JPH0415568B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a switch device for externally operating a switch connected to an electronic component of a box such as an explosion-proof box that has electronic components built therein.

[Prior Art] Conventionally, in order to externally operate a switch 8 connected to an electronic component 6 built in the main body 2 of an explosion-proof box 1 as shown in FIG. The operating end 8a is connected to the main body 2.
It was attached to the inner wall of the main body 2 so as to face the inner wall of the main body 2, and its operating end 8a was pressed by a switch operating rod 10 inserted into the through hole 2a of the main body 2.

However, in this technique, the pressing length l of the switch operating rod 10 is adjusted, and the switch operating rod 10 and the operating end 8 are
a, and the installation process requires two steps: attaching the switch 8 to the main body 2 using the support rod 9, and inserting the switch operating rod 10 into the through hole 2a. For maintenance and replacement, the lid 3 must be removed each time. As is well known, the explosion-proof box 1 has a main body 2 and a lid 3.
Normally, a flange is formed around the periphery of the switch 8 and the flange portion is firmly tightened with a plurality of bolts 4 to form a sealed box. Therefore, it is not necessary to open the lid 3 each time the switch 8 is maintained or replaced as described above. It's extremely troublesome.

For example, Japanese Utility Model Application No. 49-22471 discloses a switch device for an explosion-proof guide light. However, in this known technique, as described above, the operating rod is simply slidably attached to the cover, and therefore alignment is required.

[Problems to be Solved] Accordingly, an object of the present invention is to provide a switch device in which the position of the switch can be easily adjusted and installed, and therefore maintenance and replacement are easy.

[Means for Solving the Problems] According to the present invention, in a switch device for externally operating a switch connected to an electronic component built inside an explosion-proof box, an operator is attached to one side and the other side is operated by the operator. A switch unit with a switch attached thereto is attached to an opening formed in a recess of the explosion-proof box body, the switch is movably attached to the switch unit, the operator is provided with an operation part protruding to the outside, and The insertion part is inserted into the recess of the explosion-proof box body.

[Explanation of function and effect] Therefore, if you attach the operator to one side of the switch unit in advance, attach the switch to the other side, and then attach the switch unit to the explosion-proof box so that the switch is located at the opening of the explosion-proof box, Well, its installation is simple. The switch wiring work can be done before installation, or after installation by opening the known lid. When assembling the switch unit, the switch is movable and the switch is operated directly by the operator on the switch unit, so the switch can be set in the proper position, there is no need for alignment, and the operation position can be set easily. It's easy to do. Therefore, the operation of the operator is reliable, and the switch unit is easy to assemble.

Further, the switch unit can be attached to the box in a sufficiently explosion-proof structure by surface contact between the recess and the insertion portion, and can be easily attached and detached using bolts, for example. Furthermore, the insertion portion and recess allow the flange for attaching the switch unit to the main body to be shortened. Furthermore, it is possible to provide a plurality of switch units.

[Preferred Embodiment] When carrying out the present invention, it is preferable that the operator is constituted by a switch actuating rod, and that a knob constituting the operating section is provided at the head thereof. It can also be constructed with an actuating bolt, in which case the head constitutes the operating part.

Preferably, the switch is movably attached to the switch unit by screws.

[Examples] Examples of the present invention will be described below with reference to the drawings.

In Figure 1, for example, in an explosion-proof box,
A switch that is turned on and off from time to time is shown, for example, a switch that connects a fuel dispenser's indicator and battery during a power outage. Note that the electronic components inside the box are automatically supplied with power from the battery during a power outage.

In FIG. 1, this switch device has a switch 37 attached to one side and a switch operating rod 3 to the other side.
8 is attached to the opening 21 formed in the main body 20 of the explosion-proof box, and the switch 37 is connected to an electronic component for a display meter (not shown) by electric wiring 7.

An insertion portion 32 is formed on one side of a cylindrical main body 31 of the switch unit 30, a flange portion 33 is formed in the middle, and a rod guide portion 34 is formed on the other side. The insertion portion 32 is formed in the box body 20 and is inserted into a recess 22 having an opening 21.
The box body 20 is bolted to the box body 20 by bolts 40, 40 inserted into the holes a and 33a.

