US3907202A — Spray-gun apparatus for atomizing paint or simila…

Claim 1

Independent Claim 131 words

Apparatus for atomizing paint or a similar liquid, which comprises a spray-gun of which the atomizing head incorporates a nozzle for the hydrostatic atomization of paint projecting a flat, fan-shaped jet of paint, at least two orifices disposed on either side of said nozzle for directing air jets onto said paint jet, means for feeding paint to said nozzle under a pressure of 10 to 100 bars and means for feeding compressed air to said orifices under a pressure of 0.5 to 2 bars, the atomizing head further comprisng an annular orifice concentric to said hydrostatic atomizing nozzle supplied with compressed air substantially under the same pressurE as the other orifices aforesaid, and thus producing a hollow frustoconical air jet converging to a point adjacent the outlet orifice of said nozzle.

Claim 2

Dependent Claim 131 words

Apparatus for atomizing paint or a similar liquid, which comprises a spray-gun of which the atomizing head incorporates a nozzle for the hydrostatic atomization of paint projecting a flat, fan-shaped jet of paint, at least two orifices disposed on either side of said nozzle for directing air jets onto said paint jet, means for feeding paint to said nozzle under a pressure of 10 to 100 bars and means for feeding compressed air to said orifices under a pressure of 0.5 to 2 bars, the atomizing head further comprisng an annular orifice concentric to said hydrostatic atomizing nozzle supplied with compressed air substantially under the same pressurE as the other orifices aforesaid, and thus producing a hollow frustoconical air jet converging to a point adjacent the outlet orifice of said nozzle.

Claim 3

Dependent Claim 35 words

Apparatus according to claim 1 comprising means for bringing said nozzle, made of conducting material, to a direct voltage of relatively high value in relation to the ground and to the objects to be painted.

Claim 4

Dependent Claim 49 words

Apparatus acccording to claim 1 in which the means to supplying paint to the nozzle of said atomizing head supply it under a pressure of 10 to 20 bars and the means for feeding compressed air to said orifices supply it under a pressure of 1.5 to 2 bars.

Claim 5

Dependent Claim 49 words

Apparatus according to claim 1 in which the means to supply paint to the nozzle of said atomizing head feed it under a pressure of 30 to 50 bars and the means for feeding compressed air to said orifices feed it under a pressure of 0.5 to 1 bar.

Claim 6

Dependent Claim 14 words

Apparatus according to claim 1 in which the annular orifice comprises local widened portions.

Claim 7

Dependent Claim 29 words

Apparatus according to claim 1 in which the annular orifice is the outlet of an annular passage bounded by two frustoconical surfaces formed coaxially to said hydrostatic atomizing nozzle.

Claim 8

Dependent Claim 87 words

Apparatus according to claim 1, in which the annular orifice is the outlet of an annular passage and the surface defining internally said annular passage comprises at least one fraction of the frustoconical lateral surface of the hydrostatic atomizing nozzle which merges continuously into the front, part-spherical surface of said nozzle which comprises its outlet orifice, the surface defining externally said annular passage consisting of an internal, frustoconical surface of one element of said atomizing head in which the other orifices supplied with compressed air are formed.

Claim 9

Dependent Claim 65 words

Apparatus according to claim 1, in which the two orifices provided for directing airjets onto said paint jet are disposed symmetrically in relation to the fan-shaped jet of paint, in the bissecting plane thereof, so that their air jets converge towards a first point of the axis of said hydrostatic atomizing nozzle which is coincident with, or adjacent to the outlet orifice of said nozzle.

Claim 10

Dependent Claim 110 words

Apparatus according to claim 1, in which the two orifices provided for directing air jets onto said paint jet are disposed symmetrically in relation to the fan-shaped jet of paint, in the bissecting plane thereof, so that their air jets converge towards a first point of the axis of said hydrostatic atomizing nozzle which is coincident with, or adjacent to the outlet orifice of said nozzle, and said atomizing head comprises about said annular orifice concentric to said atomizing nozzle a frustoconical surface so disposed as to deflect the air jets issuing from the other two orifices towards the aforesaid first point of the axis of said hydrostatic atomizing nozzle.

Claim 11

Dependent Claim 106 words

Apparatus according to claim 1, in which the two orifices provided for directing air jets onto said paint jet are disposed symmetrically in relation to the fan-shaped jet of paint, in the bissecting plane thereof, so that their air jets converge towards a first point of the axis of said hydrostatic atomizing nozzle which is coincident with, or adjacent to the outlet orifice of said nozzle, and said atomizing head comprises at least two other orifices so disposed as to direct convergent air jets towards a second point on the axis of said hydrostatic atomizing nozzle which is located downstream in relation to said first point.

