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Publication numberUS2199875 A
Publication typeGrant
Publication dateMay 7, 1940
Filing dateDec 3, 1938
Publication numberUS 2199875 A, US 2199875A, US-A-2199875, US2199875 A, US2199875A
InventorsM. L. Brogden
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
ubrogden
US 2199875 A
Abstract  available in
Images(4)
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Claims  available in
Description  (OCR text may contain errors)

May 7, 1940. M. L. BROGDEN HEATING sTovE Filed Dec. 5, 1938 4 Sheets-Sheet 2 May 7,1940. M. LQBRoG-DEN 2.199.875

HEATING STOVE Filed Deo. 5, 1938 4 Sheets-Sheet 3 Mczxcyllee Brogcey n4 rame@ Mayr,

NUNITD STATES PATENT; oFFIECE.

mme srovi:

Muay Lee Braden, columbia, S. c. 'Application December 3, 193s, serial No. 243,838

11 claims.. (ci. :3c-ee) My invention relates to improvements in stoves.

An important object of the invention is vto provide thermostatic ,means in the nature of an attachment, which may beapplied to a conventional heating stove, without materially altering the construction of the same, and which will serve to automatically regulate the supply of air for combustion.

A further object of the invention is to provide thermostatic means of the above mentioned character, which is extremely simple in construction, and so arranged that a portion of the solid thermostatic element projects into the interior of the stove casing. c

A further object of the invention is to' provide thermostatic means for actuating the damper or air supply regulating element'which is mounted upon the movable door of the stove and which will permit of the freeopening or closing of the door, without disturbing the operative relation between the thermostatic means and the damper.

A further object of the invention is to provide means whereby a part operated by the thermostatic means is separated from a part movable with the damper, when the door carrying the damper is shifted to the open position.

A further object of the invention is to provide an indicator for showing the relative position of the damper.

Other objects and advantages of the invention will be apparent during the course of the following description.

In accompanying drawings forming a. part of this application and in which like numerals are employed to describe like parts throughout the same:

Figure 1 is a perspective view of a stove embodying my invention,

Figure 2 is. a. central vertical longitudinal section of .the same,

Figure 3 isa. transverse vertical section taken on line. 3-3of Figure 2,

Figure 4 is a horizontal section taken online 4-4 of. Figure 2,

Figure 5 is an' elevation of the inner side of `the valve and cap carrying the same,

Figure 6 is a perspective view of a stove embodying a second form of the invention,

Figure 7 is a' horizontal section taken on line 'If-"I of Figurev 6,

Figure 8 is a vertical section taken on line 8-8 oflElgure'Z,A f

`Figure 9 is a vertical section taken on line 9-9 of Figure 6,

Figure 10 is an elevation of the inner side of the ash door, damper and associated elements,

Figure 11 is a perspective view of the damper, thermostatic element, and associated elements, and,

Figure 12 is a perspective View of the indicator disk.

The present application is a continuation in part of my pending application for Heating stove, iiled December 3, 1937 Serial No. 178,004, allowed l0 November 4, 1938, now abandoned. y

In the drawings, arranged for thepurpose of` illustration, are shown preferred embodiments of my invention, attention being called rst to Figures 1 to 5 inclusive, the numeral 5 designates the 15 casing-'or body portion-of a heating stove, designed for/fburning wood,l although the invention; is not restricted to a wood burning stove. The casing 5 is ordinarily formed of sheet metal and is supported by legs 6 and has the usual coupling 20 or fitting 'I at its with the usual pipe.

