US1168367A

US1168367A - Mechanical stoker.

Info

Publication number: US1168367A
Application number: US69355512A
Authority: US
Inventors: Otto Wundrack
Original assignee: Individual
Current assignee: Individual
Priority date: 1912-04-27
Filing date: 1912-04-27
Publication date: 1916-01-18
Anticipated expiration: 1933-01-18

Description

0. WUNDHACK.

MECHANICAL STOKER.

APPLICATION man APR. 27, 1912.

19168936?, Patent-ed Jan. 18, 1916.

3 SHEETS-SHEET 2.

Aff@ 772 gg MMM zy W O. WUNDRACK.

MECHANICAL STOKER.

APPLICATION FILED APILzr, I9Iz.

Patented Jan. 18, 1916.

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i1 naar rca OTTO WUNDRACK, MAYWOOD, ILLINO-IS.

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incase.

Y .Specification of Letters Patent.

. Patented Jan. i8, i916.

Application led April 27, 1912. Serial No. 693,555.

rlhis invention relates to mechanical' stokers, and has for its object to provide a newv and improved device of this description.

The invention is illustrated inthe accomp anying drawing whereins Figure 1 is` a front view with parts broken away of a furnace supplied with a Stoker; Fig. 2 is a sectional-view takenl on line 2-2 of Fig-1; Fig. 3 is-an enlarged side view of the upper part of the'front end of the boiler shown in Fig. 1; Fig. 4

is an enlarged sectional view showing the4 grate bars; Fig. 5 isa view similar to Fig. 3 showing a hand operating device.

Like numerals'refer to like parts throughout the several'igures.

As illustrated in the accompanying drawings, the device is applied to an ordinary steam boiler furnace for feeding fuel thereto.

rlhe fuel is placed in the receptacle or hopper 1 extending along the front of the boiler. As shown in Fig. 1` this hopper is provided with

inclined bottom pieces

2 and 3, having between them a discharge opening 4. Associated with this discharge opening is a feeding wheel 5 provided with pockets for receiving the fuel-and adapted 'when ro` tated to feed the fuel regularly and uniformly. Beneath the feeding wheel is an inclined grate made up of a series ofy grate bars 6. These bars are pivotally supported at their upper edges by meansof the pivots 7. These bars extend downwardly in an inclined direction as illustrated in Fig. 2 to the lower dump grate 8. The grate bars are supported upon the side supporting pieces 6a which are carried at theirupper ends by the supports 6". The side supporting pleces 6a are bent horizontally at their` lowerends and are supported on the wall 6. These side supporting pieces are provided with slots 7 ainto which the pivots 7 of the bars are received. The dump grate 8 is pivotally supported upon the pivots 9 carried by the side supporting pieces 6, and is provided with some suitable means for dumping it, as for example, the operating pieces 10 which extend up to the front of thedoor and are provided with handle pieces 11 and notches 12, said notches adapted to engage the holding piece 13 so that the grate mayf be held in any desired position.` The grate bars 6 are provided with some suitable means for moving them about their pivotal points. As herein shown, each grate bar is provlded with a projection 14. rlhese projections are pivotally connected with a controlling bar 15 which extends along beneath the grate` bars. This bar may be controlled by hand as shown in Fig. 5 by means of reciprocating part 16' is connected with-the bar 15 and to an eccentricl on a shaft 18. This shaftA 18 passes along the front. of the the pivoted lever 15a. I prefer, however, to

boiler and is provided with a ratchet wheel v 19 (see Figs. 1 and 3)'.V Mounted upon the shaft 18 yis an arm 20 carrying an operating pawl 21l which engages the teeth of the ratchet wheel 19 when the arm is moved in one direction so as to rotate the shaft 18. This pawl becomes disengaged from the teeth when the arm is moved in an opposite direction. The arm 20 is connected by a rod 22 with an arm 234 on a shaft 24. The Shaft 24 is a rock shaft and is actuated in any desired manner. As shown in Figs. 1 and 2, this shaft 24 is rocked by means of an arm 25 fastened thereto which arm is engaged by a rod 26 connected with an eccentric 27 on a rotating shaft 28 which may be rotated in any desired manner as by means of va motor 29 operatively connected thereto by gears 30. It will be seen that is connected with the shaft 24, said armvbeing connected by a rod 32 with an arm 33 mounted on a shaft 34 of the feeding wheel. rlhis arm has a pawl 35 which engages the teeth of a ratchet wheel 36 on the shaft 34. The rods 26, 22and 32 are preferably all made adjustable so that their lengths may be varied. These rods are preferably ad- Vjustably connected with the arms on the shaft 24 so that the length of the stroke may be varied. As herein shown, each ofsaid arms is provided with a slot 37 (see Figs. 2 and 3)- arranged so that the connection between the rod and the arm may be moved v along said slot to vary the length lof the arm, and hence the stroke.

