Electronic security control system
US3953769A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 29, 1974 |
| Grant date | Apr 27, 1976 |
| Priority date | — |
| Expiry date | Jul 29, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C9/00674
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Actuation of an electrically operated lock is controlled by an electronic permutation circuit including an array of code entry push-button switches disposed for operation at the entrance to a secured area and a plurality of code selector switches mounted inside the secured area for setting a predetermined code sequence. If the correct code sequence is entered, corresponding to the setting of the code selector switches, an electronic counter is sequentially advanced to a selected terminal state determined by a code length selector switch which is connected to and for operating the electrically controlled lock. The time interval during which the lock is electrically actuated may be selected by a latch time selector switch mounted along with the code selector switches inside the secured area. The occurence of a preselected number of errors during code entry, a number which may be set by a selector switch mounted along with the other selector switches, provides for activating a penalty period during which the entire system is disabled and inoperable. The duration of the penalty time may also be varied by another selector switch. A common counting circuit is employed for the error count…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.