Patent US4591852A successfully refreshed from Google Patents.
US4591852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording lock system
Assignee: Individual
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Filing: 1984-04-30
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Granted: 1986-05-27
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Expires: 2004-04-30
Abstract
Abstract An automatic system for identifying an authorized key utilized to lock and unlock a door lock and to record pertinent data attendant thereto is disclosed herein having a key sensing mechanism incorporated into a lock that operates a switch circuit to generate a key identification signal. A control circuit receives the signal as well as time and date information and introduces this data to a printer for producing a visual record of the door lock transaction. The authorized key is coded not only to lock and unlock the door lock but includes a plurality of identification number codes along a given length.
Inventors
- 👤 Meyer C. Brod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:49
CPC Classifications
G; G07; G07C; G07C1/00; G07C1/32; E; E05; E05B; E05B49/00; E05B49/002; E05B49/004; Y; Y10; Y10T; Y10T70/00; Y10T70/70; Y10T70/7441; Y10T70/7486; Y10T70/7508; Y10T70/7559; Y10T70/7588; Y10T70/7593; Y10T70/7599; Y10T70/7605; Y10T70/80; Y10T70/8027; Y10T70/8054
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
327 words
An automatic system for identifying an authorized key utilized to lock and unlock a bolted door lock and to record pertinent data attendant thereto on a printed sheet, the combination which comprises: an authorized key of a given weight having coded notches along an edge; a door lock; a key sensing mechanism carried on said door lock responsive to said authorized key coded notches for actuating said door lock; a switch circuit operable in response to said key sensing mechanism and said door lock actuation to generate key transaction signals; said door lock and said switch circuit operating simultaneously in response to said key sensing mechanism; control circuit means coupled to said switch circuit for receiving said key transaction signals and for producing time and date signals associated with said key transaction signals; printer means operatively connected to said control circuit for receiving said key transaction signals and said time and date signals for recording onto said printed sheet; said key sensing mechanism includes a body having a concentric inner cylinder with a plurality of coaxial cylindrical sleeves arranged adjacent to one another about said inner cylinder; pin means resiliently mounted to move between said body, said sleeves and said inner cylinder for selectively connecting certain ones of said sleeves to said inner cylinder and certain ones of said sleeves to said body in response to a particular one of said authorized keys whereby said certain ones of said sleeves connected to said inner cylinder rotate and said sleeves connected to said body remain stationary; said key sensing mechanism further includes fixed electrical contacts on said body matable with movable electrical contacts on said inner cylinder for generating lock and unlock signals to said printer via said control circuit; and each of said key sensing mechanism sleeves includes a recess occupied by a resiliently biased contact movable in response to movement of connected ones of said sleeve with said inner cylinder to initiate said key transaction signals.
Claim 2
Dependent Claim
327 words
An automatic system for identifying an authorized key utilized to lock and unlock a bolted door lock and to record pertinent data attendant thereto on a printed sheet, the combination which comprises: an authorized key of a given weight having coded notches along an edge; a door lock; a key sensing mechanism carried on said door lock responsive to said authorized key coded notches for actuating said door lock; a switch circuit operable in response to said key sensing mechanism and said door lock actuation to generate key transaction signals; said door lock and said switch circuit operating simultaneously in response to said key sensing mechanism; control circuit means coupled to said switch circuit for receiving said key transaction signals and for producing time and date signals associated with said key transaction signals; printer means operatively connected to said control circuit for receiving said key transaction signals and said time and date signals for recording onto said printed sheet; said key sensing mechanism includes a body having a concentric inner cylinder with a plurality of coaxial cylindrical sleeves arranged adjacent to one another about said inner cylinder; pin means resiliently mounted to move between said body, said sleeves and said inner cylinder for selectively connecting certain ones of said sleeves to said inner cylinder and certain ones of said sleeves to said body in response to a particular one of said authorized keys whereby said certain ones of said sleeves connected to said inner cylinder rotate and said sleeves connected to said body remain stationary; said key sensing mechanism further includes fixed electrical contacts on said body matable with movable electrical contacts on said inner cylinder for generating lock and unlock signals to said printer via said control circuit; and each of said key sensing mechanism sleeves includes a recess occupied by a resiliently biased contact movable in response to movement of connected ones of said sleeve with said inner cylinder to initiate said key transaction signals.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-26 | 1989-11-25 | 1990-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-26 | 1993-11-25 | 1994-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-26 | 1997-11-25 | 1998-05-27 | $7700.00 | Window Closed / Lapsed |