CN2074732U

CN2074732U - Automobile theft-proof alarm

Info

Publication number: CN2074732U
Application number: CN90214712U
Authority: CN
Inventors: 程立赜
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-06-26
Filing date: 1990-06-26
Publication date: 1991-04-10

Abstract

The utility model belongs to an automobile anti-theft alarm, comprising a switch circuit which is composed of thyristor and other electronic components, a contactor or an anti-theft net which is in series connection with the circuit and a sounding alarm circuit. The contactor or the anti-theft net can be arranged on automobile doors, engine hood panels or warehouses, when the contactor is broken or the net is unpacked, the alarm circuit can be communicated at once in order to dispatch an alarm sound. Owing to an ignition low voltage circuit of the automobile engine being cut off with the use of the anti-theft alarm, thieves can not drive the automobile away. The utility model can also be suitable for anti-theft alarming of motorbikes and security protection of finance departments, warehouses and families, which has the advantages of reliable performance, simple structure, low cost, etc.

Description

Automobile theft-proof alarm

The utility model relate to a kind of can with the burglar alarm of adapteds such as visitor, goods.

Chinese patent CN86203720 discloses the device that a kind of name is called " automobile guides switch with silicon control ", it uses silicon control, diode and trigger button are parallel with one another and insert in the automobile circuit, preventing because the chaufeur inadvertent, forgotten pass battery isolator control or electric switch and caused contingent accident.In addition, this device also can play antitheft effect, but can only prevent that robber person from driving away their vehicles, and can not report to the police, and causes facility and vehicle-borne goods in the car to be damaged or to be stolen, thereby exists deficiency.

The purpose of this utility model is to overcome the deficiencies in the prior art part, provide a kind of can with visitor, the lorry adapted burglar alarm, it can prevent that car from being stolen, and can send chimes of doom again, reminds people arrives in the very nick of time, and vehicle-mounted article are not stolen.

The purpose of this utility model is achieved in that and has promptly adopted one to be that switch circuit and the warning circuit of core constitutes annunciator jointly with the silicon control, according to silicon controlled break-make characteristic, the silicon controlled anode is added positive voltage, negative electrode adds negative voltage, ground connection after the control utmost point is connected with at least one contactless switch or anti-theft net with lead, making its current potential is zero and not conducting, arbitrary contactless switch of controlling between the utmost point and the ground is disconnected or anti-theft net is split broken in case be connected on, as long as add a forward voltage to the silicon controlled control utmost point, just can make silicon control change conducting into from blocking-up, therefore, contactless switch is placed on the car door, and engine hood panel etc. are located, and anti-theft net is covered on the goods, work as closing of the door, when anti-theft net stood intact, not conducting of silicon control was in case arbitrary car door is pried open, or anti-theft net is split broken, and annunciator sends chimes of doom immediately.

In order to prevent robber person's vehicle that drives away, two groups of switching points of a double throw switch are gone here and there respectively in transwitch circuit and car engine ignition low voltage circuit, when connecting the former, the latter just is cut off; Otherwise the former is cut off.When chaufeur leaves vehicle, double throw switch is connected the Car Burglar Alarm power supply, owing between the silicon controlled control utmost point and ground, connected one mechanical delay device or timer, in the time of time-delay, open car door and can not cause flase alarm, time one mistake of time-delay, delay timer or timer automatic switch off, circuit recovers warning function.

The utility model has following accompanying drawing:

Accompanying drawing 1 is the scheme circuit of annunciator;

Accompanying drawing 2 is the structural representation of contactless switch J;

Accompanying drawing 3 is the plan sketch of anti-theft net F.

Below in conjunction with accompanying drawing, provide preferential embodiment of the utility model.

