US2394828A - Stove - Google Patents

Description

Feb. 12, 1946. F. K. wEs-rLAKE ETAI. 2,394,828

STOVE Filed May 21, 1941 Patented Feb. 12, 1946 GFFICE STOVE Frank K. Westlake, Shelbina, and Robert E. Rasmuson, Macon, Mo.

Application May 21, 1941, Serial N0. 394,408

2 Claims.

The present invention relates to a stove.

Briefly, the stove of the present invention comprises an outer casing, in the bottom of which is formed an ashpit into which air may enter. Above the ashpit there is a fuel box or bed, the side walls of which are spaced inwardly from the outer casing at certain points to provide ues which communicate with the ashpit and which also communicate with the inside of the fire box. Above the fire box there is a combustion chamber.

An object of the invention is to provide a stove of this kind having a deep fire box wherein the burning of the fuel takes place at the bottom and wherein coking of the fuel takes place above the burning, together with means to carry the gases obtained by coking into the lateral iiues wherein they may mix with secondary air and burn; and also to provide a combustion chamber above the fire bed wherein any and al1 additional gases may be burned.

A further object is to provide a grate and a control combined therewith for determining the amount of secondary air admitted to the Iiues and also to provide clean-out means for the lues. Other objects and advantages will be apparent from the following description taken with the drawing.

In the drawing:

Fig. 1 is a vertical mid-section through the stove;

Fig. 2 is a horizontal section taken on the line 2-2 of Fig. 1;

Fig. 3 is a horizontal section taken on the line 3-3 of Fig. 1;

Fig. 4 is an inside view of one of the tiles; and,

Fig. 5 is an outside view thereof.

The stove includes a base member I on which is disposed an outer casing II of steel or cast metal. Surmounting this is a dome or cap I2, from the upper end of which extends a smoke pipe I3.

Spaced above the base member I0 is a plurality of ledges Ill, or the like, formed on or secured to the inside of the outer casing l I which receive a supporting member I of the configuration shown having ports I6 therein for a purpose to be described. Supported on the supporting member I5 is a ring I'I, which has ports I8 adapted to register with the port I6. The supporting member I5 has a sunken center portion I9 which receives a grate 2D, and an annular raised flange portion 50.

A shaker handle 2| is secured to the grate 20 and also engages al loop 22 depending from the ring I1 so that operation of the shaker handle 2| simultaneously shakes the grate 20 and the ring II.

The base In and the member I5 together with the lower part of the casing II form an ashpit 24 having a clean-out and draft door 25.

Supported upon the flange portion 50 of the member I5 is a plurality of tiles 26. The tiles 26 are disposed in two superposed courses and all tiles 26 are identical. The tiles 26 are thus supported out of contact with the ring I'I which is thereby free to be rotated.

Each tile 26 has a cross-sectional shape as shown in Fig. 2 to provide an inner face 21, an outer face 28 preferably arcuate so as to fit against the casing Il, and opposite end faces 29 that are radial with respect to the arcuate face 2-8 so as to t against corresponding faces of adjacent tiles. In addition, each tile 26 is provided with notches 30 cut out of the corners between the arcuate face 28 and the edges 29. Further, each tile 26 is provided in its edges 29 with grooves 3| disposed between the upper edge 32 and the bottom edge 33 thereof.

When the tiles 26 are disposed together as shown in the drawing, the edges 29 of each tile 26 engage against corresponding edges of adjacent tiles 26. The notches 30 of adjacent tiles 26 unite to form vertical flues 35. The grooves. 3| come together to form ports 36 leading# from the several nues 35 to thev fuel box or bed 3l formed within the cylinder of tiles.

As a result, thereis a deep fuel bed that may reach to the top 0f the upper course of tiles, which is indicated separately at 38.

Above the edge 38 is the dome or combustion chamber 40. Into it both the fuel bed 31 and the flues 35 open. It is provided with a fuel door 4I.

To illustrate what have been determined'to be very satisfactory proportions, the inside of the shell II may have a 19 diameter. For this size, preferably each tile is 91/2 in height, giving a total lining or fire box height of 19" above the member Il. There are ten tiles employed in each course.

The flues 35 are radially 1 deep and the edges 29 are also 1" deep radially.- The cordal dimension of therues 35 at their narrow inner portion is1%. The cordaldimension of the face 28 is 3". Adjacent the ports 36, the sloping edges 30 are continued inwardly to a point 1A from the edges 29, making the ports 36 to be 1/2 wide. They are also 51/" in height and are disposed 1 from the near end of each tile.

the ues 35 and causing the air to flow throughY s the grate to provide rapid and thorough com-Yv bustion.

