Air-hydraulic pump with auxiliary pumping means
US5013198A · kind A · utility
Inventor
Key dates
| Filing date | Nov 30, 1988 |
| Grant date | May 7, 1991 |
| Priority date | — |
| Expiry date | Nov 30, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/7725
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An air-hydraulic pump incorporates a primary pumping mechanism for supplying a first level of fluid pressure to a work-performing tool at a first flow rate in response to a supply of pressurized air. An auxiliary pumping mechanism is provided for delivering a second level of hydraulic fluid pressure less than the first level at a flow rate greater than the first flow rate. The auxiliary pumping mechanism provides sufficient pressure to overcome a load on the system up to a predetermined level, after which the auxiliary pumping mechanism ceases operation due to such load and the primary pumping mechanism delivers fluid pressure to the system sufficient to overcome the load. The auxiliary pumping mechanism speeds up operation of the work-performing tool for providing time-saving operation thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.