JPS593478Y2 - thermal switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermal switch (thermal timer) used as an input regulator incorporated into electrical equipment.

Conventionally, thermal switches used as this type of input regulator are of a type that cannot be continuously energized, or even if they can be energized continuously, an additional electrical circuit must be attached for continuous energization. The number of parts increases, resulting in a complicated structure, which makes assembly and adjustment troublesome, making it difficult to achieve labor savings through mass production, and having the disadvantages of high costs.

In order to eliminate the above-mentioned drawbacks, the present invention connects the fixed contact piece and the tongue piece of the rapid reversal spring using a cam when energizing continuously, and connects the bimetallic contact piece of the movable contact piece and the tongue piece of the quick reversal spring when energizing input adjustment. The input current is controlled by the heater temperature by connecting it to the retaining piece, and as a result, continuous energization and control of the input current can be performed without adding a new electric circuit for continuous energization. The present invention provides a thermal switch whose purpose is to enable selective operation.

Hereinafter, the present invention will be described with reference to an illustrated embodiment.

In FIGS. 1 to 4, reference numeral 1 indicates a pair of rising pieces 1.
A frame (frame body) having a, this frame 1
A knob shaft 2 for inserting a dial, for example, is rotatably mounted on the rising piece 1a, and a cam 3 for time adjustment is mounted on the knob shaft 2.

Further, on the frame 1 located on the opposite side of the cam 3, a column 4 made of insulating material is installed with a mounting screw 5, and on this column 4, a quick reversal spring 6, a fixed contact piece 7, and a movable contact piece are mounted. The pieces 8 and the upper plate 9 are stacked in order from the bottom with each insulating member 10 in between, and are fastened together with nuts 12 through the seat plate 11.

On the other hand, a tongue piece 13 having a hemispherical contact 13a is provided on the rapid reversal spring 6 so as to contact the flat contact 7a of the fixed contact piece 7, and the end of this tongue piece 13 has a hemispherical contact 13a. Conductive spring 14 fixed to free end 6a of spring 6
is curved upward and engaged.

Furthermore, an engaging piece 6b is formed by bending the free end 6a of the quick reversal spring 6, and a hemispherical contact 6C is provided on the upper surface of this retaining piece 6b.

Further, a locking portion 15a is provided at the free end portion 8a of the movable contact piece 8.
A bimetal 15 is provided with an insulator 16 in between, and a heater 17 is wound around the outside of the bimetal 15 with an insulator 18 in between.

Note that one end 17a of this heater 17 is connected to the movable contact piece 8.
In addition, the other end 17b of the heater 17 is connected to the bimetal 15.
It is connected to the.

Further, an insulating material 19 is provided on the locking portion 15a of the bimetal 15.
is provided so as to come into contact with the engaging piece 6b during continuous energization or input adjustment energization, and the bimetal 1
A flat contact 15b is provided on the back surface of 5 so as to be able to contact the hemispherical contact 6C.

Further, a fine adjustment screw 20 made of an insulating material is screwed onto the upper plate 9 so as to finely adjust the position of the movable contact piece 8 upward or downward.

On the other hand, a power source 21 is connected by a lead wire 22 between the other end 6d of the quick reversal spring 6 and the other end 8b of the movable contact piece 8. A load 23 is connected between the lead wire 2 and the other end 7b of the fixed contact piece 7.
Connected by 4.

The operation of the present invention will be explained below.

(1) Continuous energization (see FIG. 1) When continuously energizing according to the present invention, as shown in FIG. 1, the time adjustment cam 3 is rotated by the knob shaft 2.

That is, when the knob shaft 2 is rotated, the cam 3 lifts the tongue 13, and the hemispherical contact 13a of the tongue 13 contacts the contact 7a of the fixed contact 7, so that the current flows to the first
A continuous current-carrying circuit is formed by passing through the load 23 in the direction indicated by the dotted line in the figure.

At this time, the hemispherical contact 6C of the rapid reversal spring 6
Since the hemispherical contact 6C is in contact with the insulator 19 of a and is separated from the flat contact 15b of the bimetal 15, no current flows.

