Sign suspension system
US6701650B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 3, 1996 |
| Grant date | Mar 9, 2004 |
| Priority date | — |
| Expiry date | Jun 3, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F2007/186
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A remote-controlled motor-driven drum is provided to wind and unwind a cord which holds a self-balancing sign carrier. The sign carrier, which has telescoping rails, is adjustable in width. Its center rail includes two sheaves to receive the cord and lead it from the drum back to an end secured to the ceiling. Rotation of the drum raises and lowers the sign carrier and a sign carried by it. The sheaves on the carrier also serve to make the unit self-balancing. The motor responds to actuating signals for raising and lowering the sign and to safety features. Safety features include a limit switch which stops the motor when an object gets in the way, an overload control which stops the motor if excessive weight is detected, and the use of the motor for braking.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.