Referring now to Fig. 1, it will be noted that the rod 26 is provided at its end with a holethrough which passes a bolt 38' having a head 39, the rod 26 being kept in place by the screw, the parts may be moved along` the slot 37 -and held in any desired position by again moving the handle 42 to tighten the screw. The

eccentrics

17 and 27 are -preferably made adjustable so that the stroke may be varied. The form of -..these eccentrics may be seen by referring to eccentric 27 shown in Figs. 1A and 2. In this.

' construction, the shafts 18 and 28 of the eccentrlcs are mounted in a sliding block operation of the device.

'431adapted to be slidvtoward. and from the lcenter ofthe eccentrlc so as to vary the eccentricity of said shaft. This sliding block Ais controlledv by a screw 44-which has a screw-threaded engagement with a part 45 fastened to the eccentric, the other end of c attached to thel projection46 on the. sliding block 43. It'

saidA screw being rotatabl will be seen that by rotating the screw the block may `be moved in. either direction to varylthe eccentricity and that this variation may be exceedingly small if desired thus' giving a great range of "Ii-'egulation in the The rods 16 and 25' are made adjustable so that they may be easily adjusted when the eccentricity of the eccentric is varied. IThe door -47 is located -at'the top, of tle 'grate so that the operation.

of the grate maybe seen. This door also gives vaccess to the grate and the lower end ofl the hopper and the feeding wheel. The

arch 49 may, lof course, be of any desired construction. f y l 'The use and operation of my invention are as follows: Thevdevice may be used in connection with aseries of furnaces in which event the various shafts would run the entire length of the series so that-the feeding devices can all be controlled by a single mctor or driving shaft. The coal or other fuel is placed in the hopperzl and islfed in equal orv measured quantities by 'means of the feeding wheel 5 tothe grate bars. The coal then slides along the grate `bars and is burned thereonand on the dump grate 8.

The grate bars 6 are gradually rocked about their pivotal points by means of the rod 16 and eccentric 17 on the shaft 18. This shaft regulated lindependent of the others.

is slowly and intermittently moved by the pawl 2l and the ratchet 19, said pawl being l above the front part of the bar behind it,

thus forming apocket into which the fuel is received/ As the front -bar is moved"A upwardly, the fuel is pushed out of this pocket and passes on to the next grate lbar and'is then moved down to the pocket produced by it, and thus gradually travels `along the grate. It will be seen that the speed of movement of the grate bars may be varied at will by' varying the throw of the eccentrics or either -of` them. These eccentrics may be regulated so as to vary their throw a very small amount, as for example, two one-thousandth of an inch, and hence exceedingly close regulation may be sev cured. `It will also be seen that by regulating the. eccentric 17, each grate may be this construction, very little space is requiredin front of the boilers. A' greater combustion chamber is also secured because of the construction and the inclined position of the grate. This combustion chamber may be made five or six feet at the bottom of the grate. The power required -to'operate the apparatus is particularly small and the gradual. 'feeding of the coal from pocket to pocket insures -its proper consumption and results .in a great saving of fuel. The device can Vbe easily and quickly installed or dismantled. In' view of the regulation of the feed, itwill be seen that the device is independent ofthe driving shaft or motor. By giving the eccentric a long stroke, the coal may be fed rapidly and by giving it a short stroke, it may be fed slowly. The agi'- Atation of the fuel in the hopper due to the feeding wheel prevents it from caking and permits the feeding of just the desired amount to the grate. This grate is air cooled as .the air passes through the grate between the bars and -through the slots in the bars and there are no clinkers produced.

I claini:

1. A device for feeding fuel to furnaces comprising a grate consisting, of a plurality of members each pivotally mounted contiguous-to one edge and adapted to provide a continuous inclined fuel supporting surface or a stepped supporting surface, a reciprocable member connected with all of said grate bars for moving the same alternately to said respective positions, a crank- Shaft for actuating said member, a ratchet Wheel for actuating said crank-shaft, ahopper for fuel adapted to discharge upon the upper end of said grate, a rotatable fuel lfeeding device in the discharge end of said hopper, a shaft therefor carrying a ratchet Wheel, rocking arms equipped with dogs engaging said respective ratchet Wheels, and a Walking beam connected at opposite ends With said rocking arms.

2. A device for feeding fuel to furnaces comprising a grate consisting of a plurality of members each pivotally mounted contiguous to one edge and adapted to provide a l continuous inclined fuel supporting surface or a stepped supporting surface, a reciprocahle member connected with all of said grate bars for moving the same alternately to saidrespective positions, a crank-shaft for actuating said reciprocable member, a

ratchet Wheel for actuating said crank-shaft, a hopper for fuel adapted to discharge upon the upper end of said grate, a rotatable fuel feeding device in the discharge end of said hopper, a shaft therefor carrying a ratchet Wheel, rocking arms equipped with dogs engaging said respective ratchet Wheels, a Walking beam having longitudinal slots in its opposite end portions, and pit- Inen adjustably engaged at one end in said respective slots in said Walkingbeam and operatively engaged at their other ends with y said rocking arms.

Signed atChicago, lilhnois, this 6th day of April 1912.

GTT@ WUNDRACK.

Witnesses:

lWINNrE M. LINDENAU, Danna A. WALTER.