US39398A - Improvement in blow-pipes - Google Patents

Description

J. S. HULL. BLOWPIPB.

No. 39,398. Patented Aug. 4, 1863..

UNITED STATES PATENT OFFICE.

.JOHN s nULL, or CINCINNATLOHIO.

iMPPtovi-:MENT IN BLOW-PIPES.

To all whom/it may concern.-

Be it known that I, JoHN. S. HULL, ot Cin- 'cinnati, in the county of Hamilton and State of Ohio, have invented a newand Improved Blow-Pipe; and I do hereby declare that theI followin gis afull an d exact description thereof, reference being had to the accompanying drawings, making part of this specification.

Figure lis a side elevation ofthe improved blow-pi pe complete Fig. 2, a longitudinal vertical section of the condensing or pressure reservoir; Fig. 3, avertical section showing the construction of the cut-oitl or jet regulator.

Like letters designate corresponding parts in all of the figures.

Alcoholic b1ow-pipes as heretofore -constructed have a close boiler, in whichthealalcohol before the blow pipe can commence to operate, and of the employment of aseparate lamp or hea-ter'therefor, and from theliability of explosions, unless the expense ot' a sure safety-valve is incurred.

'lhe leading features of my invention consist in applying simple atmospheric pressu re to the supply-fountain, so as to force the liquid alcohol itself instead of its vapor through the j etpipe, and in i-aporizingit in small, continuous quan' tities in the jet-pipe itselfl near its extremity; whereby all the disadvantages above enumerated are ob\*iated,and real advantages are also attained, substantially as hereinafter set forth.

I employ an air-tight reservoir, A, of any suitableshape and material, to hold the alcohol (or other equivalent liquid for the purpose) `for supplying the jet; but it is necessary that this rescrvoirshould be only-partially 'lled with the alcohol-'fsayone-halt' or twoabove that line. rlhe iillingcap or stopper T should, oi course, bc packed, as at n, or lotherwise be made to fit air-tight. To this reservoir is attached an air-pump or condenser, which is conveniently and efficiently constructed as follows:

In the reservoir is secured a close tube or pump-barreh M, of the required length, and havin g a separate chamber, is, in its inner end, or another tube, N, inside ot' the same, as shown in Fig. 2. These tubes are fastened airtight in the reservoir by a screw-joint, n, cap fm, and packing 7c,.or. their equivalent. From the inner end a tube or nozzle, if necessary, aseends above the surface of the alcohol. .l n

Athe inner end of the tube or barrel N is located a valve, Q,of conical or other suitable forni, closing outward into its seat It by a spring, i', and by the pressure of the air within the reservoir, and opening inward by the pressure ot' the air in the barrel when condensed by the forcing forward of the piston.

The piston Pis best and surest in action when made solid and in order that a valve may be dispensed with., it is drawn backward at each stop to the mouth ofthe barrel, or behind orifices ofso that air can enter in front of it when in that position. A cap, l, serves to .prevent the pistons being drawn entirely out ofthe barrel.

The alcohol is le'd from the reservoir A Iirst through altube, t, Fig. 2, which reaches from near the bottom, so as to receive the liquid till nearly drained from `the reservoir, and cond-ucts it into an intermediate connecting-port, l). This port is provided with a pivot-joint, d, tightened wlth a screw, f, and-packing e, so that thejet-pipe'C may be turned horizontally in any desired direction.

In the upper endoi the port D is situated a stop-cock for cutting off and regulating the flow ot'alcohol through the jet-pipe l. constructit substantially as represented in Fig. 3,

The passage between the port l) and the opening li to the jet-'pipeis conical, and stopped by screwing the accurately-fitting conical end got' the cock i into it. rlhe nut I, in which the cock i turns, is also a tightening-cap, which screwsinto the supporting-socket or barrel L, and compresses a packing-block, j, (made of india-rubber, leather, cork, or other suitable elastic matcriah) and not only tightly packs it against the bottom and sides otthe cavity, but around the cylindrical body ot' the cock z' itself. The flow of liquid is regulated by turningihecocki, and the packin g is tightened byturning the milled head of the nut I.

Thejet-pipe U is made as usual, except that provision is made for heating it near its extremity, to vaporize the liquid alcohol as it passes through. For this purpose theblowpipe lamp B has not only the ordinary llameburner, H, but a heating-burner,.G, arranged so as to throw its llame against the jet-pipe.

In order to render the vaporization more rapid and effectual, I usually make a coil or turn, c, in the 'jet-pipe, over the burner G, so as to present algreater length and surface to its heat.

Thus, by simply operating the pump in the reservoir occasionally, so as to condense the air therein, andlighting the lamp B at the tv vo burners G H, thebloW-pipe is ready for operation at once, and continues in operation as lon g as desired Without heating the alcohol in the reservoir. It is perfectly controllable, and works exceedingly Well, being-capable of adjustment with great nicety. All the advantages designed by it as set-forth above are ob- .forcing the same in a liquid state through the jet-pipe, 'and vaporizingit therein just beforeif;-

issues therefrom, substantially as and for the purposes herein specified. 1 In Witness that the above is a complete and exact description of my improved blow-pipe, so as-to enable those skilled in the art to make and use-the same, I hereunto set my hand this 10th day of December, 1862.

. JOHN S. HULL. Witnesses:

J. S. BROWN, ZENAs CLEMENT.

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