US661803A - Fire-box. - Google Patents

Description

Pat'gnted N ov. l3, I900.

B. B. HOISINGTON.

FIRE BOX.

(Application filed may 5, 1900.)

2 Sheets-Sheet I.

(No Model.)

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' machines.

and an imperforate bottom section 7.

UNITED STATES PATENT OFFICE,

BENJAMIN R. HOISINGTON, OF MINNEAPOLIS, MINNESOTA,

FIRE- Box.

I SPECIFICATION forming part of Letters Patent No. 661,803, dated November 13, 1900. Application filed May 5, 1900. Serial No. 15,564- (No model.)

To aZZ whom/it may concern;

Be it known that I, BENJAMIN R. HOISING- TON, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Fire- Boxes; and I do hereby declare the following to be a full, clear, and exact description of the invention, suohvas will enable others skilled in the art to which it appertains to make and use the same.

My present invention has for its objectto improve the construction of boiler fire-boxes with a viewof obtaining the maximum of heating-surface and hence the maximum of generating efficiency.

To this end the invention consistsof the novel devices and combinations of devices hereinafter described, and defined inf-the claims. t I i The invention is illustrated in the accompanying drawings, wherein'like characters Figure 1 is a view, partly in side elevation and partly in longitudinal vertical section,showing a boiler having a fire-box constructed in accordance with my invention. Fig. 2 is a transverse vertical section on the line x 00 of Fig. 1, and Fig. 3 is a horizontal section approximately on the line m 00 of Fig. 1.

In the drawings 1 have illustrated the features of my invention as incorporated in the fire-box construction of a traction-engine such as used in connection with threshing- The numeral 1, indicates the body of the boiler, and the numerals 2 and 3 indicate,respectively, the frontand rear wheels of the engine, certain parts of the engine being removed.

The main or primary portion 4 of the firebox is formed between or within water-jacketed walls 5, and the bottom of said fire-box is shown as made up of. an ordinary grate 6 An ordinary fire-door 8 opens and closes an ordinary opening in the rear wall of the fire-box to afiord means for supplying fuel into the primary chamber or fire-box proper, at.

The boiler fines or tubes 9 extend backward, preferably, over more than half of the fire-box or primary chamber t and are secured at their ends in the ordinary manner in suitable openings of a flue-sheet 10. A water-chamber 11, which communicates with the main body of the boiler, depends into the primary chamber 4:, but terminates at its ends short of the front and rear walls of the said chamber at, as best shown in Fig. 1. Extending longitudinally and approximately horizontally through the water-chamber 11 is a combustion-passage 12, which is preferably rectangular in cross-section and made thinner or contracted atits rear end. The rearinner wall of the fire-box 4: is extended upward and then forward, forming a crown-sheet, as shown at 13, and is connected at its forward edge to the upper edge of the flue sheet 10. Thus a supplemental or secondary combustion-chamber .14 is formed above the chamber at and be tween the said chamber 4 and the fines 9.

The products of combustion for the burning fuel may pass from the primary chamber L to the supplemental or secondary combustion-chamber latby either one or both of two routes, to wit: the one through the combustion-passage 12 and upward into the said chamber 14 and the other directly upward from the said chamber4 through acontracted passage 15 and thence into the said chamber 14:. The contracted passage 15 is adapted to be closed and opened more or less by a dam: per-plate 16, which rests upon a shelf 17, secured to the rear inner wall of the fire-box. To hold the damper-plate 16 where set, it is provided at its ends'with lugs 18, adapted to fit. between any two of a series of teeth or; lugs 19 onthe ends of the shelf 17. To provide for the adjustment of the said damper "16 from the exterior of the tire-box, it is shown as provided with an eye or perforated lug 2 0, with which the end of a poker or similar tool maybe engaged. To provide for the insertion of the poker, the lire-box is provided with a small door above the shelf 17.

It will be noted that the crown-sheet 13 of the auxiliary chamber 1 1 is below the level of a column of water z, so that this sheet 13 serves also as a generating-surface. It will also be noted that the combustion-passage 12 is less in width than the combustion-chamberse and 14. To give free circulation of the water from the water-jacketed sides of the fire-box to the sides of the water-chaintaste berll, theinner side walls of the firebox are 1 cut away opposite to the said water-chamber 11, as shown at 22, and water-tightjoints are formed between the sides of the said waterchamber 11 and the said Walls of the'firebox by means of riveted and calked strips 23. v

(Best shown in Fig. 3.) The horizontal crown-sheet 24 at the top of the primary com bustion-chamber4 and at the top of the passage 12 is preferably additionally supported from the top of the boiler by rods 25. Other rods and bolts are employed Wherever desired to give additional strength and rigidity to the parts.

With a fire-box constructed as above described and with the passage 15 opened by the damper 16 the products of combustion or burningfuel flames will divide, part passing through the return draft-passage 12 and from thence into the secondary combustion-chamber 14 and partpassing under the bottom of the Water-chamber 11 and upward through the passage l5into the said secondary chamber 14. As .the divided products reunitein the secondary combustion-chamber 14 the combustion will be again intensified by the intermiuglirig of the flames or burning gases and from this chamber will be again'divided and passed: forward through the ordinary fiues 9. By regulating the damper '16 more;

or lessof the draft and burning products may be directedthrough the passages 12 and 15, so. that in this'way the best distribution of heat on the generating-surfaces may be attained;

in presence of-two witnesses.

From the above description it obvious that a very large amount of generating or heating surface is exposed tovthe flame; also, by

dividing the burning gases and reuniting them the combustion is rendered more COIII- plete, which of itself results in asaving of fuel and energy.

What I claim, and desire to secure by Let ters Patent of the United States, is as follows:

. 1. In a fire-box, the combination with a primary combustion-chamber, of a secondary combustion-chamber above the same leading to the lines, a direct passage between said combustion-chambers, and an approximately horizontal water-jacketed return draft-passage leading from the said'primary to said secondary chamber, substantially as de- Witnesses:

i r MABEL M. MCGRORY, D. MERCHANT.

BENJAMIN R. H'OISINGTON.- l

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