CN2147304Y - Code lock for button type telephone - Google Patents

Abstract

The utility model relates to a code lock for a button type telephone, comprising an encoding circuit and an encoding switching circuit. The utility model can prevent the telephone from being abused by the user who uses the telephone, and the expenses of using the telephone for the telephone owner can be reduced. The code lock has convenient operation, the code number is pressed primarily, and the telephone number then is pressed. The cipher whose digit is one to four can be changed.

Description

Code lock for button type telephone

The utility model relates to a kind of code device, particularly a kind of coded lock for push-button type telephone.

In the daily life, some telephones with lock all adopt the mechanical lock mode to realize the management that telephone is used, and are very inconvenient when this mode is used.Disclose " a kind of electronic password lock " at utility model patent communique (No. 40 first volumes of 1988 the 4th volumes), notification number is GG87216604, and it utilizes the flip-flop circuit composition to have the gate circuit of interlock function to come little pellet shot from a slingshot in the control lock.But this technology belongs to door lock, can not be used for telephone.

The purpose of this utility model provides a kind of coded lock for push-button type telephone for solving the deficiencies in the prior art exactly.

The purpose of this utility model is achieved in that by coding switch circuit and coding circuit forms this coded lock, and coding circuit is made up of on-off circuit, delay circuit, flip-flop circuit, outside line circuits for triggering, gate trigger circuit and figure place sequential circuit.1, the 2 pin input of four inputs, the eight gate trigger circuit IC of two NAND gate compositions connects the W1 and the W3 of coding switch circuit respectively, and the input of 5,6 pin connects the W4 and the W2 of coding switch circuit respectively; Ic chip be flip-flop circuit also be gate trigger circuit.Constitute the figure place sequential circuit by capacitor C 1, C2, C3 and resistance R 1, R2, R3, R4, the termination IC1 pin of R1, C1, the end of an other end and R3, C3 connects the U1 end of coding switch circuit jointly, another termination IC2 pin of R3, C3, the end of R2, C2, R4 connects the IC6 pin jointly, and an other end connects U1 and ground connection jointly; The IC bistable triggers output 8 pin by R13, the R14 machine bridge diode positive pole of answering the call, and the NAND gate that the IC bistable triggers output 13 pin and IC is exported the triode V4 colelctor electrode that 3 pin, 4 pin connect the outside line circuits for triggering jointly; IC exports R5 one end that 9 pin, 11 pin connect delay circuit.Form the outside line circuits for triggering by triode V4, R7, capacitor C 5, diode D3, the V4 emitter-base bandgap grading connects the IC14 pin and connects coding switch circuit U2 end by R12, the V4 base stage meets audio-frequency transformer tertiary winding M by R7, diode D3, capacitor C 5 one termination V4 emitter-base bandgap gradings, the other end be connected on that R7 connects with D3 between.Form delay circuit by R5, R6, R10, C4, R5 and the base stage that meets triode V1 after R6 connects, capacitor C 4 with one terminate between R5 and the R6 other end ground connection after R10 is in parallel.Form on-off circuit by triode V1, clad pipe V2V3 and R8R9, the emitter-base bandgap grading of V1 is powered with telephone signaling integrated package by resistance R 8 and is held D to be connected, and connecing the base stage of clad pipe V2 by resistance R 9, the V2V3 colelctor electrode connects the D end, the operating voltage K end of V3 emitter-base bandgap grading sending and receiving sign indicating number integrated package.Coding switch circuit is made up of telephone key switch and code switch device, and code switch is made up of sliding button, base plate, the lead-in wire dividing plate of pad between coulisse and base plate two ends that the chute in coulisse slides.

Power at the operating voltage line of telephone signaling integrated package and telephone signaling integrated package and to hold bridge switch HK2 between the lead-in wire, when HK2 was closed, the telephone that has this coded lock became ordinary telephone set.

Sliding button is made of, conductive rubber block and two fixture blocks button, and two fixture blocks are clamped conductive rubber block and are solidly connected with button is steady.

Coulisse and base plate are all wiring plate.

The utility model compared with prior art has following advantage: 1. the telephone that is added with coded lock is easy to use, earlier presses the password number, and then presses telephone number and get final product; 2. product is cheap.

Fig. 1 is coding switch circuit and coding circuit electrical schematic diagram.

Fig. 2 is the utility model operating principle block diagram.

Fig. 3 is the code switch structure drawing of device.

