US1136941A - Chain-grate mechanism. - Google Patents

Description

CHAIN GRATE MECHANISM. APPLICATION FILED Nov. 4. 1907.

Patented Apr. 27, 1915.

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PAUL L. CROWE, OF JERSEY CITY, NEW JERSEY, AND AARON FRANKENHEIM, OF NEW YORK, Y.; SAID FRANKENHEIM ASSIG-N OR TO SAID CROWE.

CHAIN-GRATIS MECHANISM.

Maasai.

Specification of Letters Patent.

Application led November 4, 1907. Serial No. 400,722.

Be it known that we, PAUL L. CRowE and AARON FnimKnNHniM, both citizens 0f the United States, said PAUL L. Cnown a resident of Jersey City, in the county of Hudson, State of New Jersey, and 'AARON FRANKENHEIM a, resident of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Chain-Grate Mechanism, of which the following is a specification.

This invention relates to chain grate mechanism, and the object is to provide improved means for mounting a traveling grate for conveying fuel, properly distributed, over the surface thereof through the combustion chamber of a furnace, so lthat there .will be satisfactory and continuous combustion, with a minimum amount of smoke, the fuel being coked on the forward end of the grate surface at the time of igni? tion.

A further object is to provide means for mounting the frame carrylng the grate within the furnace structure so that it may be withdrawn therefrom, and the said framel may be given a suitable inclination. and the inclination varied for regulating the size of the fuel port, andthereby controlling the thickness of the layer of fuel upon the grate, the surface of the grate and the adjoining furnace wall, at all times, forming a substantially continuous surface, with which the fuel is brought into contact.

A further object is to provide in improved form of bridge members for retarding the passage of the fuel over the lower portion of the grate in order to allow time for its complete combustion.

A further object is to provide improved means for carrying the chains supporting the grate bars, and means for connecting the said chains and grate bars.

Other objects will appear from the following description In the accompanying drawings: Figure 1 is a View of the grate mechanism in side elevation. Fig. 2 is an inverted plan view of a portion of the chain grate. Fig. 3 is a vertical transverse section through the grate Fig. 4 is a perspective view of one of the standards supporting the outer end of the frame. Fig. 5 shows the means for supporting the inner end of the frame. Fig. 6 illustrates the upper and lower side bars of the frame connected by astrut. Fig. 7 is a. vertical section through one of the sprocket wheels, showing the relation of the grate bars to such wheels. Fig. 8 is a side elevation of the sprocket wheel. Fig. 9 shows the portion of the sprocket wheel with the chain positioned thereon. Fig. 10 is a perspective view of the dumping plate at the lower end of the grate. Fig. 11 is a perspective view showing means for connecting the bridge members to the frame near the lower end of the latter. Fig. 12 is a top plan view of one of the bridge members. Fig. 13 is a side elevation thereof.

In carrying out our invention we employ a. grate frame arranged preferably at an incline, and located mainly within the furnace structure, but projecting therefrom to a. slight extent at its upper and outer end, in order to afford means for feeding fuel to the said upper end and controlling the fuel supply by the position of the grate and the resulting distance between the latter and the adjacent portion of the furnace wall and fuel hopper.

In Fig. 1 the grate frame is shown in side elevation, the portion of the furnace wall above the frame, being indicated by 10, and a-portion of the front of the furnace structure below the grate frame, heilig indicated by 15. The grate frame proper consists of upper and lower side bars, the upper bars 16 being formed of ordinary bar iron, and the lower bars 17 parallel with bars 16, consisting of angle bars of usual form. Bars 16 and 17 are connected by means of struts 18, bolted respectively to the upper and lower bars of the frame, in the manner shown in Fig. 6, and bars 16 have bolted to the outer surface thereof, angle bars 19 and 20, forming substantially a channel member overlapping a ledge 2l projecting from the side wall 22 of the furnace. bars 16 are connected near their lower ends by an angle bar 23 affixed to the angle bars 19 in the manner shown more clearly in Fig. 11, and mounted upon the angle bars are bridge members hereinafter described. The grate frame is carried indirectly upon standards at its upper and lower ends. At the upper end a plurality of standards 24 support a transverse shaft 25. carrying a hub 26, upon which the side bars 16 of the grate frame are supported. These side bars are cut away at 27 as shown in Fig. 1, in order Patented Apr. 27, 1915.

