Trailer jack using full sized spare tire
US4799648A · kind A · utility
Inventors
Key dates
| Filing date | Dec 8, 1986 |
| Grant date | Jan 24, 1989 |
| Priority date | — |
| Expiry date | Dec 8, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60D1/66
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An improved trailer jack has a castor structure enabling use of a full size spare trailer wheel and tire on the jack; the jack has a gear box mechanism, a lift post drivable up and down by the gearbox, and a lift element pivotally journaled inside the post; the lift element has an offset structure which raises the spare axle axis up to a level above the bottom of the post and the axle is spaced to one side so that when the full size spare wheel and tire is used, it pulls up into a locked storage position above and alongside on the trailer tongue, when the spare is down, it swivels completely around under the tongue and around the lift post. The trailer is much easier to manually manipulate in a garage or driveway. An improved lift assembly with a unique swiveling lift member having both a trailing offset and transverse offset is utilized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.