US2108998A - Apparatus for fusing and spraying pulverized substances - Google Patents

Description

Feb. 22, 193s. l F, SCHOR, 2,108,998

APPARATUS FOR FUSING AND SPBAYING PULVERIZED SUBSTANES- Find March 12, 1955 2 sheets-sheet 1 JF d f 40 35 *lf J2 50 Z6 @56156 ,J3 37 Feb. 22, 1938. F. scHoRl v 2,108,998

APPARATUS FOR FUSING AND SPRAYING PULVERIZED SUBSTANCES Filedmaron 12, 1955 2 sheets-sheet 2 INVENTOR lfaym ATTO YS Patented Feb. 22, E938 APPARATUS FOR FUSIING AND SPRYENG PULVERIZED SSTANCES Fritz Schori, Wetzikon, Switzerland Application March i12, H5935, Serial No, M525 lin Belgium hdareh i12,

i2 maints.

The invention relates to coating apparatus oi.

reissued June 22.1937, No. 20,425, that is to say.

10 apparatus consisting generally of a hand sprayer device hose-connected to appropriate sources of supply of the spray components but itself adapted for ready manipulation to meet the exigencies of the work. The present improvements concern especially the organization of the spray device. to the end of providing for better control -of the spray and its components, and also the provision of improved means for ensuring an appropriate powder supply for such device, all as more particularly set out in the ensuing description.

In the accompanying drawings Fig. 1 is a part sectional view of a preferred form of spray device embodying the invention; Fig. 2 is a view, partsectional on the line II--II of Fig. 1; Fig. 3 is a section, somewhat enlarged,l on the line llIII---IllI of Fig. i; Fig. 4 illustrates a preferred form of powder receptacle and Fig. 5 a modified form of receptacle.

:m The hand apparatus illustrated is preferably of pistol form, comprising generally the barrel section i and handle 2, the latter containing supply passages for the several spray ingredients and the former organized to distribute and direct such ingredients to the point of discharge.

Passage il in the handle supplies the combustion iuid, such as a mixture of oxygen and acetylene, by way of a mixing unit indicated at large by the reference l. This unit comprises a body lo portion having nipples 5 and 8 to receive hose n in) connections from gas bottles or appropriate sources of supply of oxygen and acetylene, re-

spectively. As shown in Figs. l and 2, the oxy gen supplied to nipple enters chamber i and passes into chamber d by way of port 9, as determined by the setting of valve IQ. From chamber d it passes through a central bore Il in plug l2. The acetylene supplied to nipple t, enters chamber l@ and ,passes into chamber ld by way of port l5 under the control of a valve similar to valve iii. From chamber ld it passes through slots it in the outer, threaded surface of plug i2 and discharges around the upper endof the plug, thoroughly mingling with the oxygen discharging through bore li and, with it, discharg ('Jl. www2) ing into an expansion chamber il formed in stern iti. By this arrangement thetendeney for bacio ring to occur in the handle of the piston is re= duced/to' a minimum.

Stem i@ is threaded throughout a portion oi? d its length, as at ide, and by means of nut 2@ is drawn up tight in the pistol handle, which construction aiso permits ofthe removal or the mix= ing unit bodily, as .for cleaning or inspection, without disturbing the adjustment of oxygen' valve l0 or its companion valve for the acetylene.

Passage I9 in the handle terminates at its lower end in a nipple 2i) for hose connection to another source of uid under pressure, preferably and hereinafter referred to as compressed air,y which is supplied to the pistol, through passage i9 and under the control of a shut-oil valve ZI,- for the purposes below described.

Passage 22 formed in the handle parallel to the passage lil is connected by its nipple 23 and u1 a hose (48) with the supply of the fusible powder to be sprayed.

In the barrel portion of the pistolis seated a distributing sleeve the head 25' of which has a. central bore 2t and two sets Ioi ducts marked .a 2l and 2d, respectively, and at the forward end of head i5 are mounted spaced concentric sleeves 29, t@ and 3i, the last-mentioned carrying the nozzle cap 32. As thus organized, the gas supplied by way of passage 3 flows through ducts 2l w.

and emerges at the annular ame oriices 33. Surrrounding the flame orifice is an outer orifice 3d to which compressed air is supplied from pas sage i9 by way of ducts 2d, the air sheath thus formed increasing the projection velocity of the $5 enveloped spray. Furthermore and as shown ln Fig. 3, the air sheath orice is preferably of el liptical form, whereby the advantage is secured that the larger volume oi air discharged at the sides of the dame serves to hatten the latter, o permitting e. brush-like application of the spray nd ensuring maximum covere, with uniform- .V- f According to my invention a portion of this same air supply is applied to still another pur- 45 pose, viz. the transportation of the powder to the pistol, as will new be explained.

