JPS6160446A - Manufacture of 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 The present invention relates to a box body such as an inner box or an outer box used for a refrigerator, a showcase, etc., and particularly to a side plate.

When connecting the upper and lower plates by curling, the purpose is to facilitate the curling process and improve the curling strength, regardless of the curling shape.

An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a box-shaped main body made of metal pre-painted or plated material, and consists of a side plate 2 bent into a U-shape, and upper and lower plates 3 and 4. 5 is a first caulking flange provided at the upper and lower ends of the side plate 2, and 6 is a first front flange forming the front edge of the main body 1. 7 is a second caulking flange provided on the upper and lower plates 3 and 4, and 8 is also a second front flange. 9,1o is the 1st. This is a protruding piece formed by extending the end of the second front flange 6°8, and has a length such that when the upper and lower plates 3 and 4 are caulked to the side plate 2, they overlap each other. Further, the first crimping flange 5 includes a mold receiving surface 11 bent outward from the side plate 2 at a substantially right angle, and a mold receiving surface 1 of the mold receiving surface 1.
It is provided with a curled piece 12 bent so as to extend parallel to the side plate 2 again from 1, and a leading piece 13 inclined inward at the tip of this curled piece 12.

Next, the assembly situation in the above configuration will be explained.

The mold receiving surface 11 of the side plate 2 is placed on the mold A, and the upper plate 3 or the lower plate 4 is press-fitted into the mold receiving surface 11 through the elasticity of the leading piece 13 and the curled piece 12, and as shown in FIG. Set both plates 2 and 3 as shown. Thereafter, the mold B is moved in the direction of the arrow M, and both crimping flanges 6.7 are crimped as shown in FIG. To briefly explain this crimping process, the leading piece 13 is bent downward by the rounded part 14 of the mold B, runs along the right side of the second crimping flange end (Fig. 5), and then extends from the second crimping flange Understanding and power =
The two pieces 12 are bent together and caulked into the shape shown in FIG. And the first. The protruding pieces 9 and 1o of the second front flange 6.8 are overlapped and spot welded 15 to complete the assembly. Note that 16 is a plate holder that guides the vertical movement of the mold B and also holds down both plates 2 and 3.

In the above embodiment, the upper and lower plates are fixed to the inverted U-shaped side plates, but the present invention is not limited to this, and the box body may be constructed by fixing the bottom plate to the side plates in the shape of an opening.

In this way, the present invention comprises a side plate having a first crimping flange, and either or both of an upper plate and a lower plate having a second crimping flange, and the first crimping flange is approximately smaller than the side plate. The second crimping flange comprises a mold receiving surface bent outward at a right angle, and a curled piece extending from the mold receiving surface again substantially parallel to the side plate and having a leading piece inclined inward at the tip. It is placed on the mold receiving surface of the first crimping flange, is shorter than the leading piece, and is approximately parallel to the curled piece, and the leading piece is placed between the upper and lower plates and the second crimping flange. It is held in place by the mold receiving surface and the leading piece.
Since curling can be performed using a vertical press and there is no need to perform roll curling, the device is simple and the working time can be shortened.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a box showing an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line nn' in FIG. 1, and FIG. FIG. 4 is an exploded perspective view of the main parts, and FIG. 5 is a sectional view showing the caulking process. 2...Side plate, 3...Top plate, 4...
...Lower plate, 5.7'...1st. Second crimping flange, 6, 8... 1st. Second front flange, 11... Mold receiving surface, 12... Curled piece, 13... Leading piece. Name of agent: Patent attorney Toshio Nakao and one other person Figure 5

Claims (1)

[Claims] The first crimping flange is bent outward from the side plate at a substantially right angle. a mold receiving surface placed on the mold;
The second crimping flange is provided with a curled piece extending substantially parallel to the side plate from the mold receiving surface and having a leading piece inclined inward at the tip, and the second crimping flange is a mold receiving part of the first crimping flange. Placed on the surface, shorter than the leading piece and substantially parallel to the curled piece, the leading piece and curled piece of the first crimping flange and the leading piece of the second flange for crimping are pressed with a mold. . A method for manufacturing a box body, in which the curled piece is aligned with the leading piece of the second flange for crimping, and then both leading pieces and the curled piece are bent.