Alarm system to secure a passage
First Claim
1. A security system for an opening such a door or window, said opening being defined to extend within a plane by a pair of linear boundary members located on opposite sides of said opening, said system comprising:
- an elongated housing extending longitudinally along each of said linear boundary members, each of said housings comprisinga U-shaped profile strip adapted to be attached to said linear boundary members,at least one longitudinally extending groove formed in said profile strip,a cover strip attached to said profile strip,said cover strip having therein a plurality of longitudinally spaced apart holes each separated from an adjacent hole by an intermediate web,a filter member made of material permeable to infrared light extending essentially over the entire length of said housing covering each of said holes, anda plurality of mounting plates in each of said housings slidably engaged within said at least one groove and mounted in said housing to be independently selectively movable along said housing to selected positions;
at least one infrared light transmitting unit mounted in each of said housings, each unit being diagonally offset relative to a transmitting unit in the other of said housings, each of said units including at least one infrared light transmitter with at least a plurality of said infrared light transmitters being provided in each of said housings;
said plurality of infrared light transmitters being affixed to said mounting plates with each producing an infrared light beam which is limited in cross-sectional area and which is directed along a light axis extending in the plane of said opening which is offset relative to the axis of a light beam of an adjacent transmitter by an acute angle; and
at least one infrared light receiving unit provided in each of said housings, each of said units having at least one individual infrared light receiver which is affixed to said mounting plate, with said light receivers being arranged in alignment with said light transmitters in the other of said housings to receive the light beams transmitted therefrom.
1 Assignment
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Accused Products
Abstract
A security system for an opening such as a door, window, or the like wherein the opening is defined with a generally planar orientation having at least a pair of generally diametrically opposed corners, the system including light transmitters arranged in the vicinity of at least one of the corners emitting light from the one corner within an angle limited by the sides of the one corner, the light being directed across the opening in a direction toward the other of the corners, and light receivers for sensing light emitted from the light transmitters, the light receivers being arranged on at least one of the sides of the opposite corner. In one aspect of the invention, the light transmitters are arranged in the vicinity of only one of the corners and the light receivers are arranged on both sides of the opposed corner. In a second aspect of the invention, the light transmitters are arranged in the vicinity of both of the opposed corners and the light receivers are arranged on one of the sides of each of the opposed corners to receive light from the light transmitters arranged in opposed relationship thereto.
25 Citations
9 Claims
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1. A security system for an opening such a door or window, said opening being defined to extend within a plane by a pair of linear boundary members located on opposite sides of said opening, said system comprising:
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an elongated housing extending longitudinally along each of said linear boundary members, each of said housings comprising a U-shaped profile strip adapted to be attached to said linear boundary members, at least one longitudinally extending groove formed in said profile strip, a cover strip attached to said profile strip, said cover strip having therein a plurality of longitudinally spaced apart holes each separated from an adjacent hole by an intermediate web, a filter member made of material permeable to infrared light extending essentially over the entire length of said housing covering each of said holes, and a plurality of mounting plates in each of said housings slidably engaged within said at least one groove and mounted in said housing to be independently selectively movable along said housing to selected positions; at least one infrared light transmitting unit mounted in each of said housings, each unit being diagonally offset relative to a transmitting unit in the other of said housings, each of said units including at least one infrared light transmitter with at least a plurality of said infrared light transmitters being provided in each of said housings;
said plurality of infrared light transmitters being affixed to said mounting plates with each producing an infrared light beam which is limited in cross-sectional area and which is directed along a light axis extending in the plane of said opening which is offset relative to the axis of a light beam of an adjacent transmitter by an acute angle; andat least one infrared light receiving unit provided in each of said housings, each of said units having at least one individual infrared light receiver which is affixed to said mounting plate, with said light receivers being arranged in alignment with said light transmitters in the other of said housings to receive the light beams transmitted therefrom. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification