US2545486A - Spraying device - Google Patents

Description

4 Sheets-Sheet 1 E. O. NORRIS SPRAYING DEVICE March 20, 1951 Filed Jan. 18, 1946 I VVE N TOR.

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/ TTOR IVE Y mu: [:JIIHU March 20, 1951 E. o. NORRIS SPRAYING DEVICE 4 Sheets-Sheet 2 Filed Jan. 18, 1946 I NVE N 7012.

\JIIIJQCIILJ March 20, 1951 E. 0. NORRIS SPRAYING DEVICE 4 Sheets-Sheet 3 Filed Jan. 18, 1946 .Ill.

INVENTOR.

ATTORNEY March 20, 1 951 E. O. NORRIS SPRAYING DEVICE I 4 Sheets-Sheet 4 Filed Jan. 18, 1946 INV E N TOR.

1! TTORNE 1 Patented Mar. 20, 1951 UNITED STATES PATENT OFFICE SPRAYING DEVICE Edward 0. Norris, Westport, Conn. Application January 18, 1946, Serial No. 641,929 14 Claims; (01. 299 ss This invention relates generally to spraying apparatus of the centrifugal type wherein a liquid is fed by suitable means to an atomizing distributor rotating at high speed, which receives, atomizes, and projects the liquid in a finely divided spray through a suitable opening in the apparatus, against the surface to be sprayed.

More specifically the invention relates to a portable centrifugal spraying apparatus f the so called all position type which is capable of being operated at any angle; the general object of the invention being to provide a device of this character which is simple, compact, light "and efiicient in operation and which is especially adapted for use by relatively unskilled operators.

Another object of the invention is to provide, in a device of this character, a small diameter rotary distributor having a relatively long axial face so as to improve the atomization of the liquid being sprayed.

Anotherwobject is to provide improved means for feeding the liquid to the distributor.

Another object of the invention is to provide, in an all position centrifugal spraying device, improved means for collecting and refeeding liquid to the distributor.

Still another objectof the invention is to provide, in a machine of this character, an improved cut off meansfor obtaining a sharp cut-off at the edges of the atomized spray and. preventing any,

Fig. 2 is a horizontal section taken on the line.

22 of Fig. 1 with the motor shown in plan;

Fig. 3 is a transverse section taken on the line 3-3 of Fig. 1 with the distributor in elevation Fig. ,4 is a transverse section taken on the lin 44 of Fig. l;

Fig. 5 is a transverse section taken on the line 5-5 of Fig.1; and 7 Fig. 6 is an enlarged central verticalsection through the atomizing distributor with parts in elevation. 7

My improved spraying apparatus comprises generally a rotating open ended collecting case, into which the liquid is forced under pressure, and a rotating atomizing distributor within the case which picks up the liquid, atomizes it and sprays it out through the open end of the case.

The collecting case and distributor are suitably supported by a housing within which is mounted a high speed motor and suitable gearing by which small high speed series type motor, having an armature shaft 2, is suitably mounted. The rear end of the housing I is closed by a removable cover 3, which when removed afiords access to.

the motor.

A handle 4 by which the device is held when in operation is rigidly secured to the under side of the housing I.

A gear casing 5 is secured to the forwardend of the motor housing I by bolts 5. Secured to and projecting forwardly from the face of the gear casing 5 is a tubular bearing stud I which is. disposed in axial alignment with "the armature:

shaft 2. A sleeve 8 having a spur gear 9 secured to the rear end thereof and a radially extending concentric circular ring I0 secured to the forward end thereof is rotatably mounted on the stud I and is retained thereon by a nut .II on the for ward end of the stud 1.

The gear. 9 meshes with a small pinion I2 formed on the projecting end of a shaft'l3 which is rotatably supported by the gear casing tend the front wall I4 of the motor housing I. Secured.

to the shaft I3 within the gear casing 5 is a spur gear I5. The gear I 5 mesheswith a smaller gear I6 rotatably mounted upon a short shaft I I which is also supported by the gear casing 5 and front wall I4 of the motor housing. The gear It in turn meshes with a small pinion I8 secured to' the-projecting end of the armature shaft 2. The sleeve 8 is rotated by the motor through this geartrain at a greatly reduced speed, the reduction being preferably in the proportion of 25 or 30 to 1. cured to the face of the gear casing 5 encloses the gear 9, pinion I2 and the sleeves.

