Electronic door wedge alarm
First Claim
1. An alarm device for use with a hinged, inwardly-opening door, comprising:
- a bottom chassis member comprising a first rectangular segment, said bottom chassis member having a front end including a first side of said first rectangular segment and a back end including a second side of said first rectangular segment, said second side of said first rectangular segment being opposite said first side of said first rectangular segment;
a top chassis member comprising a second rectangular segment, said top chassis member having a front end including a first side of said second rectangular segment and a back end including a second side of said second rectangular segment, said second side of said second rectangular segment being opposite said first side of said second rectangular segment;
means for mounting said top chassis member on said bottom chassis member to form a wedge-shaped assembly with the thin edge of said wedge-shaped assembly defined by said first sides of said first and second rectangular segments and the thick edge of said wedge-shaped assembly being defined by said second sides of said first and second rectangular segments, said second sides of said rectangular segments being relatively moveable toward and away from each other;
means for biasing said second sides of said first and second rectangular segments away from each other;
switch means for triggering said alarm device when said second ends of said first and second rectangular segments move toward each other;
an audio transducer; and
an alarm circuit electrically connected to said switch means and to said audio transducer, said alarm circuit causing said audio transducer to emit an alarm signal whenever said switch means operates to trigger said alarm device.
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Accused Products
Abstract
A wedge-shaped device for use as an alarm for detecting the unauthorized opening of a hinged, inwardly-opening door may be easily installed at the base of the door to resist forced opening of the door while simultaneously sounding a highly audible alarm signal indicative of an attempt to break in. The device uses a top chassis mounted on a bottom chassis to initiate the alarm whenever the top chassis is forced downwardly onto the bottom chassis, and the alarm will continue to sound until the device is reset. The device maintains its wedge shape even after the top chassis is forced down onto the bottom chassis, thereby effectively preventing the door from opening inwardly until the device is removed from its position at the base of the door.
22 Citations
27 Claims
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1. An alarm device for use with a hinged, inwardly-opening door, comprising:
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a bottom chassis member comprising a first rectangular segment, said bottom chassis member having a front end including a first side of said first rectangular segment and a back end including a second side of said first rectangular segment, said second side of said first rectangular segment being opposite said first side of said first rectangular segment; a top chassis member comprising a second rectangular segment, said top chassis member having a front end including a first side of said second rectangular segment and a back end including a second side of said second rectangular segment, said second side of said second rectangular segment being opposite said first side of said second rectangular segment; means for mounting said top chassis member on said bottom chassis member to form a wedge-shaped assembly with the thin edge of said wedge-shaped assembly defined by said first sides of said first and second rectangular segments and the thick edge of said wedge-shaped assembly being defined by said second sides of said first and second rectangular segments, said second sides of said rectangular segments being relatively moveable toward and away from each other; means for biasing said second sides of said first and second rectangular segments away from each other; switch means for triggering said alarm device when said second ends of said first and second rectangular segments move toward each other; an audio transducer; and an alarm circuit electrically connected to said switch means and to said audio transducer, said alarm circuit causing said audio transducer to emit an alarm signal whenever said switch means operates to trigger said alarm device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An alarm device for use with a hinged, inwardly-opening door, comprising:
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a bottom chassis member comprising a first rectangular segment, said bottom chassis member having a front end including a first side of said first rectangular segment and a back end including a second side of said first rectangular segment, said second side of said first rectangular segment being opposite said first side of said first rectangular segment, said bottom chassis member also comprising first and second wedge-shaped side members each having a thin end and a thick end, said first and second side members being mounted on the sides of said first rectangular segment between said first and second sides thereof, said thin ends of said first and second wedge-shaped side members being located adjacent said first side of said first rectangular member and said thick ends of said first and second wedge-shaped side members being located adjacent said second side of said first rectangular member, said first and second wedge-shaped side members extending upward from said first rectangular member; a non-slip pad mounted on the bottom of said first rectangular segment; a top chassis member comprising a second rectangular segment, said top chassis member having a front end including a first side of said second rectangular segment and a back end including a second side of said second rectangular segment, said second side of said second rectangular segment being opposite said