Vacuum canister
View Patent ↗A vacuum canister includes a storage space and a removable lid. The lid includes a pump housing that defines a pumping chamber within which a sliding piston is disposed. The piston is connected to a handle via a piston rod and features a skirt-like piston valve that seals against the side wall of the pump housing when the piston travels downward but permits air to pass when the piston travels upward. Air is pumped from the canister storage space via the pump. A vacuum indicator and release valve are also positioned in the lid. A bellows communicates with the canister storage space and contracts when a vacuum is present. The bellows is connected to a lever which pivots to extend a button indicating the presence of the vacuum. Pushing the button causes the lever to engage a vacuum release valve.
1. A vacuum canister for storing perishable items comprising:
a) a body having an open top and defining a storage space;
b) a lid removably covering the open top of the body;
c) a pump housing positioned within said lid and defining a pumping chamber that selectively communicates with the atmosphere and the storage space;
d) a piston slidably positioned within the pumping chamber;
e) a pump handle;
f) a piston rod connecting the pump handle to the piston so that said piston may be actuated via the pump handle; and
g) a skirt-like piston valve formed of flexible material and extending downwardly and generally radially-outward from a periphery of the piston and sealing against the pump housing so that air is expelled from the pumping chamber to the atmosphere when the piston is moved in a first direction, said skirt valve also permitting air to pass between the periphery of the piston and the pump housing so that air is transferred from the storage space to the pumping chamber when the piston is moved in a second direction.
2. The vacuum canister of claim 1 wherein the pump housing communicates with the storage space via an intake passage and the atmosphere via an exhaust passage.
3. The vacuum canister of claim 2 wherein a filter is positioned within the intake passage.
4. The vacuum canister of claim 2 wherein a check valve is positioned within the intake passage.
5. The vacuum canister of claim 2 wherein the exhaust passage communicates with the atmosphere via a gap between the pump handle and the lid.
6. The vacuum canister of claim 1 further comprising a compression spring positioned between the piston and the pump housing.
7. The vacuum canister of claim 1 wherein the lid includes a top shell and a bottom shell with the pump housing positioned there between.
8. The vacuum canister of claim 1 wherein the first direction of the piston is downwards.
9. The vacuum canister of claim 1 further comprising a gasket between the lid and the body.