JPH05242764A - Switch with display lamp - Google Patents

Abstract

PURPOSE:To improve the assembling efficiency by positioning the printed substrate of a display lamp securely in a housing. CONSTITUTION:In this switch with display lamp, the inside of the body 4 of a switch main body is divided into connection terminal housings 13 and 14, and a printed substrate housing 50 by a rib 12, and both side surfaces of the printed substrate 23 of a display lamp 24 installed to a reversal handle 21 are fitted to grooves 70 and 71 for positioning of the printed substrate housing 50 respectively so as to position. By holding the printed substrate 23 inside the housing 50 in a stable condition, a fear of floating of the printed substrate 23 is eliminated, even though a tensile force is operated to the printed substrate 23 owing to the weight of the reversal handle 21 and the like, in case of installing the display lamp 24 to the reversal handle 21 and the like, in the assembling process. Consequently, no trouble is generated to the assembly work.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch with an indicator lamp for confirming the operating state of a load.

[0002]

2. Description of the Related Art Conventionally, in a switch with an indicator lamp of this kind, the indicator lamp is turned on when a load current flows. As shown in FIGS. 7A and 7B, this switch has a structure in which the inside of the body 4 of the switch main body is connected to the connecting terminal accommodating parts 13 and 14 and the printed circuit board accommodating part 50 by the rib 12 of the insulating material. As shown in FIGS. 8 (a) and 8 (b), the printed circuit board 23 of the indicator lamp is stored in the printed circuit board storage portion 50 after being divided. In addition, D1 ~ D5
Is a diode, R is a protective resistance, and 26 is a lead wire of an indicator lamp.

[0003]

In such a conventional example, the body 4 of the switch is commonly used as the indicator light for 4A using the current transformer, and the printed circuit board 23 is used.
The storage unit 50 for storing the current is originally designed to store the current transformer. Therefore, the printed circuit board 23 is inserted into the storage portion 50 in an unstable state. Therefore, when the indicator lamp is attached to the reversing handle of the switch in the assembling process, the printed circuit board 23 is pulled up by the weight of the reversing handle or the like and is lifted from the storage section 50, which hinders the assembling work.

The present invention is provided in view of the above-mentioned points, and the printed circuit board of the indicator lamp can be reliably positioned in the housing portion of the body, thereby improving the assemblability. An object of the present invention is to provide a switch with an indicator light.

[0005]

In order to solve the above-mentioned problems, the present invention divides the inside of a body of a switch body composed of a cover and a body into a connecting terminal housing portion and a printed circuit board housing portion by ribs of an insulating material. A switch with an indicator lamp, wherein a printed circuit board for an indicator lamp attached to a reversing handle of the switch is housed in the printed circuit board housing portion, and both side surfaces of the printed circuit board of the indicator lamp are fitted into the printed circuit board housing portion. A positioning groove is formed for positioning in combination.

[0006]

According to the present invention, a positioning groove is formed in the printed board housing provided inside the body so that both side surfaces of the printed board of the indicator lamp are fitted, and the printed board is housed inside the housing by the groove. Since I decided to position with
The printed circuit board can be held in a stable state inside the storage section.
Therefore, when the indicator lamp is attached to the reversing handle of the switch during the assembly process, even if tensile force acts on the printed circuit board due to the weight of the reversing handle, etc., there is no risk of the printed circuit board floating up, and the assembly work is hindered. It will never come.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. First, a specific configuration of the switch-equipped switch main body will be described. In FIG. 3, the switch body includes a body 4 and a cover 5 made of synthetic resin, and an assembly frame 6 for connecting them.
5, the body 4 is divided into a pair of left and right connecting terminal housings 13 and 14 and a printed circuit board housing 50 by a rib 12 made of an insulating material. One connection terminal housing 14 houses a quick-connect terminal composed of the contact terminal block 6, a lock spring 61, and a button 62, and the other connection terminal housing 13 houses a terminal plate 7, a lock spring 8, A connection terminal portion including the button 9 is housed.

