Security device for monitoring integrity of closed objects
First Claim
1. A security device for monitoring changes in conditions of a closed object, the device comprisingat least one sensor arranged to sense changes in conditions of the closed object in successive time points and arranged to produce an alarm signal upon occurrence of such detected changes exceeding a specified limit value,an indication unit communicating with the sensor, said indication unit comprising at least a transmitter arranged to indicate outside the closed object a presence of said alarm signal by transmitting said alarm signal, whereinsaid at least one sensor is arranged to switch off said indication unit before indicating the presence of said alarm signal if the changes detected comply with a certain reference condition.
1 Assignment
0 Petitions
Accused Products
Abstract
A security device (20) is a compact and inexpensive device for monitoring the integrity of closed objects that indicates when the state of a monitored condition inside the closed object has changed. The device (20) is small-sized so that it can also be placed inside small closed objects, e.g. a briefcase, box, envelope or alike, and that it is inconspicuous to the observer if the closed object is opened. The device (20) is relocatable inside the closed object. The device (20) comprises a controller (4) and associated memory (8), a time counter (6) in connection with the controller (4), sensors (2) communicating with the controller (4) and arranged to sense changes in conditions inside the closed object and indicating means (12) communicating with the controller (4) and arranged to wirelessly indicate invasion against the integrity of the closed object. While the changes in conditions inside the closed object comply with certain predefined conditions the alarm indication can be blocked. The alarm indication of the security device (20) can also be activated and deactivated externally by means of a remote control or automatically.
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Citations
17 Claims
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1. A security device for monitoring changes in conditions of a closed object, the device comprising
at least one sensor arranged to sense changes in conditions of the closed object in successive time points and arranged to produce an alarm signal upon occurrence of such detected changes exceeding a specified limit value, an indication unit communicating with the sensor, said indication unit comprising at least a transmitter arranged to indicate outside the closed object a presence of said alarm signal by transmitting said alarm signal, wherein said at least one sensor is arranged to switch off said indication unit before indicating the presence of said alarm signal if the changes detected comply with a certain reference condition.
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15. A security device for monitoring changes in conditions of a closed object, the device comprising
means for sensing changes in conditions of the closed object in successive time points and arranged to produce an alarm signal upon occurrence of such detected changes exceeding a specified limit value, means, communicating with the means for sensing, for indicating outside the closed object a presence of said alarm signal by transmitting said alarm signal, wherein said means for sensing is arranged to switch off said means for selecting before indicating the presence of said alarm signal if the changes detected comply with a certain reference condition.
Specification