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AssigneeVacu Vin Innovations Ltd.
InventorsBart Lambertus Theodorus Johannes Van De Braak, Patrick Lambertus Kerkhof, Eelco Jan Gerardus Witteveen
Estimating the term…
Pump for applying an increased or reduced pressure to a container. The pump is provided with a plate-like part which reacts to the pressure difference between the container and the environment. This part can preferably adopt two stable positions, and a change is signalled. This change can be brought about, for example, by the sound generated as a result of the plate-like part turning over. The pitch and the like of the sound can be influenced by arranging the plate-like part in a hollow piston and providing the latter with openings leading to the environment.
Pump (1) comprising a piston/cylinder assembly (4, 5) which forms part of or is to be fitted to a container (3), the pressure in said container having to be increased or reduced with respect to the environment by actuation of said piston (5), characterized in that the said piston/cylinder assembly is provided with a plate-like part which can adopt at least two positions as a function of the pressure difference between container and environment, a first position where there is little or no pressure difference and a second position, which is displaced with respect to the first position, when the pressure has been increased or reduced, indicator means being present to provide an indication of a displacement from the first position to the second position or vice versa.
Pump according to one of the preceding claims, in which the said indicator means comprise colour indicator means.
Pump according to one of the preceding claims, in which the said plate-like part (8) includes a stable position.
Pump according to one of the preceding claims, in which the said plate-like part is arranged in the piston.
Pump according to one of the preceding claims, in which the said piston/cylinder assembly is provided with sound-tuning means (9).
Pump according to one of the preceding claims, in which the said plate-like part is provided with adjustment means.
Pump according to one of the preceding claims, in which the said plate-like part comprises a part which is produced by injection moulding.
Dependencies are inferred from the claim text.