JPS5925076Y2 - vibration detection switch - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vibration detection switch having an inverted pendulum.

Conventionally, commonly used inverted pendulum type vibration detection switches cannot be automatically reset once activated, and must be manually reset.

However, in recent years, vibration detection switches have been developed that automatically return to normal operation once they have been activated, and which electrically retain the instantaneous operation signal.These vibration detection switches are easier to operate and have a simpler structure. Therefore, automatic return type vibration detection switches are becoming mainstream, and there is also a demand for automatic return type vibration detection switches of the inverted pendulum type.

In addition, in this type of inverted pendulum type vibration detection switch, the force to open and close the switch depends on the spring force of a separately provided spring and the attraction force of a magnet, and the operating force of the pendulum is simply the above spring force and attraction force. This was only for the purpose of inputting data, making the structure complex and hindering miniaturization.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an automatic return type vibration detection switch that has a simple structure and is easily miniaturized.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings, which are examples of the present invention.

In the drawings, the vibration detection switch according to the present invention is roughly composed of an inverted pendulum 1 and a base 7.

The inverted pendulum 1 is integrated by fitting a weight 4 from above between the claws 3 at the upper end of a synthetic resin holder 2. The holder 2 has an edge 5 formed at its lower end and a flat end. An insertion hole 6 is formed in the center.

The base 7 has a lower cover 9 on the bottom surface of a base body 8 made of synthetic resin.
The lower cover 9 is fitted with a claw part 10 to prevent it from falling off, and a contact part is formed in the space between the main body 8 and the lower cover 9.

The main body 8 has an annular seat 11 on its upper surface on which the edge portion 5 of the holder 2 is placed and an opening hole 12. A stopper step 13 is protruded from the lower edge of the opening hole 12. The three terminals 14, 15, and 16 are press-fitted and fixed.

A movable piece 17 is spot welded to the central terminal 16, and a movable contact 17a of this movable piece 17 is connected to the terminal 14.
．． It is located between the normally closed contact 14 a and the normally open contact 15 a provided at the tip of the contact point 15 .

18 is a synthetic resin operating shaft (see Figures 2 and 5);
A spherical portion 19 is formed on the lower surface of the upper end of the operating shaft 18, and a bifurcated leg piece 20 having a claw portion 21 is integrally provided on the lower end.

This operating shaft 18 is inserted into the insertion hole 6 of the holder 2 and the opening hole 12 of the base body 8 so as to be vertically movable, and the spherical portion 19 is engaged with the upper edge of the insertion hole 6 of the holder 2 so as to be angularly displaceable. It has been stopped.

Further, by inserting the movable piece 17 between the legs 20 of the operating shaft 18 and fitting the claw portion 21 of the leg 20 into the hole 23 of the stopper 22, the movable piece 17 is prevented from falling downward. There is.

A small protrusion 24 is provided on the upper surface of the spring 22 by extrusion processing, and this small protrusion 24 is always in point contact with the lower surface of the movable piece 17.

Next, a method of assembling the vibration detection switch having the above configuration will be explained.

First, while press-fitting and fixing the terminal 14.15° 16 to the base body 8, insert the operating shaft 18 into the holder 2 from above, and insert the lower end leg piece 20 of the operating shaft 18 into the opening hole 12 of the base main body 8. do.

Then, the movable piece 17 is inserted between the leg pieces 20, and the leg pieces 20
A stopper 22 is fitted from below to prevent the movable piece 17 from being removed, and a lower cover 9 is attached to the lower surface of the base body 8.

Thereafter, the weight 4 is fitted between the claws 3 of the holder 2 to complete the assembly.

As mentioned above, assembling the contact part, the inverted pendulum 1 and the base 7
The assembly work is extremely simple, as the connection can be made simply by fitting.

Next, the operation of the vibration detection switch will be explained.

First, in a state where it is not subjected to vibration, the inverted pendulum 1 is placed upright on the base 7, the movable piece 17 pulls down the operating shaft 18 with its own spring force, and the movable contact 17a is connected to the normally closed contact 1.
4 It is in contact with a.

Now, when vibration is applied to this vibration detection switch, the inverted pendulum 1 tilts with respect to the base 7, and the upper edge of the insertion hole 6 of the holder 2 pulls up the spherical part 19 of the operating shaft 18 (as indicated by the dashed line in Fig. 2). show).

As a result, the operating shaft 18 moves upward to bend the movable piece 17 upward, and the movable contact 17a comes into contact with the normally open contact 15a.

This operating signal is sent to an electric circuit (not shown) via terminals 15 and 16 and is self-maintained.

When the vibration stops, the inverted pendulum 1 automatically returns to the upright state, and the movable contact 17a switches to the normally closed contact 14a again.

That is, when the inverted pendulum 1 is tilted at the maximum angle, the operating axis 1
The stopper 22 fitted on the leg piece 20 of 8 hits the sill/flange step 13 protruding from the base body 8, and prevents the inverted pendulum 1 from tilting beyond the range where it can self-return due to its own weight. And when the inverted pendulum 1 is about to return, the movable piece 17
Since the spring force acts on the operating shaft 18 downward, that is, in the direction in which the inverted pendulum 1 returns, the inverted pendulum 1 quickly returns to its upright state.

As is clear from the above explanation, according to the present invention, when the inverted pendulum is tilted, the operating shaft is pulled up, and this operating shaft directly operates the movable piece to open and close the contacts. There is no need to provide springs, magnets, etc., and the structure can be simplified and downsized.

Moreover, by regulating the stroke of the operating axis,
Since the inclination angle of the inverted pendulum is regulated within the automatic return range, an automatic return type vibration detection switch can be easily obtained.

[Brief explanation of the drawing]

Fig. 1 is a front view of the vibration detection switch according to the present invention, Fig. 2 is a sectional view taken along line II-II in Fig. 1, Fig. 3 is a plan view, and Fig. 4 is a bottom view with the lower cover removed. FIG. 5 is an exploded perspective view of the main parts. 1... Inverted pendulum, 4... Weight, 7... Base, 13
...Stopper step, 14.15.16...Terminal, 1
7... Movable piece, 18... Operating shaft, 19... Spherical part, 20... Leg piece, 22... Stopper.

Claims (1)

[Scope of utility model registration request] an inverted pendulum equipped with a weight; an operating shaft that has a spherical part on the lower surface of its upper end, the upper end of which is locked to the lower end of the inverted pendulum, and moves up and down within the automatic return range of the inverted pendulum; a base that supports the lower end of the inverted pendulum in an upright state; a movable piece that is attached to the base and that engages with the lower end of the operating shaft and is displaced upward by the upward movement of the operating shaft as the inverted pendulum tilts; A vibration detection switch consisting of a movable piece and a fixed contact that connects and separates depending on the displacement of the piece.