US864946A - Stoker for furnaces. - Google Patents

Description

N0.'864,946. PATENTED SEPT; 3, 1907.

- E. BRETNEY.

STOKER'FOR FURNACES.

- APPLICATION FILED r213. 16. 1907.

2 SHEETS-SHHET 1- aww No. 864,946. PATENTED SEPT. 3, 1907.

5. BRETNEY. STOKER FOR FURNACES.

APPLICATION FILED FEB-1B. 1907.

I 2 SHEETS-SHEET 2.

W/ TIVESSESZ //VVA/ ,5 My ,Ezgyeneflrane y,

UNITED STATES PATENT OFFICE.

EUGENE BRETNEY, OF INDIANAPOLIS, INDIANA, ASSIGNOR OF TWO-THIRDS To EDWARD H.

SCHMIDT AND L; PVROTHCHILD, OF INDIANAPOLIS, INDIANA.

I STOKER FOR FURNACES;

Specification of Letters Patent.

Application filed mangle- 190v. Serial No. 358.090.

To all whom it mag concern:

Be it known that I, EUGENE BRETNEY, a citizen of' the United States, residing at Indianapolis, in the .county of Marion and State of'Indiana, havejnvented certain new and useful Improvements inStokers for Furnaces, of which the following is a specification.

This invention relates, to improvements in grates for furnace fires for steam heating plants, and similar purposes, and theobject of the invention is to provide endless traveling grate-bars mounted obliquely to the horizontal, and sloping downwardly from front to rear of the lire-box, said gtate-bars being mounted on a track on a suitably wheeled truck topermit of ready withdrawal from under the boilers for cleaning and repairs.

Another and important object of the invention is to provide a screw-conveyer for carrying the fuel from front to rear of the gratebars, underneath the-latter, and screw .conveying means for elevating the fuel and discharging it upon the lower rear end of the traveling grate-bars.

I accomplish the objects of the invention by the mechanism illustrated in the accompanying drawings, in which Figure 1 is a detail in vertical section of a fire-box equipped with my invention, the view being taken on a plane extending from front to rear ofthe fire-box at right angles to the furnace-front. Fig.2 is a detail in vertical section on the line 2-2 of Fig.' 1, and'Fig. 3 is a horizontal section of one of the vertical screw-conveyers.

Like characters of reference indicate like parts throughout the several views of the drawings. I

5 represents a' boiler for generating steam, .of any usual and suitable construction, here shown as a tubu- 9 is a truck having the wheels 10 resting upon the track' 8. This construction permits the truck 9 to be moved on the track in and out under the fire-box 7.

12 is a horizontal upper shaft and 13 a parallel lower shaft, both of which are mounted in journal-boxes supported by the upwardly extended sides of the truck 9.

14 are sprocket-drums mounted upon each of the shafts 12 and 13, and 15 is a traveling or chain grate forming an endless apron which passes around both of the drums 14. The shaft 12, beinghigher than the shaft 13, causes the upper end of the traveling grate 15 to elevated. The upper shaft 12 has a pulley 16 (shown in dotted lines -Fig. l), which is driven from any suitable motor by the belt 17.

Located under the traveling grate 15 are a series of horizontal conveyor-troughs 18, the number depending upon the .width of the fire-box, which may vary with the size of the boilers. Each of these conveyer-troughs Patented S ept. 3, 1907.

is provided with a longitudinal screw-conveyer 20, the front end of the shaft of which carries the bevel gear wheel 21.

22 is the oblique bottom of coal-chute located under, the traveling grate 15 and into this chute the coal to be used as fuel will dumped, and will, be deposited by gravity upon the conveyors 20 in'the troughs 18. Supported by the truck 9 and located at the rear of each of the troughs18 are the inverted.

conical, vertical, coal chutes 24. These have inlet openings 25 at their lower ends at diametrically opposite sides of the chutes. Each of those vertical chutes 24 have their lower ends located'in the extensions 26, of the chutes 18. The bottoms of the extensions 26. are oblique, ,and slope downwardly from the chutes 18 so as to carry the fuel from the ends of the latter, by'gravity, to the openings 25 in the vertical chutes 24. The upper ends of the chutes 24 terminate above the lower inner ends of thetraveling grate 15, and have the forwardly oblique deflecting plate 30 to direct the discharge'from the chute in the direction of the grate-bar. The upper end of the chute 24 also has the oblique plate 31, down which the fuel discharged from said chute will travel by gravity and will'be deposited upon the traveling grate 15. Located within the chute 24 is the vertical screw-conveyor 33, the wings of which increase in width or-radius from the lower end of the chute outwardly to correspond with the increase in diameter of the conical walls of the chute. The object in mak-' ingthe walls of the chute 24 of gradually increasing diameter from lower to upper'end'of the chute is to avoid the pa'ckingof the fuel within said chute; and

to prevent the fuel contents of the vertical chute from being carried around by the conveyor-screw without advancing upwardly, the walls of the chute will be provided with the longitudinal corrugations 34. The walls of these corrugations, on the side toward which the conveyer is traveling, will preferably be more abrupt than the other wall. of the same corrugation so as to more positively resistthe motion of rotation imparted by-the screw-conveyer. I

