Fluid sprinkling – spraying – and diffusing – Including supplemental gas shaping or shielding jet – Plural sets of gas jet orifices
Reexamination Certificate
2000-01-10
2001-05-15
Scherbel, David A. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Including supplemental gas shaping or shielding jet
Plural sets of gas jet orifices
C239S300000
Reexamination Certificate
active
06230986
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to sprayers for paints, lacquers etc and move automatically to spraying guns.
BACKGROUND OF THE INVENTION
It is known that such guns, whether automatic or manual, comprise a spray head to which is fed the spray substance and a pressurized propellant gas, which foremost is compressed air. Such a spray head consists of an assembly of parts cooperating in spraying and which mainly are the following:
a spray nozzle,
a needle translatable to open or close the orifice of the spray nozzle,
a gas-blowing cap-piece, and
a gas distributing bush, generally called the deflecting bush, allowing propellant gas to feed to the cap-piece and optionally to distribute the gas in a circular or flat jet of spray substance.
In the known guns, the nozzle is affixed on the gun body and as a result its disassembly is fairly complex. Intrinsically, however, the user must often handle the nozzle to clean it or replace it. Moreover, as regards these known guns, by the very affixation of the nozzle on the gun body, the path of the spray substance cannot be smooth and makes cleaning more difficult.
SUMMARY OF THE INVENTION
The objective of the present invention is to remedy the above-identified drawback and relates to a spray head wherein said nozzle is easily disassembled while also providing a smooth path of the spray substance in the region of the nozzle is assured.
For that purpose, the spray head of the invention used with a sprayer for a substance such as paint or lacquer, comprises a body on which are mounted the following:
A tubular spray nozzle fed with a spray substance from a conduit in the body and fitted at one of its ends with a spraying orifice which shall be opened or closed by a displaceable needle, a gas blowing cap-piece, and a gas distributing bush fed with pressurized gas from at least one conduit in the body and allowing to homogeneously feed the cap-piece with propellant gas and optionally to distribute the gas in a manner to vary the cross-section of the jet generated at the exit of said spraying orifice. This spray head is characterized in that the body comprises a planar surface wherein issues the conduit feeding the substance to be sprayed, the nozzle comprises a planar annular surface on the side opposite the spraying orifice.
A seal is inserted between the annular nozzle surface and the free end of the conduit feeding the spray substance.
The gas distributing bush comprises a planar end surface, and is able to guide and keep in place the nozzle.
A clamping mechanism is used to simultaneously mutually compress the planar end surface of the distribution bush and the planar surface of the body and press the seal between the planar annular surface of the nozzle and the free end of the conduit feeding the spray substance,
In this manner the nozzle is kept pressed between the distribution bush and the body of the spray head of the invention and is easily disassembled by operating the clamping mechianism. Moreover the path of the substance between the conduit for the spray substance, the seal and the nozzle, is free from roughness and therefore can be smooth. Lastly, because there is no intermediate seal between the distribution bush and the body, assembly and disassembly of the spray head are especially well simplified.
In an advantageous embodiment mode of the invention, the spray head is characterized in that the planar surface of the body is fitted with a tubular stub wherein the spray substance issues from the feed conduit, the free annular end of the stub being planar and parallel to the planar surface of the body and constituting the free end of the conduit feeding the spray substance.
The gas distributing bush comprises a Continuous central orifice wherein the nozzle is guided and kept in place and thanks to which the distribution bush may be affixed on the tubular stub. Accordingly, the tubular stub acts to center the distribution bush relative to the body of the spray head.
Moreover, in a special embodiment, the clamping mechanism is implemented in a simple manner due to cooperating threads on the tubular stub and in the central orifice of the distribution bush.
In such an embodiment, the feed of a spray substance and of propellant gas from the body can be carried out in such manner that the gas feed conduit issues into a circular recess in the planar body surface, the recess being concentric with the tubular stub. The end surface of the gas distribution bush is fitted with a circular duct concentric with the central orifice, and the circular recesses of the body and the duct of the distribution bush communicate with each other when the planar body surface and the planar end surface of the distribution bush are compressed against each other.
It is furthermore known with respect to conventional guns that the air cap-piece in general is screwed onto the spray head. Intrinsically; however, the air cap-piece is subject to frequent operator intervention either to orient the jet of paint or to replace the air cap-piece. Consequently, the affixation system of the air cap-piece on the gun is vulnerable and its destruction or change inevitably entails replacement of the spray head or all of the body, that is it entails costly intervention.
To remedy this drawback, the present invention mounts the gas-blowing cap-piece in detachable but firm manner on the gas distributing bush.
Accordingly, the present invention uses the gas distributing bush simultaneously to affix the nozzle and to affix the gas blowing cap-piece.
Preferably, the gas blowing cap-piece is mounted on the distribution bush by a nut cooperating with a thread on the outside periphery of the bush.
The spray head of the present invention may be integral with the sprayer and in a design variation, the spray head may also be mounted on the sprayer.
REFERENCES:
patent: Re. 19907 (1936-03-01), Krautzberger
patent: 1655254 (1928-01-01), Binks
patent: 2544123 (1951-03-01), Anderson
patent: 2743963 (1956-05-01), Peeps
patent: 3096023 (1963-07-01), Thomas
patent: 3332623 (1967-07-01), Gallant
patent: 4744518 (1988-05-01), Toth
patent: 4899938 (1990-02-01), Havrilla, Jr.
patent: 5421518 (1995-06-01), Robisch et al.
Chatron Michel
Vacher Eric
Bocanegra Jorge
ITW Surfaces and Finitions
Lowe Hauptman & Gilman & Berner LLP
Scherbel David A.
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