US1312397A - Automatic stoker - Google Patents

Description

5,1.. HARTJ 'AUTQMAUOSTOKEH. z i AAPPLICATION FILED MAY 26. i917.

` Patented Aug. 5,1919;-

4 SHEETS-SHEET 1 :rE-@Em :2:21:

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Edwin j Huf/LTI;

E. 1. HART.

AUTOMATIC STOKER.

APPLICATION FILED MAY 26.191?.

m6111811 Aug. 5, 1919;

4' SHEETS-SHEET 2.

5.1. HMH.. AUTOMATIC soKER. 'APPLICATION FILED MAY 26. 1917'.

Patented Aug. 5, 1919.

4 SHEETS-SHEET 3.

5.1. HART.'

AUTOMATIC STOKER.

APPLlCATlON FILED ram/26,1911.

Patented Aug. 5, 1919.

4 SHEETS -SHEET 4.

' tion.

EDWIN J. HART, OF PlIILADLPHIA, PENNSYLVANIA.

4nuronrn'rro sToKER..

I' Specnca-tion of Letters Patent.

i Patented aug.. 5, raie.

applicati@ med mi 26.1917. serial Natures?.

To4 all whom z't may concern: l

Be it known that .1', EDWIN J. HART, a

citizen of the United States, residing -a-t' Philadelphia,'in the county of Philadelphia I* and State of Pennsylvania,fhave invented certain new and useful Improvements in 1 lAutomatic Stokers, of which the following is a specification.

My invention consists of an improved au tomatic Stoker. One object of my invention is't'o provide a Stoker including a fuel-injecting pusher, means for raising the injected fuel to the grate bars, and means for actu-.

ating the grate bars, and to operate all of said elements .directly from a reciprocable cross head.

Another object is to lso make the connection of said elements to said cross head that they will be of simple construction and can be quickly. and easily attached and detached.

A further object isto provide improved meansfor varying" the amount of movement of the' grate bars. l

A still further object is to provide an improved construction and arrangement of fuel injecting passage and receiving trough .whereby thejamming of the fuel is prevented and an even movement of the fuel iS insured.

-These objects, and other .advantageous ends which will bedescribed hereinafter, I attain in -the following manner, reference being had to the accompanying drawings' in which- Figure 1 shows a sectional elevation of 1 my improved Stoker, said Section being taken Fig. 2 is a transverse Section of my improved Stoker taken on the line 2452 of' Fig. 1.

Fig. 3 is an enlarged transverse Section taken on the line 3-8 of Fig. 1 and showing my improved cross head and certain of the elements which are actuated directly-therefrom.

Fim 4 is a fragmentarv sectional plan viewttaken on the line 4-4 of Fig. 3.-

Fig. 5 is a top plan view of my improved cross head.

Fig. Gis a front elevation of Fig. 5. p Fig. 7 is an end elevation of the cross head. i

cam arm which forms a part of my vinven- 'pusher 9 under the hopper Fig. 8 is a top plan view of an adjustable Fig. 9 is a section on the line 9-9 of Fig. 8. l .Y i

Fig. 10 is a fragmentary perspective view Showing a modification of certain of theele ments ofI my invention.'

Referring to the drawings, 1 represents the wall of a furnace having a casing 2 set therein, said casing having a sleeve portion B which fits'an opening within the wall 1 and flared Fig. l.

This casing 2 provides a fuelinjecting passage 4 which has a hopper 5 leading thereto. The casing 2adjacent the inner surface ofthe wall l, has a depending portion 6 which forms a drop from the fuell injecting passage4 to a trough 7 'which extends longitudinally 'through the furnace. This trough has its sides flared upwardly as clearly shown in Fig. 2 and each Side terminates in a flange 8 at the top thereof.

A fuel injecting pusher 9 is designed to slide upon the bottom Surface vl() of the pase linwardly as clearly shown in -sage 4 and is Secured to aplate 11, a block` .12 being interposed between the plate 11 and said pusher, it being noted'that the end 13 of the bottom of said passage 4 terminates forward of the block 12 which permits a sliding movement of Said fuel injecting 5 to push fuel` which is fed therethrough -into the inner portion of the passage 4 and eventually into the'trough 7 in a manner hereinafter morefully described.

