US1456418A - Furnace grate - Google Patents

Description

May 22, 1923. 1,456,418 H. BENTON FURNACE GRATE Filed Feb. 24. 1921 3 Sheets-Sheet l f Y l ATTORNEYS May 22, 1923. 4 1,456,418 H.BENTON FURNACE GRATE Filed Feb 24, 1921 3 Shet-YtS-SheI 2 Fg e 7 :l E E E E E E D :l C: E: E E

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A TTHNEYS Y May 22, 1923. 1,456,418

H. BENTON FURNAGE GRATE Filed Feb. 24. 1921 3 Sheek/-Shevet 5 (filly-'7.'

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Patented Mqay 22, 1923. s

UNITED STAFES HENRY BENTON, OF ELIZABETHPORT, NEW JERSEY.

FURNACE GRA'IE.

Application led February 24, 1921. Serial No. 447,523.

To all whom it may concern:

Be it known that I, HENRY BENTON, a citizen of the United States, and a resident of Elizabethport, in the county of Union and State of New Jersey, have invented a new and Improved Furnace Grate, of which the following is a full, clear, and exact description.

My invention is an improvement on the rate forming the subject matter of United tates Patent No. 1,131,461, granted to me March 9th, 1915.-

The general object of my present invention is to provide a grate of the type referred to improved in various particulars.

The distinctive features of the invention will be referred to in connection with a description of the structural embodiment of the invention given hereinafter and will be dened in the claims.

Reference is to be had to the accompanying drawings forming a part of this specification, it being understood that the drawings are merely illustrative of one example of the invention.

Figure 1 is a longitudinal vertical section of a grate embodying my invention showing the gra-te bars at the limit of their rocking movement imparted by a rearward movement of the rocking means.

Figure 2 is a fragmentary View similar to Figure 1 but showing the grate bars at the extreme limit of the opposite rocking movement.

Figure 8 is a view similar to Figure 2 but showlng the grate sections in the dumping position. l

Figure 4 is a transverse vertical section` Figure 5 is a fragment-ary plan view, the grids or irebed sections being omitted from the grate section at the rightof the figure to show the grate bars and the swing frames supporting same.

Figure 6 is a transverse vertical section on an enlarged scale given to show the grate bar and the supported grids or irebed sections. i

Figure 7 is a section on the line 7-7 of Figure 6.

Figure 7a is a section on the line 77a of Figure 7 given to show the means for locking` the grids to a grate bar.

' igure 8 is a perspective view of one of the cradles provided at the ends of the swing frames for carrying the grate bars.

Figure 9 is a fragmentary perspective view showing one end of the swing frame to which the cradles are secured.

Figure 10 is a perspective view of an end portion of one of the grate bars.

Figure 11 is a fragmentary side elevation 1howing an endk portion of the side frame In carrying out my invention in accord-v ance with the illustrated example, longitudinal side frame bars 15 are provided and, if the grate be made in two sections, a central frame bar 15a is employed also. The side frame bars have upstanding members or standards 16 and the central frame bar similar standards 16a,which are formed with concave seats or bearings 17 (Figure 11), to receive end trunnions 18 on the upstanding ends 19 of swinging frames or bars 20. To the ends 19 of the swing bars 20 are secured cradles 21, the ends 19 of the swing bars having lugs 22 on which the cradles rest and by which they are aligned, and bolts 23 secure the cradles on the swing bars, the bolts passing through bolt holes 19a, 21a.

In the upper edges of the cradles 21 are bearings or rests 2a for journal members 25 on the grate bars 26 which journal members, it will be noted, are inward from the ends of the grate bars for a purpose that will appear. The grate bars have rigid therewith inward of the journal members 25, shaker arms 27 which have journals 28 projecting therefrom in a direction away from the ends of the bar; that is to say, projecting laterally inward longitudinally of the grate bar. The grate bars are rocked for shaking the grate and the swing frames 2O are rocked for dumping the grate through the medium of longitudinal reach rods S3-33a, the one rod operating the front series of grate bars and the other rod operating the rear series of grate bars as is usual. The groups of the grate bars of the front grate section or assemblage are operated independently of groups of the rear grate section as is customary and as shown in my patent above mentioned ;A therefore, separate reach rods 33-33a are employed for the groups of the respective grate sections. Said rods i3- 33a are operated by levers 34 to be hereinafter further referred to, and at their inner endsare respectively connected withthe groups of grate bars of the respective grate sections as follows: It will be seen in Figure 1, there are two groups of three grate bars each in the front grateassemblage or section, and

two groups of three grate bars each in the rear assemblage.