On the other hand, a switch 37 is screwed into the inner hole 35 of the insertion portion 32 of the main body 31, and a switch operating rod 38 is inserted into the rod guide inner hole 36.
Operating piece 37a of switch 37 and switch operating rod 3
A buffer rubber 39 is interposed between the switch 37 and the switch 37 to prevent the operating rod 38 from pressing the switch 37 excessively. Further, a coil spring 41 is interposed between the knob 38a formed on the head of the operating rod 38 and the main body 31, and urges the operating rod 38 outward. A snap spring 42 is wrapped around it.

The present invention is constructed as described above, and when the knob 38a is pressed during a power outage, the operating rod 38 and the buffer rubber 39 are activated.
The actuating piece 37a is pressed through the switch 37.
is turned on, and power is supplied from the battery to the display meter.

The pressing length l of the switch actuating rod 38 is such that the switch 37 is inserted into the insertion portion 32 when the switch unit 30 is assembled.
The depth can be set by screwing into the inner hole 35, and no further adjustment is required.

To attach the switch 37 to the box body 20, attach the switch unit 30 using two bolts 40,
40, it can be easily attached to the box body 20 in one step.

For maintenance and replacement of the switch 37, when the electrical wiring 7 is made longer and is pulled out from the opening 21, it is possible to maintain and replace the switch 37 without removing multiple bolts 4 and stud nuts 5 and removing the lid 3 as in the conventional device (FIG. 3). This can be done very easily by removing the two bolts 40, 40 and removing the unit 30 from the box body 20.

Figure 2 shows another embodiment of the present invention, for example, a switch in an explosion-proof box that almost never turns off once it is turned on. A switch device is shown in a circuit for automatically supplying power to electronic components. Therefore, this switch device is kept in the off state after manufacture and until installation to prevent battery consumption.

In FIG. 2, the switch 43 is turned on when pressed, and the inner hole 44 of the rod guide is formed into a screw hole, into which a switch operating bolt 45 is screwed, and the switch 43 is turned on when pressed. The head 45a of the bolt 45 is prevented from being pulled out by rotating the bolt 45 in the opposite direction by an L-shaped retaining fitting 46 screwed to the rod guide portion 34, and other than this, the structure is the same as that shown in FIG. ing.

In such a configuration, during manufacturing, the switch operating bolt 45 is loosened to turn off the switch 43.
At the time of installation, the switch operating bolt 45 is screwed in, and the operating piece 43a is pressed through the buffer rubber 39 to turn on the switch 43.

This embodiment also has the same effects as the previous embodiment.

[Effects of the Invention] As described above, according to the present invention, the following excellent effects are achieved.

(a) Switch operation can be easily adjusted.

(b) The switch unit can be easily attached to the explosion-proof box body while maintaining its explosion-proof structure.

(c) The switch unit is easy to attach and detach, and maintenance and replacement are easy.

(d) The flange of the switch unit can be shortened.

(e) Therefore, it is possible to install multiple switch units on the explosion-proof box body.

[Brief explanation of drawings]

1 and 2 are side sectional views showing different embodiments of the present invention, and FIG. 3 is an internal plan view of an explosion-proof box showing a conventional device. 20... Main body of explosion-proof box, 21... Opening of main body, 30... Switch unit, 37, 43
...Switch, 38...Switch operating rod, 45...
...Switch operating bolt.

Claims (1)

[Claims] 1. In a switch device that operates a switch connected to an electronic component built inside an explosion-proof box from the outside, the switch unit, which has an operator on one side and a switch operated by the operator on the other side, is inserted into a recess in the explosion-proof box body. The switch is attached to the opening formed in the explosion-proof box, the switch is movably attached to the switch unit, the operator is provided with an operating part protruding to the outside, and the insertion part of the switch unit is inserted into a recess in the explosion-proof box body. A switch device characterized by: