Fiber optic escalator handrail intrusion detector shield
US5245315A · kind A · utility
10Cited by
10References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1992 |
| Grant date | Sep 14, 1993 |
| Priority date | — |
| Expiry date | Sep 8, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B29/04
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An optical fiber (28) disposed at the entry edge (32) of an escalator handrail guard (22) receives light from an LED (38), the magnitude of which is sensed by a detector (40), the output of which is compared (48) to determine whether its magnitude is sufficient to indicate the lack of intrusion of objects into the guard (22); if not a relay (56, 58) will drop power to the motor (62).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.