Closure device with a screen presenting flexible side edges
The invention concerns a device comprising a screen ( 2 ) presenting flexible side edges ( 4 ) having an overthickness ( 4 ′), this screen ( 2 ) being equipped with one cable or with several juxtaposed cables ( 21 ), incompressible in their lengthwise direction, extending parallel to the side edges ( 4 ) of the screen so as to enable the application of a thrust force on these side edges ( 4 ) in their longitudinal direction to move the screen to its closed position, this cable or cables ( 21 ) being located in the neutral surface ( 24 ) of said edges ( 4 ) formed on bending of the latter and being fixed with respect to the screen ( 2 ) in an unremovable way; the overthickness comprises a flexible strip ( 8 ) made of an elastic material, wherein the cable or cables ( 21 ) are incorporated, as well as two notched belts ( 9, 10 ) being located the one with respect to the other on each of both sides of the curtain ( 2 ).
1. Device for closing a doorway or other opening ( 1 ) comprising a screen ( 2 ) presenting flexible side edges ( 4 ) with an overthickness ( 4 ′) extending in the longitudinal direction of the side edges ( 4 ),
this overthickness ( 4 ′) being guided by guide channels ( 5 ) thus enabling the screen ( 2 ) to be moved between a closed position and an open position,
whereby the screen ( 2 ) is equipped with at least one cable ( 21 ), substantially incompressible in its lengthwise direction, extending substantially parallel to the side edges of the screen ( 2 ) so as to enable the application of a thrust force on these side edges ( 4 ) in their longitudinal direction to move the screen from its open position to its closed position,
wherein said at least one cable ( 2 ) is incorporated in the overthickness ( 4 ′),
whereby further the side edges ( 4 ) have a neutral surface ( 24 ), being a plane in which neither compression, nor any elongation takes place along the longitudinal direction of the edge when applying bending forces to the edge,
the neutral surface ( 24 ) of said side edges ( 4 ) formed on bending of the cable ( 21 ) being located in this cable ( 21 ), the latter being fixed with respect to the screen ( 2 ), near each of the side edges ( 4 ) of this screen in an unremovable way preventing any movement with respect to the screen ( 2 ), driving means ( 28 ) are provided, enabling the thrust force to be exerted on the cables in their longitudinal direction which enables the movement of the screen towards it's closed position.
2. Device according to claim 1 , characterised in that the screen ( 2 ) is equipped with a series of several juxtaposed cables ( 21 ) immobilised with respect to each other and extending in a plane parallel to the plane of the screen ( 2 ).
3. Device according to claim 1 or 2 , characterised in that the cable or cables ( 21 ) are formed from several twisted strands.
4. Device according to claim 1 or 2 , characterised in that the cable or cables ( 21 ) are maintained in an elastic support ( 22 ).
5. Device according to claim 1 or 2 , characterised in that the screen has two cables ( 21 ), both of which are incorporated in the overthickness ( 4 ′).
6. Device according to claim 5 , characterised in that the overthickness ( 4 ′) is mounted on the screen ( 2 ) in such a way as to be able to move in the guide channels ( 5 ).
7. Device according to claim 1 or 2 , characterised in that said overthickness ( 4 ′) fully covers the cable or cables ( 21 ).
8. Device according to claim 1 or 2 , characterised in that the cable or cables ( 21 ) are incorporated in a strip ( 8 ) made of a substantially elastic material on the neutral surface ( 24 ) formed on bending of the strip ( 8 ).
9. Device according to claim 8 , characterised in that, when the screen ( 2 ) is mounted on a drum ( 3 ), the strip ( 8 ) is fixed with respect to the screen ( 2 ) only with its face located on the side of the centre of curvature of the rolled screen.
10. Device for closing a doorway or other opening ( 1 ) comprising a screen ( 2 ) presenting flexible side edges ( 4 ) with an overthickness ( 4 ′) extending in the longitudinal direction of the side edges ( 4 ),
this overthickness ( 4 ′) being guided by guide channels ( 5 ) thus enabling the screen ( 2 ) to be moved between a closed position and an open position,
whereby the screen ( 2 ) is equipped with at least one cable ( 21 ), substantially incompressible in its lengthwise direction, extending substantially parallel to the side edges of the screen ( 2 ) so as to enable the application of a thrust force on these side edges ( 4 ) in their longitudinal direction to move the screen from its open position to its closed position,
whereby further the side edges ( 4 ) have a neutral surface, being a plane in which neither compression, nor any elongation takes place along the longitudinal direction of the edge when applying bending forces to the edge,
the neutral surface ( 24 ) of said side edges ( 4 ) formed on bending of the cable ( 21 ) being located in this cable ( 21 ), the latter being fixed with respect to the screen ( 2 ), near each of the side edges ( 4 ) of this screen in an unremovable way preventing any movement with respect to the screen ( 2 );
wherein the cable or cables ( 21 ) are incorporated in a strip ( 8 ) made of a substantially elastic material on the neutral surface ( 24 ) formed on bending of the strip ( 8 ); and
wherein said overthickness ( 4 ′) comprises notched belts ( 9 , 10 ) presenting a series of teeth ( 11 , 12 ) and extending on either side of the plane of the screen ( 2 ) in the longitudinal direction of the side edges ( 4 ), the strip ( 8 ) being incorporated between said notched belts ( 9 , 10 ).
11. Device for closing a doorway or other opening ( 1 ) comprising a screen ( 2 ) presenting flexible side edges ( 4 ) with an overthickness ( 4 ′) extending in the longitudinal direction of the side edges ( 4 ),
this overthickness ( 4 ′) being guided by guide channels ( 5 ) thus enabling the screen ( 2 ) to be moved between a closed position and an open position,
whereby the screen ( 2 ) is equipped with at least one cable ( 21 ), substantially incompressible in its lengthwise direction, extending substantially parallel to the side edges of the screen ( 2 ) so as to enable the application of a thrust force on these side edges ( 4 ) in their longitudinal direction to move the screen from its open position to its closed position,
whereby further the side edges ( 4 ) have a neutral surface, being a plane in which neither compression, nor any elongation takes place along the longitudinal direction of the edge when applying bending forces to the edge,
the neutral surface ( 24 ) of said side edges ( 4 ) formed on bending of the cable ( 21 ) being located in this cable ( 21 ), the latter being fixed with respect to the screen ( 2 ), near each of the side edges ( 4 ) of this screen in an unremovable way preventing any movement with respect to the screen ( 2 ); and
wherein said overthickness ( 4 ′) comprises notched belts ( 9 , 10 ) presenting a series of teeth ( 11 , 12 ) and extending on either side of the plane of the screen ( 2 ) in the longitudinal direction of the side edges ( 4 ), said at least one cable ( 21 ) being incorporated between said notched belts ( 9 , 10 ).