US588492A - Chimney-cowl - Google Patents

Description

I (No Model.)

P. W. SIMMONS.

GHIMNEY GOWL.

No. 588,492. I Patented Aug. 1?, 1897.

IN VENT EFF. fwmm wwm ing to Fig. 1, but with two of the vanes sub-.

UNITE STATES;

PATENT OF ICE.

FREEMAN W. SIMMONS, OF CLEVELAND, OHIO.

CHIMNEY-CQWl...

SPECIFICATION forming part/of Letters Patent No. 588,492, dated August 17, 1897. Application filed January 7,1897. Serial to. 618.272. im r) To all whom. it may concern:

Be it known that I, FREEMANNVSIMMONS,

a citizen of the United States, residing at Cleveland, in the county of Ouyahoga and known as chimney-cowls; and the invention consists in a chimney-cowl constructed substantially as shown and described, and particularly pointed out in the claims.

In the accompanying drawings, forming part of this specification, Figure l is a perspective view of a chimney top or extension andacowl surmounting the same embodying myinvention in one of several practical forms and with all the vanes open. Fig. 2 is a perspective view of the construction correspondstantially closed. Fig. 3is a perspective elevation of a modified construction as compared with Fig. 1 and in which the vanes are rigid with the chimney extension instead of pivoted thereon and connected with which are other top, fine, or extension, as already described,

ing its triangular cross-section, thereby exposing sharp angles and sharply-retreating sides to the Wind and providing a suitable passage within. The present construction may be considered as of metal, galvanized iron serving a goodlpu'rpose. This base for the cowl proper is the same in all constructions, and by reason especially of its shape coacts with the cowl in carrying out the functions of the invention.

Referring now to Figs. 1 and 2, I'have the same parts present but in somewhat different relations. Thus in Fig. 1 are shown three several triangular vanes or wings a, b, and c, pivotally supported along the edges of the three several sides 1, 2, and 3 of the base A. Almost any suitable pivot or hinge connection of these vanes may be employed, and each vane is provided with its own counterbalance or weight, located in this instance at one end of the vane, and, as shown here, comprising a right-angled projection 4 with a nut 5 adjustable thereon and serving as a movable counterbalance to make the vanes more or less sensitive to wind disturbances. Ordinarily, or even when there is a fair movement of air, itis' found advantageous to keep the vanes open, as. in Fig. 1, but when thehowever, should the closing be sufficient to make any material difference in the size of the smoke-outlet or so as to choke the outlet. This effect or result, however, is averted in part by reason of my novel construction and arrangement of vanes. It will be noticed that when they close they close toward each other and the center of draft, and at the same time assume aninclined position. This forms upward-glancin g surfaces for the wind, which stimulates the draft. Then to avoid an eddy or dead-space behind the closed vanes Iso construct and arrange the vanes in respect to space between the vanes, when it tapers, as

in this case, with great advantage in clearing the top of the-chimney of smokeand promoting a healthy draft back to the fire. A suitable stop should be provided for limiting the inward movement of the vanes. The direc tion of the wind will of course determine which of the vanes will be closed, and experience has shown that it rarely occurs that one vane alone will be pressed down while the other two remain open. In fact there is liable to be a play of the vanes between the extremes of their positions if the wind is unsteady or changing, or insufiicient to overcome the counterweights, but in all cases they are found to respond with sufiicient promptness and fullness to meet the varying situations. This is true even if the two vanes aifected close to diiferent extents and more or less in proportion to the pressure upon them.

In Fig. I show a modification of the invention in which the vanes or upward'projections g are rigid with the base A and therefore are stationary. They, however, retain the'triaugular shape with thepoints atthe top, and they may be more or less inclined inward or outward, but an inward inclination is better, if it does not unduly choke the smoke-passage. Then in the angles or corners of the vanes g are arranged angular and pointed deflectors h, which are constructed on the same general principle as the vanes, and are largest at'their base and taper along both edges toward the top 'or point of the projection. In this case I rely with special stress on the triangular principle to control the air-currents, and find that though there is no movable part subject to the wind and adapted to close against its action there is perfect clearance of smoke and a healthy draft under all circumstances. In this case, as well as in Fig. 1 and in modifications or forms of the device, I employ a hood H of triangular plan view corresponding to the outlines of base part A and having, preferof the vanes. These hoods are supported by suitable rods 01'- posts m at the corners of the base A. The hood is of course more especially intended to protect the chimney from downcurrents as are liable to occur where chimney-tops are beneath the level of adja cent buildings as well as from other causes, but they also serve a useful purpose in conjunction with the vanes whether pivoted or fixed.

What I claim as new, and desire to secure by Letters Patent, is

1. In chimneys, a triangular top and a triangular upward projection surmounting each side of the top, substantially as described.

2. A chimney-top triangular in cross-section on its outside and a triangular projection on each side of the top forming acoutinuation of the sides thereof, substantially as described.

3. A three-sided chimney-top and a flat triangular upward projection on each of the sides of the top and on a plane substantially with the outside thereof, substantially as described.

4:. Athrec-sided chimney-top, three several triangular vanes s'urmouuting said top and a triangular hood over the top and vanes,

' described.

VVituess my hand to the foregoing specification this 225th day of December, 1896.

? FREEMAN NV. SIMMONS.

\Vitnesses: H. T. FISHER, R. B. MOSER.

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