CN85200005U - Electrical cryptograph alarm lock - Google Patents

Abstract

The utility model has a given four-bit digital internal code which can be altered by a user at any moment. When a door needs to be opened, the user needs to open a protecting case of a numeric keyboard with a mechanical key first, then, the power of the utility model is switched on, and the correct four-bit digital code is pressed, so the circuit acts, and the locked door can be opened. When the input digital code is inconsistent, alarm sound can be sent out immediately, and the alarm sound can not stop until the owner of the utility model arrives in the site. A secret code alarm unit of the utility model can be arranged on the situations of a gate of a security room, a strongbox, etc.; the utility model has the warning functions in prizing prevention, moving prevention and smashing prevention; an unlocking part of the utility model adopts a non-contact circuit with long service life, and a standby circuit which is switched over by a switch is adopted for preventing the occurrence of fault by accident on the circuit; the utility model adopts a CMOS circuit with low electric energy consumption, the electric energy is not consumed when the utility model is not unlocked, and the power supply of the alarm circuit is off when no alarm is sent out.

Description

Electrical cryptograph alarm lock

The invention belongs to the application of electronic technology.

Before the present invention makes, also have report, for example US4232354 described: though device is simple, insufficiency; The complicated cost height of the described device circuit of US2091337 and function is incomplete yet; The more mechanical contact of the described employing of US4062056 makes the lost of life of lock.

The objective of the invention is to overcome above-mentioned shortcoming, adopt better simply circuit structure, obtain multiple functional, the electronic cipher alarming lock of dependable performance.

The main points of this invention are preferred by to electronic circuit, combination produces and a kind ofly anti-ly removes, pick-proof, anti-ly pound, the reliable electronic cipher alarming lock accurately of the complete security performance of warning function.

Accompanying drawing is circuit theory diagrams of the present invention

The keyboard 10 that is carved with 0～9 numeral among the figure is installed in the outside of door, also has two keyboards 12 and 14 that are carved with other symbols on the keyboard, and key 12 is reset keys, and key 14 is the anti-alarm keys of pounding.By adorning a protective surface box, the personnel that prevent to be mixed with at will press key and report to the police, and the mechanical type drawer-lock is installed on the face box on the numeric keypad, and after the user opened the lid with key, keyboard 10 just can expose out.Key 10 is connected with the circuit that is installed in an inboard.Switch 10 links to each other with internal mechanical formula decimal coded switch 16, and 16 have 10 inputs, an output, and 16 directly respond the numeral of keyboard 10.When code switch pushes 5, press by numerical key 5, just make code switch be output as high level.16 have four identical encoders forms the group of four figures, and the user can make up needed four codings at any time, and four outputs of encoder 16 are connected respectively on the D end of four d type flip flops 11,13,15,17.

Keyboard switch 10 is by switch diode D ₁～D ₁₀With R ₁, D ₁₁, D ₁₂Be connected, at every turn by a numerical key 10, D ₁₂With regard to luminous demonstration once.D ₁₁With impulse generator 18,19,20 are connected, and output is connected to the CL end of frequency-dividing counter 22.19,20 form rest-set flip-flop, and 18 is phase inverters, C ₁And R ₂Be that anti-trembling use integrating circuit, whenever press to hold at 22 CL and just produce a positive pulse by numerical key.Reset key 12 is via R ₅, D ₁₃Be connected on 22 the reset terminal R, pressing button 12, to make 22 output " 1 ", " 2 ", " 3 ", " 4 " all are low levels.After resetting, press again by numerical key, high level appears in first output 22, by the second time numerical key be high level at second output of 22, press by 4 numerical key nodes 26 and produce high level, 26 link to each other with the EN end makes frequency-dividing counter 22 lockings, if press the 5th numerical key again, 22 what one turns to for guidance or supports rest on the 4th press by after state, 26 is high level.Reset key 12 is by R ₅, D ₁₅, R ₁₄Be connected with d type flip flop 11, press button 12, d type flip flop all is reset.Q is a high level, and Q is a low level.The S of d type flip flop passes through R ₁₆Ground connection is when needs unblank to connect K from the door inboard ₃The S end is got final product for high level.

Of the present utility model further describe as follows.The user compiles 4 codings closing to give in front of the door, and for example 6879, door is shut, when needs open the door, connect the power switch K that unblanks earlier ₂, K ₂Be installed in the below of digital disk, press then by reset key d type flip flop and frequency-dividing counter are resetted, press numerical key 6879 again, when pressing first digit 6 by numeric keypad 10,22 one-output terminal output high level, the D input of d type flip flop 11 is high level.Because the signal through 22 is produced by pulse-generating circuit 18,19,20, the D end input signal of the signal lag d type flip flop of frequency-dividing counter output in time makes d type flip flop 11 upsets, Q ₁₁Become low level by high level.Pressed on time when second order digit keyboard 8 quilts, the D end of 22 output " 2 " and d type flip flop 13 is high level, and 13 overturn, Q ₁₃By high step-down, give next d type flip flop acknowledge(ment) signal and overturn condition is provided, when third digit 7 is pressed d type flip flop 15 upsets on time, Q ₁₅Convert low level to by high level, accept fourth digit 9 to 17 condition is provided, when fourth digit press by after 17 the upset, Q ₁₇Uprise Q by low ₁₇High level pass through R ₂₀, K _1-1Be added to the driving stage BG that unblanks ₁And BG ₂On, make BG ₁, BG ₂Saturation conduction, electromagnet 30 adhesives drive the bolt pin, and door is opened.D ₁₇Luminous indication when being normal door, D ₁₈Be to prevent BG ₁, BG ₂Designed by the puncture of the induced voltage of electromagnetism iron wire coil.Press when opening the door by number, as long as there is one to be wrong, will report to the police, and lock can not be opened, and for example 8 mistakes in 6879 are pressed into other any numeral, though this moment d type flip flop 13 the CP end have a positive pulse, but the D input is owing to the output line that machinery gives coding is linked on the numerical key 8, making the signal of D end is zero, and 13 can not overturn Q ₁₃Be high level, because 13 Q is connected to 15 R end, make d type flip flop 15 still be in reset mode, same 15,17, also be in reset mode, lock can not be opened.

