US883878A - Flue-damper. - Google Patents

Description

PATENTED APR. 7, 1908.

4 F. M. HEATH.

FLUE DAMPER.

APPLICATION FILED SE21. 3. 1907.

is e specification.

5 or is. -5

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ft ift-E l T 0 (ZZZ wile m it may concern:

Be It known that 1,

lvll. citizen of the United States," resir Portland, in the county of Mnltnoi State of Gregon, have invented useful Flue-Damper,

heat generated in the stove decreases or incresses in intensity. This damper may lie sd uSted to remem in a certain position when the normal quantity oi lieet radiated from the stove or heater, out any increase or decrease of seat will correspondingly change the strength of the draft and alter the position oi the damper pistes so to bring the temperature once sgein to normal. It is Well known 'thatwlisn 'i'uel is led to the stove, especially Wood. burning stoves, heat is generated quite rs idly and. with great intensity far beyond t is requirements needed for heating a room or for cooking purposes; To obviate this, vsrions forms oil dampers have been used to reduce the quantity of-air passing through the stove.

The herein described invention is simple in construction and very responsive to any variation in the strength of the draft passing through the smoke flue, and for this reason the radiation oi heat is practically constant Wherever this damper is used.

Referring to the accompanying drawing; Figure 1 is an elevation of a portion of a stove pipe partly broken away showing clearly the damper and its connecting mechanism in full open position. Fig. 2 is e similar View of the device showing the damper fully closed and the connecting mechanism in a different position. Fig. 3 is a plan View of the arrangement of parts illustrated in Fig. 2. Fig. 4 is en elevstiono'f the damper mechanism in position shown in 2 looking in the direction or" the arrow s.

I Similar reference characters are used on. all the figures to designate the same parts.

The letter A indicates e smoke flue oi any character such as a coal cooking or, eatnig stove pipe, a furnace smoke-flue, or e for the sake of clearness and simplicity the A r-Iii. 7, invention. will be described. in'connection with on ordinary stove fiixtendnig diemetiicslly throng 1 r stove sips A and in splsne perpendicular end 2, slightly v i lioles' made in t o" to each rod by a screwlfs. semicircular piste or leaf. 3 which pr On one side of the pipe A the rods 1 and 2 have err-arm i and 5, respectively, exterior to 2. section o ether form it circular damper closing the gripe and at right angles to their respective rods. "ifire arms do not lie in the same vertical plane, the arm being at a. greater LliSbu-Ilfiw' from the pipe A than the arm 5. They are of canal length and may be slotted in tl'ieir lowci' ends for links 6 and 7', thejlink 6 being; pivoted to the arm l.

iliclr passes ed and. nut 11) mounted on 1S accomplished tnresd'ing one of the arms 1 as l and mounting thereon a, counterbalance Weight 11 which, when moved. in either direction, changes the balance of the parts. If the Weight lae moved towards the axis of the rod 1, both plates or leaves 3 will fall as they are connected to ether through the arms end 5 and the lin s 6- end 7. An opposite movement of This adjustment is desirable among other reesons for positioning the plates 3 with respect to the normal. draft or the chimney into which the stove pipe enters, some chim neys, its is Well known, have s stronger draft then otlre I v .e rod 1. ll nen e. fire is sale in e'stove provided I 'jJnSSQS under i with sneutomstic dernper'sucii as a cove do so the leaves 3 thereof will assume the common indicated in EF 1g. 1. As the fire n1- cresses, s strong'r draft will pass through Projecting" forwardly from the lower encl'oithe link 7 1s.

the counterweight T 4.2 1 i v 'overcslcnces toe pistes 3 end they will rise.

the smoke fiue, and as the temperature ap proaches the height required, the draft gradually causes the leaves 3 to swing outwardly until they reach the pointwhere their weight balances the pressure ofthe upward draft, this bein the normal position of the dampers. Shou d the heat decrease in the room, as it will through exhaustion of fuel, the dampers will fall, owing to the lessened strength of the draft, giving greater space for the passage of heated air and thus cause the fire to grow stronger. A reverse movement of the leaves from the normal, that is to say, closing themto the passage of air, will take place should something quickly combustible, such as resinous wood, or a large amount of very dry wood, coal-oil, and guinerous other articles, be thrown upon the From the above description, it will be noted that as soon as the leaves have reached their normal position, they will substantially remain-in said position with possibly a slight rise and fall as the fire changes. It will therefore be seen that the damper is automatic, keeping the stove while burning always at the same temperature and thereby effecting great saving infuel.

It is well known that in windy weather, the draft in a chimney flue is much more intense than at other times, and, therefore, on these occasions, a greater quantity of fuel is burned than at other times. But with stoves equipped with the improved automatic damper, the consumption of fuel will be no greater with an intense wind blowing than at other times.

Having-thus described the invention what is claimed is 2-- .1. An automatic damper for flues comprising a pair of plates or leaves'adapted to swingon parallel horizontally disposed rods within the flue and extending across the center of the same, each of said rods having an arm on the same side of said flue, said arms crossing, and a link pivoted to each arm and the two to each other. i

2. An automatic flue damper com rising a pair of plates or leaves fixed on para lel horizontalrods adjacent each other journaled in the walls of the flue and extending centrally across the same, an arm on each rod outside the flue, said arms being in different vertical planes and crossing each other, links pivoted to the arms and to each other to cause said leaves to vibrate in unison and close or open,

' more or less the passage through said flue.

3. An automatic flue damper com rising two semi-circular plates or leaves wit Illl the flue attached to parallel horizontal rods adj acent each other and journaled in the walls of the flue, an arm on each rod at a right angle thereto, said arms'crossing each other, flexible means connected to the ends of the arms to cause the damper plates or leaves to move in unison and preserve the ratio between the flue opening and thestrength of.

the draft therethrough and means for positively changing said ratio. 7

4. An automatic flue damper comprising two semi-circular plates or leaves within the fine and adapted to close the same, said plates or leaves attached to parallel horizontal rods adjacent each other and jo'urnaled in the walls of the flue, an arm on each rod at a right angle thereto, said arms crossing eachother, links connecting to said arms-and to each other to cause the plates or leaves to move in unison and preserve the ratio between the 'flue opening and the strength of the draft therethrough, and a counterweight adjustably mounted on one of said arms f0 positively changing said ratio.

5. An automatic flue damper comprising two semi-circular plates attached by their straight edges to two adjacent parallel rods extending horizontally through the flue, an arm on the rojecting end of each rod on the same side 0 the flue at a right angle thereto,

links attached to said arms, and a clamping screw connecting said links to each other whereby the damper leaves may move automatically or be held in fixed position.

6. An automatic damper comprising a pair of parallel horizontal rocking rods adjacent to each other extending through a flue and each having fixed thereon a damper plate or leaf, an arm on the outside end of each rod and at a right angle thereto, said arms crossing each other and one having its exterior screw threaded, a movable weight on the threaded arm, and a link extending downwardly from each arm said links being pivoted togetheri 7 An automatic damper comprising a pair of parallel horizontal rocking rods extendii'ig through a flue and a dam per p'l ate fixed to each rod within the flue and movable with it, said damper plates together forming a damper adapted to close said lluc, an arm on the outside of each rod and at a right angle thereto, said arms crossing each other, a link extending from the end of each arm, said links being pivotally joined at their lower ends, and a fastening at the joint to hold the damper leaves in any desired )osition.

In testimony that claim the foregoingas my own, I have hereto allixed my signature in the presence of two witnesses.

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