US623284A - kudlicz - Google Patents

Description

No. 623,284. Patented Apr. l8 I899. .1. KUDLICZ. MECHANICAL FEEDER AND STCKEB FOR FURNACES.

(Application filed Aug. 26, 1898.)

4 Sheets-Sheen 1.

(No Model) No. 623,284 Patented Apr. I8, 1899. J. KUDLIBZ.

MECHANICAL FEEDER AND STOKER FOR FURNACES.

(Application filed Aug. 26, 1898.) (No Model.) 4 SheeisSheet 2.

No. 623,284. Patented Apr. 18, I899. J. KUDLIGZ. MECHANICAL FEEDER AND STOKER FDR FURNACES.

(Application 119d Aug. 26, 1898.) (No Model.) 4 Sheets-Sheet 3.

1 )5 J5 as 45 y 48, I I \I 31 I f 7 5 $86.9. 3 7206' or 2 W m %;'n

iiio my" Q Patented Apr. l8, I899. J. KUDLICZ. MECHANICAL FEEDER AND STCKEB FDR FURNACES.

(Application filed Aug. 28, 1598.)

4 Sheets8heef 4.

(No Model.)

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Ihvrrnn STATES PATENT Quince,

.IOSEF KUDLICZ, OF BUBNA, AUSTRIA-HUNGARY.

MECHANICAL FEEDER AND STOKER FOR FURNACE S.

SPECIFICATION formingpart of Letters Patent No. 623,284, dated April 18, 1899.

Application filed August 26,1898. Serial No. 689,569. KNOmodelof Bohemia and Empire of Austria-Hungary,

have invented new and useful Improvements in Mechanical Feeders and Stoker's for Furnaces, of which the following is a specifica tion.

My invention relates to that class of mechanical appliances for automatically stoking furnaces and feeding into them solid fuel in pieces, such as broken coal, by which .the fuel is gradually moved over the grate or fuel-surface toward the fire-bridge.

The invention has for its object to provide a mechanical appliance adapted to intermittently seize from a heap of fuel upon the rear end of the grate, opposite the end near the fire-bridge, the quantity of fuel required for generating in the unit of time the desired amount of heat and to push the said quantity of fuel forward -2'. e. toward the fire-bridge while at the same time the fuel already spread over and burning upon the grate is similarly displaced at the same rate and in the same direction, and the interstices between the firebars are freed from cinder-s.

According to my invention the said apparatus is formed of a harrow-shaped stoking appliance arranged below the grate and of suitable mechanism whereby the said stoking appliance is so operated that it first rises with its teeth or blades passing through the interstices between the fire-bars and penetrating into the fuel and is then moved forward toward the fire-bridge inorder to push the fuel upon the grate in the same direction and to clear the interstices between the firebars of cinders, the teeth or blades of the said stoking appliance being then lowered below the grate and the stoker returned into its rearmost position. In some cases I arrange upon the said harrow-shaped stoker a second set of teeth or blades, which are directed downward and of such a length as to touch the bottom of the ash-pit during the return movement referred to, and thereby to rake out the ashes and cinders. By preference,

however, I arrange for the purpose of removing the ashes and cinders endless chains running over chain-pulleys below the front and rear ends of the stoking and feeding organ, these chains having their links provided with projecting scrapers and their slack lower branches dragging upon the bottom of the ash-pit.

The movement of the stoking-harrow ma be a continuous oneviz., as soon as the stoking teeth or blades have reached their rearmost position they may be raised anew,pushed forward, lowered, returned, and so on. I prefer, however, to impart to the stoking organ an intermittent motioni. e., to cause it to stand still under the grate a certain time after each rapid operationas in this way the stoking teeth or blades are spared and kept cool. The pauses between the separate operations composing this intermittent movement are made controllable in order to admit of the quantity of fuel fed upon the grate in the unit of time being adapted to the nature of the fuel and required generation of heat.

It is obvious that numerous different mechanisms may be devised for imparting to the feeding and stoki ng organ the required movements; but I prefer the following one as permitting easy repair and having given good results in practice: Below every second fire-bar I arrange a longitudinal pipe, to which the stoking teeth or blades for the interstices on both sides of the fire-bar are secured in the manner of straps, and these pipes or tubes are internally supported by rollers mounted between bars the ends of which are connected with slide-blocks movable in inclined guideways. Cams on a rocking shaft suitably reciprocate the said slide-blocks in their inclined guideways, andthereby cause the said bars to rise and lower, while the tubes are moved forward and backward on the rollers supporting them by a link connecting a crank of the rocking shaft with a cross-bar to which all tubes are secured.