This device when being opened by fourth digit sign indicating number lock, automatically resets after about three seconds when normally unblanking.The Q end of d type flip flop 17 is connected to R ₁₈, D ₁₆, R ₁₉, C ₆To ground, C ₆Pass through R ₁₄Link on 11 the R end, the current potential of the Q end when 17 passes through R during by low uprising ₁₃To capacitor C ₆Charging, through about three seconds, C ₆Charging voltage have certain numerical value, d type flip flop 11 is resetted, 11 are reset, 13,15,17 and then reset Q successively ₁₇Become low level by high level, capacitor C ₆On charging charge through D ₁₆, R ₁₉Discharge.Work as Q ₁₇BG when being low level ₁, BG ₂Being in cut-off state electromagnet coil no current flows through.Produce big electric current when unblanking only had three seconds at every turn, this device for prolonging the application life of battery.

NAND gate 28 is warning input circuits, and input of 28 links to each other another input and C with 17 Q end ₅, R ₁₇Link to each other R ₁₇The other end and the CP of node 26 and 17 end join.Node 26 is low level, Q when circuit is in reset mode ₁₇Be high level, 28 are output as high level, do not produce warning.Press by number with giving coding when inconsistent, as long as press by four figure keys, Q ₁₇Still be high level, node 26 also is a high level, and 28 are output as low level, produces alarm sound.Therefore d type flip flop 17 just upset after the CP pulse arrives for preventing false alarm when 17 overturn, adopts R when normally unblanking ₁₇, C ₅The integrating circuit of forming makes the CP pulse that is added on 28 lag behind 17 upset, guarantees not produce the wrong report phenomenon in the moment of unblanking.R ₁₅C ₄It also is an integrating circuit, it guarantees in 3 seconds of normally unblanking frequency-dividing counter to be resetted, make the high level of node 26 be turned into low level earlier, d type flip flop is automatically reset, thereby guarantee that 28 input two situations that input is high level simultaneously occur at the Shi Buhui that normally unblanks.In case 28 output low levels are passed through K switch _1-2, R ₂₁, R ₂₂Make BG ₃Be transformed into the saturation conduction state by ending.Relay coil 36 flows through electric current, and switch 38,40 adhesives are added on the warning circuit warning power supply, if 38 1 adhesives, no matter BG ₃Whether conducting, power supply E ₂Just be added on the coil 36, guarantee E by switch 38 ₂All the time connect D with warning circuit ₁₉Be that string is 36 and BG ₃Between, after switch 38 is connected, cut off E ₁, E ₂Between contact.D ₂₀Be protection D ₁₉And BG ₃And be provided with prevent to respond to high-voltage breakdown D ₁₉And BG ₃, switch 32 can be that anti-moving closed or the pick-proof switch, no matter it is to pound key with anti-to pound key 14 in parallel, still moves cabinet, perhaps force open the door, and as long as switch is in case connection, power supply E ₂Be switched on warning circuit too, BG when principle and incorrect unblanking ₃The situation of conducting is the same.

Warning circuit of the present invention is composed as follows, and 41,43 form multivibrator produces the extremely low square-wave signal of frequency, and the 45, the 47th, the intermediate buffering level is passed through R ₂₆Be added on the transistor time base circuit 50,50 itself form oscillator, and frequency of oscillation is subjected to 41 and 43 controls, produces the alarm sound of ambulance.R ₂₅C ₇Form electric source filter circuit.

Be provided with the independently identical unlock circuit of two covers in apparatus of the present invention, by K switch _1-1Conversion prevents that unlock circuit from breaking down suddenly, still can normally unblank.

Claims (8)

1, a kind of electronic cipher alarming lock with protection keyboard is characterized in that the pulse shaper is made up of the rest-set flip-flop that single knife switch connects and anti-ly removes, pick-proof, prevents that pounding warning circuit forms.

2, by the said electronic cipher alarming lock of claim 1, it is characterized in that pulse shaping circuit by rest-set flip-flop (19), (20) and phase inverter (18) are formed, and this pulse shaping circuit is connected with the mathematics keyboard (10) that single knife switch is formed.

3, by the said electronic cipher alarming lock of claim 1, it is characterized in that warning circuit by anti-ly pound switch (14), anti-ly remove, pick-proof switch (32), relay (36), (38), (40), the voicefrequency circuit that sends the ambulance alarm sound form.

4, by the said electronic cipher alarming lock of claim 1, it is characterized in that having the error code of pressing warning device, this partial circuit is by NAND gate (28), transistor BG ₃, integrating circuit forms.

5, inform against somebody the alert lock of sign indicating number by claim 1,4 described electronics, it is characterized in that integrating circuit is by R ₁₇, C ₅, R ₁₅, C ₄Form.

6, by the said electronic alarm lock of claim 1, it is characterized in that having a starting drive of unblanking, this device is by the driving stage BG that unblanks ₁, BG ₂, electromagnet 30 forms.

7, by the said electronic cipher alarming lock of claim 1, it is characterized in that having long warning device.

8, by claim 1,3 said electronic cipher alarming locks, it is very levied is that the voicefrequency circuit that sends the ambulance alarm sound is multivibrator (41), (43) and the intermediate buffering level (45) that is made of the CNOS device, the device that (47) are connected with time base circuit (50).

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