Control system for hydraulic pump system
US5398506A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 22, 1994 |
| Grant date | Mar 21, 1995 |
| Priority date | — |
| Expiry date | Apr 22, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B49/24
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Electrically operated hydraulic pump systems are commonly used on tailgate loaders and small dump truck hoists. The systems include a switch which, when closed, couples the vehicle battery to the pump driving motor and a hydraulic lowering valve which, when opened, drains the output port of the pump to a reservoir. The control system for this electric pump system comprises an air cylinder operatively connected to the switch and a second cylinder operatively connected to the hydraulic lowering valve. A switching valve is connected between each air cylinder and a source of air pressure. The switching valves may be operated by an operator to pump or drain hydraulic fluid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.