US487648A

US487648A - Furnace-grate

Info

Publication number: US487648A
Authority: US
Publication date: 1892-12-06
Anticipated expiration: 1909-12-06

Description

(No Model.) 2 Sheets-Sheet 1.

J. THURELL. FURNACE GRA B.

No. 487,648. Patented Dec. 6, 1892.

QM azu/i v (NO Model.)

2 Sheets-Sheep 2. J. TH'URELL. FURNAGE 'GRATB. No. 487,648.

Patented Dec. 6 1892.

- UNITED STATES PATENT OFFICE.

JOHN THURELL, OF NORTH ADAMS, ASSIGNOR OF ONE-HALF TO JAMES B. KEANY, OF MILFORD, MASSACHUSETTS.

FU RNACE-G RATE.

SPECIFICATION forming part of Letters Patent No. 487,648, dated December 6, 1892. Application filed April 30, 1892. Serial No.431,352. (No model.)

T0 at whom it may concern:

Be it known that 1, JOHN THURELL. a citizen of. the United States, residing at North Adams, in the county of Berkshire and State of Massachusetts, have invented new and useful Improvements in Furnace-Grates,of which the following is a specification.

My invention relates to furnace-grates of the same general type as that shown and described in the Letters Patent granted to me upon the 29th day of September, 1891, No. 460,408.

It is the purpose of my present invention to provide a grate-frame of novel construction suitable for stoves and for steam-boiler furnaces in which overheating and warping of said frame shall be avoided, and whereby, also, the grate shall be capable of manufacture at a low cost and maybe repaired with great ease and economy, the parts being all made in duplicate and the construction being so simple that any person can replace one or more injured or broken portions with new parts with great facility and with the minimum of time and labor.

It is a further purpose of my invention to provide a grate suitable for stoves and steamboiler furnaces, both stationary and locomotive, which shall be dumped and shaken by the same novel devices, which shall be characterized by the resulting economy of fuel, cleanliness of operation, quick and complete combustion,increased coal-supporting area or grate-surface, and simplicity and ease of operation.

The invention consists, to these ends, in the several novel features of construction and new combinations of parts hereinafter fully described, and then particularly pointed out and defined in the claims concluding this specification.

To enable others skilled in the art to understand and to make, construct, and use my said invention, I will proceed to describe the same in detail, reference being had for such purpose to the accompanying drawings, in which- I Figure 1 is a plan view of a grate embodying my invention, having a form suitable for use in a stove or range. Fig. 2 is a plan view of the same grate as it appears in a steamboiler furnace. Fig. 3 is a longitudinal vertical section of the parts shown in Fig. 1, partly in elevation. Fig. 4 is a sectional view of part of the devices shown in Fig. 2. Fig. 5 is a detail cross-section showing the construction of the shaking and dumping devices illustrated in Fig. 1. Fig. 6 is a detail end elevation of one of the grate-frames shown in Fig. 2. Fig. 7 is a detail view of the end bars and the lower part of the side bars of the grateframe, showing their formation in a single piece. Fig. 8 is a detail view of the upper part or. complementary section of one of the side bars; and Fig. 9 is a detail horizontal sectional view, on a small scale, of a portion of the grate-frame shown by Fig. 7.

In the said drawings, the reference-numeral 1 indicates the glate frame, which is usually rectangular and oblong, though it may be constructed of any form required or preferred. I form this frame in three pieces, the end bars 2 and the lower longitudinal portions or sections 3 of the side bars being cast in a single piece. These portions 3 of the side bars may be about half the depth of the end bars, or they may exceed or fall short of this width, as circumstances may require. Preferably, I increase their width somewhat from the ends toward the middle portion, to give additional strength and stiffness. In their upper edges,

at proper intervals, are formed seats or bearings at for the journal-supports of the gratebars, said seats being less-than half round, or comprising an area of somewhat less than one hundred and eightydegrees. The frame is completed by the separately-formed complementary sections or upper portions 5 of the side bars, which are of such length that their ends will enter mortises or channels 6 in the inner faces of the end bars, said mortises or channels being so located that the complementary or upper portions 5 of the side bars when in place will be substantially flush on both faces with the corresponding faces of the lower portions or sections 3, while their ends and upper edges will be flush with the edges of the end bars. In the lower edges of the separately-formed sections or complementary portions 5 are formed thecomplementary portions 7 of the seats or bearings 4 for the ends or journals of the grate-bars,

which are inserted before the upper complementary sections 5 are arranged in their places, where each one is fastened by a single bolt 8, inserted in a suitable aperture in the part 3. I may substitute for this bolt any other equivalentform of fastening device. I may cast the bolt or other fastening integral with the upper sections 5; or I may countersink the upper edges of said sections to receive the bolt-heads; or I may adopt any other preferred construction suitable for this purpose. V

The bars of the grate consist, preferably, of rectangular parts 10, provided with journals 12 at their ends, which are of such length that their extremities project beyond the outer faces of the side bars.

