US1328611A - Stoker - Google Patents

Description

M. ALPERN.

STOKER.

APPLICATION FILED FEB. 25. 1914.

Patented Jan. 20, 1920 3 SHEETS-SHEET I.

Patented Jan. 20, 1920.

3 S HEET$SHEET 2.

M. ALPERN.

STOKER.

APPLICATION FILED FEB. 25, 1914.

M. ALPERN.

STOKER.

APPLICATION FILED FEB. 25, 1914.

1,328,631. 1 Patented Jan. 20, 1920.

3 SHEETSSHEET 3.

NITED STATES PATENT OFFICE.

MAXWELL ALPERN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR 'IO AMERICAN ENGINEERING COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

STOKER;

Patented Jan. 20, 1920..

Application filed February 25, 1914. Serial No. 820,903.

To all whom it may concern:

Be it known that I, MAXWELL ALPERN, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Stoke rs, of which the following is a specification.

One object of my invention is to provide a novel form of stoker whose construction shall be such that its grate sections when properly actuated shall force the ashes toward the bridge wall of the furnace and thereby crush the larger sized clinkers', it being further desired to provide a stoker having the above characteristics which shall be relatively simple and substantial as to its design and arrangement of parts and which moreover shall include novel means for dumping the ashes.

I also desire to provide a novel form of stoker grate and support therefor particularly designed for reciprocation toward and from the bridge wall, the invention also contemplating novel and relatively simple means for causing such operation.

These objects and other advantageous ends I secure as hereinafter set forth, reference being had to the accompanying drawings, in which:

Figure 1 is a vertical section of the furnace of a stoker illustrating my invention as applied thereto;

Fig. 2 is a plan of the apparatus shown in Fig. 1, and

Fig. 3 is a side elevation partly in vertical,

section and on a smaller scale than Figs. 1 and 2, showing my invention with the parts associated therewith.

In the above drawings, 1 represents a portion of the main frame structure of an underfeed stoker, which for example may be of the Well known Taylor type extending transversely of the furnace in which it is installed and having mounted between it and a bridge wall 2 an overfeed grate consisting of a series of transversely extending grate bars or sections 3 terminating in a bottom bar 4:. Below and to the rear of this latter is a series of elongated dumping plates 5, all pivoted on a transversely extending shaft 6 from which they extend into the immediate vicinity of the bridge wall 2. All of these plates are connected adjacent their outer or rear ends by a transversely extending bar 7 having at intervals downwardly extending arms 8 to each of which is connected a link 9 attached to any suitable operating mechanism whereby said dumping plates may be caused to turn on their supporting pivot shaft 6, from the position shown in full lines in Fig. l to a position in which'they are I substantially vertical, for the purpose of dumping ashes which may have accumulated upon them.

Projecting forwardly from the main structure 1 which forms part of the wind box of the stoker, is a relati 'ely heavy bottom plate or casting 10 lying in a substantially horizontal plane and supported in any suitable manner at the sides of the stoker, as well as from said structure 1. Slidably mounted on the rear of this plate is a relatively narrow transversely extending plate 11 rigidly fixed to the bottom grate bar or section 41 and having at its rear edge a trans versely extending rolled section suchas the angle iron 12. At substantially its middle point this angle iron has fixed to it a forwardly projecting lug 13 connected by a pair of links 1 1 to an arm 15, fixed to a spindle l6 'rotatably mounted in a bearing 17 carried by the bottom plate 10. Said spindle extends below said plate and on its lower end has fixed a bell crank lever 18, one of whose arms is connected through a link 19 to any desired mechanism whereby it is caused to oscillate, while a second arm is connected through a link 19 to a similar bell crank lever (not shown) belonging to another stoker. I

In addition to the lug 13, the angle iron 12 has fixed to it a series of brackets or lugs 20, to each of which isconnected a grate reciprocating bar 21. As shown in Fig. 1, each of'the grate sections or bars 3 has at its rear end a downwardly projecting lug 22 which is bolted or otherwise connected to this bar 21, the topmost grate bar having also one or more elongated projections 23 each rounded at its lower end so as to be slidable on a supporting bracket 24: which thus constitutes a slideway.

