Anti-Tamper Devices
OwnerTracy Sharpinventor
Life of this patent
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Abstract
An anti-tamper device for detecting relative movement between a part (25) having a stud (12; 83) clamped to a mounting (24) by a nut (13; 55). The nut (13; 55) holds a sensor (7, 8, 9, 10; 41, 52, 54) in a conductive condition but, when the part (25) is removed from the mounting (24), the sensor (7, 8, 9, 10; 41, 52, 54) becomes non-conductive. A circuit is provided to provide and detect the change of state of the sensor to provide an alarm. The device may be used to detect the removal of a keypad from a mounting.
Claims19
An anti-tamper device for detecting relative movement between a part and a mounting to which the part is clamped by fixing means from said clamped disposition comprising a sensor having a first conductive condition and a second non-conductive condition, the fixing means when the part is clamped to the mounting maintaining the sensor in one said condition and, on a movement of the fixing means when the part is unclamped from said mounting allowing the sensor to adopt the other said condition, and a circuit for detecting the condition of the sensor, and for producing a signal on movement of the sensor from one condition to the other condition.
Dependencies are inferred from the claim text.