Upper side los y nection as above explained. A dumpingplate 32 is connected at 33 to the lower end of the frame, and a connecting member 34 secured to the lower side of the dumping plate 32, is pivotally connected at 35 with bar 36 extending the full length of the grate frame, and supported at 37 upon a projection formed on standard 24.

Idlers 38 are carried upon hollow shafts 39 located between side bars 16, and are designed to support the chains 40, which carry the grate bars 41. The hollow shafts 39 are connected to sidebars 17 by means of pins 42, and the said pins are secured by cotter pins 43. Idlers 44 are carried bythe lower side bars 17 of the frame, and are mounted upon pins 45 secured by bolt 46 to side bars 1 cotter pins 47 holding the idlers last mentioned in position. These idlers 44 support the grate bars on'the lower run of the traveling grate. i

The bridge member is connected with the angle bar 23 secured to the lower portion ofthe grate frame, and extending transversely thereof, such bridge member consisting of a plurality of bridge bars 50 formedv in the manner shown in Figs. 12 and 13. lThe said bridge bars are curved on their Vupper surface and afford no obstruction to the passage of the fuel thereover, other than the obstruction due to the elevation of the said bars above'the upper surface of the grate. Slots 51 formed in the lower side of the bars correspond in configuration to the transverse section of angle bar 23 and afford means for interlocking the bridge bars with the angle bar. The bridge bars 50 are merely connected with'the bar 23' by passing the slotted portion over one end of bar 23, suflicient space for the purpose being provided. The bars 50 also interlock at the ends farthest removed from angle bar 23, in order to prevent movement in a vertical direction at that end and also to prevent movement of one bridge bar independently of the adjoining bar. This result l.is effected by providing a recess 52 on one side of each bridge bar and a projection 53, on the opposite side for engaging the corresponding recess in an adjoining bar.

The fuel in passing downwardly over the surface of the grate will be somewhat retarded by the bridge member and any fuel which has not been completely consumed, will be consumed at this point, so that only the refuse will pass over the bridge member to the dumping plate 32. In order to vary the amount of fuel Afed to the upper end of the grate, the standards 24 are adjustable in two directions. A threaded member 54 is connected with the lower end of each of the standards and is arranged to engage one of the apertures 55 in the plate 56. The upper end of the standard 24 is provided with a `set screw 57 arranged to bear against a A portion of the front wall of the furnace, and it will be apparent that by adjusting screw 57 the inclination of the standards 24 may be varied, thereby increasing the tension on the chains and taking up any of the slack therein. This construction produces a slightly uneven surface of the grate from time to time, which is desirable in the proper distribution of the fuel. If the chains become unduly slack through wear, the lower end of the standard may be inserted in an aperture 55 farther from the wall of the furnace. The chains 40 carried upon idlers 38 and upon sprocket wheels 60, carry the grate bars 41 as above stated, and we regard as important the manner of connecting the grate bars and chains.

In the drawings several forms of connection are shown. In Fig. 3, one end of the grate bar is provided with a pinI 61 extending horizontally therefrom and with a pin 62 extending vertically through the grate bar, both pins projecting in the plane of the web of the bar, which web is cut away at each end in order to provide suitable connection between the grate bars, chains and supporting device. The chains are so arranged as shown in Fig. 3, that a horizontally disposed link will be opposite a vertlcally disposed link, and the horizontal and vertical pins along one side of the series of grate bars therefore alternate. In inserting the grate bars in the chains, the horizontal pins 61 are thrusted laterally into the'vertical links 63, and the pin 62 at the opposite end is allowed to drop into the horizontal link 64 where it is secured by means of pin 65. v

The subject-matter of the chain and bar connections is claimed in substance in subsequent applications filed March 9, 1914, Serial Number 823,388 (patented November 3, 1i914, No. 1,115,904), and November 21, 1914, Serial Number 873,272.

