US1739428A - Spray head - Google Patents

Description

Dec. 10, 1929.

R. w. TRACY 1,739,428

SPRAY HEAD Filed Jan. 2.7. 1.928

Fig.1 Y

Patented .Dec. 10, 1929 UNITED STATES PATENT" OFFICE ROBERT W..TRAC'Y, OF TOLEDO, OHIO, ASSIGNOR TO THE DE V'ILIBISS COMPANY, OF

TOLEDO, OHIO, A CORPORATION OF OHIO SPRAY HEAD Application filed January 27, 1928. SeriaI No. 249,814.

This invention relates to spray-heads for use particularly in connection with spraying devices for applying materials 1n spray form to surfaces to be coated.

6 In devices of this character it is custom ary to discharge supplemental air jets against opposite sides of the main surface coating spray stream to effect a flattenlng and broadening thereof, or to create what is commonly referred to as a fan spray. In the use of such supplemental air jets it is found desirable to regulate the volume of discharge of air from the sup lemental passages and thereby control the attening action of the air ets on the main stream to suit the particular material being sprayed or the particular job in hand. 7

The object of this invention is the provision ina spray-hand of this character of simple, efiicient and novel means for completely shutting off or controlling the volume of discharge of air fromthe supplemental air discharge passages, the adjustment of such means being effected by a relative turning of the inner and outer nozzles of the spray-head.

The invention is fully described in the -fol lowing specificati0n,gand one embodiment.

thereof illustrated in the drawings, in which,-

Figure 1 is a side elevation of 'aspray-head embodying the invention with a part 1n central longitudinal section. Fig. 2 is a crosssection thereof on the line 22 in Fig. 1 and Fig. 3 is a perspective view of the valve member removed from the spray-head.

Referring to the drawings, 1 designates I the portion of a spray-gun body to which the spray-head-is attached and which with the spray-head, in the present'instance, may be considered as the spray-head unit, inasmuch as it is detachable as a unit from the spray-gun body proper. The assembled con- ,nection with a spray-gun body of such a unit equipped with a different construction of accompanying spray-head is illustrated in U. S. Letters Patent N0.'1,613,5 88, dated J an. 4, 1927.

The body member 1 is provided at its forward end with an enlargement 2, which, in

the present instance, has its forward end v portion externally threaded to permit the ing of the nozzle relative to the body member.

engagement with therewith of a union nut 3. The body 2 has an axially disposed bore or passage 4 therein for communicating through a nipple 5 and any suitable connection with a' source of supply of the material to be sprayed.

The inner or material discharge nozzle 6 of the spray-head is threaded into an enlarged portion of the forward end of the bore 4 and has its forward end reduced and terminating in a restricted discharge nipple 7 with its discharge passage in communication with the bore 4, as well understood in the art. The nozzle 6 intermediate its ends is provided with an annular flange or radial enlargement 8 which has a gasket'seat 9 against the forward end of the body enlargement 2. The flange 8 also provides an annular internal tapered seat 10. The nozzle 6 between its forward reduced end portion and the flange 8 is provided with a hexagonal wrench-engaging portion 11.

The outer or air discharge nozzle 12 is of cup form, having the cylindricalcavity or air space 13 in its rear end portion and having its forward end provided with a centrally disposed air discharge orifice 14 through which the nipple 7 centrally projects in spaced relation thereto. The rear end of the outer nozzle 12 is formed-with an annular rearwardly projecting flange-like extension 15 forming, in the present instance, an extension of the 'wall portion of the air space 13 and adapted to seat against the conical seat 10 of the flange 8 of the inner' nozzle. The union nut 3 coacts with a peripheral flange 16 on the nozzle 12 to hold the nozzle to its seat against the enlargement 8 in a manner to permit a. turn- When the nozzles 6 and 12 are assembled, the air space or chamber 13 is formed by the nozzle 12 and a portion of the nozzle 6 surrounded thereby, and has communication at its forward end with the air discharge orifice 14 and at its rear end through one or more passages 17 in the flange 8 with an annular chamber 18 in the body enlargement 2, which in turn has communication with a source of air pressure supply through a pas- 0 sage 19 in sa1d enlargement. 1 o

,' passages 22, therefore,

An annular air chamber 20 is provided between-the body enlargement'2 and nozzle 12 and the flanges 8 and on the inner side and the union nut 3 on the outer side. The outer nozzle 12 has therein the diametrically opposed supjplemental air discharge passages 21 which are in communication at their rear ends with the-"chamber and have their outer ends disposed to direct their streams of air into opposed flattening engagement with the main material laden stream issuing from the central orifices of the two nozzles.