A collecting case 28 is removably secured to the ring In in any suitable manner. herein the rear end of the collecting case 29 is permanently secured to a ring 2| which is threaded onto a, forwardly extending annular A split shield I9 which is removably se As shown flange 22 formed on the ring H3. The collecting case 20, which is circula in cross section, flares outwardly as indicated at 23, gradually increasing in diameter as it extends forwardly from the ring if! until it merges with a toric shaped trough 24. The portion 25, of the collecting case 29, forwardly of the trough 24 gradually decreases in diameter and terminates in a circular opening 25 at the forward end of the case.

A frusto conical ring 2'! is concentrically mounted within the section 25 of the collecting case 28, with its small end projecting through the opening 26 slightly beyond the forward. end of the case. ring 28 similar to but smaller than the ring 21 is concentrically mounted within the ring 2'? so as to provide an annular space 29 between the inner wall of the ring 21 and the outer wall of the ring 28. As shown in Fig. 1 the plane of the forward edge 3!? of the ring 28 is slightl to the rear of the plane of the forward edge st of the ring 21. Both the rings 2? and 28 are supported by a plurality of lugs 32 which are secured to and project inwardly from the inner wall of the portion 25 of the collecting case. A frusto conical splash guard or ring 33 is secured to the inner surface of the ring 28, with its large end in contact with the inner surface of the ring 28 and its small end projecting rearwardly within the case 20. The forward large edge of the splash guard 33 has a plurality of spaced notches 34 formed therein so as to provide a plurality of uninterrupted paths along the inner surface of the ring 28 between the forward and rearward edges thereof. A ring shaped open mesh screen 35 is also supported by the lugs 32 between the inner wall of the case 20 and the splash guard 33.

The atomizing distributor generally indicated by the numeral 36 is rotatably supported within the collecting case 20 by a hollow supporting tube 31. The axis of the distributor lies in a plane parallel to a vertical plane through the axis of the collecting case 26 as viewed in Fig. 2 and substantially perpendicular to a horizontal plane through the axis of the collecting case. The intake end of the distributor 36, when not spraying, is in close proximity to the annular trough 24 as shown in full lines in Figs. 1 and 3. When spraying the distributor is in the position shown in dotted lines in Figs. 1 and 3', with its open end dipping into the liquid in the trough 24 and facing toward. the peripherally advancing liquid to constitute a rotating scoop.

A pair of oppositely extending trunnions 38 are secured to the rear end of the supporting tube 3'5 and are rotatably mounted within the hollow bearing stud 1 toward the rear end thereof as indicated at 39. The supporting tube 3? extends forwardly, axially of the bearing stud 7, into the collecting case 20 and then curves to one side of the axis and then downwardly as shown in Figs. 1 and 2. The forward downwardly turned end of the supporting tube 31 carries a straight cylindrical tube 40 (Fig. 6) on which the distributor 36 is rotatably mounted.

The distributor 36 includes a frusto conical sleeve 4| which is secured to an axially disposed elongated cylindrical hub 42 by spiders 43. A plurality of spaced slightly dished atomizing and spraying discs 44 are secured about the enlarged end or crown of the conical sleeve 45 by a nut 45 which is threaded on a boss 45a formed on the sleeve 4|. These discs 44 are assembled and held in their proper spaced relation to each other by rivets 46 and spacers 41. The enlargedend or A cut-off flange comprising a conical 4 crown of the sleeve 4! is toothed as indicated at 48, the base of the teeth being in line with the upper face of the lowermost disc 44 as viewed in Fig. 6, and the points of the teeth being flared over the upper disc 44.

The hub 42 is mounted upon the hollow tube 40 and is held in position thereon by a collar 49, on the supporting tube 31, and a cap 5% secured by a screw 55 on the projecting squared end 52 of a short shaft 53 rotatably mounted within the hollow tube 4! A projecting lug 54 on the end of the hub 42 engages a complementary notch in the cap 50 to drive the distributor in unison with the shaft 53. The numeral 55 indicates a packing ring or seal between the end of the hub 42 and the collar 49. The shaft 53 is connected to the armature shaft 2 by a flexible shaft 5311 which extends through the hollow supporting tube 31.

