US1586860A - Sifter for ashes in furnaces - Google Patents

Description

June 1,1926. n 1,586,860

R. M. SWANSON SIFTER PCDR ASHES IN FURNAGES Filed June 12 1925 Patented June 1, 1926.

UNI-reo STATES isses ortica.

-srr'rnn son nenas-rn sunnites-1s.

application fueaqune 12 ,19.25. serial Sno. 36,662

@to provide a simpleand etic'i'entlash sifter adapted. to he disposed in a furnace and which wfillbe operated inthe furnace so that all. dust and dirt will be retained inthe fur nace and yyet the unburned fuel can be ileadi'ly separated..froml the ashes.

lt a urther object of theinventionfto provide ,such a device comprising, a support adaptedtobe disposed in vthe bottom ofthe uiinace'and extend ahoutthe walls thereof, together with `a screen carried on said suppont and mounted Fior reciprocating movementVsaifc'l screen preferably ybeing connected to the .grate 'bars in such a way that when the v,grate barsare movedY to shake. down the ashes the screen will 'be reciprocated.

.It is .more .specifically an object of the invention to provide an ash-sitter comprising ay bar bent to extend around the sides .and Y,rear ot' the furnace, vwxh-ich lbar has another ibar upstanding 'therefrom and extending. across the 'furnace on which .a flat screen is supported rand pivoted about a vertical axis,l which screen extends heneath the ,grate ybars, of a furnace and inclines 'forwardly and downwardly, 'the 'front 4edge of said screen being connected to rbars rigidly se cured to Ithe ,grate bars .at the liront end -so 'fthat the .screen will be `reciprocated when v`-the grate bars are moved, means also being provided 4to hold the 'front edge of `t'he screen in `elevate-d position. 'These :and .other objects andv advantages .o'f .the invention will be fully set Aorth in the jitollowing description made .in connection with ,the .accompanying drawings f,in which Llike reference characters re'fer .to fthe same :partstliroughout the different views, :andin Wlfich,

l 'is a view lin central vertical section through the ,lower part o'f a domestic .fun nace, with the .invention therein;

Fig'. '2 is a top plan view lof the ,sifting device; and i y Fig. is a vertical section taken on the line 3-3 of Fig. I, as vindicated hy the arrow, p l v Referring to the drawing-s, a portion oi a turnace ol the domestic typeis illustrated, i

of which it 'will' only be necessary to consider the base l-,the lower wall '5 which vsurrounds lt'he ash ,pit and which carries at its front a ,hingedy ash door- '6 and which has bearings 5a in which are rotatably mounted the 4grate bars 7, fsaid bars'hav'ing ,rods "7 ptojecting at their `front adapted to receive a crank or operating member which will "be inserted through lthe front of the furnace wall. The upper part vor wallfS of the lurnaceA4 forming the combustion ychamber is shown in part In accordance with the present invention,

a screen support .is provided `and while `various .suppontsmay be used, in the embodiment of the .inventionillustrated, a .support :isshown comprising a flat har I() which is bent Ainto llfs'hape and is .adapted to ex' tend along the sides 0I" the Afurnace wall .and

`around the ,semi-cylindrical rear portion y thereof. 'There Iis .often a ,ledge -or oiisetin u the wall of' Athelfurnace,adjacent the loottom ,and .said .bar 'lO conveniently tits therein.

The bar, as shown, is: disposed with itsllat sides vertical and ,has a 'IJ-shaped member 'l1 secured `thereto at opposite sides and has Va hat substantially horizontal portion extending across the furnace abovethe :door thereot. The member l1 :preferably .is formed ,in

tral top ,portion thereof, sai-d .ends 'being provided with a ,plurality :ot holles 11 through `an :alin'ing ipair of which `alheaded f two piecesflthe .ends overlapping at the cen- I 'holt 1"2 is ,adapted .to ,pass which, preferably, will lShe .equipped with .a clamping nut ,13

holding the overlapping ,ends ,of the porlt'ions tot :member 1l together; A hat screen '14k lis provided,preferably, 'having subst-anftially ,parallel 'side ,portions and :a semi-circular ,rear portion .so as to extend ysubstan- Ltially parallel to .the Aside wallsv of the-.'iur- ,nace and ybeneath .the grate bars thereof. The screen 14 .shown Aas connected tothe horizontal .l'ange citan-,angle bar 1'5 bent `to yextendga'round .thesides and ,rear thereof, the

lforward, `edge of the rscreen ybeing secured Ato a. that .'har 1.6 extending 'between k.thezends l.of the anglebar l'. Thescreen preferablyfis 4.additionally supported-hy a .transverse bei; .i

