Light beam detector for door openers using fiber optics
US5233185A · kind A · utility
54Cited by
14References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 28, 1992 |
| Grant date | Aug 3, 1993 |
| Priority date | — |
| Expiry date | Feb 28, 2012 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2600/46
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A light beam transmitter and receiver are located in or near a door opener enclosure, and fiber optics connect the transmitter and receiver to the sides of the door opening. Lens arrangements are attached to the ends of the optic cables and are mounted near the bottom of the door frame. Thus, the transmitter and receiver do not need to be located near the door which eliminates the need for wiring from the enclosure to the door area and protects the transmitter and detector from physical abuse at the doorway.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.