US1142894A - Damper. - Google Patents

Description

F. D. LEIGHTON & F. H. DRAKE.

` DAMPER. APPLICATION FILED JUNE 24. 1914.

Patented J une 15,

IcErl 'li 22 ,I '14 'l '7&6

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FIE= E THE NORRIS PETERS C0.. PHOTD-LITHO.. WASHINGTON. D. C

FRANK D. LEIGHTON AND FRANK H. BRAKE, OF MANCHESTER, NEW HAMPSHIRE.

DAMPER.

ramasse.

Specification of Letters Patent.

Patented J une 15, 191.5.

T0 all whom it may concern:

Be it known that we, FRANK D. LEIGHTON and FRANK H. Dianne, both citizens of the United States, and both residing at Manchester, in the county of Hillsboro and State of New Hampshire, have invented certain new and useful improvements in Dampers, of which the following is a specification.

This invention has reference to dampers for stoves and furnaces, and it proposes, briefly, an improved device of the character or class indicated which is mounted in such a way in the smoke flue as to normally close the same, but automatically open chimneyward upon the use of gas pressure in the fire-box. In the former position, the retention of the heated gases in the fire-box, until consumed, is insured, while the automatic opening serves to prevent both escape of gas into the cellar or other room where the heating plant is installed, and entrance of cold air into the flue.

The invention also resides in the provision of a damper box which is equipped with a device for regulating the extent of movement of the damper and which further, is so constructed as to enable it to be readily opened and cleaned.

embodiment of the invention is illustrated in the accompanying drawing, whereof Figure 1 is a side-elevation of the improved darnper and damper-box; and Figs. 2 and 3 are central, transverse and longitudinal vertical sections respectively.

As shown in said drawing, the damperbox, which is indicated generally by the numeral 5, is approximately trough-shaped in cross-section, and comprises end walls 6 and 7 and a side wall 8, the lower portion of the latter wall being rounded. The top of this box is closed by a swinging cover or lid 9 provided along its side edges with depending iianges 10, and along one endwith a. spring tongue 11 that coacts with a rib or projection 12 on the adjacent box wall 7 to hold the cover in closed projection. The rear ends of the flanges 10 are connected by 'a horizontal rod 13 which passes loosely through perforations or bearing openings 14 formed in a pair of brackets 15 fastened to the box wall 6, the rod thus constituting the axis about which the cover swings.

Thetwo walls 6 and 7 are formed with annular flanges or necks 16 and 17 to which are connected the two sections 18 and 19 of the iiue, these sections leading, respectively, from the fire-box (not shown), of the stove or furnace to the damper-box, and from the latter to the chimney, (not shown), the portions of the afore-mentioned walls, inclosed within said flanges being removed, as will be understood, to permit communication of the flue sections with the interior of the damper-box.

The damper 20 is arranged within its box adjacent to the wall 6, (that is to say, the wall through which the flue section 18 opens, the said section being hereinafter termed the furnace section, to more clearly distinguish it from the section 19 on the chimney side of the box and subsequently, termed the chimney section), and is here shown as in the form ofla fiat plate having approximately the same crosssectional size and shape as the interior of the box. It is suspended at its upper end from a horizontal rod 21 to which it is securely attached in any desired manner and this rod is located a slight distance in front of the cover hinge rod 13 and is journaled adjacent its ends in openings in wall 8, the portions of the cover flanges directly opposite they rod ends being cut away to prevent interference therewith. In consequence ofk this arrangement, and

mounting, the damper will normally assumea position directly against the opening at the furnace side of the damper-box and will, therefore, serve to prevent the escape of gases from the lire-box of the stove or furnace under ordinary conditions. On the other hand, any rise in pressure of the gas in the fire-box will cause4 the damper to open, with the result that the gas will be free to pass into the damper box and thence to the chimney, without escaping into the furnace room.

To facilitate the retention of the damper normally in closed position, and, also, to control the extent of movement of the damper in one direction, one of the projecting ends of the damper-rod 21 has secured to it a bell-crank 22, one arm of which carries a weight 23. The other arm of said bellcrank is connected to a chain, rope, or other flexible element 24, which is led upwardly over a guide pulley 25 mounted in the loop 26 provided at the upper end of a strap 27, i

mentioned flexible element, to hold the latter and, consequently, the damper, in adjusted position, without, however, oliering any obstruction to the automatic chimney-ward, or opening, movement of the damper due to the gas-pressure. The free end of the flexible operating element 24; is furnished with a knob, button, or the like 29.

From the foregoing, it will be apparent that the mere application of a downward pull upon the lrnob or other handle-part 29 of the operating element 24 will result in the belle-rank 22 being rocked in a clocl wise direction, and the damper moving away from the end of the furnace section 18 of the flue, the subsequent engagement of the said element with the claw 28 serving to retain the same and, hence, the damper, in

such position. llt is to be understood, however, that this regulation or adjustment of the damper docs not interfere with its opening movement under the influence of the gas pressure, since under ordinary circumstances, (i. c., when the flexible element is either entirely free of engagement with the strap claw, or else, is engaged therewith directly adjacent the lmob or other part 29), the damper will normally assume a completely, instead et a partially closed position in contact with the inner face of wall 6. lt is to be understood, theretore, that the adjustment of the damper takes place entirely within the damper-box so that in consequence the temperature of the furnace room around the furnace is not lowered to any great extent when the damper is opened, as is the case when the damper merely controls a side, or air-inlet or opening in the damper-box. Also, the damper when in closed position, insures the retention of the gases in the fire-box, and in this way allows them to burn and holds them as a check to further consumption, instead of effecting a similar end by admitting cold air into the fire-box. Finally, the provision ot the hinged cover enables the interior of the damper-box to be cleaned, and soot removed therefrom which might otherwise bank up against the damper and obstruct its operation.

What we claim is A device of the type described, including a container arranged to be sandwiched between the sections of a heater smol{e-pipe, a damper suspended at one edge within said container, for controlling the products of combustion receiving end or said container, suspending means for said damper bearing laterally in said container, said damper suspending means being equipped with an endweighted bell-crank, a flexible member connected to said bell-crank oppositely its weighted end, a claw-like member, and a rotary guiding member, said flexible member being passed over said rotary guiding member and engaged by said claw-like member, said damper, suspending means and bell-crank all having lixed relation for simultaneous movement.

ln testimony whereof we affix our signatures in presence of two witnesses.

FRANK D. LEGHTON. FRANK H. BRAKE.

`Witnesses JOSEPH L. PooR, Giras. A. CARPENTER;

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Eatents, Washington, D. 0'.

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