Each of the grate bars is shown as being in the form of a transversely extending plate downwardly flanged along the rear edges and upwardly flanged at the front edges and when assembled as shown in Fig. 1, the flanged rear edge of each bar rests upon the front upper face of the bar next below it, having openings through which air delivered from the wind box escapes into the fuel from the chamber formed by the grate bars, the plate and the front face of the frame-work 1. It is to be understood, however, that other forms of grates may be em- 5 ployed, without departing from my invention. The topmost grate bar 3 extends under the downwardly inclined edge'26 of a top plate 27 which forms the bottom of one of the retorts 28 of the stoker and under op- 0 erating conditions as the bell crank lever 18 is oscillated with its spindle 16, the whole series of grate bars is likewise reciprocated relatively to the bridge wall 2, the turned over edges of the said bars constituting a'butments which are alternately withdrawn from and projected under the mass of fuel and ashes lying upon them. As a result, any large clinkers are more or less broken as they are caught and crushed between the 20 bridge wall and these substantially vertical edges of the grate bars, each series of which is slidably and independently supported on brackets 24: (of which there may be any 7 suitable number) and the front end of the 25 bottom plate 10.

The grate bars of the sections 3 are supplied with air under pressure delivered from the wind box through an opening controlled by a damper mounted to swing on a hori- 30 zontal pivot'and controlled in any suitable manner from the front of the stoker. As is customary in stokers of the type to which my invention is applied, air under pressure flows from the wind box through the twyers 29 from which it is delivered into the fuel.

It is to be noted that while the grate bars or sections 3 are illustrated with their top faces somewhat inclined, they may be substantially horizontal or in some cases made 40 in widely varying forms without departing from my invention, which contemplates a. construction providing an overfeed grate which extends transversely below a retort or series of retorts in combination with a bridge wall and mechanism whereby under operating conditions the grate is reciprocated bodily toward and from said bridge wall.

I claim:-

1. In an underfeed stoker, the combination of downwardly inclined series of twyers; a retort between said twyers and having a relatively fixed'bottom; a. wind box; a downwardly inclined reciprocable grate mounted below said retort; plates associated with said grate to form a casing connected to receive air under pressure from the wind box; with means wholly outside and independent of the retort for reciprocating said grate including a member connected to a source of power and means extending into said casing connecting said member to the grate.

2. The combination in a stoker, of a supporting frame having a bottom plate provided along one edge with a bearing surface;

brackets each having a bearing surface and supported by the frame above said bottom plate; a member elongated transversely of the stoker furnace and slidably engaging the bearing surface on the bottom plate; a series of grate sections each bearing along one edge on the next lower section, the topmost section slidably engaging the bearing surfaces of the brackets; bars respectively connecting all of the grate sections with the slid-able member; with means for bodily reciprocating said grate.

3. The combination in a stoker, of a supporting frame; a grate bodily movable thereon and composed of a series of sections elongated transversely of the stoker furnace, each of said sections having :1 depending edge engaging the next lower section; bars connecting the rear portions of all of the sections; a slidably guided member extending transversely of the stoker and connected to all of said bars; and means connected to said member for reciprocating the grate on the supporting structure.

4. The combination in an inclined underfeed stoker of series of downwardly inclined e bridge wall; with means for moving said grate toward and from said bridge wall to 95. crush the clinkers between the latter and itself, consisting of a fixed structure includ ing a substantially vertical bearing; a vertically extending pivot spindle mounted in said bearing; a lever arm fixed to said spindie and connected to a source of power. with a second arm on the spindle connnected to the outer portion of the grate.