In order to have the rocking shaft intermittently operated for the reason explained, I provide a countershaft driving the rocking shaft and having motion imparted to it from Q a main d riving-shaft by means of belt or rope ICO ratchet mechanism by which the rope or belt is sooner or later pushed back upon the fast pulley.

In the case of wavy interstices between the fire-bars the movements of the stoking-blades within these interstices obviously must be adapted to this formi. e., take place along wavy lines. It is no matter of consideration whether the said interstices are formed by fire-bars placed side by side or cut into plates.

In some cases I compose the harrow-shaped stoking organ of several lengths linked together, so as to form a kind of endless chain which is run over suitable chain-pulleys and has its cross-bars so guided in suitable lat eral guideways that the stoking-blades per-' the grate-bars or in the slots of the fuel-surface, afterward advance along the interstices or slots, and finally descend under the grate.

The mechanisms briefly referred to in the foregoing statement are illustrated in the accompanying four sheets of drawings as applied to the furnace of an internally-fined boiler. Y

In the drawings, Figure l is a sectional side elevation of the boiler-furnace on line 1 1,Fig. 2. Fig. 2 is in its left-hand half a rear end view of the boiler-furnace and in its righthand half a cross-section of the furnace on line 2 2, Fig. 1. Figs. 3 and 4 are a sectional side elevation and rear elevation, respectively, drawn to a larger scale, of the rocking shaft and the mechanism actuated by the same for raising and lowering and horizontally advancing and-withdrawing the feeding and stoking organ, the tubular blade-carriers being shown in their lowermost and hindmost position. Fig. 5is a view similar to Fig. 5, but showing the supporting-tubes raised; and Fig. 6 is also an analogous View representing the tubes pushed forward toward the fire-bridge. Fig. 7 is a view corresponding to Fig. 4, but showing the cams inthe position they have when the tubular bladecarriers are raised and pushed forward. Fig. 8 is a cross-section of a supporting-tube, illustrating the manner in which the stoking-blades are secured to it. Fig. 9 is an end view of a tubular blade-carrier, showing how these carriers are secured to the cross-bar connecting them. Figs.l0 and 11 are a cross-section and top view, respectively, of a fire-bar used by preference in combination with the stoking and feeding appliance. Figs. 12 and 13 are a partly sectional top View and sectional elevation,respectively, of the mechanism by which the counter-shaft is alternately thrown into and out of gear. Figs. lat and 15 are a sectional side elevation and cross-section, respectively, of a boilerfurnace provided with the mechanical stoker and the chains for raking out the ashes and cinders. Fig. 16 is a top view of the front 'end of one of the tubular blade-carriers having secured to it two cinder-grubbing, teeth. Fig. 17 is a perspective view of one link of a cinder-dredgin g chain.

As may be inferred from Fig. 1, the coal gradually descends upon the grate from the hopper 49, which is always kept full. The said hopper 49 is supported by the outwardlyextended frame carrying the fire-bars 1 and resting on the two standards 53. The hopper 49 is closed at its top by two hinged doors 5O 50 and at its rear side-bya hinged door5l. Above the said door 51 a tube 52 is inserted for admitting of the fire being inspected, the said tube being closed at its outer end by a glass plate.

The shown grate is formed of fire-bars 1, having a triangular downwardlytapering cross-section and a broad cylindrically-bellied-out or vaulted fuel-surface. There are formed in these fire-bars lines 29, extending from the lateral facesviz., alternately from the right and left handone-to the top face, where they open in the shape of longitudinal slots. As the said fiues or ai r-passages 29 have downwardly-flaring sides, they operate like nozzles, through which jets of air are forced into the fuel. It will be readily understood that the adaptation to a grate of the feeding and stoking appliance referred to above is considerably facilitated if the interstices between the grate-bars are arranged considerably apart, because in this way the neces-' sary space for the parts of the stoking organ is provided for. For this reason I prefer the shown fire-bars having a broad top, and as,

on the other hand the free grate-surface wouldthereby be reduced, I form in these gratebars the described air-passages 20. My invention, however, is not limited to fire-bars of the shown form, as any other suitable elements may be used for building up the fuelsurface. Also the hopperet?) referred to is no essential part of a furnace adapted to be combined with my mechanical feeding and stoking appliance, but may be replaced by any known feeder which keeps a heap of fuel upon the rear end of. the grate.

