DE3509361A1 - Movement sensor - Google Patents

Abstract

The advantage according to the invention is that the behaviour of the hinged armature of a cheap relay (DM 1.30) is changed as a result of the above-mentioned simple extension of the lever arm and the above-mentioned increase in the mass moment of inertia as the result of an additional weight at the end of the lever arm, such that this relay acts as a movement sensor. The relay can be used equally well, without intermediate elements, as a power switch for setting signal transmitters in operation, and, if the relay coil and normally-open contact are connected in series, the self-latching which is generally desired is also thus produced at the same time once the contacts have touched.

Description

Annex to the patent application dated March 14, 1985 with the designation

Motion detector.

The invention relates to a motion detector for anti-theft protection rebuilt relay.

It is known to have a direct or indirect contact-making motion detector, a circuit breaking key switch and a signal transmitter with a To connect the power source in series.

It is also known the normally open contact of a relay and the relay to connect coil in series} in order to achieve a self-holding of the relay.

But it is also the underlying object of the invention to convert a relay so that it is suitable as a motion detector to work together with Key switch, signal transmitter and power source built into one housing, two-wheelers to protect against theft.

In order to increase the sensitivity of the relay for shock and movement increase, the following measures according to the invention are taken, see drawing picture 1.

The hinged armature K of a relay rotates around a pivot point A represents a lever arm which is extended by a stiff wire D soldered onto it will.

Since it is only about the extension of the lever arm, this one can have a different shape, be mounted differently, or form a unit with the hinged armature form.

As is well known, the relay makes contact, in Figure 1 at Ko, when the hinged armature moves in relation to the relay. In the present case, the whole relay is moved by external shock or movement, and the armature should move due to the mass> inertia at least temporarily less, so the relay contacts touch each other.

In order to achieve this purpose, the ones made up of K and D are expedient Provide the lever arm with a weight G at the free end if possible, e.g. with a soldered on 5 mm nut.

In addition, the sensitivity to shock and movement increase, the relay spring F is exchanged for a weaker one or a weak one provided so that with the aforementioned lever arm ratios without moving the entire device No contact has just been made with Ko in Figure 1. As far as the invention Measures.

In Figure 2 are battery B, relay coil Sp, normally open contact Ko of the relay, Key switch S, which closes when the key is pulled out, and signal transmitter "Signal" connected in series. If the key is removed, the circuit is only interrupted by the normally open contact Ko of the relay. Will go through Movement of the relay the relay contact is briefly actuated, the circuit is briefly closed, the series-connected relay coil Sp has a current flowing through it, closes the Normally open contact Ko of the relay continuously until the circuit is opened by inserting the key is interrupted in the key switch. The system is only then ready for operation again by pulling out the key.

It is advisable to use a modern 1-9V requiring, loud, cheap Signal generator, which in a known manner a resonance capacitor of suitable size in parallel may be switched to increase the volume. As a consumer signal transmitter and relay = coil are in series, the voltage source should be the sum of both and the resistance ratio corresponds to that of the required voltage.

Claims (2)

Claims 1. Relay with self-holding contact connected in series as a motion detector of an anti-theft device, characterized in that the function and necessary sensitivity is achieved by extending the Folding anchor lever arm, a weight at the free end of the lever arm and a spring with defined, low spring force. 2. The aforementioned relay, characterized in that the extension of the lever arm is done by means of wire that is soldered to the hinged armature, which is slightly resilient Stability.