Abstract: A stove construction including a firebox that defines a combustion chamber. Air is supplied to the upper portion of the combustion chamber through a preheat manifold having outlet apertures spaced along the sides. Air is drawn from the atmosphere into the manifold where it is preheated and discharged in the form of jets toward the sloping side walls of the firebox and into the flow path of the waste gases of combustion. Due to the restriction to flow caused by baffles located in the spaces between the sides of the manifold and the sloping sidewalls, a portion of the mixture of air and waste gases is directed downwardly along the surface of combustion plates, which are spaced from the walls of the firebox, back toward the primary combustion area. The waste gases are further combusted as they pass downwardly along the heated combustion plates. The recirculation achieves complete combustion of the waste gases.

Abstract: A stove burner includes heating elements lying on a concave surface when viewed from above so that elements closer to the central portion are at a greater depth than elements towards the outer portion. The heating elements may constitute concentric pipes of decreasing radii when viewed in plan and at successively greater depths from the surface of the stove when viewed in elevation so as to define the concave surface. Alternatively, the heating elements may constitute an electrical resistance element following a spiral path wherein successive spirals are at increasing levels from the top surface of the stove when viewed from the side. The radius of curvature of the concave heating element configuration is made to match substantially the radius of curvature of the bottom surface of a wok (shallow steel pan with handles).

Abstract: A portable heater comprising a housing composed of separate parts including a lower part having a bottom and side wall portions defining a trough, components of said heater including a combustion chamber assembly and a support, said support positioning in a sense transverse to said lower part, said combustion chamber assembly and said support having in connection therewith means for seating to and interfitting with means in connection with said side wall portions of said lower part in a drop fit thereof to said lower part, said support mounting thereon a motor and a fan blade assembly for powering said heater and developing therein a pressured flow of air to and about said combustion chamber assembly and means for delivering fuel and igniting the fuel in delivery thereof to the combustion chamber of said assembly, said interfitting means being constructed and arranged to position said combustion chamber assembly and said support and said fan blade assembly in a substantially direct alignment on and within sai

Abstract: An apparatus and method are provided for removing deposits from material such as drill pipe by subjecting such material to extremely high temperatures in a flame fired furnace. Heated air passing over the material carries with it the volatized deposits and is recirculated within the furnace. As the deposit laden air is recirculated to the burner, the deposits are burned in the flame, thus substantially eliminating the exhaust of contaminants into the surrounding atmosphere.

Abstract: A wood heater having an elongated cylindrical firebox with a door access at one end. A secondary heat chamber is located on a top side of the firebox, interconnecting the firebox to a flue adapter ring. Hot combustion gases are directed from the firebox through the second heat chamber to the flue adapter ring. A heat exchanger is positioned above the firebox within the heat chamber to extract heat from the burning gases and to direct the heat outwardly of the firebox and into the adjacent room. A window case protrudes from one side of the firebox and includes a glass pane for viewing the fire. The window case includes a shutter plate assembly that selectively closes off the fire from view through the window. The shutter plate has the additional function of directing ventilation air from the window vent aperture to cool the glass within the window case, protecting the glass pane from excessive heat, and preventing build-up of soot along the inwardly exposed surface thereof.

Abstract: A forced air heater for heating a venting air stream including an outer casing, a fan for forcing the venting air stream through the casing, a combustion drum providing a combustion chamber for a burner supported within the casing, a flue gas header spaced downstream from the drum connected in separate fluid communication with the combustion chamber to accommodate evacuation of combustion gases from the chamber through the header, a passage for the venting air stream extending through the casing in heat transfer relation with the drum and header, and a plurality of vanes secured within the casing adapted to circulate a predetermined portion of the venting air stream between said drum and header.

Abstract: Forced hot air alimentary oven comprises an insulated housing, vertically extending chambers situated at opposite sides of the housing, a plurality of parallel, superposed cooking compartments extending horizontally across the housing, heating elements, and a motor-driven fan for forcing the heated air throughout the housing. Relatively long and narrow passageways are defined between the open upper end of each compartment and the base of the compartment located thereabove. Pairs of spaced lips at opposite ends of each passageway act as entrance, and exit, apertures for facilitating communication between the chambers and the cooking compartments. The lips create a stream, or first zone, of rapidly moving laminarly flowing heated air that heats the food products in the superior compartment; a second, larger zone of slower moving air is utilized to heat the food products in the lower compartment. The two zoned hot air flow cooks foods with differing moisture content, such as fruit pies, evenly and thoroughly.

Abstract: An oil stove for burning both waste oil and heating oil has a primary combustion chamber for the initial combustion of fuel and an adjoining secondary combustion chamber of larger diameter in which combustion is completed. The two chambers are located in a housing and a fan is arranged at the bottom of the housing for delivering air to the inside of the housing. The air is warmed by its passage between the walls of the housing and the primary and secondary combustion chambers and is discharged for heating purposes via louvres at the top of the housing.The primary combustion chamber is defined by a pot having air inlet openings in its sidewall, a substantially closed base, a burner ring located towards the upper end of the pot and a closed jacket surrounding the pot spaced from said sidewall. In operation a pool of fuel is formed at the base of the pot and a part of the fan delivery is ducted to the space between the closed jacket and the pot and supplying air for the combustion process.

Abstract: A device for automatically dropping logs at a predetermined time for charging a fire laid on the bottom of a woodburning stove. The device includes a pair of elongated arcuate shaped log supporting members each of which is journaled within the stove adjacent a respective top side corner thereof. A latching system is connected to the log supporting member for releasably maintaining the log supporting members in a substantially horizontal supporting position. An electrically operated movable member is connected to the latching system for releasing the latching system upon being energized under control of a timing device at a predetermined time. As a result, the stove can be automatically charged during the middle of the night ensuring a fire in the morning.

