US3716024A — A device for spraying an electrified powdered mat…

Claim 1

Independent Claim 311 words

A device for spraying an electrified powdered coating or treating material onto the surface of a structure, comprising a cabin having opposed walls, means for conveying and supporting said structure in a path in the cabin, means defining apertures in said opposed walls for the passage of said conveying and supporting means and said structure, means for maintaining the interior of the cabin at a pressure lower than a pressure prevailing outside the cabin, spray distributing means located in the cabin for spraying onto said structure supported in said path a mixture of air and said powdered material, means for Creating a difference of electrostatic charge between said powdered material of said mixture and said structure, the spray distributing means comprising at least one hollow element, spray outlet means in form of a longitudinally extending slot in the hollow element, means for dividing said mixture issuing from said outlet means into a plurality of spray jets, said dividing means comprising an element which extends from within the hollow element into said slot and defining, with said outlet means, orifices producing jets of said mixture, a powdered material tank adjacent a lower part of the cabin, adjustable means for metering the amount of powdered material taken from the tank and mixing the material with air, said adjustable means for metering and mixing the powdered material comprising means defining a cavity having an inlet disposed in the tank for receiving the powdered material in the tank, a compressed air supply pipe for connection to a source of air under pressure for supplying air to said cavity and means for putting said cavity in communication with the hollow element of the spray distributing means, and means for recovering excess powdered material which has not become deposited on said structure, said recovering means being capable of guiding back said excess powdered material into the tank.

Claim 2

Independent Claim 311 words

A device for spraying an electrified powdered coating or treating material onto the surface of a structure, comprising a cabin having opposed walls, means for conveying and supporting said structure in a path in the cabin, means defining apertures in said opposed walls for the passage of said conveying and supporting means and said structure, means for maintaining the interior of the cabin at a pressure lower than a pressure prevailing outside the cabin, spray distributing means located in the cabin for spraying onto said structure supported in said path a mixture of air and said powdered material, means for Creating a difference of electrostatic charge between said powdered material of said mixture and said structure, the spray distributing means comprising at least one hollow element, spray outlet means in form of a longitudinally extending slot in the hollow element, means for dividing said mixture issuing from said outlet means into a plurality of spray jets, said dividing means comprising an element which extends from within the hollow element into said slot and defining, with said outlet means, orifices producing jets of said mixture, a powdered material tank adjacent a lower part of the cabin, adjustable means for metering the amount of powdered material taken from the tank and mixing the material with air, said adjustable means for metering and mixing the powdered material comprising means defining a cavity having an inlet disposed in the tank for receiving the powdered material in the tank, a compressed air supply pipe for connection to a source of air under pressure for supplying air to said cavity and means for putting said cavity in communication with the hollow element of the spray distributing means, and means for recovering excess powdered material which has not become deposited on said structure, said recovering means being capable of guiding back said excess powdered material into the tank.

Claim 3

Independent Claim 311 words

A device for spraying an electrified powdered coating or treating material onto the surface of a structure, comprising a cabin having opposed walls, means for conveying and supporting said structure in a path in the cabin, means defining apertures in said opposed walls for the passage of said conveying and supporting means and said structure, means for maintaining the interior of the cabin at a pressure lower than a pressure prevailing outside the cabin, spray distributing means located in the cabin for spraying onto said structure supported in said path a mixture of air and said powdered material, means for Creating a difference of electrostatic charge between said powdered material of said mixture and said structure, the spray distributing means comprising at least one hollow element, spray outlet means in form of a longitudinally extending slot in the hollow element, means for dividing said mixture issuing from said outlet means into a plurality of spray jets, said dividing means comprising an element which extends from within the hollow element into said slot and defining, with said outlet means, orifices producing jets of said mixture, a powdered material tank adjacent a lower part of the cabin, adjustable means for metering the amount of powdered material taken from the tank and mixing the material with air, said adjustable means for metering and mixing the powdered material comprising means defining a cavity having an inlet disposed in the tank for receiving the powdered material in the tank, a compressed air supply pipe for connection to a source of air under pressure for supplying air to said cavity and means for putting said cavity in communication with the hollow element of the spray distributing means, and means for recovering excess powdered material which has not become deposited on said structure, said recovering means being capable of guiding back said excess powdered material into the tank.

