Overhead door lift assembly and tensioner
US11982120B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Mar 22, 2021 |
| Grant date | May 14, 2024 |
| Priority date | — |
| Expiry date | Dec 25, 2042 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/516
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The overhead door lift assembly integrates a traditional torsion spring and an electrically powered operator into a small package mountable in the available head space of conventional tractor trailers, cargo vehicles or other structures. The lift assembly includes a torsion spring counterbalance, electrical operator, and back tension mechanism. The electrical operator uses an electromagnetic clutch and gearbox that couples directly to the cable drums of the counterbalance. The electromagnetic clutch allows the overhead door to be manually raised and lowered in the event of a power interruption or operator malfunction. The back tension mechanism prevents cables from inadvertently unspooling from cable drums as the operator starts to move the overhead door from its horizontal open position to its vertical closed position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.