At the rear oi the barrel portion oi the pistol is inserted an aspirator unit consisting of a body portion 3E having a forwardly extending stem 36 50 which is threaded into the head of sleeve 2li. An aspirator nozzle di projects into a suction chamber 3d which is connected by ducts S9 with an annular groove d@ into which passage 2d discharges.

The body portion of the aspirator unit 55,

" is also traversed by ducts 4i, by which a portion of the compressed air supplied to the pistol by way of passage i9 is conducted to the aspirator,

whence it is discharged into and through the central bore 42.. A suction ilow is thus induced in passage 22, by which the powder to be sprayed is drawn from the source of supply into the suci tion chamber, whence it is projected, with the may be adjusted as required by needle valve 42,

and this adjustment is accomplished without of itself. materially affecting the proportions of the flame and air components of the spray, as will be apparent. In this connection it will be seen said prior patent, viz. of placing adjacent, but l that all of the spray components are capable of adjustment into a fixed relationship the one with the other,'to produce a desired flame and a continuously uniform flame-spray, dependent, of course upon the admission to it of a correspondingly uniform supply of powder.

In this latter regard the invention contemplates the use of the principle disclosedin my outside of the body or mass of powder a hole or holes by which air is admitted to satisfy the suction created by the pistol and thereby produce a suction-induced air stream for transporting the powder to the flame at a non-fluctuating rate, but according to this invention such powder-bearing air current and also the powder receptacle are organized for better and quicker control of the delivery of powder to the flame without tendency to overfeed-the powder` upon the resumption of the air current after an interf ruption.

In the preferred form illustrated in Fig. 4, the powder is contained in a double chamber or hour-glass type of receptacle, formed by the two conical cans 44 and 45 connected by a narrow passage or throat 46 which may be provided with a shut oif valve (not shown) and which permits a continuous gravity feed from the upper to the lower can. The throat is provided with a horizontal outlet duct 49 terminating in a nipple fitting 41 by which it is connected by hose 4l to the pistol nipple 23. 'It is also provided with an air inlet duct 50 to which air is admitted by way' of port li under the control of valve 52. The air from this entrance passes across the throat and forms the air stream by which the powder is borne to the flame through hose 48. It falls through the throat from the upper can and is picked up by this air stream so long as the stream is allowed to ow and such of it as is not thus picked up continues on through into the lower can. Each e'nd of the receptacle may be provided with a hook 53 by which it may be suspended and by means of which it can be reversed end for end when the upper can becomes exhausted thus to utilize the powder that was not picked up by the air stream. As in my said prior patent an unbalanced air motor may be provided to agitate the container and thereby ensure a uniform flow of powder, and such a device is shown at 54.

In Fig. a single powder-receptacle 55 is shown, likewise adapted to be agitated by a motor 54, but .in this form the flow of the powder does not continue during the interruptions of the air-stream flow. The receptacle discharges through a narrow throat 46* directly into the bore into the;v

`V-Junction of two angularly related passages 58 and Il. The former of these is connected to the pistol by way of the hose 48 and the other is for the admission of air by way of the vent Il controlled by the valve-screw IQ. Together they constitute part of the path for the conveyor air stream that flows to the pistol and they are of about the same diameter as the throat. Because of their relatively steep angle they do not fill up with powder descending from the receptacle, on the cessation of the air flow. to such an extent as to form an'objectionable slug of powder to pass into the pistol on the resumption of the live flow. Thus in both forms of receptacle the powder-carrying airstream can be stoppedl and started as desired without resulting in an initial overfeed of powder.

The stopping and' starting of the powdercarrying air stream, which is normally necessary from time to time in the progress of the work,

is controlled vin a simple manner and without disturbing the llame characteristics or requiring the repeated adjustment of any of the control valves. This is accomplished by providingl an alternative or second'air admission passage by which to satisfy the suction that is produced by the aspirator in the pistol, and which takes the form of an air duct 80, constituting a branch of passage 22, and terminating in a port 6I located at the rear of the pistol handle in position to be covered or uncoveredat will lby the thumb ofthe operator holding the pistol. When the port is uncovered the aspirator suction is satis-4 ed by air entering direct from atmosphere through duct 60 thereby so reducing the suction eil'ect in the hose 48 as to render it substantially ineffective to convey powder to the pistol. Restoring the thumb on the hole 6| causes resumption of the powder feed to the pistol and in either case substantially the same amount of air will flow to the flame spray.

1. Coating apparatus comprising a flamespraying device for fusible powder having passages therein to conduct and discharge the spray components, including a passage adapted for connection at its entrance end to a supply of air under pressure and having two branches separately leading to the point of iiame discharge of the apparatus, fusible powder supply means asflame discharge and adapted for connection to a combustible mixture supply.

2. Coating apparatus comprising a flamespraying device containing passages for the spray components conducted thereto under pressure and including an aspirator, means for diverting part of the flow of one of said pressure spray components through said aspirator for the operation thereof, and thence to the spray, the remaining part of said component passing direct to the spray, a fusible powder supply passage subject to the suction created by said aspirator and a fusible powder container provided with means for constant rate delivery of the powder into said suction supply passage.

