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7360809 |
Kick-in resistant door reinforcing assembly
A kick-in resistant door reinforcing assembly consisting of a doorway hook having a laterally outwardly extending doorway engaging face; a jamb hook having a laterally inwardly extending jamb...
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6020816 |
Door and window lock with burglar alarm
An alarm and bolt apparatus for a building opening closure panel hingedly mounted within a perimeter frame in a building opening includes a bolt assembly having a bolt and a mechanism for extending...
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5752728 |
Alarm-triggering locking device for the catch and/or hinge region of a door or window to be protected
An alarm-triggering locking mechanism for the lock and/or hinge area of a door to be secured or a window to be secured is proposed, which is embodied as a locking plate (23) which can be attached...
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EP0772166A1 |
A system for monitoring a multiplicity of doors
A system for monitoring a multiplicity of doors including at least one optical transceiver mounted on each of the multiplicity of doors and communications apparatus for communicating with each of...
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5504325 |
System for monitoring a multiplicity of doors using multiple optical transceivers mounted on each door
A system for monitoring a multiplicity of doors including at least two optical transceivers mounted on each of the multiplicity of doors and communication apparatus for communicating with the...
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5062670 |
Lock monitor
A lock monitor for fitting to lockable objects that have locks that incorporate a bolt mechanism incuding a slidable bolt and mortise. The opening of the mortise is larger in at least one dimension...
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EP0208876A1 |
Alarm device.
1. An alarm device for protection against the forced opening of a closure structure for an enclosed space, comprising at least one electromechanical arrangement intended to be connected to an...
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4587517 |
Intrusion sensing device
An apparatus for detecting the forced opening of a door. The apparatus comprises a paper sheet with a frangible conductive path thereon. The sheet has holes therein for the passage of a retractable...
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