first side of said second rectangular segment, said top chassis member also comprising third and fourth wedge-shaped side members each having a thin end and a thick end, said third and fourth side members being mounted on the sides of said second rectangular segment between said first and second sides thereof, said thin ends of said third and fourth wedge-shaped side members being located adjacent said first side of said second rectangular member and said thick ends of said third and fourth wedge-shaped side members being located adjacent said second side of said second rectangular member, said third and fourth wedge-shaped side members extending downward from said second rectangular member, said first rectangular member being narrower than said second rectangular member, said third wedge-shaped side member partially overlapping said first wedge-shaped side member and said fourth wedge-shaped side member partially overlapping said second wedge-shaped side member; means for mounting said top chassis member on said bottom chassis member to form a wedge-shaped assembly with the thin edge of said wedge-shaped assembly defined by said first sides of said first and second rectangular segments and the thick edge of said wedge-shaped assembly being defined by said second sides of said first and second rectangular segments, said second sides of said rectangular segments being relatively moveable toward and away from each other; means for biasing said second sides of said first and second rectangular segments away from each other; switch means for triggering said alarm device when said second ends of said first and second rectangular segments move toward each other; an audio transducer; and an alarm circuit electrically connected to said switch means and to said audio transducer, said alarm circuit causing said audio transducer to emit an alarm signal whenever said switch means operates to trigger said alarm device.
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21. An alarm device for use with a hinged, inwardly-opening door, comprising:
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a bottom chassis member comprising a first rectangular segment, said first rectangular segment having a first side and a second side, said second side of said first rectangular segment being opposite said first side of said first rectangular segment; a top chassis member comprising a second rectangular segment, said second rectangular segment member having a first side and a second side, said second side of said second rectangular segment being opposite said first side of said second rectangular segment; means for mounting said top chassis member on said bottom chassis member to form a wedge-shaped assembly with the thin edge of said wedge-shaped assembly defined by said first sides of said first and second rectangular segments and the thick edge of said wedge-shaped assembly being defined by said second sides of said first and second rectangular segments, said second sides of said rectangular segments being relatively moveable toward and away from each other; means for biasing said second sides of said first and second rectangular segments away from each other; switch means for triggering said alarm device when said second ends of said first and second rectangular segments move toward each other; an audio transducer; and an alarm circuit electrically connected to said switch means and to said audio transducer, said alarm circuit causing said audio transducer to emit an alarm signal whenever said switch means operates to trigger said alarm device.
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22. An alarm device for use with a hinged, inwardly-opening door, comprising:
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a wedge-shaped bottom chassis member having two opposed wedge-shaped sides, said bottom chassis member having a thin front end and a thick back end, said bottom chassis member being hollow and open on the top thereof; a wedge-shaped top chassis member having two opposed wedge-shaped sides, said bottom chassis member having a thin front end and a thick back end, said top chassis member being hollow and open on the bottom thereof, said top chassis member being mounted on top of said bottom chassis member with said thick back end of said top chassis member being moveable toward and away from said thick back end of said bottom chassis member; means for urging said thick end of said top chassis member away from said thick end of said bottom chassis member; electrical switch means for triggering said alarm device, said electrical switch means having an open position and a closed position, said electrical switch means being driven from said open position to said closed position when said thick back end of said top chassis member is driven toward said thick back end of said bottom chassis member; an audio transducer located in said bottom chassis member; and an alarm circuit located in said bottom chassis member, said alarm circuit being electrically connected to said electrical switch and said audio transducer, said alarm circuit causing said audio transducer to emit an alarm signal whenever said electrical switch means has been driven to said closed position.
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23. An alarm device for use with a hinged, inwardly-opening door, comprising,
(a) a bottom chassis member having a front end and a rear end, (b) a top chassis member having a front end and a rear end, (c) hinge means interconnecting the front end of said top chassis member to the front end of said bottom chassis member, (d) means for biasing the rear end of said bottom chassis member from the rear end of said top chassis member, (e) an alarm assembly connected to said bottom chassis member, including a switch connected to said top chassis member and an audio transducer connected to said switch, (f) whereby movement of said rear end of said top chassis member towards said bottom chassis member moves said switch to activate said audio transducer.
Specification