CN2404388Y

CN2404388Y - Theft-proof bag

Info

Publication number: CN2404388Y
Application number: CN99229372.3U
Authority: CN
Inventors: 赵兵玉
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-09-06
Filing date: 1999-09-06
Publication date: 2000-11-08
Anticipated expiration: 2009-09-06

Abstract

The utility model relates to a theft-proof bag, which adds an anti-theft circuit at the inner part of a common bag. A power source switch of the anti-theft circuit (namely, an anti-theft switch) is arranged on belts of the bag; anti-theft wires of the anti-theft circuit are wound on the inner walls of the bag; the anti-theft wires are provided with contact switches which are arranged on the opening position of the bag. When power source is switched off, alarming sounds can not be sent out by optionally opening the bag; when the power source is switched on, the points of a and b of the anti-theft wires are in short circuit, the bag is in an anti-theft state, the alarming sounds can be sent by that the anti-theft wires are broken when the bag is opened or is cut, 3AX31B transistors are simultaneously switched on, and load starts to work.

Description

Antitheft bag

The utility model relates to a kind of electromechanical anti-theft circuit.

At present, stolen phenomenon does not often take place because of it has anti-theft measure in known various bag classes, has brought a lot of losses to the user.

The purpose of this utility model provides a kind of antitheft bag, when it is illegally opened or cut at bag, can sound the alarm, thereby reach antitheft purpose.

The purpose of this utility model is achieved in that dress lastblock anti-theft circuit in common bag, the power switch (switch of promptly deploying troops on garrison duty) of anti-theft circuit is arranged on the band, anti-theft wire with anti-theft circuit, be wrapped on the inwall of bag, and anti-theft wire is provided with contact-making switch, contact-making switch is arranged in the place of bagmouths open.When power switch disconnected, whole anti-theft circuit was not worked because of no current, can not sound the alarm so can arbitrarily open bag.After power switch closes, bag is in the state of deploying troops on garrison duty, anti-theft wire ab short circuit this moment, the base voltage of 3DG201 triode is 0 volt, so the 3DG201 triode is not worked, the 3AX31B triode of using as load switch presents off state because of no cut-in voltage, so load is not worked, can not sound the alarm, when bag was opened, the contact-making switch on the anti-theft wire disconnected thereupon; Maybe when bag when being cut, be wrapped in that anti-theft wire also will be by secant on the bag inwall, anti-theft wire ab presents and opens circuit, triode 3DG201 conducting work this moment, the negative voltage that colelctor electrode is used to 3AX31B triode feeding opening makes the 3AX31B conducting, load is started working, and sounds the alarm.Load is made up of integrated circuit and a loudspeaker of alarm song a storage.

Owing to adopt such scheme, can when bag is stolen, sound the alarm, in time remind owner, thereby reach antitheft purpose.

Below in conjunction with accompanying drawing utility model is further specified.

Fig. 1 is circuit theory diagrams of the present utility model

Fig. 2 is the layout schematic diagram of power switch and anti-theft wire

3. polar capacitor of 1. power supplys, 2. power switches (switch of deploying troops on garrison duty) among the figure

4.3AX31B triode 5.3DG201 triode 6. 10K resistance

7. electric capacity 8. 1K resistance 9. integrated circuits

10. loudspeaker 11. contact-making switches

Among Fig. 1, also source (1), polar capacitor (3), triode 3AX31B (4), triode 3DG201 (5), resistance (6), electric capacity (7), resistance (8), integrated circuit (9), loudspeaker (10) can be assembled in a circuit and extremely go up.Polar capacitor (3) is used for filter thorn ripple, impact of interference ripple usefulness, and electric capacity (7) and resistance (8) are used for feedback effect, can carry the circuit working stability.

Among Fig. 2, power switch (2) is arranged in the inboard in the middle of the band, and this position is difficult for being touched by other people when carrying bag, thereby can improve the anti-theft of bag, and the general slide fastener with the bag mouth of contact-making switch (11) is combined.

In Fig. 1, power supply (1) is selected 3 volts of batteries of direct current for use.Polar capacitor (3) in parallel with power supply (1) it in circuit, play filter thorn ripple and the effect of impact of interference ripple.Usually polar capacitor (3) is selected 47 microfarads for use.Be connected with a resistance (6) between the base stage of the emitter stage of 3AX31B triode (4) and 3DG201 triode (5).The resistance of resistance (6) is about 10 kilo-ohms.Electric capacity (7) and resistance (8) play feedback effect, are used for improving circuit working stability.Integrated circuit (9) is an integrated circuit that stores alarm song, and it and loudspeaker (10) are jointly as the load of circuit.When power switch (2) disconnected, circuit remained static because of no current; When power switch (2) when closing, circuit is in the state of deploying troops on garrison duty because of having certain voltage.At this moment, antitheft metal wire ab is with the base stage and the emitter stage short circuit of 3DG201 triode (5), so 3DG201 triode (5) is in cut-off state.3AX31B triode (4) also is in cut-off state because of no cut-in voltage, and load is not worked.When antitheft metal wire ab disconnected, the base stage of 3DG201 triode (5) and emitter stage were because of having certain pressure reduction conducting work, and colelctor electrode begins to supply with negative voltage to 3AX31B triode (4) makes 3AX31B triode (4) conducting work.At this moment, load is started working because of having certain voltage, sounds the alarm.

In the embodiment shown in Figure 2, power supply (1), polar capacitor (3), 3AX31B triode (4), 3DG201 triode (5), resistance (6), electric capacity (7), resistance (8), integrated circuit (9), loudspeaker (10) are assembled on the circuit board.Power switch (2) is arranged on the position of band inboard, and this position is difficult for being touched by other people when carrying bag.Antitheft metal wire ab twines the inboard that is arranged in bag according to certain rules.Contact-making switch (11) on the antitheft metal wire ab is arranged together with the slide fastener or the button of bag mouth.

Claims

1. antitheft bag, it is characterized in that: dress lastblock anti-theft circuit in common bag, the power switch (switch of promptly deploying troops on garrison duty) of anti-theft circuit is arranged on the band, anti-theft wire with anti-theft circuit, be wrapped on the inwall of bag, and anti-theft wire is provided with contact-making switch, contact-making switch is arranged in the place of bagmouths open.

2. antitheft bag according to claim 1 is characterized in that the power switch of anti-theft circuit is arranged on the inboard position intermediate of band.