Each group of three grate bars has the journals 23 of the shaker arms 27 pivotally engaging a link 29, the depending end 29 of each of which has a fork 29h, and a pin 32 extends transversely through said fork and through the upstanding end 35 of a longitudinal link 36 which has depending cars 37 receiving the reach rod 33 or 33, a pin or bolty 33 passing through said lugs 37 of reach rod,f completing the connection. Thus, two links 29 connect respectively with the ends of a link 36. The pin 32 passes also i through a slot 31a in an arm 31 on a plate 30,

best shown in Figure 97 which has teeth on its upper surface mating with similar teeth on the under side of cross bar 20, there being a vertical pin 39 passing through said cross bar 2O and arm 31, the arrangement serving to adjust the total eiective length of the arm 31 for a purpose that will appear. For operating a reach rod 33 or 33a, the lever 34 has a slotted bracket 34a thereon adapted to receive a pin 33b on the reach rod and said lever bar at its lower end is adapted to be fulcrumed at different points for varying the amplitude of movement of the reach rod according to whether the grate bars are to be shaken or to be dumped. Thus a bracket 40 is provided on the front B of the furnace and has a transverse pin 41 adapted to be engaged'by the fork 34b on the lower end of bar 34; also pivoted to said bracket 40 is a link 42 having at the outer end a fulcrum pin 43 with which lever bar 34 also may engage.

lVith the described arrangement, if the lever bar 34 is fulcrumed on pin 43, the reciprocating movement imparted to the reach rod 33 or 33a or said bar 34 will be such as to restrict the links 29 and 36 to an extent to ygive a shaking movement to the grate bars 26 through the medium of their shaker arms 27 and pins 28. 0n the other hand, it the lever bar 34 be fulcrumed on the pin 41, then the movement of the reach rod 33 or 33ftmay be such as to cause the pin 32 to engage the rear end of the slot 3la in arm 3l of cross bar 2O and said Cross bar willr thus be rocked on its trunnions 18 through an angle to swing the groups of kgrate bars 26 on the respective cradles 21 to the dumping positionlas indicated in Figure 3.

It will be observed that the shaker arms 27 of the grate bars 26 are inclined lat the sa'ineangle to a vertical plane, the result of which is that the links 29 pivoted to therespective groups of grate bars will have parallel movements in the shaking of the grate bars so that the said links will be disposed horizontally inthe shaking as inthe normal position of thefgrate bars. When, however, an excessive movement is given to the reaeh'rod 33' or r33t/:torl dumping the groups of grate bars, the two cross bars 2O Numeral 44 indicates lugs on the frame` bars 15 on which the cross bars 20 rest when in normal position.

back of the grate bar. indicates fixed grate bars at the front of the tirebed. To guide the grate bars 26 and prevent displacement thereof when rocking,

the cradles 21 have arcuate lugs` 47 which are accommodated in correspondinggrooves 4S in the grate bars. The orwardrocking movement ot' the grate bars is limited byv stops 49, 493' on the cradles. 1n the swingq' ing movements oi the cross bars 20, they are held against displacementby arcuate lugs 5() on the inner faces ot the sides 19, said lugs; being disposed beneath arcuate ribs 51 on the frame bars 15.

