Door operator unit
US6422965B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 2000 |
| Grant date | Jul 23, 2002 |
| Priority date | — |
| Expiry date | Apr 20, 2020 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06B2009/6818
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A door operator unit includes a drive motor connected to a speed reduction differential planetary gear drive mechanism having a drive unit output shaft for connection to a further door drive mechanism. An electromagnetic brake is interposed between the motor output shaft and the planetary gear drive mechanism and is releasable when energized to allow rotation of the motor output shaft and the drive unit output shaft. A first ring gear of the planetary gear drive mechanism is normally held stationary by a release block and is operable in response to disengagement of the release block to permit rotation of the drive unit output shaft when the brake in engaged to allow manual opening and closing of the door. A torque limiting clutch may be interposed the operator unit output shaft and a second ring gear of the differential planetary gear drive mechanism.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.