Lamella type radiator element having foldable projections and a notch

1. A radiator element for use in an air heating device, comprising:

at least one lamella element comprising a plurality of lamellae arranged in a meander-like manner; and

a radiator sheet having a bottom, two opposing lateral sides, a first end, and second end, the first and second ends each extending substantially perpendicular to the bottom and defining a lamella end marking, the lamella end markings defining a length of the lamella element,

wherein said radiator sheet comprises projections extending from the two opposing lateral sides and completely extending between the first end and the second end for the purpose of attaching said lamella element to said radiator sheet prior to assembly of the air heating device, wherein each of the projections has a first length along the respective lateral side and a second length in a vertical direction, and wherein the first length is a multiple of the second length,

wherein each of said projections comprises a groove extending between the first end and the second end, the groove defining a first portion of the projection and a second portion of the projection, the second portion configured to fold at the groove by more than 90° in a single direction with respect to the first portion, the second portion deforming when pressed into the lamella element.

2. The radiator element as claimed in claim 1 , wherein the second length of the projections in the folded state is of approximately 0.4 mm.

3. The radiator element as claimed in claim 1 , wherein the lamella element is attached at the radiator sheet in a manner so that neighboring lamellae contact each other.

4. A heating device for heating air, having a radiator element comprising:

a position frame including a plurality of recesses;

a radiator element configured to be received within one of the recesses, the radiator element including

at least one lamella element comprising a plurality of lamellae arranged in a meander-like manner; and

a radiator sheet having a bottom, two opposing lateral sides, a first end, and second end, the first and second ends each extending substantially perpendicular to the bottom and defining a lamella end marking, the lamella end markings defining a length of the lamella element,

wherein said radiator sheet comprises projections extending from the two opposing lateral sides and completely extending between the first end and the second end for the purpose of attaching said lamella element to said radiator sheet prior to assembly of the air heating device, wherein each of the projections has a first length along the respective lateral side and a second length in a vertical direction, and wherein the first length is a multiple of the second length,

wherein each of said projections comprises a groove extending between the first end and the second end, the groove defining a first portion of the projection and a second portion of the projection, the second portion configured to fold at the groove by more than 90° in a single direction with respect to the first portion, the second portion deforming when pressed into the lamella element.

5. The heating device as claimed in claim 4 , wherein the second length of the projections in the folded state is of approximately 0.4 mm.

6. The heating device as claimed in claim 4 , wherein the lamella element is attached at the radiator sheet in a manner so that neighboring lamellae contact each other.

7. A method for manufacturing a radiator element for use in an air heating device, the method comprising:

providing at least one lamella element comprising a plurality of lamellae arranged in a meander-like manner;

providing a radiator sheet having a bottom, two opposing lateral sides, a first end and a second end, the first and second ends extending substantially perpendicular to the bottom and defining a first and a second lamella end marking, wherein the first and second lamella end markings define a length of the lamella element and in which the radiator sheet comprises projections extending from the two opposing lateral sides and completely extending between the first end and the second end for attaching said lamella element to said radiator sheet prior to assembly of the air heating device, wherein each of the projections has a first length along the respective lateral side and a second length in a vertical direction, and wherein the first length is a multiple of the second length;

providing at least one groove on said projections extending between the first end and the second end, the groove defining a first portion of the projection and a second portion of the projection, the second portion configured to fold at the groove;

applying said at least one lamella element onto the radiator sheet; and

folding the second portion of the projections by more than 90° with respect to the first portion of the projections into said lamella element until the second portion of the projections is deformed and pressed laterally against two opposing sides of said lamella element.

8. The method as claimed in claim 7 , wherein the step of putting said at least one lamella element onto said radiator sheet comprises:

forming a slightly opened U-sheet by folding the projections; and

inserting said at least one lamella element into the U-like sheet.

9. The method as claimed in claim 8 , wherein the opening degree of said slightly opened U-sheet is approximately 5 degree.

10. The method as claimed in claim 7 , wherein the second length of the projections in the folded state is of approximately 0.4 mm.

11. The method as claimed in claim 7 , wherein the lamella element is attached at the radiator sheet in a manner so that neighboring lamellae contact each other.