US32694A - Maetufacturietg tube-sheets fob - Google Patents

Description

IIIITED S WILLIAM S.

i. armati HUDSON, OF PA'IEPLSON, NIfHV JERSEY.

MANUFACTURING TUBE-SHEETS FOR BOILERS.

To all whom t may concern:

Be it known that I, IVILLIAM S. IIUDsoN, of Paterson, in the county of Passaic and State of New Jersey, have invented a new and improved mode of producing two or more grades of uniform thickness in a sheet of metal such as is required for tube sheets for boilers of locomotives and for other pui'- poses; and I do hereby declare that the following is a full and exact description of the same, reference being had to the accompanying drawings,

By the term two or more grades of uniform thickness in a sheet of metal I mean to describe metal sheets of such a form that one part of a sheet is uniformly of one thickness and another part is uniformly of another and different thickness.

The tube sheets `of locomotive and other similar boilers require to be thick at their upper parts where the tubes are united thereto and to be thin at their lower parts. Heretofore such form has only been produced by haimnering down the metal to produce the thin part while only the thick part could be rolled into the proper forni. The process of hammering is expensive and is liable for obvious reasons to produce a less perfect sheetthan does the process of rolling which latter is employed in my invention in the manner which will now be described.

Figure 1 represents a tube sheet of the character which my invention is designed to produce, it differing in no wise from others before known except that it is produced by rolling, so as to possess the proper thickness in all its parts, and at the same time to have the quality of cheapness and uniformity due to the rolling in coiitiadistinction to liaiiiiiiei'ing. Fig. 2 represents two sheets A and B of common or uniformly thick sheet metal. I apply them together in the manner represented and pass them in that condition through the rolls for the purpose of uniformly reducing the thickness of a portion of each without affecting the remainder. F G represents the same sheets reduced to the condition desired, A being the'thinned part of A, and B being` the thinned part of B. Figs. 3, 4, and represent tlie rollers C, D, with the sheets A, B, in the act of being passed through or of changing from one condition to the other.

rIhe thicknessv of both parts of the sheets A, B, is in practice much less (in comparison with the diameter of the rolls C D) than is represented in the drawings, the ratio being such that the bite of the rolls, C D, will readily seize and not repel the superposed plate A when in the position shown in Fig. Q.

To enable others skilled in the art to make and use my invention I will niinutely describe it as follows.

The sheets A, B, are first rolled iii the ordinary manner until the thickness proper for the thick portion obtains throughout the entire sheet. Two such sheets are now applied together in the manner indicated and again passed through the rolls. In this latter operation the action of the rolls reduces only that Vpart of each which is opposite to the other, to wit: the parts A and B in Figs. 5 and G, leaving the projecting parts A 'and B, or the parts not thus lapped upon each other, unreduced and entirely unaffected by the operation.

I am aware that it has been heretofore proposed to give au irregular forni to a bar or sheet of iron by placing with it a counterpart of the form required, and passing both together through the rolls, but in such case the counterpart or mold is not compressed, it serving only to give form to the article. My invention differs from the above in the important particular that I place two similar pieces together, having both at the same degree of plasticity, and each serving as the mold for the other, both being reduced equally, and the result being the production of two sheets by the same operation which previously produced but one. Beyond the obvious economy resulting from this double production there is another advantage in my method over that above described, in the fact that as both pieces are of equal plasticity, botli are elongated together, and therefore there is no slipping of one upon the other and thus iinpairing the surface, or bending of either or both, as there is where one cold and one hot plate ai'e used together.

My invention is applicable to the manufacture of iron or copper or other metal sheets, and to the working thereof at any degree of temperature in which the metal can be prei eily reduced by rolling.

Ilaving now fully described my invention what I claim as new therein and desire to secure by Letters latent is- The within described method of lnfoducing a rolled metal sheet one part of which is uniformly of one thickness and another aart In testimony whereof I have hereunto set of which is uniformly of another und di ermy name in the presence of tWo subscribing 10 ent thickness; that is to say, first rolling the Witnesses.

entire sheet to the thickness required for the thick portion, and afterward rolling tWo WVM' S' HUDSON' sheets with the portions required to be thin- `Witnessesz ner superposed one upon the, other Substan- ROBERT S. HUGHES,

tiully as herein Set forth. JAMES C. CHRISTIE.

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