US866588A - Grate. - Google Patents

Description

No. 866,588. PATENTED SEPT. 17, 1907. W. JOHNSON,-DEGD.

n E Jonson nxnuvrmx GRATB.

APPLICATION FILED APB.7,1902.

3 SHEETS-BEBE! l.

PATENTED SEPT. 17, 1907. W JOHNSON, DEGD.

11. n. JOHNSON, EXEGUTRIX.

GRA'IE.

APPLICATION IILED APR. '1. 19oz.

3 SHEETS-SHEET 2.

No. 866,588. PATEN'I'ED SEPT. 17, 1907.

W JOHNSON. DEGD. I. n. Jonson, nxnouzrnrx.

GRATE.

APPLICATION nun APR. '1. 1902..

3 SHEETS-SHEET 3.

UNITED STATES PATENT OFFICE.

WARNER JOHNSON, OF BOSTON, MASSACHUSETTS; MARY E. JOHNSON, EXEOUTRIX OF SAID WARNER JOHNSON, DECEASED, ASSIGNOR, BY MESNE ASSIGNMENTS, TO JOHN E. ABBOTT,

OF WATERTOWN, MASSACHUSETTS.

GRATE To all whom it may concern:

Be it known that I, WARNER JoHNsoN, a citizen of the United States, residing at Boston, in the county of Suffolk, State of Massachusetts, have invented a certain new and useful Improvement in Grates, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention has forits object to providean improved grate of that class in which the grate bars are longitudinally movable which shall be of simple and durable construction, and in which the friction of the grate bars on their supports shall be reduced to a minimum.

My improved grate is particularly designed for use in furnaces although as will be clear the characteristics of my invention are such as to render its use advantageous, and of great utility whenever a shaking- 01' movable grate is desired.

My invention is fully set forth in the following description and the novel features thereof are pointed out and clearly defined in the claims at the close of this specification.

Having reference to the accompanying drawings which form a part hereof, Figure 1. is a plan view of a grate embodying my invention. Fig. 2 is a view in side elevation of the grate shown in Fig. 1, portions thereof being shown in section and parts being broken away for greater clearness. Fig. 3 is a plan view of the grate-bar supporting-frame. Fig. 4 is a detail showing in elevation the rocking bar or actuator, two of the grate bars being shown in position to indicate their relation thereto, as is also the socket which receives the handle by means of Which the grate is shaken. Fig. 5 is a side elevation on slightly reduced scale of one of the headers, one of which is placed at each end of the grate.

As will be clear, the grate bars are supported by a frame which is shown separately in Fig. 3, and this frame is adapted to be placed Within the furnace or fire-box and to be supported therein in any well known 40 manner The construction and arrangement of this frame will first be described.

Each side bar a of the frame is made with a removable middle section a, and these, middle sections may,

' when desired, be removed and others of different length substituted so that the frame may be made longer or shorter to support-grate bars of greater or less length according to the length of the furnace or fire box into which the grate is to be placed. Each middle sectiona is provided with shoulders or against which the ends of the end sections of the side bars abut, said end sections being detachably fastened to the middle sections Specification of Letters Patent. Application filed April 7,1902. Serial No. 101,764..

Patented Sept. 17, 1907.

a by means of bolts a secured by nuts or the like as shown.

Each side bar a is provided near its opposite ends with pockets or recesses a, as shown clearly in Fig. 2, in which rest the ends of two cross bars a The cross bars a are each provided at its ends with lugs a which engage the side walls of pockets (1 so as to hold the cross bars and side bars in proper relative positions.

Cross bars a are each made up of two vertically disposed and comparatively thin walls or cross pieces which are connected together by a number of short transverse connections a Pairs of the connections a serve as supports and tracks for rolls 1) which are herein shown as in the form of spools with a flange b at each end.

Upon the rolls 1) and between the flanges thereof are mounted the grate bars 0 which are held in position on the rolls, and also relatively to one another, by said flanges, which latter engage with the sides or downwardly projecting webs of the grate bars and with the sides of the connections or rails a on cross bars a.

At their front ends alternate bars of the series of grate bars 0 are provided upon their under sides with sockets 0 into which extend the ends of arms (1 which proj ect upwardly from a bar actuator d herein shown as a rock-bar. The other or intermediate grate bars 0 are each provided with a depending lug or finger c which is forked at its lower end and is in engagement with the bottom of a notch d provided in rock bar (Z opposite each lug 6 Rock bar d is provided at its ends with trunnions (7 which rest in open-topped bearings a provided upon the top of the side bars a near the front ends thereof.

