Safety auxiliary apparatus for automatic door assembly
US5996281A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 28, 1997 |
| Grant date | Dec 7, 1999 |
| Priority date | — |
| Expiry date | Oct 28, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05F2015/435
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A safety auxiliary apparatus for an automatic door assembly includes a single door or first and second doors slidable along a predetermined track for selectively opening and closing the doorway, first and second mutually confronting closure faces being defined by said first and second doors or said single door in cooperation with a brace. A casing accommodating therein a light emitting element for emitting a beam for detection of an object and a light receiving element for receiving the beam from the light emitting element is mounted in a longitudinal frame member of the doors or said brace that define respectively said closure faces, so that an optical path can be defined between said closure faces so as to extend from the light emitting element to the light receiving element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.