Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1992-10-26
1996-01-23
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340505, 340542, 34082554, 70263, 70264, G08B 108
Patent
active
054868122
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a security arrangement for a building or other article such as a fixture which may incorporate doors, windows or other closures which may be secured to prevent access by unauthorised personnel. The security arrangement may also be used to detect removal or other tampering with valuable articles such as domestic electrical equipment, boats, bicycles and the like.
Conventional security arrangements for domestic or commercial premises incorporate a multiplicity of sensors connected to a control apparatus and alarm, usually by wires which transmit signals when the sensors are actuated to cause the alarm to sound. Such arrangements require the closures associated with respective sensors to be closed and locked prior to actuation of the alarm. One cannot check before switching on the alarm arrangement whether every closure is locked and then close the lock of any which are found to be unlocked without the inconvenience of leaving the control unit to do so.
Electronic security systems for buildings, motor vehicles and the like are normally either active or passive. Passive systems are arrangements which detect the presence of an intruder and sound the alarm. Active systems incorporate locking arrangements operated by a special key or digital code used by or known to authorised personnel. Although there are a great many varieties all of which have similarities in construction and operation, both kinds of arrangement possess significant disadvantages and weaknesses. Passive systems make the inherently dangerous assumption that the building or vehicle to which they are installed has been securely locked. They offer no means of deterring any unauthorised attempt to gain access, apart from the possibility that a person may be dissuaded by an indication of the presence of the alarm, such as an alarm box attached to the exterior of the building. Active systems are only usually found on access doors and do not monitor the building or vehicle to which they are fitted to confirm the effectiveness of the security arrangement.
According to a first aspect of the present invention a security arrangement comprises a control module, an alarm and a multiplicity of stations at least one station including a lock, characterised in that each station is adapted to be actuated upon receipt of a signal from the control module and incorporating a detector adapted provide a signal indicative of the status of the station, the control module being arranged to actuate the alarm upon detection of unauthorised status of the station.
The locks may be fitted to closures including doors, windows and the like, the alarm being responsive to unauthorised opening of the closure. The alarm may also be arranged to indicate whether the stations are in a desired condition for example whether the door or windows of a building are closed but not necessarily locked.
According to a preferred aspect of the present invention each station may incorporate an RF transceiver arranged to transmit and receive signals from the control module. In an alternative embodiment of the invention the station may communicate with the control module by means of electrical or fiber optic conductors.
Further preferred arrangements in accordance with this invention incorporate a plurality of RF transceivers arranged to transmit a signal received from the control module by a first station to an adjacent station in sequence. The stations of a preferred security arrangement may be arranged so that a first station receives a signal from the control module performs a function upon receipt of the signal, passes the signal to an adjacent station which in turn performs the function before relaying the signal to a third station, the signal being relayed to each station in turn and then returned to the control module to complete the cycle.
In use of a preferred embodiment the signal emitted from the control module is modified by each station in turn so that the signal returned to the module after each complete cycle provides an indication of the status of all of th
REFERENCES:
patent: 3350687 (1967-10-01), Gabrielson et al.
patent: 3445815 (1969-05-01), Saltzberg et al.
patent: 3882465 (1975-05-01), Cook et al.
patent: 4638453 (1987-01-01), Gran et al.
patent: 4703451 (1987-10-01), Calabrese
patent: 4792946 (1988-12-01), Mayo
patent: 4831374 (1989-05-01), Masel
Cedardell Limited
Crosland Donnie L.
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