Classifications

• • G—PHYSICS
  • G08—SIGNALLING
  • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
  • G08B13/00—Burglar, theft or intruder alarms
  • G08B13/02—Mechanical actuation
  • G08B13/08—Mechanical actuation by opening, e.g. of door, of window, of drawer, of shutter, of curtain, of blind
• • G—PHYSICS
  • G07—CHECKING-DEVICES
  • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
  • G07C9/00—Individual registration on entry or exit
  • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
  • G07C9/00182—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks
• • G—PHYSICS
  • G07—CHECKING-DEVICES
  • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
  • G07C9/00—Individual registration on entry or exit
  • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
  • G07C2009/00753—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys
  • G07C2009/00769—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means
• • G—PHYSICS
  • G07—CHECKING-DEVICES
  • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
  • G07C2209/00—Indexing scheme relating to groups G07C9/00 - G07C9/38
  • G07C2209/08—With time considerations, e.g. temporary activation, valid time window or time limitations

Definitions

• the present invention relates to a self-protected closing device for the protection against theft of objects contained in enclosures, such as displays, cupboards, or even desks.
• these closing means are mounted on the outside of the doors by means of relatively voluminous fixing devices and therefore unattractive.
• these closing means are unreliable.
• the alarm systems associated with these closing means are usually of the electro-magnetic type. They involve a magnet integral with the door, which cooperates with a magnetic relay mounted on a fixed wall of the display case and connected to a detection circuit. Thus, in the closed position of the door, the relay solicited by the magnet, switches to the open position and cuts the alarm circuit. On the other hand, during an unauthorized opening of the door (the alarm circuit being armed), the relay which is no longer influenced by the magnet, closes and triggers the alarm circuit.
• the invention therefore more particularly aims to eliminate these drawbacks.
• a locking device preferably arranged inside the enclosure and comprising two elements of the strike / lock type, one of which is secured to the door, while the other is secured to the fixed part of the enclosure, this locking device being designed so as to ensure self-locking in the closed position of the door and to pass into the unlocked position under the effect of a control signal,
• a remote control device comprising a remote control unit capable of transmitting a coded unlocking order and a receiving circuit, placed inside the enclosure and designed so as to receive the unlocking order and to decode this order to transmit a signal after recognition of the code command to unlock the lock, for a limited time
• a detection circuit delivering a signal representative of the open or closed position of the door
• a logic circuit which receives the unlocking control signal and the signal representative of the position of the door and which transmits an alarm signal in the event that the door has remained open beyond a period of time predetermined, after the release of the unlock signal.
• the unlocking signal is applied, on the one hand, to the lock, by means of a first monostable lever enabling the lock to be kept in the unlocked state for a time. sufficient to allow an operator to open the door and, on the other hand, to a second monostable flip-flop initially in state 0 which changes to state 1 following reception of the unlocking signal and which remains in this state 1 for a period T2> i before returning to state 0, this flip-flop being connected to one of the inputs of a logic circuit of the type:
• Figure 1 is a schematic representation showing all the elements used by a device according to the invention.
• Figure 2 is a schematic partial perspective view of a sliding door display case equipped with an electric lock associated with a magnetic detection device
• Figure 3 is a block diagram of the electronic circuit of the device.
• the device according to the invention involves an electric lock 1 and a door contact 2 connected to a micro alarm central 3 with remote control 4, the whole being supplied by a block d food 5.
• the door contact 2 can consist, in a conventional manner, of a magnetic relay (“reed” relay) 6 preferably mounted on the fixed part and a permanent magnet 7 fixed on the door so that in the closed position of the door, the magnet 7 is opposite and near the relay 6 and causes the opening of the latter.
• the relay 6 of this door contact could possibly be incorporated into the micro-central 3.
• the electric lock 1 may comprise an electromagnet acting on a bolt 8 of the normally closed type to bring it into the open position under the effect of an excitation current.
• the mounting of the bolt 8 on the armature of the electromagnet is designed so that when the door is closed, the bolt can be erased on the strike before engaging in or against this last to lock the door.
• This device can advantageously be used to equip a display case made using panels of glass such as that partially shown in FIG. 2 which includes a door 10 slidingly mounted in a slide 11.
• the micro-central 3 in which a magnetic relay is incorporated as well as the electric lock 1 is arranged on the shelf 12 of the display case, against the vertical upright 13 on which the sliding door 10 abuts, in closed position.
• the micro-central 3 and the latch 1 cooperate respectively with a permanent magnet 7 and a keeper 14 fixed, for example, by bonding to the inner face of the door 10.
• the keeper 14 consists of a metal part having an oblique face terminated on the side opposite to the vertical wall by a face in abutment perpendicular to the door 10.
• the electronic circuit of the alarm center can comprise, as shown in FIG. 3, a receiver 15 tuned to the transmitter included in the remote control unit 4 used to transmit a coded opening control signal.
• This receiver 15 is connected, by its output, to a control circuit successively comprising a decoder 16 and a first monostable flip-flop 18 of metastable period Ti which controls the excitation of the coil of the electromagnet of the lock 1.
• a control circuit successively comprising a decoder 16 and a first monostable flip-flop 18 of metastable period Ti which controls the excitation of the coil of the electromagnet of the lock 1.
• the remote control When an operator wishes to open the door 10 which is then locked in the closed position, he uses the remote control to transmit to the receiver 15 of the micro-central 3 (through the window) an order to open . Following its reception by the receiver 15, this control order is processed by the decoder 16 which compares it to a prerecorded code and which, if this comparison finds a match, transmits a control signal to the flip-flop 18 If this is the case, the flip-flop 18 changes state and causes the coil of the electromagnet of the lock 1 to be excited for a meta-stable period Ti provided just sufficient to allow the operator to open the door 10 without pressing, following the unlocking of lock 1.
• the change of state of the flip-flop 18 causes the change of state of a second flip-flop 19 whose period T2 corresponds to a maximum time for opening the door 10.
• This second flip-flop 19 is connected to one of the two inputs X of a logic circuit 20 which performs the function:
• the circuit of the micro-central 3 could further comprise, as indicated in dashed lines, a second logic circuit 22 of which one of the inputs is connected to the output 18, while the other input is connected to a detection device of the position of the bolt 8 of the lock 1.
• This system is designed so as to trigger an alarm in the event that, from the closed and locked position of the door 10, the bolt 8 passes into the retracted state without 'there has been an excitation of the solenoid coil.
• This solution has the advantage of avoiding that the door can be opened without triggering the alarm by neutralizing the door contact using a permanent magnet.
• the magnetic relay 6 can be designed so as to emit a signal for detecting the presence of an abnormal magnetic field such as that produced by a permanent magnet used outside the enclosure to obtain a forcing of the relay. This detection signal can then be applied to the input of the alarm circuit 21 in order to generate an alarm.
• the alarm circuit 21 could possibly be a radio transmitter circuit capable of transmitting the alarm signal to a radio receiver forming part of a monitoring system.
• this alarm signal can only be transmitted after reception by the alarm circuit 21 of a wake-up signal emitted by a transmitter associated with the aforesaid radio receiver.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Lock And Its Accessories (AREA)
• Burglar Alarm Systems (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9470332

Family Applications (1)

Country Status (2)

Cited By (2)

Families Citing this family (3)

Citations (6)

• 1994
  • 1994-12-28 FR FR9415769A patent/FR2728930A1/fr active Granted
• 1995
  • 1995-12-21 WO PCT/FR1995/001714 patent/WO1996020326A1/fr active Application Filing

Patent Citations (6)

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