Fig. 4 is a code switch device B-B sectional view.

Fig. 5 is back board wiring figure.

Fig. 6 is the sliding button structure chart.

Fig. 7 is the coulisse schematic diagram.

The utility model is further described by embodiment below in conjunction with accompanying drawing: as described in Figure 2, the operating principle of this lock is with a password switching circuit, the duty of signaling circuit in the control telephone.Before not pressing password, on-off circuit ends, and the signaling circuit quits work, and telephone can not sent out the number pulse.After pressing to cryptographic key, the on-off circuit conducting, telephone signaling circuit working, phone can send the number pulse, connects phone through program control microcomputer decoding.As shown in Figure 1, I partly is the part of original call machine circuit, and II partly is a coding switch circuit.Because the reset response of resistance R 1, R2, R3, R4, IC door input pin 1,2,5,6 is a low level, and 3,4 of output pins are high level, and the input pin 8,13 of bistable circuit all is a high level, and 11 of output pins are low level.Triode V1 base potential is 0, and conducting, and making the V2V3 base potential is 0, and clad pipe is in cut-off state, has cut off the working power of signaling circuit in the telephone, makes the phone can not signaling.After the time in accordance with regulations pressed cryptographic key, IC1,2,5,6 pin all were high potentials, and two gate circuits are then abnormal, and 3,4 pin are output as low level, and 13 pin also are all low level, bistable circuit upset, 11 pin output high level.Because the discharge reduction effect of resistance R 1, R2, R3, R4, after several seconds, 1,2,5,6 pin are again low level, and gate circuit restores.After the bistable circuit upset, promptly 11 pin are output as high level, and this electric current charges to C4 through R5, after several seconds, C4 is saturated, and the V1 base stage is a high level, and pipe ends, the clad pipe base potential is raise, clad pipe becomes conducting state by cut-off state, has connected the working power of signaling circuit, and the LED diode is bright, at this moment press telephone number, phone just can send the number pulse.When outside line was called, the tertiary winding of phone sound intermediate frequency transformer produced electric current, stored through D3 rectification C5, made the V4 conducting, triggered the bistable circuit upset, on-off circuit conducting, phone work.Because the capacity of capacitor C 1, C2, C3 is different, wanting to make in official hour IC1,2,5,6 pin all is high potential, just need be since long power supply discharge time, and just can make 4 input pins at last all is high potential.Because the discharge process of resistance R 1, R2, R3, after overtime, each input pin resets separately.So must in official hour, press the big or small sequential power supply of electric capacity, just can make the gate trigger circuit upset.This has just formed the figure place sequential circuit.In delay circuit, the time-delay of unblanking is to be finished by C4 and R5, and it is a charging process.The effect of unblanking to delay time mainly is that the time-delay that prevents signaling circuit in password key signal and the telephone overlaps mutually.The figure place of password can be variable between 1～4, and the figure place of password is many more, and privacy degrees is high more.The password figure place is 1, and several 10 groups of password can be set; Correspondence is 2 in a password, several 90 groups of password; 3 in password, several 720 groups of password; 4 in password, several 5040 groups of password.The setting of password or replacing are finished by the code switch device.As shown in Figure 3, Figure 4, move each sliding button ［ 1 ］ and can arrange different password combination.Coulisse ［ 2 ］ left side target 1,2,3,4,5,6,7,8,9,0 and pairing walking crosswise are represented the numeral of 10 number button.Indicate Z below first row, have 4 sliding buttons ［ 1 ］, represent 4 password numbers that adopted.Secondary series the 3rd row 6 sliding buttons of every row ［ 1 ］ indicate letter C, represent the password figure of 6 bit-errors.Fourth, fifth, six, seven row sliding buttons of every row ［ 1 ］ indicate W1, W2, and W3, W4, that represents password figure puts in order promptly 1,2,3,4.Be lined with lead-in wire dividing plate ［ 3 ］ between coulisse ［ 2 ］ and base plate ［ 4 ］ two ends, coulisse ［ 2 ］, base plate ［ 4 ］ all have wiring layer with the inner surface that sliding button ［ 1 ］ contacts, as Fig. 5, shown in Figure 7.As shown in Figure 6, sliding button ［ 1 ］ is made of ［ 5 ］, conductive rubber block ［ 6 ］ and two fixture blocks ［ 7 ］ button, and two fixture blocks ［ 7 ］ are clamped conductive rubber block ［ 6 ］ and with button ［ 5 ］ are welded to connect.The setting of four figures password is 1735:(one as the password number for example) four buttons of Z row are pushed on numeral 1,3,5, the 7 pairing row; (2) two row C buttons are pushed respectively on 2,4,6,8,9, the 0 pairing row; (3) the W1 button is pushed 1 row, the W2 button pushes 7 row, and the W3 button pushes 3 row, and the W4 button pushes 5 row, and end is set.