-T he plate l11 has aV depending fork 14` which has prongs spaced apart toembrace x the outer end of arod 15 which isslidably movable through a hole 16 inthe depending portion 6 of the casing 2. The rod 15 moves Vlongitudinally within the trough 7 and has 95 secured theretofuel raising members 17 onlyA one of which is illustrated in the drawing,

lbut it will be understood that thenumber of these members 17 will vary' in proportion to the length of the furnace and may be spaced apart at desirable intervals.

A cross head 18 has an upwardly projecting fork 19, the prongs of said fork being'y designed to embrace the outer end of the rod 15, together with the fork 14 on the plate '11. Nuts 20 and .21 on the rod 15 are designed to engage the forks 14 `and 19 respectively. Guide bars 22 and 23 are mounted in sui-table bearingssupported by thepasing 2, and on ythese guide bars slide the'cross i head 18, it being noted that. said cross head -ihas lugs 23,a and 24rthroughwhich said guide -anadjusting rod 34 which has two worms 35 and 36' secured thereto. 'llhe worm 35 is lo,n

cated between the bifurcations of the arrn32 arm 41.

Each cam arm 41 has a-segmentA 42 ing andthe worm l36 is located between the bif4 furcations ,of the arm 33.

'A hand lever 37 is secured to said rod 34 so that the latter Vcan be rotated for a purf pose hereinafter described. Pivot holes 38 and 39 are formed in the opposite ends' of the cross head 18,l and through each of these pivot holes extends a pivot pin 40 which depends from an vmijustable `cam or cam i cluding a row of teethf'43 designed toen- `gage with a respective worin'35 or36 as clearly show ni-n Fig. 4, itbeingnoted that the teeth 43 are arranged in an arc concentric'with the pivotalaxes' of the pivot pins so'that by rotation of the worms 35 and 36, the cam arms 41 will be swungA on their pivot 'pins 4() lin opposite directions. y i' It will be [noted: that the pitch of the.;v `worms 35 and 36extene'li'n opposite directions, so that. by rotating the rod 34, the arms 41 vwill b e silnultaneously rotated in opposite-directions.

ln Figs, l to 9 inclusive, the arms 41 have elongated vslots 44 inf which are tted bushings 45. Rocking arms 46 land 47 have their lower end portions designed to. extendwithinthe slots in the cam arms j A41. 4These rocking arms 46-and 47 arefsecured respec-v tivelyto rock- shafts 48 and 49, 'l`he rock shafts have extensions 50 designed to fit within recesses independing portions 51 on grate bars 52, so that when the 'arms 46 and 47 are rocked, thef grate bars "52 j will also be moved longitudinally to a'gitate'the fuel carried'thereby. i

llt will vbe noted that other grate bars 53 are provided which, as illustrated, alternate Vwith the grate bars 52 and thesegrate bars 53 are not movable, but on the contrary 'have lipsv `54 which entend within grooves 55 inthellanges'8 at the tops et' the trough 7.v

lilyturning the cam arms 41, through the medium of the hand lever 37 and worms 35 and 36 so that the slots are positioned at an angle' as illustrated in Fig. 4, it will be noted the cross head 16 is moved linto said compartments 76 will longitudinally of the furnace, theA arms 4 6 and 47 will be oscillated to rock the rock shafts 48 and 49 and. .thereby actuate thev grate bars 52.- Theextent of this rocking movement can be varied by changing the angular positions of the cam arms/41. -ilhis can be easily done bv`rotating the adJustin bearings 56, and 57 respectively,'thelatter being positioned at the tops of walls 58and 59.v These walls are supported upon a base 60,including 'an air -inletjpassage 61 which communicates with a space between the walls 58' and 59.` 'Openings 62 and 63are provided. vin the walls 58- and59, 'and these openings can `be closed'by doors'64 and 65.

- Each; of the doors 64 and 65 `has an arm 66 connected. thereto'and'y these arms 66 are pivotally connected to a toggle lever 67 which `-is pivotally supported on a bracket 68, A

handoperatedrd 69 ispivotally connected 'to the toggle lever 67 and extends to the outer portion of the casing 2'where it is 'providedrwith' a handle 70 sov that by movement ofthe rod' 69 longitudinally, the doors 64 and 65 will be moved on their hinges 71 into/ an open or closed position accordingto the direction of movement of said rod 69.

