Sealing device for sealing a gap between a lintel and a roller shutter and a roller shutter with such a sealing device

Abstract

The invention relates to a sealing device (11, 35, 41) for sealing a gap (32) between a lintel (30) and a roller shutter (10, 34, 40). The sealing device (11, 35, 41) has a sealing means (23) for arranging at the upper end of a top shutter element (24) of the roller shutter (10, 34, 40). For covering a gap (32) in a functional and/or cost-effective way between a lintel (30) and a roller shutter (10, 34, 40), preferably in case of a completely unrolled door blade (12), the sealing device (11, 35, 41) is characterized in that a swivel mechanism (25, 37, 43) is provided for swivelling the sealing means (23) from a sealing position into a winding position and from a winding position into a sealing position.

Claims

1. A sealing device for sealing a gap between a lintel and a roller shutter, the sealing device comprising: a sealing means at an upper end of a top shutter element of the roller shutter; a swivel mechanism arranged to swivel the sealing means from a sealing position into a winding position and from the winding position into the sealing position, wherein the swivel mechanism comprises a first swivel element for swiveling the sealing means from the sealing position into the winding position; and a swivel axis, wherein the first swivel element and the sealing means are positioned to rotate opposite one another with respect to the swivel axis; wherein the first swivel element and the sealing means rotate about the swivel axis to swivel the sealing means from the sealing position to the winding position, such that the first swivel element is moved towards the top shutter element and the sealing means is moved away from the shutter element; wherein the roller shutter comprises a coiling device and wherein the swivel mechanism comprises a further swivel element fixed to the coiling device to rotate the first swivel element and sealing means about the swivel axis into the winding position.

2. The sealing device according to claim 1, wherein the swivel axis comprises a hinge having a flexible rubber profile connecting the sealing means with the upper end of the top shutter element.

3. The sealing device according to claim 1, wherein the sealing means extends traverse to or perpendicular to a plane of the roller shutter when the roller shutter is in a closed position; and wherein the sealing means comprises a flexible sealing profile, a flexible sealing lip or an at least partly flexible sealing flap having a tubular cross-section.

4. The sealing device according to claim 1, wherein the first swivel element extends traverse to or perpendicular to a plane of the roller shutter when the roller shutter is in a closed position; and wherein the first swivel element is a rigid arm, bar, or projection.

5. The sealing device according to claim 4, wherein the first swivel element and the sealing means are arranged in the same plane; and wherein the sealing means rotates about the swivel axis downward to swing into the sealing position and wherein the first swivel element rotates about the swivel axis upward to swing the sealing means into the sealing position.

6. The sealing device according to claim 4, wherein the coiling device comprises a spiral shaped portion for coiling the shutter elements and wherein the further swivel element is fixed to the coiling device in an area of a smallest radius of the spiral shaped portion of the coiling device; and wherein the first swivel element or the further swivel element comprises one or more of a low friction material, a wear-resistant material, and a plastic.

7. The sealing device according to claim 1, wherein the sealing means and first swivel element have a center of gravity and wherein the center of gravity is located on the same side of the swivel axis as the sealing means for allowing the sealing means to rotate about the swivel axis from the winding position into the sealing position under the effect of gravity.

8. The sealing device according to claim 1, wherein the swivel mechanism further comprises at least one actuating element connected with the sealing means or the first swivel element, wherein the actuating element applies a force to swivel the sealing means from the winding position into the sealing position; wherein the actuating element comprises one or more of a spring, a flexible cable, a flexible rod, and a flexible cord.

9. The roller shutter according to claim 1 adapted for opening and closing a doorway, further comprising: a door blade, the door blade comprising: a plurality of rigid shutter elements which are hinged with each other, wherein the top shutter element comprises one of the rigid shutter elements, and wherein the rigid shutter elements are guided by side rails at opposed sides of the doorway.

10. The roller shutter according to claim 9, wherein the door blade is configured to be in a completely unrolled position when the sealing means of the sealing device is in the sealing position; and wherein the door blade is configured to be in an at least partly up rolled position when the sealing means of the sealing device is in the winding position.

11. The roller shutter according to claim 9, wherein the sealing means and the first swivel element extend traverse to or perpendicular to a plane of the top shutter element when the door blade is in a closed position; and wherein the sealing means and the first swivel element extend parallel to the plane of the top shutter element when the door blade is in an up rolled position.

