Safety device, particularly for roll-up doors
US4953608A · kind A · utility
48Cited by
8References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 17, 1989 |
| Grant date | Sep 4, 1990 |
| Priority date | — |
| Expiry date | Mar 17, 2009 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06B2009/885
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A safety device, particularly intended to be used in roll-up doors to cause reversal of the door closing movements in case an obstacle obstructs the path of movement of the door. The device comprises at least a couple of photoelectric cells which are arranged at a certain distance from the closing edge of the door leaf in alignment with the door leaf on a support arm which is displaceable in the direction of closing of the door.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.