US703450A - Mechanical stoker. - Google Patents

Description

No. 703,450. 0 Patented July I, I902.

A. F. NAGLE.

MECHANICAL S-TOKER.

(Application filed July 6, 1901.) (No Model.) 3 Shasta-Sheet I.

Patented July I, I902. A. F. NAGLE.

MECHANICAL STOKER.

(Application filed July 8, 1901.)

3 Sheets-Sheet 2,

- TTELE.

(No Model.)

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w nun-ii No. 703,450. Patented lu|y 1902.

A. F. NAGLE.

MECHANICAL 'STDKER. A lie'atibn filed July 6, 1901.

' 3 Sheets-sheaf a.

(No Model.)

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' UNITED STATES PATENT OFFICE.

AUGUSTUS F. NAGLE, OF MONTCLAIR, NEW JERSEY, ASSIGNOR TO EARLE H. GOWING, OF READING, MASSACHUSETTS.

MECHANICAL STOKER.

SPECIFICATION forming part of Letters Patent No. 703,450, dated July 1, 1902.

Application filed July 6, 1901. Serial No. 67,343. (No model.)

To all whom it 77%(LZ/007ZCQ77L. I

Be it known that I, =AUGUSTUS F. -NAGLE, of

Montclair, in the county of Essex andState of New Jersey, have invented certain new and of which the following is a specification.

My invention relates especially to furnaces having an inclined bottom and to stokers therefor in which the screw conveyer supplies to coal continuously'to the rear end of the furnace and deposits it upon the upper portion of the inclined bottom, down which it is carried by gravity and-by the impelling force of thescrew. These inclined bottom plates are corrugated longitudinally, made independently removable, and are separated by raised. myers, which supplyblasts of hot air-projected laterally downward from vents in the'upper part of each lateral face. I provide a plu- 2o rality of screwv conveyers, each discharging down the incline at the rear of the furnace between adjacent rows of twyers in the directiontoward-the furnace-door. These conveyers may lead direct from a hopperbeyond the rearwall; but under a special feature of my invention the main conveyer rises 0bliquely beneath the furnace-bottom from the hopper in front to a transfer-chamber in the rear, where another screw, geared to the shaft of the main screw, reverses the directionof movement of the coal and discharges it into the furnace. At the foot of the incline there are horizontal bottom plates, on which. also combustion occurs, and ashesgatherto be re- 3 5 moved through the front door'on alevel therewith. An opening is formed through the front wall at a higher level and provided with a transparent or other door to afford a view of the interior of the furnace.

In the drawings, Figure 1 is a longitudinal vertical section through a furnaceand stokingapparatnsembodyingmyinvention. Fig. 2 is a transverse vertical section thereof on line 2' 2 'of Fig; 1. Fig. 3 is a vertical-section 5 showing the hopper at rear of the furnacem' Figs. 4, 5, and 6 are details of the reversing;

conveyer, and Fig. 7 an enl a rged cross-sec:

tion of the peculiar twyer and floor-supports "inspection of the interior of chamber E. 5 useful Improvements inMechanical Stokers, j

D is the boiler, suitably mounted over the fireor combustion chamber E, F the ashdoor, and G an openingin the front wall for The floor I of the combustion-chamber at V the front is' horizontal and about 'level with 'o the door F; but the rear portion H inclines quite sharply upward therefrom and is formed of 'a series of corrugated metal plates, each resting marginally upon the oblique portion ofthe inclined and horizontal beams J, sup- ,ported by the front and rear walls A B, Fig. "1. The plates II and I are-separately removable, so that a new one can at any time be substituted. Theremay be a horizontal ledge or plate at the rear of the inclined fioor, as indicated in Fig. 1;.but this is not essential.

jBetween adjacent plates Hiare rows of hollow twyers'K, supported on theibeams J and suitably secured-in position,"preferably by twyer and keyed fast underneath. At all other points there is open spacebetween the beams, admitting air under pressure from beneath into the twyers and thence into the combustion-chamber through downwardlyextending vents 7c in each lateral face.

The fuel from hopper M is introduced through the rear wall B, at top of the inclined bottom H, by means of a screw conveyer suitably actuated. In Fig. 3 the hopper is located at the rear, the conveyer-tube N and screw 0 run direct therefrom to the furnace, andthe coal is discharged upon the upper endlo'f, the incline, as stated. In the apparatus shown in Figs. 1 and 2 the hopper is in front, the main conveyor P Q rises obliquely from it, beneath the furnace-bottom, to a transfer-chamber R in the rear wall. From 0 this chamber a return-tube S extends to the furnace "at top of the incline and incloses a short reversing conveyor-screw T. The shafts of screws Q and T are connected by suitable gearing U, and when motion isimparted to screw Q the coal brought into chamber R is discharged by screw T into the furnace at top of the inclined floor..

By-reference to Fig'sJl and 2 it will'beseen that each return-tube S and its inclose'd screw T is in position to discharge the fuel upon the corrugated inclined plate H, between the rows of twyers K, where combustion will take place as the fuel gradually works downwardly to the lowest floor-level. The mechanism will be driven by a suitable motor, as V,Fig. 1.

I claim as my invention 1. The combination with a furnace having a downwardly-inclined combustion-surface and an ash-door opposite the lower end thereof, said combustion-surface being constructed to retain the unconsumed material for removal through said door, of a furnace-stoking apparatus adapted to supply fuel to the combustion-chamber through the rear wall thereof and to project such fuel upon said inclined surface.

2. The combination with a furnace having in its rear portion forwardly-inclined combustion-plates and a door opposite the lower end thereof, the entire floor of the combusterposed elevated twyers, of a plurality of screw conveyors introducing fuel through the rear wall and depositing it on said inclined plates between adjacent rows of twyers.

In testimony whereof I have aflixed my signature in presence of two Witnesses.

AUGUSTUS F. NAGLE.

Witnesses:

A. FRED .NAGLE, .Tr., G. F. BROWN.

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