Rigidly connected with the front end of casing forward end, for connection 5 is an air supply sleeve or tubular housing 9;

This sleeve is preferably cylindrical and prefer- 25 ably has its longitudinal axis arranged at a slight inclination from the horizontal. The inner end of this sleeve is in free communication with the interior of the casing 5. The outer end of the sleeve 9 isadapted to be covered by a cap, closure 30 element or door I0, hinged thereto at vits top, as shown at il, and the cap, closure element or door, is held in the closed position by a sprng. catch I2. This spring catch engages over a iiange I3 formed uponl the sleeve9 and the cap or door 35 has a. flange I4 to receive the ange I3, so that. the cap or door has substantially an, air-tight it with the sleeve 9, when the cap is' closed. The cap or door is provided to regulate the supply of air into the casing 5 to support combustion, and. 40-

for this reason the cap or door has segmental openings, I5, adapted toregister-with openings II formed in a pivoted valve I1, arranged upon the outer side of the c ap or door. By turning the valvev I1 the openings I5 may be partly 45 or completely-covered or closed. 'Ihe stove thus described is that of the usual 'or kconventional wood burning stove. l f

In accordance with my invention, I provide a vertically swinging valve, damper, or disk l8, 50

which is arranged within the sleeve S and.v is hinged to the cap or door I0, as shown at ISLk The valve or damper I8 is of a suitable diameter to cover the segmental openings I5. The cap or door III is vertically inclined on account of u of the housing 28 is a horizontal rock-shaft 2l,

the inclination oi' the sleeve 9, and when the valve or damper I8 is released, and since it is pivotally supported at its top, it will move from the cap or door I3 to assume a vertical position and hence become spaced from the cap or door and thereby open or uncover the segmental openings I5, permitting the airr to enter the casing 5 to support the combustion. However, this air will be carried to a considerable extent downwardly about the lower portion of the valve or damper I8.

'Ihe numeral 28 designates a vertically arranged housing, securedvto the casing 5 by rivets or thelike. This housing is arranged exteriorally of the casing 5 and above and adiacent to the sleeve 9. Mounted within the upper end to which is attached a solid thermostatic elev ment 22, whichis straight at low temperatures.

has no connection with the valve or damper I8.-

It is thus seen that when the cap or door I8 is opened, the valve or damper I8, being unconnected with the nger 23 moves from th'e same, without disturbing the thermostatic element.

Adjustable means are provided to regulate the starting angular position of the bar thermostatic element 22, comprising a rod 24. having screwthreaded engagement with the housingV 28 at 25. The rod is turned by a knob 26. The inner end of the rod has swiveled connection with the bar thermostatic element 22, which is effected by providing the bar 22 with an elongated slot 21, to receive the rod 24 and spacingsleeves 28 upon the rod 24, upon-opposite sides oi the bar 22, these sleeves being clamped to the rod. 'I'he bar thermostatic element 22 extends through a slot 29 formed in the top of the sleeve 9.

It is thus s'een that I can apply my thermostatic device upon the stove without materially altering the construction of the same.

The numeral 38 designates a guard or plate which I prefer to attach to the interior of the casing 5 so that this guard will extend over the upper portion of the bore of the sleeve 9 and cover the thermostatic bar element 22 and its nger. This guard will prevent wood or the like contacting with the thermostatic element and serves to retain .the sleeve 9 free and unobstructive.

In operation, when the stove is relatively cool, the valve or damper I8 is in the vertical open positionand air is drawn into the casing 5 through the openings I5 and passes about the edge of the valve I8 and enters the lower portion of the casing 5. As the combustion increases the bar thermostatic element 22 is heated and bends, moving the finger 23 ytoward the valve or damper I8, which in turn moves this valve or damper toward the openings I5 until the openings are covered to cut of! the supply of air. The degree of heat necessary to completely close the. valve or damper I8 will depend upon the starting angular. position of the bar thermostatic -element 22.

. the'inner side of the door member 52.

mounted upon the jacket 31.

vor room'heating st'ove or furnace. This stove embodies -an inner casing 36 andan outer Jacket 31, spaced from the inner casing and ailording to 12 inclusive, r have shown a second modification of the invention. In these an air chamber 36', for the circulation of Th'e air enters at th bottomof this chamber and discharges from its top. 'I'he inner casing 36, at its top, discharges the product of combustion into the Ausual pipe 38. Numeral 39 designates the door for the introduction of fuel, such as coal, the usual grate being provided, below which is a horizontally swinging ash door 48, hinged at 4I.

