Blind pore piston pump with internal valve and stroke limiting spring winding
US5897303A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 22, 1996 |
| Grant date | Apr 27, 1999 |
| Priority date | — |
| Expiry date | Nov 22, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T8/4031
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The invention relates to a piston pump, having a piston that has a longitudinal bore, that includes a valve seat face upon which a valve closing body is pressed by a valve spring. The valve spring is a helical compression spring, whose winding diameter increases from a winding end that engages the valve closing body to a winding end that rests on a spring seat face formed in the longitudinal bore of the piston. The piston pump of the invention has the advantage that the valve closing body along with the valve spring can be installed in the piston in an axial motion; the valve spring is directly accessible, and a correct seating of the valve and valve spring in the longitudinal bore can be checked visually after installation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.