' 'Chambers 72 and? 73 are provided below the Ygrate bars'at the outside of said vwalls 58 and 59. Each of the grate bars 52 and 53 has apartition 74 which divides the grate.

bar in to two separate compartments ancl v7,6 (see'Fig. 2). The partitions 74 are positioned above the rock shafts 48 and 49 so that the partitions, the rock shafts, l'and the walls, serve to is'plate the chambers 72, 73, and compartments 7 5A of the ygrate bars from the compartments 7 6 Iand the spacebetween the walls 58' and 59, so .that air passing up- Wardty between the walls 58 and 59 cannot pass to the ci'nnpartments` 75 other than through. the openings 62and 63 and this amount of openlng can be regulated by the position of the doors 64' and 65,

, The portions of-.the grate bars providing the `compartments 76 are Iperforated as shown at 77, s o that all of theairpassing ass'v outwardly through the perforations 7 into the fuel as it is raised from the trough 7 onto iis the :tops -of the grate bars. The portion ot v the Vair: which passesthrough the openings 62 and ,1,63 willenter the compartments 75 A and pass outwardly through pertorations 78 in the fuel supporting tops of the grate bars whichv are shown in an inclined stepped.

form inthe accoI-npanying drawings. 1

The amount ot air passing upwardly thronghthe inlet passage-61 can be regulated by a damper 79 which has a screw-thread ed lng .80 into which fits threadedportioir of a rotatable rod '181,V said rod extending 4the outer portion ot the casing 2 and is pro- :ist

vided with a hand lever 82 whereby the rod 81 can be rotated and the damper 79 will be caused to travel across the top of the inlet passage 6l to control the amount of air passing upwardly between the`Walls 58 and 59. t will vthus be understood that with my improved stoker, the cross head 18 directly controls the movement of the fuel injecting pusher 9, the fuel raising 'members 17 and rod l5, and means for actuating the grate bars. Furthermore, the construction of the several parts is such that they may be connected or disconnected from the outside of the casing.

In operation, the piston rod 27 reeipro# cates the cross head 18 and the fuel injecting pusher 9 pushes the fuel along the passage 4 and into the trough 7 vAt the same time, the rod l5 is reciprocated by the cross head 18 to agitate the fuel within the trough 7 and to raise it to the top level of the grate bars. Simultaneous with this action, the cani arms 4l lwhich are mounted on the cross head 1S are reciprocated, and bythe angular disposition of the slots 44, the rocking arms 46 and 47 effect .the movement of the grate bars.

In the form of my invention shown in Fig. 10, instead of having the lower end of the rocking lever 46 extend directly into engagement with the adjusting cam arm, Iv

provide a block 83 which slides within the slot in the cam'arm. erably made in two sections 84 which are recessed to receive the lower end of the rocking lever 46, thus insteadV of having the wear come directly on the end of the rocking lever, the block 83 will wear and can be quickly replaced from time to time.

lVhile VI have described my invention as takinga particular form, it will be understood that the various parts of my invention may be changed `without departing from the The block 83 is -pref' spirit thereof, and hence I do not limit myself to theprecise construction set forth, but'consider that'I am at liberty to make such changes and alterations as fairly come within the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is: l A i l. The combination in a stokerofia plurality of sets of grate bars; rock shafts adapted to respectively rock grate bars of each set, a cross head, adjustable cams on said cross headand adapted to oscillate the respective rock shafts due to the reciproca* tion of the cross head, said cams having rows of teeth thereon, a common adjusting rod, and worms on'said adjusting rod for respective engagement with the teeth of said cams for simultaneously adjusting said cams when the adjusting rod is actuated, substantially as described.

2. The combination in a Stoker,- of grate bars, a reciprocable cross head, a .rock shaft operative to actuate said grate bars, an arm on said rock shaft, a worm, a cam movably mounted on lsaid cross head and having worm teeth meshingwith said worin, said cam having a portion adapted to effect the movement of the arm on said rock shaft to actuate the gratos when the cross head is reciprocated, said cam being operated by the movement of said worm to change the angular position of said port-ion Vto vary the oscillating movement of said arm, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

EDWIN J. HART.' y

Witnesses:

JOSHUA R. H. Po'r'rs, CHAs. E. Po'rTs.

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