Multi-speed drop leg mechanical jack for use with a trailer
US6893006B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 18, 2003 |
| Grant date | May 17, 2005 |
| Priority date | — |
| Expiry date | Feb 18, 2023 |
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 crank provides an efficient way to change from one operating gear of the jack to another, and facilitates operator use of the mechanical jack to which it is connected, in order to provide improved cranking and improved changing of one operating gear to another. The invention facilitates multiple working speeds and a drop leg speed to create a commercially valuable selection of working gear ratios and mechanical jack load capacities in a trailer (e.g., gooseneck, flatbed, etc.) operating environment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.