Local-field type article removal alarm
First Claim
1. An anti-theft device for providing an alarm in response to unauthorized movement of an article of property through a localized field comprising an alarm device adapted to be affixed to the article, the alarm device comprising:
- motion detection means;
field detection means; and
means responsive to the motion detection means and the field detection means, for triggering the alarm if, and only if (a) the field detection means detects the localized field and thereafter ceases to detect the localized field, and (b) the motion detection means detects motion of the article during a predetermined delay interval following the time at which the field detection means ceases to detect the localized field.
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Accused Products
Abstract
A currency alarm pack especially adapted for use in the cash supply of an automatic teller machine comprises a motion detector, an exit field detector, a smoke generating device, and electronic circuitry, responsive to the motion detector and the field detector, for triggering the smoke generator if, and only if, the field detector detects the exit field and thereafter ceases to detect the exit field, and the motion detector detects motion of the alarm pack during a predetermined delay interval following the time at which the field detector ceases to detect the exit field.
29 Citations
6 Claims
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1. An anti-theft device for providing an alarm in response to unauthorized movement of an article of property through a localized field comprising an alarm device adapted to be affixed to the article, the alarm device comprising:
- motion detection means;
field detection means; and
means responsive to the motion detection means and the field detection means, for triggering the alarm if, and only if (a) the field detection means detects the localized field and thereafter ceases to detect the localized field, and (b) the motion detection means detects motion of the article during a predetermined delay interval following the time at which the field detection means ceases to detect the localized field. - View Dependent Claims (2, 3)
- motion detection means;
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4. An anti-theft device for providing an alarm in response to unauthorized movement of an article of property through a localized field comprising an alarm device adapted to be affixed to the article, the alarm device comprising:
- motion detection means;
field detection means;
timing means;
triggerable means for providing an alarm; and
logic means, responsive to the timing means, the motion detection means and the field detection means, for triggering the triggerable means if, and only if (a) the field detection means detects the localized field and thereafter ceases to detect the localized field, and (b) the motion detection means detects motion of the article during a predetermined delay interval following the time at which the field detection means ceases to detect the localized field.
- motion detection means;
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5. An anti-theft device for providing an alarm in response to unauthorized movement of an article of property through a localized field comprising an alarm device adapted to be affixed to the article, the alarm device comprising:
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motion detection means providing a signal in response to the occurrence of predetermined motions of the article; field detection means providing a signal when the detection means is in proximity to a localized field; timing means responsive to the field detection means for establishing a delay interval following the time at which the field detection means ceases to detect the localized field; triggerable means for providing an alarm; and logic means, responsive to the timing means and to the signals provided by the motion detection means and the field detection means, for triggering the triggerable means if, and only if;
(a) the field detection means detects the localized field and thereafter ceases to detect the localized field; and
(b) the motion detection means detects motion of the article during the delay interval.
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6. An anti-theft system for use in conjunction with an automatic teller machine having an access door for providing an alarm in response to unauthorized movement of currency from the machine through the access door comprising:
- means providing a localized field;
means for activating the field when the access door is opened; and
an alarm device incorporated in the currency supply of the automatic teller machine, the alarm device comprising motion detection means, field detection means, and means responsive to the motion detection means and the field detection means, for triggering the alarm if, and only if (a) the field detection means detects the localized field and thereafter ceases to detect the localized field, and (b) the motion detection means detects motion of the alarm device during a predetermined delay interval following the time at which the field detection means ceases to detect the localized field.
- means providing a localized field;
Specification