Upon the upper edges of the grate-bars are form ed or mounted theclinker-plates 13,which project alternately upon opposite sides of each bar and break joints with the clinker-plates upon the adjacent shafts. Upon the extremities of the journals of the grate-bars, which project outside the side bars, are formed 01' mounted clinker-plates 14, those upon one side of the grate extending from one side of the bar and those upon the other side proecting in an opposite direction in order to equalize the weight. Upon the grate-bars lying atthe ends of the grate twoof theclinker-plates are cut off to avoid colliding with the end bars, and the other two project unequally upon opposite sides of the bar, in order to properly fill the space between the grate-bar and the end bar of the frame. The alternation of the exterior clinker-plates 14 enables me to compensate the inequality of weight thus produced and at the same time to properly fill the space between the side bars and the walls of the fire-box by mounting on one of the journals a plate 15, which projects about equally on both sides of the grate-bar axis, while upon the other journal is mounted or formed aclinker-plate 16, which projects upon the same side with the shorter clinker-plate 17. The same arrangement is alternated at the other end of the grateframe, owing to the odd numberof the gratebars. Should their number be even instead of odd, the alternation will be unnecessary, the construction in other respects being the same.

The grate-bars are laid in place with their journals in the seats 4 before the upper complementary sections or portions 5 of the side bars are set in place. The construction is such that when their ends are placed in the mortises 6 and the bolts or fastenings 8 are adjusted there will remain an open space 18 between the lower and upper sections of the side bars, which will atford ample draft-passages. The current of air flowing through these spaces 18 will maintain the low temperature of the sections 3 of the side bars, and thereby wholly avoid the warping of the frame.

From the lower edges of the grate-bars are dropped lugs 19, having studs projecting horizontally to engage apertures in a bar 21. At one end this bar is connected to an arm 22, which forms partof abar 23. In the form of grate shown in Fig. 1 this bar 23 enters the fire-box by a longitudinal slot in the end journal 24:, by which the grate is supported, said journal being placed a little upon one side of the central line of the grate, in order that gravity shall normally preserve 1t in horizontal position, its heavier side belng supported by small brackets 25 on the wall of the fire-box. The bar 23 is movable longitudinally in the slot in the journal 24, and its outer end is provided with a cross-head 26 or any suitable form of lever, whereby a rocking movement may be given to the gratebars, or a rotary motion imparted to the entire frame, turning it upon its end ournals 23, the grate being thus shaken and dumped by the same device.

In the form of grate shown in Figs. 2 and t the construction adopted is essentially similar, the only variation consisting in pivoting the end of the bar 21 to a lever 27, having a pivotal fulcrum 28 upon the. curl bar of the grate-frame. This lever is provided with a socket -piece 29, having an angular socket adapted to receive a lever 30 of suitable form, whereby the lever 27 may be vibrated upon its fulcrum 28 to shake the grate, and whereby, also, a rotary movement may be given to turn the grate-frame on its end journals and dump the grate. In all other respects the construction of the parts shown in Figs. 2 and 4 is substantially identical with that seen 1n Figs. 1 and 3.

What I claim is- 1. In a fire-grate, a grate-frame composed of end bars 2 and lower side-bar sections 3, cast integral with the end bars, and separate side bar sections 5, located above and connected with the said lower side-bar sections, substantially as and for the purposes described.

2. In afire-grate, a grate-frame composedof end bars cast in single piece with longitudinal lower portions of the side bars and coinplementary sections or portions of the said side bars formed separately, the end bars of the frame being provided with mortises or channels to receive the ends of the complementary sections and the adjacent edges of the upper and lower sections being provided with seats or bearings for the journals of the grate-bars, substantially as described.

3. A grate-frame for stoves and furnaces, consisting of end bars cast in one piece with lower longitudinal portions or sections of the side bars, separately formed complementary sections or portions of said side bars of somewhat greater length than the integral sections, their ends being received in mortises or channels in the inner faces of the end bars, and grate-bars having journals lying in seats or bearings between the lower and the complementary upper sections of the side bars, a

space being provided between said upper and lower sections for the passage of air, substantially as described.

4. In a grate for stoves and furnaces, the combination, with the lower sections or portions of a grate-frame cast integral with the end bars and having seats 01' bearings, of gratebars having journal-supports lying in said seats and complementary upper sections or portions of the side bars having their ends lying in mortises or channels in the end bars and their edges resting upon the journals of the grate-bars, said complementary sections or portions of the side bars being separated from the integral sections, to which they are connected by a central fastening, substantially as described.

5. In a fire-grate, the combination, with a rocking grate-frame having end journals, of

Witnesses:

EDWARD GUILBR, MARK E. CoUcH, CHARLES KEANEY.