US696548A - Assaying-furnace. - Google Patents

Description

4 Patented Apr. I, |902. A. C. CALKINS.

ASSAYING FURNACE.

(Application Bled Feb. 5. 1901.)

2 Sheets Sheet I.

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(No Model.)

W/ TNE SSE S A. C. CALKINS.

ASSAYING FURNACE .Application led Feb. 5, 1901.;

Patented Apr. l, |902.

2 Sheets--Sheetv 2.

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ALBERT OIIAMPLIN OAIJKINS, OF LOS ANGELES,'OALIFORNIA, ASSIGNOR TO FREDERICK W. BRAUN, OF LOS ANGELES, CALIFORNIA.

ASSAYlNG-FURNCE SPECIFICATION forming Dart Of Letters Faten No.. 696,548, dated April 1, 1902.

Application led February 5,1901. Serial No. 46,049. (No model.)

To all whom t may concern.-

Be it known that I, ALBERT CHAMPLIN OALKINS, residing at Los Angeles, in the county of Los Angeles and State of California,

have made certain new and useful Improvements in Assaying-Furnaces, of which the following is a specification.

My invention is an improvement in the class of assayers furnaces which are adapted for ro use of gas or a volatizable hydrocarbon as a heating medium. It is more particularly a combined muiiie and melting-furnace, and anV improvement upon, or in the same line as, those covered by the patents of J. J. Louer- :5 gan and A. C. Oalkins, No. 608,883, and G. NV. Martin and A. J. Petter, No. 635,586.

The features of improvement and novelty are as hereinafter described, and shown in accompanying drawings, in whichzo Figure l is a perspective view of my improved furnace, part being broken away to show interior construction. Fig. 2 is a central vertical transverse section of the furnace. Fig. 8 is an elevation of one end of the central portion of the furnace. Fig. i is an end view of one longitudinal half and a Vertical section of the corresponding half of the furnace. Fig. 5 shows a modified construction. The furnace has two main divisions-to wit, 3o the central portion A, containing the muffie l, and two side crucible-chambersB B, which are similar in form, construction, arrangement, and operation. The sides of the furnace are incased by sheet or cast metal,which l 3 5 extends below the fire-brick and is provided with Ventilating-openings. Themuiiie is arranged. transversely of the central part A and traverses a combustion-chamber 2, having a side opening 3 for introduction of a suitable 4o gas or hydrocarbon burner. (Not shown.) From such combustionchamber 2 a iiue et (see Fig. 2) leads to the bonnet O, which is constructed of sheet metal and set and held detachably upon the top of part A. The front end of the muiiie l is entirely open, and the rear or inner end has an opening 5, which communicates with a passage 6, extending through the rear end wall of the furnace portion A. The said passage 6 is guarded by a 5o pivoted drop cover or valve 7 and serves as an inspection-opening and for admission of air as may required for the best results in oxidation and reduction.

From the front end of the muiile l a passage 8 (see Figs. land 2) leads upward, it be- 55 ing formed in the end of the arch of the combustion-chamber 2, and, like the main flue 4., it leads direct into the bonnet C. This passage 8 may be closed by the plug or block 9, which is adapted to fit and slide in a hori- 6o zontal passage formed in the front wall of part A, in alinement with the muifle l. The said plug 8 is adapted to slide in a hood 9, having a bottom shelf or bracket wherein the plug rests, as shown. Thus when pushed in against the end of the mu'lile 1, as shown by dotted lines, Fig. 2, it closes or shuts off the passage 8, and when drawn out, as shown in full lines, the said passage 8 is left free or open. 7o

It will be understood that the air for oxidining the charge in the muffle is admitted through the passage 6 in the back of the furnace A and that a draft through the front passage 8 is induced by the draft in the main 75 iiue A. Thus the draft through the mufiie l may be perfectly regulated and any desired amount of oxygen may be supplied, as the conditions of the cupeling operation require.

As shown in Figs. 2 and A, the central com- 8o bustion-chamber 2 has wide lateral passages l0, that lead into the side crucible-chambers B. Each of the latter has a base which may be formed wholly or in part of iireclay ll, whereon crucibles or melting-pots are set, as shown by dotted lines, Fig. 4. A bottom slide 13 provides for convenient removal of the clay. In use the flame and heated gases pass from the central and main chamber 2 through passages l0 into the side 9o chambers B, which serve practically as combustion-chambers, wherein the crucibles are exposed to a practically uniform heat.

It will be noted that the bottom of the combustion-chamber 2 is iiush with that of the 95 side or Crucible chambers B, as shown in Fig.

4.. This allows crucibles to be placed in the space beneath the arch, as well as in chambers B, proper. The latter may be provided roo with covers 12, arranged horizontal, as shown in Fig. l; but my preferred construction and arrangement are shown in Fig. 5, wherein the central arch of the furnace is shown extended laterally over the Crucible-chambers B, and the latter are provided with a cover or door 12, consisting ot' a block fitted into a longitudinal opening and supported by the converging sides or angles of such opening. Through the latter access is had to the crucible-chamber for convenient insertion or removal of crucibles. It Will be seen that by this extension of the top arch over the crucible-chambers B and the extension of the Iioor of the latter flush with that of the combustion-chamber 2 I am enabled to lessen the Width of the furnace as compared with the form shown in Fig. it Without decreasing its capacity for holding crucibles.

It is apparent that one of the chambers B may be used for clean assay-Work while the other is being used for melting bullion.

What I claim isl. The improved assaying-furnace comprising a combustion-chamber having a main top liue, a mufde arranged horizontally in said chamber and having its front end open, and its rear end provided with an air-inlet and a device for regulating admission of air thereto, means for temporarily closing the front end of the muffle, and a supplemental flue or passage leading up from such end of the mutle, substantially as shown and described.

2. The improved assayin g-fu rn ace comprising a combustion-chamber having a main top iue, a muftle having its front end open, a supplemental iue or passage leading up from such end of the mufe, and a removable plug adapted for closing both the muflie and said passage, substantially as shown and described.

The improved assaying-furnace, comprising a combustion-chamber having a main escape-flue and a bonnet therefor, a mule which traverses the said chamber and is open at each end, passages in the side Walls of the furnace which communicate with the muftle, a passage leading upward from one end of the muffle and connecting with the main flue, a plug for closing the passage and the adjacent end of the muflle, and a valve for closing the opposite end of the muflle, substantially as shown and described.

4. The improved assaying-furnace comprising a central combustion-chamber, having a fire-opening, a muil-le which traverses the chamber above such opening, Crucible-chambers located on each side of the main chamber, and lateral passages connecting the three chambers, the latter being provided with removable covers, substantially as shown and described.

ALBERT CHAMPLIN CALKINS.

Vitnesses:

SIDNEY J. PARSONS, TREVITT WV. OKEY.

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