17 extending between the sides of the angle bar 15 and the screen is also provided with a central flat bar 18 which extends longitudinally and centrally.therebeneath. The bar 18 is provided with a hole adapted to pass over and surround the upper end of the bolt 12 so that the screen is supported on the member 11 about a vertical axis. It will be noted that the sides of the screen are spaced from the wall of the furnace so that considerable lateral reciprocation of the screen and its frame is possible. A pair of flexible members shown as chains 19 are provided having their ends attached at spaced points at the front of the screen, preferably to the bar 16 and these chains are engaged at their upper central portions over hooks 2Oa secured to bars 20, which latter bars have their upper ends bent around the rod 7L of the grat-e bars and rigidly clamped thereto by headed and nutted bolts 21. A rod 22 is provided which extends over and downwardly at each side of the rods 7 a and has a depressed central U-shaped portion 'depending between said rods 7a. rlhe end of the bar 18 is formed as a hook 18aM and this hook is adapted to be engaged in the depressed central portion of the rod 22.

A pan 23 is provided adapted to be seated in the forward part of the ash pit immediately inside the front wall, which pan has a short flange or wall at its front edge and i one side edge thereof and is provided with a pair of bail handles 2li and 25 disposed at one end and the front central portion thereof, respectively. Theinner edge of thepan is'flat and` extends a short distance under the forward edge of the screen 14C and one end ofthe pan is also flat or imobstructed and the pan can be held by the yhandles 24 and 25 and used as a scuttle so that the material therein can be thrown out at one end thereof.

In operation, the screen or sifter device will be disposed in a furnace, as shown and described. The'parts are'such that the same can be inserted at the front of the furnace and attached to the standard parts thereof. rlhe front edge of the screen normally is spaced a short distance above the bottom of the furnace. `When t-he operator rotates the Vrod 7 a shaking the grate bars for the purpose of shaking down the-ashes, the bars 2O will be oscillated and, owing to the connecA tion of these bars and the screen through the chains 19, said screen will be laterally reciprocated about the bolt 12. and unburned fuel dropping from the grate bars onto the screen 14 will thus be sifted by said screen and the parts too large to pass through the screen will pass downward and off the front end thereof and into the pan 23. Whensaidpan becomes full the same can be removed through the ash door and the contents of the pan can conveniently be The ashes thrown or' discharged into the furnace fire door. The screen 14 can be raised to engage the hook 18L on the rod 22 to hold the front cnd of the screen in elevated position when it is desired to shovel the ashes from the ash pit. It will be noted that the bottom of the furnace is substantially unobstructed and the ashes can be shoveled out as usual. If desired, the ash pan 23 may be omitted. The material not passing through the screen will vthen be collected at the front of the furnace and this material can be shoveled up before the ashes beneath the screen are removed.

From the above descriptionit is seen that applicant has provided a very simple and efficient ash sifter adapted to be disposed in a furnace. The sifter is operated .and the ashes are sifted without substantially any additional effort in operating the furnace. This sifting takes place when the grate bars are operated to shake down the furnace.

All dust is retained in the furnace and will quickly settle or be' carried off by the draft. The sifted ashes can be removed as usual and the unburned fuel can conveniently be saved. The device can be installed in practically all standard types of furnaces and the same is easily and inexpeni sively produced. The device has been amply demonstrated in actual practice and found to be very successful and efficient.

It will, of course, be understood, that varions changes may be made in the form, de-

tails, arrangement and proportions of the parts without departing from the scope of applicants invention, which, generally stated, consists in a'device capablev of carrying out the objects above set forth, in the when said grate bars are moved for discharging ashes said screen normally inclining downwardly toward the front end of said furnace to discharge coarse material.

2. An ashsifter for a furnace having in combination, va support disposed in the furnace beneath the grate bars and extending around the rea-r and sides of the furnace wall, a U-shaped bar upstanding therefrom, a fiat sifter supported on said U- shaped bar for lateral movement, said screen having substantially the form of said furnace wall and having a front edge spaced from the front of said furnace and normally spaced above the bottom of said furnace,

and means suspending said screen from the grate bars including rigid members rigidly connected to the grate bars and adapted to reciprocate said screen when said grate bars are moved t0 discharge ashes.

The structure set forth in claim l, said screen also being vertically movable about a transverse horizontal axis and normally inclining downwardly toward its front edge, said edge being normally slightly spaced above the bottom of the furnace, and a support for holding said screen in position With its front end elevated.

4. An ash sifter for a furnace having in combination, a support disposed in the furnace beneath the grate bars, a screen supported thereon for oscillating` movement about a substantially vertical axis, means detachably connected to the grate bars and connected to said screen for supporting and oscillating said screen.

5. An ash sifter for a furnace having in combination, a bar bent to extend around the sides and rear of the interior Wall of a fur-l nace at the bottom thereof, a supporting bar upstanding from the sides of said bar and flexible members connected to said screen,

rigid bars connected to said flexible members and rigidly connected to said grate bars whereby when said grate bars are moved for shaking ashes, said screen Will be laterally reciprocated.

In testimony whereof I aiiix my signature.

RICHARD M. SWANSON.

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