In order to prevent clinkers from wedgingbetween the walls of thet'urnace and the ends of the grate bars, I provide clinker bars Numeral 45 indicates iiller elements on the bridge wall 46 at the. The character 26a which may be formed of the upper and lower;

sections 52, 53, the latter being offset laterally inward and'securedby bolt154 or other means to frame barsl. Supporting lugs 15C are formed on-the frame plates 15 to lie beneath the clinker bar section 53. The upper sections 52 .may rest on the lower sec tions and bev readily renewable. rEhe upper edges of the clinker bars have vertical slots to minimize the-bodily expansion and contraction of said bars. i

Each grate bar 26 supports grids 56 detachably secured to the grate bars to form the lirebed. Said grids present a broad area and preterablv and advantageously the top surface thereof is rounded. Each gridw56 includes a plurality of crossing bars 57, 58. Also. each grid 56 has depending vsides 59v which are formed with vertical ,slots 60 so that the grids may be dropped vover the grate bars. The sides -59 ot' the gridsf56 constitutev standards sustaining the broad tops or grids proper at suchan elevation as to lie above the journal ends 25 of grate Ybars 26 and above thejournals. 13 ot swingable cross bars 20, to protect said ends 26 and journals 181mm the intense -heat of the fire. At the same time ample clearance is afforded below the grids and journal members `25 for the movements ot theshakingand ydumping means. On the grate barsat each sideaof the slots `60'are ribs 61 whichv are positioned against; the depending sides 59 to retain the latter. Adjacent sides 59 .of adjacent grids 56 are locked to the grate bars to prevent vertical displacement of the girds, there being employed for the purpose in the illustrated example keys 62. The said keys 62 are passed transversely through recesses 63 in the ribs 61 and through recesses 64: in the sides 59 at the slots 60 whereby the key interlocks with both the said ribs 61 and said sides 59. rl`he ends 62a of the key, when the key is in position, are bent into slots 65 in the grate bars 26. The character 611 represents ribs corresponding to rib 61 but formed on the grate bar adjacent to the ends thereof beyond the journals 25 to receive a side 15 of a grid 56.

It is to be observed that the grids 56 extend in proximity to the side walls of the ash pit, being separated therefrom only by the narrow clinker bar sections 22. Thus, the dead or fixed grate surface is minimized and practically eliminated as compared with the substantial dead grate area at the sides and center of rocking grates in use in furnaces, to which the invention pertains. The increased effective grate' area presented by the described grids is provided for by setting the side frame bars farther from the side walls which arrangement is turned to advantage instead of being made to increase the dead grat-e surface. A similar condition exists with respect to the central bar 15a, the standards 16a of which are materially separated to accommodate the projecting terminals of the grate bars. rI`he advantages of the arrangement referred to reside in an increased air circulation at the sides and center of the grate and also the arrangement permits of providing grate bars affording support for grids 56 at points on the bars near the extreme ends thereof beyond the journal members 25. An important feature also is that the trunnions of the respective grate bars 26 in addition to being located inward from the ends of the bar are offset above the axis of the body of the bar, by reason of which the grids 56 supported on said bar will have their center of rocking movement so located that said grids will turn through arcs corresponding with their own radius and be permitted clearance, as well as amplitude of movement in shaking and dumping,

Without adjacent grids clashing one with another. At the same time the result is obtained that the grids will lein close relan tion to one another when in normal position.

I would state in conclusion that while the illustrated example constitutes a practical embodiment of my invention, I do not limit myself strictly to the mechanical details herein illust-rated, since, manifestly, the same can be considerably varied without departure from the spirit of the invention as defined in the appended claims.

Having thus described my invention, I claim 1. In a furnace grate, swingably mounted cross bars, grate bars above said cross bars and arranged parallel therewith, means supporting the grate bars for rocking movement on the cross bars, reciprocating operating means pivotally connected with the grate bars for shaking the same, and members on the cross bars, said operating means having clearance in said members on the cross bars in the shaking of the grate bars and engageable with said members by an excessive movement of said operating means for dumping the grate bars; together with means to adjustably secure said members on the cross bars to regulate the clearance and engagement of the operating means with said members.

2. In a furnace grate, a supporting frame, cross bars swingably supported on said frame, grate bars-ranging parallel with the cross bars above the same, and means rockably supporting the grate bars on said cross bars, a reach rod, means connected with the grate bars for shaking the same and connected with said reach rod, said means being adapted also to engage the cross bars for swinging the same upon excessive movement of the reach rod, a lever bar for actuating said reach rod, and having means to detachably engage the latter, and means to fulcrum said lever bar at different distances from the grate for varyin the amplitude of movement imparted to tie reach rod by said lever bar.

HENRY BENTON.

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