US1475372A - Apparatus for applying coating - Google Patents

Description

v//////////// m \\\\\\\\\x H. w. DAY

- APPARATUS FOR APPLYING'COATING :Filed Mrch 1, 1922 i Iliff/1111111 "U-WEDSife-ree nnmainnr w. DAY, or wonnas'ron, aiassaoiaUsn'rrs-assrenonmo SPRAY-mismanamGr COMYANY, F BOSTON, .MASS'GH'USEILJIS,l A CORQPOBA'EIQN- 0F MASSACHUSETTS.

l -arrana'rns ron eran-irrite eparina.-

.appucaaon mea irma 1, ieee. 'serial-no. 540,170.

To all whom imag concern.'

Be it known that l, HERBERTNV. DAY, a citizen of the United Statesfand a resident of Wollaston, in the county of Norfolk and'State'of-Massachusetta have invented an Improvement in "Apparatus forApply-j ing Coating, of which the following description, in connection with the accompanying' drawings, isa specification, like characters on the drawings representing like parte. 1 l

This invention relates to apparatus for applying coating to surfaces. The-coating, if 'a liquid, may bea paint, japan, varnishor any other suitable coating medium,.or it may, if desired, be a solid ,in powdered form, and the material or surface -to which it is to be applied may Vbe'of any-character, such, for example, as

- -Wood", metal or other material.

V Referring more particularly to the draw- "f *"in'g, wherein I have represented a; single embodiment of my invention,

. Fig. 1 is a vertical longitudinal Section.v

of a tool constructed in accordance' with my invention;'

Fig` 2 is a vertical longitudinal section of the discharge end 'of the tool, but representing the parts positioned to vcut ofthe a0 discharge of the motive agent supplementally; vand Y Fig. 3 is an end elevation of a tool look ing towardthe right in Fig. 1.

- The tool or4 appliance may '35' suitable 'material but is preferably metallic and may'. be of the general form shown in my Patent No. 1,172,233, -dated February 15, 1916, or of any other suitable form or construction. The .body'l is, however, pref-l o erably provided with a handle or extension` 2 integral therewith and provided with a guard 3 inclosing the free end of the .valve operating lever 4 pivoted at 5 upon thebody 1. In the disclosed form of the inaa'vention,l the said operating leverr. is of general ti'iggeriorm but such construction may be widely varied within the scopeand `purpose of the invention.

The handle 2 is provided with al passage 6 5o for the paintl or other suitable coating liquid or powder, which may be supplie through gravity or under suitable pressure if desired andalso with a' passage 7 for the` air or other suitable fluid 'under pressure.

In the form of tool hereinshown, l'have represented the `passages 6,7 as pipes suitably secured in the body Land as-cominu- Parana?? nicating attheirinner "ends-with passa es.A

'8, 9 cored or otherwise suitably provi ed in the body 1. Controlling -thelpaintsupply passage 8 is a valve which may be of any suitable forni, but vwhich-'is herein rep- .resented as, an' axially movable piston orv plunger 10' positioned 'within a valve casing 11 and having a stem 12'extending through the valve casing into Contact with the operating lever 4,- as clearly shown Fig. 1.` The valve here shown as a pistonv or plunger is normally held seated by acoiled spring 13 surrounding the stem 12 and seated in a recess 14 in a cap .15 threaded at 16 into the bodyl similarly threaded The passage 9 for" the air is controlled by a similar valve indicated generally at. 18 1n Fig. 2, the spindle19 thereof 'contacting with the valve operatinglever el which is shaped so as to engage both valves in a manner herein nnnecessarymore fully to illustrate. The body 1 is cored toprovide a longitively of a tubular member 23 threaded at 24 and a needle valve 25 threaded at 26. The tubular member 23 at its forward end passage of the coatingmaterial issuing from the valve chamber. 10 into the passage 27 `and thence into the circumferential space forward end of thesaid needle' valve is guided Vand positioned by any suitable lmeans', as, for-example, byA acoiled wire 31 encircling `the head of the v alve and maintaining' it in a' central pasaron when `tudinal passage 20 which is internally .threaded at 21, 22 for'the reception respecis preferably suitably formed to permit the b e 'of any is `preferably ioc needle valve 25 isnseatediat its-.outer end of the cap 30 as' indicated in Fig. 1,: and the' 13 and extending'from suchA valve chamber lis an air passage 34 indicated indotted'lines in Fig. 1 andcommunicating with 'a passage 3'5. forming an enlargement ofthe passage -36 ofthe tubular member 20. When the erned or controlled by the needle valve 25.'

valve 18 isopened, the airflows through the passage '.33 past the vvalve 18 through the passages 34, 35, and into the passage 36 gov- Upon the outer end of the lbody 1 is threaded or otherwise suitably Asecuredv a preferably cap-like member 37 herein shown as having a concaved or curved inner s urface 38 and a small central opening 39 in l .line with the aXis of the. needleA valve 25.

