Dispensing pump
US3987938A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 1975 |
| Grant date | Oct 26, 1976 |
| Priority date | — |
| Expiry date | Sep 18, 1995 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B53/1092
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A dispensing pump for application to a product container includes an elongated housing having a recess in a sidewall thereof and a flexible bulbous diaphragm seated over the recess for a trigger-type actuation as the housing is gripped in the manner of a handle. A variable volume pump chamber is defined by the diaphragm together with the recess, and an inlet passage is provided in the housing through which the product passes from the container into the recess. The diaphragm has an annular inner skirt for closing the inlet passage in response to axial deformation of the diaphragm, as well as intermediate and outer annular skirts. The intermediate skirt has a lower free edge portion normally covering a discharge port in the housing which communicates with the pump housing, and the outer skirt has a lower free edge portion normally covering a vent port in the housing which communicates with the atmosphere. The lower edge portions of the intermediate and outer skirts are of resilient flexible materials so as to respectively uncover the discharge and vent ports in response to a given fluid pressure therewithin. Accordingly, the inlet passage is closed upon depression of the diaphragm an…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.