Fluid sprinkling – spraying – and diffusing – Combining of separately supplied fluids – And valving means controlling flow for combining
Reexamination Certificate
2000-03-13
2001-06-26
Scherbel, David A. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Combining of separately supplied fluids
And valving means controlling flow for combining
C239S533110, C239S408000
Reexamination Certificate
active
06250569
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a spraying head suitable for spraying pressurized air and/or an atomized liquid, for example a washing liquid and/or a releasing agent, inside foundry molds or molds for plastic materials, and more precisely relates to a single or to a double head designed to selectively spray, in a controlled manner, pressurized air and/or an atomized liquid from one or both sides, inside molds for casting ferrous and non-ferrous materials.
In many areas of application, in particular in the foundry field, there is the need to spray pressurized air and/or atomized liquids into the cavities of open molds, so as to clean them or to apply a suitable releasing agent.
Single spraying heads are currently used and fastened to an arm of a manipulator, which require the head to be oriented towards the cavities of each of the two half-molds to be cleaned and/or to be treated.
The use of single heads, and the need to direct them towards the two half-molds, entails certain problems and a complexity of movements, both in small and large sizes molds, as well as excessively long down times between the various molding steps.
In molds having a complex configuration, or in cases wherein rapid work with the spraying heads is required, the use of the conventional spraying heads has therefore proved to be limiting and wholly unsuitable for fulfilling the various needs, preventing the high efficiency of the head and broad freedom of movement. Furthermore, the spraying heads presently in use do not allow for a proper adjustment of liquid to be sprayed and a selective feeding of atomized liquid and pressurized air into a mold.
OBJECTS OF THE INVENTION
The main object of the present invention is to provide a spraying head suitable for selectively ejecting pressurized air and/or an atomized liquid substance, for example a releasing agent or another type of liquid inside an open mold, or for other applications, which is highly effective and easy to use.
A further object of the invention is to provide a single or a double spraying head by means of which it is possible to work on one or on opposite sides extremely rapidly, without having to perform excessively complex movements in order to spray the internal cavities of a mold.
Yet a further object of the present invention is to provide a spraying head of the type mentioned above, by means of which it is possible to selectively feed pressurized air and/or an atomized liquid substance preventing, in the absence of pressurized air, the spraying head from leaking and therefore soiling the machine or the area below.
Yet another object of the present invention is to provide a spraying head suitable for spraying pressurized air and/or a treatment liquid, independently in one or in two opposite directions, maintaining the same head extremely small in size and with minimum bulk.
BRIEF DESCRIPTION OF THE INVENTION
According to a first aspect of the invention a spraying head has therefore been provided for selectively generating a jet of pressurized air and of an atomized liquid substance, comprising:
a main body having at least a first mixing chamber and a spraying nozzle;
first conduit means for injection of pressurized air into the mixing chamber on a side opposite to the spraying nozzle;
second conduit means for feeding the liquid substance, said second conduit means comprising a converging portion to define a Venturi which tapers towards the mixing chamber, at right angles to the air injection conduit; and
an actuable, normally closed control valve for said second conduit, said control valve being slidably movable in respect to a flow regulator having a tapered end portion protruding into the Venturi to adjustably restrict the flow path.
According to another aspect of the invention, the control valve comprises an air pressure actuated valve member, coaxially arranged inside the flow regulator; the valve member is provided at the front end of a control stem which extends at the rear to the regulator, to a piston of a single-acting cylinder, and a thrust spring, to bias the valve member backwards in the Venturi, for opening the passage for the liquid. The use of an angularly orientable distributor for the pressurized air to the cylinder of the control valve, which can be angularly oriented around the longitudinal axis of the flow regulator, allows all the inlets of the pressurized air and of the liquid substance to be arranged on a same side of the main body of the spraying head.
REFERENCES:
patent: 3680781 (1972-08-01), Lincoln
patent: 4076173 (1978-02-01), Taccon et al.
patent: 4344919 (1982-08-01), Kelterbaum
patent: 5340026 (1994-08-01), Woodruff
patent: 5655691 (1997-08-01), Stern et al.
patent: 5683037 (1997-11-01), Rochman et al.
Hwu Davis
Scherbel David A.
Tacoon Costruzioni Meccaniche di Girona A. & Taccon D. S.N.C.
Young & Thompson
LandOfFree
Adjustable spraying head does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Adjustable spraying head, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adjustable spraying head will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2466697