JPS5846975Y2 - Sheet metal box - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a box body made of thin metal plate.

Using a thin metal sheet rolled as a flat plate member,
When forming a container-like box body consisting of a bottom part with a rectangular (including square, same hereinafter) outline and a side wall part extending perpendicularly from the periphery of the bottom part, conventionally, the four corners of a rectangular thin metal sheet material were generally used. Cut out appropriate notches, bend the peripheral edge of the rectangular thin metal plate along the rectangular outline connecting the roots of these notches to form side walls, and braze the joining ends of adjacent side wall parts as appropriate. The joints between adjacent sidewalls may be made by leaving strip-shaped ears of a certain width along the edges of the sidewalls to be joined together, and by folding these ears overlapping each other. Forming a container-like box is being practiced.

However, the container-like box manufactured by such conventional methods has the disadvantage that leakage is likely to occur at the bottom corner where the two side walls meet the bottom.

In view of the above-mentioned shortcomings, the inventor of this invention
Utility Application No. 51-■6815 filed on May 16th (1973)
2-111019), at each corner of a rectangular (including square) thin metal plate, a square area including the corner is defined, and the square area is further divided by a diagonal line passing through the corner. Divide it equally to define two isosceles right triangle areas,
At two hypotenuses that sandwich the corners of the two isosceles right triangular areas, the periphery of the rectangular thin metal plate was cut into a strip along the hypotenuses to somewhat reduce the two isosceles right triangular areas. Two isosceles right triangular regions are formed, and the thin metal plate is folded so as to overlap these two isosceles right triangular regions to form an isosceles right triangular piece, and the isosceles right triangular piece is folded into one of the two isosceles right triangular regions. A thin metal plate box body is proposed, which is formed by overlapping a flat part of an adjacent thin metal plate on one side and bending the remaining peripheral edge of the thin metal plate inward into a band shape.

The present invention has a structure that does not cause leakage at the bottom corners of the box, similar to the thin metal sheet box proposed above. The purpose of the present invention is to provide a thin metal plate box body that is improved so that it is more symmetrical and neatly assembled than the proposed structure.

According to the present invention, such a purpose is to define a square area including each corner of a rectangular (including square) thin metal plate, and define a second corner opposite to the corner of the square area. Then, by drawing a diagonal line and two quarter lines forming an angle of 22.5 degrees from this diagonal line on both sides of the square area, four triangular areas are defined in the square area, and two of them are right triangles. At the shortest side of the area, the thin metal plate is cut into strips along the shortest side to form two right-angled triangular areas that are slightly reduced from the ironworking right-angled triangular area, and further 67 of the two reduced right-angled triangular areas are cut. . Cut out the remaining corners of the thin metal plate along the line connecting the 5° angles to define four right triangular regions with 22.5° angles gathered at the second corner, and The thin metal plate is folded so that two adjacent right triangular pieces overlap each other along the hypotenuses of the two right triangular areas to form two right triangular pieces, and each of these two right triangular pieces is It is closely related to a box body made of a thin metal plate, which is formed by overlapping a flat part of a thin metal plate and bending the remaining peripheral edge of the thin metal plate inward into a band shape.

The present invention will now be described in more detail with reference to the accompanying drawings.

FIG. 1 is a plan view showing a rectangular thin metal plate 1 that is the material of the box.

When forming a box using such a material, first, a square region 3 including the corner 2 is defined at each corner of the box.

The following processing steps are performed for each of these corner areas, but only one of the corner areas will be explained below.

As shown in FIG. 2, the square area 3 further includes a diagonal line 5 with respect to the square area 3 from a second corner 4 opposite to the corner 2, and two quarter lines 6 forming an angle of 22.5 degrees from this on each side of the diagonal line. By subtracting and 7, the four triangular regions 8, 9, io,
It is divided into 11 parts.

As is clear from FIG. 2, in this case triangular areas 8 and 1
1 is a right triangular area.

Then the shortest side of these two right triangular areas, ie side 12
and 13, the shortest sides 14 and 15 of the metal sheet 1 are cut into strips (FIG. 3), thus forming a right triangular region 8.
and 11 are two triangular areas 8' slightly smaller than this.
and 11'.

Furthermore, the remaining corner 19 of the sheet metal 1 is cut off along a line 18 connecting the 67.5 DEG corners 16 and 17 of these two reduced right triangular regions 8' and 11'.

Thus, at the four corners of the thin metal plate 1, there are four right triangular areas 8', 9' with angles of 22° and 5° gathered at the second corner 4, as shown by solid lines in FIG.

10' and 11' are defined.

In addition, when cutting out the actual thin metal plate, part 14
and 15 and part 19 may be cut out simultaneously as a unit, or any parts may be arbitrarily cut out partially or as a whole at the same time depending on the convenience of the cutting process. As shown in FIG. 3, four right triangular regions 8', 9', 10', and 11' are finally defined.

