US1453870A - Sifting grate - Google Patents

Description

May 1, 1923. 1, 53,870

J. W. HARTMANN SIFTING GRATE I Filed Oct. 14 1920 2 SheetQ-Sheet WWW INVENTOR.

jyflw ATTMNEYJ J. w. HARTMANN SIFTING IGRATE Filed Oct. 14, 1920 2 Sheets-Sheet 2 INVENTOR.

' ATTORNEY Patented Mayl, 1923.

u are sf JOHN ,w. HARTMAnn; or BROOKLYN, new YORK.

SIF'IING GRATE.

Application filed October 14, 1920. Serial No. 416,925.

of New York, have invented certain new and useful Improvements in Sift ng Grates,

of which the following is a specification." .The invention relates to grates for furnacesund other combustion apparatusfrom which'it is necessaryto remove accumulations of residual substances, such as ashes and clinkers,- and the object thereof is to provide means whereby'these residues may be readily separatedfrom the igneous fuel without extinguishing the fire'ormaterially retarding co-mbustiom a V a c The combustion in furnaces of all types is generally very intense when the fire is new, but as the combustion proceeds the residual incombustible earths and stones,

which are associated with the. fueLgra-dually increase invquantity and retard combustion until the attendant, with more or less difliculty, removes ,them from the combustion zone This result is usuallyattained by shaking the grate to thereby cause the ashes to; pass between the grate bars and into the ash pit of the furnace, but this shaking'op eration does not remove such masses of clinkers as are too large to pass between the grate bars, and these masses often become so great as to necessitate the dumping of the fire, and the kindlingof a fresh one. The intensity of the combustion is largely dependent upon the-strength' of the draft, and this is strongest when the fuel 1s first laid, since at that time the fuel has not been compacted,-and the interstices have not become filled with the :incombustible residues which later obstruct the draft and lessen the supply of'a-ir until the fire dies down and no longer supplies an adequate quantity of .heat. l v I The grate'which I have devised overcomes the aforesaid difficulties, provision being therein made not only for the removal of ashes and the simultaneous loosening of the fuel mass, but for rendering theclinkers accessible throughthefeed door of the furnace. These -and other advantages to be de rived from the use of my. grate, will be un derstood by those who read the following.

positions on the grate. 7

description in connection withfithe accom panyingdrawings in which-1 1 Figure '1 is a view of a furnace {Sh i front elevation parts being broken away ;;v

Figure 2 is a view of the grate lookingtowardvtlie front end thereof;-

Figure 3 is a vertical;longitudinal vi w of the furnace, parts being broken away;

Figure leis a sectional view of part-of the sifter showing one of theagitating pins (in elevation, and I 1 r ,7

, Figure 5 is a fragmentary sectional View grateand the sifter. I a

I vThe furnace 1 may be of any usualtype, and said furnace is 'providedwith a fire box: 2 within which-i s disposed the grate 3.

showing the sliding connectionbetween the l This igrate, which is preferably semi-0y lindrical in form, contains-transversely arranged grate barsf' separated; by washers v5 of any desired thickness as may be deten mined by the finenessof the fuel,"a nd these bars are-united by. tie rods 6 extending through aligned perforations of-said barsin.

,a'usu'al' manner. -The grate'is supported by two trunnions 7, 8,=respec tively mounted in bearings 9, l0,arranged at the front and the back of the furnace, the trunnion Tbeing long enough to protrude "through the front wall ofthe fire boxiwhereait is-s'quared to receive a suitable actuating handle.

The front platell of the grate,'i.s provided with spaced bars 12. ,andthe back plate 13-of said grate, is likewise provided with spacedba-rs' 114, the tie rods 6 being extended-through both ofthese plates in or-' derto hold them securely in their respective j The grate isprovided, at per edges, with afllongitudinal side bar 15' havingan L1ndercut groove- 16, and these each of its bars are secured to thegrate byscrewsnll Associated: with the grate is a remoyable sifter l8 which, likethe grate, is preferably of semi-cylindrical shape, whereby the grate and. the sifter constitute. a complete cylinder within which the, charge {of fuel may travel circumferentiall-y as the grate is revolvedor oscillated onsits trunnions to: thereby .agitate said charge and relieve it'of its ash con tent. During this operation the fuel charge will, by I gravitative action, continuously tumble down the rising wall of the device, thereby loosening the fuel to such extent as admit of a free flow of air therethrough when the ash-sifting operation is completed and the furnace resumes its normal operation. The clinkers which appear at the surface of the mass of agitated fuel, may, if too large to eventually be sifted out with the ashes, be conveniently removed through the feeding orifice of the furnace which, as shown, extends above the topof the grate a sufiicient distance to admit of the insertion and withdrawal of the sifter which is adapted to be interlocked with the grate in a removable manner. The sifter is open atthe ends, and affords, therefore, no obstruction to the insertion of an instrument through the feeding orifice of the furnace by means of which the clinkers may be taken out;

The sifter includes front and rear bowed angle irons 19 each having at each of its ends a foot 20 resting on and "secured to a slide bar 21 that is provided with a male dovetail 22 loosely fitting the under-cut groove of the corresponding side bar 15 to insure the easy withdrawal of the sifter after it has subserved its function, the foot and the slide bar being firmly united by 'machine screws 23. The sifter also includes a frame-work 24 of flat iron, suitably secured to the slide bars 21, and a longitudinal rib 25, which is fastened to the angle irons 19 and the frame-work 24 by rivets or other suitable devices.