Claim 4

Independent Claim 311 words

A device for spraying an electrified powdered coating or treating material onto the surface of a structure, comprising a cabin having opposed walls, means for conveying and supporting said structure in a path in the cabin, means defining apertures in said opposed walls for the passage of said conveying and supporting means and said structure, means for maintaining the interior of the cabin at a pressure lower than a pressure prevailing outside the cabin, spray distributing means located in the cabin for spraying onto said structure supported in said path a mixture of air and said powdered material, means for Creating a difference of electrostatic charge between said powdered material of said mixture and said structure, the spray distributing means comprising at least one hollow element, spray outlet means in form of a longitudinally extending slot in the hollow element, means for dividing said mixture issuing from said outlet means into a plurality of spray jets, said dividing means comprising an element which extends from within the hollow element into said slot and defining, with said outlet means, orifices producing jets of said mixture, a powdered material tank adjacent a lower part of the cabin, adjustable means for metering the amount of powdered material taken from the tank and mixing the material with air, said adjustable means for metering and mixing the powdered material comprising means defining a cavity having an inlet disposed in the tank for receiving the powdered material in the tank, a compressed air supply pipe for connection to a source of air under pressure for supplying air to said cavity and means for putting said cavity in communication with the hollow element of the spray distributing means, and means for recovering excess powdered material which has not become deposited on said structure, said recovering means being capable of guiding back said excess powdered material into the tank.

Claim 5

Dependent Claim 27 words

A device as claimed in claim 1, wherein said means for putting said cavity in communication with the hollow element comprises a tube for homogenizing said mixture.

Claim 6

Dependent Claim 94 words

A device as claimed in claim 1, wherein the spray outlet means comprise means defining an elongate opening in the hollow element and the dividing means comprise a strip located in said opening and having two opposed faces and notches in said opposed faces, the notches in each of said opposed faces being spaced equal distances apart from each other and the notches of one of said opposed faces being in staggered relation to the notches of the other of said opposed faces, said notches defining with said opening outlets producing said spray jets.

Claim 7

Dependent Claim 79 words

A device as claimed in claim 1, wherein the spray outlet means comprise means defining an upwardly extending elongate opening in the hollow element and the dividing means comprise an upwardly extending strip located in said opening and having a plurality of transversely extending teeth which define a plurality of gaps which progressively increase in length from one gap to another in the direction upwardly of the strip, said teeth having outer ends substantially parallel with said elongate opening.

Claim 8

Dependent Claim 70 words

A device as claimed in claim 1, wherein the spray outlet means comprise means defining an upwardly extending elongate opening in the hollow element and the dividing means comprise an elongate member having transversely extending loop portions defining transverse corrugations which progressevely increase in transverse extent from one corrugation to another in the direction upwardly of the member, said corrugations having outer end portions substantially parallel with said elongate openings.

Claim 9

Dependent Claim 37 words

A device as claimed in claim 1, wherein the means for creating a difference of electrostatic charge comprise a wire extending in front of the spray outlet means and a high-frequency current generator connected to said wire.

Claim 10

Dependent Claim 50 words

A device as claimed in claim 1, wherein the means for creating a difference of electrostatic charge comprise said means for dividing said mixture which is in the form of an electrically conductive element extending in the spray outlet means and a high-frequency current generator connected to the conductive element.

Claim 11

Dependent Claim 78 words

A device as claimed in claim 1, wherein the metering and mixing means comprise a tube having a small lower inlet portion adjacent and in spaced relation to a bottom wall of the tank and a large upper outlet end portion, an adjustable shutter associated with the tube for variably closing the outlet end portion, the tube defining said cavity and said cavity communicating with the hollow element in a region intermediate said end portionS of the tube.

Claim 12

Dependent Claim 28 words

A device as claimed in claim 1, wherein the tank is disposed below the cabin and a passageway connects the tank to the recovering means which are vibratory.

Claim 13

Dependent Claim 59 words

A device as claimed in claim 9, wherein the recovering means comprise a hopper located at the base of the cabin, resiliently yieldable means connecting the hopper to a lower part of the cabin and allowing vibration of the hopper relative to the cabin, and vibrating means associated with the hopper for vibrating the hopper, said passageway being flexible.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1976-02-13	1976-08-14	1977-02-13	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1980-02-13	1980-08-14	1981-02-13	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1984-02-13	1984-08-14	1985-02-13	$7700.00	Window Closed / Lapsed

A device for spraying an electrified powdered material onto a structure

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