A pump made of plastic for dispensing products from containers

B - Operations – Transporting – 65 – D

Patent

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Details

B65D 47/34 (2006.01) B05B 11/00 (2006.01)

Patent

CA 2189997

An all plastic pump for liquids (1; 300) to be applied to a container, comprises a cylindrical chamber (13: 330) communicating with said container through a feeding hole (14; 240); at least one piston (12; 320) axially sliding within said cylindrical chamber (13; 330); retaining valvular means; at least one elastic bellows (40; 500; 800) and having its lateral surface (50; 600) in the shape of a spiral (80; 510) and incorporates a spring (63) made of plastic realized in a single piece with the bellows itself, the turns of which are arranged in correspondence with the contraction areas of the spiral (80; 510), suited to realize a protruding stiffening rib in respect of the external surface of the spiral.

Pompe (1; 300) pour liquides intégralement en plastique, à appliquer sur un récipient, comprenant une chambre cylindrique (13; 330) communiquant avec ledit récipient par un orifice de remplissage (14; 240); au moins un piston (12; 320) coulissant axialement à l'intérieur de ladite chambre cylindrique (13; 330); des moyens valvulaires de retenue; au moins un soufflet élastique (40; 500; 800). La surface latérale (50; 600) de ladite pompe a la forme d'une spirale (80; 510) et la pompe incorpore un ressort (63) en plastique réalisé d'un seul tenant avec le soufflet, ressort dont les spires sont disposées de manière à correspondre avec les zones de contraction de la spirale (80; 510), et qui est conçu pour constituer une nervure de renforcement saillante par rapport à la surface extérieure de la spirale.

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