Vacuum canister
US5564581A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 23, 1995 |
| Grant date | Oct 15, 1996 |
| Priority date | — |
| Expiry date | Aug 23, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D81/2038
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A vacuum canister comprises a container section and a cover with an integrally formed air suction device. The air suction device includes a sleeve pipe, an eduction membrane and a piston tube. One end of the sleeve pipe has an anchor plate and a grating plate. A flexible eduction membrane is located between the anchor plate and the grating plate, and fastened to the anchor plate. The anchor plate has a flow hole therethrough and the grating plate has an air hole therethrough. The membrane is movable between a first position in which the membrane allows airflow through the air hole and a second position in which the membrane blocks airflow through the air hole. The piston tube is received by, and moves within, the sleeve pipe. One end of the piston tube has a front retaining edge, a rear retaining edge, and a flexible O-ring movable therebetween. The front and rear retaining ends are separated by an interval of space. The O-ring has a thickness smaller than the interval of space. The piston tube also has a relief hole formed therethrough along a portion of the interval of space. The O-ring moves within the interval of space between a first position in which the O-ring blocks airflow…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.