Security alarm system
First Claim
1. A security unit for mounting on a part of a goods container to be secured, the unit comprising a housing, a tamper-sensitive mechanism, a radio transmitter and an aerial within the housing arranged to receive a tamper-indicating signal from the tamper-sensitive mechanism and to transmit a corresponding radio signal to a remote radio receiver, wherein the tamper-sensitive mechanism includes an electrically conductive loop which can be closed around the part of the container to be secured, which loop extends partly inside and partly outside the housing and includes within the housing a conductive track formed on the surface of a fragile substrate, and said loop further including a vibration-sensitive switch which opens or closes when subjected to vibration or movement beyond a predetermined magnitude, the mechanism being adapted to emit a tamper-indicating signal if the loop is broken by either the fragile substrate or the vibration sensitive switch.
1 Assignment
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Accused Products
Abstract
A security unit is to be fitted to a goods container to be secured, normally to the load doors, and will transmit a radio signal when it is interfered with to a radio receiver which gives the alarm. Where the container is part of or is loaded on a vehicle, then in addition to this security for the container itself, the alarm system will have to be immobilized by an authorized driver before the vehicle can be driven by inserting two different keys in a predetermined time sequence before the vehicle can be operated.
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Citations
13 Claims
- 1. A security unit for mounting on a part of a goods container to be secured, the unit comprising a housing, a tamper-sensitive mechanism, a radio transmitter and an aerial within the housing arranged to receive a tamper-indicating signal from the tamper-sensitive mechanism and to transmit a corresponding radio signal to a remote radio receiver, wherein the tamper-sensitive mechanism includes an electrically conductive loop which can be closed around the part of the container to be secured, which loop extends partly inside and partly outside the housing and includes within the housing a conductive track formed on the surface of a fragile substrate, and said loop further including a vibration-sensitive switch which opens or closes when subjected to vibration or movement beyond a predetermined magnitude, the mechanism being adapted to emit a tamper-indicating signal if the loop is broken by either the fragile substrate or the vibration sensitive switch.
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11. A security installation comprising at least one security unit having a housing to be removably mounted on a part of a goods container to be secured,
the housing containing a tamper-sensitive mechanism which includes an external flexible insulated wire with a plug at its free end and a socket on the housing for receiving the plug, an internal conductive track formed on the surface of a fragile substrate and a vibration-sensitive switch which opens or closes when subjected to vibration or movement beyond a predetermined magnitude, and a radio transmitter arranged to receive a tamper-indicating signal from the tamper-sensitive mechanism and to transmit a corresponding radio signal to a remote radio receiver, and a storage unit for storing said at least one security unit, the storage unit having a socket into which the security unit plug can be placed to connect the security unit into a circuit, and data inputting means associated with the circuit so that an alarm signal is initiated if the security unit plug is removed from the storage unit socket prior to the correct data having been input.
Specification