US3797936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic locking system
Assignee: Computerized Security Systems Inc
•
Filing: 1972-07-13
•
Granted: 1974-03-19
•
Expires: 1992-07-13
Abstract
Abstract An opto-electronic locking system for an entry door which is provided with an optically encoded key. The key is decoded internally by a sensing device which translates the light code detected into electrical levels which are compared with a stored code. If the code on the key corresponds to the stored code, then the circuit activates an electromechanical mechanism which in turn opens the lock. If the code on the key is not correct, then the electrical circuit activates an alarm or a security system or both.
Inventors
- 👤 A Dimitriadis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:30
CPC Classifications
E; E05; E05B; E05B49/00; E05B49/002; E05B49/006; Y; Y10; Y10S; Y10S70/00; Y10S70/51; Y10T; Y10T70/00; Y10T70/70; Y10T70/7051; Y10T70/7062
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
192 words
An opto-electronic locking arrangement for a closure having a locking bolt comprising an optically encoded key, an identically optically encoded element in said closure and hidden from view, at least one light source for irradiating said key and said element whereby a matrix code is formed having predetermined light levels, a separate light sensor for said key and said element whereby said light levels obtained therefrom are converted to electrical signals, a linearly movable separator positioned between said key and said element whereby when said key is inserted in said closure and moved past one light sensor said separator is engaged and moved which in turn moves said element in a linear direction past the other light sensor, a comparator device for comaring the output of the electric signals from said key to the output of said electric signals from said element, a locking solenoid for said locking bolt, an electronic circuit connecting said comparator device with said locking solenoid including an AND gate whereby when the electric signals derived from said key and said element at said AND gate are identical said locking solenoid is activated to unlock said locking bolt.
Claim 2
Dependent Claim
192 words
An opto-electronic locking arrangement for a closure having a locking bolt comprising an optically encoded key, an identically optically encoded element in said closure and hidden from view, at least one light source for irradiating said key and said element whereby a matrix code is formed having predetermined light levels, a separate light sensor for said key and said element whereby said light levels obtained therefrom are converted to electrical signals, a linearly movable separator positioned between said key and said element whereby when said key is inserted in said closure and moved past one light sensor said separator is engaged and moved which in turn moves said element in a linear direction past the other light sensor, a comparator device for comaring the output of the electric signals from said key to the output of said electric signals from said element, a locking solenoid for said locking bolt, an electronic circuit connecting said comparator device with said locking solenoid including an AND gate whereby when the electric signals derived from said key and said element at said AND gate are identical said locking solenoid is activated to unlock said locking bolt.
Claim 3
Dependent Claim
42 words
An opto-electronic locking arrangement as claimed in claim 1 wherein each of said light sensors is provided with a column of light detectors corresponding in numbers to the number of rows in said matrix code on both said key and said element.
Claim 4
Dependent Claim
54 words
An opto-electronic locking arrangement as claimed in claim 1 further comprising a flip flop device in said electronic circuit which receives the output of said comparator device, a micro switch for setting said flip flop device at a logical true, and the output of said flip flop device being fed into said AND gate.
Claim 5
Dependent Claim
21 words
An opto-electronic locking arrangement for a closure as claimed in claim 1 wherein the movement of said light sensors co-acts simultaneously.
Claim 6
Dependent Claim
23 words
An opto-electronic locking arrangement for a closure as claimed in claim 1 wherein said light sensors detect said matrix code in sequential columns.
Claim 7
Dependent Claim
67 words
An opto-electronic locking arrangement for a closure as claimed in Claim 1 wherein the logical expression of the output of the AND Circuit is (at . bt . ct . dt) (af . bf . cf . df) A where at, bt, ct, dt are derived from logical true areas of the key and af, bf, cf, df are derived from logical false areas of the key
Claim 8
Dependent Claim
31 words
An opto-electronic locking arrangement for a closure as claimed in claim 1 wherein said optically encoded key is provided with an optical filter coating to prevent visual readout of the code.
Claim 9
Dependent Claim
31 words
An opto-electronic locking arrangement for a closure as claimed in claim 1 further provided with means for activating said light source only when said key is inserted in said locking arrangement.
Claim 10
Dependent Claim
52 words
An opto-electronic locking arrangement for a closure as claimed in claim 3 further provided with a first means which clears the flip flop device if the light source is not operative, and a second means which clears the flip flop device if certain electrical noise is picked up by the locking arrangement.
References Cited (Backward Citations)
US2936607A
Cited
US3029345A
Cited
US3201961A
Cited
US3566085A
Cited
US3612888A
Cited
US3639906A
Cited
US3619060A
Cited
US3645626A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |