US229319A

US229319A - Peterg photo-uthographer

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Publication number: US229319A
Authority: US
Publication date: 1880-06-29
Anticipated expiration: 1897-06-29

Description

(No'jmdel.)

ammi-sheen., J. L. L. KNOX.

Grate for Furnaces of Steam' Boilers. No. 229,319. Patented June 29.18180.

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No. "229,319. Patented June 29, 1880.

. WJTNESSES.- NVE/V701? NAPETERS. PHcIG-LITHOGRAPHER, WASHINGYON. D. C.

UNITED STATES PATENT OFFICE.

JOHN L. L. KNOX, OF ALLEGHENY, PENNSYLVANIA.

GRATE FOR FURNACES OF STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 229,319, dated June 29, 1880.

Application filed April 29, 1880.

To all whom it may concern:

Be it known that I, JOHN L. L. KNOX, of Allegheny, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Grates for Furnaces for Steam-Boilers; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

My invention relates to an improvement in grates for furnaces for steam-boilers; and it consists in constructing the grates in detachable sections and pivoting them in a frame furnished with detachable bars arranged transversely in said frame, said grate-sections consisting of a series of bars attached to the upper side of avtransverse detachable supporting bar, constructed in two parts, with a sleeve-trunnion at each end tted to detachable bearings and braced through the medium of a curved rod, (commonly called a hogf chain,) and connected by detachable rods, for imparting an oscillatory motion to them and the bars supported thereon, the ends of which lock into each other, and thereby form a firm grate-section, the whole being so constructed, combined, arranged, and operating that the area of air-surface under the fire on the grate-sections is more than the area of the grate-bars upon which the iire rests, and the accumulation of ashes upon the bars avoided, thereby admitting an ingress of air suflicient to protect said bars from burning, and also insure complete combustion of the fuel, which may be agitated by the oscillation of the grate-sections, at the will of the operator, for rupturing the incrusted or conglutinated fueln To enable others skilled in the art with which my invention is most nearly connected to make and use it, I will proceed to describe its construction and operation.

In the accompanying drawings, which form part of my specification, Figure] is a top view or plan of my improvement in grates for furnaces for steam-boilers. Fig. 2 is a vertical -andlongitudinal section of the same at line a: of Fig. l. Fig. 3 is a vertical and transverse section of the same at line y of Fig. 1. Fig. 4 s

is an end View of the same, representing the (No model.)

of the same, representing the grate-section tilted. with portions of one side of the grateframe broken away. Fig. 6is a top view of the detachable cross-bar of the frame for the grate. Fig. 7 is an end View ofthe same. Fig.. 8 is a side view of one of the bars which form the grate-section. Fig. 9 is an end view of the same. Fig. 1() is a side view of the transverse detachable supporting-bar for the grate-sections. Fig. 11 is an end view of the same. Fig. l2 is a face view of the detachable bearings for the trunnions of the transverse detachable supporting-bar for the grate-sections. Fig. 13 is a detail view of that part of the grate-frame to which the detachable cross-bar is attached, and Fig. 14 is a vertical section of the same.

In the accompanying drawings, A represents the frame for the grate, which is constructed in two or more sections, B, by the linien of a series of grate-bars, l, the ends of which are locked together by means of the side projections, m, of one bar being placed in a corresponding recess, n, in the next bar, as shown in Fig. 4, said grate-bars L being supported on a detachable supporting-bar, D, to which they are attached by means of the dovetail pendant o, which is placed between the two halves i and j of the supporting-bars D.

On each side of the grate-bars l, at their y center, areprojectingseparating-piecesp,which terminate in aconiforin point. On one of these separation-pieces is a projection, r, which is fitted to a recess made in the other separatingpiece. This projection and corresponding recess in the separating-piecesp is of advantage in preventing longitudinal movementof the bars l, in arranging them for forming a gratesection, by holding the dovctail pendants o parallel with each other, thereby enabling the construeter to attach the supporting-bar to the grate-section with more facility than he could do in case of the absence of said projection r and its corresponding recess. This projection and recess in the grate-bar l is not an essential feature of the bar, which may or may not be used,.as deemed best by the manu- Ioo at s t in Fig. 7. On each of the Adetachable supporting-bars D is a trunnion, o, divided vertically, one-half the trunnion being on each parti and j of the supportin g-bar D. The trunnions u are provided with a sleeve, 1c, which holds the two parts of the trunnion firmly together, as clearly shown in Fig. 11. From the lower edge of the parts i and j of the detachable supporting-bar D project pendants no y', recessed at a', which pendants are united, as shown in Figs. 2, 3, 10, and 11, when the two parts z' and j are placed in juxtaposition, as shown in Fig. 1. When the parts t' and j of the detachable supporting-bar D are clamped together by tongued projections, such as s t, (see Fig. 7,) with the pendants o and bars Z between them and sleeves fw placed on the trunnions o, the supporting bar D is then braced by the curved bar b, which is tted in the recess a of the pendants y', and the ends of it secured to the ends of the supporting-bar D by screw-bolts c, as indicated in Fig. 3.

