US789093A - Furnace. - Google Patents

Description

No. 789,093. PATENTED MAY 2,1905.

T. E. HUNT. FURNACE.

APPLICATION FILED JULY 13, 1903.

III/I In M67170! UNTTED STATES Patented May 2, 1905.

PATENT Erica FURNACE,

SPECIFICATION forming part of Letters Patent No. 789,093, dated May 2, 1905.

Application filed July 13, 1903. Serial No. 165.411.

To all 11/71/0111, it may concern:

Be it known that I, THOMAS E. HUNT, a citizen of the United States, residing at Blue Island, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Furnaces, of which the following is a specification.

Theobject of this invention is to construct a furnace the parts of which may be readily assembled and fastened together; and the invention more particularly relates to the construction of various portions of the furnace so that the parts when combined will produce a complete furnace that is strong, compact, and durable and at the same time may be readily assembled or disassembled for the purpose of cleaning or repair.

The invention further relates to the supporting shell or casing for the fire-pot and the provision made for the purpose of cleaning the lower portion of the furnace.

Another feature of the invention is the construction and arrangement of the door-casing and the method for locking and unlocking the door and automatically operating a directdraft damper; and the invention finally consists in the features of construction and combination of parts hereinafter described and claimed.

In the drawings illustrating the invention, Figure 1 is a view showing the casing and portions of the interior structure in section and the remaining portions in elevation; Fig. 2, a sectional view of the door-casing and the door; Fig. 3, an edge view of the door and the door-casing, showing the locking mechanism therefor; Fig. l, a view of the inner or acting face of the locking-handle for regulating the door, and Fig. 5 an end edge view of the head on the locking-handle.

The furnace is constructed to have an exterior shell or casing A, having a tapered top a, provided with a hole a for the attachment of a warm-air pipe, and within the shell or casing is a heating-chamber B of substantially less diameter than the shell or casing and provided with a dome-shaped top B, riveted or otherwise secured to the walls of the heating-chamber. Within the heating-chamber is a cylindrical shell (I, within which is located a fire-pot C of any suitable construction, below which is a grate of the usual character, and at the lower rear edge of the cylindrical shell is a slot or opening 0, which is regulated or closed by means of a curved band or strip of metal 0, riveted at its ends by means of rivets c and adapted to close the slot or opening when lowered, and said band or strip is adapted to be swung up, when so desired, to expose the opening for the purpose of cleaning the rear portion of the heating-chamber. The cylindrical shell is provided in its front wall with an opening d, to which is attached alowerdoor-casing D, which opens into the interior of the furnace below the fire-pot and grate and enables ashes to be removed therefrom.

In the walls of the heating-chamber, near the top of the fire-pot is an opening a, to which is fitted a door-casing E. and said door-casing is provided with side walls a of a depth to bridge the space between the exterior shell and the heating-chamber. The casing is further provided with an inwardly-diverging top wall E and the bottom wall 0 and around the walls is a flange 0 suitably curved to contact the wall of the heating-chamber. The doorcasing is provided with a mouth F in its front, and the mouth is of a size toleave a shoulder f around the front of the door-casing, and

around the mouth is an outwardly-projecting flange f, against which the door f is adapted to abut. Exterior of the outer shell and abutting against the shoulder f is a removable plate f which surrounds the flange-mouth and secures the shell in place.

