Dispensing – With discharge assistant – With movable nozzle interconnected therewith
Patent
1985-08-13
1988-03-01
Bartuska, F. J.
Dispensing
With discharge assistant
With movable nozzle interconnected therewith
222341, 222382, 222383, 222385, 239333, B05B 1102, B05B 100
Patent
active
047280093
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase application corresponding to the PCT/DE84/00257, filed Nov. 30, 1984 and based, in turn, upon German applications Nos. G83 35 862.5 of Dec. 14, 1983 and G84 31 062.6 of Oct. 23, 1984 under the International Convention.
FIELD OF THE INVENTION
The present invention relates to a spray pump with container connector wherein through the actuation of a pump piston slidable in a case bore a vent in contact with the atmosphere is opened, or closed, with respect to the container.
BACKGROUND OF THE INVENTION
Such spray pumps are used to draw liquids from containers and for the spraying, or atomizing of a predosed quantity of liquid. These spray pumps having casings connectable to the container are actuated mechanically from the outside by means of levers or the like, acting upon the different pumping devices. Due to the negative pressure resulting each time, a certain amount of liquid is aspired from the container through an aspiration tube, whereby in the container atmospheric pressure is maintained. The aspired liquid is directed towards a spray nozzle via a liquid supply duct, due to further pressure on the pump piston; in front of the spray nozzle a swirl chamber, for instance, can be mounted. During each compression stroke, the container is ventilated, so that the atmospheric pressure in the container is reestablished.
Spray pumps of various kinds are known which, for instance, can be threaded to the container via a connector piece or via an intermediate piece and a connection nut. It is known to act upon the elastical sealing collar of the intermediate piece through the lever actuating the pump and the corresponding rods so that this collar is pressed away from the surface to be sealed at each actuation, leaving a passage for the ventilation of the container. It is also known to unblock a vent leading to the container connector via the pump piston sliding in a corresponding bore of the casing. In both cases it is necessary to control the ventilation in order to avoid unintended discharge of the liquid through the vent in the corresponding, or reversed position of the container with the spray pump threaded thereto. For this reason the vent has to be sealed towards the outside. The known actuation means for ventilation require additional parts, or bore channels.
OBJECT OF THE INVENTION
It is the object of the present invention to simplify the construction of the necessary ventilation system via the container connector in a spray pump as described above.
SUMMARY OF THE INVENTION
The object of the invention is attained with a spray pump having a crown-shaped lip seal on the pump piston or its rod, which prior to the actuation of the piston is pressed sealingly against a smooth segment of the casing bore and after the displacement of the piston in pumping direction, allows for the opening of a complete or partial annular slot between the lip seal and the inner wall of the bore.
Thereby, a casing bore widening towards the side of the container connector and an open connection from the casing bore to the container connector can be provided. Preferably, this casing bore is conically widened in stages, whereby the opening angles of the conical segments differ from each other.
In such a casing bore constructed according to the invention the lip seal provided on the pump piston merely slides along smooth wall surfaces. Due to its inherent tension, in the closed position the lip seal presses sealingly against the wall of the respective segment of the casing bore. When the pump piston is displaced, the respective lip seal reaches an area, where due to the conical configuration of the casing bore, an open annular slot between the seal and the wall of the bore is created. Thereby, an open connection between both frontal sides of the bore is created. This bore is open from the side where the pressure is applied towards the atmospehre An escape towards the container is provided in the direction of the connector.
A further embodiment of a s
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Ammeen Edward S.
Bartuska F. J.
Dubno Herbert
Ross Karl F.
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