Powered controlled acceleration suspension work platform hoist system
US7631730B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 2005 |
| Grant date | Dec 15, 2009 |
| Priority date | — |
| Expiry date | Jun 17, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66D1/7489
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A powered controlled acceleration suspension work platform hoist system for raising and lowering a work platform at a predetermined acceleration. The system incorporates several hoists attached to the work platform and in electrical communication with the motor control system. The motor control system is attached to the work platform and is in electrical communication with a constant frequency input power source and the hoist motors. The motor control system controls the acceleration of the work platform as it is raised and lowered by controlling the hoist motors. The controlled acceleration hoist system also includes a platform control system attached to the work platform that is in electrical communication with the motor control system and the hoist motors. Acceleration control is achieved by converting the constant frequency input power to a variable frequency power supply. This may be accomplished through the use of a variable frequency drive(s).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.