US1563708A - Mechanical stoker - Google Patents

Description

Dec. 1 1925. v

- R. B. HOLTHAUS ET AL MECHANICAL STOKER F l June 9. 192; 5 Sheets-Sheet l R. B. 'HOLTHAUS ET AL Dec. 1, 1925.

MECHANI CAL STOKER .5 Sheets-Sheet Filed June 9.

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RB. HOLTHAUS ET AL MECHANI CAL STOKER Filed June 9, 1923 5 Sheets-Sheet 4 RBEZi/Zaua,

5m z'f/ZJ Dec. 1,1925. 1,563,708

R, B. HOLTHAU-S ET AL MECHANICAL STOKER Fil d June 9. 1923 5 Sheets-Sheet 5 $7.25-

ap SmZf/Z Patented Dec. '1 1925.

. 1,563,708. UNITED STATES PATENT OFFICE.

mmsronn 3. non-runes AND GEORGE D. SMiTH, oE EnEMon'r, NEBRASKA.

MECHANICAL STOKER.

Application filed June 9,

. do hereby declare the following to be a full,

clear, and exact description of the invention,

such as will enable others skilled in the" art to which it appertains to make and use the same. v

The main object of the present invention is the rovision of means for automatically isupplylng fuelto the firebox of a locomotive engine, said means embodying a crusher for breaking up the lumps of coal and reducing the same to a convenient size for automatic feding, a conveyor for moving the fuel from the bunker to the firebox, and means for distributing the fuel in the firelgog to -insure a uniform level of the firee H 4 I Other objects and advantages will be apparent and suggest themselves asthe nature of the invention is understood.

Whilethe drawings illustrate an embodiment of the invention it is to be understood that in adapting the same to meet different conditionsia nd requirements, various changes in the form, proportion and minor details of construction may be' resorted to without departing from the nature of the invention.

' Referring to'the accompanying drawings forming a part of the application:

Figure 1 ls a d1agrammat1c .v1ew1llustrative of the invention Figure 2 is a view of the forward portion of the conveyor substantially in' central vertical section, I

Figure'3 "is a sectional view of the lower partly in section of the means for imparting an oscillating movement to the delivery end of the conveyor and controlling the supply of steam to the nozzle,

Figure 7 is an enlarged detail sectional view of the valve mechanism for controlling RAINSFORD B. HOLT- 1923. Serial No. 6441415."

the supply of steam to the nozzle takenion the line 77 of Figure 6,

Figure '8 is a section on the line 8-8 of Figure 7 F'gure 9 is a plan View of theivalve seat having the crescent shaped port,

Figure 10 is a detail view of the joint between adjacent sections of the conveyor conduit or casing, the parts being separated,

Figure 11 is adetail sectional View of the joint formed between adjacent sections of the conveyor on the" line -11'11 of Figure 3,

Figure 12 is a sectional detail view line 1212 of Figure 3,

Figure 13 is a-sectional line 13--13 of Figure 3, and

Figure 14 is a detail view of the adjust v I able joint in the length of the steam pipe.

Corresponding and like parts are referred to in the following description and desigon the detail View on the I nated in the several views of the drawings by like reference characters.

- The numeral 1 designates the rear wall of the firebox of alocomotive engine and' 2 the grate. The delivery end of a conveyor extends into the firebox 3-'adjacent the rear wall 1 and terminates in a laterally disposed nozzle 4 which is so arranged as to deliver I the fuel over the bed in the firebox. The

delivery portion of the conveyor is. vertical ly disposed and is mounted .to receive; .an'

oscillatory movement whereby the fuel is distributed throughout the firebox. The de livery portion of the conveyor comprises a vertically disposed conduit or casing, 5-

terminating at its upper end in the laterally disposed nozzle 4. A screw conveyor 6 is mounted within the casing 5 and positively moves the fuel therethrough. The lower end of the casing 5 is connected to the ver-' tical extension 7 of the horizontal portion of the conveyor by means of a swivel joint 8 which may be of anypreferred construction. A jacket 9 surrounds the upper portion of the casing 5 and is supplied with. steam from the boiler by means of a pipe 10', a pipe '11 conducting the steam from the jacket 9 to a valve mechanism which, controls the supply of steam to a pipe 12 terminating in a nozzle 13 opposite the nozzle 4, .whereb to forcibly discharge the fuel through t e nozzle 4 and over the bed of fuel in the firebox; The delivery portion of the pipe 12 extends through the jacket 9 and the nozzle 13 opens intothecasing 5 a point opposite the ILQZZIQ whereby the blast is discharged across the upper end.

of the boiler and reduce the friction'to the crushing rolls 19 and a conveyor 20. The crushing rolls 19 break smallest amount possible. The several steam pipes 10, 11, 12 and 14 are in sections connected by a yieldable connection or joint as designated at 10, 11 12 and 14, respectively, and as shown in detail in relation to pipe 14, in Figure 14; the same structure being carried out in regard to joints 10F, 11, and 12. Each of such connections-or joints is rotatably mounted-on one of the ipe sections, designated A in Fi ure 14, and slidably connected at B to the other section of the same pipe.

