JPS6245392Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a switchgear with an indicator light, which is provided with an indicator light for checking the operating status of a switch.

Conventionally, this type of switchgear has a built-in lamp circuit in addition to a basic switch circuit, and the operating status of the switch can be confirmed by displaying it on the display window by turning on or off the neon lamp that is the light source. A limit switch with an indicator light has been put into practical use.

Its concrete structure is that a neon lamp and a resistor are connected in series and installed inside the lamp holder.
A lead wire is drawn out from the lamp holder from both poles, and is connected to one end of a pair of conductive compression coil springs attached to the inside of the lamp holder via washers. Further, the other end of the compression coil spring is configured to come into pressure contact with a normally closed or normally open terminal of a switch constituting the switch circuit, thereby establishing an electrical connection between the switch circuit and the lamp circuit.

To attach the compression coil spring to the lamp holder, first fix one end of the compression coil spring to a washer by bending its claw, and then solder the lead wires drawn out from the neon lamp and resistor to the washer. In addition, the washer was fixed to the lamp holder with adhesive. However, this complicates the assembly process and makes it difficult to install the compression coil spring vertically to the lamp holder.If the compression coil spring is installed at an angle, the other end of the compression coil spring and the switch There was a problem that the contact with closed or normally open terminals deteriorated.

This idea was created in view of the above problems.
An object of the present invention is to provide a switchgear with an indicator light, in which a compression coil spring is directly attached to a lamp holder and a washer is removed, thereby reducing the assembly process and improving the contact between the compression coil spring and a switch terminal.

Next, the present invention will be explained with reference to the accompanying drawings, which are one embodiment.

In the drawing, 1 is an aluminum die-cast case body that forms the main body of the switch case A, 2 is a case cover made of synthetic resin that is attached to the case body 1 via a sealing member 3, and 4 is a case body built into the case body 1. This micro switch 4 is equipped with a pair of normally open terminals 5, 5 and normally closed terminals 6, 6 on its outer side, and is operated by pressing a push button 7 by an actuator 8. It is something that will be done. Reference numeral 9 denotes a substantially rectangular recess formed on the inside of the case cover 2 for mounting a lamp holder, and at the bottom of this recess 9 is a display window 10 that is translucent and is diamond-cut from the inside. , 11 are formed.
Reference numeral 14 denotes a lamp holder made of a flexible member made of rubber or nylon and removably fitted into the recess 9. The lamp holder 14 includes a resistor mounting portion 15 and one of the display windows. A lamp mounting portion 16 is provided at a position corresponding to 10 or 11. The lamp holder 14 has a lamp 21 mounted on its lamp mounting part 16 and a resistor 22 mounted on its resistor mounting part 15, and is wired. 23 is connected and fixed to the protrusion 24 so as to stand upright. That is,
The tightly wound one end 23a of the compression coil spring 23 has a bent portion 23b bent radially inward as shown in FIG. 5, and the tip of the bent portion 23b extends along the axis. An extended portion 23c is formed. On the other hand, the protrusion 24 of the lamp holder 14 has a through hole 24 in its center that penetrates from front to back.
a, and has a cut groove 24b extending from the through hole 24a to the outer peripheral surface. When one end portion of the compression coil spring 23 is press-fitted around the protrusion 24, the extension portion 23c is inserted into the through hole 24a, the bent portion 23b is inserted into the cut groove 24b, and the one end portion 23a of the compression coil spring 23 is inserted into the through hole 24a. Since it is tightly wound, it is firmly fixed perpendicularly to the lamp holder 14. And through hole 24a
The extension portion 23c of the compression coil spring 23 inserted through is soldered to the lead wires 21a and 22a of both poles from the lamp 21 and the resistor 22, so that the compression coil spring 23 is prevented from coming off from the lamp holder 14.

The lamp holder 14 assembled as described above is placed in the recess 9 of the case cover 2, and the lamp 21 is placed in the display window 11.
After attaching the case cover 2 to the case body 1, attach the coil springs 23, 2.
The free ends of 3 are press-fitted into normally open terminals 5, 5, and the microswitch 4 and the lamp circuit are electrically connected.

