US 1642418 A
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sept.' 13, 1921. 1,642,418
. L. P. KOVANDA ET AL" l l uoLTEN MATERIAL snAINe A1Filmli'lisf"'ffl v Filed Oct. 1.- 1925 Patented Slept. 13,1927.
' UNITED sTATLE-s LOUIS P. K OVANDA AND JAY H. HUBBLL, -OF LOS ANGELES, CALIFORNIA; SAID HUBBELL ABSIGNOB T AID KOVANDA.
Application filed October 1, 1925. Serial No. 59,821.
The present invention relates to apparatus and methods for spraying or otherwise apn p1 ing materials which must be applied wli'en in a heated state to form protective or 5 other coatings for various surfaces or structures, such as tanks, sewers, walls, oors, pipes, columns, Statuary and the llke.
` The invention has for its principal ob]ect, the provision of apparatus for propllrly applying coatings of t e requisite thlc ess, of Various materials and compounds which can only ,be 4properly applied in a heated condif' tion.
` Another object of the inventionis to provide ap aratus for 'so applying compounds of sul lihr in one or'more coatlngs. of the desir thickness. Another object of the in vention 1s to provide aplparatus for` applymg a variety of ao materia such as tars, asphaltums,' waxes,
- pitches, sulphur andcom as well as other materia and compounds which must vbe applied in a heated condition.
Anotherob'ect ofthe invention'is to proal vide im rove air-spray apparatus f or any -of thea ove mentioned materials, which apparatus is capable of keeping all of themate- `rial throughout the apparatus, at a practically constant redetermined `temperature in order 'to provi e the proper fluidity.`
' Still another object of the invention 1s to provide a'n apparatus of the air-spray type, which will handle the above mentioned materials continuousl without clogging -the ports, valves, no es, etc.,vsuch as are required in apparatus of the character described..V j
We have found that .the materials mentioned,especia1ly sulphur compounds, are
l 4o best ap lied when splrayed upon a surface in a globu ar state, rat er than in a finely neblullze'd state, and it is 4another object of our Y -invention to provide apparatus to forcibly deliver the materials in the correct'state of- 4| subdivision.
'Still other objects and advantages of our" invention will appear hereinafter. We have illustrated, by the accompanying drawings, one practical embodlment of our I 4invention which is' adapted for carrying out v ofv our improved methods of applymg mate Inthe said drawing:
` rials of the character. attentional.
is'Yaviewpartiallyl in unds of sulphur,-
partially in elevation, 'of said embodiment of our inventlon- Fig. 2 1s an enlarged detail cross section of that part of the apparatus hereinafterknown as the nozzle.
Incarrying out our invention, by the use of the embodiment illustrated, or by any other embodiment, we provide for maintaining a heated reservoir of the material so thatl a dependable source of supply is had.
The material in the reservoir is maintained at apredetermined or regulable temperature so that the material which is. about to be applied to a surface or the like is in the desired state of fluidity. We also provide a suitable nozzle. Air spray nozzles of the force feed or gravity feed type may be employed, or any other type of nozzle, such as a single or multiple jet, or single or multiple slot, nozzle or any other suitable-distributmg or material applying means.
Other means for throwingthe materials forcibly against a surface Vin a properly subv staled.
n conformance with a salient 'feature of our invention, we maintain a hot fluid envelope over all partsincludin the reservoir,- hose,valves, nozzle and event e extreme outlet end of the nozzle, if desired. The'fluid envelope may be steam, hot oil or the like in `which control valve or valves may be in-l circulation, hot air, or an electrically or otherwise heated atmosphere whlch is 1solated, or' insulated from the extraneous atmosp'here. 'e
In the specific embodiment illustrated, the
rreservoir-is indicated-at 5, the nozzle 6, -and the hose 7, which 'conveys the material to the nozzle, at 7. HoseV 7 in' this instance is employed so that reservoir may bestationas:v
ary at times while the nozzle vis freely moved.
The reservoir holds alarge supply of the material, andthe hose enters thebottom of .the reservoir as at 9. A screen 10, where the nature of the material requires it, is placed over the inlet end olf the hose. The reservoir iis fitted with a pressure pipe 11 whichkeeps the contents., under a Agiven air'- pressure," as
indicated by the pressure gauge 12. Such air-'pressure will force the material steadilythrough the hose, although in some instances gravity may be depended upon. 'The reservoir is maintained in a heated atmosphere by being practically enclosed in a steam jacket 14 having an interior steam filled space 14.- The hose 7 leads 'directly from they reservoir to nozzle, but is not insulated from the steam. In fact, the entire length of the hose is caused to be enveloped by steam by placing a jacketing the material-conveying hose. Said jacketing hose is in fluid communication with the steam space of the steam jacket.
