US493232A - Locomotive-boiler - Google Patents

Description

(No Model.)

J. T. MCLBLLAN. LoooMoTIVE BOILBR.

Patented Mar. '7, 1893.

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Uivrrnn STATES FFICEG JOHN T. MCLELLAN, OF TRURO, CANADA, ASSIGNOR OF ONE-HALF TO HORACE W. OHALFANT, OF MINNEAPOLIS, MINNESOTA.

LOCOMOTlVE-BOILER.

SPECIFICATION forming part of Letters Patent No. 493,232, dated March 7, 1893. Application met February 15, 1892. serial No. 421,571- (Nc model.)

To all whom it may concern,.-

Be it known that I, JOHN T. MCLELLAN, of Truro, in the county of Colchester, Province of Nova Scotia, Canada, have invented certain Improvements in Locomotive-Boilers, of which the following is a specification.

My invention relates to means for obtaining from a given quantity of fuel a greater amount of energy than can be developed in the ordinary boiler and its object is to materially increase the heating surface ot' the boiler.

To this end my invention consists in the combination with the boiler shell, of the crown plate, the dues, the lire-box, the grate, and an intermediate water leg or partition depending from the top of the fire box and having openings in its top, front and rear walls for the inlet and egress of water and steam; and in various constructions and combinations hereinafter described and particularly pointed out in the claim.

My invention will be more readily understood by reference to the accompanying drawings, in which:-

Figure 1 is a side elevation of a boiler embodying my invention, the fire-box of the same being shown in vertical section,the section being taken through my auxiliary or middle water leg. Fig.l 2 is a front elevation partly in section on the line y-y of Fig. l.

Fig. 3 is a transverse section on the line -m,

The two doors 17, 17 are hung upon asingle pin or hinge 19 and have the usual fastening latches. The door casings 18 extend through both the end of the shell and the plate 6 into the lire-box.k Midway between the sides of ythe tire-box and extending longitudinally be- The usual water legs are formed tween the plates 3 and 6 I arrange the hollow partition made up by the doubled plate 11 having its upper edges secured to the under side of the crown plate. The flared edges 16 of this plate 11 are secured upon the plate 6. The forward portion of the hollow partition is riveted to the lower part only of the plate 3, the edges 16 thereof being firmlyA riveted upon said plate. 'The upper part of this portion of the plate 1l is cut back in front of the dues, the chamber 12 between the plates being closed at this point by the transverse plate 13. Thus a clear space 15 is left in front of the ues for the free use of the tube expander from the two sides of the fire-box. A continuous space is left, between the grate and the lower edge of the doubled plate 1l to allow the removal or rocking of the grate. The water entersthe chamber or leg 12 through a large number of openings, 14 arranged in the `plates 3, 8 and 6 respectively and communicating with the chamber 12. For clearing out this intermediate or auxiliary leg I provide the opening 20 leading from the lower corner of the leg 12 and extending through therear of the boiler shell, the opening being v closed by the removable plug 2l. It will be seen that by removing the plug the wat-er may be drawn oif from the leg to flush and clean out all of the sediment which may have accu# mulated therein. By this means I subject a considerable body of water to the most direct and the greatest heat obtainable from the fuel in the fire box, while at the same time adding but little to the cost of the construction ofthe boiler. In addition to this advantage is that of dividing the cold drafts of air entering through the doors, so that only one half of the boiler is cooled when the door is opened, the other half retaining its full heat. As a result I save the pressure of steam in the boiler and keep the same practically constant.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- The combination, with the crown-plate, of the sides thereof, the boiler-shell surrounding the same, the grate, water legs being formed at the sides of the crown plate and the shell tine-sheet of the re-box,snbstantia1ly as deand extending down to the grate, the uescribed. [o sheet and the fines, the intermediate Water In testimony whereof I have hereunto set leg terminating above the grate and formed my hand this 10th day of February, 1892.

5 of a separate plate, the transverse part 13 .I OHN T. MCLELLAN.

thereof, an opening 15 being formed between In presence of said plate and the flue-sheet, and perforations F. S. LYON, 14 in the crown-plate and in the end Wall or C. G. I-IAWLEY.

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