Combustible fuel burning stove with fire grate
Disclosed is a stove that includes a dome-shaped fire grate comprising a center, a perimeter surrounding and spaced from the center, the center being higher than the perimeter; a plurality of radial stiffening ribs extending away from the perimeter and toward the center; at least one circumferential stiffening ring extending at least partially about the center; and a plurality of ventilation holes between the center and the perimeter.
1. A fire pit comprising:
an outer wall comprising a plurality of air ventilation holes;
an inner wall spaced from the outer wall to form an air gap therebetween, the inner wall comprising a plurality of air ventilation holes, the inner wall defining a cavity and having a central axis;
a fire grate formed of a blank of sheet metal and disposed in the cavity, the fire grate comprising:
a lower elevation portion defining a perimeter edge;
a higher elevation portion disposed substantially at the central axis, the fire grate shaped to form an arc shape between the lower elevation portion and the higher elevation portion;
a plurality of radial stiffening ribs formed by bends in the sheet metal and extending in a direction between the lower elevation portion and the higher elevation portion;
a plurality of ventilation holes through the sheet metal between the lower elevation portion and the higher elevation portion.
2. The fire pit of claim 1 , wherein the perimeter edge of the fire grate is circular.
3. The fire pit of claim 1 , wherein the fire grate is a spherical section with a radius of curvature larger than one-half of a width of the fire grate.
4. The fire pit of claim 1 , wherein the fire grate further comprises a downward-facing lip around the perimeter.
5. The fire pit of claim 1 , wherein the plurality of radial stiffening ribs include first ribs of a first length and second ribs of a second length different than the first length.
6. The fire pit of claim 1 , wherein a portion of the fire grate comprises an outer stiffening ring that includes no ventilation holes.
7. The fire pit of claim 1 , wherein the fire grate, the plurality of radial stiffening ribs, and the ventilation holes are arranged in a manner that they can be produced by stamping the sheet metal.
8. The fire pit of claim 1 , wherein the fire grate is configured to support between 0 lb and about 190 lb of fuel at temperatures of between about −40° F. and about 1350° F.
9. The fire pit of claim 1 , wherein the inner wall comprises an upward-facing support, the perimeter edge of the fire grate resting on the upward-facing support of the inner wall.
10. A fire pit for burning solid fuel to produce heat, comprising:
an inner wall having a lower portion and an upper portion;
an outer wall having a lower portion and an upper portion;
an air-filled space between the inner wall and the outer wall;
a chimney formed by the inner wall and defining a central axis;
a combustion area situated within the chimney;
at least one ventilation hole within the upper portion of the inner wall;
at least one ventilation hole within the lower portion of the outer wall;
a fire grate formed of from blank of sheet metal disposed within the combustion area, comprising:
an arc shape extending between a lower elevation portion defining a perimeter and a higher elevation portion disposed substantially at the central axis;
at least one circumferential stiffening ring extending at least partially about the higher elevation portion; and
a plurality of ventilation holes through the sheet metal between the lower elevation portion and the higher elevation portion.
11. The fire pit of claim 10 , wherein the fire grate is supported only at the perimeter.
12. The fire pit of claim 10 , wherein the fire grate comprises a plurality of radial stiffening ribs formed by bends in the sheet metal and extending in a direction between the lower elevation portion and the higher elevation portion.
13. The fire pit of claim 12 , wherein the plurality of radial stiffening ribs include first ribs of a first length and second ribs of a second length different than the first length.
14. The fire pit of claim 10 , wherein the perimeter of the fire grate extends about the central axis and forms a complete circle.
15. The fire pit of claim 10 , wherein the perimeter of the fire grate comprises an outer rim terminating in a downward-facing edge around the perimeter, and wherein the inner wall comprises an upward-facing support, the downward facing edge of the perimeter edge resting on the upward facing support of the inner wall.
16. A fire pit comprising:
a vertically extending outer wall comprising a plurality of air ventilation holes;
a vertically extending inner wall spaced from the outer wall to form an air gap therebetween, the inner wall comprising a plurality of air ventilation holes, the inner wall defining a cavity and having a central axis, the inner wall having a bottom end terminating in an upward facing support;
a fire grate formed of a blank of sheet metal and disposed in the cavity, the fire grate comprising:
a lower elevation portion defining a perimeter edge, the perimeter edge of the fire grate resting on the upward facing support of the inner wall;
a higher elevation portion disposed substantially at the central axis, the fire grate shaped to form an arc between the lower elevation portion and the higher elevation portion; and
a plurality of ventilation holes through the sheet metal between the lower elevation portion and the higher elevation portion.
17. The fire pit of claim 16 , wherein the fire grate comprises a plurality of radial stiffening ribs formed by bends in the sheet metal and extending in a direction between the lower elevation portion and the higher elevation portion.
18. The fire pit of claim 17 , wherein the plurality of radial stiffening ribs include first ribs of a first length and second ribs of a second length different than the first length.
19. The fire pit of claim 16 , wherein the fire grate comprises a plurality of circumferential stiffening ribs formed by bends in the sheet metal and extending transverse to a direction between the lower elevation portion and the higher elevation portion.
20. The fire pit of claim 16 , wherein the perimeter edge of the fire grate extends about the central axis and forms a complete circle.
21. The fire pit of claim 16 , wherein the perimeter edge of the fire grate comprises an outer rim terminating in a downward-facing edge around the perimeter, the downward facing edge of the perimeter edge resting on the upward facing support of the inner wall.