US1664803A - Paint-spraying machine - Google Patents

Description

April 3, 1928. 1,664,803

1 R. s. AGAsslz PAINT SPRAYING MACHINE Filed Dec. 14. 1926v 7 6 EE 3E y Mg Patented Apr. 3, 1928s LEWIS RUDOLPH sHAF'ro AGAssIz",-.-r vcoiivnvvi'rrsn centinaia, .cAnL

My invention relates to`improvements in paint spraying 1nacl1ines, which has for its particular objects the provision-'oi' means whereby a delinite indication -i'sgiven tothe operator when vthe supply of paintis reduced to a predetermined low level inthe `container by ;shutting oil' the supply of'paintand air simultaneously; to provide a secondary-` agitation to the paint and Ato reduce thepaint prior to spraying to av state of fine-division.

lThe invention consists essentially yof a container `for paintmeans` for admitting air to the container and for removing paint therefrom', v means for: reducing the pai-nt to spray'form and for submitting, itto a ufur- `ther agitation, and means 'for closing oil' the flow of air to the container andthe delivery hoseas ai, predetermined low paint level is attained7 as will be more fully described in the following specification, in'which Fig 1 is a general view'of the invention, part in section.A 1 ,t ':"ig. 2 is a sectional view 'of the'paint ejector.

Fig. 3 is a sectional view of the Ifloat controlled air valve( In the drawings like gcharact'ers'of reference indicate corresponding parts in each figure, l f

i The numeral 1 indicates generally a container` having side walls 2,a Abottom wall '3, a top closure 4 and acapped il'ler o'pening. The numeral 6 lindicates a transverse-:header pipe having anair supply Vora eheckfvalve 7 to .which aJ hose V8 is connectedfrom `a si1it ablesource of compress'edrair. An air valve 9 is litted in the header 6 whichis provided with an inlet passage 10,an outlet A11,`a 'container branch outlet 1 2 and' a valve seat'13 ldividing the passage 10 yfrom they outlets 11 and 12, which seat is'provided with a poppet'valve 14 having a steml. Extending fromt-he branch outlet '12 Ais a pipe 16 `hav ing a check valve 16A adjacent its upper end which is adapted to open to release air pressure/from the top of the container' into the pipe 1 6, and a guide"1`l7 at its rlower end. Vertically movable inthe pipe 16 is a rod 18, the lower end of which forms a valve 19 to prevent thel passage of paint upwards into the pipe. Adjacent the upper end of the rod is a plurality of springs 2OV which are adapted to bear against the inner side walls of the pipe 16 and are of such strength as to resist the freevertical movement of the is al'float 21 having such buoyancy when'sub- 'mergedas overcome thev -resistance'of tlie springsQO and to move the rod and' the'pop- 'pet fva'lve- 14, which. the rodv engages7 inzan upward direction to Vopen ftliecvalve, and is o1 vsuch "weight, as vtofmo've' the rod downwards` against the resista-nce of the .springs when but- 'partially supported by liquid5 and by so doing allow the poppet valve14 to v.close upon itsfseat 13.

llhenumeral22 indicates vany eject-o1' litted to the' header 6v which' is provided fwith 1a lnozzlev 23, see Figure 2, an inletvalve. 24and anf outlet passage; 25. A4 pai-nt suctionripipe l26de` connectedtoathe inletpassage 241-and leads lfrom l a point adj acentthe bottom wall 3 of the container. A sprayt pipef27 extends `beyond the-peripheraliedge of the container 1, :where it' is 'fitted withaT 28, laivalver29, -a

T 30,. a ini-ther valve 31 .and a 'delivery hoseV Extending rO1ntl1e"T5Q8 isa Lpipe 33 v.which1(mmmunieates1with bottom i header Y generally indicatedv by the numeral 34,;wliich 'f is provided; at V its outer .Tenda with la clean .out Y .-plu'g. 35 .and at its inner Jend'fwith; a valve 36 for: the purpose f of draining paint yfrom tbe container f `when desired. ylibrtendi'ng 'down- "wards from PthecT 30-.ris =af pipe 37 which is enlarged lasaat 3 8 to a diameter @in-'excessof f A thezpi'pesi- 2711and7=33 to j form Aa Yre,agitating chamber= which connects at 'its lower -end 4tating chamber. v