Between the fire-bridge 15 and the crossbar 1*, supporting the front ends of the firebars 1, a free space 16 is left. This space 16 is intended to receive the slags and cinders which the feeding and stoking appliance gradually pushes over the front end of the grate, and during the operation of the furnace the said space 16 is always kept filled with slags and cinders in order to prevent the cold air entering the ash-pit below the grate from flowing into the lines of the furnace.

Below each second firebar 1 is arranged a tubular carrier 2 for the feeding and stoking blades or teeth 5. As clearly shown in Fig. 8, the two blades or teeth 5 5, corresponding to the interstices on both sides of the fire-bar below which the tubular carrier 2 is arranged, form a strap-shaped or yoke-shaped piece held in position by a screw-bolt 8 and staysleeve 4.

Each tubular carrier'2 is internally supported by rollers 6, journaled between two parallel bars 7, which have their front ends, near the fire-bridge, bent upward in an inclined position and guided between rollers 8 and 9,n1ounted between the cheeks 57, formed on the under side of the front cross-bar 1* of the frame supporting the lire-bars 1. The rear ends of the said bars 7 are connected with each other by means of a cross-bar 10,

bolted to them by means of screw-bolt 7* and rigidly connected to slide-blocks 12, adapted to slide in the inclined guideways 11, formed on the grate-supporting frame outside the standards 53.

The tubular blade-carriers 2 have,by means of straps fat and nuts screwed on the screwthreaded ends of the straps, their rear ends connected to a cross-bar 13, whereby all tubes 2, with their stoking-blades 5, are made up into a barrow-shaped organ adapted to be raised and lowered and moved forward and backward in-one piece.

By unscrewing the nut of the screw-bolt 7*, connecting a pair of roller-carriers 7 with the cross-bar 10, possibility is afforded for drawing the said roller-carriers out from the corresponding tube 2. After also unscrewing the nuts of the strap 14 of the said tube 2 the same may be easily withdrawn for repairing or replacing it. I

Below the hopper 49 a shaft 18 rests in suitable bearings formed in the standards 53. This shaft 18 carries a crank-disk 18*, the crank-pin of which is connected by the con necting-rod 19 to the crank-pin of the crank 3O on a counter-shaft 30. lVhen the said counter-shaft is rotated, it oscillates the shaft 18 the angle comprised between the lines I and II, Fig. 1, and this rocking movement has for its effect one complete operation of the feeding and stoking organ. It is obvious that the shaft 18, instead of being oscillated by mechanical power, may be oscillated by hand by means of a crank and suitable stops. The double cams 21, mounted to the ends of the shaft 18, have for their office to reciprocate the slide-blocks 12 in their guideways 11 in order to raise and lower the roller-carriers 7. Referring to Figs. 3 and 4C, a cam-surface 20 of the right-hand disk 23 first carries along the axially-movable cross-pin 22 of the slidebloek 12, and thereby causes this latter to risein the guideway 11 and thereby to raise the feeding and stoking blades 5, which then project between the lire-bars 1 in the positions illustrated by Figs. 1 and 2. In this raised position (shown in Fig. 5) the slide-block 12 remains as long as the cam-surface 24, concentric to the shaft 18, acts on the axiallymovable cross-pin While the stoking and feeding blades or teeth are thus kept in their raised position, they are pushed forward toward the fire-bridge 15 by means of the curved link or connecting-rod 25, which has its ends jointed to the crank-disk secured to the shaft 18 and the cross-bar 13, respectively. This pushing forward of the grid formed by the tubes 2, carrying the stoking and feeding blades 5,'and by their cross-connection is illustrated by Figs. 5 and 6. v

During the forward movement of the harrow-shaped feeding and stoking organ an incline 26, formed on the disk 23 along the last portion of the cam-surface 24:,causes the crosspin 22 of the slide-block 12 to displace itselfin its seat. Consequently the said cross-pin 22 and the slide-block 12 are no longer supported by the cam-surface 2 L, and under the action of the weight of the feeding and stoking organ the slide-blocks 12 and the rollei earriers 7 drop down again along the guideways 11 into the position of these parts shown in Fig. 3,