In order to protect the grate mechanism from undue heat, we have provided, as previously described, means for collecting ashes between the sides of the traveling grate, and the furnace structure. The overlapping angle bars 19 and 20 and the ledge 21 connected with the side wall of the ful;- nace, afford, therefore, a substantially continuous support with which the fuel is i-,iaenai brought into contact, there being no space -at the sides for allowing fuel to drop beprovided with-a flanged member 80 extending therefrom and having teeth 81 for en- .gaging the links of the chain. These teeth have curved cut away portions '82- on their inner sides corresponding to the form of the links. A groove 83 adjoins the flanged porr tion 80 and is provi ded with flat surfaces as shown in Fig. 9 at 84, for receiving the ila-t side of the vertical links. The horizontal linkrests partly upon the portion 85 on the side of the groove opposite to the portion 80, and adjacent to portion 85 is a series of. teeth 86 arranged to engage the end portions of the grate bars. A conical portion 87 adjoins the series of teeth 86 and supports the portion of the grate bar shown at 88 in Fig. 7 -1 The sprocket wheels, formed as described, support and drive the chains and the connected grate bars in a most eiiicient manner, and theyalso provide for the removal of individual-grate bars at the outer end of the grate frame by withdrawing pins 89 through the cut away portions 90 between the teeth 81, of portion 80. It is thus possible to detach individual Grate bars from any portion of the traveling grate for the purpose of renewing the same from time to `time. The grate bars have lateral projections 91 at their central portions, oppositely arranged as shown in Fig. 2, so that endwise thrust of the bars is prevented. Perforations 92 in the bars 41 afford air space.

The subject matter of the sprocket wheel is claimed in detail in application filed under date of March 9, 1914, Serial No. 823,387.

By forming the grate bars in the manner shown in Fig. 1, with the flange at one side of the web, the bars will not be caught by the bridge bars. It is obvious that the portion ofthe grate bar first passing under the bridge is at a less distance from the pivotal portion of the grate bar than the outer edge of the flange. Were the flange to, extend on both sides of the web, the edge first passing under the bridge would be elevated sufliciently to come into contact with the bridge.

Having now described our invention, what we claim as new and desire to secure by Letters Patent is- 1. In a device of the class described, a furnace structure formed with a ledge projecting inwardly from the surface of the wall thereof, a supporting frame arranged therein, the sides of the frame abutting such ledge, whereby the frame is spaced from the wall of the structure, means for pivotally mounting one end of the frame, standards mounted adjacent the opposite end of the frame, grate supporting devices carried by the frame and by said standards, bars carried by the sides of the frame and overlapping the ledge, and a traveling grate carried by the grate supporting devices, the surface -of such grate being disposed above the surface of the ledge providing an open ash receptacle above such ledge and alongside the grate.

2. In a device of the class described, a furnace structure having a ledge projecting inwardly from the surface of the wall thereof, a frame mounted within the structure, and abutting the edge of the ledge, a grate supported within the frame, the surface of the grate being disposed above the upper surface of the ledge whereby an open ash receptacle is formed above such ledge, and alongside the grate', bars carried by the sides of the frame and overlapping said ledge, an angle bar extending transversely of the frame and connected with opposite sides thereof, said angle bar being secured to the bars overlapping the ledge.

3. In a device of the class described, a supporting frame, means for pivotally mounting one end of the frame within a furnace structure, standards vertically and laterally adjustably mounted adjacent the opposite end of the frame and without the furnace structure, a transverse horizontal shaft carried by the standards and supported independently of the frame, a hub for said shaft, portions of one end of the frame being arranged to rest on said hub, sprocket wheels carried by the shaft, plate supporting devices mounted in the opposite end of the frame, a traveling grate arranged to have motion imparted thereto by said shaft and sprocket wheels, hollow shafts mounted be tween the members of the frame, idler wheels carried at the ends of the hollow shafts for supporting the traveling grate at points intermediate of the ends, and means whereby either' wheel of each shaft may be detached independently of the other, said means including pins projecting into the ends of the hollow shafts and secured to the latter and to the frame.

