US2194868A - Wood burning brooder stove - Google Patents

Description

March 26, 1940. J. B. OLSON ET AL WOOD BURNING BROODER STOVE 2 Sheets-Sheet 1 Filed Dec. 23, 1937 lNl/ENTORS JOHN B. 01.50 WILLIAMM. W/LLETT A 7' TOIQNEY March '26, 1940. J. B. OLSON E1 AL WOOD BURNING BROODER STOVE Filed Dec. 23, 1937 2 Sheets-Sheet 2 FIG. 7 1

//VVNTOR$ JOHN B. OLSON W/LUAM M W/LLETT BY AT OQNEY Patented Mar. 26, 1940 woon BURNING BROODER STOVE John B.- Olson and William M. Willett, Fort Atkinson, Wis., assignors to James Manufacturing Company, Fort Atkinson, Wis., a com- Application December 23, 1937, Serial No. 181,363

4 Claims.

This invention relates to an improvement in ba'ooder stoves which are especially adapted to burn Wood. The objects of the invention are to provide a stove proper, suitable for this and other purposes which has an improved operating and controlling means to thereby provide maximum efiiciency and accuracy of control.

In a stove of the class it is desirable and economical to have the least possible fire while still holding the temperature constant. Wood burns readily when too much air is admitted, therefore in a burner wherein the fuel is replenished infrequently, the controlling device must be positive and accurate as to the quantity of admitted air and it must be sensitive to temperature changes.

It is an object of the present invention to reduce the fluctuation of temperature to a minimum by the use of positive and sensitive air and stack gas control in combination with a feeding door and an ash door whichare practically airtight.

A further object of the present invention is to provide a stove proper or housing having very few joints which may be made practically airtight.

A further object of this invention is to provide means whereby the air for combustion is fur,- nished to the center of the chamber by means of an inverted channel and a comparatively small grate which is centrally positioned a distance above the bottom of the housing whereby a considerable accumulation of ashes on the bottom around the grate and channel will not shut off the supply of air to the grate.

One of the principal objects of the present invention is to provide convenient means forstacking and holding the wood toward the center of the chamber, so that the wood will burn from the center outwardly, cooperating with an ash door which provides access to the entire bottom of the chamber whereby excessive ashes may be removed from around the grate or from under the grate and from under the channel.

One of the contributing factors to the successful operation of our invention is the manner of controlling the air supply to the grate in combination with a chimney check valve and a chimney choke valve each being adapted to be operated simultaneously but oppositely by means of a connection to the thermal device, whereby satisfactory results may be secured from the burning of wood under all atmospheric conditions and under varying chimney drafts.

To these and other useful ends our invention consists of parts and combinations thereof or their equivalents and mode of operation as hereinafter set forth and claimed and shown in the accompanying drawings in which:

Fig. 1 is a vertical transverse section of our improved device taken online ll of Figure 2.

Fig. 2 is a vertical section of the device taken on line 2--2 of Figure 1.

Fig. 3 is a fractional section of the device taken on line 33 of Figure 5.

Fig. 4 is an enlarged fractional section of the device taken on line 44 of Figure 1.

Fig. 5 is an enlarged fractional section of the device similar to that shown in Figure 2 except illustrating a modified thermal controlling device.

Fig. 6 is a fractional enlarged section taken on line 6--6 of Figure'l. 2

Fig. '7 is a section taken on line l--'! of Figure 2.

As thus illustrated we provide a chamber hav ing preferably a parallelogram shape horizontally and vertically, the vertical walls of the chamber being designated by reference numerals I0,

the bottom of the chamber being designated by numeral II and the top by numeral I2. These members II and I2 are secured to the side walls by means of a folded joint or by interval welding as at l3 (see Figure 3).

Thus it will be seen that the inclosure may be rectangular in cross section, square, round, oval or any suitable shape and may be manufactured at low cost and in a manner which will provide a I strong and air-tight inclosure.

