US1794140A - Chimney - Google Patents

Description

Feb. 24, 1-931. 1.. L. BLANCHARD CHIMNEY Filed July 26, 1929 INVENTO/i.

LESTER. L'. BLmvc/mm' Patented F eb. 24, 1931 UNITED STATES PATENT o F cE LESTER L. BLANCHARID, or DOVER-FOXGROFT, MAINE, ASSIGNOR To EENRI- CREPEAU,

or MoN'rRnAnoANADA CHIMNEY Application filed July 26,

This invention relates to chimneys, and more particularly to devices mounted on the outlet portion thereof.

The object of the invention is to provide means whereby the efiiciency of the chimney is greatly increased.

A further object is to provide means whereby the up draft is accelerated and the formation of smoke is greatly reduced.

A further object is to protect the outlet of the chimney from injurious efiects due 'to flue gases, rain, snow and ice, and to prevent condensation therein and deposits thereon.

Further objects will be set forth hereinafter.

The invention consists briefly of a lining member of heat absorbing and heat retaining material, mounted within the outlet of the chimney.

Reference is made to the accompanying drawings in which:

' Figure l is a sectional view through a brick chimney top with outlet device mounted thereon.

Figure 2 is a similar view of a metal flue 25 with the device mounted thereon.

The chimney 1 which may be constructed of any suitable material, is provided at its outlet with a lining member 2 which extends downwards into the flue a suitable distance according to the size of the chimney.

This lining member 2 is composed of a material which is heat absorbing and heat retaining, such for example as glass wool.

This lining member 2 is formed to have its inner surface tapered upwardly, whereby the size of the flue is gradually reduced to the outlet.

The inner surface of the lining member 2 i in most cases is covered by a casing 3. This casing 3 may be made of non-corrodible sheet metal.

The outer surface of the lining member 2 which is in contact with the inner surface of the chimney 1, may have a covering of asbestos board or other suitable material in order to retain the member 2 in shape, if it consists of loose or non-solid material.

The upper end of the member 2 has a conical extremity projecting above the chimney. This is preferably covered by a metal cap 30 connected to the top edge of the casing 8, which inclines outwardly to the outer edge of the chimney 1, and this cap 3 is usually provided with a dependent flange 31 which fits around the chimney top. 4

In Figure l the top of the chimney is shown squared, and a space '5 beneath the cap 30 occurs. This space 5 may be filled'up with cement or the like, to assist in providing a firm and secure setting 'for the device when installed on the chimney.

Means are provided to seal the lower edge of the member or its casing to the inner surface of the flue, in order to prevent the entrance of gas or moisture between the chimney 1' and the liningmember- 2.

The method of mounting the lining memher 2 and of retaining it in position, may be varied in order to suit the different shapes of chimneys and the particular conditions in each application, without going beyond the scope of this invention. 71th the invention constructed. as above set forth or on similar lines, its operation is as follows I The heated gasesarising from the combustion area below the chimney, on reaching the lining member will give-up a large amount of their heat to it. Vfhen the member becomes heated, it creates an increased up draft in the flue, and the combustion of the fuel in the combustion chamber will be more complete, with the result that the percentage of CO in the flue gases will be increased, while the percentage of CO which-escapes from the combustion zone will be reduced to a minimum. 7

This-increased up draft in the outlet prevents cold air from passing downwards in the chimney top and cooling the combustion gases therein, and thereby producing smoke.

The heated outlet further prevents the condensation of moist gases and the deposit of matter such as creosote on the flue wall.

The confined area of the outlet also reduces the amount of rain or snow that can enter the chimney to a minimum.

The cap or top of the member, which will also become heated will keep its surface clear of any accumulation of snow or ice.

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By means of the sealed lower edge of the device, flue gases will be prevented from penetrating between the flue wall and the outer surface of the lining member, and the wall will thus be preserved from the injurious effects of such gases.

By increasing the chimney draft and preventing back draft and the chilling of the combustion gases, great economy in fuel consumption' will be secured.

Expense charges for upkeep, cleaning and repairs will be thereby reduced to a minimum.

l/Vhat I claim is 1. In a chimney outlet device, a lining member of heat absorbing and heat retaining material, tapered upwardly, and mounted in the outlet of the chimney and secured thereto by metallic means. 4

2. In a chimney outlet device, a lining member of heat absorbing and heat retaining material, tapered upwardly and having a conical extremity projecting above the chimney, mounted in the outlet of the chimney and secured thereto metallic means.

3. In a chimney outlet device, a lining member of heat absorbing and heat retaining material, tapered upwardly and having a sheet metal casing on its inner surface, mounted in the outlet of the chimney.

i. In a chimney outlet device, a lining member-ofheat absorbing and heat retaining' material, tapered upwardly, having a sheet metal casing on its inner surface, with an outwardly inclined cap extending from its upper edge, mounted at the outlet of the chimney.

5. In a chimney outlet device, a lining member of heat absorbing and heat retaining material, tapered upwardly, having a sheet metal casing on its inner surface, with an outwardl I inclined cap extending from its upper ec ge, having a dependent flange fitting around the chimney top, mounted at the outlet oftthe chimney.

6. In a chimney outlet device, a lining member of heat absorbing and'heat retaining material, tapered upwardly and mounted in the outlet of the chimney, metallic means to secure the lining member in position and having a sealed contact withthe flue wall at its lower edge.

LESTER L. BLANCHARD.

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