US533536A

US533536A - Steam-boiler

Info

Publication number: US533536A
Authority: US
Publication date: 1895-02-05
Anticipated expiration: 1912-02-05

Description

(No Model.)

J. HUGHES.

STEAM BOILER.

No. 533,536. Patented Feb. 5, 1895.

UNITED. STATES PATENT @FMQE.

JAMES HUGHES, OF SORANTON PENNSYLVANIA.

STEAM-BOILER.

SPECIFICATION forming part of Letters Batent No. 533,536, dated February 5, 1895.

Application filed November 23, 1893. Serial No: 491,771. (No model.)

To aZZ whom it may concern:

Be it known that l, J AMES HUGHES, of Scranton, in the county of Lackawanna and State of Pennsylvania, have invented certain new and useful Improvements in Steam-Boilers; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this Specification, and to the letters of reference marked thereon.

The object of the invention is to provide a new and improved boiler, more especially designed as a locomotive boiler and which is simple and durable in construction and in which the tube sheet and leg sheet are protected and preserved against differential expansion and contraction of the boiler shell and tubes.

The invention consists of longitudinally ex tending braces connecting a flange on the leg sheet with the shell of the boiler.

In the accompanying drawings: Figure l is asectional side elevation of the improvement. Fig. 2 is an enlarged sectional elevation of part of the improvement. Fig. 3 is a transverse section of the same on the line w-az of Fig. 1, and Fig. 4; is a sectional plan view of the same on the line yy of Fig. 1.

In boilers as heretofore constructed, the rapid destruction of the tube sheet and leg sheet which form the front end of the furnace is mainly caused by the unequal expansion and contraction of the boiler shell and tubes. The longitudinal expansion and contraction of the tubes is quicker than that of the boiler shell, so in expanding they thrust against the tube sheet. leg sheet the same force is applied to the leg sheet as the two sheets form the inner end of the fire box. The tubes in contracting pull these sheets with them. This movement goes on continually, more so when the fire is in the fire box and the door is opened and closed. The tube ends in the fire box first show signs of weakness by their leaking and have to be ealked from time to time, until taken out to have new ends put on and placed in the boiler again to perform the same work. The tubes which usually first fail are those in the lower half of the tube sheet where the latter has the least support. To overcome the above men As the latter is connected to the tioned difficulties is the object of the inven tion presently to be described.

The boiler is formed with the usual boiler shell A, the fire box B formed at its inner end with the tube sheet G connected in the usual manner by the tubes D with the front tube sheet E. The inner leg of thefire box Bis provided with the usual inner leg' sheet F formed with aflange G, riveted or otherwise secured to the flange on the tube sheet 0. From the flange G extends outwardly beyond the face of the tube sheet 0, a flange H, connected with a series of braces I extending longitudinally in the boiler shell A and secured at their outer ends by rivets or other means to the interior surface of the boiler shell A, as is plainly illustrated in the drawings.

The tubes D are not arranged at right angles to the tube sheets 0 and E but are set at angles thereto so that the longitudinal expansion of the tubes will not exert a square pressure against the tube sheet, whereby in expanding they bend without trying to force themselves through the apertures in the tube sheet, as is the case if the said tubes are at right angles to the tube sheet.

In forming the extra large flange H on the flange G, of the leg sheet F, the said leg sheet is made stronger and consequently more self sustaining in resisting and maintaining the tube sheet against the expansion of the tubes.

The brace or braces I are made sufficiently strong so as to hold the tube sheet C in place, thereby forcing the tubes D to bend when expanding.

Having thus described my invention, what I claim as new is-= I 1. Aboiler provided with aleg sheet formed with an additional flange extending beyond the face of the tube sheet and connected with the said leg sheet, and the stay bolts connecting the extended flange with the boiler; substantially as shown and described.

2. In a boiler, the combination with the tube sheet provided with a flange, the leg sheet provided with a flange and secured to the flange of the tube sheet, of a flange extending from the flange of the leg sheet outwardly beyond the face of the tube sheet, and one or more braces connected at one end to said additional flange and extending longitudinally into the boiler and secured to the boiler shell, as and tendinglongitudinallyand conneotedwith the I for the purpose set forth. said flange and with the saidboiler sheet; sulow 3. In a boiler, the combination with the stantially as shown and described. boiler shell, of tube sheets held in the said JAMES HUGHES.

5 boiler shell, tubes connected with thesaid Witnesses:

tube sheets, and extending at angles thereto, JOHN R. JONES, a legsheet connected with the fire box, tube JOHN J. SHOPLAND, sheet and formed with a flange, and braces ex- JAS. A. MELLON.