JPH06209504A - Control box of electric machine - Google Patents

Abstract

PURPOSE:To make a control box light in weight and to easily assemble the control box by a method wherein a coupling means by which a lid body and a support frame are coupled when they are moved in parallel with the bottom face of a box body and a coupling means by which they are coupled when they are advanced toward an opening face are provided. CONSTITUTION:A support frame 30 is attached inside a box body 10 for a control box. The box body 10 is formed in a box shape in such a way that a copper plater is stamped out and bent toward the inside by a press machine and that side plates 15 and bonding margins 12 are assembled by rivets 13. In addition, also a lid body 20 is formed in a quadrangular-box shape in such a way that it is formed of the same material as that of the box body 10 and that its rear surface is opened. When the surface opening of the box body 10 is to be shut, the box body 10 is covered with the lid body 20, the lid body is moved along the opening face, a coupling tongue piece 22 is coupled to a coupling hole 18 and the lid body becomes immovable in the opening direction. In addition, when peripheral edge parts at opposite sides are pressed from the upper part toward the opening part in this state, a small protrusion 23 is coupled to a small-diameter coupling hole 19 made in the box body 10, the lid body cannot be separated as long as the small protrusion 23 is not detached from the small-diameter coupling hole 19. Consequently, the assembly operation of the control box becomes easy and its weight can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control box for accommodating switches and instruments for operating an electric circuit of an electric machine (hereinafter referred to as "electric machine") that operates by electricity, such as machine tools and industrial machines. is there.

[0002]

2. Description of the Related Art A control box for an electric machine as described above is formed by bending a steel plate into a rectangular box shape, and a support frame for supporting control switches and measuring instruments is bolted to the inside of the control box and covered with a lid. It is bolted. Then, the instruments and bilot lamps supported by the support frame are monitored through a window provided in the lid, or switches are operated.

[0003]

However, the weight of transformers, electromagnetic relays, and sequence circuits, which are heavy, have been reduced due to the recent technological advances. That is, electromagnetic relays and sequence circuits have been made into elements, or have been made small on a board. Furthermore, since heavy transformers and solenoids have been made smaller and lighter with the practical use of amorphous alloys, conventional control boxes are significantly heavier than the contents and relatively expensive. There is always something.

[0004]

The present invention has been made in response to the recent progress in electrical technology, and is intended to reduce the weight of a control box and facilitate its assembling work. It is composed of a rectangular box body and a lid body that detachably covers the box body. The support frame is supported inside the box body, and the lid body and the support frame fix the lid body and the support frame to the box body. In that it is composed of first engaging means that engages when moving parallel to the bottom surface of the body, and second engaging means that engages when the lid or support frame advances toward the opening surface of the box body. There are features.

[0005]

First, the support frame is put in the box body and moved in parallel with the bottom surface to engage with the first engaging means, and the second engaging means prevents movement in the opening direction. Then, the lid is moved in parallel with the bottom surface of the opening with respect to the box and locked by the first engaging means. Then, the lid body is locked to the box body by the second engaging means to prevent movement in the opening direction.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In FIG. 1, reference numeral 1 is a control box of the electric machine. The control box 1 has a rectangular box body 10 having an opening on one side and a lid body 20 that can open and close the opening surface. A support frame 30 for mounting electric components is mounted inside the box 10. 21 is an operation window formed in the lid 20,
The operation switches and pilot lamps supported by the support frame 30, or required instruments are exposed there.

The steel sheet used as the material of the box body 10 is a thin cold-rolled steel sheet that has been subjected to surface treatment for rust prevention in advance, and one surface thereof is colored. That is, one surface of the steel sheet is covered with vinyl chloride or other soft resin material containing paint or pigment, and is bent with the coated surface as the surface. The box body 10 is formed by punching such a steel plate into a shape shown in the development view of FIG.
This is bent inward at a position indicated by a chain double-dashed line, and a side plate 15 and a joining margin 12 described later are assembled by four rivets 13 so as not to be disassembled into a box shape. In this development view, 14 is a bottom plate of the box body 10, and 15 is four side plates connected to the four sides thereof. Reference numerals 16 and 16 denote tongue pieces provided on the upper surface of the side plate, that is, on the periphery of the opening of the box body 10, and are formed by bending the upper ends of the side plates inward.

The joint margin 12 is provided with a projecting piece 17 extending upward beyond the peripheral edge of the opening of the box body 10, and a relatively large engaging hole 18 is formed therein to oppose the one surface. The joining margin 12 formed on the surface has a small-diameter engagement hole 19
Are formed.

The lid 20 is also made of the same material as that of the box 10, and is formed in a rectangular box shape whose lower surface is opened. As shown in FIGS. 4 and 8, the peripheral edge of the opening of the box body 10 is a lid body 20.
It has a similar shape smaller than the plate thickness, and when covered with the lid 20, it becomes a rectangular box with less unevenness as a whole. Reference numeral 21 is an operation window formed in the lid body 20, and the edge portion thereof is press-molded to form a gently inclined surface (FIG. 5). As shown in FIGS. 5 and 8, two engaging tongue pieces 22 bent inward from the opening edge are formed on one side surface of the lid body 20 and oppose each other. A small projection 23 is formed on the surface forming the side and is hemispherical.

