US644575A - Galvanizing apparatus. - Google Patents

Description

No. 644,575. Patented Mar. 6, I900. E. l. BRADDOCK.

GALVANIZING APPARATUS.

(Application filed Nov. 14, 1899.)

(No Modal.)

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EDWARD I. BRADDOCK, OF W'INCHESTER, MASSACHUSETTS, ASSIGNOR TO THE NEW PROCESS COATING COMPANY, OF PORTLAND, MAINE.

GALVANIZING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 644,575, dated March 6, 1900.

Serial No. 736,911- (No model.)

To M6 whom it may concern:

Be it known that I, EDWARD I. BRADDOOK, a citizen of the United States, residing in Winchester, in the county of Middlesex and State of Massachusetts, have invented an Improvement in Galvanizing Apparatus, of which the following description, in connection with the accompanying drawings, is a specification, like letters and figures on the drawings representing like parts.

This invention relates to an apparatus for galvanizing metal strips, sheets, plates, Wires, netting, &;c., and has for its object to provide an apparatus with which a light, smooth, clean, and uniform coating may be obtained at a minimum expense. For this purpose I employ an apparatus comprising an outer vessel, a smaller inner vessel located within the outer vessel to form a continuous passage beneath said inner vessel through which the metal strips are passed continuously in one direction and to leave a space above it which is filled with galvanizing metal, and a partition-wall extended above the inner vessel, at one side thereof, to separate the upper part of the outer vessel into two chambers, one of which forms an entrancechamber for the continuous passage between said vessels and the other of which communicates with said passage and with the inner vessel also. The continuous passage is designed to contain a bath of lead or its alloys, which bath extends up into the entrance-chamber for said passage, and the inner vessel and the chamber above it are designed to contain galvanizing metal, either zinc or its alloys.

With the apparatus above described the metal strip to be galvanized is first passed into the bath of lead or its alloys without making contact with the zinc, thereby avoiding waste of galvanizing metal by spattering, and is then passed out of the bath of lead and through a layer or bath of zinc or its alloys resting on the lead, thus limiting the contact of the iron or steel strip with the zinc or its alloys, and consequently reducing the amount of dross formed, which as it accumulates is removed by overflowing into the inner vessel.

Figure l is a transverse section on'the line 1 1, Fig. 2, of an apparatus embodying this invention; and Fig. 2, a longitudinal section of the apparatus shown in Fig. 1.

The apparatus shown in the drawings comprises an outer kettle or vessel d and a smaller inner vessel j, suitably supported within the 5 5 vessel d, as by straps or hangers 10, so as to form a continuous passage h between said vessels and to leave a space above said inner vessel. The vessel d is provided with a partition-wall 6, extended the length of the kettle 6o d-and downward from its upper edge for a portion only of the depth of the said vessel to form chambers a b, the chamber a forming an entrance to the passage h and the chamber b communicating with the outlet end of the passage h and also with the inner vessel j.

The passage h is designed to contain a bath of molten lead or its alloys 4:, which fills the passage on its outlet side up to the level of the upper edge of the inner vessel j and which extends up into the entrance-chamber a above the level of the upper edge of the inner vessel, due to the weight of a layer or substantially-shallow body 0 of zinc or its alloys,

which fills the vessel j and rests on the lead in the outlet end of the passage h, and in the present instance the zinc-bath 0 rest son a portion of the lead between the partition-wall e and the vessel j.

With the apparatus shown in the drawings the strips, sheets, &c., of iron or steel to be galvanized, after being fiuxed, are first passed into the entrance-chamber a and through the passage h, and by reason of the heavy spe cific gravity of the lead no loss of metal 00- curs by spattering or flying when the Wet iron or steel enters the molten lead, as is the case if the wet iron first passes through a layer of zinc resting on the lead. The iron or steel strip, 850., continues on in its passage through the bath of lead or its alloys and passes up. through the layer of zinc or its alloys resting on the lead in the outlet end of the passage h. The dross formed by contact of the iron vessel j. The amount of dross through which the iron or steel strip is passed is thus reduced to a minimum, which results in the galvanized metal being smoother and cleaner.

The dross accumulated in the vessel j acts to automatically feed the zinc in said vessel to the chamber 1), and the said dross can be removed without interfering with the galvanizing process.

By means of the chamber a a very considerable saving in galvanizing metal is effected, and by means of the overflow vessel j a superior galvanizing effect is permitted by the removal of the dross.

I have herein shown the partition-wall e as separate from the inner vessel j,- but it is evident that it may be made as an extension of one side of said vessel. It will be understood that the kettle or vat may be of any desired shape and size and in practice is heated to keep the metals molten.

I claim A galvanizing apparatus comprising an outer vessel, a smaller inner vessel located therein to form a continuous passage from one side of said outer vessel to the other, and to leave a space in the outer vessel above said inner vessel, and a partition-wall at one side of the inner vessel extended upward above the level of the upper edge of one side of said inner vessel to separate the space in the outer vessel above the inner vessel into two chambers, substantially as and for the purpose specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

EDWARD I. BRADDOOK.

\Vitnesses:

J AS. H. CHURCHILL, J. MURPHY.

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