whereby the feeding and stoking blades 5 are lowered belowthe surface ofthe grate. As, however, it is desirable to impart to the slideblocks 12 a positive downward movement, there is provided by the side of each cam-disk 23 a second cam-disk 23*, the cam-surface 27 of which engages the cross-pin 22 on its being axially displaced by the incline 26 of the disk 23, and as soon as the rocking shaft 18 makes its return oscillation the said cam-surface 27 carries the cross-pin 22 and slide-block 12 back into their lowermost position. end of the cam-surface 27 there is an incline 28, by which the cross-pin 22 is again moved axiallyin its seat, but in the opposite direction, as before, and thereby is brought into engagement with the cam-surface 20 of disk 23, as shown in Figs. 3 and 4. As already stated, the rocking movement may be imparted to the shaft 18 by hand with the aid of a suitable crank and stops. WVhen the shaft 18 is to be operated by mechanical power, the operation must be an adjustablyintermittent one, as the rate of feed must be adapted to the nature of the fuel and to the amount of heat to be produced in the unit of time. \Vith this in view I provide a counfer-shaft 30, already referred to, which is adapted to rock the shaft 18 by means of the crank 30*, connecting-rod 19, and crank-pulley 18*, and to which an intermittentrotary movement with controllable intervals is imparted from the main driving-shaft through the following instrumentalities:

Referring to Figs. 11 and 12, the countershaft 30 carries a fastrope or belt pulley 31 and a loose one 32. By means of the worm 33, mounted to the counter-shaft 30, and the worm-wheel 34, secured to the vertical shaft 35, this shaft is rotated. The said vertical shaft 35 carries a disk 56, on the under side of which is formed a tappet 37, this tappet having for its office to carry along, after each full revolution of the shaft 35, a pin or arm 88, secured to the engaging and disengaging rod 39, adapted to slide in bearings 39* and 39*. Every time the tappet 37 pushes the arm 38 and the disengaging-rod 39 from the position shown in dots into the position shown in full lines the fork t0 shifts the rope to the loose pulley 32, whereby the shafts 30, 35, and 18 are stopped. The loose pulley 32, which is now rotated, has made integral or secured At the inner to it a cam a1, which at each revolution 'of the said loose pulley impinges on an angular lever 42, loosely mounted to a horizontal shaft #13, which is arranged above the counter-shaft and parallel to the same. The said lever 42 carries a friction-pawl 44, engaging the groove of the disk 45, and thereby intermittently rotating agiven angle the said disk and its shaft 4C3, to which is secured another disk 46, with a cam 47 formed on one face. By the said cam 47 the two-armed lever 54:, one end of which engages a slot of the disengaging-rod 39, is so displaced as to throw the counter-shaft 30 into gear again. By the adjusting-screw 48 hearing against the depending end of the pawl-lever42 the position of this lever can be so regulated that the throw of the oscillations it makes under the action of the cam 47 varies from zero to a given maximum. Consequently the quantity of fuel fed upon the grate is thereby similarly regulated.

It has been stated heretofore that the space 16 between the front end of the grate and the fire-bridge 15 is kept full of ashes and cinders in order to prevent the cold air from streaming through the ash-pit into the fines of the furnace; but as the mechanical feeder and stoker continually pushes fresh ashes and cinders into the space 16 the portion sunk down into the ash-pit must gradually be removed. This may be done by rakes in the ordinary way; but I prefer to combine the mechanical feeder and stoker with a mechanical ash and cinder dredger.

Referring to Figs. 14 and 15, 54: is a shaft journaled in thestandards 53 and adapted by obvious means to be continuously rotated. On all points facing the interstices between two tubes 2 the said shaft 54 carries a chainwheel 55, and over. these chain-wheels driving-chains 56 are run between the tubes 2 to other chain-wheels which are mounted between the cheeks 57, formed on the under side of the front cross-bar 1* of the frame supporting the fire-bars 1. The said chainwheels 55* are made integral with other chainwheels 58, arranged on both sides of them and being of larger diameter, and to these chain-wheels 5S correspond chain-wheels 58*, loosely mounted to the shaft 54:. The chainwheels 58 and 58* are destined to operate the endless ash -dredging chains 59, the lower branch of which is slack, so as to be dragged over the bottom of the ash-pit. As clearly visible in Fig. 17, which is a perspective view of a link of a dredging-chain 59, the side bars of the link have downwardly-extending scrapers 60 formed on them, these scrapers being destined to push the ashes and cinders toward the rear end of the ash-pit. In order to have the ashes and cinders regularly fed under the dredging-chains 59, there are grubbing-teeth 61 secured to the front ends of the tubes 2, as shown in Figs. 14. and 16-. hen the tubes 2, pushed into their foremost posi- Goal which by means of the described stok- 1 ing and feeding organ and driving mechanism is carried over the grate from the hopper toward the fire-bridge with a velocity chosen according to its nature is upon the rear portion of the grate gradually deprived of its volatile constituen ts-z'. 6., cokedand the cokes thus formed are burned on the front portion of the grate with surplus air, as the interstices between the fire-bars are always kept completely free.

