Dispenser pump

Details Dispenser pump Dispenser pump

1996-09-23

1998-10-06

Kashnikow, Andres

Dispensing

With discharge assistant

With movable nozzle interconnected therewith

2223217, 222494, 2223833, B65D 8854

Patent

active

058164537

DESCRIPTION:

BRIEF SUMMARY
This specification relates to dispenser pumps for dispensing fluids, particularly but not exclusively hand-operated pumps, and particularly but not exclusively pumps suitable for dispensing thick, pasty, viscous or setting liquids.
A dispenser pump of the general type to which our proposals relate has a pump, body defining a pump cheer (preferably cylindrical), a pump piston reciprocable in, the chamber, preferably manually, to alter its volume in a pumping stroke, an inlet for fluid to enter the pump chamber through a unidirectional valve (such as a ball or flap) from a container of product, and an outlet for fluid to leave the pump chamber, preferably also through a unidirectional valve such as a ball or flap, to a discharge opening. Desirable features include the following. to recharge the pump chamber after each pumping stroke. opening as part of a head of the piston, e.g. to reciprocate with it. compensate for dispensed product. by a snap-on or threaded cape to a container of material to be dispensed, and preferably fixed on the body but possibly fixed to the piston. inserted ("locked-down") condition relative to the pump body, to prevent operation of the pump e.g. for transport or display, and preferably including means for preventing fluid from leaking through the pump in the locked condition.
An embodiment of a preferred general form of pump (referred to below as "the preferred general form") is in our GB-A-2 111 132. This is a pup portable and operable in one hand. A closure cap element, for fitting onto a product container for product intake, is directed sideways on the pump body, i.e. transversely to the pump's axial direction. The rear end of the pump body has a rearwardly-directed grip surface to seat between the thumb and first finger of a user's hand. The piston has a cross-piece with forwardy-directed grip surfaces grippable by two fingers of that same hand, extending transversely on opposite sides of the piston axis for one handed operation.
Such a pump is a preferred context for new proposals made herein.
One aspect herein is concerned with avoiding clogging of an elongate discharge channel or nozzle by dried product. This is a special problem with thick fluids, such as some fabric conditioners and medicaments. The drying of product in the nozzle can make dispensing difficult or impossible. It can cause liquid product to be dispensed with unpredictable speed or direction variations, and may reduce dose accuracy.
It is known to provide a suck-back arrangement to draw fluid out of the nozzle after dispensing.
U.S. Pat. No. 4,991,747 (Risdon) keeps the outlet valve open over a small initial portion of the recharge stroke, by an interaction between the outlet valve body and a body steam projecting up into the hollow piston, or by lost motion between the outlet valve body and its seat. The outlet valve body is a rigid, unsprung sliding component.
U.S. Pat. No. 5,234,135 (Valois SA) has a multi-part piston
ozzle assembly, the space downstream of the outlet valve having a relatively enlarged part and a narrow nozzle. At the end of the recharge stroke the return spring takes up lost motion between piston
ozzle assembly components, expanding the enlarged part to suck material back from the narrow nozzle. The outlet valve operates by axial movement between rigid components of the complex assembly.
Our aim is to provide new and useful dispenser pumps, with suck-back arrangements. Preferred aims include
In one aspect we propose that the pump's outlet assembly provides a suck-back passage open in the closed condition of the outlet valve. This can give a longer period over which suck-back can act, enabling improved results with thick/viscous liquids.
In another aspect, a suck-back passage may bypass the outlet valve or may be defined at least partially through it. In particular a movable outlet valve member, such as a resiliently deformable member, and preferably an elastomer layer, desirably controls it or defines it at least in part. (Note: "suck-back passage" comprehends plural suck-back passages

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