US1917523A - Metal spraying device - Google Patents

Description

July 11, 1933. A. D. IRONS ET AL METAL SPRAYING DEVICE Filed April 13 1931 INVENTOR5 qyoesu 0. IRONS. mm.

DOM/we. L. M91000? Wadi ATTORNEY.

Patented July 11,1933 1,917,523

UNITED STATES PATEN' OFFICE ANDREW ID. IRONS AND DOMINIC L WALDOG'K, OF HIGHLAND PARK, MICHIGAN METAL SPRAYING DEVICE Application filed April 13, 1931. Serial No. 529,564.

This invention relates to improvements in Figure 3 is a front view of the rear portion I metal spraying devices. At the present time of the nozzle. it is customary to introduce oxygen and other F1gure 4 is a section on the line 4-4 of gas into the device at some little distance Figure 2, and

from the location where it is to be burnt with Figure 5 is a section on the line 5-5 of the result that backfiring occurs in the device Figure 1. 1 from time to time. This invention aims, We will first describe the construction of among other things, to provide a device the housing 1 and the feed mechanism therewherein the gases are first brought into conin contalned although its construction is con- 10 tact with one another a very short distance ventional and well known in the trade.

from the location where they are to be con- Briefly, the housing 1 has a casing 2 formed sumed, and further to mix the gases at such integral therewith and on one side thereof, locations in the nozzle that all mixed gas is and 3 indicates a removable cover on the said directly subject to the suction of an air blast caslng. In the latter a rotor 4 is mounted by which the molten metal is projected from on a cross shaft 5 which also carries a worm 5 the nozzle. lhus the suction acts directly 6. 7 denotes a longitudinal shaft having 21, upon the mixed gases and draws them forworm wheel 8 thereon which meshes with ward to the location where it is intended that the worm 6; On the shaft 8 is a second worm they should be consumed, thereby eliminat- 9 which cooperates with a worm wheel 10 ing any tendency to backfire. on a transverse spindle 11. In the housing m Another'object of the invention is to pro- 1 is a yoke 12 pivoted about an axis parallel vide a metal spraying device consisting of a with the shaft 5, and adjacent its outer exrelatively simple and cheaply made form of tremity the said yoke has a gear 13 and a nozzle which, when provided with necessary feed roller 14 rotatably' mounted thereon.

25 gas and air connections, forms a fully opera The gear 13 meshes with a gear 15- on the tive unit by which metal may be sprayed if spindle 11 and the feed roller 14 rests imthe wire to be employed is fed therethrough mediately above a second and similar feed by hand; or the nozzle may be readily atroller 16 on the spindle 11. Extending tached to or detached from, a housing conthrough a cover 17 pivotally arranged on 0 taining a conventional mechanism for conthe housing 1 is a spring pressed element 18 tinuously feeding wire through the nozzle. which exerts downward pressure against the A further object of the invention is to proyoke 12 thereby holding the gear 13 in mesh vide a metal spraying device wherein the with the gear 15 andthe feed roller 14 adnozzle is supported by a transverse member jacent the second feed roller 16. Through 5 adjacent which means are provided for conthe front and rear of the housing 1 aligned trolling the flow of gases and air to the nozapertures '19 and 20 are provided through zle; and, when said transverse member is which metal wire indicated at A asses, this mounted upon the housing ofa wire feed wire also passes between the two eed rollers mechanism, wherein a flow of air for operat- 14 and 16. Thus when fluid pressure is ining the latter is controlled by said air control troduced into the casing '2 throu h a pasmeans. sage 2a formed integral with the ousing 1, Having thus briefly and broadly stated it causes the rotor 4 to turn thereby rotating some of the major objects and advantages of the shafts 5. and 7, the spindle 11, the gears the device, we will now proceed to describe 15 and 13 and thus the feed rollers 16 and a preferred embodiment thereof with the aid 14. 2?) denotes openings through the inner of the accompanying drawing, in which: side of the casing 2 for the discharge of fluid Figure 1 illustratesa side view of the infrom said rotor casing. vention partly in section, and Referring now to the nozzle and its Figure 2 is a front view thereof, also partly mounting arrangement 25 denotes a trans- 50 in section. verse member secured to the front of the housing 1 as by screws 26. Vertically through the member 25 two vertical openings 27 and 28 are provided, and into the lower ends of these openings the upper extremities of valves 29 and 30 are introduced. Extending from lower ends of the latter are flexible tubes 31 and 32. Formed in the side of the member 25 immediately in front of the casing passage 2a is a third vertical opening 33 extending therethrough. 34 is a plug valve arranged in the member 25 and having a passage 34a therethrough so that by the rotation of the said valve the upper and lower extremities of the opening 33 may be connected with or disconnected from one another. Rearwardly through the member 25 a branch opening 35 is formed which connects with the opening 33 and with the front extremity of the casing aperture 2a. The branch opening 35 is so positioned and the plug valve opening 34a is so formed that the plug valve also controls the passage of fluid into the said branch opening from the opening 33. From Figure 3 it will be seen that if the plug valve is turned clockwise through substantially 120 degrees the valve will close both the lower end of the passage 34a from its upper end and also the,said lower end from the branch 35; and also that as the valve 34 is turned in an anti-clockwise direction the branch 35 is gradually shut off.

