Hydraulic pump
US5207726A · kind A · utility
Inventor
Key dates
| Filing date | Aug 6, 1991 |
| Grant date | May 4, 1993 |
| Priority date | — |
| Expiry date | Aug 6, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B9/115
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An improved control mechanism for submerged reciprocating hydraulic pumps comprising, in combination with pump cylinders, pistons and valves, a two-stage flow reversing mechanism in which action of the pump pistons drives a valve pilot means between two rest positions; relocation of the pilot means in turn causes relocation of a spatially separated spool mechanism between two rest positions, thereby causing reversal of flow of fluid while the pump is driven by a one-way pressurizing pump. The two-stage reversing mechanism eliminates the possibility of having the reciprocating mechanism come to rest in a "dead center" or equilibrium position. The spool is mounted concentrically with the pump shaft, optimizing flow potential. The mechanism is relatively easy to assemble and repair.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.