This ash door is provided with Il a draft opening 42, the area of which is regulated by an adjustable valve or damper 43, adapted to be clamped in the selected adjusted position by means of a bolt 44 or the like. The

draft opening 42 discharges air into the ash pit 80 below the usual grate and the opening 42 is ver-l tical. A housing 45 is arranged upon the inner side of the horizontally swinging door 48 and is attached thereto by screws 46 or 'the like. 'Ihis housing may be formed of sheet metal or other suitable material and has a vertically inclined side wall 41, extending inwardly in an upward direction. This side wall 41 has a draft f opening 43, adapted to be covered and uncovered by a valve or damper 49, hinged at lits upper end, as shown at 58, with the side wall 41. The valve or damper 49 automatically gravitates to the vertical position .to uncover the draft opening 48, but will cover this draft opening when swung toward the side wall 41.

The door 48 covers the opening which leads into the ash -pit of the inner casing 36 and this door 48 has an outwardly projecting sleeve or tubular portion 5I, having the opening 42 therein. This sleeve extends through an opening formed in an outer door member 52, movable lablebolt 55, arranged to contact with the inner side of the valve or damper 49, but free from connection therewith. The rock-shaft is `fournaled in openings formed in the ends of the sleeve or tubular portion 5I and this rock-shaft isjconnected with a second rock-shaft 56 by means ofV a universal joint 51. The rock-shaft 56 is journaled'in a bracket 58, mounted upon The with 'the door 48 and serving to cover the ash rock-shaft 56 is provided at its free end with an upstanding crank 59, arranged within the space .36'. Clamped to the rockshaft-56 adjacent to the vertical crank 59 is a horizontal crank 68,

carrying a pin 6I.

The numeral 62 designates a vertical supporting strip, arranged within the space 36', and

` 'I'his supporting strip 62 is stationary andl carries a horizontal stationary bracket 63, upon which is pivoted at- 64, a. oar` thermostatic element 65.y 'I'his bar thermostatic element is made of strips of metal having diierent coemcients of expansion, and

will bow inwardly, when heated. Rigidly attached to the lower end of the bar thermosatic element 65 is a rod-,65, having a horizontal crank 61 at its free end, carrying a roller 68,- arranged in advance of the upstanding crank 59 and in a position to engagetherewith.: At'its'upper end,

the thermostatic element 65 is rigidly connected with an arm 69, which is forked and has pivotal connection with a block 18, in turn having a screw-threaded opening for receiving the screwthreaded portion 1I of an adjusting rod 12. This adjusting rod is rotatably mounted within an opening formed in a bracket 13,- rigidly attached to the vertical supporting strip 62. The rod 12 is provided with' collars 14, clamped thereto for holding the rod 12 against longi- 'tudinal movement. The rod 12 extends to the exterior of lthe jacket 31 and is provided with a knob 15', for turning the same. It is thus apparent that by turning the rod 12 'the starting angular 'position' of the thermostatic element 65A may be selected and the thermostatic element will thereafter be held in the selected position.

The vertical supporting strip 62 is provided near its lower end with horizontal apertured ears 15, to receive a verticalreciprocatory indicator rod 16, provided at its lower end with a cam 11, arranged above and contacting with the pin'6l. Rigidly attached to the upper end of the reciprocatory rod 16 is a connecting link 18, pivotally connected at 19 .with a segmental gear 80, mounted upon a iixed pivot 8|. The rod 16 is sumciently resilient to permitv the same to move laterally, due to the turning movement of the segmental gear 80. This segmental gear is in permanent mesh with a smaller gear 82, mounted upon a rock-shaft 83, supported by the strip 62. An indicator disk 84 is rigidly mounted upon the rock-shaft 83 and is provided with designations 85, indicating that the damper 49 is opened or closed, or partly so. A stationary pointer 86 is arranged to cooperate with the scale or indications 85. The indicator disk isrpreferably provided with a radially extending weight 81.

The operation of the second form of my invention is as follows:

With the thermostatic bar element65 in the adjusted position shown, and the valve or damper 49 gravitates to the vertical open position, air is admitted to the ashl pit, and the coal or other fuel is burning. As the stove heats up, the bar thermostatic element 65 is bowed inwardly drawing rod 66 inwardly so that roller 68 engages the upstanding crank 59 and swings it inwardly.