5. The combination in a stoker, of a supporting structure having upper and lower bearing surfaces; a grate formed of a series of sections elongated transversely of the stoker furnace, the -'top and bottom grate sections slidably co-acting with the bearing surfaces of the supporting structure; a series of forwardly inclined bars for connecting all, of the grate sections together;

a transversely extending member connected to all of said bars; and mechanism connected to said member for reciprocating the grate on the supporting structure.

6. The combination in a stoker, of a supporting frame having a bottom plate provided along one edge with a bearing surface; brackets each having a bearing surface and supported by the frame above said bottom plate; a member elongated transversely of the stoker furnace and slidably engaglng the bearing surface on the bottom plate; a series of grate sections each bearing along one edge on the next lower sec tion, the topmost section slidably engaging the bearing surfaces of the brackets; bars respectively connecting all of the grate sections with the slidable member; with means connected through said slidable member for bodily reciprocating said grate.

7. In an underfeed stoker the combination of downwardly inclined series of twyers; a retort between said twyers; an inclined grate extending transversely at the lower end of the latter; a bridge wall; and means outside and independent of said retort for moving the grate bodily toward and from said bridge wall to crush the clinkers between the latter and itself.

8. In an underfeed stoker the combination of downwardly inclined series of twyers; a retort between said twyers; a grate composed of a series of parallel sections mounted one above the other in stepped relation and extending transversely of the stoker furnace below the bottom of said retort; a bridge wall; and means outside and independent of the retort for bodily moving said grate toward and from the bridge wall.

9. In an underfeed stoker the combination of downwardly inclined series of twyers; a retort between said twyers including a relatively fixed bottom structure at its rear lower part; a grate composed of a series of independently removable parallel sections extending transversely of the stoker furnace in stepped relation below the retort and each having an elongated substantially vertical face; a bridge wall; and means below the bottom of the retort for moving the grate bodily toward andfrom the bridge wall.

10. In an underfeed stoker the combination of downwardly inclined series of twyers; a retort between said twyers; supporting means below the retort including a slideway and a supporting plate below and to the rear thereof; an inclined grate extending transversely at the lower end of said retort and having its forward upper end carried by the slideway and its lower rear end on said plate; a bridge wall; and mechanism for causing the grate to move on said slideway and plate toward and from said bridge wall.

11. In a furnace stoker, retorts having relatively stationary bottom plates; overfeed grates sections located below said stationary bottom plates; ash receiving dumping grates plates over said dumping grates and toward and from the furnace bridge wall.

12. In a furnace, retorts having relatively stationary bottom plates; overfeed grate sections located below and to the rear of said bottom plates; ash receiving dumping plates located below and to the rear of said overfeed sections; a wind box for supplying said overfeed sections with air under pressure; and means structurallv independent of the retort structure for causing said overfeed sections to move bodily toward and from the furnace bridge wall. I

13. In a furnace, retorts having relatively fixed bottom plates; ash receiving dumping plates extending transversely at the rear of the furnace; a series of air discharging over-feed grate sections mounted to reciprocate beneath said fixed bottom plates and over the dumping plates; and means for reciprocating said overfeed sections.

1+. In a furnace an under-feed stoker section comprising retorts having bottom plates and side walls; ash receiving dumping plates located at the rear of the furnace; inclined over-feed grate sections mounted for movement below and independently of said bottom plates and over said ash receiving dumping plates; means for bodily moving said overfeed sections toward and from the furnace bridge wall; and means forsupplying said overfeed sections with air under pressure.

15. In a furnace, retorts having relatively stationary bottom plates and side Walls; pivotally mounted ash receiving grates below and to the rear of said retorts; a series of inclined air supplying overfeed grate sections extending transversely of the furnace between said retorts and said ash receiving grates and adapted to reciprocate below and independently of said retort bottom plates and above said ash receiving grates; means for supplying said overfeed grates with air under pressure; and means for reciprocating said overfeed sections toward and from the furnace bridge wall.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

MAXWELL ALPERN.

\Vitnesses M. EMMA BURGESS, CHARLES L. SMITH.

Images