The gaseous hydrocarbons evolved by the coal upon the rear end of the grate are obliged to pass through the incandescent oxygenous gases rising from the front end of the grate and are thereby subjected to complete combustion. As the fire-chamber always remains closed, no interruption of the combustion by an inrush of cold air can take place.

What I claim, and desire to secure by Letters Patent of the United States, is

1. In a mechanical feeder and stoker for furnaces, the combination with the grate of means for keeping upon the rear end of the same a heap 'of fuel, a grid arranged below the grate and provided with teeth adapted to penetrate into the interstices between the firebars, as well as with means for raking back on its return stroke the cinders which have fallen from the grate, and suitable mechanism for so moving the said toothed grid, that it first rises so that the teeth penetrate into the layer of fuel upon the grate, afterward moves forward along the grate a' certain distance, and finally lowers and returns into its rearmost position, substantially as described.

2. In a mechanical feeder and stoker for furnaces, the combination with the grate of a grid arranged below the grate and provided with teeth adapted to penetrate into the interstices between the fire-bars, as well as means for drawing back the fallen cinders on the return stroke, and suitable mechanism for intermittently so operating the said toothed grid, that it first rises with its teeth projecting through the interstices between the firebars, afterward moves forward along the grate a certain distance, and finally lowers and returns into it's rearmost position, substantially as described.

3. In a mechanical feeder and stoker for furnaces, the combination with the grate of means for keeping upon the rear end of the same a heap of fuel, a grid arranged below the grate and provided with teeth adapted to penetrate into the interstices between the fire-bars, automatic mechanism for intermittently so operating the said toothed grid so that it moves upward, forward, downward and back again, and means for adjustably controlling the intervals between the operations of the said mechanism, substantially as described.

4. In combination with a grate, a grid provided with teeth or projections adapted to extend up through the said grate for feeding fuel along the same and also with downwardly-projecting parts at its inner end, an endless chain provided with scrapers for re? moving the fallen cinders, mechanism for driving the said endless chain and mechanism for longitudinally reciprocating and lifting and lowering the said grid whereby the fuel is fed forward, and on the return stroke the said downwardly-extending parts are made to drag the cinders within reach of the said end less chain, substantially as set forth.

5. In combination with a grate and a firebridge having a space 16 between them, which is adapted to be filled with cinders and ashes for the exclusion of air, a reciprocating device adapted to feed fuel alongt-he said grate and provided with means for drawing back cinders from below the said space, an endless chain adapted to receive and remove the cinders, and mechanism for actuating the said endless chain and feeding device,'substantially as set forth.

0. In combination with a grate, a grid consisting of tubes provided with teeth extending up through said grate, independentlymovable supporting-rods within the said tubes, connections for said tubes and said rods respectively, mechanism for reciprocating the said tubes longitudinally, and mechanism for raising and lowering the said rods in order that these motions may be transferred to the said teeth, and the grate may 'be raked by the compound reciprocating movement thus produced, substantially as set forth.

7. In a mechanical feeder and stoker for furnaces, the combination with the grate of means for keeping a heap of fuel upon the rear end of the same, a pair of bars, between which rollers are pivoted, arranged under every second fire-bar, parallelly to the same, tubes passed over the said roller-carriers so as to rest on the rollers, upwardly-extending teeth or blades secured to both lateral sides of the tubes so as to be placed below the interstices between the grate'bars, mechanism for raising and lowering the roller-carriers, and mechanism for reciprocating the tubes along the roller-carriers, substantially as and for the purpose described.

8. In a mechanical feeder and Stoker for furnaces, the combination with the tubular .stoking-blade carriers and the roller-carriers,

passed through and supporting them, of a cross connection of the rear ends of the tubular blade-carriers, a cross connection of the rear ends of the roller-carriers, inclined guideways arranged near the front ends of the roller-carriers and near the ends of their cross-bar, slide-blocks connected with the cross-bar and adapted to slide in the inclined guideways, and mechanism adapted so to reciprocate the said blocks in the guideways that they remain stationary a given time in their highest and lowest positions, substantially as and for the purpose described.