Cog teeth '16 are provided on the casing 5 and cooperate with a rack bar 17 whereby to oscillate the casing 5 and swing the nozzle 4 from one side to the other of the firebox whereby to distribute the fuel throughout the same to maintain a uniform depth of fire. A small engine 18 imparts a reciprocatory movement to the rack bar 17 with -the result that the casing 5 is oscillated. The

engine 18 may be of any approved construction suitable for the purpose.

The numeral 17 designates a coal bunker and a trough 18 is in communication with the bottom thereof and contains a pair of portion of a screw up lumps of coal and reduce the same to suitable size to be fed to the firebox by means of the conveyor. A conduit or casin 21 leads from the deliver 18 to the lower end of tlie casing 5 and the screw conveyor 20 operates therein. The crushing rolls 19 are geared at one end as indicated at 22 and one of the crushing rolls is geared at the opposite end to the screw conveyor 20, as indicated at 23. A suitable motor 24 is connected by means of a tumbling rod or shaft 25 with the screw con:

end of the trough veyor 20. Said rod or shaft 25 is in flexibly connected sections 25. The screw conveyor 20, its casing 21 and the shaft 25 comprise universally jointed sections; Bevel gearing 26 connects the shaft 25 with the screw conveyor 6 and gearing 27 connects the opposite end of the shaft with the screw com'eyor 20. The casing comprises sections 21, 21 and 21 which are coupled by means of separable universal joints 28 and the screw conveyor 20 is likewise formed of sections which are coupled by means of separable universal or the purpose of illustration,

joints29 whereby, in the event of the tender .separating from the locomotive, the parts of The valve mechanism for controlling the supply of steam to the nozzle 13 comprises a casing .31 in which is located a valve seat 32 and a valve 33. The supply pipe 11 connects with the valve casing 31 upon one side of the valve seat 32 and the distributing pipe12 connects with the valve casing 31 upon the opposite side of the valve seat 32. It will thus be understood that the valve mechanism is located between the supply anddistributing pipes The valve receives an oscillatory movement, and is held "upon the seat32'by means of a spring 34.

The stem 35 of the valve 33 is connected by means of an arm 36 with the rack bar 1.7 and in this manner, the valve mechanism controlling thesupply of steam to the nozzle 13 is operated simultaneously with the delivcry portion 5 of the fuel feeder. The-port 37.v in the valve seat 32 is of crescent form, thereby diminishing from a central point towards opposite ends. The port 38 in the valve 33 consists of an opening correspond ing with a middle portion of the port or opening 37. When the nozzle 4 isintermediate its extreme movements, the valve 33 occupies a position with the opening 38 opposite the center of the port 37 and as the nozzle 4 moves to one side or the other, the valve 33 correspondingly moves, thereby causing the opening 38 to'move over an end 3' portion of the port 37, thereby reducing the sup 1y of steam and the force of the delivery at t e nozzle 13. WVhen the nozzle 4 points straight ahead, the distance to the front wall of the firebox is greatest and when the nozzle 4 extends laterally in either direction, the distance between it and a side wall of the firebox is materially reduced, hence the force of the blast is proportionately reduced. As a result of the arrangement, the strength of the'blast delivering the fuel is proportionate to the distance of distribution and this is taken care of by means of the'valve mechanism comprising the elements 32 and Ill! fuel throughout the firebox, means to deliver a blast of steam across said movable section and through said nozzle to effectively deliver the fuel, and means operated by the 'first mentioned means to vary the force of the blast. I

2. In a mechanical stoker, a fuel feeder comprising a vertical and a horizontal portion, said vertical portion including a discharge nozzle and a conduit for the fuel,

means for imparting an oscillatory movement to said vertical section and discharge nozzle, means todeliver a blast of steam across said vertical section and through said nozzle to effectively deliver the fuel, and means operated by the first mentioned means to vary the force of the blast.

In a mechanical stoker, a fuel feeder having a conduit section constituting a discharge nozzle, means to automatically veyor, means. for automatically imparting an oscillatory movement to the delivery portion of the conveyor, and a valve mechanism controlled by the operating means for the delivery portion of the conveyor, whereby to regulate the force of the blast so as to project the fuel different distances.

5. In a mechanical stoker, a fuel feeder having a movable section functioning dually as a discharge nozzle and as a feed conduit, means operating automatically to impart an oscillatory movement to said movable section in order to distribute the fuel throughout the firebox, means to deliver a blast of steam across said movable section and through said nozzle to effectively deliver the fuel, and a control valve for said last mentioned means operating under control of the first mentioned means to vary the blast from the nozzle, said valve including plates one movable relatively to the other and having coacting ports, one of the ports being substantially crescent shape to control the supply of steam so as to project the fuel different distances.

In testimony whereofwe afiix our signatures.

RAIN SFORD B. HOL'IHAUS. GEORGE D. SMITH.

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