FR2461989A1 - PORTABLE ALARM DEVICE AGAINST FLIGHT AND CAMBRIDGE - Google Patents

Abstract

THE INVENTION RELATES TO ALARM DEVICES. THE INVENTION RELATES TO A PORTABLE ALARM DEVICE WHICH INCLUDES A BOX 1 HAVING A WINDOW 3 WHICH TRANSMITS A HIGH-FREQUENCY BEAM OF WAVES, SENSITIVITY CONTROL BUTTONS AND INDICATOR LAMPS, AND A SIREN PLACED UNDER AN ORIFICE 6. DEVICE CAN BE TRANSPORTED INTO THE DESIRED SURVEILLANCE AREA AND SET UP ON THE SITE AT THE TIME OF USE. APPLICATION TO THE PROTECTION AGAINST THEFT AND BURGLARY.

Description

246 1989

  The present invention relates to a device

  Portable alarm against theft and burglary.

  We already know alarm devices

  against robbery and burglary with a hyperfre-

  quences implementing the Doppler effect obtained when a person moves in a protected area

  by a microwave wave beam. These arrangements

  known devices are provided for permanent installation, are calibrated when installed and

  so a certain "rigidity" in their operation.

  In addition, the protection zone can not be modified

easily trusted by the user.

  The invention relates to a portable device of the aforementioned type, suitable for the establishment of a surveillance zone whose sensitivity and location can be easily preset by the user.

  protection of "strategic" areas which can

  can be easily changed by the user by simply changing the orientation of the device and /

or his sensitivity.

  According to the invention, the device comprises a casing in front of which is mounted a Doppler microwave circuit, a panel carrying the alarm trigger and shutdown sensitivity controls, a "ready" indicator light , a battery-operated power supply, a siren, and a mechanical detector of a physical movement set to trigger operation of the alarm device when the apparatus is removed from the monitoring position. The device also includes a timing device for setting the trip delay after excitation and transmission of the

alarm signal.

  Other features and advantages of the invention will be better understood when reading the

  description which follows of an example of realization and

  with reference to the accompanying drawings in which

246 1989

  - Figure 1 is an overall perspective of the device according to the invention; FIG. 2 is a perspective showing the arrangement of the internal elements of the device of FIG. 1, the housing of which is shown in transparent form; - Figure 3 shows the controls placed on the control panel; FIG. 4 is a block diagram of the device according to the invention; and

  FIG. 5 is a diagram of the times

  showing the operation of the device according to

  vention. As indicated in FIG. 1, the external structure of the device comprises a casing 1 having a front panel 2 on which a window 3 allows the microwave circuit to emit the surveillance beam, a panel 4 comprising the controls and the indicator lamps, described in greater detail in the following, an upper panel 5 having a gate-shaped opening 6 near the alarm siren, and a handle 7 of transport. 1 As shown in Figure 2, the structure

  internal circuit of the device comprises a circuit 10 in hyperfre-

  quences, a battery of accumulators, a

  and an associated power supply 12, a printed circuit board 13 carrying the electronic circuit of the apparatus, a panel 14 supporting the controls and the indicator lamps, and a siren 15 which gives the signal

acoustic alarm.

  We now consider in more detail, with reference to FIG. 3, the panel 14 with the buttons

  control and associated warning lamps.

  The panel 14 comprises two indicator lamps 15, 16 intended to check the sensitivity of the device

  and to indicate that it is "ready", when settling

  performed with a sensitivity adjustment knob 17, a test button 18 and a

  key switch 19 enabling the activation of the

alarm and stop.

  We now consider, with reference to Figure 4, the electrical circuit of the alarm device according to the invention. As this figure shows, a

  alternative 20 is associated with an accumula-

21.

  A switch 22 controls the power supply of the

electric circuit.

  The device itself includes a cir-

  Doppler effect microwave 23, of well-known type, which controls the timer 24 which adjusts the operating times as shown in the timing diagram of FIG. 5. The timer

  24 controls an oscillator-amplifier 25 which supplies power to

  you in turn a circuit 26 speaker and siren.

  An acceleration switch 27 may also power the oscillator amplifier 25 so that the acoustic alarm device is energized when the device is tampered with while in operation.

monitoring condition.

  When the device is activated, the operators

  The following operations must be carried out: the adjustment of the apparatus so that the window 3 is turned towards the zone to be protected, the depression of the test pushbutton 18 and the adjustment of the sensitivity button 17 to a minimum value,

  - moving to the edge of the protected area

  and wait a few seconds, - the illumination of the indicator lamp 15, - the movement of a step towards the device, - the stopping of the indication of sensitivity 15 for a few seconds, indicating that the sensitivity is sufficient the previous operations being repeated in the opposite case, and

  - Stop push button 18 test.

  When the apparatus is to be activated prior to exit from the monitored area, the key is inserted into switch 19 and turned to activate the device. The indicator light "16" lights up and indicates this condition and there are two minutes left to exit.

the alarm zone.

  When shutting down the camera as a result of

  penetration into this zone, a period of 15

  viron is available for the rotation of the key in the

  switch 19 and for stopping the device.

  Figure 5 shows in more detail the

  temporal sequence described previously.

  Of course, various modifications may be made by those skilled in the art. device that has just been described as an example

  non-limiting without departing from the scope of the invention.

246 1989

Claims (1)

CLAIM   Portable alarm device against theft and   burglary, characterized in that it comprises a housing   tier (1) in front of which is mounted a circuit in hyper-   Doppler effect frequencies (10), a panel (4) carrying   the buttons for controlling the sensitivity of the activa-   the alarm device and the stop device, a warning lamp indicating that the device is ready, a battery power supply (21) with   charger, and a metal detector   the physical movement of the device, adjusted in   it triggers the alarm device when it   it is removed while in monitoring condition.