Patent US3673569A successfully refreshed from Google Patents.
US3673569A
Expired / Lapsed
US
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Multiplexer for controlling and monitoring coded key operated accesses
Assignee: Eaton Corp
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Filing: 1971-04-19
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Granted: 1972-06-27
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Expires: 1991-04-19
Abstract
Abstract A multiplexer for scannings a plurality of controlled accesses, or doors, for determining if access or entry has been attempted. The scanner is coupled to a multiplicity of such accesses for determining if a key has been placed in its receptacle for operating a controlled latch. The key is preferably an electrical key having unlocking and identification information recorded thereon. If a key-in condition is determined, the scanner is momentarily stopped to allow the information derived from the key to be processed for determining the validity of the unlocking information and the key user identification information. This I.D. control information is also recorded for providing a record of the key usage relative to the time of day, the door and the recorded control information. If the control information is completely valid as to the unlocking information and the identification information only, then is the controlled latch operated.
Inventors
- 👤 Robert A Hedin
- 👤 Everett E Dukes Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:18
CPC Classifications
G; G07; G07C; G07C9/00; G07C9/00174; G07C9/00896; G07C9/00904; G07C9/20; G07C9/27
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
291 words
A multiplexing system for monitoring and controlling the operation of a multiplicity of controlled accesses, said system comprising A plurality of controlled accesses, each access having a latch and key-operable control means for unlocking the latch and a key having preselected control actuation information recorded thereon unique for operating the control means for unlocking the latch and preselected identification information having unique identification control actuation information recorded thereon and means for indicating a key-in condition of the key relative to the control means for operating the latter, said key-operable control means being constructed and defined for unlocking the latch only in response to the placement of the key having the correct preselected control actuation information and the correct preselected key identification information in the control means, scanning means coupled to each of the controlled accesses for continuously scanning each access to sense the placement of a key in the control means and producing a key-in output indication representative of a particular access having a key placed therein in response to the sensing of the key-in condition, recording means coupled to be responsive to the keyin output indication of the scanning means for recording the key information in terms of the identification of the access and the key control information, and means for actuating said key operable control means to unlock said latch in response to said scanning means sensing the placement of a key in the control means and producing a key-in output indication, said means for actuating said key operable control means operating to actuate said control means for a preselected duration of time during which access is provided through the access associated with the actuated control means and said scanning means operates to continuously scan said plurality of accesses.
Claim 2
Dependent Claim
291 words
A multiplexing system for monitoring and controlling the operation of a multiplicity of controlled accesses, said system comprising A plurality of controlled accesses, each access having a latch and key-operable control means for unlocking the latch and a key having preselected control actuation information recorded thereon unique for operating the control means for unlocking the latch and preselected identification information having unique identification control actuation information recorded thereon and means for indicating a key-in condition of the key relative to the control means for operating the latter, said key-operable control means being constructed and defined for unlocking the latch only in response to the placement of the key having the correct preselected control actuation information and the correct preselected key identification information in the control means, scanning means coupled to each of the controlled accesses for continuously scanning each access to sense the placement of a key in the control means and producing a key-in output indication representative of a particular access having a key placed therein in response to the sensing of the key-in condition, recording means coupled to be responsive to the keyin output indication of the scanning means for recording the key information in terms of the identification of the access and the key control information, and means for actuating said key operable control means to unlock said latch in response to said scanning means sensing the placement of a key in the control means and producing a key-in output indication, said means for actuating said key operable control means operating to actuate said control means for a preselected duration of time during which access is provided through the access associated with the actuated control means and said scanning means operates to continuously scan said plurality of accesses.
Claim 3
Dependent Claim
52 words
A multiplexing system as defined in claim 1 wherein the scanning means includes scanning control means coupled to be responsive to the key-in condition indicating means for momentarily stopping the scanning means in response to the placement of the key in the key operable control means at each of the controlled accesses.
Claim 4
Dependent Claim
63 words
A multiplexing system as defined in claim 2 wherein said means for actuating said key-operable control means includes means for signalling that a key having valid control actuation has been placed therein for unlocking the latch and providing an output indication of a preselected duration for preventing the re-recording of the unlocked latch or key-in condition upon successive scans by the scanning means.
Claim 5
Dependent Claim
95 words
A multiplexing system as defined in claim 3 wherein the key-operable control means includes timing circuit means coupled to be responsive to the key-in condition indicating means and providing an output indication after a preselected time interval which is greater than said preselected duration of said output indication of said means for signaling that a key having valid control actuation has been placed in said control means that the key-in condition persists to prevent the re-recording of information at the corresponding access upon successive scans by the scanning means until the key-in condition is terminated.
