GB2057173A - Anti-theft and anti-burglar portable alarm device - Google Patents

Abstract

An anti-theft and anti-burglar portable alarm device includes a housing on the front of which a Doppler effect microwave unit (23) is mounted; a panel carrying a sensitivity control, an on/off switch and a "ready alarm" indicator light; an a.c. back up battery power supply (20, 21); and a mechanical detector (27) of physical movement of the device set to trigger an alarm (26) in the event that the device is removed when in the surveillance position. <IMAGE>

Description

SPECIFICATION Anti-theft and anti-burglar portable alarm device This invention deals with an anti-theft and antiburglar portable alarm device.

The anti-theft and anti-burlar alarm device of the microwave type, which put to use the Doppler effect when a person moves within an area protected by a by a microwave beam, are well known. These known devices are fit for fixed installations, are calibrated upon installation and therefore are "rigid" in their operation. Furthermore the protection area cannot be easily varied by the user.

The purpose of this invention is to provide a portable device of the type mentioned, fit for setting up a serveillance area, the sensitivity and location easily presettable by the user, intended for protecting "strategic" areas which can be easily varied by the user simply changing the orientation of the device and/or its sensitivity.

In accordance with this invention the device comprises a housing on front of which a Doppler effect microwave unit is mounted; a panel carrying the controls of the sensitivity of the alarm activation and switching off system, "ready alarm" light indicators; battery operated power supplies, a siren and the equipment physical movement mechanical detector set to release the alarm in the event the equipment is removed from the surveillance position. There is also included in the device a timer system to provide the delay logic to the activation and sending of the alarm signal.

This invention will henceforth be described with reference to a preferred embodiment which is intended to be illustrative but not restrictive, and on the basis of the Figures shown in the attached drawings, in which: Figure 1 shows an overall view of the equipment in accordance with the invention; Figure 2 shows a "transparent" view which shows the arrangement of the internal elements of the equipment shown in Figure 1; Figure 3 shows in particular the controls located on the control panel; Figure 4 shows the block circuit diagram of the equipment in accordance with the invention; and Figure 5shows a flow-chart illustrating the operation of the device in accordance with the invention.

With reference to Figure 1,the device as external structure comprises a housing 1 with a front panel 2 on which a window 3 is for the microwave device which emits the surveillance beam; a panel 4 comprising controls and indicators which will be better described further on; an upper panel 5 with a grid opening 6 in proximity of the alarm siren; and a handle 7 for its transport.

With reference to Figure 2, the internal structure comprises a microwave unit 10, a rechargeable battery 11, a transformer and related power supply 12, a printed circuit board 13 comprising the system electronics, a panel 14 supporting the controls and indicators, and a siren 15 which provides the aural alarm.

With reference to Figure 3 it will be henceforth described in detail panel 14 and related controls and indicators.

On panel 14 two light indicators 15, 16 are provided for checking the device sensitivity and to indicate the "ready" condition, respectively, a device sensitivity control knob 17, a test push-button 18 and a key switch 19 for the alarm system activation and switching off.

With reference to Figure 4 there will now be described the electrical diagram of the alarm device in accordance with the invention. As it is shown in this Figure, an a.c. power supply 20 with accumulator 21 is provided for.

A switch 22 controls the electronics power supply.

The device proper includes a Doppler effect microwave unit 23 of a well known type which drives timer 24 to control operating times according to a flowchart in Figure 5. The timer 24 drives an oscillator amplifier 25 which in turn drives a loudspeaker/siren 26. An acceleration switch 27 can also drive the oscillatonamplifier 25 so as to activate the aural alarm in case the equipment is tampered when in supervisory condition.

When the device is activated the following cperations must be made: set the equipment so that window 3 is turned to the area to be protected; press the test push-button 18 and set the sensitivity control 17 to a minimum; move atthe edge of the area to be protected and wait for a few seconds; light indicator 15 will then light up; take one step toward the device; the sensitivity indicator 15 will turn off for a few seconds indicating that the sensitivity is sufficient, otherwise repeat the operations as above; switch off the test push-button 18.

For "exit" activation insert the key into switch 19 and turn it to activate the device. The "ready" indicator 16 switches on indicating such condition and a couple of minutes are left to get away from the alarm area.

For "entry", switching off, about 15 seconds are available to turn the key on the switch 19 and then switch off the equipment.

Figure 5 shows in detail the time sequence described above.

This invention has been described with reference to presently preferred embodiment but, as it will be readily understood, changes and modifications can be made in practice without departing from the scope of the present industrial privilege.

1. Anti-theft and anti-burglar portable alarm device characterised by the fact that it includes a housing on front of which a Doppler effect microwave unit is mounted: a panel carrying the controls of the sensitivity of the alarm activation and switching off system, a "ready alarm" light indicator, a.c.

back up battery power supplies and a mechanical detector of the equipment physical movement set to trigger the alarm in the event the equipment is removed when in surveillance position.