The rock bar d carries a socket piece d which is adapted to receive the end of a hand lever, not shown, by means of which the bar d is rocked on its trunnions d to reciprocate the grate bars 0. This socket piece (Z is adjustably connected with rock bar (1 so that it can be properly positioned transversely with relation to the door of the furnace in which the grate is to be placed, and so that the end of the lever above referred to can be passed through the door or opening of the furnace from the outside and easily inserted in socket piece (1*. In order to adjustably connect socket piece d to rock bar d said socket piece is forked at its upper end and straddles the rock bar, to which it is made fast by means of a bolt d which extends through one of a series of slots (1 formed through and lengthwise of rock bar d, as will be clear from Fig. 4.

At each end of the frame and supported thereon is a detachable header 6 which rests at its lower edge upon the ends of the side bars a of the frame. The headers c are each provided with a pair of depending lugs e which extend through recesses a" formed upon the inner faces of the ends of the side bars a. Each lug e is provided with a perforation e at its lower end in which is placed a cotter pin or staple e, which serves to lock the header in place.

Each header e is formed with a flange or overhang 0" which lies over but out of contact with the ends of the grate bars 0. This overhang e is formed with slots 0 which are extended down into the vertical wall of the header as at 0 and as will be clear from Fig. 5, which shows, on slightly reduced scale, the inner side of one of these headers. The slots a divide the upper portion of each header into several sections so that said upper part of each header, which as will be clear is subjected to greater heat than the lower portion of the header on account of its proximity to the fire, may expand and contract without warping or injuring the header. Preferably each section or division of the header is also formed with slots 0 which terminate short of the vertical wall of the header and operate in substantially the manner of the slots 0. Strengthening ribs 0 may also be provided under overhang e disposed at intervals throughout the length of the header and in positions to occupy the spaces between the grate bars 0. These ribs assist in holding the grate bars 0 in position, and in guiding them in their movement.

By reference to Figs. 2 and 3 of the drawings it will be seen that each end of rock bar (Z lies between two shoulders or steps a on the side bars a of the frame and the function of these shoulders is to limit the extent of movement of rock bar a in both directions, thereby limiting and regulating the extent of endwise movement of the grate-bars c in both directions and preventing the latter from being thrust against the headers e.

My improved grate is efficient, simple and strong in construction, easy of operation, quickly set up or taken down piece by piece, all parts are securely fastened together, yet in such manner as to prevent injury from unequal expansion and contraction, and there is no interference from below the grate bars to the upward passage of the draft or to the downward passage of material from the grate bars.

It is, with this class of grates, customary, in cases where the furnace is quite large to place two or more grates side by side forming a single large grate. In such case the two outermost side bars of the frames which are at the sides of the fire box, may be supported by brackets projecting from the side walls of the lire box, thus obviating the use of bearing bars which obstruct the draft and are otherwise objectionable. The other intermediate side bars which are then in pairs between the outermost side bars, are supported upon standards resting preferably upon the floor of the ash pit.

I have herein above described the specific construction of sectional side bar which is shown in the accompanying drawings. I consider the sectional side bar of great advantage, more especially because it renders the gratesupporting frame adjustable to furnaces of various sizes by mere substitution of a central section of a different length, thereby rendering it necessary for dealers or the like to carry a stock only of central sections of various lengths in order to be able to furnish a grate of any desired length. As will be clear the precise shape and construction of the side bar or the precise method of uniting the several sections thereof is not material and I do not desire to limit myself in these particulars.

What I claim is 1. In a furnace grate, in combination, the grate-bars,

the cross-bars supporting the said grate-bars, and the sidebars each comprising the two end-portions having pockets which receive and retain the ends of the crossbar-s and the interchangeable separate spacing tie'piecc connecting the said socketed end-portions, the interchangeable spac ing tiepiece enabling pieces of different lengths to be employed to vary the length of the grate-frame as desired.

2. in a furnace grate, the combination with the sidebars having the open bearings and provided with shoulders adjacent the same. of the grate-bars, the headers, and the rocking actuator for the said grate-bars having journals reinovahly fitting the said open bearings of the sidebars, the said shoulders of the side-bars limiting the rocking movement of the actuator to prevent the gratebars from being caused to strike the headers in their lengthwise movement.