The construction of the distributor 35 is such that in operation it will throw out or spray a band of finely atomized liquid around the entire periphery-of the discs 44. The liquid leaves the discs 44 tangentially, and. the thickness of the sprayed band is substantially equal to the distance between the uppermost and lowermost distributor discs 44 as indicated in Fig. 1. Part of this band of spray will be projected out through the opening 2i in a segment which gradually increases in width after leaving the ring 28, as indicated in Fig. 2. Thebalance of the band of spray is intercepted by the inner wall of the case 20 by which it is collected and returned to the distributor for re-spraying. To secure the most efficient results the band of spray leaving the ring 28 should be substantially symmetrical about the extended axis of the collecting case 29. In order to accomplish. this it is essential that the dimensions of the principal parts of the distributor 35 have a definite relation to the dimensions of the collecting case 28. The position of the axis of the distributor is determined by the diameter of the atomizing discs 44. The periphery of the discs 44 should be tangent to a plane through the axis of, the distributor, and the length of the sleeve 48 should be such that the small intake end thereof dips into the trough 24 during operation with the discs 44 in position to project a band of spray out through the ring Elias described.

The tube 37 has a flanged collar 56 (Fig. 6) rigidly secured thereto within the case 25. A. ring 51 having a peripheral groove 58 is rotatably mounted upon the collar 58. The ring ill, to which the case 29 is secured, is formed with a forwardly projecting annular flange 59 having a peripheral groove 69. One end of a flexible boot 6| is secured to the ring Why a spring clamp 52 which cooperates with the groove 58, and the other end of the boot 6! is secured to the flange 59 by a spring clamp 63 which cooperates with the groove 68. The. boot 6! functions as a. seal between the case. 25. and the interior of the bearing stud i to prevent anyv liquid from passing back through the hollow stud i into the gear casing Or motor.

An arm 64 (Figs. 1 and 4) is secured to the rear end of thesupporting tube 31 adjacent the trunnion 38. This arm 64 extends rearwardly from the end of the tube 3-! into the gear casing 5' and then outwardly toward the wall of the gear casing. The free end of the arm 64 is bifurcated as indicatedatfifi and straddles a reciprocally mounted rod- 66 between a collar 61 thereon. and a compression spring 68 seated against the wall l4. The spring fiai normally biases the support- 'ing-tube 31 and the distributor 36 carried thereby to the inoperative position, shown in full lines in FigsLl and 3; The rod 66 projects through the front wall of the gear casing 5 into engagement with a trigger 69 pivoted at to a lug on the gear casing The trigger 69, which is somewhat flexthe collecting case 20. The liquid is forced,

usually by air pressure, from a suitable container through a flexible hose I4 to the valve 13. After passing the valve 73 the liquid flows through an upwardly and an outwardly extending conduit in the handle 4, and thence through a tube 16, the end ll of which is turned back upon itself and extends into the, collecting case through the open forward end 26 adjacent the outer surface of the ring 27.

The lever 12, which is positioned in a slot 18 in the handle 4 in such a manner that the operators hand will not engage it when he gripsthe handle 4, is pivoted at its lower end to a lug 19 on the casing of the valve 13. A set screw 30 which .extends through a tapped hole in the lever 12 in alignment with the valve stem 8|, constitutes an adjustable abutment by which the valve is opened and closed as the lever 72 is rocked on its pivot.