12. The roller shutter according to claim 9, wherein the sealing device is a retrofit kit; and wherein one or more of the swivel mechanism, the first swivel element, a second swivel element, and an actuating element are arranged on a left hand side or right hand side of the roller shutter.

13. The roller shutter according to claim 9, wherein the side rails each comprise a slit; wherein end pieces of the shutter elements are arranged inside the slits of the side rails, the slits guiding the shutter elements for opening and closing the doorway; and wherein the door blade further comprises a carrying strap connected with the end pieces and with a coiling device to roll up and roll down the shutter elements.

14. The roller shutter according to claim 9, further comprising: a coiling device comprising a plurality of spiral discs; wherein at least one of the spiral discs is arranged proximate to each end of a rotatable shaft; wherein each of the spiral discs is shaped for receiving respective end sections of the shutter elements rolled up on the coiling device; and wherein the spiral discs are spaced apart along the shaft a distance for receiving the end sections.

15. The roller shutter according to claim 9, wherein the shutter elements are formed as lamellae, slats or panels, wherein the shutter elements are connected with each other by flexible joints or a flexible carrying strap for rolling up and unrolling the door blade on and off a coiling device.

16. The roller shutter according to claim 9, wherein the roller shutter is a high speed roller door, and wherein the door blade is configured to be moved with a speed in the range of 0.5 m/s to 5 m/s.

17. The roller shutter according to claim 16, wherein the door blade is configured to be moved with a speed in the range of 1 m/s to 3 m/s.

18. The roller shutter according to claim 15, wherein the shutter elements comprise foamed lamellae.

19. The sealing device according to claim 2, wherein the sealing means extends perpendicular to a plane of the roller shutter when the roller shutter is in a closed position; and wherein the sealing means comprises a flexible sealing profile, a flexible sealing lip or an at least partly flexible sealing flap, having a tubular cross-section.

20. The sealing device according to claim 5, wherein the further swivel element is fixed to the coiling device in an area of a smallest radius of the coiling device; and wherein the first swivel element or the further swivel element comprise one or more of a low friction material, a wear-resistant material, and a plastic.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The following detailed description, given by way of example and not intended to limit the present invention solely thereto, will best be appreciated in conjunction with the accompanying figures, wherein like reference numerals denote like elements and parts, in which:

(2) FIG. 1 is a schematic front view of a roller shutter having a sealing device according to the present invention,

(3) FIG. 2 is a schematic cross sectional side view of the roller shutter according to FIG. 1 with the sealing device in a sealing position,

(4) FIG. 3 is a schematic cross sectional view of a detail of the roller shutter according to FIG. 2,

(5) FIG. 4 is a schematic cross sectional side view of the roller shutter with a slightly up rolled door blade,

(6) FIG. 5 is a schematic cross sectional view of a detail of the roller shutter according to FIG. 4,

(7) FIG. 6 is a schematic cross sectional side view of the roller shutter with a partly up rolled door blade and the sealing device in a winding position,

(8) FIG. 7 is a schematic cross section sectional view of a detail of the roller shutter according to FIG. 6,

(9) FIG. 8 is a schematic cross sectional side view of a detail a second roller shutter with a sealing device according to the present invention having a first actuating element,

(10) FIG. 9 is a schematic cross sectional side view of a detail a further roller shutter with a sealing device according to the present invention in a sealing position having a further actuating element, and

(11) FIG. 10 is a schematic cross sectional side view of a detail of the further roller shutter according to FIG. 9 with the sealing device in a winding position.

DETAILED DESCRIPTION

(12) The present invention will now be described more fully hereinafter with reference to the accompanying figures in which preferred embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the illustrated embodiments set forth herein. Rather, these illustrated embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

(13) The roller shutter will be described as a high speed roller door selectively blocking or opening a doorway. This recitation is for convenience only. It would be understood by one skilled in the art that such a roller door or rollup door is suitable for many embodiments and/or applications, including but not limited to industrial high speed rollup doors, interior doorway covering, exterior doorway covering, etc.

