US5962A - Felix a - Google Patents

Description

FELIX A. FINN, 0E NEW YORK, N. Y.

CHIMNEY-CAP.

Specification of Letters Patent No.

To all whom 25 may concern.'

Be it known that `LFELIX A. FINN, of the city, county, and State of New York, have invented newl and useful improvements in chimney caps to prevent smoking either from the want of draft or from currents blowing down the lues of chimneys, and which may be used as a ventilator, and that the following is a full, clear, and exact description of the principle or character whichv distinguishes them from all other things before known 'and of the manner of making, constructing, or using the same, reference being had to the accompanying drawings, making part of this specification, in which- Figure l is aperspective view of my improved chimneycap, and F ig. 2 a vertical section thereof.L

The same letters indicate like parts inthe n two igures.

' Chimneys smoke from one of three causes, viz, either because the supply ofair to the room through lplaces other than the flue is not sutlicient to supply combustion and the rarification, or from external currents blowing down the chimney with a force greater than t-he upward force of the draft produced by rariication, or, because of a preponderating'upward current in some other part of the house which will draw its supply from downward currents in yanother flue or flues. The first part of'these is proved by the practice often resorted to of opening a door or window to give draft to a chimney, which will not otherwise draw. The second by the pnffs of wind descending` the chimney which often not only blow the smoke but sometimes even ashes into the room. And t-he last by making -tire in two rooms of unequal size or one having tight windows and doors and the other loose, with an open door communicating between the two, in either of which cases one chimney will draw its supply of air from the other, causing a downward current therein which prevents the smoke and other products of combustion `from rising. The object of my invention is to remedy these evils.

The first part of my invention is based on the well known fact that an upward and a downward current of air can be produced in a tube by rarification, the circulation being kept up byv the continued rarification, and consists in'using a partition at. the top of the flue, and descending to any extent desired, which partition will separate one side 5,962, dated December 12, 1848.

ofthe chimney from theI other that the v vdownward current to supply the combustion and the current produced by rarificationmay `at the start be separate, the tendency of these currents being to continue separate when once started; the partition having the effect at the same time to prevent the smoke 1 at the top of the chimney from mingling with the air that supplies the downward current; And the second part of myi'nvenf` tion consists-in providing the chimney can with apertures on t-wo oppositev sides, when combined with curved partitions so arranged that currents which blow into these apertures will be deflected upward and in passiing upward will tend, to exhaust the iiues of the chimney, or when blowing down the chimney shall be deflected and carried outv y through the side aperture instead of passing down theflue, the upward current from the tire being free at the same time to pass out without any interruption from such blasts of air.

In the accompanying drawings (a) represents a square metal chimney cap on a Chim ney flue (b). The flue in this cap is divided into two equal parts by a partition which is vertical for a shortl distance, and is then extended to the top by a double ogee curve, the upper end being then curved down to present a semi-cylindrical curve (c) at the top of the chimney cap. The two sides 0f the sovv cap which are parallel with the lower part of the partition are each made with two apertures (CZ, cZ,) and (e, 6,) provided outside with sloped flanches (f) to gather in the currents of wind, and to the lower and inner edges of each is attached a wing (g g g2 g3) curved to correspond with thecurves of the o. g. part of the middle partition so that the upper edge of the `upper one on the left hand side in the figure shall be about vertically below the turned down edge of the middle partition with space sufficient between them for the passage of the draft, that if it (the draft) should be struck by a downward current of wind the whole will y be carried out of the upper lateral aperture, and if by any possibility a portion of the draft should be carried down below this ture. The wings (g2) and (g3) of the two apertures on the rightJ side are located in a corresponding manner on the right hand side ofthe cap and have the same effect when a current blows down that sideof the cap. When a current of wind blows vinto these side apertures it is deflected and carried upward 4and passing by the apertures of the lues formed between the wings and the curved surface of the middle vpartition exhausts the flue on that side of the partition in which the currentblows, the draft on the other side being free to pass out or in as the draft in the chimney may require.

I wish it to be understood that the number of curves in the middle partition and the number of lateral openings and wings may be increased or diminished without changing the principle of my invention, although the number represented in the drawing is deemed the best. And that the first part of my invention can be used without the second and produce a good eiect in Curving the partition in manner substany tially as described, in combination with the lateral openings and wings in the sides of the chimney caps, `as described, that blasts of wind blowing in through the lateral apertures may tendrto exhaust the flue and aid the draft, and by means of which also, downward blasts of wind shall'be prevented from passing down the chimney flue as described.

FELIX A l FINN.

Witnesses: Y

ALEXR PORTER BROWN,

C. W. M. KELLER.

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