This crank 59 then turns the rock-shaft 56' counter-clockwise, Figures 9 and 11, turning rock-shaft 53 counter-clockwise.. This rockshaft swings the crank 54 toward the valve or damper 49 and the valve or damper is movedv toward the opening 48-to cover the same in whole or in part. When the damper 49 is in the vertical open position, the indicator disk 84 is poturns the segmental gear 80, which turns thegear 82 in an opposite direction, and the indicator disk 84 is turned to cause the C to travel toward the pointer 86, indicating that the damper is closed in part or in whole. Particular attention is called to the fact that the vertical crank 59 contacts with.the roller 68 but is not connected therewith. When it is desired to have accesss to the ash pit, the door 40 may be swung to the open position, and the crank 59 will be swung from the roller 68. The door may therefore be opened without disturbing the bar thermostatic element.

, In both forms of the'invention the valve or damper is carried by a hinged or pivoted cap or door. The valve or damper is'self-opening and gravitates to a vertical open position. This is the preferred arrangement but it could be opened by means of a spring instead of gravity, if desired. In both forms of the invention the bar thermostatic element serves to close the valve or damper but is not connected therewith and the cap. or damper may be swung to the open position without disturbing the bar thermostatic element.

It is to be understood that the forms'of my invention herewith shown and described are to be taken as preferred examples of the same and that various changes in the shape, size, and arrangement of parts may be resorted to Without departing from the spirit of my invention or the scope of the subjoined claims.

Having thus described by invention, what I claim is:

' 1. A stove comprising a casingprovided with an outlet for the products of combustion, an air inlet collar connected with the casing, a cap pivotally mounted at its upper end upon the collar and vertically inclined in an upward direction toward the casing when in the closed position, a valve arranged upon the inner side ofthe cap and pivotally mounted near its upper end upon the cap to move from the inclined cap by gravity, and a solid thermostatic bar element arranged in proximity to the casing and having a part to contact with the valve to swing the same toward the cap for cutting off the supply of air, the thermostatic bar element and the valve being separable so that ,'the valve moves upwardly with the cap and with relation to the thermostatic bar element when the cap is swung upwardly.

2. A stove comprising a casing provided with an outlet for the products of combustion, an air a valve arranged upon the inner side .of the cap and pivotally mounted at its upper end to the cap; the valve moving toward a vertical position by-the action of gravity to become spaced from the cap, and a thermostatic bar arranged adjacent to the casing and having a part extending into the collar to engage with the valve to swing the same toward the cap.

3. A stove comprising a casing provided with an outlet for the products of combustion, an air inlet collar arranged -exteriorly of the casing and attached thereto, a cap mounted upon the outer end of the collar and inclined vertically in an upward direction toward theV casing and having an air inlet opening, a valve arranged within the collar and upon the inner side of the cap and vpivotally supported at its upper end to swing by gravity toward a vertical position to become spaced from the cap, and a thermostatic rod supported near the casing and projecting into the collar. and having a part engaging the pivoted valve to swing the valve toward the inclined cap.

44. A stove comprising a casing having an outlet for products of combustion, an air inlet collar mounted upon the exterior of the casing, a cap mounted upon the outer .end'of the collar and inclined upwardly toward the casing, a valve pivotally supported at its top to move by gravity 'the cap, a substantially vertical thermostatic bar arranged near and above the collar and -having a part arranged to engage with the valve and swing the valve toward the cap, means to pivotally sup- .toward a vertical position to become spaced from l port the thermostatic bar at its upper end, and means to angularly adjust the bar and hold the same at the selected adjusted position.

5. A stove comprising a casing having an outlet for the products of combustion, a horizontally swinging door connected with the casing and having an air inlet, a self-opening damper pivotally mounted upon the door to control the passage of air through the opening, a rock-shaft mounted upon the horizontally swinging door for moving the damper toward the closed position and having a crank, a thermostatic bar supported near the casing, a rod connected with the thermostatic bar and having a part to contact with the crank and being free from connection therewith, the part being arranged upon that side of the crank which is forwardly of the direction of movement when the crank is moved inwardly due to the opening of the door so that the crank and the part are separated when the door is opened.

