US988978A - Apparatus for coating objects with subdivided material. - Google Patents

Description

G. L. CRAGG. APPARATUS FOR COMING OBJECTS WITH SUBDIVIDED MATERIAL.

APPLICATION FILED 0013.24, 1910.

Patented Apr. 11, 1911;

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. powder to all exposed surfaces ot the object 4in'addition to the surfaces directly facingr vuted over an area substantially coextensive to the largest surface that maybe exposed citizen of the United States, residingr at of which the following is a full, clear, con- -ing a part of this specification.

4coating objects 'with comminuted, subdilish a. closed local. path or circuit, which is The powder is admitted tothe flowing;

caused to leave the receptacle through ya GEoRGmL Omoo, `or CHICAGQILLINOIS, AssIGNoR ro BRADLEY 'AN:n \noom4mr '1 COMPANY; 03F CHICAGO, ILLINOIS,

I APPARATUS Fon concerns oBJEcTs WITH SUBDIVIDED lMarsratti;"" Y i .t ,f i-www1' To all 'it maycofnccn-j Be it known -thaft'L- GEORGE L. CRAGG,

Chicago,"in the county of 4Cook and btate of Illinois= have invented a certain new andu'seful Improvement in Apparatus for Coating Objects with Subdivided Material,`

oise, and exact description, reference being had to the accompanying drawings` form- My invention relates 4to apparatus for videdor powdered material and is of particular service in spreading bronze powder sive material or paint which in its fresh state holds the vpowder scattered thereupon and in itsdry state firmly fixes the powder in place- In practicingJ my invention, l employ a7 receptacle for containing the` object that is to be coated with. the powderedmaterial, a .fan or blower for eiiecting forced circulation of air lthrough the receptacle, andl piping which desirably includes the blower and receptacle in serial' relation to estab- Specification of Letteis'latent. 'Application filed October 24,

preferred, for the circulating air, though I do not wish to be limited to this'way of practicing my invention,

air preferably through the piping. As my invention is preferably practiced, the air is preferablyV drawn in from'the exterior of the receptacle and is blasted through a blast pipe section,V a section 'of the aforesaid piping, which has that end which directly .communicates with. the receptacle vinterior changeable in position to enlise the powder laden air to swirl and thereby carry the the air entrance., The 'air is desirably plurality of exit openings that are distribwith the largest area to .be coated with the' powder. to insure the access of the powder thereto. In thepreferredembodiment ot'- my invention, the aggregate area of .the air the air exit side of the receptacle to apower exit openings does not exceed the area in right cross section of the piping conveyingr y the airy from the receptacle, so that the I Patented i910. semiaaasraa powder laden air is'forced,` toi4 seek. all that space within the receptaclejfwhereh'theal jects to be coated with powderperei'prop rly located. .'In the preferred-.embodiment of my inventiom-A the exitg openings Aar'elafforded by 'means p plate located in front 'of the exit portionof the pipe and in which screen the openings.

are distributed over. the'desiredarea. p t

I will explain my invention `moreffully Aby reference-to the aocompanyingdraiwing showing the preferred and in which- .Figure 1 is an elevationipartlywn, section, of such preferredenibodiirientf 2 is a., sectional view 'in the* direction of arrows 2 2 in Fig. l'and 3ds a sec-4 .embiimaleeref tional'view in the directioniof arrows i inl4`ig.1.` H Like parts are indicated bynsimilarjharactors of reference throughout the different figures. I

lof a screen-or :perforated f The receptacle@ is shaped 'su'itabl Fftb thel objects to be received thereiny' thec instruction illustrated being welladapted'to receive metal bedstead partsthat are moved 'iso into and out ofthe receptacle"uponatruck b through a `doorway c, a bedsteaddpart'd.

