US1999722A - Incinerator grate - Google Patents

Description

April 30, 1935. H, O, DUERR 1,999,722

INCINEIRATOR GRATE Filed Jan. 25, 1933 2 SheetsSheet 1 EHEEEEE EEEEHEE BE (Ittomeg 2 Sheets-Sheet 2 H. O. DUERR INCINERATOR GRATE 7 Filed Jan. 23, 1955 3 nventor attorney April 3U, 193

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Patented Apr. 30, 1935 UNITED STATES My invention relates to incinerator the objects of my invention are:

First, to provide a grate of this class which is in the form of a traveling grate adapted to car-. ry the trash or the like to be burned from the receiving to the discharge end of the grate, during which time combustion of the material takes place; p

Second, to provide an incinerator grate of this class wherein the several grate bars maintain their adjacent relation as they pass over the discharge end of the traveling grate whereby the ash or residue is discharged beyond the grate rather than caused to fall through the grate and interfere with its operation;

Third, to provide an incinerator grate of this class in which the operating portion thereof is maintained in a taut condition without the use of adjustable idler pulleys or the like;

Fourth, to provide an incinerator grate of the class in which the tension of the operating portion is maintained even through the length of the grates are changed by expansion or contraction due to change in temperature;

Fifth, to provide an'incinerator grate of this class wherein any one or all of the grate bars may be removed without disturbing the remaining portion of the incinerator grate;

Sixth, to provide an incinerator'grate of this class which incorporates an air supply means divided into a plurality of units so arranged that larger quantities of air are supplied to the receiving' or forward portion of the grate and the quantity of air supplied diminishes towards the discharge end of the grate commeasurate with the requirements of the material being burned, and wherein the air supplied to each unit may be regulated, and

Seventh,,to provide on the whole a novelly constructed incinerator grate which is durable yet simple of construction in proportion to its functions, eiiicient in its action, and which will not readily deteriorate or get out of order.

With these and other objects in view as will appear hereinafter, my invention consists of certain novel features of construction, combina tion and arrangement of parts and portions as willbe hereinafter described in detail and particularly set forth in the appended claims, ref erence being bad to the accompanying drawings and to the characters of reference thereon which forma part of this application, in which:

Figure 1 is a fragmentary transverse sectional view of the incinerator taken on line i--! of Fig. with my incinerator grate shown in position grates, and

8 Claims. (01. -40) and in transverse section; Fig. 2 is, an enlarged fragmentary plan view of my incinerator grate taken substantially along the line 2-2 of Fig. 1; Fig. 3 is a fragmentary sectional view thereof on line 3-3 of Fig. 2; Fig. 4 is a longitudinal sec- 5 tional view of the incinerator taken along the line 5- 3 of Fig. l with the grate structure shown in elevation; Fig. 5 is a fragmentary sectional View on line '5-5 of Fig.4 illustrating particularly the air supplying arrangement, and Fig. 6 is an enlarged sectional view of the discharge end of the incinerator grate taken in a plane parallel with the view illustrated in Fig. 4.

Similar characters of reference refer to similar parts and portions throughout the several views of the drawings.

Incinerator housing I, drive shaft 2, drive sprockets 3, idler shaft 4, idler sprockets 5,upper track members 6, return track members 1, chains 8, grate supporting bars 9, grate units It, pins H, shell plate l2, partitions l3, and air con-. trolling gates M, constitute the principal parts and portions of my novel incinerator grate structure.

The incinerator grate structure is mounted in an incinerator housing I. The incinerator housing is elongated with parallel side walls Ia connected'by a domed roof portion of any suitable structure, not shown. At their lower portions the side walls la are provided with ledges l b whichexten'd horizontally between the ends of the incinerator. At the rear or discharge end of the incinerator just below the ledges and extending between the side walls is a drive shaft 2 upon which are mounted a pair of drive sprockets 3, one mounted under each ledge and contiguous thereto. At the forward portion of the incinerator in similar relation with the ledges lb is an idler shaft 4 which carries a pair of idler sprockets 5. V

Immediately below the ledges lb and extending between the idler and drive sprockets are a pair of upper track members 6. Continuing from the under sides of the drive sprockets are forwardly and downwardly directed return track members 1; these track members terminating a considerable distance short of the idler sprockets.

A'pair of endless chains 8 are adapted to pass around the sprocket members and ride upon the upper and return track members. Each chain comprises a plurality of link members 8a connected by pins 8b which support rollers 80. The rollers to are larger in diameter than the width of the links 8a so that they rldeupon the track members and support'saidlink relative thereto. ,5

The inside links of the two chains are provided with depending and inwardly extending stirrup or bracket portions 8d.

