US2673037A - Draft control foe stoves - Google Patents

Description

March 23, 1954 A w ARNOLD DRAFT CONTROL FOR STOVES 2 Sheets-Sheet 1 Filed Aug. 24, 1950 O o o o o 0 0 v INVENTOR. A RT'HUR W APNOLzD AT TURNE f March 1954 w. ARNOLD DRAFT CONTROL FOR STOVES.

2 Sheets-Sheet 2 Filed Aug. 24, 1950 "uHr ll INVEN'TOR. A PTHUIP W ARNOLD 6 A TT OR/V Patented Mar. 23, 1954 UNITED STATES PATENT OFFICE DRAFT CONTROL FOR STOVES Arthur W. Arnold, Portland, 0reg., assignor to Jessie May Arnold, Laguna Beach, Calif.

Application August 24, 1950, Serial No. 181,289

1' Claim. 1

The present invention relates to draft control for stoves, and in particular an adjustable one which is very sensitive.

A primary object of the present invention is.

the provision of an air control means that is adjustable and responsive to the slightest drafts.

Another object of the present invention is thev provision of anair control means that may be entirely closed or adjusted to any intermediate open position.

A still further object of the present invention is the provision of an air control means that is. highly efficient and one in which the maximum.

percentage of heat will be obtained from the fuel used.

A still further object of the present invention is the provision of means on the draft control means for limiting the upward movement of said draft control means.

A still further object of the present invention is the provision of a draftcontrol device having,

adjustable controls with a visible indicator so that the controls may be set to the desired position.

A still further object of the present invention is the provision of draft control means having counterbalancing means.

A still further object of the presentinvention is the provision of means for controlling and directing air into the fuel chamber of a stove.

Other and further objects of the present invention will appear in the following detailed description when studied in conjunction with the accompanying drawings, wherein:

.Figure 1 is a perspective view of the device at tached to a stove, a portion of the stove being shown fragmentary.

Figure 2 is a rear elevational view of the device. Figure 3 is a top plan view of thefiaps or wings trolling and directing air into the fuel chamber of a stove.

It is a known fact that in stoves as used today only a small part of the useful energy is recov eredwhenfuel is burned. The fault usually lies withthe air control. andasa resula much'heat is wasted and goes up the chimney. The draft. on most stoves is a fixed one and when the draftis opened to admit air to make a fire hotter, it

stays open until the room or space becomes too,

hot, then the damper is turned down, then later on more heat is needed, the damper is opened. again, and the process is repeated over and over, with a constant loss of heat and a corresponding waste of fuel. With the present invention, when the indicator is set for the desired amount of air,

the damper, flaps, wings or valves will automatically adjust themselves to a more open. or closed position as needed.

Referring to the drawings the numeral l0 represents the device and it comprises a tubular housing H having binding posts I2. At one end. of the housing there is provided a closure plate I3 and a cover plate l4, thecover plate being provided with integral ears l5 to which one end of wire 56 is connected, the opposite end ofthe wire engaging binding posts IE to secure the cover plate to the housing II. The tubular housing II is provided with a circular opening l'i thatreceives a portion of pipe E8, the top end of pipe.

[8 being disposed at an inclined angle. Encompass ng the pipe I8 is a strap I9 having right angularly disposed ears 20, each being provided with an aperture that receives a threaded bolt 2| having a nut 22 that secures the strap to pipe It, the strap serving as a support for the tubular housing I I, and also providing an adjustable means for pipe iii to lower or raise it.

Housed within the pipe I8 is a pair of semicircular air control flaps, wings or valves 23 and. 24 that are secured to, rods 25 and 26 respectively,, the ends of the rods being mounted in apertures.

in pipe l8 and freely movable. To one end of rods 25 and 25 there is secured element 21 that connects with one end of. springs 28, the opposite end of the spring being provided with a weight 29, that serves as a stabilizer for the flaps, wings or valves.

The pipe 18 is provided with screw. bolts 30,

that carrya resilient element 30', the resilient; element limiting the upward movement of the flaps, wings or valves 23 and 24, so that in clos-= ing the flaps, wings or valves will not hit the bolts 30 with a crash, but will be gently closed. At

tached to the top faces of the flaps, wings or valves 23 and E i are the lowerends 3| and 32 respectively of spring elements 33 and 34, theupper en s it and 36 being connected to plate 51. The loop endtt oiangularwire 39 isconnectedto plate. 31 by a wire 40, the angular wire ,1. 39being, supportedby -a,,strap U, the ziportionufl" of the strap being secured to the housing II by bolt 43. The springs 33 and 34 provide resilient support for the flaps, wings or valves 23 and 24 and one that is very critical to the slightest movement of the flaps.

Mounted on the body II is a housing 44 that is secured to the housing by bolt 43 and a band 46, the ends of the band having apertures that engage the binding posts I2. The housing 44 is provided with closure plates 41 and 48 each of which is provided with a central aperture. The central aperture in closure plate 48 receives a threaded bolt 49 that is afiixed to the plate by nut 50. Upon the threaded shank of bolt 49 there is mounted a washer and in spaced relation from the washer is a nut 52. The space between the washer and the nut 52 is engaged by the V- shaped portion 53 of wire 54, one end of the wire being secured to the housing 44 by bolt 55, the V-shaped portion serving as a securin means for the cover plate. The cover plates 41 and 48 are further secured to the housing 44 by a Spring clip 56 that engages the band 46, the spring clip being secured by wire clip 56'.

