AMENDED CLAIMS

received by the International Bureau on 04 November 2020 (04.11.2020)

Claim 1

Stackable slats for directing light as a preliminary product for blind sun protection hangings for directing irradiating sunlight as side light, comprising slats having metallic reflector lustre at least at the slat top sides, wherein

the slats are folded at least partly angularly in the longitudinal direction and an upper fold angle b₂ and a lower fold angle bi between the folds arise in a horizontal slat position, wherein

at least one portion of the folds has in each case a lateral light irradiation side and a lateral light shadow side, such that on account of the inclination angles of the fold sides at least one lateral light irradiation side in the installation state faces incident sunlight as side light and a lateral light shadow side faces away relative to the lateral light from the upper half-space whereby the folds form an angle bi, and wherein

at least two slats lying one on top of another at least partly have a fold-shaped contour zone K, in which the slats are able to be placed one on top of another shape- complementarily and have at least one edge zone RZ,

characterized in that

- an upper slat lying on a bottom slat in the installation state at least in an edge zone RZ on the lateral light incidence side has at least one larger fold angle b₃ and/or b relative to the fold angles bi and b₂ in the contour zone K, and is embodied such that it is bent and/or curved and/or extended in the longitudinal direction and is embodied without a fold side facing away from the light vis-a-vis very high light incidence, such that

- at least one edge zone RZ of a top slat is shaped differently from an edge zone RZ of a bottom slat, wherein

- the edge zone contour RZ of the overlying slat may not penetrate through the edge zone RZ of the bottom slat contour, and

- the edge zone RZ of the top slat being designed without a fold side that is averted from the very high angles of lateral light incidence, such that

- the slats are stackable in a blind assembly despite different cross-sectional contours in the edge zones RZ of the top and bottom slats, wherein

- in the region of the contour zone K of the top and bottom slat types at the lateral light incidence sides, lateral light is able to be reflected back in the direction of that half space from which the lateral light is incident, and that 12

- at the upper slat lateral light is deflectable at least partly at an edge zone RZ in the direction of that half-space which is opposite the half-space of the lateral light incidence, and that

- at the bottom slat lateral light at least in the edge zone RZ on the lateral light incidence side is able to be reflected back into the half-space from which the lateral light is incident, such that

- with the slat preliminary products bifocal blind sun protection hangings are producible, by means of which in the lower hanging region through the bottom slats lateral light is reflected back substantially into the half-space of the light incidence and in the upper region of the blind sun protection hanging through the overlying slats lateral light with high angles of incidence from the sun is able to be reflected at least partly into the half-space opposite the lateral light incidence and is able to be reflected back into the half-space of the light incidence by way of the shape-complementary contour zone K.

Claim 2

Slats according to Claim 1 , characterized in that the edge zones RZ of the overlying slats have a fold angle b3/ b4 that is > b2 the fold angle in the contour zone K, such that the contours of the edge zone RZ of the overlying slat form self-supporting wing elements which serve as light reflectors and form a reflection focus on the half-space opposite the half-space of the light incidence.

Claim 3

Slats according to Claim 1 , characterized in that the top slats in the edge zone RZ are extended and/or curved and/or bent or formed by appendages wrapped onto the profile top side.

Claim 4

Slats according to Claim 1 , characterized in that the slat edge RZi of a top slat with respect to the lateral light incidence side in terms of their angle inclination with respect to the horizontal is arranged so steeply that low sunlight (23) incident on the underside of the slat edge RZ, is able to be reflected substantially onto the top side of the lower slat at an angle > a_s, the angle of the shadow line between an upper slat and a lower slat. 13

Claim 5

Light-directing slats according to Claim 1 , characterized in that the edge zone RZ located in the half-space opposite the lateral light incidence is embodied in a bent fashion, such that reflected sunlight (25) impinging from below is able to be reflected at a first segment R_ZM - if the louvers are installed as blind in a window - onto the floor plane (100) and reflected lateral light (26) is able to be reflected onto a second segment R_ZI2 > 0° into the interior (102).

Claim 6

Slats according to Claim 1 , characterized in that chords (29) between slat edges in the edge zone RZ at the lateral light incidence side in the envisaged operating state are formed at angles of at least 0° to 30° with respect to the horizontal, such that high lateral light incidence angles between the slats are deflectable into the half-space opposite the lateral light incidence.

Claim 7

Slats according to Claim 1 , characterized in that chords of the slat edges RZ on the interior side I are inclined by 0° to 30° with respect to the horizontal and shallowly incident lateral light at a shallow angle with respect to the horizontal, in particular of 0° to 90°, is deflectable into the half-space opposite the lateral light incidence.

Claim 8

Light-directing slats according to Claim 1 , characterized in that at least one fold at the slat edges RZ on the lateral light irradiation side and/or on the side facing away from the lateral light incidence is at least partly covered by appendages (12, 13) wrapped upwards, and in that lateral light impinging on the latter is at least partly deflectable into the half-space opposite the lateral light incidence, such that a bifocal light deflection arises, wherein each of the appendages (12, 13) produces a focus.

Claim 9

Slats according to Claim 1 to 3, characterized in that at least the bottommost slat for an upper window region (32) can be inserted into at least the topmost slat in the lower window region (30), wherein in particular the slats for an upper window region (32) and/or the slats for a lower window region (30) can be combined in each case to form a 14 slat assembly, wherein particularly preferably all slats are able to be combined to form a slat assembly.

Claim 10

Window hanging consisting of a multiplicity of slats according to any of Claims 1 to 9 having light-reflecting slat top sides, wherein the slats have a fold structure (K) in cross section and the window hangings comprise at least two slat types having different contours for an upper window region and a lower window region,

characterized in that

- the slats for the upper window region and for the lower window region have a folded contour K at least in the slat cross-sectional centre, and

- the slats in the upper window region on the lateral light incidence side and/or on the side of the half-space opposite the lateral light incidence have different contours in the edge zones RZ, which are embodied such that

- the slats are stackable and

- in the upper window region only the insolation incident in the contour zone K is deflectable back into the upper half-space on the side of this lateral radiation incidence and lateral radiation incident on the slat edge zones RZ is deflectable at least partly in the direction of the half-space opposite the lateral light incidence, such that

- in particular zenith radiation is deflectable via a section of the window hangings that is provided for an upper light region into the half-space opposite the lateral light incidence.