Theft preventive apparatus and radio wave receiving signaling device
First Claim
1. A theft preventive apparatus in which preliminary act detecting means (SD) for detecting a preliminary theft act is provided inside a box (2) to be attached to an object of theft prevention;
- the box (2) accommodates therein alarm output means (AO) for outputting an alarm responsive to detection of a preliminary theft act by the preliminary act detecting means (SD), retaining means (VK) for retaining the alarm output means (AO) in an operative state thereof, and alarm releasing means (R) for stopping the operation of the alarm output means (AO);
an insertion hole (45) for a releasing operation is defined in the box (2) extending from an outer periphery thereof to the inside of the box; and
the alarm releasing means (R) is adapted to be placed into an alarm releasing state by means of a bar-like releasing tool (K) to be inserted into the insertion hole (45);
wherein the apparatus is characterized in that;
the retaining means (VK) is comprised of an electric retaining circuit to be set to the retaining state;
the alarm releasing means (R) is comprised of a retention releasing instruction switch for instructing a retention release to the electric retaining circuit (VK) in the form of an electric signal;
the preliminary act detecting means (SD) includes an antenna (22) disposed inside the box (2) for receiving a radio wave transmitted from a transmitter (O) installed at a predetermined site; and
the alarm output means (AO) outputs the alarm information based on a reception signal from the antenna (22).
1 Assignment
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Accused Products
Abstract
A theft preventative apparatus is used to detect an attempted theft of an object and produce an audible alarm when an antenna (22) in the apparatus receives a radio wave signal from a transmitter (0). The apparatus can be deactivated using a bar-like releasing tool (K) inserted into the housing. Attempted theft can also be detected using a length of electrically conductive wire (3) securable to the object to be protected. The ends (30) of the wire are mounted to the housing. Disruption of the electrical path, such as by cutting the wire or removing one of the ends (30) from the housing, causes the audible alarm to be produced.
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Citations
40 Claims
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1. A theft preventive apparatus in which preliminary act detecting means (SD) for detecting a preliminary theft act is provided inside a box (2) to be attached to an object of theft prevention;
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the box (2) accommodates therein alarm output means (AO) for outputting an alarm responsive to detection of a preliminary theft act by the preliminary act detecting means (SD), retaining means (VK) for retaining the alarm output means (AO) in an operative state thereof, and alarm releasing means (R) for stopping the operation of the alarm output means (AO); an insertion hole (45) for a releasing operation is defined in the box (2) extending from an outer periphery thereof to the inside of the box; and the alarm releasing means (R) is adapted to be placed into an alarm releasing state by means of a bar-like releasing tool (K) to be inserted into the insertion hole (45);
wherein the apparatus is characterized in that;the retaining means (VK) is comprised of an electric retaining circuit to be set to the retaining state; the alarm releasing means (R) is comprised of a retention releasing instruction switch for instructing a retention release to the electric retaining circuit (VK) in the form of an electric signal; the preliminary act detecting means (SD) includes an antenna (22) disposed inside the box (2) for receiving a radio wave transmitted from a transmitter (O) installed at a predetermined site; and the alarm output means (AO) outputs the alarm information based on a reception signal from the antenna (22). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A radio wave receiving signaling device comprising:
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a radio wave receiving antenna (22) having a coil (22a), an electrically capacitive buzzer (21); and alarm output means (AO) for activating the buzzer (21) to generate sound when the receiving antenna (22) receives a sound generation instructing signal; wherein the buzzer (21) and the entire or part of the coil (22a) of the receiving antenna (22) are connected to form a resonance circuit.
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Specification