Compressible pump chamber having predetermined collapsing...

B - Operations – Transporting – 05 – B

Patent

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B05B 11/00 (2006.01)

Patent

CA 2165315

A collapsible pump chamber, e.g., a bellows, for use with a liquid dispensing pump device is provided. The collapsible pump chamber incudes a collapsing side wall which defines an internal volumetric portion of the pump chamber. The collapsing side wall has a structure which collapses in a predetermined pattern as the pump device is actuated. For example, the predetermined pattern of collapse could result in an initially relatively small volumetric change in internal volume per given stroke length followed by an increased volumetric change in internal volume per given stroke length. Thus, the pump device would initially provide very good control over the amount of product is dispensed; giving precise control during a partial actuation. However, the same pump device would also be capable of delivering a large volume of product during a complete actuation.

L'invention concerne une chambre de pompe pouvant s'aplatir, par exemple en accordéon (40). La chambre de pompe pouvant s'aplatir comporte une paroi latérale pouvant s'aplatir qui délimite le volume interne de la chambre de pompe. La paroi latérale pouvant s'aplatir a une stucture qui s'aplatit suivant un schéma prédéterminé lorsque le dispositif de pompe est actionné. Par exemple, le schéma prédéterminé d'aplatissement peut produire un changement initial relativement faible du volume interne pour une longueur de course donnée, suivi par un changement accru du volume interne pour une longueur de course donnée. Dans ce cas, le dispositif de pompe assure initialement un très bon contrôle de la quantité de produit expulsé, ainsi qu'un dosage précis pour une course partielle. Toutefois, le même dispositif de pompe peut également fournir un grand volume de produit lorsque la course est complète.

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