Fluid sprinkling – spraying – and diffusing – Including supply holder for material – To be mixed – dissolved or entrained in a flowing liquid...
Patent
1999-06-01
2000-10-03
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Including supply holder for material
To be mixed, dissolved or entrained in a flowing liquid...
239407, 2394275, 2394285, 239432, 137901, 137876, 137627, 1341001, 134 992, 134 953, 134123, A62C 502, B05B 726
Patent
active
061260894
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a cleaning lance, of the type used for cleaning the exterior of vehicles for example. Such cleaning lances normally incorporate a barrel having a high pressure nozzle which is used to direct a high pressure water jet at the exterior of the vehicle. Such cleaning lances are normally supplied with pressurised water from a pump driven by an electric motor or a petrol engine and in many cases detergent is fed into the water flow at the site of the pump.
FR-1,363,426 discloses a cleaning lance having a mixing chamber in which an axially directed water jet sucks in air from an air inlet and detergent from a detergent inlet and forms a foam which is ejected axially from the outlet of the chamber. The air inlet and detergent in let are diametrically opposed within the mixing chamber.
FR-A-2,519,881 discloses a hand held cleaning lance having two barrels mounted on a common body and valve means incorporated in the body of the lance and operable by the user to switch pressurised fluid from an inlet of one barrel to an inlet of the other barrel, the barrels being arranged to form jets of different characteristics and the valve means comprising a freely movable valve member which is retainable by fluid pressure to selectively block said inlets.
However, in FR-A-2,519,881 the two barrels are located side by side and the movable valve member is movable by inclining the lance slightly about its longitudinal axis.
Since only one of the barrels is connected to a detergent bottle, and the barrels are in any case of different lengths and bore sizes, an unbalanced arrangement results, which is not ergonomic.
A further problem with the above arrangement is that the valve member easily rolls from one side to the other if pressure is interrupted, so it is possible to accidentally switch to a detergent stream. This can be dangerous because detergent is sometimes corrosive.
U.S. Pat. No. 4,202,495 discloses a nozzle head selector for one or more nozzles located at the end of a single barrel, the selector being located at the nozzle end of the barrel. The selector has a changeover device formed by a ball which moves under gravity when the pressure is turned off to allow changeover of jets without changing the nozzle head, the jet being selected by slightly turning the barrel. Such a changeover device in being located at the nozzle end is able to operate under lower pressures and although some leakage may be acceptable at the nozzle end, no leakage is acceptable at a user end of a cleaning lance.
The present invention seeks to at least partially mitigate the foregoing difficulties.
In accordance with this invention there is provided a cleaning lance comprising a mixing chamber having two adjacent barrels, a first barrel being arranged to form a rinsing stream and a second barrel being arranged to form a stream of mixed water and detergent, the first and second barrels having a common water inlet and valve means for selectively coupling the water inlet to a respective one of the barrels and a coupling arranged to support a detergent container below both barrels, the detergent being admitted into said second barrel wherein in the second barrel there is provided a mixing chamber where by Venturi action the water injected into the mixing chamber is mixed with detergent from said container and ejected from an outlet nozzle, wherein said first and second barrels are located one above another, in use, with the coupling being arranged to hold the container being located below the barrels, a mesh being located in the second barrel downstream of the mixing chamber for foaming the mixture, the first and second barrels being coupled by latching valve means to a common water inlet, the valve means having a default position in which said valve means selectively couples the first barrel to the water inlet, said valve means being operable by a user on reducing water pressure at the water inlet; wherein said valve means comprises a rolling or sliding valve member which is movable to selectively block one of a lower i
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patent: 5850973 (1998-12-01), Liljeqvist et al.
Kirk Colin J
Williamson Martin
Deb Ip Limited
Douglas Lisa Ann
Kashnikow Andres
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