The nozzle includes a spray nozzlebodyvBa and a steam jacket 8b. The Ksteam jacket provides a steam space 141 which is in coininunication with the space 14ea at all times by means of the jacketing hose. The nozzle jacket is extendedforward to the discharge orifice of the nozzle so that the material forced from the reservoir and out of the discharge orifice is subjected to the heat of the steam throughout its entire course and all material-containing, and material-conveying parts are kept at the desired temper- Y ature.
The nozzle body includes a tube 16 that ends in an orifice 17 and said tube is connected directly to the inner hose,'as by the valve 18. Said valve may be of any suitable type and is intended primarily to rovide for shutting off, or throttling the ow of material.
The air ressure in the reservoir will force the now uidmateral. out of the tube 16, at a constant rate. The iorwardend of the tube is inserted in an air-conveyin body 2O having aconical bore 21 from whic the discharge orifice continues outwardly. The
4 dischar e end of the tube extends into the conical re 21 and is set back suitably from the discharge orice. The body 20 is provided with an annularV 'cavity 23. Air under suitable pressure is supplied to the .cavity by a line 24 whichpasses directly through the space in the nozzle jacket, and through a p 25 to connect with an air hose 26 externa ly of the nozzle. -Even the air passing to the nozzle becomes heated by nflovving through the line 24and the heated nozzle -roin 'cavity 23 4small ducts 27 lead into the conical cavity. The jacketing hose is Iheldl to the nozzle jacket yby' means. of a vof condensation by a plug 29.
pupling'28 and thejacket may drained The valve which controls flow'through the inner hose includes `'a stein 30 which passes out of the jacket through a stuing box 31 to j terminate inz a disc82 operable externally of thenozzle so thatthe operator li'as control over the ow of material,-
` In theoperation o f the'apparatus, steam hose 15 over.
is admitted to the steam jacket and surrounds all material containing parts, as described. Air under pressure is admitted to the reservoir. When the material has attained fiuidity, the valves are manipulated to give the correct amount oi' air and material. As the material is cxtru led into the conical bore, -it is picked up by the air stream flowing from the ducts out through the discharge' orifice. The arrangement of' the nozzle parts is such,'that when the valves are properly set, the material is broken up into a, comparatively coarse spray, the material emerging from the discharge orifice lin the form of globules of a size that ,We have found to be Well suited, particularly for-l causing sulphur compounds to distribute rapidly and evenly over the surfaces requiring protection.
It will be apparent novy that our invention provides methods and apparatus for applying protective, and other coatings, of the character described, to surfaces requiring such coatings, and while we have'mentioned certain specific steps in carrying out our in vention and have specified certain constriic- 1. In a molten material spraying apparal tus, a reservoir adapted to contain molten material, a nozzle, a molten material-conve ing line connecting said reservoir and nozz e, and connected heatin jackets surrounding said reservoir, line an nozzle res tively.-
2. In a molten material spraym apparatus, a reservoir adapted to contain molten material, a nozzle, a molten material-conveying line connecting said reservoir and nozzle,
and steam jackets .surrounding said reservoir, line and nozzle respectively; said jackets being connected to provide a continuous jacketing space. i
3. In a molten material spraying apparamaterial, a conduit leading from 'said reservoir, a nozzle connected to said conduit, a heating jacket for said reservoir, a heating jacket for lsaid nozzle, and a conduit jacketing member leadin from the first mentioned jacket to the secon mentioned jacket.
4. In a molten material spraying apparatus, a. reservoir adapted to contain molten material, a conduit leadlng from said reservoir, a nozzle connected to said conduit, a
heating jacket for said reservoir, a heating jacket for' said nozzle, and a. jacketin member leading from the first mention jacket to the second mentioned jacket: said conduit tus, a reservoir adapted to contain molten f lbeing disposed within said jacketing mem- 5. In vapparatusof the class deseribeda reservoir adapted tov contain molten4 material, a steam jacket for said reservoir, a flexible conduit leading from said reservoir through said steam jacket, a tube at the ena of said iexible conduit, said tube having a discharge end, an air-conveying body' pro` viding an air space around the discharge end of said tube, and further, having a discharge orifice leading outwardly from said space, a.
.jacket providing a space surrounding said tube and body, the space and orifice of said body being isolated'vfrom said jacket space, a jacketin'g member enveloping the rst named conduit and leading from the steamA jacket to the space surrounding said tube and body, and an air fluid pressure line lead- 'ing from points externally" of the nozzle zle connected to said duct and a heating jacket enclosing said duct, nozzle and source of supply. y
7. In a molten material handling and v spraying apparat-us, a source of molten material supply, a duct leading therefrom, a nozzle connected'to said duct, aheating jacket enclosing said duct, e nozzle and source of supply and fluid pressure means leading to sal nozzle. e
In testimony Whereor` We aiiix our signa-A tures. l
Louis P. KovANnA. JAY H. HUBLBELL.l