DE2020373A1 - Electronic alarm lock for movable and immovable security objects - Google Patents

Description

Electronic alarm lock for movable and immovable security objects The invention relates to an electronic alarm lock for securing movable ones and immovable objects against unauthorized entry or against unauthorized use; it is particularly suitable for securing safes or motor vehicles.

With such security objects, it is desirable that, apart from from the actual locking function, attempts by unauthorized third parties to access the To provide access to the security object, immediately indicated optically or acoustically will.

At the same time, it should be extremely easy to use with the least amount of energy and optimal operational safety, false alarms can be largely ruled out.

There are already a number of safety precautions to solve this problem, the space surrounding the security object through closed-circuit power systems, electrical fields, Switch off or check high-frequency fields or, as a result, capacitive bridge circuits. It is also known, the mechanical locking devices of the security object self to be interfaced with electrical or electronic devices 7 whereby either when actuated by unauthorized third parties an opening of the locking device Made completely impossible or when a key is inserted as a result of a malfunction High frequency field alarm is given.

These prior art safeguards are either mechanically or electrically or electronically quite complex and / or largely in the interest of permanent functional reliability from a strong external energy source They are also dependent on, in terms of error-free functioning, even for the initiated not exactly easy to use.

The present invention is based on the object, the desired Safety function with a minimum of material and energy without additional Operating requirements permanently and with the elimination of errors that lead to errors To ensure external influences.

An essential part of the new alarm lock that does this job Triggers in a surprising way is a key that comes out of one with preferably two contact rings provided round insulating material with an externally seemingly conventional lock works together.

Inside the key there is a with the contact rings in Connected pre-heated capacitor.

This key completes with the capacitor when inserted into the isolated sole buohae after making contact via ring contacts in the sole socket one in the Sioh.rungsob A very selective resonance circuit located at the same time, which, fed by a small tone generator, the closing device in case of resonance releases the device electromagnetically or via servomotors or servo drives works without quiescent current; this means that only by inserting the key in the lock the system is energized and inevitably, when using a wrong key or other object that activates the alarm device.

Because of the low working current, the system according to the invention operated independently of external power sources.

their duration of operation is due to the lack of quiescent current with internal Power supply unequally larger than that of others more dependent on a power supply Security systems.

The advantages resulting from this consist in the low cost of material, essentially two transistors and some cheap switching elements, furthermore in the minimal energy requirement, which is only at the moment of the. service occurs. Further advantages are maximum operational safety and, because of the special The peculiarity of the purely electronic key, the greatest possible security from unauthorized intruders.

Several entrances can be made from the central lock via servomotors or analogue monitoring or control of servo drives.

When using integrated circuits, the electronic Reliably reduce part of the system to the size of a matchbox.

As an embodiment of the present invention, the new electronic Alarm lock shown on the basis of securing a motor vehicle, with the details Explanation the enclosed figure is used.

As long as the system is de-energized, the door of the fuse object is via the pawl (not shown) of the unlocking magnet, which is in the idle state EM mechanically blocked. With an appropriate mechanical design of the locking mechanisms and when attaching additional servomotors or

Servo drives on other doors can turn them against the Open from the inside - lock if the window is broken.

The system is either the moment the key is inserted S or by inserting another object over the in the lock socket located microswitch SM live.

If the switch SM is over a wrong key or over a other object switched on, the transistor T 2 and thus its remain Relay RLS de-energized, and the alarm signal via AS is immediately via RLS - rest actuated.

If, however, the correct key S with the pre-balanced capacitor CR is used, the system first switches on again via SM; the generator TG generates a certain frequency via the frequency-determining elements CF and LF, this is coupled to the control circuit KM via CK and a control potentiometer.

The capacitor CR in the key S brings together with the Inductance LR in the control circuit KK this in resonance with the generator frequency; only in this The status is then the switching stage ST 2, consisting of transistor T2 and relay RLS, activated. The capacitors CE 1 and CE 2 in the control circuit are used for the galvanic Decoupling of the lock socket; they have a value of preferably about 0.25 MF.

