Media dispenser

Details Media dispenser Media dispenser

1999-02-22

2001-04-03

Shaver, Kevin (Department: 3754)

Dispensing

With discharge assistant

With movable nozzle interconnected therewith

C222S207000

Reexamination Certificate

active

06209760

ABSTRACT:

TECHNICAL FIELD AND BACKGROUND OF THE INVENTION
The invention relates to a dispenser in which media of all possible aggregations may be stored in a tightly sealed condition or discharged. The dispenser is intended to be clasped, freely carried and/or actuated single-handedly. The medium may be liquid, pasty, powdered, gaseous and/or granular. It is precisely metered when discharged. The dispenser is composed mostly or completely of injection-molded or plastics parts. All internal surfaces coming into contact with the medium are made from polymeric material The medium is atomized or, where necessary, discharged in larger droplets.
OBJECTS OF THE INVENTION
One object of the invention is to provide a dispenser which avoids the disadvantages of prior art configurations or contributes to the advantages cited below. A further object is to make the dispenser sealingly tight against leakage. Still a further object is to achieve reliable dispenser function or a simple construction. A still further object is to contribute to and facilitate assembly of the dispenser. A further object is to avoid contamination of the stored medium with soil or germs. A still further object is to contribute to fastening of the dispenser to a reservoir without damage, in particular to sensitive resilient members, like piston lips.
SUMMARY OF THE INVENTION
According to the invention, the dispenser comprises a dispensing wall penetrated by a medium duct. The dispensing wall is substantially integral with two portions of a traveling member spaced from each other or from the wall. The traveling member includes a medium impeller such as a plunger, a base body closure such as a slidable cylinder cover, a valve body element, and a base body blocking member. Each traveling member includes a sliding or stopping face, particularly an inner or outer circumferential face, an edge face and/or an end face. This face can also be a single annular edge of a plunger lip sliding by this edge only.
The traveling member that is penetrated by the medium duct mounts between its ends or is spaced away from a runner body extending at least up to its external face or projecting therefrom. This body is axially and/or radially firmly connected to the runner and forms actuating handles. Such a body may also support a plunger lip against receiving excessive movements when this plunger lip is less thick than the remaining portions of the body carrying it.
The compression or pump chamber is bounded on the inner circumference by two separate components. One component forms the sole sealing face for one or two plunger lips. The other component forms a medium inlet body. Both parts together form two concentric, nested, annular end faces for common support on the end face of the bottleneck.
Also, means are provided to positively limit an operating position like the actuated end position by stops and to then hold the plunger lip free of axial and/or radial compressive forces. Thereby, the dispenser, when in the actuated end position, can be axially and forcibly brought into firm engagement with the reservoir or some other base support without the plunger lip being damaged by such compressive forces. Between the stop faces of the dispenser a separate stop member may also be provided which after assembly does not remain on the dispenser.
In including the features, such as configurations, effects etc. in the present invention, reference is made to U.S. Pat. No. 5,938,084, issued Aug. 17, 1999; U.S. Pat. No. 5,927,559, issued Jul. 27, 1999; U.S. Pat. No. 5,884,819, issued Mar. 23, 1999 and U.S. Pat. No. 6,059,150, issued May 9, 2000. The invention is also suitable for dispensers having a reservoir which is intended for a once-only use or for being emptied in a single operating stroke. Such dispensers may be provided for operation through a unidirectional, individual and interrupted or uninterrupted stroke. Thereby, the medium reservoir is a pressure chamber provided in a vessel, and the vessel has a cap with one or more traveling members.


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