In operation the operator holds thedevice by the handle 4 with his forefinger around the trigger 69. The motor is energized, by means of a suitable switch not shown, to drive the collecting case at a speed of 400 to. 600 revolutions per minute and the distributor at a speed of about 12,000 revolutions per minute. The direction of rotation of the collector case 2%) and the distributor 36 is indicated by arrows in Fig, 3. The trigger 69 is then pulled toward the curved end H of the lever 12 to shift the distributor 36 from the inoperative position, shown in full lines in Figs. 1 and 3, to the operative position, shown in dotted lines in Figs. 1 and 3. Inthe operative position the intake end of the sleeve 4| of the distributor projects into the trough 2 3 as is clearly shown by the dotted lines in Fig. 3. Further pressure on the flexible end of the trigger 69 will bring it into engagement with the forwardly extending curved end H of the lever 12 to rock the. lever 12 on its pivot and open the valve 13. This will permit liquid to be forced under pressure from the storage receptacle through the ible below the point of engagement with the rod flexible hose T4, conduit 15 and tube Hi into the collecting case 20. Due to the particular shape of the case- 20 and to the centrifugal action caused by therotation of the case the liquid will flow into the trough 24 filling it to the dot and dash lines marked A in Fig. l. The liquid will be carried around in the trough as it rotates and will be forced by its inertia into and scooped up by the intake end of the sleeve 4| of the distributor. The rotation and shape of the distributor sleeve and the inertia of the liquid will cause the liquid to flow along the inner surface of the sleeve 4! to the teeth 48 at the upper end thereof where it will be thrown outwardly between the teeth 48, by centrifugal force, onto the discs 44. The discs 44, due to their high speed of rotation, will throw or spray the liquid outwardly tangentially thereof in a finely divided viously stated part of this spray will be projected through theopen end 26 of the case 20. The

balance of the spray will be collected by the inner wall of the case and will be returned to the trough 24 for re-spraying. Part of the spray will strike the inner rearwardly flaring wall of the ring 28. Any liquid reaching the forward edge 30 of the cut-off flange will be thrown radially outwardly therefrom against the inner wall of the ring 21 and returned centrifugally tothe case 20. The balance of the liquid striking the wall of the ring 28 will be returned centrifugally thru the notches 34 in the splash guard 33 into the case 20.

It is to be understood that this apparatus is v adapted for paint spraying and also for atomizing and spraying other spray forming materials, such as liquid disinfectants.

From the foregoing it will be apparent to those skilled in this art that I have provided a simple and eflicient mechanism for carrying out the objects of my invention. It is to be understood that my invention is not limited to the specific construction shown and described herein as various modifications can be made therein within the scope of the appended claims.

What is claimed is:

1. In a portable spraying apparatus the combination of a rotary case, means for supplying a spray forming material to said case, an opening in said case, a distributor operative to project a band of said material in spray form through said opening, said distributor comprising a tubular support pivotally supported adjacent one end I thereof exteriorly of said casing and extending into said casing, a bearing stud having a longitudinal bore therethrough secured to the free end of said tubular support, a shaft rotatably mounted within said bearing stud, means for rotating said shaft, a hub rotatably mounted upon said bearing stud, a driving connection between said shaft and said hub, a fri1sto-conical sleeve rigidly secured to said hub, serrations about the large end of said sleeve, a plurality of spaced discs rigidly secured to said sleeve about the serrated end thereof, and means for oscillating said tubular support.

2. A spraying device comprising a rotary case having an axial spray opening and a concave peripheral wall forming an annular channel to retain a spray forming material, driving means for rotating said case to form a peripheral film of said'material in said channel, a rotary distributor mounted within said case having an annular spray discharge portion and having means to feed the material from said channel to said discharge portion, said means including a rotating part of said distributor having a surface projeetinginto the material in said channel and facing the advancing material in said channel toscoop up a supplyv of said material therefrom, said annular spray discharge portion lying in a plane intersecting said opening whereby a portion of the spray from said distributor passes through said opening and the remainder thereof is intercepted by said case and returned to said channel.

3. In a spraying device as set forth in claim 2, a tube supporting said distributor, means supporting an end of said tube externally of said case, a drive shaft for said distributor extending through said tube, and means shifting said tube to bring said rotating part into or out of said channel.

4. In a spraying device as set forth in claim 2, a control valve to control the admission of said material to said case, means including a control lever connected to shift said rotary part into or out of the film of material in said channel, and means actuated by said control lever to actuate said valve.

5. In a spraying device as set forth in claim 4 a lost motion connection between said lever and said valve, said lost motion connection being so arranged that a limited movement of said lever controls the position of said rotary part and a further movement thereof actuates said valve.

