US1151586A - Apparatus for melting and spraying fusible substances. - Google Patents

Description

F. HERKENRATH.

APPARATUS FOR MELTiNG AND SPRAYING FUSIBLE SUBSTANCES.

APPLICATiON FILED MAR. 21,1914.

1,151,586, Patented Aug. 31, 1915.

- UNITED STATES PATENT ornrcn.

FRANZ HEBKENRATH, 0F ZURICH, SWITZERLAND, ASSIGNOR, BY MESNE ASSIGN' MENTS, TO METALS COATING COMPANY OF AMERICA, 015 BOSTON, MASSACHUSETTS,

A CORPOBAATIQN OF MASSACHUSETTS.

' APPARATUS FOR MELTING AND SPRAYING- FUSIBLE SUBSTANCES.

To all whom) it may concern Be it known that I, FRANZ HERKENRATH, a citizen of the German Empire, residing at Zurich VI, in Switzerland, have invented certain new and useful Improvements in Apparatus for Melting and Spraying Fusible Substances, of which the following is a specification.

The object of this invention is to provide improved means for melting and spraying fusible substances, such as metals, for the purpose of coating surfaces therewith.

To this end I use a stream of heated gas, in the path of which Iplace the fusible substance, the temperature vof the gas being sufliciently high to melt the substance. The function of the gas is thus in part analogous to that of the blow pipe flame used in some forms of the so-called-Schoop process, but

the gas also has a propulsive effect-on the molten substance, and thus effects the spraying, or assists in that operation. In general I find it more economical to use, in addition to a stream of heated air or other gas, whereby the substance is melted, a blast "device acting in conjunction with the said stream of gas- I Four ' for carrying this improved method into effect are shown in the accompanying drawing, in Figures 1, 2,- 3 and 4: respectively,

parts of the apparatus in all the views being shown in sectlon. 1

Referring in the first instance to Fig. 1, a designates a coiled tube of electrically conductive but resistant material, and b. afeed 7 pipe through which a stream of gas is'supphed to the table: a, so that'the gas issues from the tube-rat 0. Around the discharge end a of the tubeo, and concentric thre-' with, is an annular blast nozzle d, to which I a stream of gas is fed throu ha pipe 6.

Electric currentis fed throug the tube a by means of wires w and heats the said tube sufficiently to raise the gas therein to thetemperature required for melting a rod or wire f of the fusible substance held in front of the nozzle and fed forward through a guide 9 at the rate required.

In the modification shown in Fig. 2' a tube a of refractive material incloses an electric resistance 6 through which current is fed by means of wires ota 2 A stream of Specification of Letters Patent.

embodiments of apparatus suitable Patented Aug. 31, 1915.

Application filed March 21, 1914. Serial No. 826,137.

gas is fed into the tube a by means of a plpe b and passes out through a short pipe 6 the discharge end of which is surrounded by an annular blast nozzle al The stream of gas flowing through the tube a is heated l by the resistance 6 to the temperature requlred for meltin the fusible substance.

In the modification shown in Fig. 3 a tube a of refractive material such as carbon,

graphite, carborundum or the like is partly inclosed by a metal tube 6 into which a stream of gas is fed through a pipe I). The tube a which projects at 0 from the tube 6 is electrically insulated from the latter by collars m, n, and by a holder is which embraces the inner end of the tubeo. and is movable in the tube so that the tube a can freely expand. The holder is has ducts d terminating, inside the holder at orifices in the wall of the tube a so that the stream of gas fed through the pipe I) into the interior 1' of the tube 6 passes through the ducts d into the tubea and is discharged from the latter outside the tube 6 The outer end a of the tube a is surrounded by an annular blast nozzle d Electric'current is fed through the tube 0. by means of wires to and connections w so that the tube becomes hot and heats the gas passing therethrough to the required temperature. A

temperature of 2000 C. can easily be ata of fire-clay or other refractive material is filled with-a granular heat conducting mass b, for example with particles of carbon, the interstices of which are adequate to give passage to a stream of gas fed into the tube through a pipe b and discharged through a nozzle a arranged in proximity to a guide 9?, through which a wire f of the substance to be melted and sprayed is fed. The'tube a and the granular carbon therein are heated by a burner 16. Combustible or-non-combustible gas may be used, and acquires reducing properties by contact with the car bon in the tube a Withthe appliances shown in Figs, 1, 2 and 3, I preferablyuse' gases of a chemically neutral or reducingvquality in order to prevent oxidation of the electric conductors and of the substance melted.

What I claim as my invention and desire to secure by Letters Patent of the United States is l 1. An apparatus for producing a hot gasblast for melting and spraying fusible substances which comprises a gas-conduit having a discharge orifice, means to heat said con-' duit above themelting point of said fusible substance, a gas-holding member partly surrounding said conduit, the discharge orifice of said conduit being outside said gas-holding member, and means for supplying gas 7 under pressure to said conduit and said gasholding member.

2. An apparatus for producing a hot gas-- ing a discharge orifice, an. electric heating device to heat said conduit above the melting point of said fusible substance, a gas-holding member partly surrounding said conduit, the discharge orifice of said conduit being outside said gas-holding member, and

means for supplying gas under pressure to said conduit and said gas-holding member.

4. An apparatus for producing a hot gasblast for melting. and spraying fusible substances which comprises a gas-conduit having a discharge orifice, an electric heating device to Heat said conduit above the melting point of said fusible substance, a tube closed at both ends partly surrounding said conduit, the discharge orifice of said conduit being outside said tube, and means for supplying gas under pressure to said conduit and tube.

5. An apparatus for producing a hot gasblast for melting and spraying fusible substances Which comprises a gas-conduit of electrically conductive material having a discharge orifice, means for feeding an electric current to and from said conduit to heat same, a tube closed at both ends partly surrounding said conduit, the discharge orifice of said conduit being outside said tube,

and means for supplying gas under pressure to said conduit and tube.

In witness whereof I have signed this specification in the presence of two witnesses.

FRANZ HERKENRATH.

Witnesses 7 PAUL 'ZOLLER, CARL SUBEG.

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