Device for operating a closure element moving at least approximately vertically
US5803150A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 15, 1996 |
| Grant date | Sep 8, 1998 |
| Priority date | — |
| Expiry date | Oct 15, 2016 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06B9/72
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The operating device comprises a drive shaft (1) driven by a geared motor unit (4) via a transmission mechanism allowing the closure element being lowered to be disengaged when a resistive force opposes the lowering thereof. The device has no brake. By contrast, it comprises a spring (8) for compensating for the weight of the closure element and the transmission mechanism (6) consists of a friction coupling and, possibly, of a one-way coupling mechanism. The absence of a brake and the weight compensation make it possible for the closure element to be raised easily and quickly by hand in an emergency, while the friction coupling allows the closure element to be driven downward by the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.