(14) FIG. 1 shows a schematic front view of a roller shutter 10 having a sealing device 11 according to the present invention. The roller shutter 10 has a door leaf or door blade 12. According to this figure the door blade 12 is shown in a completely unrolled position for closing a doorway 13. The door blade 12 comprises several shutter elements 14.

(15) For greater clarity not all shutter elements 14 provide a reference numeral. In this embodiment the shutter elements 14 are rigid and foamed lamellae 14. Thus, the lamellae 14 comprise a foamed core. The lamellae 14 are at least partly rotatable coupled to each other allowing up and unrolling of the lamellae 14 around a coiling device 15.

(16) A drive 16 provides a rotational force or torque to a rotatable shaft 17 of the coiling device 15 to raise or up roll the door blade 12 by rotating the coiling device 15 and the shaft 17 in a first direction and to lower or unroll the door blade 12 by rotating the coiling device 15 and the shaft 17 in a second direction opposite to the first direction.

(17) The rotatable shaft 17 is part of the coiling device 15. According to this embodiment the coiling device 15 comprises four spiral discs 18. A pair of two spiral discs 18 is fixed to each end of the rotatable shaft 17. The rotatable shaft 17 is aligned in a horizontal direction.

(18) The roller shutter 10 further comprises two side rails 19. The side rails 19 elongate or extend in a vertical direction and are designed to receive end pieces 20 of the lamellae 14 within the hollow side rails 19.

(19) The side rails 19, provided on both sides of the doorway 13, define the width of the passable doorway 13 and are configured to accept and guide an end section 20 of the lamellae 14 within a slot or slit. In this embodiment the end section 20 is designed as an end piece 20 fixed to the ends of each lamellae 14. Each lamella 14 provides two end pieces 20, one end piece 20 at each lamella end. Both ends of each lamellae 14 are aligned in a horizontal direction and turned away from each other. The lamellae 14 elongate in a horizontal direction.

(20) The lamellae 14 are connected pivotable with each other by a flexible carrying strap 21 connected to the end pieces 20. Between adjacent pivotable connected lamellae 14 a horizontal seal 22 is provided avoiding the entry of moisture and/or dirt. The horizontal seal 22 is flexible and in this embodiment the horizontal seal 22 is made of an elastomer, preferably EPDM (Ethylene Eropylene Diene Monomer) or TPE (Thermo Plastic Elastomer). For greater clarity not all horizontal seals 22 connecting adjacent lamellae 14 with each other provide a reference numeral.

(21) A carrying strap 21 is fixed at each side of the coiling device 15. In this embodiment the upper ends of both carrying straps 21 are fixed between the spiral discs 18 of a pair at each side of the coiling device 15 respectively. The carrying strap 21 is connected with the end pieces 20 to roll up and roll down the lamellae 14. The flexible carrying strap 21 realizes a flexible and/or hinged connection. One carrying strap 21 is provided on each side of the doorway 13 in conjunction with the end pieces 20 assigned to the side rails 19 at each side of the roller shutter 10. In one rotating direction of the coiling device 15 the carrying strap 21 with end pieces 20 will be hoisted and rolled up, causing the lamellae 14 to be wound up around the coiling device 15, opening the doorway 13. In a second rotating direction of the coiling device 15 turned away from the first direction the carrying strap 21 with the end pieces 20 will unwind from its rolled up position, releasing the lamellae 14 to cover the doorway 13. The sections of the carrying straps 21 connected with unrolled end pieces 20 are arranged within or inside the hollow side rails 19.

(22) Each spiral disc 18 may comprise a damping profile on its outer circumference leading to a reduction of noise when lamellae 14 or end pieces 20 are rolled on or rolled up the spiral discs 18. In this embodiment the damping profiles are made of rubber leading to an anti-slip function which avoids movement of up rolled end pieces 20. Furthermore, the wear of a contacting face of end piece 20 is reduced.

(23) The sealing device 11 comprises a sealing means 23. The sealing means 23 is arranged to the upper end of a top shutter element 24. The top shutter element 24 is in this embodiment the topmost lamella 24 of the door blade 12 when the door blade is completely unrolled to close the doorway 13. The sealing means 23 extends substantially over the whole horizontal extent of the top lamella 24. In this embodiment the sealing means 23 is designed as a flexible sealing flap made of plastic.

