Combination lock monitoring system
First Claim
1. A monitoring system for a combination lock which includes a first apertured, rotatable combination wheel, a withdrawable lock bolt mechanism, and a lock drop arm enterable within the aperture in said wheel to permit withdrawal of said bolt mechanism, said monitoring system comprising two optical sensors each incorporating an LED and a light sensing detector fixed with respect to the combination lock and focused on respective regions of the combination lock corresponding to a face of the rotatable combination wheel and a location occupied by a part of the lock bolt mechanism when withdrawn or otherwise by part of the lock drop arm when not entered within the aperture of said wheel, said face of the combination wheel having both light reflecting and non-reflecting areas and said parts of the lock bolt mechanism and said lock drop arm each having an area one of which areas is light reflecting and the other is non-reflecting, and electronic means responding to the combined response state of said optical sensors to provide an indication of the operated condition of the combination lock.
1 Assignment
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Accused Products
Abstract
A combination lock monitoring system for recognizing and indicating electronically the condition of operation of the lock, the recognition being achieved by photo sensitive means responding to the light reflecting quality of areas on the lock bolt mechanism, the lock drop arm and a combination wheel of the combination lock, the electronic circuit responding through a binary code to the condition of the photo sensitive means, and the indication including a visual display.
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Citations
7 Claims
- 1. A monitoring system for a combination lock which includes a first apertured, rotatable combination wheel, a withdrawable lock bolt mechanism, and a lock drop arm enterable within the aperture in said wheel to permit withdrawal of said bolt mechanism, said monitoring system comprising two optical sensors each incorporating an LED and a light sensing detector fixed with respect to the combination lock and focused on respective regions of the combination lock corresponding to a face of the rotatable combination wheel and a location occupied by a part of the lock bolt mechanism when withdrawn or otherwise by part of the lock drop arm when not entered within the aperture of said wheel, said face of the combination wheel having both light reflecting and non-reflecting areas and said parts of the lock bolt mechanism and said lock drop arm each having an area one of which areas is light reflecting and the other is non-reflecting, and electronic means responding to the combined response state of said optical sensors to provide an indication of the operated condition of the combination lock.
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6. A security device such as a safe or vault, provided with an access door, a combination lock on said door, and a monitoring system for said combination lock, said combination lock comprising a rotatable combination wheel, a withdrawable lock bolt mechanism, and a lock drop arm enterable into an aperture in said wheel to permit withdrawal of said lock bolt mechanism;
- and said monitoring system comprising a microswitch responsive to the open and closed conditions of said door, two optical sensors each of which includes an LED and a light sensing detector fixed with respect to the combination lock and focused on respective regions of the combination lock corresponding to a face of the rotatable combination wheel and a location occupied by a part of the lock bolt mechanism when withdrawn or otherwise by part of the lock drop arm when not entered within the aperture of said wheel, said face of the combination wheel having both light reflecting and non-reflecting areas and said parts of the lock bolt mechanism and said lock drop arm each having an area one of which areas is light reflecting and the other is non-reflecting, and electronic means responding to the combined response state of said optical sensors to provide an indication of the operated condition of the combination lock, and receiving power via contacts of said microswitch so that when said door is open said electronic means is deprived of power.
- View Dependent Claims (7)
Specification