초록 ▼

A dispenser pump comprises a pump chamber having a flexible wall for altering the volume of the chamber. The flexible wall is a polygonal pyramid, preferably five-sided, with facets interupted by respective cylindrical surface portions inclined to the facet so as to induce bending thereof when the w

A dispenser pump comprises a pump chamber having a flexible wall for altering the volume of the chamber. The flexible wall is a polygonal pyramid, preferably five-sided, with facets interupted by respective cylindrical surface portions inclined to the facet so as to induce bending thereof when the wall is flexed on actuation of the pump, thereby producing a force tending to restore the flexible wall to its rest condition. An inoperative condition of the pump may be achieved by relative rotation of two body parts of the pump about the axis of a slidable telescopic guide connection between the flexible wall and a relatively fixed body part, a discharge nozzle of the pump being out of register with an outlet port of the pump in the inoperative condition. The flexible wall, an essentially rigid boundary portion thereof, an essentially rigid guide member that moves with it and the discharge nozzle may be formed together as a one-piece integral part of e.g. polypropylene.

대표청구항 ▼

A dispenser pump for dispensing material, the pump having: (a) first and second body parts, one of the body parts comprising a flexible wall and an essentially rigid boundary portion thereof; (b) a pump chamber between the body parts, the flexible wall at least partly defining the pump chamber; (c)

A dispenser pump for dispensing material, the pump having: (a) first and second body parts, one of the body parts comprising a flexible wall and an essentially rigid boundary portion thereof; (b) a pump chamber between the body parts, the flexible wall at least partly defining the pump chamber; (c) actuating means for displacing the flexible wall along a displacement axis in a dispensing stroke to alter the volume of the pump chamber, and (d) inlet and outlet valve means respectively for admission of material to and discharge of material from the pump chamber; the flexible wall having a rest condition and comprising at least one facet having a concave boundary and a curved surface portion interrupting the facet for inducing bending of the facet in the dispensing stroke to produce a restoring force tending to restore the flexible wall to the rest condition, the curved surface portion being inclined to the facet and meeting it along the concave boundary.