Pushbutton for actuating a dispenser for semi-liquid substances
US5096098A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 31, 1990 |
| Grant date | Mar 17, 1992 |
| Priority date | — |
| Expiry date | Oct 31, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D47/248
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A problem which arises with dispensers for semi-liquid substances lies in there being an outlet channel which is permanently in communication with ambient air. After first use of the dispenser, the corresponding dead volume is filled with semi-liquid substance which quickly becomes spoiled; thereby making subsequent utilization at least difficult and possibly toxic or even impossible. The present invention avoids this difficulty by means of a pushbutton in which the outlet channel is defined by co-operation between a flexible part and a rigid part. The outlet channel extends essentially radially and its volume is reduced when the user applies axial pressure on the pushbutton. A motion transforming system for transforming axial displacement into radial displacement serves simultaneously to retract a plunger received in the outlet channel, thereby disengaging the delivery orifice of the pushbutton. Such a pushbutton is particularly advantageous when used in association with a metering pump type dispenser valve which can then be made without its own outlet valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.