Electric gear motor with epicycloidal reduction and automatic brake for supple shutters of the balanced type
US5447477A · kind A · utility
18Cited by
3References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 2, 1993 |
| Grant date | Sep 5, 1995 |
| Priority date | — |
| Expiry date | Nov 2, 2013 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2400/3013
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An electric gear motor with reduction gears and automatic brake for shutters, wherein an emergency control is provided to allow the shutter to be manually maneuvered in the event of motor brake down or loss of power. A toothed ring is normally retained in a non-rotatable position relative to the reduction gears under the influence of a yieldable leg of a spring pin. The yieldable leg is movable away from the ring to permit the ring to rotate with the reduction gears and free of a motor drive shaft in the event the motor fails to activate in a normal manner thus enabling the shutters to be manually operated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.