Mounted on the truck 9 are the horizontal shafts 38.

These shafts will be geared together by' any suitable means, here shown as by means of a link belt 40, which connects the sprocket-wheels 41 mounted on each of said shafts 38.

42 is a ratchet-wheel here shown forward end of one of the shafts 38. i 43 is a yoke mounted on the'shaft 38, over the sprocket wheel 42, and having a lever extension by means of which the yoke is reciprocated.

44 is a pawl, carried by the yoke, which engages the teeth of the ratchet-wheel 42 so as to move the ratchetas mounted on the wheel forward by the reciprocatory movement of the yoke and its lever. The swinging movement of said lever and yoke will be imparted in any suitable manner. i

Carried by the truck 9 and mounted at right angles to the shafts 38 are an equal number of vertical shafts 50. Mounted on the upper end of each. shaft 50 is a beveled pinion 51 meshing with the beveled wheel 2]. on the shaft of the conveyor 20, and mounted on the lower end of each shaft 50 is a bevel'wheel 53 which meshes with a like bevel wheel 54 on the adjacent shaft 38. The inner end of each shaft 38 carries a bevel wheel 56 which meshes with a bevel wheel 57 on tholower end of the shaft of the adjacent conveyer.33.

liy the above construction, the rotation of shafts 38' will impart a simultaneousrotary .movement to both screw- conveyors 20 and 33.

My invention is capable of variation in many of its details of construction Without departing from the spirit of this invention, and I therefore do not desire to be limited to the exact device shown, but

chute at the rear of the grate having a top discharge upon said grate the interior walls of said chute having longitudinal channels, a conveyer-screw rotating in said chute,

a second chute under the grate discharging into the lower end of the vertical chute and a conveyer-screw rotating in said second chute.

2. in a furnace, a grate, an upright-fuel chute at the rear of the grate having a top discharge upon said grate, the diameter of said chute increasing gradually from bot tom to top, the. interior walls of said chute having longitudinal channels, a conv'e'yer-screw rotating "in said chute and means, for supplying fuel to the lower end of said chute.

2;. in a furnace, a grate, an upright fuel-chute at the rear of the grate having a top discharge upon said grate,

the. diameter of said chute increasing gradually from bottom to top, inside longitudinal channels in said chute having angular walls one of which is in a plane approximately radial with relation to the center of the chute, a longitudinally,disp osed revoluble conveyor-screw in said chute rotating toward the radially disposed walls of the longitudinal chute-channels, and means for delivering fuel to the bottom of said chute.

4. In a furnace, a movable grate sloping upwardly from rear to the front of the fire-box, an upright fuel chute discharging upon the rear of the grate said chute having a gradual increase in diameter from the bottom to the top with annular longitudinal inside corrugations, a conve yerscrew rotating in said chute said screw standing longitudinally ofthe chute and having blades increasing in width proportionately with the increased diameter of the chute said chute having bottom inlets, a second chute under the grate discharging into the lower end of the upright chute, a conveyer-screw rotating, in the second chute, and means for advancing the grate to gradually carry the fuel from back to the front of the firebox.

5. In a furnace, a truck 'mounted on wheels a grate mounted on said truck, an upright fuel-chute at the rear of the grate having a top discharge upon said grate and carried by said truck, a convey'er-screw rotating in said chute, a second chute under the grate carried by said truck and discharging into the lower end ,of the vertical-chute and a conveyor-screw in said second chute.

6. In a furnace, afire-box, rails forming a track on the floor below the fire-box and extending out forwardly of the furnace, a truck, flanged wheels on said truck whereby the latter is mounted on said track, a movable grate sloping upwardly from rear to front of the fire-box and mounted on said truck, an upright fuel chute at the rear of the grate having a top discharge upon said grate, said chute EUGENE BRETNEY. [13. 5.]

' Witnesses;

F. W. Wommnn, L. B. WoimNna.

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