JPS5855608Y2 - Explosion-proof equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an explosion-proof device comprising an internal device and a case equipped with a knob for controlling the volume of the internal device.

Some explosion-proof equipment cannot be maintained on site, so the internal components are removed from the case fixed on site and taken to a safe area for adjustments.

In most conventional devices of this type, it was necessary to disconnect or connect the wires at the knob portion when removing or installing the internal device.

In addition, other devices require a preliminary step to position the knob at a certain rotation angle before installing the internal device.

An object of the present invention is to provide an explosion-proof device that does not require any special work when installing the internal device into the case or removing the internal device from the case.

FIG. 1 is a partial sectional view showing an embodiment of an explosion-proof device according to the present invention.

In the figure, 1 is the case body, 11 is its front plate (lid), and 2 is an internal device having a rotating shaft 21 connected to the parts to be adjusted (variable resistors, variable capacitors, etc. for setting various values). .

The case body 1 and the front plate 11 constitute a container having a substantially sealed structure, and the inner container 2 is housed therein.

3 and 4 are columnar blocks.

FIG. 2 shows three parts of the columnar block. FIG. 2a is a sectional view, and FIG. 2a is a right side view.

As can be seen from FIG. 2, two radial grooves 31 and 32 are formed in the columnar block 3.

Further, the center portion is fixed to a rotating shaft 21.

Further, a portion of the columnar block 4 is shown in FIG.

FIG. 3A is a side view, and FIG. 3A is a front view.

As is clear from FIG. 3, the columnar block 4 has a columnar projection 41 at an eccentric position.

The diameter of this projection is selected to be slightly smaller than the width of the groove 31, 32 of the columnar block 3.

Returning to FIG. 1 again, reference numeral 5 denotes an operating shaft that is attached to the front plate 11 so as to be rotatable and movable in the axial direction, and 6 is fixed to one end of the operating shaft 5. It's a knob.

The other end of the operating shaft 5 is fixed to the columnar block 4.

Note that in the assembled state, the operating shaft 5 is located on the same central axis as the rotating shaft 21.

Further, 7, 8, and 9 are a spring, an annular ring, and an O-ring, respectively, arranged on the operating shaft 5 between the columnar block 4 and the front plate 11.

Spring 7 is in a compressed state.

Therefore, the columnar block 4 is always pressed against the columnar block 3.

Further, the elastic force of the spring 7 provides a suitable amount of rotational friction when rotating the knob 6.

Furthermore, the O-ring 9 also has a sealing function.

In the device of the present invention configured in this way, the columnar blocks 3 and 4 can be freely attached and detached in the axial direction, so there is no need to disconnect or connect the knob portion when removing or attaching the internal device.

In addition, even if the protrusion 41 does not fit into the groove 31.32 in the initial state of assembly, it will fit in eventually by turning the knob 6.
A stable bonding state between the columnar blocks 3 and 4 can always be obtained.

Therefore, it is not necessary to take the preliminary step of setting the position of the knob at a constant rotation angle in advance.

In addition, some conventional devices use a knob 6 with an indicator to know the rotational position of the volume (inner unit 2), but a similar function is provided by a digital display on the front panel 11. etc., the device of the present invention can also be obtained.

Although the case where two grooves 31 and 32 are formed is shown,
The same applies even if there is one or three or more.

Furthermore, the same effect can be obtained even if the columnar blocks 3 and 4 are alternated.

As explained above, according to the present invention, it is possible to achieve the above-mentioned objectives and realize explosion-proof equipment that is easy to maintain.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view showing an embodiment of an explosion-proof device according to the present invention, and FIGS. 2 and 3 are views showing a columnar block portion. 1...Case body, 2...Inner device, 3,
4... Column block, 5... Operation axis,
6...knobs.

Claims (1)

[Claim for Utility Model Registration] Explosion-proof equipment comprising a case body that houses an internal device and a lid that seals the case body, which has a first columnar shape with at least one radial groove cut in its end surface. a second columnar block, which has an end face opposite to the end face of the first columnar block and is provided with an axial protrusion that fits into the groove of the first columnar block; a rotating shaft that connects either one of the first or second columnar block and the adjusted portion of the internal device; and a rotary shaft that is rotatable through the plate surface of the lid portion and is movable in the axial direction. an operating shaft that is supported by the lid in a state that connects the other columnar block that is not connected to the rotating shaft and a knob disposed on the outside of the lid; a spunong that moves inward of the lid, and when the case body is sealed with the lid, a columnar block connected to the operation shaft is pressed against a columnar block connected to the rotating shaft, and the protrusion Explosion-proof equipment, characterized in that it is configured to fit into the groove.