Trailer jack lock
US7584677B1 · kind B1 · utility
8Cited by
19References
6Claims
0Family size
Inventors
Key dates
| Filing date | Sep 21, 2006 |
| Grant date | Sep 8, 2009 |
| Priority date | — |
| Expiry date | Apr 8, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/18576
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A kit is described that modifies a standard screw jack for a trailer hitch, by introducing a safety lock mechanism. The modified screw jack will be inoperative until the safety lock mechanism is opened. In the inoperative position, the screw jack cannot be turned to lift or lower the trailer hitch. The crank for turning the screw jack will be freewheeling or frozen. Turning a key in a lock keyway will release the safety lock mechanism, thus putting the crank into rotational engagement with the screw jack.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.