The flange 15 has one or more passages 22 therein opening communication between the chambers 13 and 20 and being of a size to furnish a predetermined volume of air supply sectional area of the passages 22 is determined by the particular job in hand, several nozzles 12 with passages 22 of various capacities being supplied with a spray-gun so that any one may be used, depending on the requirements.

The" supply of air under pressure to the chamber 20 through the passages 22 is controlled by a ring valve 23 which rotatablyfits within the cylindrical chamber portion 13 of the nozzle 12 and is split, in the present instance, to adapt it to have releasable closefitting engagement within said nozzle. The valve is provided around its periphery with a plurality of cut-away portions, leaving a series of pad-like portions 24 in spaced relation around the periphery of the ring adapted by a turning of the valve to be brought into or out of register with the passages 22. It is apparent that the number and spacing of the pads 24 depends on the number'and spacing of thepassages 22 so as to facilitate a closing or opening of such passages at various points in a turnin movement of the nozzle 12 on the nozzle 8. or instance, when using the fan spray feature it may be desirable to have the main stream flattened in a horizontal or a vertical lane, and this is accomplished by turning t enozzle 12 so that its supplemental air discharge passages 21 are'both disposed in one or the other of said planes. The disposition of the valve pads 24 with respect to the should be such as to permit the dischar e of air from the supplemental passages w an the outer nozzle 12 is in either of said operative positions, and at the same time should permit a closing register of the pads with the passages 22'when the outer nozzle 12 had beenturned a short distance in either direction from said operative positions for the fan spray.

The inner portion of t e ring valve 23 is 1 sage provide fashioned to engage the surface 11 of the nozzle 6 so as to prevent any considerable turning of the valve on such nozzle and at the same time permit the passage of air past the valve throu h the forward end portion of the air cham er 13. It is apparent that the outer nozzle 12 may have a turning movement on the valve member to bring the pasor passages 22, as the case may be, into register with certain of the valve pads to efiect a closing of such passages.

I wish it understood that my invention is not limited to any'specific construction, arrangement or form of the arts, as it is capable of numerous modifications and chan es without departing from the spirit of the c aims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is a 1.- In a spray-head of the class described, inner and outer nozzles mounted for relative rotary adjustment and the outer nozzle having supplemental air discharge passages, the nozzles being of different sizes to a space therebetween in communication with asource of air pressure supply, means cooperating with the outer nozzle to form a "second space in communication with said discharge passages, said spaces having restricted communication of predetermined area with each other, and means in said first space operable by a relative turning of the nozzles to efiect an opening or closing of said restricted communication.

- 2. In a spray-head of rotary ad'ustment and the outer nozzle having supp emental air dischar e passages, said spray-head having spaced 0 ambers, one space being in lemental discharge passages and the other 1n communication with a source of air pressure supply, said chambers having restricted communication of predetermined area with each other, and means operable by a relative turning of the nozzles to efiect an opening or closing of said restricted communication at various points in the relative turning of the nozzles.

3. In a spray-head of the class described, an. inner nozzle, a stationa part forming an annular seat in surroun 'ng relation to and at the rear of the discharge end of said nozzle, an outer nozzle. seating against said stationary part for rotary movements relative to it and the inner nozzle and forming with the inner nozzle an air space having the class described, inner and outer nozzles mounted for relative communication with the supsages betweensaid spaces, the combined cross- 'sectional area of which bears a predetermined relation to the combined cross-sec- 'tional area. of the said supplemental passages, and valve meansin the space between said nozzles adapted to close said restricted communicating passages when the outer nozzle is in various rotary adjustment positions on the valve.

4. In a spray-head of the class described,

an inner nozzle, a seat surrounding and stationary with respect to said'nozzle, an outer nozzle having annular rearward extension bearing against said seat and having supplemental air discharge passages without said e'irtension, said outer nozzle forming a space around the inner nozzle adapted to have communication with a source of air ressure supply, means rotatably holding t e outer nozzle to its seat, said outer nozzle having communication therethrough between said passages and space bearing a predetermined relation as to size to said supplemental discharge passages, and a. valve mounted in said space and ada ted-to close the communication between sai space and passages when the outer nozzle is in a predetermined position of rotary adjustment relative to the valve. 1

In testimony whereof I have hereunto signed my name to this cation.

' ROBE T W. TRACY.

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