JPS6149883B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an instrument box used for a power meter or the like, and particularly to an instrument box embedded in a power distribution board.

FIG. 1 shows a conventional power meter instrument box, which includes a cylindrical body 1 having a rectangular cross section and a concave portion 1a concave toward the inner circumference at one end, and a packing 2 on the end face of the concave portion of the body. Base 3 attached to
, an edge 5 fixed to the outer periphery of the other end of the body and fastened to the switchboard 4, and a packing 6 attached to this edge 5.
a cover 8 which is attached through and has a viewing window 7;
It is composed of. Note that the base 3 has a rectangular tray shape and accommodates rectangular packing 2 at the corner.
It is attached to the body 1 by fastening screws 10 between L-shaped metal fittings 9 attached to several locations on the inner surface of the body 1 and taps (not shown) provided on the base 3. Further, the cover 8 is attached to the edge 5 from the front side by inserting long screws (not shown) into the edge 5 at two locations, for example.

Here, the base 3 and the edge 5 are integrally drawn to have an inner circumferential dimension substantially equal to the outer circumference of the body 1, and then divided into two parts to form a base and an edge, respectively. Therefore, as shown in FIG. 2, the body 1 is machined to have a concave portion 1a at one end slightly smaller than the inner circumferential dimension of the base 3, so that it comes into contact with approximately the center of the packing 2. ing. This is because it is preferable to have one end of the body 1 in contact with the center portion of the packing 2 in order to maintain airtightness. As shown in FIG. 2, the fuselage 1 has a recess 1a at one end of a flat plate, which is bent into a rectangular shape and has a lattice plate or the like (not shown) on the end surface 1b.
It is welded together to form a cylindrical shape.

As can be understood from the above explanation, in the case where the edge 5 and the base 3 are integrally drawn and formed and then divided into two parts and one is used as the edge 5 and the other is used as the base 3, the edges and base are each different. Since the inner circumferential dimensions are the same, it is necessary to separately machine the cylindrical body 1 as described above, and it is also necessary to fix this body to the edge 5, which obviously increases the cost. .

The present invention has been made in view of the above-mentioned drawbacks, and it is an object of the present invention to provide an instrument box in which the edge, base, and body are integrally drawn and formed, thereby eliminating the need for a separately machined body.

An embodiment of the present invention will be described below with reference to FIG.
This will be explained with reference to FIG.

In FIG. 3, 11 is a cylindrical body having a flange portion 12 fastened to the switchboard 4 at one end and a hook-shaped bent portion 13 projecting outward at the other end; 14 is the hook-shaped bent portion. The base is attached to 13 with screws 10 through packing 2,
The open end is brought into contact with approximately the center of the packing 2 to improve airtightness. Note that other parts are the same as in FIG. 1 and are designated by the same reference numerals. The cylindrical body 11 having the flange portion 12 and the hook-shaped bent portion 13 and the base 14 are manufactured as follows. That is, as shown in FIG. 4, a flanged bottomed cylindrical body 15 having a bottomed cylindrical part A with a rectangular cross section and a flange part B with an outwardly extended opening is formed by press working. Therefore, it is deep-drawn to the necessary dimensions as appropriate, and is separated as shown by the dashed line at a position slightly inside from the end of the bottomed cylinder part A, and the entire circumference of the open end of the part with the separated bottom is drawn slightly in the outer circumferential direction. It is expanded to form a base 14, and a hook-shaped bent portion 13 that is slightly larger than the outer circumference of the open end of the base 14 is formed around the entire circumference of the other separated open end, as shown in FIG. 3, to form a cylindrical body 11. There is. Note that this invention is not limited to the above-described embodiments; for example, although the cross sections of each component are all rectangular, they may also be circular, and if the dimensions of each component are carefully controlled, The base opening end does not need to be particularly widened, and the same effect can be obtained even if the base opening end is formed into a flange shape, as shown in FIG. 5, and can be modified as appropriate.

Since this invention is made as described above, the flange, base, and body are molded and separated into one body, so it is possible to provide an extremely inexpensive instrument box without requiring a special body or base. It is.

[Brief explanation of the drawing]

1 and 2 are a longitudinal sectional view and a perspective view of the body of a conventional instrument box, FIG. 3 is a longitudinal sectional view of an instrument box according to the present invention, and FIG. 4 is a part of the instrument box used in the present invention. FIG. 5 is a longitudinal cross-sectional view according to another embodiment of the present invention. Note that the same reference numerals in the figures indicate the same or corresponding parts. 11 is a cylindrical body, 12 is a flange portion, 13 is a hook-shaped bent portion, 14 is a base, 15 is a bottomed cylindrical body with a flange, 2 is a packing, 4 is a switchboard, 6 is a packing, 7 is a display window, 8 is the cover.

Claims (1)

[Claims] 1 A step of forming a cylindrical body by integrally molding a flange portion that is detachably attached to a switchboard at one end and a bottomed cylindrical body at the other end, and cutting the bottomed cylindrical body side to a predetermined depth. and a step of widening the open end toward the outer circumference to form a base, and a step of forming a hook-shaped bent portion where the peripheral edge of the base abuts the opening of the cylindrical body cut to form the base. and crimping the peripheral edge of the base to the hook-shaped bent portion through packing.