' A rear nozzle member 36 is supported by pipes 37, 38 and 39 the upper extremities of which are welded or otherwise suitably attached to it. The lower extremities of these pipes are suitably secured to the member 25 so that their passages are in registry with the upper ends of the openings 27, 28 and 33 respectively. Thus the rear nozzle member 36 is supported from the transverse member 25. The rear nozzle member has a central aperture 40 therethrough which registers with the front housing aperture 19, and the front face of the central portion of the member is forwardly and outwardly tapered to "a forwardly projecting annular flange 42 integral with said member, which, adjacent its front extremity, is externally threaded.

Through the rear nozzle member 36 substantially radial passages 43 and 44 are provided which extend through the tapered face of the member at different distances from its axis and are in registry with the upper ends of the pipes 37 and 38 respectively. Within the nozzle member 36 is a cavity 45 with which the pipe 39 is in communication. Extending forwardly through the member 36 from the cavity 45 are a plurality of apertures 46 which are substantially concentrically arranged relative to theaxis of the said member and further from the said axis than either of the radial passages 43 and 44.

Seated against the tapered portion of the rear nozzle member 36 is a cone 47 the rear side of which is correspondingly tapered and has a plurality of concentric annular grooves 48, 49 and 50 formed therein. The passages 43 and 44 open into the grooves 49 and 48 respectively, and the apertures 46 open into the groove 50. Intermediately of its length a collar 51 is formed around the cone 47 and its front portion is forwardly and inwardly inclined and has a plurality of longitudinal slots 52 extending rearward- -ly from its front extremity. In threaded engagement with the threaded portion of the flange 42 is an annular nut 53 by which the cone 47 is held in position. Centrally through the cone 47 an aperture 54 is provided in registry with the aperture 40 for the passage of metal wire. A plurality of concentric and inwardly inclined holes 55 are formed through the cone 47 which extend from the groove 49 to the front of the said cone. From the groove 48 other holes 56 are formed in the cone which connect with the holes 55 intermediately of their lengths wardly projecting flange 58 which is externally threaded to receive an annular tip 59 the front inner portion of which is tapered to correspond with the front tapered portion of the cone 47 around which it fits and forwardly from which the front extremity of the said tip projects; the rear portion of the bore of the tip is so formed that a space occurs between it and the cone 47 In front of the tip 59 an annular channel 60 may be formed.

The operation of the device is briefly as follows: Air under pressure is introduced to the underside of the opening 33 as by a flexible tube 61. Normally the plug valve 34 is so set that air may pass to the rotor 4 through the branch 35 and easing passage 2a. Thus the rotor is turned and by it the feed rollers 16 and 14 are driven. In this manner metal wire is fed through the housing apertures 20, and 19, through the aperture 40 in the rear nozzle member, and 1 through the central cone aperture 54. Simultaneously some of the air passes through the opening 33, pipe 39, cavity 45, apertures 46, annular groove 50 and flange openings 57 into the space around the periphery of the front portion 52 of the cone enclosed by the annular nut 53 and cone 59, from which latter it escapes along the longitudinal slots 52.

