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Apparatus for evacuating a rigid container using a two-stroke reciprocating-piston pump having an air evacuating vacuum cup which is to be applied to the container lid. The pump cylinder houses a reciprocating piston-check-valve. An adhesive-tape check valve is applied to a container access opening

Apparatus for evacuating a rigid container using a two-stroke reciprocating-piston pump having an air evacuating vacuum cup which is to be applied to the container lid. The pump cylinder houses a reciprocating piston-check-valve. An adhesive-tape check valve is applied to a container access opening in the lid; and the vacuum cup is seated over the adhesive-tape check valve to evacuate the rigid container. An alternative embodiment employing a vacuum probe having an in-line check valve is inserted into an otherwise plugged opening in the pump cylinder wall to evacuate a deformable container. In the second embodiment, the adhesive-type check valve is eliminated. The two check valves employed in each embodiment alternate open and closed states during piston reciprocation.

대표청구항 ▼

Apparatus for evacuating a container comprising a two-stroke reciprocating-piston pump having a flexible, air-evacuating vacuum cup which is to be applied to an access opening to the container, a piston-check-valve for the pump having a piston body and a check-valve supported by the piston body, a f

Apparatus for evacuating a container comprising a two-stroke reciprocating-piston pump having a flexible, air-evacuating vacuum cup which is to be applied to an access opening to the container, a piston-check-valve for the pump having a piston body and a check-valve supported by the piston body, a flexible valve to be applied to the access opening so as to cover the access opening with one of the check valves being open and the other closed during a first stroke of the piston when the vacuum cup is seated on the container in communication with the flexible check valve, and with both check valves alternating open-closed states during the second stroke of the piston to thereby evacuate the container, and means restraining the vacuum cup from collapsing upon the flexible check valve which collapse would cause the flexible check valve to close the access opening during both strokes of the piston thereby preventing substantial evacuation of the container.