The section B of the grate is then ready to be pivoted in the frame A, which is accomplished by placing the trunnions n in the opening cl of the detachable bearing-plates e', having beveled edges f', which bearing-plates are then placedin recesses in the frame A corresponding to the form of said plates, as shown in Fig. l. The sections B of the grate having been pivoted in their frame A, as indicated in Figs. 1, 2, 3, 4, and 5, the different sections of the grate are coupled by means of connectingrods g' h, which are furnished with hook ends, which hook on the curved braces b, the forward end of the connecting-rod h being pivoted to an angle or L lever, 7a', at i', which lever is pivoted to-the frame A at j', as shown in Figs. 2 and 3.

rlhe arm Z of the lever 7c is provided with a socket, m', for the reception of the end of a lever for operatin g the lever 7c and the parts attached thereto.

The detachable transverse bars n a are locked together by means of the tongued projections s t, and the projections r on the ends of said bars are fitted to recesses o", made in the frame A. `(Shown in Figs. `l, 13, and 14.)

The projections p (j ust below said recesses 0') on the inner walls of the frame A enter the space between the transverse bars it u and aid in supporting them in the frame.

The sides u of the transverse bars a n are curved, as shown in Figs. 2 and 7, andthe projections w on theinner walls of the ends ofthe frame A are also curved, as indicated inFig. 2. These curvatures are made for the purpose of keeping the ends of the bars l of the grate-sections B the same distance from said projections w and bars n n when vibrating the gratesections B, for it will be observed that by the agitation of said grate-sections they have a compound movement-to wit, a vibrating and longitudinal movement, the latter a slight one, but sufficient to give a drawing or creeping action to the grate-surface, which, combined With the vibration, eft'ectually cleans the whole surface of the grate-section from all refuse of combustion, and at the same time breaks up the mass of fuel resting upon the grate. This compound action of the grate while agitating it is due to the fact that the bars l of the gratesections rest upon the detachable supportingbars D, the axes of the trunnions of which are considerably below the top edge of said bar and very much below the surface of the grate-` sections B.

It will be observed that the upper edge of the bars l of the grate-sections B are circular when viewed in cross-section, (showninFig. 3,) which form prevents the accumulation of ashes in the bars,and at the same time gives afreeinlet of air, which prevents the burning of the bars and insures complete combustion and consumption of the fuel.

[t has been a matter of' observation that grate-bars in furnaces, after their top edges have become rounded by use, last longer, and that the-lire of the furnace is more efficient, and th at the consumption and combustion ofthe fuel are more perfect and complete, than when said bars were first placed in the furnace; yet this suggestive fact has never been utilized prior to the date of my invention. K

The operator, when he desires to agitate the re on the grate-sections B, places a bar or lever in the socket m of the lever 7c', and by a vertical reciprocating movement of said bar or lever will, through the medium of the lever k and coupling-rods 71. g', impart to the supporting-bar D and the grate-sections B a vibratory motion, which will eftectually agitate. the burning fuel 'resting thereon, and at 4the same time clean the bars lfrom ashes and other refuse of combustion.

The grate hereinbefore described may be adapted to any of the known forms of furnaces, hre-places, and stoves without departing from the essential features of my invention.

The sleeves w on the trunnions o of the supporting-bars D and the detachable bearingplates may be readily replaced in case of wear, whereby about the same plane of grate may be always had, which is a very desirable thing in a furnace, the plane of the grate being always arranged with relation to the other elements of construction of the furnace.

Having thus described my improvement, what I claim as of my invention is 1. The combination of the frame A, provided with detachable transverse bars a u', the grate-sections B, attached to detachable supporting-bars D, pivotedin detachable bearings e', and operated through the medium of a lever, 7c', and coupling-rods g 7L', substantially as herein described, andfor the purpose set forth.

2. The frame A, the ends of which are provided with inward-curved projections w and detachable transverse bars a n', the sides of which are curved, in combina-tion with the grate-sections B, constructed and pivoted substantially as herein described, and for the purpose set forth.

3. The detachable supporting bearing-bar D,

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constructed in two parts with pendants, and 5. The detachable transverse bars n', probraced by a. curved bar, b, and furnished With vided With the projections r and tougued protrunnions l1,inc21sed in sleeves w, substantially jections s t, iu combination with the frame A, as herein described, sind for the purpose set provided with the recesses o' and projections 5 forth. p', substantially as and for the purpose herein 15 4. The grate-bars Z, the ends of which are 'shown and described. provided with a recess, n, and projection m, JNO. L. L. KNOX- furnished with pendants o and separa-ting- Witnesses: pieces 1o, substantially as herein described, and A. C. JOHNSTON,

1o for the purpose set forth. JAMES J. JOHNSTON.