Communications: electrical – Continuously variable indicating – With meter reading
Patent
1982-04-21
1985-02-12
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
34082564, 361172, H04Q 900, E05B 4900
Patent
active
044994621
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an electrical circuit arrangement for electronically-coded locks.
2. Prior Art
A code controlled, one-knob, electro-door-opening installation is known (German AS No. 27 21 139 and AS No. 29 52 212). In such case the code signals are fed in with a bell button, whereby either the keyed-in pulses are counted simultaneously, or after pressing the bell button, a pulse generator is put in motion which, depending on the duration of the operation of the knob, releases a certain number of impulses. After releasing, waiting and renewed pressing down of the bell button, the next number is fed into the next storage. When all code numbers are selected correctly, then finally the last storage releases the voltage supply of the electric door opener contact for a limited period of time.
In the case of such installations, a simultaneous counting of the key operation or a return report is required, in which case the release impulses may be counted by a flashing light. The decoding, that is to say the feeding in of the code to be recognized, therefore requires concentrated attention in every case, whereby the return report will still have to be hidden from unauthorized persons in order not to reveal the code.
For suitcases and briefcases, mechanically codable lockings in the form of so-called number locks are known. As a rule, they have 4 to 6 ten-digit number plates, which have to be set in a predetermined or arbitrary sequence to a certain number. The direction of rotation may also be prescribed. In the case of such number locks, they have the disadvantage that the setting of the correct number is relatively cumbersome and requires sight contact.
Number locks with electronic codings are also known, where a key is assigned to each digit of, for example, a six-digit number. For the purpose of unlocking the lock, the keys must be operated in a predetermined sequence, i.e., by repeatedly pressing down each key, the code number assigned to each digit is selected. In the case of these locks, also the feeding in of the code to be recognized requires complete attention and sight contact is required.
The programming or setting of the code in the case of the known electronically coded locks is in most cases quite complicated and, therefore, will have been done already at the factory.
BROAD DESCRIPTION OF THE INVENTION
The invention is based on the objects of overcoming the previously mentioned disadvantages of the prior art and of creating a circuit arrangement with which the unlocking can be triggered without concentrated simultaneous counting, looking at it and the need of a return report of the fed-in signals. The code should be easy to impress on one's memory and easy to learn. Yet it should be personal and have a high number of coding possibilities in order to prevent any unauthorized opening by arbitrary or systematic testing of all combinations.
In order to be able to also use such a circuit arrangement for the locking of handbags and suitcases, the power consumption moreover should be so low that the electronic needs for at least one year can be supplied with one dry battery.
The objects are solved in a surprisingly simple, technically progressive manner with the circuit arrangement of the invention, wherein a signal is produced only at the beginning or the end of every keying and the sequence of the temporal intervals between the signals, that is, the signal pulses, is used as a code, whereby one differentiates at least two pulse lengths (long, short).
According to the invention, the sequence of code signals is fed in serially with a single key. A sight contact or some other type of reporting back is not required because the number and the length of signal pulses which are produced by the operation of the key form the sequence of signals and are evaluated as a code in the manner described. The invention is based on the surprising realization that such a code, in the case of which the signal pulses or the temporal signal intervals identified a
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patent: 4392133 (1983-07-01), Lundgren
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Stoesser Klaus
Vinson Heinz
Battelle - Institut e.V.
Yusko Donald J.
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