Extending through holes in the rib 25, are depending and preferably pointed pins 26 arranged in a row, and each of these pins is provided with a shoulder 27. A wiremesh screen is sustained by the frame work 24, the lower edges of said screen being retained by hook bolts 29 suitably anchored in the angle irons or the frame-work of the sifter. The arched portion of the screen is held in position by the pins 26 which extend through said screen at several points.

The doors of the furnace are oppositely hinged, and are of such shape as to cover the feeding orifice of the furnace, which is of circular form to admit of access to both the Sifter and the grate, and each door is cut away, as shown, to permit of the protrusion of the trunnion 7.

The operation of a furnace embodying my invention is easily understood and conducted. Thefire is started in the usual way, and combustion of the. fuel is allowed to proceed uninterruptedly until it is necessary to eliminate the accumulations of incombustible matter and add new fuel. When this necessity arises, the front doors of the furnace will be opened, and the Sifter will be in ser'ted over the grate, the male dovetailbeing engaged with-the under-cut groove at the of the sifter to thereby cause "said sifter to'become, iii effect, a part of the grate and to partake of all of the movements thereof. As soon as the union of these ele ments is thus established, the grate will be revolved or oscillated on its trunnions until the unconsumed fuel is freed of its ashes and small clinkers and both have escaped through the spaces between the grate bars or through the meshes of the screen of the sifter, and fallen into the ash-pit of the furnace. It will be found that a portion, at least, of the clinkers which are at first too large to pass-between the grate bars or through the meshes of the screen, willbe broken up by the pins of the sifter into pi'ecessmall enough to be sifted out with the ashes, and that, in consequence of this sub: division of such clinkers as may be disintegrated, only a few clinkers will have to be removed through the furnace door. ;The pins, furthermore, greatly assist in the separation of the ashes and the fuel, since they are set close enough to themselves act as Sifters, and they also hold and carry with them considerable quantity of the fuel, thereby reducing the quantity of unburned lumps thereof which otherwise would be present on parts of the siftr screen and in- 7 terfere with the escape of the ashes.

The grate and the Sifter are both capable of eliminating the ashes of the charge of fuel, but ordinarily the sifter will be utilized because it is especially adapted for the work.

When the fire has been cleaned in the manner above described, the grate will be returned-to its normal pendent position, and the sifter removed through the front opening of the furnace. Fresh fuel may then be supplied, and combustion allowed to. proceed.

Having thus described my invention, what I claim is:

1. A grate comprising segmental end portions and intervening fuel sustaining bars, combined with a removable ar cuate and open-ended, ash sifter arranged to receive materials from said fuel-sustaining bars when said grate is inverted.

2. The combination with a furnace hav- 1 ing a revoluble grate, of a longitudinally removable sifter for said grate, the end of the combustion chamber being provided with an opening to permit the sifter to be attached to thegrate and removed at will.

3. The combination with a combustion chamber having an opening in an end thereof, of arevoluble arcuate grate .Silbstantially aligned witlrsaid epening, and an sifter forsaid grate adapted tb belon; gitudinally removed from said grate through said end opening. v The combination ivit-h combustion chamber having an end "opening of a grate revolubly mo inted' in combustion chania t. nd as t x. ea ers amenan opening and interlocked with said grate.

5. The combination with a combustion chamber having an end opening, of bearings for the trunnions of a revoluble grate, a revoluble grate mounted in said bearings, a sifter detachably. connected with said grate, and a closure for said end opening, saidend opening being of such area as to expose said grate and said sifter when said;

closure is removed from said opening.

v6. The combination with a grate, of a sifter having a sliding and interlocking engagement with said grate.

7. The conibination with a rotary-grater; fjof a detachable *sifter-having. ga row of spaced pins extending parallel with the axis on which saidgraterotates.' 1

8. The combination with an arcuate rev+ oluble grate having longitudinal 'grooves'in its edges, 0f aremovable ash Sifter provided with slide bars at-its' sides'conforming to. 20 a and interlocking with said grooves;

In testimony whereof I aflix my signature.

JOHN HARTMANN. 7

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