(24) The sealing device 11 has a swivel mechanism 25 for swivelling the sealing means 23 from a sealing position as shown in FIG. 1 into a winding position and vice versa. In this embodiment the sealing device 11 has a first swivel mechanism 25 on the left hand side of the roller shutter 10 and a second swivel mechanism 25 on the right hand side of the roller shutter 10. In an alternative embodiment only a single swivel mechanism 25 or more than two swivel mechanism 25 may be provided.

(25) The swivel mechanism 25 comprises a first swivel element 26 and a further swivel element 27. The first swivel element 26 is assigned to the sealing means 23 and is designed to cooperate with the further swivel element 27 to guide the sealing device 11 and the sealing means 23 into the winding position. The further swivel element 27 is according to this embodiment fixed at a side of an inner spiral disc 18, whereby the further swivel element 27 extends perpendicular from the side plane of the spiral disc 18 in a direction towards the spiral discs 18 of the other side of the roller shutter 10. In this embodiment the further swivel element 27 is made as a rigid L-shaped bracket.

(26) FIG. 2 is a schematic cross sectional side view of the roller shutter 10 according to FIG. 1 with the sealing device 11 in a sealing position.

(27) In this embodiment an inner side of the roller shutter 10 or door blade 12 is at least partly directed or faced towards the coiling device 15. The rotatable shaft 17 of the coiling device 15 is displaced out of the plane of the closed door blade 12. According to this exemplary embodiment the distance of the shaft 17 to the plane of the closed door blade 12 corresponds substantially to the maximum radius of the spiral disc 18. An outer side of the roller shutter 10 or the door blade 12 is facing away from the inner side and the coiling device 15.

(28) This cross sectional side view shows only one inner spiral disc 18 of a pair of spiral discs 18. It is indicated that the upper end of the carrying strap 21 is mounted to the spiral discs 18. The spiral discs 18 have a continuously increasing radius such that an outer circumference of the spiral discs 18 comprises a mismatch. The smallest radius merge smoothly to the greatest radius over a rotation of approximately 360 degrees. Furthermore, the two spiral discs 18 of each pair are arranged as mirror images of each other.

(29) According to this embodiment the greatest radius of the spiral discs 18 exceeds the smallest radius of the spiral discs 18 by a dimension at least substantially equal to the thickness of end pieces 20 or thickness of the lamellae 14, 24 plus the distance of two layers of lamellae 14 rolled up on each other.

(30) The further swivel element 27 is fixed to the inner side of the inner spiral disc 18 in the area of the smallest radius. A surface 28 of the further swivel element 27 extending perpendicular out of the inner side of the spiral disc 18 is oriented substantially parallel to the outer circumference of the spiral disc 18.

(31) The swivel mechanism 25 comprises a hinge 29. The hinge 29 is fixed to the upper end or upper side of the top lamella 24. In this embodiment the hinge 29 is designed as a flexible rubber profile. The hinge 29 may be identical with the seal 22.

(32) The sealing means 23 is connected with the hinge 29. In the sealing position of the sealing device 11 the sealing means 23 extends towards a lintel or lintel profile 30. In this embodiment the L-shaped lintel profile 30 is fixed to a lintel of the doorway 13.

(33) FIG. 3 is a schematic cross sectional view of a detail of the roller shutter 10 according to FIG. 2. In this embodiment the sealing device 11 has a base profile 31. This base profile 31 has a tube-like cross section to increase stability against twisting. The base profile 31 is flexible connected by the hinge 29 to the upper end of the top lamella 24.

(34) The sealing means 23 is fixed to the base profile 31 and seals in the sealing position a gap 32 between the lintel profile 30 and the top lamella 24. The first swivel element 26 is a rigid arm and fixed to base profile 31. In this embodiment the first swivel element 26 and the sealing means 23 extends in the sealing position of the sealing device 11 perpendicular to a plane of the top shutter element 24 and the closed door blade 12. The sealing means 23 and the first swivel element 26 are directed away from each other. In the sealing position of the sealing device 11 the sealing means 23 is directed away from the coiling device 15 whereas the first swivel element 26 is at least substantially directed towards the coiling device 15.

