US93675A - Improvement in hot-air furnaces - Google Patents

Description

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Letters Patent No. 93,675, dated August 17, 1869.

MPROVEMENT IN HCT-AIR FURNACES The Schedule referred to these Letters-Patent and making part of the sam'e.

To all whom it may concern.'

Be it known that I, Josnrn E. CHAPMAN, of Gannon Falls, in the county of Goodhue, and State of Minnesota, have invented a new and useful Improvement in Hot-Air Furnaces; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the 'ait to make and use the saine, reference being had to the accompanying drawings, forming part of this specification.

This invention relates to a furnace for heating air for warming buildings, or for other purposes, and consists in the arrangement of air-dues in the furnace 'or fire-box, and also in the hot-air vdrum or radiator, and also in the method of preventing the radiation of` heat from the furnace-walls, and from vthe casing thereof,l

as will be hereinafter more fully described.

In the accompanying sheet of drawingsd Figurel represents a sectional side'elevation, showing the position of the air-tubes in the fire-box', and the forni of the radiator with the tubes therein, the section being through the line :n a: of iig. 2.

Figure 2 isa cross-section of hg. l, through the line y y.

Similar letters of reference indicate corresponding parts.

A is the jacket or casing by which the furnace is surrounded. Y

rIhisis covered on the outside with a coating of plaster of Iaris, B, to prevent the radiation of heat therefrom. l

C represents the walls of the furnace, the outer sides of which are also protected by a coating of plas-- front end of the furnace with the space J at the back end. l

It will be seen that these air-tubes are exposed to the direct action of the ire, but as there is a current of air from -the outside constantly passing through them, the heat will not be so intense as to injure them, but should the sides most exposed bec-ome injured, they ina-y be turnedover or renewed, and be replaced with others without difiiculty.

The radiator G is formed of two chambers, K andv L, connected together by four (more or less) large tubes, fm., through which air-tubes 1L pass, also connecting th e front air-space' e with the space J, as before stated.

The smoke and gaseous products of -combustion pass up through the connection H, into the chamber L and around the tubes n, and are discharged through the iiue O.

"he air which enters from the top at P, and also that which passes through the tubesl I and n, is discharged frorn the central aperture It, and distributed therefrom, as may be desired.

S represents a damper, by closing which the heated products-of combustion are thrown through all the tubes m. v

Ihe furnace may be made of either sheet or 'castiron, and the parts may be secured together in any suitable and substantial manner.y

Having thus described my invention, g

I claim as new, and ydesire to secure `by Letters Patent- 1. Protecting the walls O of a hot-air furnace and the ,casing A by a vcoating of pla-stervof Paris, or its equivalent', substantially as and for the purposes de-v scribed.

2. The combination, in ahot-air furnace, of the ire.

box F, with lits tubes I and the radiator G, with its tubes m and -n arranged substantially as described.

JOSEPH E. CHAPMAN. IVitnesses:

WILLIAM P. Tannen, E. ELLswonfrH.

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