Hotplate-type gas burner

Claim 2

A heating device, comprising a plate-shaped wall having an inside surface and an outside surface so that an article to be heated can be supported on said outside surface and said plate-shaped wall can serve as a hotplate, said inside surface of said plate-shaped wall having a central portion; a ring-shaped wall of one-piece with said plate-shaped wall, said ring-shaped wall extending transversely from said inner surface of said plate-shaped wall in the region of said central portion so as to bound a central space communicable with a source of combustible material and being provided with a plurality of passages through which flame resulting from combustion of the combustible material can leave said central space so that said ring-shaped wall forms a burner which is of one piece with said hotplate and thereby the heat is transmitted to said hotplate not only from the tips of the flame but also from the point wherein the flame leaves said passages; and a bottom wall bounding said central space from below and having an inlet operative to receive therethrough said combustible material.

Claim 3

A heating device as defined in claim 1, wherein said outside supporting surface has a flat cross-section.

Claim 4

A heating device as defined in claim 1, wherein said passages are circumferentially spaced from each other and located adjacently to the inside surface of said plate-shaped wall.

Claim 5

A heating device as defined in claim 3; and further comprising a further wall closing said combustion chamber, thereby preventing loss of heat therefrom.

Claim 6

A heating device as defined in claim 1, wherein said plate-shaped wall has a peripheral wall portion extending transversely to the remainder portion of the same and being of one piece with said remainder portion, said peripheral portion together with said remainder portion of said plate-shaped wall forming a combustion chamber communicating with said central space through said passages.

Claim 7

A heating device, comprising a plate-shaped wall having an inside surface and an outside surface so that an article to be heated can be supported on said outside surface and said plate-shaped wall can serve as a hotplate, said inside surface of said plate-shaped wall having a central portion, said plate shaped wall having a peripheral wall portion extending transversely to the remainder portion of the same and being of one piece with said remainder portion, said peripheral portion together with said remainder portion of said plate-shaped wall forming a combustion chamber; a ring-shaped wall of one-piece with said plate-shaped wall, said ring-shaped wall extending transversely from said inner surface of said plate-shaped wall in the region of said central portion so as to bound a central space communicable with a source of combustible material and being provided with a plurality of passages which communicate said central space with said combustion chamber and through which flame resulting from combustion of the combustible material can leave said central space so that said ring-shaped wall forms a burner which is of one piece with said hotplate and thereby the heat is transmitted to said hotplate not only from the tips of the flame but also from the point wherein the flame leaves said passages; and outlet means for evacuating gases from said combustion chamber.

Claim 8

A heating device, comprising a plate-shaped wall having an inside surface and an outside surface so that an article to be heated can be supported on said outside surface and said plate-shaped wall can serve as a hotplate, said inside surface of said plate-shaped wall having a central portion, said plate shaped wall having a peripheral wall portion extending transversely to the remainder portion of the same and being of one piece with said remainder portion, said peripheral portion together with said remainder portion of said plate-shaped wall forming a combustion chamber; a ring-shaped wall of one-piece with said plate-shaped wall, said ring-shaped wall extending transversely from said inner surface of said plate-shaped wall in the region of said central portion so as to bound a central space communicable with a source of combustible material and being provided with a plurality of passages which communicate said central space with said combustion chamber and through which flame resulting from combustion of the combustible material can leave said central space so that said ring-shaped wall forms a burner which is of one piece with said hotplate and thereby the heat is transmitted to said hotplate not only from the tips of the flame but also from the point wherein the flame leaves said passages; and outlet means for evacuating gases from said combustion chamber.

Claim 9

A heating device as defined in claim 6, wherein said outlet means comprises a plurality of through-going openings provided in said peripheral wall portion, each of said openings having a first end open into said combustion chamber and a second end open into the exterior of the latter.

Claim 10

A heating device, comprising a plate-shaped wall having an inside surface and an outside surface so that an article to be heated can be supported on said outside surface and said plate-shaped wall can serve as a hotplate, said inside surface of said plate-shaped wall having a central portion, said plate-shaped wall having a peripheral wall portion extending transversely to the remainder portion of the same and being of one piece with said remainder portion, said peripheral portion together with said remainder portion of said plate-shaped wall forming a combustion chamber; a ring-shaped wall of one-piece with said plate-shaped wall, said ring-shaped wall extending transversely from said inner surface of said plate-shaped wall in the region of said central portion so as to bound a central space communicable with a source of combustible material and being provided with a plurality of passages which communicate said central space with said combustion chamber and through which flame resulting from combustion of the combustible material can leave said central space so that said ring-shaped wall forms a burner which is of one piece with said hotplate and thereby the heat is transmitted to said hotplate not only from the tips of the flame but also from the point wherein the flame leaves said passages, said passages being circumferentially spaced from each other and located adjacently to the inside surface of said plate-shaped wall; a further wall closing said combustion chamber thereby preventing loss of heat therefrom; and a further inlet operative for permitting air from exterior of said combustion chamber to enter the latter.

Claim 11

A heating device, comprising a plate-shaped wall having an inside surface and an outside surface so that an article to be heated can be supported on said outside surface and said plate-shaped wall can serve as a hotplate, said inside surface of said plate-shaped wall having a central portion, said plate-shaped wall having a peripheral wall portion extending transversely to the remainder portion of the same and being of one piece with said remainder portion, said peripheral portion together with said remainder portion of said plate-shaped wall forming a combustion chamber; a ring-shaped wall of one-piece with said plate-shaped wall, said ring-shaped wall extending transversely from said inner surface of said plate-shaped wall in the region of said central portion so as to bound a central space communicable with a source of combustible material and being provided with a plurality of passages which communicate said central space with said combustion chamber and through which flame resulting from combustion of the combustible material can leave said central space so that said ring-shaped wall forms a burner which is of one piece with said hotplate and thereby the heat is transmitted to said hotplate not only from the tips of the flame but also from the point wherein the flame leaves said passages, said passages being circumferentially spaced from each other and located adjacently to the inside surface of said plate-shaped wall; a further wall closing said combustion chamber thereby preventing loss of heat therefrom; and a further inlet operative for permitting air from exterior of said combustion chamber to enter the latter.

Claim 12

A heating device as defined in claim 8, wherein said further inlet is provided in said further wall.