US839475A

US839475A - Chimney-cowl.

Info

Publication number: US839475A
Application number: US31652206A
Authority: US
Inventors: Hermann Gutschmidt
Original assignee: Individual
Current assignee: Individual
Priority date: 1906-05-12
Filing date: 1906-05-12
Publication date: 1906-12-25
Anticipated expiration: 1923-12-25

Description

iv 5 s NU. 839,475. IATENTBD DEC. 25, 1906.

f H. GUTSCHMIDT.

CHIMNBY COWL. Arrmonlox FILED NH12, 1906.

/wow

HERMANN GUTSCHMIDT, OF JERSEY CITY HEIGHTS, NEW JERSEY.

CHlMNEY-COWL.

Specification of Letters Patent.

Application filed May 12.1906. Serial No. 316,522.

Patented Dec. 25, 1906.

To (LN/whom, it may concern.'

Beit known that I, HERMANN Gnrscmnnr, a citizen of the United Statesof, America, and a resident of Jersey City Heights, in the county of Hudson and State of New Jersey, have invented certain new and useful Im- 'l provements in Chimney-Cowls, of which the following is a specification.

My invention relates to chimney and ventilater cowls suoli as are designed to pievent a reversal of draft in a chimney or Ventilatingflue, due to more or less downwardly-directed atmospheric current-s which might be caused, for example, by taller neighboring buildings.

My object is to produce a device of this nature that is an improvement in being at g once simple in construction and entirely efficient in operation.

W'ith this end in view I have employed as principal elements a cap I @Ver nml extending downward to DelOW the top of an extension for the chimney on the i' outside thereof and with a space between, a

hood having a small opening at the top and open at the bottom and surrounding and extending to below the cap, and a hood-shaped i ,if

The invention will be further explained by referring to the accompanying drawings, in Which- Figure 1 is a plan view of the device, and

- Fig. 2 a vertical central section, some of the lowest portion being broken away.

In the drawings, 1 is a flue portion which may be attached to and forni an extension of any w-*eiitilating-ilue or chimney to which the invention is to be applied.

Concentrict ally over the ilue 1 is the cap 2, which may be held in place by the brackets 3.

The cap 'g 2 has a conical portion 2a and a cylindrical portion 2b, and it is to be noted as of the greatest importance that the cylindrical portion 2b extends to some distance below the 'top edge of the liuc portion 1. Tests show that. if this is not done the back pressure against the draft in the flue is increased. However, this cap alone is not sufficient for the purpose. Therefore additional parts are provided, 'each one of which has been found fr l by experiment to be essential to the best results in operation.

Inside of the cap 2 and supported in any convenient manner, as by the brackets 3, is a hood-shaped pla-te 4. The plate 4 is inade up of the trunco-eonical portion 4, and the cylindrical portion 4b is parallel to the corresponding parts of the cap 2 and provides the passages 5 and 6, which form annular openings for the exit of the smoke or air from the flue 1. It is to be particularly noted that the lower edge of the part 4b of the plate 4 occupies a lower horizontal plane than the top edge of the flue 1, but not so low as the lower edge of the cap 2, also that the aperture 7 at the top of the portion 4 is of much smaller area than the fine 1. However, the space between the plate 4 and the flue 1, forming the passage 5, should throughout be equal in area to the llue 1.

Disposed outside of the cap 2 is an external hood 8, parallel to the cap 2 and forming the passage 9. cylindrical portion Sa and upper and lower truncated conical portions 8b and 8, respectively, and itis to be noted as of importance that the cylindrical portion 8 extends to bel'ow the lower edge of the part 2b of the cap 2. The lower part 8 forms a rotector around the bottoni, leaving an annu ar opening at 10. The hood S may be conveniently supported by the brackets 3. It should be 'lhe hood 8 is composed of a noted that the truncated portion 8b has only a very small opening 11 at the top, while the Y opening at 10 is large, being about equal to the passage 5 or to the Hue 1, thus allowing free egress of smoke and air at this point. The part 8c has a gentle inward slope to avoid a sharp turn at the end of the passage 9.

