Anti-theft screen construction
First Claim
1. A partially conductive security screen arrangement for use with an intrusion alarm system designed to operate in a normally closed sensing circuit condition and to produce a warning signal when the sensing circuit is broken, said arrangement comprising:
- screen apparatus including a frame defining a central aperture, screening material comprising a mesh of interwoven strands covering said aperture and having a plastic coating, and means for securing the periphery of said screening material to said frame to close said aperture, said screen apparatus positionable to cover an opening in a building;
electrically conductive means continuous between two ends thereof, including wire means having a plastic coating and at least partially overlying said screen apparatus, said wire means being bonded to the screening material by thermal fusing of the respective plastic coatings to prevent passage of a human being through said aperture unless said conductive means is severed,means for connecting said conductive means at the two ends thereof into the sensing circuit as a series element thereof;
whereby passage of a human being through the opening for said screen apparatus in position to cover said opening breaks the sensing circuit.
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Accused Products
Abstract
A partially conductive security screen arrangement for use with an intrusion alarm system designed to operate in a normally closed sensing circuit condition and to produce a warning signal when the sensing circuit is broken, which arrangement includes conductive means overlying and bonded to a mesh screen positionable to cover an opening in a building. The conductive means is connectible at its two ends to the sensing circuit in a series relationship with the remainder of that circuit. The conductive means is positioned on the screen in a configuration preventing passage of a human being through the screen unless the conductive means is severed. Passage of a human being through the opening while the screen is in position to cover the opening therefore breaks the sensing circuit to produce a warning signal. One or more electrical switches located within a frame at the periphery of the screen may also be connected in a series relationship with the remainder of the sensing circuit, the switches being adapted to close for the screen in position covering the opening in the building and to open for the screen moved out of that position. The conductive means may include a plurality of parallel longitudinal lengths of wire connected in series with each other and with one or more transverse lengths of wire. The respective lengths of wire may be mechanically interlocked with each other and with the mesh screen at the points of intersection therebetween.
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Citations
28 Claims
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1. A partially conductive security screen arrangement for use with an intrusion alarm system designed to operate in a normally closed sensing circuit condition and to produce a warning signal when the sensing circuit is broken, said arrangement comprising:
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screen apparatus including a frame defining a central aperture, screening material comprising a mesh of interwoven strands covering said aperture and having a plastic coating, and means for securing the periphery of said screening material to said frame to close said aperture, said screen apparatus positionable to cover an opening in a building; electrically conductive means continuous between two ends thereof, including wire means having a plastic coating and at least partially overlying said screen apparatus, said wire means being bonded to the screening material by thermal fusing of the respective plastic coatings to prevent passage of a human being through said aperture unless said conductive means is severed, means for connecting said conductive means at the two ends thereof into the sensing circuit as a series element thereof; whereby passage of a human being through the opening for said screen apparatus in position to cover said opening breaks the sensing circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A partially conductive security screen arrangement for use with an intrusion alarm system designed to operate in a normally closed sensing circuit condition and to produce a warning signal when the sensing circuit is broken, said arrangement comprising:
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screen apparatus including a frame defining a central aperture, screening material comprising a mesh of interwoven strands covering said aperture and means for securing the periphery of said screening material to said frame to close said aperture, said screen apparatus positionable to cover an opening in a building; electrically conductive means continuous between two ends thereof, including wire means similar in appearance to said strands at least partially overlying said screen apparatus and bonded thereto to prevent passage of a human being through said aperture unless said conductive means is severed, said wire means including at least two lengths of wire extending across said frame and intersecting within the aperture, said lengths of wire being electrically connected in series with each other; means for mechanically interlocking said at least two lengths of wire with each other and said screening material at the points of intersection of the lengths of wire, such that an attempt to separate said lengths of wire from each other or from said screening material will break the sensing circuit; and means for connecting said conductive means at said two ends thereof into the sensing circuit as a series element thereof; whereby passage of a human being through the opening for said screen apparatus in position to cover said opening breaks the sensing circuit. - View Dependent Claims (20, 21, 22)
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23. A partially conductive security screen arrangement for use with an intrustion alarm system designed to operate in a normally closed sensing circuit condition and to produce a warning signal when the sensing circuit is broken, said arrangement comprising:
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screen apparatus including a frame defining a central aperture, screening material comprising a mesh of interwoven strands covering said aperture and means for securing the periphery of said screening material to said frame to close said aperture, said screen apparatus positionable to cover an opening in a building; electrically conductive means continuous between two ends thereof, including wire means similar in appearance to said strands at least partially overlying said screen apparatus and bonded thereto to prevent passage of a human being through said aperture unless said conductive means is severed, said wire means including a series of parallel longitudinal lengths of wire extending between opposite ends of said frame and at least one transverse length of wire extending between opposite sides of said frame in a direction intersecting the longitudinal lengths substantially perpendicularly within the aperture, said longitudinal and transverse lengths of wire being electrically connected in series with each other; means for mechanically interlocking said at least one transverse length of wire with said longitudinal lengths of wire and said screening material at the points of intersection of the lengths of wire, such that an attempt to separate said lengths of wire from each other or from said screening material will break the sensing circuit; and means for connecting said conductive means at said two ends thereof into the sensing circuit as a series element thereof; whereby passage of a human being through the opening for said screen apparatus in a position to cover said opening breaks the sensing circuit. - View Dependent Claims (24, 25, 26, 27, 28)
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Specification