Hydraulic release system for lifting jack
US4334667A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 7, 1980 |
| Grant date | Jun 15, 1982 |
| Priority date | — |
| Expiry date | Jul 7, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66F5/04
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A low-slung carriage-mounted lifting jack has a long tubular handle for projecting the jack beneath a conventional automotive vehicle. The handle is tiltably mounted on the carriage and simultaneously serves as a pump handle for pumping hydraulic fluid from a reservoir to a ram which in turn is operatively attached to an elevating linkage for lifting the vehicle. A pump, for operation of which the handle is tiltably mounted on the carriage, delivers hydraulic fluid under pressure from the reservoir to the ram. To release hydraulic pressure in the ram, for lowering the linkage and returning the fluid to the reservoir, there is a release valve with a release pin projecting adjacent the end of the handle which is tiltably mounted on the carriage. Within the handle is a rotatably mounted rod extending throughout the length of the handle, and on the end of the rod is a cam in operating engagement with the release pin. The cam moves the release pin to release, or lowering, position from which it is returned by hydraulic pressure when the cam action is discontinued.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.