ALARM ASSEMBLY

ALARM ASSEMBLY

An alarm assembly 10 comprises a housing attached to a back plate 12 to define a cavity occupied by a bell or siren and a tamper detection device. The tamper detection device 14 comprises a member 16 mounted for free movement in the cavity in more than one direction in response to a body entering th...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: JOHNSON, CHRISTOPHER RUSSELL, MACEY, JOHN DENNIS
Format: Patent
Sprache:eng
Schlagworte:
ALARM SYSTEMS
BASIC ELECTRIC ELEMENTS
ELECTRIC SWITCHES
ELECTRICITY
EMERGENCY PROTECTIVE DEVICES
ORDER TELEGRAPHS
PHYSICS
RELAYS
SELECTORS
SIGNALLING
SIGNALLING OR CALLING SYSTEMS
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Beschreibung
Zusammenfassung:An alarm assembly 10 comprises a housing attached to a back plate 12 to define a cavity occupied by a bell or siren and a tamper detection device. The tamper detection device 14 comprises a member 16 mounted for free movement in the cavity in more than one direction in response to a body entering the cavity or movement of the housing. The member 16 comprises a magnet 22 which is repelled by another magnet 40 so as to be movable between a metastable rest position and a disturbed position. A sensor 42 senses when the member 10 is in the disturbed position and causes the bell or siren to be set off.