Metered dispenser with pull fill mechanism
First Claim
1. A hand-operated pump dispenser for dosing liquid product from a container, comprising a dispenser body having a closure for mounting the body to the container, a hollow valved piston on said body, and a rotatable plunger assembly mounted on said body for reciprocating movement between at least one extended position outwardly of said body and a fully retracted position toward said body in a substantially upright attitude of the dispenser, the plunger assembly including a cylinder in sliding sealing engagement with said piston to therewith define a variable volume pump chamber in communication with the liquid product through the hollow piston, the body having a plurality of limit stops for limiting movement of the assembly to a selected one of said stops outwardly of the body upon rotation of the plunger assembly for drawing a predetermined amount of product into the chamber upon movement thereof to the at least one extended position, the predetermined amount being dispensed from the assembly upon movement thereof to the fully retracted position while in the upright attitude.
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Accused Products
Abstract
A hand-operated pump dispenser for dosing liquid product from a container includes a rotatable plunger assembly which is manually lifted upwardly relative to the dispenser body for drawing product into a pump chamber in a preselected amount depending on the rotational setting of the plunger, and which is manually depressed for completely discharging the contents of the chamber.
49 Citations
13 Claims
- 1. A hand-operated pump dispenser for dosing liquid product from a container, comprising a dispenser body having a closure for mounting the body to the container, a hollow valved piston on said body, and a rotatable plunger assembly mounted on said body for reciprocating movement between at least one extended position outwardly of said body and a fully retracted position toward said body in a substantially upright attitude of the dispenser, the plunger assembly including a cylinder in sliding sealing engagement with said piston to therewith define a variable volume pump chamber in communication with the liquid product through the hollow piston, the body having a plurality of limit stops for limiting movement of the assembly to a selected one of said stops outwardly of the body upon rotation of the plunger assembly for drawing a predetermined amount of product into the chamber upon movement thereof to the at least one extended position, the predetermined amount being dispensed from the assembly upon movement thereof to the fully retracted position while in the upright attitude.
- 12. A hand-operated pump dispenser for dosing liquid product from a container, comprising a dispenser body having a closure for mounting the body to the container, a hollow valved piston on said body, and a rotatable plunger assembly mounted on said body for reciprocating movement between at least one extended position outwardly of said body and a fully retracted position toward said body in a substantially upright attitude of the dispenser, the plunger assembly including a cylinder in sliding sealing engagement with said piston to therewith define a variable volume pump chamber in communication with the liquid product through the hollow piston, the body having at least one limit stop for limiting movement of the assembly outwardly of the body for drawing a predetermined amount of product into the chamber upon movement thereof to the at least one extended position, said cylinder having at least one projection lying in the path of said limit stop to effect the limiting movement of the assembly, the predetermined amount being dispensed from the assembly upon movement thereof to the fully retracted position while in the upright attitude, and the closure having an upper wall with a container vent port covered in the fully retracted position by the projection on the cylinder.
Specification