Each opposite pair of brackets 8d support therebetween a grate supporting bar 9 which is in the form of a T-iron disposed in an inverted position with the leg extending upwardly. Each grate supporting bar is adapted to receive several grate units l0. Each grate unit includes a bifurcated leg member lfla at each end which strad-' dles the leg of the supporting bar 9 and is secured thereto by means of a pin H. Each grate unit projects above and extends along the supporting bar and forms thereabove a grid portion Nib having a plurality of slots lBc extending transversely with respect to the grate units but longitudinally with respect to its direction of travel. The several between do not increase toany material extent so that the ash is caused to pass beyond the end of the incinerator structure rather than fall between the grate units. The upward draft of air provided is therefore sufiicient to prevent any material sifting of the ash through the openings in the grate bars, as will be brought out hereinafter.

As hereinbefore stated'the return track terminates in spaced relation to the idler sprockets so that the incinerator grate structure in'passing from the end of the return track to the idler sprockets hangs in a loop, as indicated by A in Fig. 4., This loop comprises a suflicient number of sections of the incinerator grate structure to at all times provide suflicient weight in order that the operating portion, that is, the upper portion of the incinerator grate structure, is maintained under tension, thus ensuring smooth action and proper connection of the chains with the drive sprockets. As the grate becomes heated the loop A is free to expand so that the tension is maintained substantially constant at all times and at the same time eliminates any need of adjustment as the parts'become worn; 1

The diverging-relation of the upper and lower tracks towards the receiving end of the grate structure has the further advantage that air may be supplied in larger quantities to the receiving end of the grate structure as compared to the discharging portion thereof. To enhance this feature, there is provided a shell plate I2 extending between the side walls la of the incinerator housing immediately above the lower or return track members and extending from a point immediately in front of the driving sprockets along thereturn track to a point forwardly thereof where it curves upwardly so as to clear the loop portion A of the grate structure then turns up-' wardly and terminates adjacent the upper portion of the grate structure immediately back of the idler sprockets, as shown in Fig. 4. Between the ends or" the shell plate I2 there is provided a plurality of partitions !3 which join the side walls Ia and extend upwardly to contiguous relation to the operating or upper portion of the grate structure. Here the several partitions are bent horizontally forming bridging portions l3 adapted to bridge the spaces between adjacent grate units. At the sides of the incinerator housing opposite each chamber B formed by the partitions l3 and the shell plate l2 are openings [0. These openings vary in size according to the size of the corresponding chambers IB and are controlled by suitable gates I4. Byadjusting the several gates air is supplied to each unit of the grate structure in accordance with its need. That is, at the receiving end, of the incinerator, the combustion end, larger quantities of air are required. During the major portion of the combustion large quantities of air are still required; but as combustion becomes completed the quantity of air required may be reduced to a point where it is merely sufficient to prevent sifting of the ashes through the, grating and thereby prevent the light ash from being blown out the discharge end of the incinerator while still in the process of combustion. The last chamber being open towards the discharge end of the incinerator permits a portion of the air to flow out through said discharge end and thereby reduce to a minimum any sifting of the ash downwardly through the discharge portion of the incinerator grate structure.

Though I have shown and described a particular construction, combination and arrangement of parts, I do not wish to be limited to this particular construction, combination and arrangement, but desire to includein the scope of my invention the construction, combination and arrangement' substantially as set forth in the appended claims.

Having thus described my'invention, what I claim as new and desire to secure by Letters Patent is:

'1. In an incinerator grate structure, a pair of endless chains including, link members and a plurality of rollers carried thereby, driving and idler sprockets for said chains, track means for said rollers extending between the upper portions of said sprockets, track members below said track means extending from the driving sprockets towards the idler sprockets and terminating in spaced relation therewith, said chains forming free loops between said track members and said idler sprockets whereby the weight of said loops maintains under tension the portions of said chains traveling along said track means,-

and grate .units extending between and carried by said chains.

, 2. In an incinerator grate structure, a pair of endless chains including, link members and a plurality of rollers carried thereby, driving and idler sprockets for said chains, track means for said rollers extending between the upper por-' tions of said sprockets, track members below said.

track means extending from the driving sprockets towards the idler sprockets and terminating in spaced relation therewith, said chains forming free loops between said track members and said idler sprockets whereby the weight of said loops maintains under tension the portions of said chains traveling along said track means, and grate units extending between and carried by said chains, said grate bars disposed withtheir lower sides at their side edges approximately flush with the axes of the links of said chains whereby said grate bars maintain a substantially constant spaced relation with each other at their lower side edges as they pass with said chains around said sprockets.

