JPH0444183B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a cabinet constructed by bending a strip-shaped coated steel plate into a predetermined shape, such as the outer case of a heat-insulating box for a refrigerator or the like.

(b) Prior Art FIG. 1 shows a perspective view of a cabinet 1 of this type. The cabinet 1 has left and right side surfaces 2, 3 and an upper surface 4 as a horizontal surface formed by bending a pre-painted strip steel plate at bending portions T1 and T2. FIG. 2 shows a rear perspective view of a corner of the front opening edge corresponding to the bent portion T1, and FIG. 3 shows a front view of the corner. At the front opening edge of the cabinet 1, a front flange 5 is formed which is bent inward, and a rear flange 6' which is continuously folded back with a slight interval on the rear surface of the front flange 5 forms a front flange 7. . In addition, the back flange 6' is connected to the left and right sides 2,
3 and the back side of the upper surface 4. When bending the back flange 6', the bending radius needs to be relatively large because the cabinet 1 is made of a painted steel plate, so if the bending radius is small, the coating will crack or peel. arise. For this reason, there is a small gap between the front flange 5 and the back flange 6'.
A rear flange 9 is continuously folded back from the rear flange 6' and forms a front edge groove 8 opening toward the front opening between the rear flange 6' and the rear flange 6'. The rear flange 9 is slightly inclined so as to narrow the entrance of the front edge groove 8, and a flange of an inner box (not shown) is engaged and inserted into the front edge groove 8. The rear flange 6' is cut off at two points N1 and N2 on the connecting part between the adjacent front flange 5 and rear flange 6' when the cabinet 1 is bent as shown in FIG. 9 is further cut away in a wide range from the front and back, leaving only the front flange 5 at the bent portion T1. Here, the two points N1 and N2 are located approximately at the same distance from each other with the bent portion T1 as the center, and will hereinafter be referred to as a proximal portion. The front flange 5 is cut at a portion corresponding to the bent portion T1, and is cut from the approximately proximal portion N1 to the bent portion T.
Fold the part leading to 1 to the back side to form the folded part 10
Further, a stepped portion 11 is formed by slightly recessing rearward along a line extending from the approximately proximal portion N2 to the bent portion T1. Since the bent portion T2 has a similar structure, only the bent portion T1 will be described below.

By bending the cabinet 1, the stepped portion 11 overlaps with the rear of the folded portion 10, and both adjacent portions N1 and N2 come close to each other. Here, since the cabinet 1 is made of a painted steel plate, the bending radius of the bending portion T1 is also relatively large, and the front flange 5
Although there is a small gap between the abutting portions 12 of the cabinet 1, as described above, the stepped portion 11 overlaps with the folded portion 10, producing an appropriate sealing effect. Only the line where the folded part of the folded part 10 and the stepped part of the stepped part 11 are in contact is visible, resulting in a good design.

Conventionally, the configuration was as described above, but in such a configuration, when the cabinet 1 is bent at the bending portion T1 or T2, the bending portions T1 and T2 are formed by a single front flange 5. weak in strength, third
In the figure, the end P portion of the back flange 6' may bulge outward, the abutment portion 12 may be disturbed, and the surface of the front flange 5 may not be flush, resulting in poor assembly work. was significantly worsening.

(c) Object of the invention To improve the design of the front surface corresponding to the bent part and improve the strength against bending with a simple structure in a cabinet constructed by bending a pre-painted steel plate.

(d) Structure of the Invention The present invention provides a cabinet in which left and right side surfaces and a horizontal surface are formed by bending a band-shaped painted steel plate at the bending portion, and in which the portion corresponding to the opening edge of the cabinet is bent inward. A front flange is formed by folding the front flange, a back flange is formed continuously from the front flange and folded back with a slight interval on the back side of the front flange, and the connecting part between the front flange and the back flange is the left and right of the bent part. The first and second proximal parts set at predetermined positions and the front flange are separated at a part corresponding to the bent part and folded back to the back side along a line extending from the first proximal part to the bent part. and a stepped part slightly recessed rearward at the line connecting the second proximal part and the bent part, and the back flange protrudes from both sides and comes into contact with the left and right side surfaces and the back side of the horizontal plane, and is located near the bent part. The cabinet was formed by extending the steel plate up to 300 degrees and cutting it at the bent part to form an abutting part, and by bending the painted steel plate, both adjacent parts came close to each other, and the stepped part overlapped at the rear of the folded part. It is something.

(E) Embodiments Examples of the present invention are shown in FIGS. 4 to 7. Here, the structure of the embodiment is the same as the conventional structure except for the back flange 6, and the same reference numerals in the figures are the same. 4 is an enlarged developed view of the bent portion T1, FIG. 5 is a rear perspective view of the same, FIG. 6 is a front view of the same, and FIG. 7 is a sectional view taken along the line A--A of FIG. 6. To give a supplementary explanation in Fig. 4, the folded part 10 is the first
A folding line 10a that approximately connects the proximal portion N1 and the bent portion T1
The stepped portion 11 is stepped at a line 11a that approximately connects the second proximal portion N2 and the bent portion T1. Also, the back flange 6 has adjacent parts N1 and N2.
and a point corresponding to the bent portion T1 is cut out into a substantially triangular shape, protruding from both sides, and abutting portion 13 that abuts the left and right side surfaces 2, 3 and the back side of the top surface 4.
Approximately triangular projecting portions 14a, 14 whose base is
It forms b.