(35) FIG. 4 is a schematic cross sectional side view of the roller shutter 10 with a slightly up rolled door blade 12. The top lamella 24 is arranged in an area between the top end of the side rails 19 and the coiling device 15. The top lamella 24 is positioned directly next to the coiling device 15, but without being rolled up on the spiral discs 18. In this intermediate position of the top lamella 24 is the sealing device 11 and the sealing means 23 still in the sealing position, but caused by the partly lifting of door blade 12 the gap 32 is not sealed anymore by the sealing means 23. An outer free end of the first swivel element 26 is just contacting the further swivel element 27.

(36) FIG. 5 is a schematic cross sectional view of a detail of the roller shutter 10 according to FIG. 4. A free end of the first swivel element 26 abuts the surface 28 of the further swivel element 27. In an upward oriented direction for up rolling the door blade 12 the surface 28 is arranged in an acute angle to the first swivel element 26. The arrangement of the first swivel element 26 and the further swivel element 27 ensures that the first swivel element 26 and the sealing means 23 will rotate around the swivel axis of the hinge 29 such that the first swivel element 26 is moved towards the top lamella 24 and the sealing means 23 is moved away from the upper end of the top lamella 24. The swivel axis of the hinge 29 is oriented parallel to the upper end of the top lamella 24. In this embodiment the swivel axis of the hinge 29 is at least substantially aligned horizontally and parallel to rotatable shaft 17.

(37) When opening a fully closed doorway 13 by up rolling the door blade 12 the top lamella 24 comes nearer and nearer to the spiral discs 18 until the first swivel element 26 contacts the further swivel element 27 as shown in FIGS. 4 and 5. The free end of the first swivel element 26 hits the surface 28 of the further swivel element 27 and during the further roll up of the door blade 12 and the top lamella 24 the first swivel element 26 is pressed towards a face of the top lamella 24 by the further swivel element 27. Thus, the sealing means 23 swings around the swivel axis of hinge 29 and the free end of the first swivel element 26 slides along the surface 28 of the further swivel element 27 for entering the winding position as shown in following FIGS. 6 and 7.

(38) FIG. 6 is a schematic cross sectional side view of the roller shutter 10 with a partly up rolled door blade 12 and the sealing device 11 in a winding position. The upper lamellae 14 establish a first layer of lamellae 14 or end pieces 20 on the outer circumference of the coiling device 15. The doorway 13 is partly closed or opened and the lamellae 14, guided by a slit 33 in the side rail 19, run into or out of the side rail 19.

(39) In case the door blade 12 would be rolled up the outer radius of the coiling device 15 with the layers of lamellae 14 or end pieces 20 would increase. Thus, the lamellae 14 will start running over and/or along an outer radius of an opening at an upper end of the side rail 19. The face of the outer radius of the opening of the side rail 19 is substantially directed towards the coiling device 15. The outer radius is assigned to an outer side of the side rail 19. Furthermore, the upper end of the side rail 19 is in the area of the outer radius or the lintel profile 30 higher than the upper end of the side rail 19 turned away from the lintel profile 30. In case the door blade 12 would be unrolled the outer radius of the coiling device 15 with the layers of lamellae 14 or end pieces 20 would decrease.

(40) A first layer of lamellae 14 or end pieces 20 arranged on a pair of spiral discs 18 follows a smooth curve or radius as preset by the outer circumference of the spiral discs 18. If the door blade 12 is further rolled up on the coiling device 15, each successive layer of lamellae 14 or end pieces 20 will lie smoothly on top of the underlying layer of lamellae 14 or end pieces 20.

(41) The cross sections of end pieces 20 may be chosen to substantially correspond to the outer circumference of the spiral discs 18 and/or of the layers of up rolled end pieces 20 respectively. This allows successive layers of end pieces 20 wound onto or around the spiral discs 18 and onto preceding layers of end pieces 20 to present a smooth wound outer surface and a compact rolled up door blade 12. In this regard a geometric relationship has to be considered which combines the height of the doorway, the configuration of the spiral discs 18 and the height as well as the cross section of the end pieces 20. Each layer of rolled up end pieces 20 creates a greater diameter or radius of the coiling device 15 for successive layers to wind up onto. This may result in deviating cross sections, convex sections and/or concave sections for each end piece 20 in a row as fixed to the carrying strap 21. Preferably a fully wound up door will require partial and/or full 360 degree revolutions, more preferably one, two, three or more 360 degrees turns, of the shaft 17 depending on the height of the door blade 12 and/or doorway 13.

