Self-closing apparatus
US5857595A · kind A · utility
Inventor
Key dates
| Filing date | Mar 21, 1996 |
| Grant date | Jan 12, 1999 |
| Priority date | — |
| Expiry date | Mar 21, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D47/2081
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
This invention relates to a self-closing apparatus which enables flowable substance present in a container to be dispensed therefrom. The apparatus includes a flexible diaphragm having an outlet aperture, and a stud which is fixed in relation to the diaphragm and which is located inwardly thereof, wherein the stud so coacts with the outlet aperture that the diaphragm in its normal position will rest with its outlet aperture resiliently in abutment with the stud and therewith close the container, and so that upon application of a pressure difference across the diaphragm to dispense substance from the container, the diaphragm will resiliently move away from the stud and therewith expose the outlet aperture. The diaphragm includes at least two deformation zones which are spaced at different distances from the outlet aperture, wherein these deformation zones extend around the outlet aperture, and are disposed as concentric circles having a center in the outlet aperture, and have the form of folds which include weakenings in the diaphragm thickness, thereby enabling the remainder of the diaphragm to have an uneven thickness without detrimentally affecting the mutual coaction between stu…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.