JPS5826432Y2 - switch - Google Patents

Description

[Detailed explanation of the idea] This proposal relates to a switch with measures to prevent electric shock.

If there is a current leakage in the switch of an electrical appliance, there is a risk of electric shock when operating it.

For example, if there is a leak in a ventilation fan, you may get an electric shock when you pull the switch pull cord, so bathroom ventilation fans that are used in particularly humid areas must take complete measures to prevent electric shock.

This proposal was made in view of this point, and will be explained based on the following diagram. 1 is a pull switch used in a ventilation fan, and a micro switch 3 is installed inside the case 2.
When an operating member 4 made of a metal plate is inserted so as to be movable up and down, a leaf spring 5 is interposed between the operating member and the microswitch 3, and the operating member 4 is pulled down by a drawstring 6.
The protrusion 7 provided on this operating member presses the leaf spring 5,
This leaf spring pushes the push button 8 of the microswitch 3,
I'm trying to close that contact.

A pair of bent pieces 9, 9 are provided on both side edges of the operating member 4 so as to face each other, and a coil spring 10 is wound around a shaft installed between both bent pieces. One end of the shaft is in elastic contact with a sliding piece 11 that is loosely fitted onto the shaft.

The tip of this sliding piece is bent into a hook shape, and the bent tip comes into elastic contact with the bottom surface of the case 2 by the force of the spring 10.

A heart-shaped guide portion 12 and a stepped portion 13 for guiding the sliding piece 11 are formed on the bottom surface of this case.

Therefore, when the operating member 4 is pulled downward by the drawstring 6, the sliding piece 11 moves downward along the stepped portion 13 and the guide portion 12 as indicated by the dotted arrow, and hits the stopper 14.

When the drawstring is loosened here, the operating member 4 is pulled up by a spring on the side of the ventilation fan body (not shown), and the guide portion 1
The tip of the sliding piece 11 is inserted into the recess 15 formed at the lower end of the sliding piece 2 and locked.

At this time, the projection 7 of the operating member pushes the push button 8 of the microswitch via the leaf spring 5, closing the contact and rotating the fan motor of the ventilation fan.

When the drawstring 6 is pulled again, the sliding piece 11 moves into the recess 1 of the guide part.
5, move upward as shown by the dotted arrow, and return to the original state.

At this time, the contacts of the microswitch 3 are opened.

The proximal end of the leaf spring 5 is fixed to the bottom of the case 2, and a metal piece 16 is integrally formed with the leaf spring and is in constant elastic contact with the operating member 4. One end is connected to a ground wire 17.

The connection portion to this ground wire and the connection portion between the microswitch 3 and the lead wires 18 and 18 are insulated by the resin mold 1.

In the above configuration, if there is a current leakage in the microswitch 3, an electric shock may occur through the operating member 4 and the pull cord 6, but in this case, the metal piece 16 connected to the ground wire 17 comes into elastic contact with the operating member 4. Therefore, even if there is a leakage, there is no chance of getting an electric shock.

As described above, in the present invention, the ground wire 1 is connected to the metal operating member 4.
Since the metal piece 16 connected to 7 is kept in constant contact,
Even if there is a leakage in the switch part, there will be no electric shock, and a safe switch can be provided.

Furthermore, if the microswitch 3 is used as in this embodiment, it is less likely to leak current compared to a normal pull switch with exposed electrical contacts, and in combination with the above-mentioned grounding mechanism, the safety level is greatly improved. This makes it particularly suitable as a switch for bathroom ventilation fans used in humid areas.

In addition, the grounding metal piece 16 is formed integrally with the leaf spring 5 for pressing the microswitch, which reduces the number of parts, reduces the size, and facilitates assembly.
Since the microswitch and the grounding metal piece are close to each other, it is possible to further reduce the size of the switch, and to more reliably ground leakage from the microswitch, improving safety.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the switch according to the present invention with the lid removed, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG. 3 is a front view of the leaf spring. 4... Operating member, 17... Earth wire,
16... Metal piece, 3... Micro switch, 5... Leaf spring, 6... Drawstring.

Claims (2)

[Scope of utility model registration request] (1) In a device that opens and closes the electrical contacts of a microswitch by sliding a metal operating member up and down to press a leaf spring, the electrical contacts of a microswitch are connected via the iron plate spring, and the earth wire is connected integrally with the leaf spring. The switch is formed of a metal piece, and the metal piece is always slidably in contact with the operating member in the vicinity of the microswitch. (2) The switch according to claim 1, wherein the operating member is moved up and down by a drawstring.