4. In a device of the class described, a supporting frame, means for pivotally mounting one end of the frame within a furnace structure, standards vertically and laterally adjustably mounted adjacent the opposite end `of the frame and without the furnace structure, a transverse horizontal shaft carried by the standard-s, and supported independently of the frame, a hub for said shaft, portions of one end of the frame bein arranged to rest on said hub, sprocket w eels carried by the shaft, grate supporting devices mounted in the opposite end of the frame, and a traveling grate arranged to have motion imparted thereto by said shaft and sprocket Wheels, an engaging device on one of the standards, a dumping member mounted at one end of the traveling grate, a rod connected with such member and arranged to be held against displacement by such engaging device, an angle bar extending transversely of the grate adjacent to the dumping member, and a plurality of bridge members slidable transversely thereof, and rigidlyy secured against movement at an angle to such transverse movement.

5. In a vdevice of the class described, a frame, a. traveling grate mounted therein, a bridge extending transversely of the grate near one end thereof, said bridge consisting of a plurality of bars the upper edges of which extend in a continuous curve whereby the movement of the material thereover is rendered uniform, said bars each provided with an L-shaped slot, and a laterally projecting lug arranged to engage a corresponding aperture in an adjoining bar, and an angle bar arranged transversely of the frame, such L-shaped slots in the bridge bars engaging the angle bar.

6. In a device of the class described, a furnace structure, a frame mounted therein, said frame comprising upper side bars, angle bars connected therewith, lower side bars, and devices connecting the upper and lower bars, a ledge formed on the wall of the structure and projecting from the inner surface thereof, the sides of the frame abutting the ledge, and a grate mounted within the frame, the surface of the grate being disposed above the surface of the ledge, whereby an open ash channel is formed above such .ledge and alongside the grate.

7. In a device of the class described, a frame, a plurality of endless chains mounted therein, a series of grate bars connected with the chains, and sprocket wheels for driving the chains, said sprocket wheels each comprising a body portion provided with a groove having a series of flattened faces for engaging the straight'portions of alternate links, va series of teeth with cutaway portions on their inner edges adjoining said groove, means on the opposite side of the groove for receiving the fiat sides of links alternating with the links first mentioned, grate bar engaging devices projecting from the body portion in a plane parallel with the teeth, and chain engaging devices on the grate bars, said sprocket wheels being provided with recesses through which the chain engaging devices may be removed.

8. In a device of the class described, a frame, means for mounting a lurality of endless chains therein, a series of grate bars, pinssecured to the ends of each of the gratebars for engaging the links of the chains, one of the pins on each bar projecting downwardly and the other projecting longitudinally in the plane of the web of the bar, and lugs projecting laterally from a thickened portion of the web of each of the grate bars and arranged to engage correspondingly formed lugs on the adjacent bars, the said lugs being reversely arranged and preventing endwise movement of the grate bars in one direction, the downwardly extending pins preventing such movement in the opposite direction.

9. In a device of the class described, a furnace structure, a frame mounted therein, said frame comprising upper side bars, angle bars connected therewith, lower side bars, and devices connecting the upper and lower bars, a ledge formed on the wall structure and projecting from the inner surface thereof between the angle bars, the sides of the frame being adjacent to the ledge and spaced from the wall to permit radiation of heat, and a grate within the frame, means for mounting the grate in the frame, the grate surface being independent of said frame, being disposed above the ledge, and forming an open channel above the ledge and at the side of the grate.

Signed at New York in the county of New York and State of New York this 31st day of October A. D. 1907.

PAUL L. CROWE. AARON FRANKENHEIM.

Witnesses:

FRANK J. DUFFY, O. BARRITT.

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