Claim 12

Dependent Claim 92 words

Apparatus according to claim 1 in which the two orifices provided for directing air jets onto said paint jet are disposed symmetrically in relation to the fan-shaped jet of paint, in the bissecting plane thereof, so that their air jets converge towards a first point of the axis of said hydrostatic atomizing nozzle which is coincident with, or adjacent to the outlet orifice of said nozzle, and the frustoconical surface of nozzle and the annular member surrounding this nozzle deflect the two additional air jets bEfore they impringe on the paint jet.

Claim 13

Dependent Claim 153 words

Apparatus according to claim 1, in which the two orifices provided for directing air jets onto said paint jet are disposed symmetrically in relation to the fan-shaped jet of paint, in the bissecting plane thereof, so that their air jets converge towards a first point of the axis of said hydrostatic atomizing nozzle which is coincident with, or adjacent to the outlet orifice of said nozzle, and the frustoconical surface of nozzle and the annular member surrounding this nozzle deflect the two additional air jets before they impringe on the paint jet, and the free end of said annular member surrounding said nozzle projects externally of the central aperture of said air head and the two passages conveying said additional air jets are directed to converge towards said frustoconical nozzle surface and the annular member surrounding said nozzle, between said central aperture of the air head and the atomizing slot of said nozzle.

Claim 14

Dependent Claim 132 words

Apparatus according to claim 1 in which the atomized head further comprises at least one primary, needle-shaped electrode brought to the same electric voltage at the hydrostatic atomizing nozzle and disposed outside said flat jet of paint so that its tip be positioned close to one of the flat faces of said paint jet, at the level of the paint atomization front, or slightly downstream thereof, together with at least one insulated secondary electrode comprising a first blunted end registering with the tip of said primary electrode, on the opposite side of said flat paint jet, outside this jet but at a short distance therefrom, and a second pointed end relatively spaced from said paint jet so as to be directed preferentially ahead of the spray-gun towards the objects to be painted.

Claim 15

Dependent Claim 161 words

Apparatus according to claim 1 in which the atomized head further comprises at least one primary, needle-shaped electrode brought to the same electric voltage as the hydrostatic atomizing nozzle and disposed outside said flat jet of paint so that its tip be positioned close to one of the flat faces of said paint jet, at the level of the paint atomization front, or slightly downstream thereof, together with at least one insulated secondary electrode comprising a first blunted end registering with the tip of said primary electrode, on the opposite side of said flat paint jet, outside this jet but at a short distance therefrom, and a second pointed end relatively spaced from said paint jet so as to be directed preferentially ahead of the spray-gun towards the objects to be painted and in which the tip of said primary electrode and the first, blunted end of said secondary electrode are aligned at right angles to said flat jet of paint.

Claim 16

Dependent Claim 132 words

A spray-gun for atomizng paint or another similar liquid, which comprises a nozzle for the hydrostatic atomization adapted to project a flat, fan-like jet of liquid, and at least two orifices disposed on either side of said nozzle and symmetrically to said flat liquid jet in order to direct air jets in a plane at right angles to that of said flat liquid jet, wherein said nozzle comprises a front surface symmetrical in relation to the plane of said flat liquid jet and inclined towards the front and from the outside towards said flat liquid jet; said lateral orifices being so arranged as to project their air jets against said inclined nozzle surface whereby the said inclined nozzle surface will deflect said air jets into two sheets surrounding said flat liquid jet.

Claim 17

Dependent Claim 132 words

A spray-gun for atomizng paint or another similar liquid, which comprises a nozzle for the hydrostatic atomization adapted to project a flat, fan-like jet of liquid, and at least two orifices disposed on either side of said nozzle and symmetrically to said flat liquid jet in order to direct air jets in a plane at right angles to that of said flat liquid jet, wherein said nozzle comprises a front surface symmetrical in relation to the plane of said flat liquid jet and inclined towards the front and from the outside towards said flat liquid jet; said lateral orifices being so arranged as to project their air jets against said inclined nozzle surface whereby the said inclined nozzle surface will deflect said air jets into two sheets surrounding said flat liquid jet.

Claim 18

Dependent Claim 26 words

A spray-gun as set forth in claim 15, wherein the front surface of said nozzle against which said lateral orifice project their air jet is conical.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-09-22	1979-03-24	1979-09-23	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-09-22	1983-03-24	1983-09-23	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-09-22	1987-03-24	1987-09-23	$7700.00	Window Closed / Lapsed

Spray-gun apparatus for atomizing paint or similar liquids

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