Meanwhile acetylene, or other suitable gas. entersthrough the tube 32, valve 30, and pipe 38 to the annular groove 48 and from the latter through the holes 56 into the holes 55. At the same time oxygen enters through the tube 31, valve 29 and pipe 37 to the annular groove 49, and from the latter into the holes 55. Thus in the lat ter intermediately of their length the acetylene, or its substitute, mixes with oxygen to form a combustible mixture which is dis charged through the tip 59 where it is ignited and melt-s the metal wire fed through the cone aperture 5%.

air passing outward through the tip 59 down the longitudinal grooves picks up the melted metal wire and sprays it against the work,

Thus the mixture of combustible gases occurs at such a location that all mixed gas is drawn forwardly by the suction created by the'air discharge so that the possibility of backtiring is virtually eliminated Again the plug valve 3% is so arranged that the flow of air to the rotor l may be varied without materially atl'ecting the air flow through the nozzle, thereoy providing means for regulating the speed of themetal wire feed; the arrangement of the valves 29 and 30 on the device itself also affords ready means for regulating the flame, The operating unit, so "ar as the nozzle itself is concerned, is carried entirely by the transverse member 25 and is readily removable "from the housing 1, and when so removed forms an operative structure provided the metal wire is hand fed through the apertures id and d' hile in the foregoing the preferred embodiment of the invention has been described and shown, it is understood that the construction is susceptible to such alterations and modifications as fall within the scope of the appended claims.

l hat we claim as our invention and desire to secure by Letters Patent is:

1. A nozzle for metal spraying comprising a rear nozzle portion having three separate passages termed therethrough one for the passage of air, a second for oxygen, the third for another gas, a cone the rear face of which is seated against said rear nozzle portion and has grooves formed therein one of which registers with each of said passages, means retaining said cone in position, and an annular tip extending forward from said retaining means, said nozzle portion and said cones having aligned apertures formed axially therethrough for the passage of metal wire the front extremity of which is adapted to be melted adjacent said annular tip, said cone having holes therethrough from one of its grooves openin into the space between said annular tip and said cone through which and air passes, said conehaving other holes extending longitudinally through its entire length from another of said grooves for the passage of oxygen, and said cone having a third set of holes therein extending from the third groove to the holes which extend through the entire length of said cone and terminating in the latter holes interinedia'tely of their length for the passage of gas to be mixed with the oxygen so that the oxygen and gas are directly induced into said tip from their points of mixture, said oxygen and gas being adapted to be ignited adjacent said tip to melt the wire as it is fed through the cone and the air bein ada ted to sure" the melted wire.

2. A nozzle for metal spraying comp a rear nozzle portion having three se apassages formed therethrough one for passage of air, another for oxygen and yeanother for a gas, a cone the rear face or? which is seated against said rear nozzle pen tion and has annular grooves formed therein one of which re "isters with each of said passages, an annular nut in engagement with said rear nozzle portion retaining said cone in position, and an annular tip extending forward from said nut and spaced from said con-e which it surrounds,-said rear nozzle portion and said' cone having aligned passages formed axially and centrally there through for the passage of metal wire the front extremity of which is adapted to be melted adjacent said tip, said cone having an annular arrangement of holes therethrough from one of its annular grooves opening into the space between said cone and said tip through which air passes, said cone having a second annular arrangement of holes extending longitudinally through its entire length from another of said annular grooves for the passage of oxygen, and said cone having a third annular set of holes therein extending from the third annular groove and terminating in the second set of holes intermediately of their length for the Hill passage of gas to be mixed with the oxygen 7 so that said oxygen and gas are directlyinduccd into said tip from their points of mixture, said oxygen and gas being adapted to be ignited adjacent said tip to melt the metal wire as it is fed through the cone, and the air being adapted to spray the melted wire.

ANDREW D. IRUNS. DUMllNlG L. /VALDUCK.

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