Controller for shutting apparatus
US6646399B2 · kind B2 · utility
9Cited by
16References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 30, 2000 |
| Grant date | Nov 11, 2003 |
| Priority date | — |
| Expiry date | Nov 30, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/45015
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A controller for a shutter moved between an opened position and a closed position. A plurality of location ranges is defined between the opened position and the closed position. The controller detects the current moving speed of the shutter in each range, compares the moving speed with a predetermined reference speed, and generates a stop signal based on the comparison result to stop the movement of the drive mechanism.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.