3. In an incinerator grate structure, a pair of endless chains including, link members and a.

plurality of rollers carried thereby, driving and idler sprockets for said chains, track means for said rollers extending between the upper portions of said sprockets, track members below said track means extending from the driving sprockets towards the idler sprockets and terminating in spaced relation therewith, said chains forming free loops between said track members and said idler sprockets whereby the weight of said loops maintains under tension the portions of said chains traveling along said track means, a plurality of grate supporting bars extending between and supported from said chains in underslung relation therewith, grate units mounted on said supporting bars, said grate units disposed with their lower sides at their side edges approximately flush with the axis of the links of said chains whereby said grate units maintain a substantially constant spaced relation with each other at their lower side edges as they pass with said chains around said sprockets.

' 4. In a device of the class described, a traveling flexible endless grate structure forming an upper fuel supporting portion and a lower return portion, driving means at the discharge end of said fuel supporting portion, guide members for the upper portion of said grate structure extending the length thereof, return guides for the lower portion thereof extending partway only to the receiving end or" said fuel supporting portion, said grate structure hanging free from said return guides to said receiving end whereby the weight of said hanging portion tends to maintain tension along said fuel supporting portion.

5. In a device of the class described, a traveling flexible endless grate structure formingan upper fuel supporting portion and a lower return portion, driving means at the discharge end of said fuel supporting portion, guide members for the upper portion of said grate structure extending the length thereof, return guides for the lower portion thereof extending'partway only to the receiving end of said fuel supporting portion, said grate structure hanging free from said return guides to said receiving end whereby the weight of saidhanging portion tends to maintain tension along said fuel supporting portion, a plurality of chambers formed between the upper and lower portions of said gratestructure, said chambers being open towards the upper or fuel supporting portion of said grate structure, and gates for controlling the admission of air to said chambers.

6. In a device of the class described, a traveling flexible endless grate structure forming an upper fuel supporting portion and a lower return portion, driving means at the discharge end of said fuel supporting portion, guide members for the upper portion of said grate structure extending the length thereof, return guides for the lower portion thereof extending partway only to the receiving end of said fuel supporting portion, said grate structure hanging free from said return guides to said receiving end whereby the weight of said hanging portion tends to maintain tension along said fuel supporting portion, said return guides diverging from the guide members towards the receiving end of said fuel supporting portion, a plurality of chambers positioned between the return portion and the fuel supporting portions of said grate structure, said chambers diminishing in size from the receiving to the discharge end of said fuel supporting portion and opening towards said fuel supporting portion, and gates for controlling the admission of air to the several chambers.

7. In an incinerator grate structure, a pair of endless chains including, link members and a plurality of rollers carried thereby, driving and idler sprockets for said chains, track means for said rollers extending between the upper portions of said sprockets, track members below said track means extending from the driving sprockets towards the idler sprockets in diverging relation with said track means, said track members terminating in spaced relation with said idler sprockets, said chains forming free loops between said track members and said idler sprockets whereby the weight of said loops maintains under tension the portions of said chains traveling along said track means, grate units extending between and carried by said chains, a plurality of chambers positioned between the track members and track means, said chambers diminishing in size towards the driving sprockets and opening towards the portion of the grate units riding on said track means, and gate means for controlling the admission of air to said chambers.

8. In an incinerator grate structure, a pair of endless chains including, link members and a plurality of rollers carried thereby, driving and idler sprockets for said chains, track means for said rollers extending between the upper portions of said sprockets, track members below said track means extending from the driving sprockets towards the idler sprockets in diverging relation with said track means, said track members terminating in spaced relation with said idler sprockets, said chains forming free loops between said track members and said idler sprockets whereby the weight of said loops maintains under tension the portions of said chains traveling along said track means, a plurality of grate supporting bars extending between and supported from said chains in underslung relation therewith, grate units mounted on said supporting bars, said grate units disposed with their lower sides at their side edges approximately flush with the axis of the links Of said chains whereby said grate units maintain a substantially constant spaced relation with each other at their lower side edges as they pass with said chains around said sprockets, a plurality of chambers positioned between the track members and track'means, said chambers diminishing in size towards the portion of the grate units riding on said track means, and gate means for controlling the admission of air to said chambers.

HARRY O. DUERR.

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