z The length of the ithreaded portion 40 of the cap like member is suiiicient to per-Y rmit adjustment of the member 37 so as to provide for the effective formationof a film and the variation ofthe thickness thereof, f as described in my Patent No. 1,172,233. Such film is -constantly. formedand maintained 'by' capillary action between .the sur! face '38 .and the outer surface 41.-of the inner ca p 30 vwhich are brought close enough `tofrether to insure `such action. The air enteringI through the passage 36 breaks through 'the film. at vthe centralv portion of the can' and discharges the sainel upon the work in, very fine globules.- Said-film -is, constantly broken 'by the yair or other fluid but is constantly restored through the action of capil larity. Hence the coating material 'may bemerely under suction; due--to capillary -action. The maintenance "of the supply Vof` coating material'is not. dependent upon the l presence of the air current which is used.

merely to break thefllmand discharge the globules. l["efl"ect through the described I construction a very fine :division of the-coatingmat-erial as set forth in my Patent iNo.

The construction of parts thus far described efects the lformatmn of a mass of spray of general conical form issuing froma tool or appliance for applying coatthrough the orifice. 39, but generally circular .l in cross section. This result is effected by the'disruptionbf the film formed between the cap like members 30, 37 through the agency of the airorother suitable fluid in t A the manner Valready described. g v'Iam aware that it has been proposed to modify the character of the spray issuing ingby means of supplemental jets of air directerl upon the discharged spray, as' shown,-

for example. kin the patent to Burdick. No. etai-3o, tiene May-15, i909. in accordance.

with this patent, the of the spray displemental air jets directed upon the Ispray issuing from the discharge end of the tool or like appliance. A's' fully set` forth in my the issuing spray from a conical formation circular 1n cross section into a sheet. lin

said patent, I disclose means and av prcess whereby a mass of spray as discharged mayl be given any form incross section between that of a relativelythin sheet and aY cone or 'mass circular in cross section.l

In accordance with the vpresent invention, l provlde means whereby the issuing spray may be permitted to retain its sha-pe defined as circularin cross section or whereby said issuing spray may be' given the formof Patent No; 1,321,014, 4ll therein provide for discharging supplemental air jets upon the discharged. 'film of paint or other coating material and in such. a manner as to change or transform 'charge i'schangedfrom a circular form'into f that of a thin sheet through the'use of sup-l a relatively thin 'sheet in any'. position 4throughout the circumferential extent-of the tool :or apparatus.

Cee;

l provide a generally cylindrical'member 42 having any suitable number of v'(,and

preferably'two) tubular extensions-43, 44

preferablv diametricailly opposed to -each other and lterminating-in discharge passages, 4b, 46 desirahly inclined toward'each other j,

and'clearly represented in Fig` 1. .i

The two or other number of supplemental i air passages 43, 44 are in communication at their inner ends through ports or vpassages* 47, 48 with. a completely annular passageor groove 49 formed upon the outer surface ofl theforward end of the body l, as indicated in Fig. 1. Said annular passage or entire circumferential extent of'rotatio'n of groove is in constant communicationwith v said ports or passages 47, 48, throughout the the cylindrical member 42 until said-member 42 has been turned a sufficient number of times u on the body 1 to withdraw the said ports 4 48. out of alignment or communication with the said annular groove or passage 49,- as indicated in Fig. 2. This result is accomplished .in any suitable.: manner buty preferably by providing the body 1 with an ext/ended threaded surface 50. and the inner surface of the cylindrical member 42 withA a similar thread 51.` The constructioniis such that. said member 42 may be rotated sufiiciently. to be' moved from the position indicated. in F ig. 1 into the position indicated in Fig'z`2, and thereby cut off communi* cation with the annular passage 49. So long; however, as the- passages 47, 48 are in communication with the annular groove or passage 49,"the jet orifices 45, 46 may be placed in any1 position throughout: an entire circle'of movement, and hence the thin sheet er line Q f coating materiel may 1ie in any plane or position throughout an entire cir cumference.' i

The passages 47, 48 are of such size asV l to. )ermit rotative movement of the member 2 t roughout a complete circle Without in-4 terfering at all or' to any substantial extent with the discharge of the motive agent supplementally through the passa-ges 43',

The annular passage or groove 49 and hence thel passa 43, 44 are in communication with thev longitudinally extending passage 52 and the communicating passage 53 of the body 1. such passage 53 beingin communication ivith the main air passage 35 through v a small port 54. Said port 54 is not controlled by a valve. as iin my said Patents- No. 1,321,014 and No.'1,368,612, since in order to rinterrupt the communication be tween themain air passage 35 and the supplemental air passages 43, '44, I dependv wholly upon a continuedturning movement cutting off the supplemental air supply, as.

.tion shown in Fig. 2.

of the cylindrical member 442, suiiicient to;

move it into or substantiallyinto the posi? It will be evident thatthe annular pas! sage or groove 49 may if desired be formed i in the inner surface of the member 42 and that other vchanges may be made Within the Vscope and purpose of theinvention. In my that is eifectedbythe valve l55, and e-x. pressly counteracted by I'the enlargement of the passages 47, 48,;49.

