Patent ID: 7510394

Claim:
A gas-powered heating apparatus comprising: a reservoir storing fuel; a combustor communicated with the reservoir, with the combustor burning the fuel; and a controlling device provided between the reservoir and the combustor, with the controlling device controlling a rate of supply of the fuel to the combustor, wherein the controlling device comprises: a drum defining an inlet; a first space communicated with the inlet; a second space communicated with the first space; a shoulder formed between the first and second spaces; an outlet communicated with the second space and spaced from the shoulder with the shoulder intermediate the outlet and the first space; and an adjusting element located in the second space with the adjusting element deformable between first and second conditions, with the adjusting element having a highest most portion, with the highest most portion and the shoulder creating a first height when the adjusting element is in the first condition, with the highest most portion and the shoulder creating a second height when the adjusting element is in the second condition, with the first height being greater than the second height, with the adjusting element supported upon the shoulder but with a portion spaced from the shoulder by a first gap allowing communication between the first space and the outlet when the adjusting element is in the first condition, with the adjusting element supported upon the shoulder but with a portion spaced from the shoulder by a second gap when the adjusting element is in the second condition when the temperature increases, with the first gap being different than the second gap.