6. In a spraying device as set forth in claim 5, a tube supporting said distributor and having an end pivotally supported externally of said case, a drive shaft for said distributor extending through said tube, and means shifting said tube about its pivot to bring the intake end of said sleeve into or out of said film of material in said channel.

7. A spraying device as set forth in claim 6 in which said case is mounted to rotate about a hollow stud, the tube extends through said stud and a fiexi. 1e boot extends between said tube and said stud to seal the opening to said stud.

8'. A spraying device comprising a rotary case having an axial spray opening and a concave peripheral wall forming an annular channel to retain a spray forming material, driving means for rotating said case to form a peripheral film of said material in said channel, a rotary distributor disposed within said case comprising a frusto conical feed sleeve having an open small end positioned to dip in said film of material in said channel, said open end facing toward the peripherally advancing film in said channel to scoop up a supply of said material, means for rotating said sleeve to feed the scooped up material centrifugally along its fiaring inner surface and to discharge the same centrifugall from an annular discharge portion at its large end, a distributor disc extending around said sleeve at said discharge portion to receive the material therefrom, and means for rotating said disc to discharge the material therefrom centrifugally in a band of spray, said disc lying in a plane intercepting said opening whereby a segment of said spray band passes through said opening and the remainder thereof is intercepted by said case and returned to said channel.

9. A spraying device as set forthin claim 8 in which said disc is rigidly attached. to said feed sleeve to rotate therewith.

10. A spraying device as set forth in claim 8 in which said disc is driven at the same speed as said feed sleeve.

11. A spraying device as set forth in claim 8 in which said feed sleeve is provided with an inclined discharge edge extending across said discharge portion and a plurality of distributor discs are spaced along said portion to receive said material from said edge.

12. In a spraying apparatus the combination of a concave rotary case, means for supplying a spray forming material to said case, an opening in said case, a rotary distributor mounted in said case and positioned to project a band of said material in the form of a spray through said opening, said distributorcomprising a tubular support pivotally supported adjacent one end thereof exteriorly of said case and extending into said case, a bearing stud having a longitudinal bore therethrough secured to the other end of said tubular support, a shaft rotatably mounted within said bearing stud, a drive shaft extending through said tubular support for rotating said first shaft, a hub rotatably, mounted upon said bearing stud, a driving connection between said first shaft and said hub, a frusto-conical sleeve carried by said hub, a discharge portion at the large end of said sleeve, a plurality of spaced discs disposed about said sleeve at said discharge portion, and means for shifting said tubular sup* port to bring said sleeve into or out of feeding relation to the material in said case.

13; A spraying device comprising a rotary case having an axial spray opening and a concave peripheral wall forming an. annular channel to receive a spray forming material, driving means for rotating said case to form a peripheral film of said material in said channel, a rotary distributor mounted within said case comprising a frusto conical feed sleeve having an open small end positioned to dip into said film of material in said channel, said distributor having. an annular spray discharge portion at its large end, said open end facing toward the peripherally advancing material in said channel to scoop up a supply of said material from said channel, means. for rotating said sleeve to. feed the scooped up material centrifugally along its flaring inner surface and to discharge the same centrifugally from said discharge portion, said discharge portion lying in a plane intersecting said opening whereby a portion'oi the spray passes through said opening and the'remainder thereof is intercepted' by said case and returned to said channel.

14. In a spraying device as set forth in claim 13, means mounting said feed sleeve to shift into or out of feeding position with respect to said film and a control member connected to shift said feed sleeve.

EDWARD O. NORRIS.

REFERENCES CITED The following references are of record in'the' file of this patent:

UNITED STATES PATENTS Number Name Date 7 1,483,461 Littleton, Jr. Feb. 1-2, 1924 1,667,745 Smellie May 1-, I928 1,828,463 Hammers Oct. 20; 193-1 1,957,316 Buckley et-a'l. May" 1-, 1934" 2,053,647 White Sept. 8', 1936 2,063,048 Norris Dec. 8, 1936 2,099,988 Norris NoV.- 23, 193-7 2,157,416 Kjos May 9, 1939 2,185,495 Bond Jan. 2, 1940 2,233,855 Suss Mar, 4, 1941 2,256,080 Eweryd' et al Sept; 16; 1941

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