Assist mechanism for lifting and closing large enclosures
US7290370B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 9, 2004 |
| Grant date | Nov 6, 2007 |
| Priority date | — |
| Expiry date | Sep 3, 2025 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05F1/1075
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An assist mechanism for assisting in the pivotal movement of an enclosure member between closed, intermediate, and open positions. A first biasing member has a swing arm pivotally connected to a strut and extends between a base plate and enclosure member, and a second biasing member has a link pivotally connected to a limited tension spring and also extends between the base plate and enclosure member, whereby each impart a substantially biasing force substantially on only one side of the intermediate position, with the first biasing member biasing the enclosure member away from the closed position, and a second biasing member biasing the enclosure member away from the open position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.