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Publication numberUS218596 A
Publication typeGrant
Publication dateAug 12, 1879
Filing dateFeb 26, 1879
Publication numberUS 218596 A, US 218596A, US-A-218596, US218596 A, US218596A
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Improvement in automatic dampers
US 218596 A
Abstract  available in
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Description  (OCR text may contain errors)

H. W. TABER. Automatio-Dampqr.

No. 218,596. Patented Aug. 12,1879.



a plan of the same.




Specification forming part of Letters Patent No. 218,596, dated August 12, 1879 application filed February 26, 1879.

To all whom it may concern:

Be it known that I, HARLOW W. TABER, of Roscoe, in the county of Moody and Territory of Dakota, have invented a new and Improved Automatic Damper for Furnaces, Stoves, &c., of which the following is a specification.

Figure 1. is a sectional side view of the damper in place on the Stovepipe. Fig. 2 is Fig. 3 is an end view of pipe with damper attached.

Similar letters of reference indicate corresponding parts.

This invention consists of an automatic draft and heat governor for stoves, furnaces, and the like, and is to beY-attached to the pipe, smoke-stack, or chimneyabove the furnace or stove. It also. acts automatically and inversely as aventilator when used in close or confined rooms, giving a greater amount of ventilation when the room is hottest, and clos- ,ingwhen cold.

. In the drawings, A represents the stovepipe; B,.the self-actin g damper or valve, which is hinged at a, and nearly balanced by the weightb at its projecting end, and held in position and against the currents of air tending inward by the adjustable sliding weight 0, which is supported by the arm 01, that is firmly attached to the damper on aplane with the hinge at aboutthe angle represented.

At all'times when there is no fire in the furnace or stove the sliding weight 0 will hold the damper against the stop f, so that no obstruction is'ofi'ered to the draft, and this position of the damper will be maintained until the temperature within the pipe so rarefies the air and creates such an upward draft that the pressure of the outer air upon the surface of the damper overcomes the resistance ofl'ered to the sliding weight.

As the hot air rises into the pipe or chimney from the furnace or stove it produces a partial vacuum, and whenthe rarefaction has sufficieuty decreased the atmospheric pressure within the pipe the pressure of the outer air forces the damper B open and into the chamber E, overbalancing the weight 0, and admitting'into the pipe or. chimney through the chamber a strong counter-current of colder air.

, When light and quickly-combustible fuel is used in the stove or furnace, the damper is forced even into the main pipe A, thereby partially cutting off the main draft, as well as admitting a stronger counter-current.

The adjustment of the sliding weight 0 on the arm d determines the resistance opposed bythe damper to the superior pressure of; the outer air; hence, by its adjustment, the intensity of the counter-current and of the draft and the rate of combustion in the stove or furnace are regulated.

Among the advantages which this device as a damper and ventilator possesses over all' others with which I am acquainted, the following may be mentioned:

By its use there is a great savingof fuel for heating purposes, as it retains the hot air and fills the vacuum created by it in the pipe with colder air from outside.

When it is used combustible and explosive gases never collect in the stove or pipe, as is frequently the case when the draftis entirely out off on the old principle. Controlled by this, such combustible substances as hay, straw, and shavings, when used for fuel, burn with as steady a fire and heat as more solid fuel. l

When this device is used the cold draft of air entering the pipe prevents danger from fire, both from sparks and articles coming in contact with the pipe.

The adjustable weight never gets too hot to be handled with the bare hand, and when desirable the damper can be set arbitrarily and without reference to its automatic character. j

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. In combination with the stove-pipe or chimney A, the chamber E, the damper or valve 13, weight b, and arm 61, with adjustable weight c, substantially as herein shown and describe 2. In combination with the stove-pipe or chimney A and chamber E, the automatic damper or valve B, with its connections and 3. in combination with the damper B for attachments, as herein shown and described, stove-pipes or chimneys, the permanent weight. the extent or range of whose action, when it I), arm d, and sliding Weight 0', substantially is properly adjusted, may be governed by the as and For the purpose described.

diflerence between the pressure of the ntmos- HARLOW W. TABER. phere and that of the air or gases within the Witnesses: stove-pipe or chimney. substantially as here- JOHN H. NEPERUD,

in shown and described. DAVID F. DRESSER.

Referenced by
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US2846935 *Feb 16, 1956Aug 12, 1958August J StillFlue breather
US5195927 *Aug 5, 1991Mar 23, 1993Raydot, IncorporatedAir intake apparatus for inner wall
US5570713 *Nov 7, 1994Nov 5, 1996Baracuda International CorporationFlow control weir valve
US6454247 *Dec 7, 2000Sep 24, 2002Ff Seeley Nominees Pty LtdAnti-backdraft shutter assembly for an axial flow fan
WO2003001124A1 *Jun 5, 2002Jan 3, 2003Acticon AbAir-supply device
Cooperative ClassificationF23L11/02