Pump closure for carbonated beverage container
US4723670A · kind A · utility
Inventors
Key dates
| Filing date | Nov 12, 1986 |
| Grant date | Feb 9, 1988 |
| Priority date | — |
| Expiry date | Nov 12, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65B31/047
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A hand-operated pump is combined with a closure cap for sealing and pressurizing the open space within a carbonated beverage container. A pump cylinder is integrally formed with a closure screw cap and is insertable through the neck of the beverage container. A piston is coupled by a retainer ring for extension and retraction through the pump cylinder. The piston carries a floating seal which is axially movable along a reduced diameter portion of the piston for opening and closing an air inlet port between an air supply annulus and a compression chamber. The pump includes an improved check valve assembly in which a compressed air discharge port is sealed by a resilient membrane which engages a tapered sealing surface which is coincident with the compressed air discharge port.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.