In order to close the upper surface opening of the box body 10 with the lid body 20, first, the lid body 20 is put on the box body 10 and moved along the opening surface, so that the engaging tongue piece 22 is relatively large. The lid 20 is engaged with the engagement hole 18 and is immovable in the opening direction. That is, the engagement tongue piece 22 and the relatively large engagement hole 18 constitute the first engagement means A. When the peripheral edges of the opposite sides are pressed from above in this state toward the opening surface, the small projections 23 engage with the small-diameter engagement holes 19 provided in the box body 10, and thereafter, the lid body 20. Cannot be separated unless the small projection 23 is removed from the small-diameter engagement hole 19 against the rigidity of the box 10. That is, the small protrusion 23 and the small-diameter engagement hole 19 provided in the box body 10 constitute the second engagement means B.

As shown in FIGS. 5 and 6, the support frame 30 attached to the inside of the box 10 is formed by bending a relatively thick steel plate into a substantially downward U-shape, and one side of the leg portion thereof. Two claw members 31, 31 bent to are projected.
As shown in FIG. 7, the claw member 31 is adapted to be inserted below the hook member 1a, which is formed by punching out the bottom plate 14 of the box body 10 to form a pair. The bottom plate 14 is moved along the bottom surface and locked to the hook member 1a. That is, the claw member 31 and the hooking member 1a constitute the first engaging means A. Further, on the upper surface of the support frame 30, two restraining members 32, 32 protruding laterally are provided, and a small hole 33 is formed therein. The claw members 31, 31 are hooked to the member 1a.
When engaged with the small hole 33, the small hole 33 enters immediately below the tongue piece 16, and the small hole 1b provided therein is aligned with the small hole 33 provided in the support frame 30. 1c is those small holes 1b, 3
When the locking pin 1c is inserted into the small holes 1b and 33, the support frame 30 is fixedly fixed from the position engaged with the hooking member 13. When the opening of the box body 10 is covered with the lid body 20, the locking pin 1c is pressed by the lid body 20 and prevented from coming off. That is,
The lid 20 constitutes the second engagement means B.

Since the control box 1 is constructed as described above, the box body 10 is formed by bending a thin steel plate and joining the joint margin 1 thereof.
Assembling can be performed without using welding or bolts, only by fixing the rivets 13 at four points where the 2 and the side plate 15 are in contact with each other. In order to mount the support frame 30 inside the box body 10, the support frame 30 is slid sideways on the bottom plate 14 of the box body 10, and the claw members 31 formed there are attached to the box body 1.
It suffices to engage the hooking member 1a formed in 0 and insert the locking pin 1c for preventing backward movement. Further, since the weight h of the support frame 30 is supported by the tongue piece 12 formed on the box body 10, it does not act on the locking pin 1c and does not require a large strength. In order to prevent the locking pin 1c from coming off, it is sufficient to simply lock the lid body 20 to the box body 10, and the heavy work such as bolting or welding is not required, and the production can be performed efficiently.

[0013]

As described above, according to the present invention, the steel sheet forming the box body 10 has been subjected to the surface treatment before the press forming, and the production steps for coating after the press forming and welding can be omitted and the production is easy. It takes a short time. Also,
Since locking means is frequently used for fixing the mounting parts such as the support frame to the control box, and bolting is omitted, there is an effect that the assembling work is facilitated and the weight is significantly reduced.

[Brief description of drawings]

FIG. 1 is a front view of a control box showing an embodiment of the present invention.

FIG. 2 is a side view thereof.

FIG. 3 is a front view corresponding to FIG. 1, showing a state in which a lid is removed.

FIG. 4 is an IV-IV sectional view showing an enlarged main part thereof.

5 is a sectional view taken along line VV in FIG.

FIG. 6 is an external view of a support frame that is a main part.

7 is a sectional view taken along line VII-VII in FIG.

8 is an enlarged cross-sectional view of the main part of FIG.

9 is a development view of the box body 10. FIG.

FIG. 10 is an external view of the box body 10.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric machine control box 10 Rectangular box body 20 Lid body 30 Support frame A First engaging means B Second engaging means

Claims (2)

[Claims] 1. A thin steel plate is bent to include a rectangular box body and a lid body that detachably covers the box body. A support frame is supported inside the box body, and the lid body and the support frame are fixed to the box body. First engaging means that engages when the lid or support frame moves parallel to the bottom surface of the box, and second engagement that engages when the lid or support frame advances toward the opening surface of the box. A control box of an electric machine configured by means. 2. The control box for an electric machine according to claim 1, wherein the thin steel plates forming the box body and the lid body are painted or printed on one surface in advance with an elastic paint or colored.