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US 7,597,218 B2Granted
Pump with mechanical means for effective priming and drip prevention
AssigneeWordon GmbH
InventorDonald Jan Workum
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AssigneeWordon GmbH
InventorDonald Jan Workum
Estimating the term…
A dispensing device comprising pump for dispensing liquid, the pump comprising a hollow piston moveable within a cylinder, and a valve, controlling the supply of liquid to the piston/cylinder. During a first phase of operation the piston moves outwardly within the cylinder while the valve permits the supply of liquid into the chamber and during a second, subsequent, phase of operation the piston moves inwardly within the cylinder while the valve shuts off the supply of flowable material, with the result that liquid drawn into the chamber during the first phase is pressurized. Arrangements for effective priming and pre-compression of liquid are also described.
A dispensing device comprising a source of a flowable material, a pump for dispensing the flowable material and means for supplying the flowable material to the pump, the pump comprising a hollow piston adapted to move within a cylinder such that the piston and cylinder together define a chamber of variable volume, and an inlet valve controlling the supply of flowable material into the chamber, wherein during a first phase of operation of the pump the piston moves outwardly within the cylinder and the chamber expands, while the inlet valve permits the supply of flowable material into the chamber;
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Pump inlet valves: gate valves; Sliding valves
With means for controlling the flow of liquid entering or leaving the swirl chamber: in response to liquid pressure
Means for neutralising the actuation of the sprayer ; Means for preventing access to the sprayer actuation means: valves not actuated by pressure
Outlet valves actuated by the pressure of the fluid to be sprayed: lift valves
Term ended 13 Apr 2026 (estimated)
The present invention relates to pumps, in particular manually actuated pumps. The present invention further relates to a method of delivering a flowable material using a pump.
Pumps suitable for spraying or otherwise delivering liquid from a container when manually actuated by a user are widely used in the fields of cosmetics and household cleaning products. Typically the pump is mounted on the container and communicates with the liquid by means of a dip tube. When actuated by a user, the pump draws liquid from the container through the dip tube and into the pump body; and then impels liquid from the pump body to an outlet.
Various arrangements of pump, outlet and means for user actuation can be used depending on the properties of the liquid to be delivered, desired outlet flow conditions and cost. For example, trigger spray pumps such as described in U.S. Pat. No. 4,161,288, are commonly used to dispense household cleaning products such as liquid detergents or polishes. Finger pumps as described in EP 682 568A, are often used to dispense cosmetic products such as hand lotions or perfumes.
FIG. 1 is a side sectional view of a pump according to a first embodiment of the present invention for mounting on the neck of a bottle containing a thin liquid to be dispensed;
FIG. 2 is a side sectional view of the pump mechanism of the pump of FIG. 1, in a rest position but with an outlet control cap thereof configured for use;
FIG. 3 is a side sectional view of the pump mechanism of FIG. 2 in an intermediate position of the return stroke;
FIG. 1 shows a pump 2 according to a first aspect of the present invention ready for use, and in the rest position. The pump assembly 2 is for mounting on the threaded neck of a bottle (not shown) by means of a threaded retaining ring 4. The bottle contains a liquid, namely an aqueous, non-viscous, cleaning liquid.
The body 6 of the pump is a single plastics moulding providing:
an inner upright cylinder 8 which snugly receives the upper end of a dip tube 10;