Fluid sprinkling – spraying – and diffusing – With cleaning means – drip collecting – waste disposal or soil... – Nozzle cleaner – flusher or drainer
Reexamination Certificate
1999-10-20
2001-01-30
Morris, Lesley D. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
With cleaning means, drip collecting, waste disposal or soil...
Nozzle cleaner, flusher or drainer
C239S119000, C239S127000
Reexamination Certificate
active
06179222
ABSTRACT:
The present invention concerns a device for pumping liquid or paste media to an applicator, for example a spray gun, with a pump which is connected to a reservoir tank via a suction line and to the applicator by a pump line.
In pumping devices of this type, the suction line is often provided with a relatively large internal diameter in order to ensure that the paste materials are reliably sucked in. The flow speeds in the suction lines are therefore slow, with the effect that deposits on the inner wall of the suction line are unavoidable, as is time-consuming cleaning work. This is achieved by using the pump to draw up a solvent or water from a separate container and directing this solvent or water through the components which are involved in pumping the materials. Although the pump, the pump line and the fittings do get flushed through and cleaned with this method, the deposited material in the suction line is not carried away in the required fashion because the speeds of flow are slow as a result of the large internal diameter. From time to time, therefore, it is essential to replace the blocked suction line in these pumping devices.
The task of the present invention is therefore to configure the device for pumping liquid or paste media to an applicator of the type mentioned initially in such a way that the suction line can also be cleaned using the pump in a straightforward and satisfactory manner. The constructional complexity required to achieve this should be kept at a low level whilst, nevertheless, the reliable removal of deposits from the suction line should be assured.
In accordance with the present invention, this is achieved in a device for pumping paste media to an applicator of the aforementioned type in that the pump line can be connected to the suction line directly or by means of the applicator in order to clean the pump, the suction line and/or the pump line.
At the same time, it is advantageous to provide the suction line with a connection pipe in the form of a sleeve to which the pump line or the applicator can be connected so as to prevent the leakage of liquid and to equip the connection pipe with a check valve which, in a preferred embodiment, is spring loaded, with it further being advantageous to provide the connection pipe with one or more nozzle apertures worked into its sleeve and opening into the suction line. At the same time, the sleeve can be provided with diametrically opposite nozzle apertures running in the lengthways direction of the suction line, although it is also possible for the nozzle apertures of the connection pipe to be configured as swirl nozzles.
The pump line or the applicator can be connected to the connection pipe of the suction line in a simple manner by means of a union nut provided on the applicator, also the connection pipe should be arranged in a bend of the suction line.
In a suction line provided with a cleaning aperture, the closure flange of the suction line can be provided with a connection pipe for the pump line or the applicator.
If a device for pumping liquid or paste media to an applicator is embodied in accordance with the present invention, it is a very straightforward and quick matter reliably to clean the components which are involved in pumping a medium, in particular however the suction line. Because the pump line can be connected to the suction line without difficulty, it is namely possible to pump the medium, a solvent or water, into the suction line at high speed and in a circuit, with the result that deposits in the suction line are carried away and the suction line is therefore cleaned to a sufficient extent. The proposed embodiment for the operation of the pumping device is therefore improved significantly with little constructional complexity and malfunctions, in particular lengthy interruptions in operation, are avoided.
REFERENCES:
patent: 1816555 (1931-07-01), Ward
patent: 4522789 (1985-06-01), Kelly et al.
patent: 4746063 (1988-05-01), Roberts
J. Wagner GmbH
Morris Lesley D.
Pandiscio & Pandiscio
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