Support plate 1 electrically connected to the terminal plate 7
5 is arranged at the bottom of the body, and a substantially U-shaped opening / closing body 17 is swingably arranged on a protrusion 16 formed on the support plate 15. A reversing mechanism configured by a coil spring 63, a reversing handle 21 and the like drives the reversing body 17 in a reversing manner, and an operator 22 protruding from the lower surface of the reversing handle 21 contacts the upper end of the opening and closing body 17, When the handle 21 is turned over, the opening / closing body 17 is moved into a seesaw operation, and the contact
1, 52 are opened and closed. The bottom of the body 4 has an electric wire insertion hole 1 for inserting an electric wire.
0, a release hole 11 for inserting a tip of a driver or the like to press the button 9 is provided.

On the other hand, the indicator lamp 24 is composed of a pair of light emitting diodes LED1 and LED2 (see FIG. 5) and is attached in correspondence with the position of the indicator hole 30 of the reversing handle 21, and the load state is visually recognized from the outside of the handle 21. it can. This indicator lamp 24 is a light emitting diode LED of the display block 2 described later.
1. Mounted on a printed circuit board 25 that integrates LED2,
The printed circuit board 25 is attached to the lower surface of the handle 21. Further, the printed circuit board 25 is provided with a groove portion 28 for drawing out the lead wire 26 of the indicator lamp 24, and the lead wire 26 is fixed to the groove portion 28 by slightly slackening from the soldered portion at the end portion of the lead wire 26. This is to prevent the soldered portion of the lead wire 26 from breaking even when the reversing handle 21 is reversed. The lead wire 26 is connected to another printed circuit board 23 on which the diodes D1 to D5 and the protection resistor R are mounted, and the printed circuit board 23 is housed in the printed circuit board housing portion 50 provided inside the body 4.

That is, the printed circuit board 23 is shown in FIG.
As shown in (b), the opposing side wall 14 of the storage section 50
It is slidably fitted along a pair of left and right groove portions 70 and 71 provided in a and 14b, and is held by the groove portions 70 and 71. Here, one groove portion 70 is provided so as to project from the bottom corner portion 4c of the body 4, and the other groove portion 71 is provided so as to project to the central step portion 4b of the body 4, and these groove portions 7 are formed.
0 and 71 are, as shown in FIG. 1 (a), from the dimensional condition that the heat generation of the resistance and the soldering condition are not so restricted.
The printed circuit board 23 is positioned slightly obliquely.

As described above, the printed circuit board 23 of the indicator lamp 24 is installed in the printed circuit board housing 50 provided inside the body 4.
Since the positioning groove portions 70 and 71 for positioning are formed, the both side surfaces of the printed circuit board 23 are respectively formed into the groove portions 7.
It can be fitted to 0, 71 and can be held in a stable state inside the storage part 50. Therefore, when the indicator lamp 24 is attached to the reversing handle 21 in the assembling process, the printed circuit board 23 is not likely to be lifted up even if a tensile force or the like is applied to the printed circuit board 23 due to the weight of the reversing handle 21 or the like. Can be smoothed.

Next, a circuit diagram of the switch body will be described with reference to FIG. The electrical circuit configuration includes a rectification block 1, a display block 2, and a switch section SW of the opening / closing mechanism section. The rectification block 1 connects the diodes D1 to D4 in a bridge shape, further connects the anode of the diode D5 to the connection point between the cathodes of the diodes D1 and D4, and connects the cathode of the diode D5 between the anodes of the diodes D2 and D3. It is connected to the connection point. The display block 2 is composed of two light emitting diodes LED1 and LED2 connected in parallel in opposite directions and a protection resistor R. The display block 2 is connected to the input / output terminal of the rectification block 1. A choke coil may be used instead of the protection resistor R.

The switch body A is arranged between the power source V and the load L. Now, when the switch unit SW is on, the diodes D1 to D5 are AC power supplies, so that the current in the solid line direction and the current in the broken line flow alternately. That is, in the positive half cycle of the AC power supply, current flows through the diode D1 → D5 → D3 → load L as shown by the solid arrow, and in the negative half cycle, the load L → diode D4 → D5.
→ Current flows to D2. And the diodes D1 to D5
Since the voltage drop of 1 is substantially unaffected by the magnitude of the load current and is substantially constant, a constant potential difference is always generated between a and b. Therefore, since the potential difference between a and b supplies a substantially constant current to the light emitting diodes LED1 and LED2, the brightness of the light emitting diodes LED1 and LED2 does not change so much and the brightness becomes substantially constant.

