US 970460 A
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UL. o'. BREKKB. STOVE AND FURNAGB GRATE.
APPLICATION FILED APR. 28,1910.
2 SHEETS-*SHEET 1.
L. O. BREKKE.
STOVB AND FURNAGE GRATE.
APPLIGATION FILED APn.za,191o.
2 SHEETS" SHEET 2 and the UNITED STATESNPATEN T OFFICE.
LEWIS 0. BREKKE, OF SEATTLE, WASHINGTON.
STOVE AND FURNACE GRATE.
Specification of Letters Patent.
Patented Sept. 20, 1910.
Application filed April 28, 1910. Serial No. 558,308.
To all whom it may concern:
Be it known that I, LEWIS O. BREKKE, a citizen of the United States, and a resident of the city of Seattle, in the county of King State of Vashington, have invented certain new and useful Improvements in Stove and Furnace Grates, of which the following is a specification.
My invention relates to an improvement in stove and furnace grates, and comprises the novel parts and combination of parts defined in the claims terminating this specification.
The object of my invention is to improve the construction and operation of stove and furnace grates.
In the drawings I have shown my invention embodied in the form which is now preferred by me.
Figure l is a central sectional elevation through a stove equipped with my grate. Fig. 2 is a horizontal section through the stove, mainly above the grate parts of the casing and of the central cones being broken away. Fig. 3 is a plan View of the fixed central cone and its supports. Fig. 4 is an elevation of the same. Fig. 5 is a horizontal section through the central cones upon the plane X, X, of Fig. l. Figs. 6 and 7 are plans of the two movable grate members. Fig. 8 is a plan of the two movable grate members placed in position for discharge of clinkers.
There are three parts to my improved grate, a fixed central hollow cone having draft slots, and two annular' grate members OScillatable about said cone and one provided with a slotted cone coperating with the fixed cone.
The central fixed cone l may be supported in any suitable way, as by arms ll which are secured to the body of the stove or furnace, and is provided with draft openings which preferably are in the shape of longitudinal slots tapering toward the apex. This fixed conical grate forms a pivoting member for the outer grate, and in addition, it co-acts with the oscillatable cone to control the amount of air admitted at this point. Next above this is the annular grate member 2, having a central hole 22 adapted to fit over the base of the cone 1, and having segments containing clinkerdischarge openings 20 alternating with segments containing radial draft openings 21. It also has an operating arm 24 which extends outwardly of the stove through a suitable slot 32, so that it may be engaged and oscillated about its center. Superposed on the grate member 2v is the grate member 4. The grate member 4 has an annular portion having segments provided with draft slots 40 alternating with segments containing the clinker discharge openings 41. The grate member 4 has a central cone 42 fitting closely to and over the xed cone l and having corresponding slots 43 which are adapted to register with either the slots or ribs of the fixed cone l, according as it is turned, thereby acting as a damper to control the amount of air which is admitted thereby. This grate member 4 also has an arm 44 extending through the slot 32 so that the grate may be oscillated.
By operating both grate members 2 and 4 at the same time, keeping the o] )erating arms or levers 24 and 44 together, the ashes are sifted through the draft slots 2l and 40. By slightly shifting the relative positions of these levers the draft through the central opening may be controlled in amount or even cut off. By shifting the arms 24 and 44 so as to separate them, as is shown in Fig. 8, elinker discharge openings are made, through which all large particles may be discharged. Vith this form of grate the operator has a thorough control of the air admission and 'the cleaning of the grate. I have found that the central draft openings as provided by the cones l and 42, admit the air to the center of the fire where it will do the most good. There is a material advan- 'tage in having this central draft member in the form of a cone and in having the slots tapering with the small end up. As the body of the coal and clinker settles toward the grate it runs down the side of the cone 'to a part which is Wide enough to admit their passage. By reason of these features of construction this part of the grate is self cleaning. The lower annular portions of the grate may become somewhat clogged up with clinkers and ashes, but the cone will keep clear, thus freely admitting the air to the center of the fuel body, which has 'the effect of directing the heat to the outer part of the lire where it will be most effective in heating the external air. The result is a cleaner and more perfect combustion as well as a hotter fire.
cheap to manufacture, easfy to pu't in place and easy to handle.
What I claim as my invention is A l. A grate comprising a fixed hollovsr cone having longitudinal draft slots therein, an osoillatable annular grate about said cone, a second 'oscillatable annular grate superposed on the first and having a cone fitting the other cone, said movable grateshaving separate operating arms extending to the outside of' the stove or furnace.
2. A gratev comprising a fixed central cone having taperinglongitudinal slots, tWo grate members mounted to turn independently and concentric With said cone, one of said grates having a cone similarly slotted and fitting on the fixed cone.
3. A grate comprising a fixed, hollow cenholloW slotted trall cone having draft slots, tWo concentric annular members havingl clinker-dischargel openings alternating with segments having draft openings and movable about said central cone and relatively to each other; one
. of the said annular members having a eentral cone superposed upon the fixedvcone and provided with draft slots adapted to register oralternate With 'the draft slots in the fixed cone, said annular members having operatying arms extending to" the outside of the stove.
In testimony whereof I have hereunto affixed my signature at Seattle, King county, Washington, thislGth day of April, 1910.
LEWIS O. BREKKE.4
H. L. REYNOLDS, E. BRYAN.