When a supply of burning coals is established, Y a large supply of coal may be put in through/the door 4| until the entire fuel box is filled upto the Then the shaker handle 2ly mayv be;

edge 38. Y operated to open the ports into the flues 35. By

this means, some of the air entering through the f ashpit passes through the gratev 2U as primary air and additional al1-passes into the. flues directly as secondary air. The primary air, of course, continues the combustion at the bed of coals. t causes heat to rise up through the coals and also generates fromthe coals gases in varying vstates of incompleteV combustion.

Since there is a steady ilow of air up through the iues 35, this` air flowing with some velocity, there will be entrained' in the lues these. gases from the" incomplete combustion of the coking coalv drawn from the re'box 31 through the ports 36. These gases are very hot but within the re bed are supplied with an inadequate amount of oxygen to support combustion. At least this is true of those comingifrom the upper parts of the fuel bed. Those coming from right oif'the bed of coals may actually be burning. In any event, when a mixture of these gases with the free air entering the i'lues 35 from the ashpit occurs, combustion takes place in the flues'35. This combustion occurs right' against the casing Il and heats the same to provide a very desirable disposition of the re within the stove to a maximum heating of the room. Y

Allofthe combustion'd'oes not take place` in the dues. ofthe iiuesa'ndA passing into the dome lf3 are not Some of the gases leaving the upper ends@ stove Which fullls all of the objects and advantages sought therefor.

It is to loe-understood that the foregoing description and the accompanying drawing are provided for purposes of illustration and not limitation, the invention being defined by the claims which follow.

We claim:

1'. In; afheater, a roundi casingY providing an ashv pit', a fuel chamber area. above"4 the ash pit and a combustion dome above the chamber, grate supporting means above the ash pit, a plurality of tiles supported above the grate, said tiles each being generally arcuate, with radial side edges v:that converge toward the center of the casing, and the'vtiles being sized so that when disposed in the casing they will lt with their outer surfaces completely burned. Likewise,l there are gases `last from one and a half t'o two days without rell.

As heretofore suggested', the flues 35'must'not be so large that they draw'all-ofV the airfrom the Y ashpit or that they cool down the gases coming olf the re. Either case will' result in incomplete burning of these gases. Likewise, the re bed must be deep'enough not only to hold" a supply of coal sufficient for a long operation of thestove, but' alsoto insure that the c'oal will have sufficient time to coke completely'by the time it reaches the fire bed itself. Yet the flues must be large enough to insure some velocity of air adequate to encourage the flow of the gases from the fire bed through the ports 36- into the flues.

Itis apparent that there has been provided.v a

substantially against the inner wall of the casing for support outwardly, their side edges will engage to give support radially inwardly, said tiles thereby having cooperating inner surfaces forming a fuel chamber, and said chamber being at least as deep as itis Wide, each of said tiles having its side Vedges cut awayadjacent their outer surfaces to cooperate with corresponding parts of adjacentA tiles to form, with the casing,vertical ues adjacentfthe casing and extending from the ash pit to the combustionl dome, said side edges being likewise cut away adjacent their innerrsurfaees Ito provide portsconnecting the vertical ilues with 2'. In a heater, an outer casing providing anV asn. pit, a fuel chamber above the ash pit and a combustiondome above the chamber, grate means vacross the casingk above the ash pit, a plurality of 'tiles'supported above the grate, said tiles being set side by side around the inner surface of the casing with the outer tile surfaces against the innerrcasing surface to form a lining therefor, each tile having its side edges against vthe side edges of the adjacent tiles, and the combined `inner'surfaces of the tiles forming a. fuel chamber, said fuel chamber being at least'asdeep as it is wide, the tiles being cut away at their side edges adjacent their outer surfaces to provide a plurality of' Vertical nues closed by the casing-said fiues being separately disposed at least substantially alll around the casing, said flues extending from the ash` pit to' the combustion zone,A said tiles also being cut away attheir side edges from `several vertical flues being only suflicientto admit Ysubstantially enough airV to' provide an entraining ow ofsecondary air from the bottom to the top thereof,to support complete combustion for the Y gases .drawn therein through the connecting ports, and the connect-ing ports 'being only large enough. to pass gases from the fuel chamber to be mixed in. said flues to. provide combustion thereof in the ues andin the dome.

` `FRANK K. WESTLAKE.

A ROBER'E E. RASMUSON.

Images