boing-illustrated within the receptacle; The

door way' constitutes an openingthrough which the objects tobe coated maybe passed into the` receptacle interior in position l'to enable the air to be circulated'around and i 904 towardv the objectsand the door c const-it-utes a closure for Said.openingifor'f.pre-A venting escape of material laden vair-therethrough while the objects are being coated. A section e of suitable piping Ieadsifrom 111 `will move about the'centero'f the other through an upright. conduit V A:tot

end of said pipe teiminal. "In other words p the discharge end h1 is eccentric with'respect desirably causedby iinparting a rotaryv movement tothe terminal 'about anaxis" that includes ,thexcenter of the pipe1 andcoinpanion to the enditl/and' whereby, as the air lis blasted into-the recepta'lclethe` paths or directions it followsv swirl' and 'thereby lare "'alte'red thoroughly to distribute the air throughout 'the interior fgf the' receptacle and lin a manner tocause 1t toreach all exposed portions ofthe article- ;O .be `coated. the powder `finding lodginenty net on'ly uponl those adhesively'c'oated sur- ,jfav'ce'jportionsof the object' or vstructure d are immediately in front ofthe opening," but also.; 'upon 'all other exposed adhesivelylcoated surfaces of-said object as well'1nclud1ng those atthe top, bottom,

.lends and backs of said object.

seeking paths of least resistance.

lage of air where tionthrough the portion z 'The deected ppe section h issecured` at j its outer end to a wheel h2 that issecuredto its hubs by means of spokes that are widely separated for therethrough, being included in the Yexternal circuit for `conveying the air to and from the receptacle interior. The wheel h2 co-aXial with' the pipel thereto'and the shaft h3 that is driven by a belt h4 through gearing 71,5 to rotate the pipe yterminal L for the purpose which has been described. 'A stuffing box hsprevents leakthe shaft passes through the piping. -Further to insure the carriage o f the powder'to all surfaces upon which. it. is to be lodged and to improve the swirling for this .purpose I also multiple the air exit openings anddistribute them oyer'an area that preferably exceeds the largest exposed surface upon the structure "d that is to receive the powder. These mult-ipled air vexit or discharge openings are desirably constituted of the perforations p in a screen plate g preferably constituting a wallv of the receptacle' a.A The aggregate `area of these screen openings is preferably area of a right cross secof the pipe e that is uniform in diameter, the escaping air passing through all of the openings p in The end of the pipe. section e'adjacent to the screen 'Q flares toward said. screen and embraces its not greater than the -A borders.

- tacle more than a 'required to coat it 'of the p ipe disj j ing air through j the 'pipe end h1, is eccentric. 'In'this way'the discharge end 'y 411.1 is ,caused-'to travel in aicircle or .-orbit,

the passage of. blasted air' the space between these spokes Ais concentric or j end directly securedv The structure (l may remain in the recep-A esame adhesive Vmaterial will only hold what'.l

powder is properly required to coat .the structure. The powder that does not adhere to the structure d `continues to circulate through the closedair circuit which has been 'described as long as the fan or-blower is forcthe receptacle," and the amount lwhich becomes lodged upon said structure is replenished at I In order lto prevent the powder laden air from escaping at the door to the recep-- tacle whenarticlesare inserted ywithin and withdrawn from the receptacle without stoppingthe operation `ofthe fan or blower, I "discontinue the path .for the flowing air preferably by cutting off communication .between t-he blower 'and the pipe section gas by means ofla'l valve g1.

I have herein lshown scribed the preferred embodiment of my' invention', to which, however, be limited. l I l Having thus 'described my invention, I claim as new anddesi-re'to secure by Letters Patent'the following 1. vApparatus for coating objects with subdivided material carried vby air, including. a receptacle for the objects; a piping section whose bore is in communication withthe receptacle interior; means for effecting.'

forced passage of air through -the bore of said pipe section; and means for permitting movement of said pipe section wherebyA Ido not wishto l s'( and particularly detheair within the receptacle is .caused lto change its direction and thereby carry the material withwliich it is laden to variousv parts of the object to be coated therewith, there being a plurality of openings affording communication between the receptacle interior and exterior and located to have the object to be coated placed between the same and the aforesaid pipe section,

2; Apparatus subdivided material carried by air, including a receptacle for the objects; a pipe section whose bore is in communication with the receptacle interior; means for effecting forced passage of air through the bore of said pipe section; and means 4for permitting movement of said pipeseetion whereby the air within the receptacle is caused to change its direction-and thereby carry the material with which it is laden to various parts of GEORGE L.l cimes.l

lVitnesses Guo. C. DAvisoN n ETTAL. IVHITE.

for coating objects with

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