2. Anti-theft and anti-burglar portable alarm device in accordance with the foregoing claim and substantially as illustrated and described in the

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (3)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Anti-theft and anti-burglar portable alarm device This invention deals with an anti-theft and antiburglar portable alarm device. The anti-theft and anti-burlar alarm device of the microwave type, which put to use the Doppler effect when a person moves within an area protected by a by a microwave beam, are well known. These known devices are fit for fixed installations, are calibrated upon installation and therefore are "rigid" in their operation. Furthermore the protection area cannot be easily varied by the user. The purpose of this invention is to provide a portable device of the type mentioned, fit for setting up a serveillance area, the sensitivity and location easily presettable by the user, intended for protecting "strategic" areas which can be easily varied by the user simply changing the orientation of the device and/or its sensitivity. In accordance with this invention the device comprises a housing on front of which a Doppler effect microwave unit is mounted; a panel carrying the controls of the sensitivity of the alarm activation and switching off system, "ready alarm" light indicators; battery operated power supplies, a siren and the equipment physical movement mechanical detector set to release the alarm in the event the equipment is removed from the surveillance position. There is also included in the device a timer system to provide the delay logic to the activation and sending of the alarm signal. This invention will henceforth be described with reference to a preferred embodiment which is intended to be illustrative but not restrictive, and on the basis of the Figures shown in the attached drawings, in which: Figure 1 shows an overall view of the equipment in accordance with the invention; Figure 2 shows a "transparent" view which shows the arrangement of the internal elements of the equipment shown in Figure 1; Figure 3 shows in particular the controls located on the control panel; Figure 4 shows the block circuit diagram of the equipment in accordance with the invention; and Figure 5shows a flow-chart illustrating the operation of the device in accordance with the invention. With reference to Figure 1,the device as external structure comprises a housing 1 with a front panel 2 on which a window 3 is for the microwave device which emits the surveillance beam; a panel 4 comprising controls and indicators which will be better described further on; an upper panel 5 with a grid opening 6 in proximity of the alarm siren; and a handle 7 for its transport. With reference to Figure 2, the internal structure comprises a microwave unit 10, a rechargeable battery 11, a transformer and related power supply 12, a printed circuit board 13 comprising the system electronics, a panel 14 supporting the controls and indicators, and a siren 15 which provides the aural alarm. With reference to Figure 3 it will be henceforth described in detail panel 14 and related controls and indicators. On panel 14 two light indicators 15, 16 are provided for checking the device sensitivity and to indicate the "ready" condition, respectively, a device sensitivity control knob 17, a test push-button 18 and a key switch 19 for the alarm system activation and switching off. With reference to Figure 4 there will now be described the electrical diagram of the alarm device in accordance with the invention. As it is shown in this Figure, an a.c. power supply 20 with accumulator 21 is provided for. A switch 22 controls the electronics power supply. The device proper includes a Doppler effect microwave unit 23 of a well known type which drives timer 24 to control operating times according to a flowchart in Figure 5. The timer 24 drives an oscillator amplifier 25 which in turn drives a loudspeaker/siren 26. An acceleration switch 27 can also drive the oscillatonamplifier 25 so as to activate the aural alarm in case the equipment is tampered when in supervisory condition. When the device is activated the following cperations must be made: set the equipment so that window 3 is turned to the area to be protected; press the test push-button 18 and set the sensitivity control 17 to a minimum; move atthe edge of the area to be protected and wait for a few seconds; light indicator 15 will then light up; take one step toward the device; the sensitivity indicator 15 will turn off for a few seconds indicating that the sensitivity is sufficient, otherwise repeat the operations as above; switch off the test push-button 18. For "exit" activation insert the key into switch 19 and turn it to activate the device. The "ready" indicator 16 switches on indicating such condition and a couple of minutes are left to get away from the alarm area. For "entry", switching off, about 15 seconds are available to turn the key on the switch 19 and then switch off the equipment. Figure 5 shows in detail the time sequence described above. This invention has been described with reference to presently preferred embodiment but, as it will be readily understood, changes and modifications can be made in practice without departing from the scope of the present industrial privilege. CLAIMS

1. Anti-theft and anti-burglar portable alarm device characterised by the fact that it includes a housing on front of which a Doppler effect microwave unit is mounted: a panel carrying the controls of the sensitivity of the alarm activation and switching off system, a "ready alarm" light indicator, a.c.

back up battery power supplies and a mechanical detector of the equipment physical movement set to trigger the alarm in the event the equipment is removed when in surveillance position.

2. Anti-theft and anti-burglar portable alarm device in accordance with the foregoing claim and substantially as illustrated and described in the Figures of the attached drawings.

3. Anti-theft and anti-burglar portable alarm device substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.