Magnetic encoder for powered window covering
US6924615B2 · kind B2 · utility
8Cited by
14References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 31, 2003 |
| Grant date | Aug 2, 2005 |
| Priority date | — |
| Expiry date | Oct 31, 2023 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06B2009/6872
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A motor for turning the rod of an object such as a window covering is attached to an elongated ferromagnetic bar. Magnets are closely spaced from the bar, and as the bar rotates to cut the magnetic field lines, pickup coils generate signals that can be used to determine the direction and speed of rotation and also the position of the motor (and, hence, the position of the object being moved). The magnets brake the motor from turning under the weight of the object when the motor is deenergized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.