Pump device with collapsible pump chamber having supply container venting system and integral shipping seal
US5664703A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 1995 |
| Grant date | Sep 9, 1997 |
| Priority date | — |
| Expiry date | May 15, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B11/0039
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A liquid dispensing pump is provided with a supply container venting system and a shipping seal. The pump device includes an upper and lower housing which are axially movable relative to each other between open and closed shipping seal positions. The dispensing pump includes a collapsible pump chamber with at least one shipping seal functional element integral with the chamber. The pump includes actuation elements which cooperate to prevent pump actuation when the shipping seal is closed. The pump may also include a tamper evident device to prevent pump actuation prior to tamper evident tab removal. The chamber may also include an integral valve which has the valve member biased against the valve seat. A supply container venting system for the pump comprises a resilient annular flange angled downward from the bellows at the liquid entry end. The annular flange presses against an interior surface of the lower housing to seal a supply container vent opening against communication with ambient air and moisture. The annular flange remains in contact with the interior surface until either a vacuum generated in the supply container by pumping fluid therefrom deflects the flange away from …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.