Camp stoves -- Design and construction
Portable camp stove, wherein solid-fuel, especially of dried tree and bush twigs, is burned upon a supporting fuel grate positioned at bottom of a combustion-chamber. Solid-fuel is added directly into the combustion-chamber during operation through alligned stoke holes in a chimney and a vented-fire-ring, and then dropped vertically downward through an exhaust vent. Air for primary combustion is drawn into the combustion-chamber through a ring of intake apertures adjacent to and above the stove's bottom plate. Stove's outer wall is spaced apart from the wall of the combustion-chamber and the two walls are joined together and sealed by a top plate, creating an adjacent confining airspace. Air enters into said airspace through a ring of secondary air intake apertures in stove's outer-wall. where it is heated by thermal communication, as heat emitted from combusting solid-fuel passes through the combustion-chamber wall. As air in confining airspace is heated, it expands and rises, and creates an environment of positive pressure. Thusly, heated air is propelled through a ring of aperture jets cut through the wall of the combustion-chamber. where said heated air mixes in the inner combustion-chamber with gases released and sent ascending with solid fuel combusting on the fuel grate. The stream of heated air, propelled directly into and mixing with ascending gases, induces a dramatic reignition of said gases. The heat and flames released first by combusted fuel and then by the reignited gases, can be focused on heating contents in a cook pot. Two cook pots joined together at rims encase stove for storage and transport.
Hall, John Battaile. Portable wood burning camp stove, United States Patent US 5,842,463, issued June 14, 1996