Abstract: A stove ash retaining device is disclosed for use with stoves and furnaces having an ash pit which serves as the combustion chamber also simultaneously. The retaining apparatus includes a housing having a floor, sidewalls, a top and an end to define an open end thereof adapted to admit ashes therethrough. The open end includes a cover movably positionable extending thereover to prevent the moving of light ash therefrom during disposal of ashes. The housing includes an inclined entry ramp extending downwardly therefrom adapted to extend into an ash pit over the edge of an ash door of a conventionally configured stove. The apparatus further includes a tool device including a rake for separating the ashes from the coals and a hoe for pulling the separated ash up the inclined entry ramp into the retaining chamber therefore defined by the housing.

Abstract: A smoke detector testing device includes a housing, an impeller rotatably mounted in the housing, and means for rotating the impeller. The housing has a port opening into the housing for receiving the unlit end of a cigarette and an elongated hollow tube extending from the housing for discharging smoke therefrom when the impeller is operated thereby to project smoke to a remote location adjacent a smoke detector mounted on the ceiling of a room or the like.

Abstract: In an air heater, an initial group of passes on the airside is arranged in the form of a package wherein the passes consisting of banks of tubes are connected in parallel with the uptake gases.The passes of the package are located predominantly at the same horizontal level, are made of tubes of the same length and run in a zone of the same gas temperatures which is dangerous insofar as corrosion can be provoked therein.The width of the packaged passes progressively increases directly with the increase in the rates of air flow through the passes, and a feeding air duct admitting the last inflow of cold air is connected downstream of the last and widest pass to the connecting air duct serving the rest of the passes of the air heater.In an apparatus like this one, assembled from standard components, minimum overall dimensions and low weight are combined with high thermal efficiency.

Abstract: The invention provides a plural chamber gas burner for a cooking grill. The burner has an inside space between a top and a bottom. Divider walls divide the inside space into a breather space between two independently operable gas chambers. Breather apertures in the bottom of the burner provide communication between the breather space and the outside of the burner. Ignition apertures are provided in the divider walls near burner apertures in the gas chambers so that gas from an already operating gas chamber will ignite gas of another gas chamber.

Abstract: A system of wood combustion employing forced draft is disclosed and comprises a forced draft air and flue arrangement which is utilized with a typical wood heater or wood stove. The forced air and flue arrangement includes a blower, a plenum on which the blower is attached, a panel to which the plenum is attached having air inlets formed therethrough, the air inlets being internal to the plenum, and a flue arrangement attached to the other side of the panel. The flue arrangement includes ducts leading from the air inlets, the ducts having air nozzle slits formed on the other end thereof which are communicable with the internal portions of the wood heater or wood stove. Forced air from the blower enters the combustion chamber through the air nozzle slits. Immediately adjacent to the air nozzle slits and formed as a portion of the flue arrangement is an internal flue outlet for providing an exhaust exit for combustion gases, the flue outlet being communicable with an exhaust pipe.

Abstract: An oil heater comprises an oil burning section and an oil feeding system for feeding oil from a tank to the burning section. The oil feeding system includes pump means and motor means for operating the pump means. A control system of the oil feeding system consists essentially of relay means situated in a line between the motor means and electric source, combustion detecting means provided in the burning section to detect combustion of oil, and thermoresponsive switch means situated in the line between the relay means and the electric source for operating the relay means and the detecting means after combustion of oil in the burning section. The combustion detecting means is connected to the relay means to allow electric current to pass through the relay means from the electric source to the motor means only when the detecting means detects combustion of oil.

Abstract: An elastomer torsional vibration damper having a hub of low mass. The hub is preferably formed of a rigid plastic such as a phenol-formaldehyde, or of glass filled nylon. According to the invention, the hub is formed of a material having a minimum specific volume of 12 cubic inches per pound to thereby reduce the parasitic inertia of the torsional vibration damper.

Abstract: A forced air heating unit having a first U-shaped air channel with inlet vents adjacent the front, and a second U-shaped forced air channel interior said first forced air channel communicating with the first forced air channel via an opening in the common rear wall and having exit vents adjacent the front. A fan is mounted to the rear wall having the motor exterior the forced air channels with an impeller in the common rear wall opening. A conical deflector extends from the interior wall of the second forced air channel towards said rear wall opening. A refractory floor in the firebox includes front, side and rear vertical portions with top surfaces inclined towards the respective wall. The rear and side vertical portions exceed the height of a grate or andirons positioned on the refractory floor.

Abstract: An accessory included in a manufacture of a kitchen gas stove for locking shut the gas burners and also the stove doors, the accessory including a hand controlled knob at a back of the stove, the knob turning a valve along a gas incoming pipe, and also turning levers connected to hooks that hook to inner sides of the oven doors and storage drawer therebelow.

Abstract: A woodburning stove having an inner housing and an outer housing spaced therefrom providing air passages therebetween. A blower circulates air through the air passages for absorbing heat from the walls of the housing and exhausting the heated air into the room where the stove is located. A substantially horizontal plate is spaced below the top wall of the inner housing defining an afterburner space. A duct extends between the passages extending between the two housings and the afterburner space. The duct is provided with a valve so that fresh air can be controllably applied to the afterburner space for causing combustion of gasses flowing through the afterburner space. A fresh air duct extends along the side of the stove and connects with the blower for supplying fresh air from the front of the stove to the blower.

Abstract: An operably collapsible device for suspending quantities of charcoal briquets in an inverted conical shape to facilitate rapid, even ignition.