The transformation of the way of audio-frequency transformer: the outside line triggering signal is produced by the tertiary winding of audio-frequency transformer, so need in former transformer, increase by a winding, method is as follows: take transformer core apart, enamel-covered wire with φ 0.10 is close around 250 circles in the skeleton outside, draw joint then, seal packet header, load onto iron core, find out the installation of coordination end and get final product.

The circuit elements device parameters can be selected as follows:

R1～R4，0.25W，910K；R5～R8，0.25W，33K；R9，0.25W，16K；R10，0.25W，100K；R11，0.25W，3.9K；R12R13，0.25W，10K；R14，0.25W，6.2K；C1，10V，4.7μF；C2，10V，2.2μF；C3，10V，1μF；C4～C6，10V，10μF；V1，9012；V2V3，9013；D1～D3，1N4148；LED，φ3；IC，CD4011；ZD1，0.5W，5V。

Claims (4)

1, a kind of coded lock for push-button type telephone, it is made up of coding circuit and coding switch circuit, described coding circuit is made up of on-off circuit, delay circuit, flip-flop circuit, outside line circuits for triggering, gate trigger circuit and figure place sequential circuit, it is characterized in that:

A. 1, the 2 pin input of four inputs, the eight gate trigger circuit IC of two NAND gate compositions connects the W1 and the W3 of coding switch circuit respectively, and the input of 5,6 pin connects the W4 and the W2 of coding switch circuit respectively; Constitute the figure place sequential circuit by capacitor C 1, C2, C3 and resistance R 1, R2, R3, R4, the termination IC1 pin of R1, C1, the end of the other end and R3, C3 connects the U1 end of coding switch circuit jointly, another termination IC2 pin of R3, C3, the end of R2, C2, R4 connects the IC6 pin jointly, and an other end connects U1 and ground connection jointly; The IC bistable triggers output 8 pin by R13, the R14 machine bridge diode positive pole of answering the call, and the NAND gate that the IC bistable triggers output 13 pin and IC is exported the triode V4 colelctor electrode that 3 pin, 4 pin connect the outside line circuits for triggering jointly; IC exports R5 one end that 9 pin, 11 pin connect delay circuit;

B. form the outside line circuits for triggering by triode V4, R7, capacitor C 5, diode D3, the V4 emitter-base bandgap grading connects the IC14 pin and connects coding switch circuit U2 end by R12, the V4 base stage meets audio-frequency transformer tertiary winding M by R7, triode D3, capacitor C 5 one termination V4 emitter-base bandgap gradings, the other end be connected on that R7 connects with D3 between;

C. form delay circuit by R5, R6, R10, C4, R5 and the base stage that meets triode V1 after R6 connects, capacitor C 4 is with after R10 is in parallel, and one terminates between R5 and the R6, an other end common ground;

D. form on-off circuit by triode V1, clad pipe V2V3 and R9R8, the emitter-base bandgap grading of V1 is powered with telephone signaling integrated package by resistance R 8 and is held D to be connected, and connecing the base stage of V2 by resistance R 9, the clad pipe colelctor electrode connects the D end, the operating voltage K end of V3 emitter-base bandgap grading sending and receiving sign indicating number integrated package;

E. coding switch circuit is made up of telephone key switch and code switch device, and the code switch device is made up of sliding button, base plate, the lead-in wire dividing plate of pad between coulisse and base plate two ends that the chute in coulisse slides.

2, according to the described coded lock of claim 1, it is characterized in that powering and hold bridge switch HK2 between the lead-in wire at the operating voltage line of telephone signaling integrated package and telephone signaling integrated package, when HK2 was closed, the telephone that coded lock is housed became ordinary telephone set.

3, according to claim 1 or 2 described coded locks, it is characterized in that described sliding button is made of, conductive rubber block and two fixture blocks button, two fixture blocks are clamped conductive rubber block and are solidly connected with button is steady.

4,, it is characterized in that described coulisse and base plate are all wiring plate according to claim 1 or 2 described coded locks.

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