6. A stove comprising a casing having an outv let for the products of combustion, a horizontally swingingl door connected with the casing and having an air inlet, a self-opening damper mounted upon the door to control the passage of air through the opening, a generally horizontalv rockshaft mounted upon the door for moving the damper toward the closed position and having a crank, a thermostatic bar supported near the ca'sing, a rod connected with the thermostatic bar and having a part to contact with the crank and being disposed upon the outer side of the crank so that the crank is separated from the part when it is moved inwardly due to the opening movement of the door.

'1. A stove comprising a casing having an outlet for products of combustion, a horizontally swinging door connected with -the casing and having an air inlet, a damper mounted upon the door to control the passage of air through the opening, a generally horizontal rock-shaft mounted upon the door for operating the damper and having a crank, the crank moving inwardly when the door is opened, a thermostatic bar mounted havlngan air inlet opening, aY movable damper mounted upon the door to control the passage' of air through the opening, aA generally horizontal rock-shaft mounted upon the door and serving to operate the damper, said rock-shaft having a 5 from the part by the opening movement of the 10 door, and an indicator device operated by the rock-shaft.

9. A stove comprising a casing having an outlet for the products of combustion, a horizontally swinging door for the casing having an air inlet opening, a. movable damper for controlling the passage of air through the opening, a generally horizontall rock-shaft mounted upon the door and serving to move the damper, a generally vertical thermostatic bar arranged near the casing, a rod connected with the thermostatic bar, means effecting an operative connection between the rod and rock-shaft, means to pivotally support the thermostatic bar, and means to angularly adjust the thermostatic bar.

l0. A stove comprising a casing having an outlet for products of combustion a horizontally swinging door having an air inlet opening, a damper to control the passage of air through the opening, a rock-shaft mounted upon the door and serving to operate the damper, a thermostatic bar supported separate from the door and arranged near the casing, means operated by the thermostatic bar to turn the rock-shaft, an indicator,

and means operated by the rock-shaft to actuate the indicator. y

1l. A stove comprising a casing having an outlet for the products of combustion, an air inlet collar mounted upon the exterior of the casing, a member carried by the collar and extending across the bore of the collar, said member having an air inlet opening, said member `being vertically incli`ned in an upward direction toward the casing, a valve arranged within the collar upon the inner side of the member and pivotally mounted at its upper end upon the member, the valve moving inwardly to a vertical position by the action of' gravity to become spaced from the member to un' cover the opening,l a thermostatic bar arranged adjacent to the casing, and a device operated by the thermostatic bar, said device extending into the collar behind the valve. and contacting with the inner face of the valve to swing the same outwardly toward said member.

MAXCY LEE BROGDEN.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2437878 *Jun 7, 1943Mar 16, 1948Sears Roebuck & CoThermostatic damper control
US2470533 *Mar 7, 1945May 17, 1949Thomas Albert GAutomatic stove
US2864358 *Jun 30, 1954Dec 16, 1958 Door mounted down draft flue for wood burning stoves
US2902990 *May 20, 1957Sep 8, 1959Baskin Jeff DMeans for protecting crops from frost and cold
US4240403 *Oct 20, 1978Dec 23, 1980Bader Bill BFireplace stove
US4274393 *Jul 20, 1979Jun 23, 1981R. Scaran, Inc.Fireplace assembly
US4457294 *May 13, 1982Jul 3, 1984Cumpston Edward HInlet air control for stove or furnace
US4461275 *Oct 26, 1981Jul 24, 1984Lucas Charles DApparatus and method for burning wood
US7513248 *Aug 9, 2004Apr 7, 2009General Electric CompanyAppliance exhaust duct cover and method of assembling same
US20060027231 *Aug 9, 2004Feb 9, 2006Ng Chang CAppliance exhaust duct cover and method of assembling same