Within the heating-chamber, at the rear of the cylindrical shell which supports the firepot, is aflue G, which leads from a point near the base of the cylindrical shell to a point above the fire-pot contained therein and is open at the bottom,so that the products of combustion under ordinary circumstances will be able to travel down around the cylindrical shell and up through the flue, as shown by the arrows, in order to escape. At the upper end of the flue is an opening g through the rear wall of the heating-chamber, which opening leads into a chamber g, and said chamber is provided near its top with an opening g leading directly into the heating-chamber, so that when so desired a direct passage may be provided for the products of combustion from the fire-pot up through the heatingchamber and out into the chamber g without the necessity for passing up through the flue hitherto described. An escape-flue g leads from the chamber g to the chimney or other egress for the products of combustion. The opening g is regulated by means of a damper h, provided with a regulating-arm it at right angles to the damper, and the arm it is of suflicient weight to hold the damper closed under normal conditions, as shown in Fig. 1. To the arm is attached a chain if, which leads around to the front of the furnace and connects with a locking rod or lever I on the upper door, which locking rod or lever is provided with a series of holes din its handle for the attachment of the chain leading thereto, and the lever terminates in an enlarged pivoted head 6, provided on its inner face with flanges 6 (best shown in Fig. 4,) leaving a space or gap 71 at the end of the flange, into which a lug f*on the door may be dropped to clear the flange when the lever is turned in one position. When, however, the lever is raised, the flange will be turned sufliciently to pass over and inclose the lug on the door, locking the same, as shown in Fig. 1. As shown in Fig. 1, when the door is closed and locked the elevated position of the lever will release the chain and allow the damper h to drop; but when the door is in position to be opened, as shown in Fig. 3, the lever must be forced down, thereby exerting a tension on the chain, which raises the arm It, on the damper, opening the damper leading to the chamber g, and thereby preventing the escape of smoke and gases from the furnace when the upper door is open by providing a direct outlet automatically operated for the discharge of gases and unconsumedproducts of combustion. By this arrangement it is impossible to open the door without at the same time opening the damper, and likewise when the door is shut the damper will be simultaneously shut.

In operation the hot air and products of combustion from the lire-pot will be compelled to pass down along the, sides of the flre-pot and between the fire-pot and the walls of the heating-chamber in order to find an escape through the flue, through which they pass up still in contact with the circular wall of the heating-chamber, which is heated to a high degree. As long as the door of the furnace continues closed the products of combustion will pass out in this way. When, however, the door is opened, a direct passage will be provided, thereby preventing the escape of fumes or flames from the front of the door. In this way a maximum of safety is obtained without in any way minimizing the heating capacity of the furnace.

What I regard as new, and desire to procure by Letters Patent, is

1. In a furnace, a fire-pot, a supporting shell or casing surrounding the fire-pot, provided with a groove or crack in its lower edge, a curved ring or band pivoted at its end and extending around the interior of the supporting shell or casing, normally closing the groove or crack, and adapted to be raised to expose the groove or crack, substantially as described.

2. In a furnace, the combination of a heating-chamber, a'fire-pot within the heatingchamber, an opening leading from the chamber, adamper controlling said opening, a door opening into the heating-chamber, a casing for the door, a lever terminating in an enlarged head and pivoted to the door-casing, a lug on the edge of the door, a flange extending partially around the inner edge of the head, leaving an opening into which the lug is adapted to enter when the lever is in one position, and to be held by the flange when the lever is turned into another position for locking the door, and a connection between the damper and the lever for opening the damper by the movement of the lever when the lever is thrown into position to allow the door to be opened, substantially as described.

3. In a furnace in combination with a heating-chamber and an exterior shell, a door-casing havinga body of suflicient depth to bridge the space between the walls of the heating-' chamber and exterior shell and provided with a top wall having an upward slope toward the interior of the furnace and provided around its inner rim with outwardly-extending flanges adapted to contact the walls of the heatingchamber and further provided at its outer rim with an outwardly-extending flange of a size to leave a shoulder at its point of jointure with the body of the casing, a door fitted to said flange, and a removable exterior plate provided with an opening and adapted to inclose the forwardly-extending flange and abut against the exterior shell and against the shoulder on the door-casing, substantially as described.

4. In a furnace in combination with a heating-chamber and an exterior shell, a door-casing having a body of suflicient depth to bridge the space between the walls of the heatingchamber and exterior shell and provided around its inner rim With outwardly-extending flanges adapted to contact the walls of the heating-chamber and further provided at its outer rim With an outwardly-extending flange of a size to leave a shoulder at its point of jointure With the body of the casing, a door fitted. to said flange, and a removable exterior plate provided With an opening and adapted to inclose the forwardly-extending flange and abut against the exterior shell and against the 10 shoulder on the door-casing, substantially as described.

' THOMAS E. HUNT.

Witnesses:

WALKER BANNING, SAMUEL W. BANNING.

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