Claim 6
Dependent Claim
78 words
A multiplexing system as defined in claim 4 wherein the scanning means comprises an electronic binary counter and a pulse source coupled to the counter for continuously counting up the counter and resetting it to allow it to continuously recycle through its count in response to the pulses from the pulse source and having a binary decoder coupled to receive the signals from the counter and providing a unique signal representative of a controlled access for each count.
Claim 7
Dependent Claim
290 words
A multiplexing system for monitoring the operation of a multiplicity of controlled accesses, said system comprising a plurality of controlled accesses, each access having a latch and an electrical key-operated latch control means for locking and unlocking the latch, said control means including circuit means for determining whether a key coupled to the control means is a valid key Or not for unlocking the latch and signalling the validity or invalidity of the key, a corresponding plurality of electrical keys each having unlocking information recorded thereon and derivable therefrom upon being coupled to the latch control means, an electronic scanner having a plurality of output indications, one for each controlled access, for continuously sensing the coupling of an electrical key to the latch control means at each of the controlled accesses and to momentarily interrupt its scanning in response to the sensed coupling of a key with the latch control means and to provide an output indication representative of said condition, recording means coupled to be responsive to the scanner and the latch control means for recording the coupled key unlocking information and determining as to whether or not the coupled key is valid or not for the controlled access, and means for actuating said latch control means to unlock said latch in response to said electronic scanner sensing the coupling of a key with the latch control means, said means for actuating said latch control means operating to actuate said control means for a predetermined length of time during which access is provided through the access associated with the actuated latch control means, said scanner operates to continuously scan said plurality of accesses and said recording means is inhibited from recording the coupled key unlocking information more than once.
Claim 8
Dependent Claim
290 words
A multiplexing system for monitoring the operation of a multiplicity of controlled accesses, said system comprising a plurality of controlled accesses, each access having a latch and an electrical key-operated latch control means for locking and unlocking the latch, said control means including circuit means for determining whether a key coupled to the control means is a valid key Or not for unlocking the latch and signalling the validity or invalidity of the key, a corresponding plurality of electrical keys each having unlocking information recorded thereon and derivable therefrom upon being coupled to the latch control means, an electronic scanner having a plurality of output indications, one for each controlled access, for continuously sensing the coupling of an electrical key to the latch control means at each of the controlled accesses and to momentarily interrupt its scanning in response to the sensed coupling of a key with the latch control means and to provide an output indication representative of said condition, recording means coupled to be responsive to the scanner and the latch control means for recording the coupled key unlocking information and determining as to whether or not the coupled key is valid or not for the controlled access, and means for actuating said latch control means to unlock said latch in response to said electronic scanner sensing the coupling of a key with the latch control means, said means for actuating said latch control means operating to actuate said control means for a predetermined length of time during which access is provided through the access associated with the actuated latch control means, said scanner operates to continuously scan said plurality of accesses and said recording means is inhibited from recording the coupled key unlocking information more than once.
Claim 9
Dependent Claim
55 words
A multiplexing system as defined in claim 6 wherein the recording means is a printer including means for rendering certain valid keys void and providing an output indication to said latch control means upon the coupling of one of said voided keys to the control means for rendering the key invalid for unlocking the latch.
Claim 10
Dependent Claim
46 words
A multiplexing system as defined in claim 7 wherein the electrical keys having unlocking information and identification information recorded thereon and the latch control means is defined for unlocking the latch only when a key coupled thereto has valid unlocking and valid identification information recorded thereon.
Claim 11
Dependent Claim
75 words
A multiplexing system as defined in claim 8 wherein said means for actuating said latch control means includes circuit means for signaling the coupling of a completely valid key to the control means to allow the unlocking of the latch and preventing the repetitious printing out of the key information during said predetermined length of time that said control means is actuated upon successive scans of the controlled accesses until the key is decoupled therefrom.
Claim 12
Dependent Claim
65 words
A multiplexing system as defined in claim 9 wherein said means for actuating said control means includes timing circuit means responsive to the coupling of a key to the latch control means for rendering the printer inoperative for the access having a key coupled thereto beyond a preselected time interval which is greater than the predetermined length of time that said control means is actuated.
Claim 13
Dependent Claim
38 words
A multiplexing system as defined in claim 7 wherein the printer provides an output printing signal and the electronic scanner includes control means responsive to the printing signal for causing the scanner to continue scanning in response thereto.
Claim 14
Dependent Claim
36 words
A multiplexing system as defined in claim 11 wherein the control means includes circuit means for sensing the printer malfunction and providing an output signal for causing the scanner to continue in operation in response thereto.
References Cited (Backward Citations)
US3590333A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |