Dispensing – Movably mounted supply container – Moving relatively to trap – impeller or valve to cause discharge
Patent
1988-08-11
1991-05-21
Shaver, Kevin P.
Dispensing
Movably mounted supply container
Moving relatively to trap, impeller or valve to cause discharge
222183, 222325, 222383, 239274, B67D 564
Patent
active
050167812
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for emitting a finely divided stream of liquid into the atmosphere from a replaceable container, which device is provided with a carrier with means for attaching the carrier to a support, means for detachably receiving and supporting a container containing liquid and also a suction line, projecting into the liquid, whose discharge end projects outside the container and works in combination with a pump which is also received in the carrier and has an actuating element which can work in combination with an element capable of moving with respect to the fixed carrier.
Such a device is known for example from Swiss Patent 382,922. Said known device is intended for periodically emitting a perfume or disinfectant or similar agent, for example in toilets and similar rooms every time the door which provides access to said room is opened or closed. In said known device, the pump consists of a housing with a piston which has an actuating rod projecting outside the housing with which the piston can be displaced against spring pressure, the air present in the cylinder of the pump then being forced through an atomizing opening to the outside. The suction line projecting into the container has a discharge end which debouches near the atomizing opening. The atomization takes place because the stream of air flowing across the discharge end of the feed line produces a low pressure in the suction line, as a result of which a quantity of liquid from the container is atomized. This occurs every time when the actuating rod of the piston runs up against the frame of the door when the door is closed.
The operation of such an atomizer is insufficiently reliable. In addition, it is not clear how, in said known device, the replaceable container and suction line can be brought into combined operation with each other without risk of leakage when fitting a full container or removing a not completely empty container. An atomizer which is based on the Pitot principle will also start to work increasingly more unsatisfactorily as the filling of the container decreases because the distance between the liquid level in the suction line and the atomizer becomes increasingly larger.
The object of the invention is to provide a device which operates reliably regardless of the degree of filling of the container in which the container can easily be replaced without risk to the environment and which lacks the drawbacks of the known device.
SUMMARY OF THE INVENTION
According to the invention this object is achieved in that the discharge end of the suction line debouches into a fitting which is provided with a nonreturn valve preventing return flow and which forms part of the container and fits so as to form a seal into a recess in the pump housing, which recess has a connection to the interior of the pump situated on the compression side of the pump, piston or plunger, which pump housing has an atomizer with a nonreturn valve which is situated upstream of the atomizer and opens in the direction of the atomizer opening. The suction line, which in-any case debouches with its discharge end into the fitting provided with a nonreturn valve, forms together with said fitting and nonreturn valve a component of the replaceable container. Installation of such a container is nothing more than inserting the fitting into the recess intended for the purpose in the pump housing. The removal takes place correspondingly in a simple manner.
Spillage during the installation or removal of a container cannot take place and may, in addition, be prevented in a simple manner by installing a closure cap over the fitting.
The pump which can be actuated during the opening and/or closing of, for example, a door, is a double-action pump of which only cylinder piston or the atomizer with nonreturn valve installed in the discharge are received in the carrier. After all, the valve in the suction line forms a part of the container. If a container is absent, the pump will not therefore work.
Attention is drawn to the fa
REFERENCES:
patent: 2534465 (1950-12-01), Marini
patent: 2558469 (1951-06-01), Travis
patent: 2728608 (1955-12-01), Marini
patent: 2821435 (1958-01-01), Wenner
patent: 3224644 (1965-12-01), Davis
patent: 4164306 (1979-08-01), Perrin
patent: 4166553 (1979-09-01), Fraterrigo
patent: 4394938 (1983-07-01), Frassanito
patent: 4579261 (1986-04-01), Arabian et al.
Shaver Kevin P.
Williams Trading B.V.
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