Multi-speed drop leg mechanical jack for use with a trailer
US7325786B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 21, 2004 |
| Grant date | Feb 5, 2008 |
| Priority date | — |
| Expiry date | Oct 20, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60S9/08
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A mechanical jack that is used with trailers that has a functional combination of several working gears as well as a drop leg feature is disclosed. The mechanical jack has a gearbox having gears that not only have the capacity to handle a relatively heavy load, but also have the ability to handle small and midsize loads while maintaining sufficient and commercially acceptable cranking speeds without excessive force required. The jack includes a crank or handle for use with the mechanical jack that assists in both effective raising and lowering of the jack, as well as efficient transition from one working gear to another. The jack may also utilize an electric motor as the source of input power to the jack.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.