Here, as shown in FIG. 4, the overhanging parts 14a and 14b have oblique sides corresponding to a line connecting the first proximal part N1 and a point corresponding to the bent part T1, and the second proximal part N2 and the bent part T1. They are formed by receding a little from the line connecting the points. As a result, when each flange is bent, the projecting portions 14a and 14b are attached to the end surface of the folded portion 10 or to the line 11.
a, the overhanging parts 14a and 14b will not come into contact with the folded part 10 or the step part 11 or overlap, and the bending work can be performed smoothly, and the contact parts 13 and 13 can be easily aligned on each side. 2, 3,
4, it becomes possible to touch the back side.

When the cabinet 1 is bent at the bending parts T1 and T2, the step part 11 overlaps with the rear part of the folded part 10 and the overhanging part 14a, and both adjacent parts N1 and N2
are close together. At this time, as mentioned above, the folded part 10
Since the and overhanging portion 14 do not overlap with each other, the step portion 11 can smoothly overlap with the folded portion 10 and the overhanging portion 14a rearwardly without making the step portion 11 large, thereby promoting a sense of discontinuity in the abutting portion 12. This also makes it possible to improve the sealing effect.

In addition, although the appearance is as good as the conventional structure, in the present invention, the contact portion 13 is bent from both sides T1,
It is extended to the vicinity of T2, and the cabinet 1
The force applied when bending is applied to the overhanging portions 14a, 14.
It is applied almost perpendicularly to the cross section of b, which significantly improves the strength and prevents deformation.

At this time, the contact portions 13, 13 are cut at the bent portions T1, T2. Here, if they are continuous, due to the difference in bending radius when bending at the bending portions T1 and T2, the bending portions T1 and T1 near the abutting portion 12,
The appearance may become unfavorable as T2 bulges outward, and the bending work may become troublesome, but in the present invention, the abutting portions 13, 13 are discontinuous at the bending portions T1, T2. Therefore, such inconvenience will not occur.

(F) Effects of the Invention According to the present invention, the appearance of the bent portion of the opening edge of a cabinet constructed by bending painted steel plates is improved, and the number of parts is reduced because no special covering member is required. Ru. Furthermore, since the contact portion of the back flange contacts the vicinity of the bent portion on the back side of each surface, the strength against bending is improved and deformation can be prevented. In particular, since the abutting portion is cut at the bent portion, deformation such as outward bulge of the bent portion does not occur at this portion, and workability is further improved.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the cabinet, Fig. 2 is a rear perspective view of the front corner of a conventional cabinet, Fig. 3 is a front view of the corner, and Figs. 4 to 7 show an embodiment of the present invention. , FIG. 4 is a developed view of the front corner of the cabinet, FIG. 5 is a rear perspective view thereof, FIG. 6 is a front view thereof, and FIG. 7 is a sectional view taken along the line A--A of FIG. 6. T1, T2... bending part, N1, N2... first,
Second proximal part, 1...cabinet, 2, 3...
Left and right sides, 4...Top surface, 5...Front flange, 6
...Back flange, 10...Folded part, 11...
...Stepped portion, 13... Contact portion, 14a, 14b...
Overhang.

Claims (1)

[Claims] 1. In the cabinet 1 in which the left and right side surfaces 2, 3 and the horizontal surface 4 are formed by bending a band-shaped painted steel plate at the bending portions T1 and T2, the portion corresponding to the opening edge of the cabinet is bent inward. a front flange 5 formed by forming a front flange 5, and a back surface that is continuously folded back from the front flange with a slight interval on the back side of the front flange, and whose ends abut against the back sides of the left and right side surfaces 2, 3 and the horizontal surface 4. flange 6, and first and second portions that are the connection portion between the front flange 5 and the back flange 6 and are set at predetermined positions on the left and right sides of the bent portion T1.
The proximal portions N1 and N2 and the front flange 5 are separated at a portion corresponding to the bent portion T1, and are formed by folding back approximately along a line extending from the first proximal portion N1 to the bent portion T1. a stepped portion 11 that is slightly recessed toward the rear along a line connecting the folded portion 10, the second proximal portion N2, and the bent portion T1, and overlaps the rear portion of the folded portion 10; and the back flange 6. contact portions 13, 13 that extend from both sides to a portion corresponding to the bent portion T1 at the end portions of the contact portions, are separated at the bent portion T1, and come into contact with the left and right side surfaces 2, 3 and the back side of the horizontal surface 4; A cabinet characterized by comprising: