Combination lock with motor-driven tumblers
US5184491A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 19, 1990 |
| Grant date | Feb 9, 1993 |
| Priority date | — |
| Expiry date | Jul 19, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/8405
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A combination lock wherein the tumblers can be moved to predetermined positions, preparatory to retraction of the locking bolt from extended position, by an electric motor which is controlled by a microprocessor. The microprocessor receives signals from a keyboard or from a disc and can start the motor for the purpose of aligning the normally scrambled tumblers only in response to reception of a predetermined sequence of signals. A manually operated knob can be coupled to a driver for the tumblers in order to change the positions of the tumblers and/or to move the locking bolt between extended and retracted positions independently of the motor. The microprocessor is programmed to start the motor only in response to reception of a predetermined sequence of signals in accordance with a selected combination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.