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Method for manufacturing a bent curve element and a blank for manufacturing a bent curved metal element for an endless chain conveying track are disclosed. The bent curve element has a support flange intended to constitute a guide rail for a first side of chain elements forming part of the chain con

Method for manufacturing a bent curve element and a blank for manufacturing a bent curved metal element for an endless chain conveying track are disclosed. The bent curve element has a support flange intended to constitute a guide rail for a first side of chain elements forming part of the chain conveying track, and a web from which the first flange extends. The web is intended to provide torsional rigidity to the bend element. A bend element is used to make bend unit which in turn is used to make a conveying track.

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The invention claimed is: 1. Blank for forming a bent metal curve element for an endless chain conveying track which comprises a support flange intended to constitute a guide rail for a first side of chain elements forming part of the chain conveying track, and a web from which the said flange exte

The invention claimed is: 1. Blank for forming a bent metal curve element for an endless chain conveying track which comprises a support flange intended to constitute a guide rail for a first side of chain elements forming part of the chain conveying track, and a web from which the said flange extends, where the said web is intended to provide torsional rigidity in the curve element, characterized in that the blank consists of a plane metal sheet, which has a first end piece which is intended to be shaped into the said flange and a central piece which is intended to constitute the said web, where said first end piece has a set of slots which run from an edge present on the end piece to the said central piece and said slots widen essentially continuously in the direction towards the said edge, whereby opposite end surfaces present in the slot being arranged so as to form support surfaces resting against one another when bending takes place, which support surfaces extend along essentially the entire length of each slot. 2. Blank according to claim 1, characterized in that said slots form projections located on consecutively following flange elements separated by the slots, where the said projections engage in one another by virtue of the slot forming an overlapping area, whereat opposite end surfaces present in the slot being arranged so as to bear against one another after bending around the said second axis of rotation. 3. Blank according to claim 2, characterized in that the said projections are designed as a pin-shaped projection on a first flange element, which extends essentially in the longitudinal direction of the flange between projections on a second, consecutively following flange element, which extend on either side of the pin-shaped projection. 4. Blank according to claim 2, characterized in that the said projections are designed as hooks which engage in one another after rotation around the said second axis of rotation. 5. Blank according to any one of claims 1-4, characterized in that the end piece and the central piece are joined in a transition area which has a fold indication. 6. Blank according to claim 5, characterized in that the said fold indication has a set of slits which run along the said transition area and are interrupted by web elements which connect the flange to the central piece. 7. Blank according to claim 6, characterized in that the said slots run up to the said slits, and in that at least one web element is located between each pair of slots. 8. Blank according to claim 7, characterized in that the said central piece has cutouts in pairs which delimit fastening plates, where the said cutouts in pairs meet one another at an upper and a lower, second web element. 9. Blank according to claim 8, characterized in that the said upper and lower, second web elements are positioned vertically in relation to the said fold indication. 10. Blank according to claim 9, characterized in that the said central piece has an upper and a lower longitudinal band-shaped structure, which structures are connected by crosspieces, and in that the area between two crosspieces is partly covered by cover elements which are connected to at least one of the said longitudinal band-shaped structures and/or crosspieces by a set of third web elements. 11. Blank according to claim 10, characterized in that the plane metal sheet has a second end piece which is intended to be shaped into a second flange which extends from the said web in the same direction as the said first flange, where the said second end piece has a set of slots which run from an edge present on the second end piece to the said central piece. 12. Bent metal curve element for an endless chain conveying track, which curve element is made from a blank according to claim 11, the curve element comprising a support flange intended to constitute a guide rail for a first side of chain elements forming part of the chain conveying track, and a web from which the said flange extends, where said web is intended to provide torsional rigidity in the curve element, characterized in that said flange has a set of slots which run from an edge present on the end piece to the said central piece. 13. Curve unit for an endless chain conveying track comprising a first curve element having a first support surface intended to constitute a guide rail for a first side of chain elements forming part of the chain conveying track, a second curve element having a second support surface intended to constitute a guide rail for a second side of chain elements forming part of the chain conveying track, and a bracket which supports the said first and second support surfaces in a parallel manner to form a curved track, characterized in that at least the said first curve element (40) consists of a bent metal curve element according to claim 12, said first support surface consisting of a first support flange which extends from a web of the bent metal curve element, where the first support flange has a set of slots which run from a first edge present on the first flange to the said first web. 14. Curve unit according to claim 13, characterized in that the said second curve element consists of a second bent metal curve element, the second curve element comprising a second support flange intended to constitute a guide rail for a second side of chain elements forming part of the chain conveying track, and a second web from which the said second support flange extends, where said second support flange has a set of slots which run from an edge present on the second flange to the said second web, where the said first curve element has a convexly curved web with the said first flange facing towards a centre of curvature of the said first web and the second bend element has a web which is mounted parallel to the said first web and also a second flange which faces towards the first flange, the said first and second flanges forming a track for chain elements forming part of the said chain conveying track. 15. Curve unit according to claim 13, characterized in that the said second curve element comprises a rotatably arranged support surface intended to constitute a guide rail for a second side of chain elements forming part of the chain conveying track, in that the first curve element has a convexly curved web with the said first flange facing towards a centre of curvature of the said first web, and in that the support surface of the second curve element is mounted coaxially with the said first flange, the said first flange and the support surface forming a track for supporting chain elements forming part of the said chain conveying track. 16. Bend unit according to claim 15, characterized in that the said bracket consists of an essentially plane metal plate made from thicker material than the said first bend element, and in that the said plane metal plate bears a set of bent lugs to which the said first and second bend elements (40, 51) are attached. 17. Endless chain conveying track comprising a curve unit and a conveying chain which runs through the said curve unit, characterized in that the curve unit is designed according to claim 16 and comprises a first metal curve element which comprises a first support flange which constitutes a guide rail for a first side of chain elements forming part of the conveying chain, and a first web from which the said first support flange extends, where the said first web is intended to provide torsional rigidity in the first bend element, a second curve element which has a second support surface which constitutes a guide rail for a second side of chain elements forming part of the conveying chain, and a bracket which supports the said first and second bend elements.