Canister closure
US4316550A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 5, 1979 |
| Grant date | Feb 23, 1982 |
| Priority date | — |
| Expiry date | Jul 5, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D39/12
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A closure is provided for canisters, in particular canisters having a relatively large mouth or opening, and designed for keeping foodstuffs in the kitchen. The canister opening is defined by a sidewall, and the closure comprises a skirt that is radially expandable in a controlled manner for clamping inside of the sidewall, or releasing the sidewall, to seal or open the canister opening. For the controlled expansion or contraction of the skirt of the closure, the skirt is flexibly connected to a convex bottom. The bottom includes a conical, relatively rigid intermediate ring panel sloping downwardly toward the interior of the canister from the skirt, and a rigid central panel circumferentially hinged to the intermediate panel and axially movable in a controlled manner for varying the slope of the annular intermediate panel, thus varying the effective diameter of the skirt. A major advantage of the invention is that the closure is clamped in the canister opening by the closure bottom being clamped from more convex to less convex, whereby a subatmospheric pressure is generated in the interior of the canister, which is conducive to retaining the closure in the canister opening. The bo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.