At this time, the joint between the tongue piece 13 and the conductive spring 14 (
When the quick part) O is above the virtual straight line connecting points a and b of the quick reversal spring 6, the hemispherical contact 6C is always separated from the flat contact 15b of the bimetal 15.

This is because the cam 3 is connected to the tongue piece 1 as shown in FIG.
3, the hemispherical contact 6C is separated from the flat contact 15b of the bimetal 15 when the quick portion O is above the virtual straight line connecting points a and b of the rapid reversal spring 6.

(2) Input adjustment When energizing When using the thermal switch of the present invention as a regulator circuit,
As shown in FIGS. 2 and 3, by rotating the knob shaft 2, the time adjustment cam 3 is separated from the tongue piece 13, and the quick part O is moved to the point a of the rapid reversal spring 6. This is done by positioning the point lower than the virtual straight line connecting point b and point b.

That is, when the quick part O is reversed below the virtual straight line, the hemispherical contact 6C of the quick reversal spring 6 comes into contact with the flat contact 15b of the bimetal 15, and at the same time the heater 17 starts to be energized, the tongue piece The thirteen hemispherical contacts 13a are separated from the flat contacts 7a of the fixed contact piece 7, and the load 23 is not energized.

Then, the heater 17 is energized, and the bimetal 1
5 is heated and gradually curves, and when the quick part O comes above the virtual straight line connecting points a and b of the quick reversal spring 6, the quick reversal spring 6 is reversed and the hemisphere The contact 6C is separated from the flat contact 15b of the bimetal 15, and current no longer flows through the heater 17.

At the same time, the hemispherical contact 13a of the tongue piece 13 comes into contact with the flat contact 7a of the fixed contact piece 7, causing current to flow through the load 23 (see FIG. 3).

At this point, since no current flows through the heater 17, the bimetal 15 cools down naturally and begins to return to its original position as shown in FIG.

During this return stroke, when the quick part O comes below the imaginary straight line connecting points a and b of the quick reversal spring 6, the quick reversal spring 6 rapidly reverses and the second Return to the state shown in the figure.

In this way, the above-described operations are repeated and input adjustments are made.

The cam 3 is configured such that the on/off ratio of input adjustment and the energization time can be freely adjusted.

As described above, according to the present invention, during continuous energization, the cam 3 actively connects the fixed contact piece 7 and the tongue piece 13 to
3, and on the other hand, when power is applied for input adjustment, the load 23 is intermittently controlled and energized by the cooperation of the bimetal 15 by the heater and the rapid reversal spring 6, so the configuration is simple. Not only is it easy to use, but it is also easy to handle and operate, and mass production can save labor.

[Brief explanation of the drawing]

FIG. 1 is a diagram of a thermal switch according to the present invention, FIGS. 2 and 3 are diagrams for explaining the operation of the present invention, and FIG. 4 is an exploded perspective view of the present invention. 1...Frame, 2...Knob shaft, 3
...Cam, 6...Rapid reversal spring, 7.
...Fixed contact piece, 8...Movable contact piece, 9...
...Top plate, 10...Insulating member, 13...
... Tongue piece, 14 ... Conductive spring, 15 ...
...Bimetal, 16...Insulator, 17...
... Heater, 19 ... Insulating material.

Claims (1)

[Scope of utility model registration request] A knob shaft mounted on the frame, a cam fitted on the knob shaft, a column installed in the frame located on the opposite side of the cam, and a column connected to the column from below through each insulating member. A quick reversal spring having tongues provided in this order, a fixed contact piece and a movable contact piece, a conductive spring fixed to an end of the quick reversal spring and curvedly engaged with the tongue piece, and the movable contact piece. A bimetal having a locking part provided at the end of the piece through an insulating material, a heater wrapped around this bimetal through an insulator, and the above-mentioned quick-starting element so as to come into contact with the insulating material of the locking part. It consists of an engaging piece formed at the end of the reversing spring, and when energized continuously, the cam connects the fixed contact piece and the tongue piece, and when energized for input adjustment, the bimetal and the engaging piece are connected. A thermal switch characterized in that the input current is controlled by the heater temperature.