US752438A - Muffle - Google Patents

Description

No. 752,438. PATENTED FEB. 16, 1904.

V J. & A. G. CARTER..

MUFFLB.

APPLIDATION FILED JULY 2B, 1903. N0 MQDEL. 2 SHETS-BHBET 1.

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PATENTED FEB. 16, .1904.' J. '& A. G. CARTER.

` MUPFLE.

APPLIOATION FILED JULY 2e, 190s.

2 SHEETS-SHEET 2.

No MODEL.

ATTORNEYS UNITED STATES Patented February 16, 1904.

PATENT OFFICE.

JOHN CARTER AND ALFRED GEORGE CARTER, OF MALDEN,

lvLASSACHUSETTS.

VMUFFLE.

SPECIFICATION forming part of Letters Patent No. 752,438, dated February 16, 1904.

' Application filed July 28, 1903.` Serial No. 167,291. (No model.)

To @ZZ whom it may concern:

Be it known that we, JOHN CARTER and AL- FRED GEORGE CARTER, citizens of the United States, and residents of Malden, in the county of Middlesex and State of Massachusetts, have invented a new and Improved Muffle, of which the following is a full, clear, and exact description.

Our invention relates to muiiies, and more particularly to a type of mufie in which combustion is very thorough and the heat evenly distributed.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in both figures.

Figure 1 is a vertical central section on the line'l 1 in Fig. 2v through a muflie embodying our invention, and Fig. 2 is a section upon the line 2 2 in Fig., 1.

A base 1 is provided with an annular portion 2, surrounded by a cylindrical portion-3, and upon this cylindrical portion is a conical stack 4.. Fire-holes are shown at 5, each being provided with grate-bars 6 and with a door 7 having a threshold 8, supported upon a lintel y 9. Above the grate-bars 6 are apertures 10, from which .the smoke and gases of combustion are free to pass upward through passages 11 to the chamber 12. A central iiue 13 is provided, and encircling this central line is a relatively large cylinder 14, surmounted by a dome 14, this dome being connected with the central flue 13. The lower end of the central flue 13 is connected with a head 13, below which are radially-disposed passages 15, each of which is connected with a vertical passage 16. Each4 vertical passage is obstructed at its upper portion by an arch 17. A dome 18 is supported by the arches 17, which obstruct the passages 16, and by apertured arches 17 a, which register with the passages 11. By means of passages 19 the vertical passages 16 are free to discharge the gases of combustion into the conical stack 4. A plate 20*L in the nature of a damper projects slightly from the junction between the cylinder 3 and the stack 4, said plate being slidably movable back and forth over the passages 19, as desired. A comparatively short alternative Vflue 21 is mounted upon the dome 18, and a 5o Y cap 22provided witha ring 23, is pivoted at 24 upon the alternative iiue 21 and is free to move upwardly, as indicated. by dotted lines in Fig. 1, a chain 25B" being connected with the ring 23 and passing over a pulley 26 toahandle 27, whereby the. cap may be opened when starting the lires, and when the fires have attained suiiicient headway the cap may be closed. A passage 28 is provided in the cylindrical portion 3 for the purpose of inspecting the condition or the iames within the passages 11,v and it will be noted that the passages 11 and 16 alternate with each other.

The meile-chamber is shown at 25. Passages 29 in the annular portion 2 are bifurcated into distinct branches 15EL 15b, (see Fig. 2,) and these branchesterminate in apertures 15c (see Fig. 1) for the purpose of discharging air into the flame, such air being heated in its passage from passages 29'to the apertures 152 7o and does not in any measure cool the tires, but mixing with the gases adds to the intensity of the same.

Our invention is used as follows: Fires being lighted in the several fire-holes 5 by means of fuel resting upon the grate-bars 6, the smoke and gases of combustion pass upwardly through all of the passages 11, thence through the passages 12, and downward through the central line 13, as indicated by the arrows in 8o Fig. 1. The smoke and gases arriving at the bottom of the central flue 13 radiate outwardly and pass upwardly through the passages 16 until they encounter the deflecting-arches 17, from whence they pass upwardly' through the passages 19 20 into the conical stack or chimney 4, thus making their escape. It will be noted that the severalupward drafts represented by the passages 11 are arranged alternately with the several upward drafts represented by the passages 16. The air is drawn inward through the several radially-disposed passages 29 and is thence divided and distributed through the branches 15 15b and apertures 15e to the flames at points elevated somewhat above the grate-bars 6. By this means the device acts somewhat in the capacity of a smoke-consumer, therebycausing thorough combustion ofthe unburned gases and smoke and not only economizing fuel, but causing a more perfect distribution of the heat.

Having thus described our invention, we

claim as new and desire to secure by Letters Patent- 1. In a muiiie, the combination of a hollow member, a cylinder mounted therein and connected thereto, a central flue connected with said cylinder and passing through the same, a dome covering said cylinder and said flue, said dome being provided with an aperture, a mem member, a revoluble pulley mounted therein, a central flue disposed within said hollow member, a cylinder encircling said iiue, a dome covering said cylinder and said central lue, said dome being provided with an aperture, a closure member for closing said aperture, anda chain connected with said kclosure member and passing over said pulley for the purpose of enabling said closure member to be operated from a point external to the Inutile.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

' JOHN CARTER.

ALFRED GEORGE CARTER.

Witnesses:

RALPH S. CARTER, ERNEST CARTER.

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