3. In a furnace grate, the combination with the side bars having open-topped pockets, of the cross-bars having the ends thereof seated in the said pockets and removable therefrom by vertical movement, the said cross-bars having flanges or shoulders which engage the side-bars and hold the latter from transverse movement and each crossbar having roll-supporting and guiding rails arranged parallel with one another in an open series extending crosswise of the grate, a series of loose rolls arranged end to end upon each series of said rails, each of said rolls resting upon two of said rails and rolling independently along the same in unison with the lengthwise movement of the corresponding grate-bar, each roll having flanges engaging with the rails upon which it rests and preventing transverse movement of the roll, and engaging with the corresponding grate-bar and preventing transverse movement of the latter, the grate bars, each taking widely separated bearings upon the corresponding rolls to prevent transverse tipping of the gratebar, and means to reciprocate the grate-bars lengthwise.

4. In a grate-bar, the combination with the sidebars having open-topped pockets, and opentopped bearings, of the cross-bars having the ends thereof seated in the said pockets and removable therefrom by vertical movement, the said cross-bars having flanges or shoulders which engage the side-bars and hold the latter from transverse movement and each cross-bar having roll-supporting and guiding rails arranged parallel with one another in an open series extending crosswise of the grate, a series of loose rolls arranged end to end upon each series of said rails, each of said rolls resting upon two of said rails and rolling independently along the same in unison with the lengthwise movement of the corresponding grate-bar, each roll having flanges engaging with the rails upon which it rests and preventing transverse movement of the roll, and also engaging with the corresponding grate-bar and preventing transverse movement of the latter, the grate-- bars, each taking widely separated bearings upon the corresponding rolls to prevent transverse tipping of the grate-bar, and the rocking grate-bar actuator fitted to the said open bearings of the side-bars.

5. In a furnace-grate, in combination, the side-bars having near the opposite ends thereof the open-topped pock ets (1. (1, and also having at said ends the vertical slots or recesses 0 0 the crossbars a a occupying the said pockets and shouldered to engage with the side-bars to hold the same from lateral movement, the grate-bars extending parallel with the said side-bars and longitudinally movable above the said crossbars, the grate-bar actuatorextending transversely of the grate and supported by the side-bars, and the headers projecting over the ends of the grate-bars and having the downward extensions or projections entering the said recesses 0 c (5. In a furnace grate, the combination with the side bars having the opentopped pockets, the open bearings and the slots or recesses, of the cross-bars entering the said pockets by vertical movement and shouldered to engage with the side-bars to retain the latter in place transversely, the rocking actuator extending transversely with relation to the grate-bars and having its ends mounted in the said open bearings, the grate-bars extending parallel with the sidebars, the headers projecting over the ends of the grate-bars and having depending lugs or projections entering the said slots or recesses, and removable securing means whereby the said lugs or projections are retained in the said recesses and the parts of the grate thereby held assembled.

7. In a furnace-grate, in combination, the sidebars having near the opposite ends thereof the open-topped pockets and'also having at said ends the slots or recesses 0 c. the cross-bars a a occupying said pockets and shouldered to engage with said side-bars and hold the same from lateral movement, the grate-bars extending parallel with the said side-bars, the grate-bar actuator extending transversely with relation to the said side-bars and having its ends supported by the latter, the headers resting upon the sidebars, projecting over the ends of the grate bars, and having the depending lugs or projections entering the said slots or recesses, and the removable pins applied to the said depending lugs or projections to re tain the latter in the slots or recesses and thereby hold the assembled parts of the grate locked in Working relations.

8. 111 a furnace-grate, the combination with a supporting-frame having at each'end of the grate roll-supporting and guiding rails arranged parallel with one another in an open series extending crosswise of the grate, and a series of loose rolls arranged end to end upon each series of said rails, each of said rolls resting upon two of said rails and rolling independently along the same in unison with the lengthwise movement of the corresponding gratebar. each roll having flanges engaging with the rails upon which it rests preventing transverse movement of the roll, and with the corresponding grate-bar preventing transverse movement of the latter, of the grate-bars, each taking widely separate bearings upon the corresponding rolls to prevent transverse tipping of the grate-bar, and means to reciprocate the grate-bars lengthwise.

S). In a furnace grate, the combination with the sidebars provided with bearings and with shoulders adjacent the same, of the gratebars, grate-bar supports sustained by the said side-bars, the headers, and the rocking actuator for the said grate-bars, mounted in the said bearings of the said side-bars, adapted to move the grate-bars lengthwise upon the said supports, and limited as to its.

rocking movement through engagement with the shoulders of the sidebars, whereby the grate-bars in their lengthwise movement are prevented from striking the headers.

In testimony whereof I aflix my signature, in presence of two witnesses.

WARNER JOHNSON.

Witnesses:

JOHN E. Anno'r'r, WM. A. MAennon.

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