Lock combination decoder
US4905490A · kind A · utility
7Cited by
8References
9Claims
0Family size
Inventor
Key dates
| Filing date | Aug 25, 1988 |
| Grant date | Mar 6, 1990 |
| Priority date | — |
| Expiry date | Aug 25, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/8405
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Apparatus for determining the opening combination of a safe lock includes a servo motor, a molded dial gripper that fits over the hub of the combination lock dial, and a high resolution rotary, encoder, preferably one with a resolution of 1000 PPR. The rotary encoder has a resolution of 0.09 degrees of rotation using quadrature, which permits the dial to be rotated accurately to within 1/10 of a digit. A programmable logic and control circuit can rotate the dial for automatic implementation of a manipulation technique. This permits the safe combination to be found in a rather short period of time, typically less than one hour.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.