3. Coating apparatus comprising a iiame spraying device having means forming an-annwlar. flame discharge orifice, a central passage and an outer, annular orifice, a passage in the device communicating with saidvfiame orifice and adapted for connection to a combustible medium sup'n ply, a second passage in said device adapted for connection to a compressed air supply, aspirator means adapted to discharge into said central passage, a suction passage subject tothe action ofthe aspirator means, means for feeding lpowder to the suction passage for delivery therethrough by the aspirator-induced suction, and means whereby a portion of the compressed air supplied to said second passage isv discharged through said outer, annular orifice and means for discharging the balance of such air through aspirator means. Y v

4. The combination of aame-spraying device having aspirator means therein, means forming a passage subject to the suction of said aspirator means, and having an air admission port whereby a streamA of air therethrough is induced by said aspirator means, 'and a receptacle for a supply of fusible powder comprising upper and lower containers havingmeans forming a passage cone necting the same to permit gravity now of powder from one container to the other, such passage and the first mentioned passage intersecting one another, whereby the suction-induced air stream intersects the path of the Afalling powder and such powder as is not picked up by the air stream falls through into the lower container.

' 5. The combination .of a name-spraying device having aspirator means therein, means form ing a passage subject toLthe suction of said aspirator means, an air duct including a 'downwardly inclined portion and an adiacent, upwardly inclined portion, a container for a supply or powder having an outlet arranged to permit gravity discharge of the powder therefrom at the junction of said duct portions, a hose connection from said upwardly inclined portion to said passage, and means for controlling the aspiratorinduced suction in such passage.

6. Coating apparatus comprising in combination a flame-spray pistol adapted to discharge uid ingredients supplied thereto under pressure, aspirator means associated with said pistol and adapted for operation by one of said ingredients. a container for a body of fusible powder to besprayed, a powder supply passage subject to the suction of said aspiratormeans,

means for conducting the powder from its container into the air stream induced in said passage by said aspirator means, and means for starting and stopping the flow of powder through said passage comprising an air admission Vport for said passage adapted to be normally closed by l the hand holding said pistol and located intermediete the aspirator and the point of discharge of powder into the passage, said port having a capacity adapted to 'satisfy .substantially the whole of the .aspirator suction.v

'7. Coating apparatus comprising in combina.- tion a flame-spray pistol adapted to discharge uid ingredients supplied thereto under pressure, aspirator means associated with said pistol and adapted for operation by one of said ingredients, acontainer for a body of fusible powder to be sprayed, a powder supply passage subject to the suction of said aspirator means, a port located to admit air to said last mentioned passage other than through the body oi powdera in said container, means for, conducting the powder from its container into the stream oi" air entering said port and owing through said passage under the suction induced by said aspirator means and means for 'starting y and stopping the now o powder through the passage comprising an 4air admission port for said passage adapted to be normally closed by the hand holding said pistol and located intermediate the aspirator and the point of discharge of powder intothe passage, said port having a vcapacity adapted to satisfy substantially the whole of the aspirator suction.

8. Coating apparatus of the character described including a powder supply device comprising two containers connected by passage means, a spray pistol, iced conduit means .for the pistol connected to said passagev means, and means for supporting said powder supply device with either container uppermost. v 9. Apparatus as in claim 2 having three spray component passages concentrically arranged at the spray oriiice, the outermost passage conducting air and being of elliptical form to give a fiattened spray.

io. Coating apparatus comprising a flamespraying pistol containing passages tor fuelgas and compressed air and including an aspirator, meansfor diverting part of the compressed air now in one of said passages through said aspirator i'or the operation thereof and thence to the spray, the remainder of such compressed air passing Adirect to the spray, a powder-supply passage subject to the suction created by said aspirator, a

container kfor fusible powder having constant rate delivery means into said suction supply passage, said latter passage having two entrances tor atmosphere, one being located beyond the point of connection thereof with said container and the other being on the pistol under the operator's control and adapted when open to satisfy the whole suction demand of saidaspirator.

il. Coating apparatus as described comprising a flame-spray device in the Ilorm of a pistol containing passages for the several spray components, all having their entrance vendsv in the handle end of thev device and one being a combustible mixture passage, a fuel and air mixing de vice having hose connections respectively for its supplies of fuel and air and means for removably attaching said mixing device to the pistol handle in communication with said combustible mixture passage.

l2. Coating apparatus comprising a flamespraying device containing passages for pressure spray components and including an aspirator,

means for diverting part of the flow of one ofsaid spray components through said aspirator for the operation thereof and thence tothe spray, the remaining part of said component passing direct to said spray, and a fusible powder supply passage subject to the suction created by said aspirator,

in combination with stopping and starting means x comprising an air entrance to said aspiratorsuited for satisfying thewhole suction demand thereoi.

FRITZ SCHORI.

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