In the presentl invention I provide for adjustment in;l bothdi-rec'tions longitudinally and provide a relatively prolonged threaded surface bothl in advance and.` in the rear of the annular.passage/495` It isi evident that if the adjustmentWere'{only -in=ja forward direction, then unless the rearfjlendof the member 42 were very' thickf-adjustment su'icient to cut oii' the`supplemental air. supply might leave the annular passage 149 Wholly unclosed Vin the rear of.. sai d inember Further, the present construction gives a more prolonged engagement" betiveen-- the body andthe member'42, and prevents'pos-- sibi ity off leakage. It also permits' more extensive variation of the point or place atV which the supplementaljetsimpinge upon the main j et. v My invention'in its-broadest application is not limited to the formation of a film of the Coating material, since such coating ma terial may be positioned With respect to the dischargin' motive fluid in "any suitable xiianner.` referably, however, l provide for forming, breaking through and discharging the film.

embodiment of my invention, I desire it to be understood that although specific terms are employed, theyl are used in a generic and descriptive sense and not for p urposes ol limitation, the scope ofthe invention being set forth in the following claims.

-- .'Ulaims- 1 1. Means for applying coating comprising a body having means for supplying coating material, and having means to subject the same to the actionof a motive agent` thereby effecting the dischage ofthe. coating niarterial, and means mi'unted for complete circumferential mnvement Yabout lsaid body to discl'iarge a` Inotiveagent supplementally :upon .the discharged coating material at any angle, saidmea-ns to discharge the motive agent being longitudinally adjustable in both directions upon said body and thus constitilting the sole means whereby such supplemental discharge is permitted or is Wholly -cutoff Without affecting the main -air supply.

2. Atool `for applying coating comprising a body having passages 'for lcoating material and for a motive'iiuid under" pressure and a member supported upon said body and having one or more supplemental motive- -agent discharge passages' adapted to communicate withthe -motive agent supply pas- Having thus described one illustrative sage, said member being longitudinally adjustable-upon the body in both directions so as Wholly to cut oft' the supplemental supply of the motive agent or to permit such supply and constituting the sole means' to control the supplemental supply Without affecting the main air supply. j

I 3. A tool' for applyingcoating comprising a having passages oijcoating material and tora motive' iiuid under pressure and a member supported upon said body and having one or more supplemental motive- 'agent discharge passages adapted to communicate with the motive agent suppl pas. sage in said body, the said member' aving ports l correspon'ding in size to the motive agent supply passage and having a threaded engagement -With the `.body permiitting it to be moved thereon for the purpose of,

Wholly cutting oit Without leakage all communication with the motive agent supp-ly passage and. constituting the' sole means to control the spplement-al'supply Without affecting the main airsupply. 4. A tool' for applying coating comprising a body havin-g passages for coating material and for a motive agent under pressure, a. member 42 supported' upon said 'body and having passages 47, 48, thev body having an annular passage 49 adapted to communicate in all positions of circumferential adjustment with the passages 47, 48 said passages 47,

and corresponding in size,

body having a supplemental air passage terminating in an ,annular passage, the surface of saidbody atopposite sides of said annular passage -beingthreaded for a relatively extensive' area, a member 42 threaded upon said body ,and hayingvpassa s 47, .48,

adapt-ed to. -communicate With sai annular `passage 5 in all Y positions of circumferentialadjustment, said memberv42 being capable of longitudinal adjustment-inboth direc* tions Vupon said extensive threaded areas S0 v as wholly to cut o'' communication between the annular passage and said passages 47, 4 8.

'6.' A tool for'applying coating comprising a body having passages for coating material and lfor a 'motive .agent under pressure, ysaid body havinga valveless 'supplemental air passage 58,52 terminating in anannular passage 49 at the surface of said body, the latter being extensively threaded in the rear of and in advance of said annular passage, and a member 42 supported upon said body Aand having passages 47 '48* adapted to comrnain air supply.

.nemen ,municate inall positions ot -circuin-ferentia Y sai l member 42 being capable of longitudinal adi justment in both directions upon said exten-- sively threaded area so as to out oil' coinrnunii. cation' between the annular passage and said adjustment with. said annulai 1 passa paages 47, 48. v 4

7. A tool for applying coating comprisin a bodyhaving passages for coating material and for av motive agent under pressure, said body' having a supplemental air passa-ge terminating in an annular passage, a supplemental Jetmember mounted upon said body,

and ha-ving' vpassagesA `for supplemental air adapted tol be'placed in communication With said annular passage, said supplemental jet member havingl clrcumferential movement `about'said body, its'passages for supplemen- ,-tal air being adapted to .communicate with the annular passage in all positions of circumferential adjustment, said supplemental jet member being movable longitudinally of said body in bothdirections sufiicientlyto esi cut off the supplemental air, Without leakage f when moved in both directions"longitudi .na.lly, said supplemental jet member. consti-v` tuting the sole means for cuttingo the sup plem'ental discharge Without, affecting the.'

.In testimony whereof, name to this specication.

HERBERT W. par.

'l have signed my'

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