cabinet using the metal box according to the present invention, FIGS. 11 and 12 are plan views of main parts of a conventional example corresponding to FIG.
14 and 14 are sectional views of essential parts corresponding to - and - in FIGS. 11 and 12. 10...Outer box, 18...Front flange, 20...
...Folding flange, 21...Front flange, 25
...Flap piece, 26...Paragraph piece.

Claims (1)

[Claims] 1 A double flange is formed on a flat painted steel plate, consisting of a front flange, a folded flange folded back at a predetermined interval on the back surface of the front flange, and a rear flange parallel to both flanges, and the double flange a notch is formed at an appropriate location, one front flange of the notch is bent inward along an inclined folding line with a small gap to form a folded piece; A corner portion is formed by forming a step piece along the folding line of the one front flange, bending the painted steel plate into a box shape at the notch portion, and abutting and superimposing the folded piece on the step piece. A metal box body characterized in that adjacent front flanges are substantially on the same plane.