US177635A - Improvement in cast-iron sectional boilers - Google Patents

Description

2 Sheets-Sheet 1 I. W. HARD.

CAST-IRON SECTIONAL BOILAER. No.177,635. f Patented May 23,1876.

INVENTOR N.PETERG. PHOTO-UTHOGRAPMER, wAsmNGToN. D C.

ZSheetS-SheetZ. J. W. HARD.

v CAST-IRON sEcTIoNAL BOILER. y

N0.177.'635. f Patented May 23,1876.

wmvesses v. v INVENTOR, @1w/ jg UNITED STATES PATENT EEICE.

JOHN W. HARD, OF DEOORAH, IOWA.

IMPROVEMENT IN CAST-IRON SECTIONAL BOILERS.

Specification forming part of Letters Patent No. 17,635,` dated May 23, 1876; application tiled n February 19, 1876.

To all whom it 'may concern Be it known that I, JOHN W. HARD, of Decorah, in the county of Winneshiek and State of Iowa, have invented a new and valuable Improvementin Cast-Iron Steam-Boilers; and

v boiler, and Fig. 2 is a plan View thereof. Fig.

3 is asectional detail view.

The object of my invention is to improve the construction of steam-boilers, as will be hereinafter more fully set forth.

-In the annexed drawings, A represents thev base of my boiler, constructed in any suitable manner to contain the dre-box and ash-pit.- On the interior of thebase Aare suitable lugs or anges a a, to support the boiler. The boiler is made in sections, each section consistin gef a circular tube, B, horizontally divided into halves, with two tubular arms, C O, similarly divided, crossing each other at right angles in the cen- Y ter. The tube B is cast with hollow bosses b I), at suitable intervals, on top `and bottom,

and a central hollow boss, d, is also cast at `top and bottom, at the intersection of the arms (J O, as shown.

Each section thus constructed is cast in two parts with suitable flanges, to be bolted firmly together. As many of these sections as may be desired are placed on top of each other, the bosses corresponding, as shown, and long bolts h passed through, and the sections then fastened together by nuts z' on the ends of said bolts.

1t will be seen that, by this construction, each section forms four triangular openings for the passage of the products ol' combustion, and in fastening the sections together they should be turned in such a manner that the tubes Cof each section should be directly over the spaces between the tubes of. the, section immediately below. This is fully shownV in Figs. 2 and 3. In adjustingv the sections of 'the boiler the center collars d act as turn-tables upon which the sections can be turned properly.

By this construction of the sections B I am able to cast an entire section without the use of sand-cores.

The feed-water is to enter at the bottom,

and the steam taken out at the top, in .the

usual manner. n

The boiler is surrounded by a wrought-iron jacket or shell, D, supported upon the base A, and formed with a smoke-outlet, E, at the top. Between the shell D and every alternate section of the boiler is placed an annular plate,

m, to close the space between them, and on the other sections are placed plates n. to close the spaces between the arms O, as fully shown in Fig. l.

By this means, it will be seen, the products of combustion are caused to take a zigzag course-t'. e., from the outside inward, and

from the center outward; or, in other words, theyrst pass around the outside of the irst section, and, meeting the annular plate m around the second settion,vthey are deflected inward .and pass through the inside of the second section; then, meeting the center plates n ofthe third section, they are deected outward and pass around the outside of said third section, and so on to the top.

What I claim as new, and desire to securel l JOHN w. HARD.

Witnesses GHAs. WALno, J oNATHAN MILLS.

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