As shown in Figure 1, between silicon control 3CT anode A and positive source, inserted one group of transfer contact of double throw switch K, silicon controlled positive C and resistance R ₃, capacitor C ₂Series connection back power connection negative pole, they are to be provided with for the self-induced e.m.f that prevents the generation of warning circuit repeat circuit coil and horn coil enters silicon control; At anode A and control utmost point G, sealed in divider resistance R respectively between control utmost point G and the power cathode ₁And R ₂, they are selected according to the size of silicon controlled trigger current and trigger voltage.C ₁Be the shunt capacitance of the control utmost point, with R ₂Parallel connection is to prevent the disturbing wave control of access utmost point.Warning circuit is connected between silicon control anode and power cathode, and it comprises a motor bike loudspeaker Y and relay J ₂, loudspeaker just send the sound, relay J after the silicon control conducting ₂The switch circuit that videocorder L is thereafter connected in adhesive can broadcast the yell of prerecording " stopping thief " immediately.Four contactless switch J are installed in respectively on the left and right door in the left and right door of automobile cab and compartment, and anti-theft net F covers on the goods, because they are cascaded, to resistance R ₂Short circuit, making 3CT is zero not conducting because of the control electrode potential, if any opens circuit in them, the current potential of control utmost point G will make the 3CT conducting by the trigger voltage that rises to above freezing.Because the control utmost point is just ineffective after the conducting, even make R again ₂Short circuit (as closing entrance door again), also of no avail, the position that annunciator will continue and connect the engine ignition low voltage circuit up to K switch is pushed.

As shown in Figure 2: contactless switch is by insulation shell (3), on the brass base (4) of the spring (2) in the housing and the contact (1) of spring (2) one end suits, fixing spring (2), and the blade tereminal on the brass base (5), and contact disk (6) constitutes.The partial sum contact disk (6) that contactless switch is equipped with contact is connected on (hinge one end that is connected on car door is more hidden) on car door and the doorframe respectively.When closing of the door, contact (1) is close to contact disk (6), and is reliable for making contact, smeared one deck conductive paste on contact disk (6) and contact (1).Install with frid or other hidden mode of connection with blade tereminal (5) bonded assembly lead.

As shown in Figure 3: anti-theft net F intersects the net of making in length and breadth with a plastics multiply copper cash (7), around it and infall, tightens with nylon rope (8).The two ends series connection of copper cash (7) in circuit, when the net arbitrary place be disconnected, whole circuit series opens circuit, and causes the silicon control conducting.

The utility model adopts 6 volts of direct supplys, and this electric current can pick out from the dc battery jar of automobile, also can adopt dry storage battery.Circuit part is contained in the box body, places shelter in the car, by lead and loudspeaker, and videocorder, contactless switch and anti-theft net connect.

The utility model has the following advantages:

1, purposes is wide, and the burglar alarm except being used for visitor, lorry and other motor vehicles such as motorcycle also can be used for family, financial department, and warehouse and other need to arrange the place of netted enclosure wall. Also can be used as gauge tap uses.

2, use safety, dependable performance.

3, simple in structure, with low cost, price is minimum in the car alarm on the present national market.

Claims

1, a kind of car alarm comprises box body and interior electronic circuit thereof etc., and it is characterized in that: electronic circuit is made up of transwitch circuit and warning circuit; The transwitch circuit is by silicon control 3CT, double throw switch K, resistance C _1～3, capacitor C _1～2, delay timer J ₁, and constitute by series connected at least one the contactless switch J of lead; Inserted one group of transfer contact of double throw switch K between silicon controlled anode A and the positive source, between anode A and the control utmost point G, sealed in divider resistance R respectively between control utmost point G and the power cathode ₁And R ₂, capacitor C ₁, mechanical delay device J ₁And with the series connected contactless switch J of lead respectively with R ₂Parallel connection, R ₃With C ₂Be connected on after the series connection between negative electrode C and the power cathode; Warning circuit is serially connected between negative electrode C and power cathode.

2, car alarm according to claim 1, it is characterized in that: contactless switch is by insulation shell (3), the spring (2) in the housing and the contact (1) of spring (2) one end suits, the brass base (4) of fixing spring (2), blade tereminal on the brass base (5) and contact disk (6) constitute.

3, car alarm according to claim 1 is characterized in that: have an anti-theft net F with lead be connected in parallel on R after contactless switch is connected ₂On; Anti-theft net F is intersected in length and breadth by a non-conductive multiply copper cash (7) and makes, and around it and infall tighten with nylon rope (8), two exits by copper cash (7) are connected with circuit.