9. In a mechanical feeder and stoker for furnaces, the combination with the tubular stoking-blade carriers and the rollers and roller-carriers supporting them, of cross connections for the rear ends of the blade-carriers and roller-carriers, inclined guideways for the correspon'dingly-bent front ends of the roller-carriers, inclined guideways near the ends of the cross-bar of the roller-carriers, slide-blocks movable in the said guideways and rigidly connected with the ends of the said cross-bar, a shaft carrying cams, transmitting connections between the slideblocks and cams, and means for operating the cam-shaft, substantially and for the purpose described.

lO. In a mechanical feeder and stoker for furnaces, the combination with the tubular stokingblade carriers and the rollers and roller-carriers supporting them, of cross connections for the rear-ends of the blade-carriers and roller-carriers, inclined guideways for the correspondingly-bent front ends of the roller-carriers,inclined guideways near the ends of the cross-bar connecting the rollercarriers, slide-blocks movable in the said guideways and connected with the ends of the said cross-bar, a crank-shaft carrying cams, transmitting connections between the slideblocl s and cams, a link connecting the crank-pin of the crank-shaft to the cross connection of the tubular stoking-blade carriers, and means for operating the cranked cam-shaft, substantially as and for the purpose described.

11. In a mechanical feeder and stoker for furnaces, the combination with a slide-block adapted to slide in guideway of a rocking shaft, two cam-disks mounted to the shaft, and a cross-pin axially movable in the end of the slide-block which projects between the cam-disks, each cam-disk having an eccentric surface for displacing the slide-blocks by means of its cross-pin, a concentric surface for allowing it to remain stationary, and an incline for shifting the cross-pin into engagement with the other cam-disk, substantially as described.

12. In a mechanical feeder and stoker for furnaces, the combination with the shaft adapted to actuate the mechanical feeder and stoker and the main driving-shaft of a counter-shaft, belt or rope driving-gear connecting the main d riving-shaft with the countershaft, rocking gear connecting the countershaft with the shaft actuating the mechanical feeder and stoker, engaging and disengaging gear for the said driving belt or rope, and a revoluble tappet in transmitting connection with the counter-shaft and adapted so to operate the disengaging-gear as to throw the counter-shaft out of gear after a given IIO time, substantially as described and for the purpose specified.

13. In a mechanical feeder and stoker for furnaces, the combination with the shaft adapted to operate the mechanical feeder and stoker and the main driving-shaft of a counter-shaft, belt or rope driving-gear connecting the main driving-shaft with the countershaft and comprisinga fast and a loose pulley, rocking gear connecting the counter-shaft with the shaft adapted to operate the mechanical feeder and stoker, engaging and disengaging gear for the said driving belt or rope, a revoluble tappet in transmitting connection with the counter-shaft and-adapted so to 0p erate the disengaging-gear as to shift the belt or rope from the'fast pulley to the loose one, and mechanism geared with the loose pulley and adapted to operate the engaging and disengaging gear in the opposite sense, substantially as and for the purpose described.

14. In a mechanical feeder and stoker for furnaces, the combination with the main driving-shaft and a counter-shaft, adapted to operate the mechanical feeder and stoker, of

belt or rope gearing connecting the main driving-shaft with the counter-shaft and comprising a fast and a loose pulley, an appliance for shifting the belt or rope from one pulley to the other, mechanism in gear with the counter-shaft and adapted to shift the belt or rope from the fast. pulley to the loose one, a ratchet mechanism adapted to be operated by the loose pulley, and mechanism operated by the ratchet and adapted so to operate the engaging and disengaging appliance as to shift the rope or belt from the loose pulley to the fast one, substantially as and for the purpose described.

15. In a mechanical feeder and stoker for fu rnaces, the combination with the main driving-shaft and a counter-shaft, adapted to operate the mechanical feeder and stoker, of belt or rope gearing connecting the main driving-shaft with the counter-shaft, which carries a loose and a fast pulley, an engaging and disengaging appliance for shifting the belt or rope from one pulley to the other, mechanism geared with the counter-shaft and adapted so to operate the disengaging mechanism as to throw the counter-shaft out of gear, a revoluble tappet in transmitting connection with the loose pulley, a ratchet mechanism the pawl-lever of which is adapted to be operated by the said tappet, an adjustable stop for the pawl-lever, and mechanism in gear with the ratchet-shaft and adapted so to operate the engaging and disengaging appliance as to throw the counter-shaft into gear again, substantially as and for the purpose described. I

In witness whereof I have signed this specification in presence of two witnesses.

JOSEF K DLI Z.

\Vitnesses HUGO DONZELMANN, RUDOLF LANG.

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