Non throttling discharge pump assembly
US4842495A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 23, 1987 |
| Grant date | Jun 27, 1989 |
| Priority date | — |
| Expiry date | Oct 23, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B11/1039
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A pump assembly (1) for an atomizing piston pump comprising a piston (16) slidably located in a cylinder (4), a variable volume fluid storage chamber (5) in communication with the cylinder on one side of the piston, means (18) for varying the volume of the chamber, resilient means (17) urging the varying means into a position corresponding to the minimum volume of the chamber, a fluid flow passageway (30, 31) through the piston, a resilient valve member (25) normally closing the passageway and deforming means (23) for deforming the valve member so as to open the passageway only after the piston has moved relative to the cylinder by a predetermined amount greater than zero. The pump assembly has application to dispensing metered doses of medicinal products and ensures that the dispensed dose is independent of finger pressure applied to the actuator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.