After activation of T 2 via the resonance frequency, it switches in the circuit ST 2 the relay RLS; its changeover contact switches the alarm device AS over RLS - rest from as well as about RLS work the unlocking magnet (s) EM to the positive pole of the power source; the door can be opened.

For security reasons, this must be ensured in the present example be that the doors are unlocked when the passenger car is moving; this will achieved by a switch ZS coupled to the ignition lock, which is activated when the The ignition key keeps the unlocking magnet energized. At the moment when the ignition key is removed, the doors are automatically secured.

On the other hand, this means that the driver can no longer get stuck Unintentionally lock the ignition key from the vehicle.

The control circle is so selective that there is a small percentage deviation of the capacitor CR located in the key immediately to initiate the alarm signal AS leads, so "trying" is out of the question, as the system itself can be tried out first of all, what must be energized via the key switch SM AS actuated immediately.

If the lock is improperly used, the alarm system is activated immediately triggered.

The fact that the electronic alarm lock according to the invention none Quiescent current required, and thus with a built-in relatively weak power source remains functionally reliable for a long time, brings further advantage and progress with it that the alarm lock according to the invention independent of even sources external accidental or deliberate disruption of the energy supply.

Another advantage is that this new electronic Alarm lock due to its peculiarity and the simple design of both the key as well as the key socket an extreme operational reliability even with unfavorable Weather influences (icing).

Another advantage is that the inventive electronic Alarm lock in contrast to other mechanical, electrical or electronic Sioherungseinrichtungen the state of the art practically no operating effort requires.

Yet another advantage is that in what is disclosed electronic alarm lock by changing the generator frequency or by changing it the frequency-determining parts of the resonance control circuit a variety of combinations are possible and thus the greatest possible security against randomly identical keys has proven itself in the hands of unauthorized third parties.

Another advantage is that by dividing the resonance capacity (cR) the access to the security object in series or parallel capacities Bowl S can only be possible in a predetermined location, such as a safe, whose space or floor capacity is included in the resonance capacity.

Another advantage of the alarm lock according to the invention results in the configuration of one of the two frequenzbestim menden members of the tone generator (CF) or (LF) as the second key (S). Access to the security object can then only of two with the corresponding keys (CR) and (CF) or

(LF) equipped persons can be brought about together.

Yet another advantage results from that of the invention Alarm lock, if on the one hand it is a question of having a large number of locks the appropriate key (S) is to be opened, on the other hand each key (S) should only fit a certain lock, such as the one built into locks Bank safes is the case; a central generator (TG) is used for this, which possibly also switched on via a time switch only at a certain time will. This generator (TG) generates a uniform control frequency for all locks; are the inductances (LR) in the individual control circuits (KK) of the locks different and lead solely to fit the appropriate capacity (CR) in each Key (S) to the resonance frequency, which then triggers the switching process via 5T2.

'Patent application

Claims (3)

P a t e n t a n s p r ü c h e 1. Electronic alarm lock for movable and immovable security objects, characterized in that the access to the security object can be brought about by a pre-calibrated capacitor that can be used as a key, which completes a selective resonant circuit and with an applied resonant voltage brings into resonance, the switching process required to open the lock triggered and the tumblers can be unlocked mechanically or electromechanically. 2.) Electronic alarm lock according to claim 1, characterized in that that any number of servo locks can be operated electromechanically via a main lock permit. 3.) Electronic alarm lock according to claims 1 or 2, characterized in that that by dividing the resonance capacity (CR) into a series or parallel capacity, consisting of (CR) in the key (S) and the space or floor capacity of the security object, access to this with the key (S) can only be effected at the predetermined location is 4.) Electronic alarm lock according to claims 1 to 3, characterized in that that when one of the two frequency-determining elements (CP) or (LF) of the tone generator (TG), as a second key the access to the security object only at the same time by two persons provided with the appropriate key (S) can be achieved 5.) Electronic alarm lock according to claims 1 to 4, characterized in that a central generator has a large number of locks Providing separate security objects with a uniform control frequency, whereby the use of different inductances (LR) in the individual locks here also the use of different keys (S) with the appropriate capacities (CR) required. L e r s e i t e