Abstract: A device (2) for fitting to the neck of a deformable bottle (4) to give a metered dose of liquid when the bottle is squeezed. The liquid dispensed through outlet (30) has to pass through a metering chamber (34) in which it is directed around or through a freely-moving shuttle (8), movement of the shuttle (8) with the flow being resisted by the creation of a partial vacuum in the expanding control chamber (42) behind the shuttle, so that the rate at which the shuttle moves to the outlet end of the metering chamber (34) to close the outlet (30), and hence the amount of liquid dispensed, is controlled by the rate at which liquid can enter control chamber (42). Because it is configured so that all the liquid enters metering chamber (34) at its inward end, the chamber may fitted either inside or outside the neck of the bottle (4) and the dose may be adjusted by moving the outlet (30) closer to, or further from, the inlet.

Abstract: A dispenser pump has an arrangement for sucking material out of its discharge nozzle after a dispensing stroke, to avoid clogging. The material is sucked through a suck-back passage provided by minor non-complementarity between a resilient outlet valve disc and its valve seat. The ball of the inlet valve is arranged to travel vertically in a tubular portion of the inlet passage in which it is a blocking fit, between its valve seat and an open cut portion where fluid flows freely past it into the pump chamber. During recharging at the pump chamber the ball is held in the open cut position. Once recharging stops, the ball falls gradually down the tubular position, drawing liquid back through the pump chamber until the inlet valve reseats.

Abstract: A dispenser pump, for fitting to a container neck to dispense liquids in small doses, has a pump body (39) with a fixed discharge nozzle (25) and a reciprocable plunger to pump liquid through a valved inlet (41) of a pump chamber (38) and out through the discharge nozzle. To enable the pump body (39) to be recessed into the container neck, the discharge nozzle (25) near the top of the pump chamber and the outlet near the bottom of the pump chamber are connected by a discharge channel (48) extending up through the pump body alongside the pump chamber (38). A tamper evident locking closure holds the plunger (70) in a particular rotational orientation in which it is locked down. Breaking and removing the tamper evident element simultaneously turns the plunger (70) to free it to rise.

Abstract: 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.

Abstract: A dosing device for dispensing liquid from a container comprises an outlet passage for the liquid and an obturator, such as a flap or piston, that is adapted to be driven to block the outlet passage, once a quantity of liquid has been dispensed, under the influence of liquid flowing from the container through a small aperture into a space behind the obturator in a chamber in which the obturator is movable. The outlet passage has a convoluted configuration whereby flow of liquid through it is directed at least partly back towards the obturator to exert a back-pressure thereon, the obturator being of a dimension such that it may be acted on by liquid in part of the passage in which the flow is thus directed back. The chamber may have a moveable wall portion that opens up a large aperture to allow rapid restoration of the obturator to its start position.

Abstract: A dispenser pump has pump chamber (34) whose volume is variable to draw up or discharge material, by the axial movement of a cup (25) on a stationary hollow stem (12). The seal (16) between them slides on an inner wall of the cup. A collector (30) at the lower end of the cup causes any material leaked past the seal to be guided inwardly to apertures (33) where it may drop to a body part (9) and pass via apertures (11') to a container (1) of the material.