DE1924875A1 - Electronic security lock - Google Patents

Description

H-521

Tore Gottfrid Hesseigren, Johanneshov (Sweden)

Electronic safety lock

The invention relates to an electronic security lock with a number of circuits connected downstream which, when actuated by an input code pulse train exercise a parallel function and an output signal to the Generate opening of the lock when the pulses in a predetermined Order to be received.

The invention relates to code locks and in particular on electronic locks of this type, which have a very simple structure and secure protection against the use of force Offer.

Various designs of such security locks are already known, but all of them are quite complicated without being able to provide the desired protection. When such locks are designed, they are electromechanical

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Pedometer uses that according to a predetermined key be operated. The work of these movable components can, however, be eavesdropped, so that the lock is unauthorized can be opened. Such locks are therefore quite complicated and do not lend themselves to being automated Production.

For this and similar purposes, relay chains with mechanical relays have also been proposed, but in a certain way Sequence must be operated in order to achieve the desired result. In this case it is also possible to change the code setting quite complicated and a neutralization of the entire arrangement in the event of incorrect handling.

Furthermore, electronic code locks have become known which have a number of code levels, which code levels are actuated one after the other in a predetermined order, the last stage being the control voltage when actuated generated that the locking circuit for opening the lock actuated. Such a lock is described in detail in Swedish patent application No. 2200/1967.

The invention relates to a code lock with different stages, which have a parallel function in contrast to the lock described above.

The invention will now be described in detail in the enclosed Drawings is the

Fig.1 shows the principle of the invention, and the

Figo2a and 2b together show the circuit for the security lock according to the invention.

In the table in FIG _e 1 a represent - d Kodeimpulseingänge and ρ represents the alarm input Vt -. V4 are flip-flop circuits, which are actuated by the incoming Kodeimpulsen, wherein the actuation of the Plip-flop circuits 72 - V4 via the AND gates GY2 - GV4 takes place. All AND gates feed directly

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an AND gate GLa, which takes effect at all inputs requires the supply of signals. There are also the gates Ga- Gd are provided, which are interconnected to form an OR circuit which, when an output from one of the gates Ga-Gd ″ is activated and causes an alarm to be given. The inputs of the gates Ga-Gd are connected to the code inputs as well as with the alarm input and the outputs of certain flip-flop circuits.

The lock is set up so that it has the correct key switch and a code pulse must arrive via the associated conductor so that the gate Ga remains in the idle state. Of the Code pulse also switches the flip-flop V1, with the gate Ga is put out of operation, and at the same time with the preparation of the gate GV2 via the code pulse a the first Condition for opening the lock is met.

Since the flip-flop V1 is in the actuated state and the gate GV2 is prepared, the gate conducts the next one Code pulse b to flip-flop V2, which is then switched. The code pulse b can then be the alarm pulse in the gate Gb at the same time when reaching the GV gate? prevents that is then prepared. The same processes are repeated at the subsequent pulses "c and d. However, if a new pulse occurs before or after the reception of the pulse b, an alarm is triggered via the gate Gc, with the failure of the Code pulse c the alarm pulse is not neutralized.

So that the lock can be opened, all flip-flops V1 _ V4 must be switched in the correct order. The function of the lock is determined by the UKD circuit GLa, which produces an output when all flip-flops have been operated and switched. On the other hand, the AND circuit. GLa only controlled by the flip-flop V4, which only switched when all of the preceding flip-flops in the chain have been operated in the correct order.

The flip-flops V1 _ V4 can be made of bistable designs

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exist, so that there is a time constant in the entire system is introduced in the case of coordinated provision. The time constant can be suitably regulated by the alarm pulse ρ.

Figures 2a and 2b show the detailed circuit for a preferred embodiment of the invention. The two figures should be put together in such a way that the upper edge of Figo2b is placed against the lower edge of Fig.2a. In the For the sake of clarity, the figures are only the conductors and connection points required to understand the invention shown, wherein the connection points bearing the same reference number are intended to be connected to one another. The figures also show a large number of circuit elements such as Resistors, capacitors and diodes supply the electronic relay circuits with the appropriate voltages at the appropriate time respectively. Most of these circuit elements do not form part of the invention. These circuit elements are not using Provided reference numerals and not mentioned in the following description, but only the circuit elements, active and passive, their functions for understanding the invention are important.

