US529617A - Stirring-in or mixing device - Google Patents

Description

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" W. H. HOWARD.

STIR'RING IN 0R MIXING DEVICE.

No. 529,617. Patented-Nov. 20, 1894.,

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NITED STATns NVILLIAM H. HOWARD, OF PUEBLO, COLORADO.

STIRRING-IN OR MIXING DEVICE..

- SPECIFICATION forming part of Letters Patent N o. 529,617, dated November 20, 1894.

Application filed April 5, 1894. Serial No. 506,458- (No model.)

To all whom it may concern:

Be it known that I, WILLIAM H. HOWARD, of Pueblo, in the county of Pueblo and State of Colorado, have invented a new and Improved Stirring-in or Mixing Device, of which the following is a full, clear, and exact description.

The invention relates to the process of alloying the silver contained in molten argentiferous lead, with zinc; and its object is to provide a new and improved device for conveniently and thoroughly mixing the zinc with the molten argentiferous lead, and without danger of oxidizing and rendering the zinc inert, as is so frequently the case with the means heretofore employed'.

The invention consists of certain parts and details, and combinations of the same, as will be fully described hereinafter and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming part of this specification, in which similar letters of reference indicate corresponding parts in both figures.

Figure l is 'a transverse section of the improvoment as applied; and Fig. 2 is a side elevation of the improvement.

The pot A into which iows the molten argentiferous lead from the furnace, is adapted to be closed by a cover or lid B, formed on its under side with au annular flange B passing into the molten lead, so as lto seal vthe same, to prevent atmospheric air from passing into the pot A. The cover B is supported by chains C from a hoisting deviceDof any approved construction, connected with a traveling carriage E adapted to move forward or backwardso as to move the cover B from one pot A to another.

On the under side of the cover B is arranged a cylinder F extending a suitable distance into the molten argentiferous lead, as is plainly illustrated in Fig. 1, the said cylinder being supported by suitablerods or bars F, bolted or otherwise secured to the under side of the cover B. In this cylinder F is mounted to revolve a stirring device G,.pref erably made in the shape of a propeller wheel secured on a propeller shaft G disposed vertically and passing through the cover B and p a stuffing box H, attached to the top ofv the said cover, as is plainly shown in Fig. 1, so as ing of 'the silver with the said zinc.

to prevent atmospheric air from passing into the pot A after the cover B is placed on top of the pot.

The shaft G is journaled Iin suitable bearings in a frame-work I secured to the top of the cover B, and on said shaft is fastened a bevel gear wheel G2 in mesh with a bevel gear wheel J secured on alongitudinally extending shaft J, journaled in suitable bearings i'n the said frame I. On the shaft J is arranged a driving pulley J2 connected by aV belt K with a pulley K on a shaft K2 driven from suitable machinery, so that when the said belt K connects the pulley K with the pulley J2, then the said shaft J is rotated and its rotary motion is transmitted by the gear wheels J and G2 to the propellershaft G', so that the propeller wheel forming the agitating device G is rotated within the cylinder F. As the latter is open at the top and bottom, the molten metal in the pot A is stirred up, to completely mix the zinc with the molten argentiferous lead, to insure a perfect alloy The operation is as follows: When the pot A is charged with the argentiferous lead, then Athe cover B is brought over the said pot A by as indicated in Fig. 1, and then the cover B is lowered by the hoisting device D until it extends to within a few inches of the top surface of the said pot A. At this time the zinc bars are slipped into the pot A below the lower surface of the cover B, and then asmall quantity of crude oil a is scattered over the surface of the lead contained in the said pot A. The oil ignites by comingin contact with the molten metal, and it burns out the oxygen contained in the air between the surface of the molten lead in the pot A and the under side of the cover B,thus forming an inert gas between the top surface of the molten metal and the under side of the cover B. The latter is then immediately lowered and clamped or otherwise fastened to the pot A, whereby the wholesurface of the lead is completely sealed from outside air. Connection is then made by the belt K between the pulleys K and J 2, so that the stirrer G is rotated in the molten metal to agitato the molten argentiferous metal and mix the latter with'the zinc, which is, by this time, melted, so that finally IOC the silver contained in the argentiferous lead alloys with the zinc, without the latter coming in contact with any particle of the atmospheric air. By this process less zinc is required, as none of it becomes oxidized when stirring and mixing it, and the product of silver zinc alloy finally produced is in a far better shape for the subsequent operation of liquation, as it parts more readily with its mechanically combined lead.

It will further be seen that considerable time and labor is saved by the process described, as the stirring and mixing is done by the mechanically driven stirrer G instead of by hand with ladles, as heretofore practiced.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patentl. A stirring or mixing device, comprising a cover formed on its under side with an annular iiange adapted to pass into molten argentiferous lead contained in a pot upon which the cover fits, and a stirring device held on the under side of the cover and arranged to pass into the lead, substantially as described.

2. A stirring or mixing device, comprising a cover formed on its under side with an annular flange adapted to pass into molten argentiferous lead contained in a pot upon which a cover tits, and a stirring device held on the under side of the cover and arranged to pass into the lead, the said stirring device comprising a cylinder open at the top and bottom and supported by brackets from the under side of the said cover, a propeller Wheel mounted to rotate in the said cylinder and means for imparting a rotary motion to the shaft, of the said propeller Wheel, substantially as herein shown and described.

3. Inastirring or mixing device of the character described, the combination with a travcling carriage, of a cover for the pot containing the material to be stirred or mixed, a stirring device carried by the cover, and a hoisting device connected with the cover and" carriage, substantially as and for the purpose set forth.

4. -In a stirring or mixing device ofthe character described, the combination With a pot, and a traveling carriage arranged above the pot, of a flanged cover for the pot, a cylinder open at top and bottom and suspended from the cover, a stirrer in the cylinder having its shaft mounted in the cover, means for operating the stirrer, and a hoisting device connected with the cover and carriage, substantially as described.

WILLIAM H. HOWARD.

Witnesses:

H. G. WILLIAMS, W. W. COOPER.

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