VHaving lthus Adescribed the severalv `parts lof my invention I will now brielyvexplain -itsfui'icton. ,o y

The air.- sup-plyv-to thecontainer l1 andato f the ej ector `nozzle` '23 is admitted through .the valve 7, ,and duringv such ytime as a working supplyfof `paint is inthe container, .the buoyanc'y of the loatQl immersed'i-n the; paint. yholds the valve 14 invoelevated position, so v that air may flow therethrough from the air supply to the nozzle 23. So long as the mar'od Atthe lower extremity of fthe rod chine is being operated and paint withdrawn f from the container through the velocity of air passing'through the nozzle 23 and acting as an ejector'7 an amount of air equivalent to the paint displaced will descend the tube and pass through the valve 19 at the lower extremity of the pipe 1G. Should the air supply to the valve 7 bc shut ofi", the air pressure throughout the system will become equalized and stationary. As the paint level iii the container l falls toV a point of loata`- tion oi' the float 2l, or that position where it would normally comii'ieiice to fall, the resistance of the springs 2() upon the walls of the pipe 16 becomes effective to maintain the float at rest and the valve l/l open. Asthe paint continues to recede from the float the downward strain on the rod 18 increases un til the spring resistance against the ytube side walls is overcome, when the float 2l will fall into the paint to its point of 'tloatatiom which will be sufficient to close the valve lll against its seat 13 and to stop the i'iow of compressed air into the pipe V(i or the coii- -tainer l.

The paint on being projrcted'linto the .header 27 is broken up by the jet of air trom the nozzle 23 and enters the tube 233 and the bottoin header as a spray,it is thence projected upwards Vvin the tube 38, where it builds up a column or'.I paint,.or paint may it desired be introduced by the temporary opening of the valve 36. rlhe subsequent Vspray of paintr passing through the restricted orifice 40 enables the coai'ser particles thereo'f'to be assimilated in the column of paint inthe'chainber, `while the bubbles of air will become impregnated with paint, thus producing 5a spray of aerated paintof constant density to pass upwards therethrough for discharge through the hose 32 and the jet. Should the delivery hose 32 become disconnected or other Asimilar accident occur when operating, the air in the 'air supply'to the machine beshut oi at the valve 7 and the jet of the delivery hose 32 be opened vwhile pressure exists in the contaiiieiga' similar result will be obtained, the air in the containerexpandiiig and passing outwards therefrom through the check valve 16A, and will quickly equalize the air pressure at the top of the container and in the to close against the air inlet, and means as the paint reaches a predetermined lowlevel to close the valve.

2. Ina paint spraying machine. having a paint container, a paint ejector, an aerated paint outlet and an air' inlet tothe container and the paint ejector, a valve adapted to close against the inlet, and means for effect-` ing said closure instantaneously whenthe paint reaches a predetermined low level..

In apaint spraying machine having a y paint container, a paint ejector, an aerated paint outlet and anfair inlet tor .thecontainer and the paint ejector, a valve adapted `to close against the inlet, anda lioat` for operating thevalve. o K

l. ln a paint spraying machine-'havinga paiiitcontainer, a `paint ejector, an aerated paint outlet, a valved inletto-the mit chine having ay normally open valve having av passageexteiiding below the normal paint level of the container and throiigh which air is admitted to the container, and means as the aerated paint outlet is closed for sealing afithe lower end of the passage te prevent't'he introduction of paint thereto.

v5. In a paint spraying machine having a paint container, a paint ejector, an'v aerated paint outlet, an inlet to the ejector and an inlet pipe for delivering air to the' coii-..

tainer below the normal paint level, anda check` .valvecommunicatingV between the uplper portion of the container andthe inlet pipe.

eating with said container whereby avertical column ofV paint is maintained 1n said n a paint spraying machine thecoinbi- I, ,nation of a paint container, a vertically eX-f `tending tube having its lower end communitube,an air operated ejector throughfwhich paint is ejected from said container and means for causing the paint dischargedby said e'ector toripassn wardli through thev vertical column of paint iii saidtube prior to being delivered to the pointojt use. i

Dated at Vancouver, B @-7 Cmada thisVA 7th day of December, 1926. i

irwis mineurs sii/irre iieiisfsiz.'

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