The Fig.2a shows a ladder network with a number horizontally running conductor and with the associated key switches 0-9 as well as with several vertical conductors a - d, with each vertical conductor connected to a specific horizontal conductor e.g. at the connection points shown. Because the lock can only be opened by the pulse sequence a, b, c, d can, it means that the code consists of the number sequence 3,0,6,7. This code can easily be changed by that other connection points are chosen. The code pulses are conducted via the vertical conductors to the flip-flops, which in the present case consist of the transistor pairs T1, T2; T3, T4? T5, T6; T7, T8 exist, while those in Fig. 2b illustrated transistor combinations 3? 9, T1O; T11, T12j T 13, TH and T.15, T16 form the gates Ga - Gd. The feeding this gate takes place in part via the connections ¥ 1 - W4 and

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partly via the connections Yf - Y4 »which latter connections correspond to the alarm input ρ in the Mg ₀ 1. Me outputs Q1 -. Q4 from these gates are fed to transistor T17, which is the OR circuit G-La in Pig. 1 and triggers an alarm when pressed. The gate outputs are also fed to the gates T9,10, .. T15 »16 via the terminals X and Z in order to neutralize any alarm pulses supplied, as well as via the terminals R of the blocking circuit, which performs an AND function and through the transistors T1.8-T20 is shown »

In connection with FIG. 2a, the switching of the Flip-flops T1, T2 - T7, T8 described, with attention being drawn to this that the switchover only takes place at the end of the supplied code pulse he follows.

The switching of the flip-flops takes place via a capacitor C-, that in the base circuit of a transistor in each transistor pair is switched on. This capacitor is “charged by the supplied code pulse, and the associated base electrode receives the proper potential "when the capacitor is discharged, which occurs at the end of the code pulse.

A pulse a, for example, that of the first code level with; the flip-flop T1, T2 and via the connection W1 to the gate '19, TIO, creates a short-circuit connection between the base of the transistor T9 and earth and prevents the alarm from being triggered (the alarm pulse arrives at the same time via the connection Y1 The pulse a actuates the first flip-flop T1, T2 in such a way that the transistor T1 becomes conductive when the capacitor 0 is discharged, with the result that a pulse occurs at the connection X1, Z-2, which operating state is then maintained a function of the gate T9, T1Q is prevented, ie _a transistor T10 short-circuits the base electrode of the transistor TIO, which prevents an output signal from occurring at the output Q1 of the gate Connections Q always negative.

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When a code pulse a arrives, the base electrode of the Transistor T1 negative, making T1 conductive and consequently T2 also becomes conductive. After that it will be in a special state of tension produced with the help of the resistors r, which form a voltage divider and correspond to the AND gates GV2 - GV 4 in Fig. "1" These voltage conditions enable proper operation when the next code pulse arrives b.

If the code pulse is applied to your next flip-flop, then whose operational status is affected at the end of the 'pulse, when a discharge across the lower resistor r and the Tranfc sis tor T2 to earth. Then the transistor T3 is conductive, and the same processes are repeated as for described the first code pulse. The same also applies to the following code levels.

An alarm is triggered as soon as a negative pulse occurs at one of the inputs Qi - Q4 of transistor T17. In this case the transistor becomes conductive and triggers an alarm. A negative voltage at the terminals QI - Q4 is obtained when one or more of the transistors TIO, T12, TI 4 or D16 become conductive, and this case only occurs if the lock is improperly handled, i.e. if the impulse codes are in the wrong order .
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l & ient claims

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Claims (1)

Claims Circuit for an electronic security lock with a number of code level circuits connected downstream, each circuit being an electronic relay element contains, which can be actuated by input code pulses is characterized by gate circuits (Ga - Gd), which interact with the code stage circles and directly and parallel to an alarm pulse input (ρ) in the circuit are connected, and their outputs are connected to a common alarm circuit (GLa), so that the circuit at the same time an alarm pulse is supplied with each input code pulse, but the connection between the electronic relay elements (V1 - V4) and the gate circuits (Ga- Gd) is selected in the code step circles so that with the proper continuity of the input code pulse plus * the influence of the supplied alarm pulse is neutralized. Circuit according to Claim 1, characterized in that each gate circuit (Ga - Gd) is directly connected to the relevant code pulse input (a - d) and with the Alarm pulse input (ρ) and a connection to the outputs of the associated and the preceding electronic relay element. 909850/0048 Blank page