The thin metal plate having four right triangular regions 8', 9', 10', and 11' defined at each corner as shown in FIG. 3 is then shaped at each corner as shown in FIG. Two adjacent right triangular regions along the hypotenuses of the four right triangular regions, namely right triangular regions 8' and 9' and right triangular regions 10' and 1.
1' are folded so that they overlap each other.

In this case, the right triangular regions 8' and 9' are folded along the quadrant 6 that forms the boundary between them so as to protrude into the box to be formed, and the right triangular regions 10 ' and 11' are folded along the quarter line 7 that forms the boundary between them so that they protrude in a chevron shape inside the box to be formed.

Along the diagonal line 5 that forms the boundary between the right triangular areas 9' and 10', the right triangular areas 9' and 10' mutually extend along the diagonal line so as to form a chevron on the outside of the formed box. Bendable against others.

Parallel to such bending, folds 23 and 24 are formed that separate the sheet metal into the bottom part 20 and the side walls 21 and 22,
Furthermore, a fold 25 forming a boundary between the side wall portion 21 and the right triangular region 8' and a fold 26 forming a boundary between the side wall portion 22 and the right triangular region 11' are also formed at the same time.

The lines 5, 6, 7,
As the bending process of the metal thin plate along 23°24.25.26 progresses, the side walls 21 and 22 become connected to each other at the folds 25 and 26 that form the boundary between them.
Inside the right triangular areas 8', 9', 10' and 11
A state is obtained in which two right-angled triangular pieces 27 and 28 consisting of ' are protruded.

The two right-angled triangular pieces 27 and 28 are bent at their bases so as to overlap the flat or side surfaces 21 and 22 of the adjacent thin metal sheets, respectively.

Once the state shown in FIG. 5 has been obtained, the remaining peripheral edge of the thin metal plate 1 is then bent inward at the zones 29 and 30 to form the state shown in FIG.

By bending bands 29 and 30 inward in this manner, right triangular pieces 27 and 28 are stably held in their overlapping positions on side walls 21 and 22, respectively.

When the four corners of the rectangular thin metal sheet are thus formed into the state shown in FIG. 6, the thin metal sheet is formed into one container-shaped box.

As is clear from the box manufacturing process explained above, in this case, the completed box has a bottom part 20 and two side wall parts 2.
The bottom corner 31 where 1 and 22 intersect is defined by a section of continuous sheet metal, so that there is no risk of leakage in this area.

In this case, the structure at the joint between the side walls 21 and 22 is relatively symmetrical to one ridgeline 32 of the box formed by joining the folds 25 and 26 to each other. It exhibits an attractive and stable seam structure including small right-angled triangular pieces 27 and 28.

Furthermore, as is clear from the above description, the box according to the present invention can maintain a strong assembled state without the need for taming, adhesives, or the like.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a rectangular thin metal sheet material for manufacturing a box according to the present invention, and FIGS. 2 to 6 are diagrams showing processing steps performed on each corner of the metal thin sheet material. be. 1 - thin metal frame, 2 - corner, 3 - square area, 4 - second corner, 5 - diagonal, 6, 7 - quarter line, 8, 9, 10.11 -
Triangular areas, 8', 9', 10', 11' - Reduced right triangular area, 12° 13 - Sides of triangular areas 8 and 11, 14.15 - Strip cutout, 16.17 - Right triangular area 8 ', 11' corner, 18 - line connecting corners 16 and 17, 19 - corner cutoff, 20 - bottom, 21.22 - side wall, 23, 24, 25. 26 - fold, 27. 28 - right triangular piece, 29. 30 - bending zone, 31 - bottom corner, 32 - one edge of the box.

Claims (1)

[Scope of utility model registration request] At each corner of a rectangular (including square) thin metal plate, define a square area including that corner, and from a second corner opposite to the corner of the square area, draw a diagonal line and a diagonal line of the square area. By drawing two quarter lines at 22.5° on both sides, four triangular regions are defined in the square region, and the shortest sides of two of the right triangular regions are connected to the thin metal plate. are cut into strips along the shortest side to obtain two right triangular regions that are somewhat reduced from the ironworking right triangular region, and further 67 of the two reduced right triangular regions.
．． Cut out the remaining corners of the thin metal plate along the line connecting the 5° angles to define four right triangular regions with 22.5° angles gathered at the second corner, and Fold the thin metal plate so that two adjacent right triangular pieces overlap each other along the hypotenuse of the right triangular area to form two right triangular pieces, and fold each of these two right triangular pieces into the metal to which it is adjacent. 1. A box made of a thin metal sheet, characterized in that it is formed by overlapping a flat surface of the thin metal sheet and bending the remaining peripheral edge of the thin metal sheet inward into a band shape.