Automatic door sensor
US6782660B2 · kind B2 · utility
28Cited by
5References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 26, 2002 |
| Grant date | Aug 31, 2004 |
| Priority date | — |
| Expiry date | Jul 9, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/132
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Auxiliary sensors 51 and 52 are disposed on exterior and interior side surfaces 31 and 32 of a transom 3. The sensors 51 and 52 have detection areas A1, A2, B1 and B2 which extend through the doorway 2 and which cross each other in a space vertically above a track 10. While detection signals are produced by both auxiliary sensors 51 and 52, the door is kept open. If detection signals are produced from only one of the auxiliary sensors 51 and 52 uninterruptedly for a predetermined time, the door closing action is allowed to start.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.