Here, the forward voltage drop per diode is about 0.7V. Further, the forward voltage drop of the light emitting diode is, for example, about 1.8 V in the case of the gallium / phosphorus element, and about 1.5 V in the case of the gallium / aluminum / arsenic element. Therefore, the light emitting diodes LED1 and LED2 In order to pass a current through, it is necessary to connect three diodes in series. In the present invention, when the diodes D1 to D5 are connected as shown in FIG. 5, the current in the same direction flows through the diode D5 regardless of the direction of the load current, so that a total of five diodes are sufficient.

By the way, in the case of a switch with a built-in semiconductor,
It is conceivable that the element may fail and become non-conductive due to factors such as an inrush current when the power is turned on, an induced lightning surge induced in the power line, and electrostatic discharge received by a person during operation. FIG. 6 shows the current waveforms of the diodes D1 to D5 of the circuit of FIG.
The figure (a) shows the load current, the figure (b) shows the currents of the diodes D1 and D3, and the figure (c) shows the currents of the diodes D2 and D3.
(d) shows the current of the diode D5, respectively. Since the current flows through the diode D5 over both half cycles as compared with the other diodes D1 to D4 through which the current flows only in one half cycle, there is a high probability that the diode D5 fails and becomes non-conductive. When the diode D5 becomes non-conductive, the rectifying block 1 as a whole becomes non-conductive, and the load current all flows to the display block 2. This means that if the load current is within the rating of the light emitting diodes LED1 and LED2, the switch body A can be used without any problem, but if the load current is above the rating, the light emitting diodes LED1 and LED2 fail and the switch body A becomes non-conductive. Become.

In this respect, in the case of a circuit in which a plurality of diodes are simply connected in series and parallel, the probability that all of the diodes D1 to D5 will fail is constant, and if the diode D1 fails, the load current of the light emitting diodes LED1 and LED2 is the same. If the light-emitting diodes LED1 and LED2 fail above the rated value, a half-wave rectified current as indicated by the broken line will flow in the circuit. The rated current of the light emitting diode is several tens of meters.
Since it is as small as A, the load current is more than the rated current in most cases.

In such a state, the load L is adversely affected, and in the worst case, there is a risk that the load L may be broken down or burned out, which is dangerous. However, the circuit configuration shown in FIG. As described above, there is a high probability that the entire switch body A becomes non-conductive, and the failure is performed in a safe mode.

[0018]

As described above, according to the present invention, the printed circuit board housing portion provided inside the body of the switch body accommodates the printed circuit board of the indicator lamp attached to the reversing handle of the switch, and the printed circuit board housing portion is also provided. Since the printed circuit board is stabilized inside the storage part by forming the positioning groove for fitting and positioning both side surfaces of the printed circuit board, the wobbling of the printed circuit board in the storage part during the assembly process and the like. As a result of being prevented from rising, the assembling property is improved, and the working efficiency is improved.

[Brief description of drawings]

FIG. 1A is a plan view showing a state in which a printed circuit board according to an embodiment of the present invention is stored in a storage section. (B) is a longitudinal sectional view of (a).

FIG. 2 is a vertical sectional view of a switch body according to an embodiment of the present invention.

FIG. 3 is an exploded perspective view of the switch body of FIG.

FIG. 4A is a plan view of a body portion of the switch main body of FIG. (B) is a longitudinal sectional view of (a).

FIG. 5 is a circuit diagram of an embodiment of the present invention.

FIG. 6 is an operation waveform diagram of FIG.

FIG. 7A is a plan view of a body portion of a conventional switch body. (B) is a longitudinal sectional view of (a).

FIG. 8A is a plan view showing a state in which a conventional printed circuit board is stored in a storage portion. (B) is a longitudinal sectional view of (a).

[Explanation of symbols]

 2 Display block 4 Body 5 Cover 12 Rib 14 Storage 21 Handle 23 Printed circuit board 24 Indicator light 70 Groove 71 Groove

Claims (1)

[Claims] 1. A switch main body including a cover and a body is divided into a connection terminal storage portion and a printed circuit board storage portion by ribs of an insulating material, and a printed circuit board of an indicator lamp attached to an inversion handle of the switch is provided. A switch with an indicator lamp housed in a printed circuit board housing, wherein the printed circuit board housing is provided with a positioning groove for fitting and positioning both side surfaces of the printed circuit board of the indicator lamp. With switch.