We. provide legs l5 which, when the inclosure is square or rectangular, are secured to the corners of the closure and are made of a suificient length so as to hold member II a proper 'distance from the floor soas, to providesuitable ranging room for the chicks.

We provide preferably three hover members l6 which are positioned and made of a shape to correspond with the shape of the chamber; thus these members may be secured together and supported by the chamber as at IT. Rear member IBA is preferably detachably secured to the chamber and to side members It.

Thus we have provided a simple, light and easily manufactured hover which is easily positioned around the stove and whereby the controlling mechanism} and the ash door are made accessible by simply removing one section of the hover.

We provide a grate l8 which is positioned in the inclosure as illustrated and having a rearwardly extending plate l9 each having downwardly extending flanges 20 and 2| and member l9 being secured to member H! as at 22. The free end of the grate is supported on member H by means of legs 23.

A housing 25 (see Figure 2) is secured to member l9 forming a cover to inlet opening 26 in member I0. This housing is shaped as illustrated so as to provide an air inlet opening 21 and an ash door opening 28. Housing 25 is provided with a rearwardly extending arm 29 having a lever 30 which is hingedly supported at its rear end to member 29 by means of a bolt 3|.

We provide the usual thermal control wafer 32; thus by adjusting bolt 3| lever 30 may be controlled directly by wafer 32 to operate the dampers and control the fire in the chamber as follows:

A valve 35 is pivotally mounted to housing 25 as at 36 and is provided with a link connection 31 to lever 39; thus the position of lever 30 will control the opening 21 by means of valve 35.

We provide a chimney housing 40 being adapted to support the usual stove pipe 4|. We provide an opening 42 in the top of member 12 and an opening 43 is also provided in the rear of member 49. A lever 44 is pivotally supported in a notch formed in member 40 as at 45. This supporting means is in reality a valve 46 which is adapted to cover opening 43 more or less, depending upon the position of lever 44. The forward side of valve 46 is provided with a forwardly extending lever 41 having at its end a hook 48.

We provide a valve 49 which has a loop 59 which is adapted to be freely supported by hook 48. Thus it will be seen that as the rear end of lever 44 is lowered, valve 46 will open inlet 43 and lever 41 will be caused to close valve 49. Thus opposite motions are imparted to the valves simultaneously by means of lever 30 through a link 5!. Thus by scrutinizing Figure 2 it will be seen that wafer 32 will control the position of these three valves simultaneously and that when valves 35 and 49 are closed valve 46 will be open. That is, when wafer 32 is expanded so as to call for less heat, valves 35 and 49 will be closed and valve 46 will be opened so as to reduce the vacuum in the stove chamber caused by chimney 4|. It is not desirable to entirely close opening 42; we therefore provide an orifice or two in valve 49 so at all times there may be passage of gases into the chimney even though the air is positively prevented from entering the stove.

Thus it will be seen that we have provided a three point control wherein the chimney draft will be reduced almost to zero by means of a check draft inlet when the grate air is entirely shut off and that the chimney inlet from the stove chamber will be practically shut off at a time when the check draft is open. Thus the vacuum in the housing will be practically zero when the temperature under the hover has reached maximum and when the temperature under the hover has fallen below the desired amount the valves may finally reach a point when the inlet to the grate is wide open, valve 49 is wide open and valve is closed thus to create maximum draft.

We provide means in member l2 for supply ing fuel in the following manner:

An opening 60 is provided of sufiicient size having therein an upwardly extending flange 6|. A flanged lid 62 is provided which is adapted to fit snugly over flange Bl. We secure a flanged plate 63 to the bottom of member 62 providing an air space 64 thus to provide a heat insulating lid for the top of the stove.

We secure U shaped brackets 65-455 to member I2 as illustrated and secure bar 66 to the top of member 62 by means of a spacing washer and a rivet 61, the bar being left free to turn on the rivet and spacing washer.