Normally in a chimney or Ventilatingiue-that is, when there are no interfering atmospheric currentsthe most of the smoke or air from the liuc 1 will pass downward and out at the opening 10; but a small quantity will escape through the opening 11. A. straight horizontal wind by blowing across the o ,enings 11 at the top and 10 at the bottoni lIias the etl'ect, about the same as in an unprotected chimney, to somewhat increase the draft on the principle used in an atomizer. Should the wind come at a downward angle or vertically downward, the most of it will be simply turned aside, but a small amount of it will enter at the opening 11 into the upper end of the passage 9 and pass out IOO IIO

l l F i i' l v at the lower end thereof, carrying along with f to a chimney, an imperforate cap over said it the smoke or air coming from the passage 6 and which in turn acts likewise upon that 1 which is emerging by the opening 5 from the flue 1. The opening 11 should be small, (about in the proportion shown,) for if it be large it has been found that downward aircurrents cause too strong a draft in the flue 1. However, it should be present to give a slight assistance and to counteract the opposite effect of any eddies which might be formed in- I It is to be i the lower part of the hood 8. noted that the downward clurent of air from the passage 9 does not blow across the mouth of the opening 5 nor of the passage 6, but that I it is injected downward into the streams issuing therefrom, being deflected inwardly by the part 8C, the entire mixture inally having exit at the opening 10. The principle appears to be similar to that of the injector and to produce a siphoning ell'ect in the passage 6, which draws from the flue 1 through the aperttue 7. The aperture 7 must be smaller than the flue 1 about in the proportion shown, so as to properly divide the smoke or air issuing fromthe flue 1, causing most of it to pass through the opening 5, but providing also additional means of escape and adequately supplying the passage 6. The device has been found less eflicient without the plate 4. Should the wind strike at an upward angle, it is turned aside by the outside of the protector 8c on the side from which the wind is coming and at the other side what enters is caught by the inside surface of 8C and deflected upward through the passage 9, and what does not find its way out by the aperture 11 will return along the opposite side of the hood and there be of assistance instead of harmful. l t is prevented from being deflected into the flue 1 bythe cap 2 and the plate 4. However, irrespective of any theories as to just how or why the device of the invention has been found to be absolutely effective in fullsized operative devices in use it has also been found by experiment that none of the parts shown and described can be dispensed with.

The invention of course might be modified in minor particulars without departing from the essentials thereof; but the scope of the invention is attended to in the annexed claims.

The materials to be used in construction and the manner of cutting andoining them together to form the complete evice are familiar' to those versed in the art and need not bel detailed here.

I claim as my invention- 1. A chimney-cowl consisting of the combination of a flue forforming a continuation from said cap and flue and spaced from and extending downward on the outside of said flue with its lower edge in a horizontal plane below the top of said flue, a plate spaced from the inside of said cap and from the outside of said flue and having a central opening over said flue and said plate extending downwardly below the upper edge of said flue but not so low as the lower edge of said cap, and a hood spaced outward from said cap and having a central opening at its top and open at its bottoni and extending downward below the lower edge of said cap.

2. A chimney-cowl consisting of the combination of a flue for forming a continuation to a chimney, an imperforate conical cap over said flue, said cap having a lower vertical portion extending down on the outside of said flue to below the top thereof and spaced therefrom, a plate within said cap, said plate having a vertical cylindrical portion extending downward below the upper edge ol said fiue but not so low as the lower edge of said cap, and an upper portion extending inwardly in the form of a truncated cone, leaving an opening at the top smaller than said flue, all portions being parallel to and spaced spaced outwardly from said flue so as to leave an area equal to said flue, a hood surrounding said cap, said hood having a middle cylindrical portion extending downward to below the lower edge of said cap, and upper and lower portions extending inwardly in the form of truncated cones, caving an opening at the top smaller than said flue, the said middle and upper portions being parallel to and spaced from said cap, and supports for retaining said cap, plate and hood in place upon said flue.

3. In a chimney-cowl, the combination of a fine, a cap over said flue and extending to below the top thereof on the outside thereof, a hood open at the top and bottom and surrounding said cap and extending to below said cap, and a plate within said cap and extending from above to below the top of said flue.

4. In a chimney-cowl the combination of a flue having its end open, and guides forming an unbroken passage for the wind from above to below the open end of said flue on the outside thereof, and also forming unbroken passages for the flue contents from within said flue to below the open end thereof.

HERMANN GUTseinuD'r. [n s.]