Next, the operation of the limit switch with indicator light constructed as described above will be explained.

As shown in FIG. 1, when the push button 7 is not pressed and is in the OFF state, the movable contact of the micro switch 4 is in contact with the normally closed fixed contacts 5b, 5b, so the lamp 21 is always lit and the lower The display window 11 emits light to indicate that the microswitch 4 is in a non-operating state.

On the other hand, when the push button 7 is pressed, the movable contacts of the micro switch 4 change to the normally open fixed contacts 5a, 5a.
The lamp 21 turns off. By turning off this lamp 21, the micro switch 4
It can be easily determined that the power supply current is being applied to the electrical load 25 that is controlled by the ON-OFF operation.

In the above embodiment, the micro switch 4
The lamp 21 is turned on when it is in the OFF state, but in order to turn it on in the opposite direction, attach the lamp holder 14 upside down to the case cover 2, and then attach the coil spring 2
3 and 23 are connected to the normally closed terminals 6 and 6, the display window 10 emits light to indicate that the micro switch 4 is in the ON state.

Note that the display windows 10 and 11 may not be integrally formed with the case cover 2, but may be attached separately, or may have various shapes. Further, the display windows 10 and 11 may be provided in parallel in the horizontal direction. In this case, it goes without saying that the arrangement of the lamp 21 with respect to the lamp holder 14 is also changed.

As is clear from the above explanation, the switchgear with indicator light of the present invention has a bent part and an extension part formed at one end of the compression coil spring that connects the switch circuit and the lamp circuit. Fit it into the protrusion of the lamp holder, insert the bent part into the cut groove of the protrusion, and insert the extension part into the through hole of the protrusion.
Since this extension part is directly electrically connected to both poles of the light source, the number of parts and work steps are reduced compared to the conventional method using washers, making assembly work easier. Since the part is fitted around the protrusion and is prevented from rotating by the cut groove, it is fixed to the protrusion without tilting or rattling. Therefore, there is an effect that the contact between the compression coil spring and the normally closed or normally open terminal of the switch is improved.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view of a limit switch with an indicator light, which is an example of a switchgear with an indicator light according to the present invention, and Figs. 2 to 4 are a front view, rear view, and plan view of a lamp holder, respectively, and Fig. 5 6 is an exploded perspective view of the compression coil spring and the protrusion, and FIG. 6 is a circuit diagram. 1...Case body, 2...Case cover, 4...
...Switch, 5...Normally open terminal, 6...Normally closed terminal,
9... Recess, 10, 11... Display window, 14... Lamp holder, 21... Lamp, 23... Compression coil spring, 23a... One end, 23b...
Bent part, 23c...Extension part, 24...Protrusion, 24
a...Through hole, 24b... Cut groove.

Claims (1)

[Claims for Utility Model Registration] (1) A switch case consisting of a case body and a case cover, and a switch housed within the case body, each having a pair of normally open terminals and a normally closed terminal. , a light-transmitting display window provided on the case cover; a lamp holder fitted inside the case cover and having a built-in light source corresponding to the display window; and one end portion of the lamp holder. In a switchgear with an indicator light, the switchgear includes a pair of electrically conductive compression coil springs that are fixed to the sides and are respectively connected to both poles of the light source, the other end of which is in pressure contact with the normally open terminal or the normally closed terminal. , a protrusion having a through hole in the center and a cut groove extending from the through hole to the outer circumferential surface is integrally provided on one side of the lamp holder; forming a bent part bent inward in the radial direction and an extension part whose tip is extended along the axis, and the extension part is inserted into the through hole and connected to both poles of the light source, An opening/closing device with an indicator light, characterized in that the bent portion is inserted into the cut groove, and one end of a compression coil spring is fitted and fixed around the protrusion. (2) Utility model registration claim 1, characterized in that the portion of the compression coil spring that is fitted into the protrusion of the lamp holder is tightly wound.
Switchgear with indicator light as described in section.