The central aperture in cover plate 47 receives a threaded bolt 51, the shank of the bolt being of a slightly smaller diameter than the aperture allowing free rotative movement. Upon the bolt there is mounted a drum 58, resilient tensioning discs 59, washer 63, a support washer BI that is held in position by screws 52, a nut 63, an indicator arm 64 and a nut 65 holding the assembly together. On one face of the drum 58 there is secured by staples 66 the loop portion 61 of element 68, the arm portion 69 extending beyond the peripheral edge of the drum, the arm being bent downwardly at and at right angles to the arm forming a leg, the end of which engages the inner face of the cover plate 41 and serves as a means to hold the indicator arm 64 in any desired position. The outer face of cover plate 41 is provided with suitable indicia H to indicate when the indicator arm 64 is moved to a selected point,

the exact position of the flaps, wings or valves 23 and 24.

Within the housing 44 is an element 12 having one end formed into a loop !4 that engages a bolt that secures the element to the housing. Encompassing a portion of the element 12 is an open spring 16, and through this spring passes a wire 71 having one end secured to loop portion 61 of element 68, the wire passing through tube I8 and aperture 19, the end 80 being connected to loop 8| of the angular wire 39. During movement of wire 11, spring element 16 will move slightly on element 12. The roof of the pipe H is provided with a reinforcing member 82 that is secured by bolt 43.

-In one end of the tubular housing ll there is mounted a disc 85 having a plurality of apertures 86 as 'a means for controlling and directing air into the fuel chamber of a stove.

In the operation of the present device, the device is attached to any stove, a portion of the housing I I engaging an aperture or a flange that is below the grate level, such as is shown in Figure 1. The bottom end of a pipe I8 is positioned arm-64 is on numeral 1, the'numeralson the dial running from. 1 .to 8, the flaps, wings or. valves 23 and 24 are fully open. Counter-clockwise movement of the indicator arm turns drum 58 in the same direction, and if viewed from the rear as in Figure 5, the movement would be clockwise. Looking from the rear as in Figure 5 clockwise movement of drum 58 will impart movement to element 69 which will move wire 11 downwardly through the open spring 16, down through the tubular element 18 and aperture 19 thus transmitting its downward movement to angular wire 39, which being pivotally mounted on the bottom end of strap 4| allows the plate 31 to move down, the downward movement being assisted by the counterbalancing weights or stabilizers 23 and springs 28, 33 and 34, the flaps, wings or valves 23 and 24 moving downwardly from a horizontal position. The flaps, wings or valves 23 and 24 being pivotally mounted on rods 25 and 26, and counterbalanced by weights or stabilizers 29 will admit a certain amount of air according to the setting of the indicator arm 64.

If the indicator arm 64 is set at numeral 1 on the dial, the flaps, wings or valves 23 and 24 will be wide open, not responsive to changes in air movement, and likewise, if indicator arm 64 is set at the extreme position numeral 8 on the dial, the flaps will remain fully closed regardless of air pressure. The intermediate portions from numerals 2-7 on the dial are the ones in which the flaps, wings or valves 23 and 24 will be responsive to air movement. If the indicator arm 64 is set at 4, for example, the half way mark or 90 degrees on the dial E4, the flaps, wings or valves 23 and 24 will be approximately half way open under normal conditions, but if in this position the air becomes too strong through pipe l8, the flaps, wings or valves 23 and 24 will close up automatically until the draft of air decreases, and as the air decreases the flaps will gradually open. The delicate suspension of the flaps and the associated elements prevents too rapid burning of fuel as the closing of th flaps cuts off the air supply, thus reducin the combustion of fuel inside of a stove. From the description it can be seen that a self adjusting control is provided, that only has to be set occasionally, and when set it is self regulating. The maximum energy is derived from any fuel used in a stove equipped with the present device. With the present device any increase of draft will reduce the flame instead of creating a roaring fire such as is the case of stoves not equipped with the present device. The delicate mounting of the flaps, wings or valves make them responsive to the slightest draft,

thereby providing a device for controlling air into a stove of any desired volume.

By providing the perforated bafiie plate the volume of air is also controlled and directed into a stove due to the apertures 86 in the baffle plate or disc 85. g

While the present invention has'been disclosed in' connection with certain specific embodiments thereof, it is to be understood that these are by way of example rather than by way'of limitation,

' and that the invention is to be defined by the attendant claim which should be given a scope as broad as is consistent with the prior art.

What is claimed is:

A draft control for-stoves, comprising a vertical and a horizontal housing, combined manual control and indicator means above said horizontal housing, pressure responsive flaps pivotally mounted in said vertical housing, stop means also within said-vertical :housingto prevent upward movement of said flaps pasta horizontal plane, a'

5 wire depending from said control means, and Number separate springs rising from each flap, said wire 259,494 and said springs connected by an angular bar and 855,574 a plate, whereby movement of the control means 1,688,850 will cause a corresponding movement of said flaps. 5 1,954,125 2,272,468 ARTHUR W. ARNOLD. 2,460,538 References Cited in the file of this patent UNITED STATES PATENTS m Number Number Name Date 20,528 184,061 Butman Nov. 7, 1876 83,038

Name Date Church June 13, 1882 Henabray June 4, 1907 Calhoun Oct. 25, 1928 Gerow Apr. 10, 1934 Lange et a1. Feb. 10, 1942 Schneider Feb. 1, 1949 FOREIGN PATENTS Country Date Great Britain Sept. 2, 1910 Sweden Apr. 2, 1935

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