Pump dispenser for fluent products featuring a reciprocable plunger and diaphragm seal
US4671432A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 21, 1985 |
| Grant date | Jun 9, 1987 |
| Priority date | — |
| Expiry date | Oct 21, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB67D7/0205
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A pump dispenser for fluent products is disclosed as inluding a container for housing the fluent product, dispensing outlet means on the container, a follower piston closing the lower end of the container below the product, and means for varying the volume within such dispenser. The volume varying means comprises a plunger adapted to be reciprocated within the dispenser to alternately decrease the volume therewithin and, following such decrease, return to its original position thereby increasing the volume within the dispenser. The plunger further comprises a peripheral skirt having predetermined outer lateral dimensions at its lower distal end, and an enlarged attachment head on such lower distal end. The attachment head has predetermined outer lateral dimensions which are larger than the outer lateral dimensions of such lower distal end therey effectively forming a reentrant portion on the plunger above the enlarged head. A flexible thin-walled diaphragm adapted to isolate and seal the volume reducing means from the fluent product is connected about its outer periphery to the dispenser. The diaphragm further has a central portion substantially conforming to the enlarged attachmen…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.