A hand piece 68 is provided. Member 66 is adapted to extend under the upper portion of member 65 as illustrated, this portion being slightly lower than the ends of member 66; thus when the lid is placed over the opening and pressure is applied to member 68, which may then be turned so the ends of member 66 are under the upper ends of member 65. Thus lid 62 will be caused to firmly engage flange 6i as clearly illustrated in Figure '7. Thus the lid will be held snugly in position and practically form an airtight seal.

In Figure 5 we illustrate a modified form of temperature controlling device being positioned near the stove thus to be suitable for use without the hover, wherein a supporting arm 10 is provided, having a U shaped bracket H, alink l2 and a lever 13 to which link 3'! is attached as illustrated.

We provide a rod 14 which is pivotally secured to lever 13 as at '15, the rod extending through member 10, the end being adapted to support wafers 76, the wafers in turn being secured to a rod '11.

We provide a U shaped bracket l8 through which rod 71 extends. Rod H is threaded for the reception of adjusting nut 79. We provide a washer which supports nut 19 against the pressure of spring 8|. Thus nut 19 may be turned in order to secure the desired temperature through expansion and contraction of the wafers.

In Figures 1 and 2 we illustrate the chamber as having been supplied with ashes for the purpose already described. It will be seen that the ashes will direct all of the air to the grate and that they will provide a suitable insulating material for the bottom of the stove and a suitable support for an accumulation of wood in the stove.

We provide a lid 82 of a suitable shape to close opening 28. Hooked rod 83 is loosely mounted in lid 82 as illustrated having a spring 84 whereby when the lid is placed into position over opening 28 member 83 may be pushed forward against the pressure of the spring far enough to hook over bracket 85; thus lid 82 will be spring held against the opening in member 25. When it is desired to remove ashes or to clear the grate, lid

82 is removed and a suitable rake used for the purpose.

It will be seen by observing the various figures that this rake may be made long enough and have a shape at its end to reach practically every part of the inclosure; thus obviously it is a simple matter to remove surplus ash and clear the grate and air passageway under member I9.

Clearly we have provided a simple and eflicient brooder stove, that may be manufactured at low cost, that will be under perfect wafer control.

Having thus shown and described our invention we claim:

1. A stove of the class described, comprising a rectangular in horizontal and vertical section chamber, a fuel inlet door and a chimney outlet in the top of said chamber, a relatively small centrally positioned grate in said chamber having downwardly extending flanges on its sides, the bottoms of the flanges being spaced a short distance above the bottom of the chamber, an inverted channel integral with or secured to said grate and extending outwardly to one of the walls of said chamber and being secured thereto the flanges registering with the grate flanges, an

air inlet in said chamber positioned below said channel and extending to near the bottom, of the chamber and being less in Width than said channel at its contact with said chamber wall, an air inlet'valve and an access door operatively connected to said inlet, whereby the bottom of said chamber around said grate and channel may be covered with ashes to or above the top of the grate and channel whereby a sealed air passageway is formed from said inlet to said grate.

2. A stove of the class described, comprising a chamber, a fuel inlet door and a chimney outlet in the top of said chamber, a relatively small grate centrally positioned in said chamber having downwardly extending flanges at its sides the bottom edges of which are positioned a short distance from the bottom of said chamber, an inverted channel secured to or forming an integral part of said grate the flanges of which register with the grate flanges, the outer end of said channel being secured to the wall of said chamber, an air inlet in said chamber the top Y an access door operatively connected to saidinv let, whereby said chamber around said grate and 7 channel may be covered with ashes to or above the top of the grate and channel to th'erebyform a sealed air passageway within said channel from said inlet to said grate.

3. A device as recited in claim 2 including; draft controlling check valves in said chimney outlet-thermally controlled means operatively connected to said inlet valve and to said check valves whereby combustion will be automatically controlled. l

4. A device as recited in claim 2 including; relatively slender supporting means secured'to the free end of said grate and resting on the bottom of said chamber thereby leaving substantially the entire bottom of said chamber free for '7 contact with a poker which may be inserted in said air inlet.

JOHN B. OLSON.

WILLIAM M. WILLETT;

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