(42) FIG. 7 is a schematic cross section sectional view of a detail of the roller shutter 10 according to FIG. 6. The further swivel element 27 forces the first swivel element 26 in the winding position. In comparison with the sealing position in accordance with FIGS. 1 to 4 the sealing device 11 or the sealing means 23 is swivelled into the winding position with a turn of about 90 degree around the swivel axis of hinge 29.

(43) The sealing means 23 and the first swivel element 26 are aligned at least substantially parallel to the plane of the top lamella 24. In the winding position of the sealing device 11 the sealing means 23 is directed towards an area of the spiral discs 18 with a radius identical or nearly identical to the maximum radius of the spirals disc 18. The size or dimension of the sealing means 23 is such that the sealing means 23 does not protrude over the outer circumference of the spiral disc 18. This prevents any contact of the sealing means 23 to a lamella 14 of an overlying layer of up rolled lamellae 14.

(44) In the winding position of the sealing device 11 the further swivel element 27 holds the first swivel element 26 reliably in the winding position, thereby forcing and holding the base profile 31 and the sealing means 23 in their winding positions as well.

(45) FIG. 8 is a schematic cross sectional side view of a detail of a second roller shutter 34 with a sealing device 35 according to the present invention having a first actuating element 36. As far as identical elements are concerned reference is made to the above mentioned description.

(46) The sealing device 35 has a swivel mechanism 37 that comprises all elements of the swivel mechanism 25 according to FIGS. 1 to 7. Additionally the swivel mechanism 37 has an actuating element 36. The actuating element 36 is designed to force the sealing device 35 or sealing means 23 from the winding position into the sealing position when the door blade 12 is completely unrolled or closed.

(47) In this embodiment the actuating element 36 is a spring, namely a tension spring. The actuating element 36 is arranged within the top lamella 24. A first end 38 of the actuating element 36 directed away from the sealing device 35 or sealing means 23 is fixed to the top lamella 24. A second end 39 of the actuating element 36 directed away from the first end 38 is connected with sealing means 23 or base profile 31. The second end 39 is fixed to the sealing means 23 or the base profile 31 in an area spaced apart from the swivel axis of the hinge 29. In this embodiment the second end 29 of the actuating element 36 acts on the sealing device 35 or sealing means 23 in an area between the swivel axis of the hinge 29 and an outer free end of the sealing means 23. Thus, the sealing device 35 and the sealing means 23 is forced into the sealing position to cover gap 32 when the first swivel element 26 is not forced into its winding position by the further swivel element 27.

(48) The actuating element 36 may be provided on the left hand side and on the right hand side of the roller shutter 34, whereby each actuating element 36 is capable of forcing the sealing device 35 or sealing means 23 into the sealing position. Thus, providing two or more actuating elements 36 establish a redundant actuating system.

(49) FIG. 9 is a schematic cross sectional side view of a detail of a further roller shutter 40 with a sealing device 41 according to the present invention in a sealing position having a further actuating element 42. As far as identical elements are concerned reference is made to the above mentioned description.

(50) The sealing device 41 has a swivel mechanism 43 that comprises all elements of the swivel mechanism 25 according to FIGS. 1 to 7. Additionally the swivel mechanism 41 has an actuating element 42. The actuating element 42 is designed to force the sealing device 41 from the winding position into the sealing position when the door blade 12 is completely unrolled or closed.

(51) In this embodiment the actuating element 42 is a flexible cable. The actuating element 42 is connecting the rotatable shaft 17 of the coiling device 15 with the first swivel element 26. A first end 44 of the actuating element 42 is fixed at the first swivel element 26. The first end 44 is displaced from a contact area of the first swivel element 26 for cooperating with the further swivel element 27 such that an entanglement of the actuating element 42 with the further swivel element 27 is avoided. A second end 45 of the actuating element 42 directed away from the first end 44 is non-rotatably mounted to the rotatable shaft 17. Thus, the second end 45 is turned together with the rotatable shaft 17 when the coiling device 15 is in rotation for up rolling or unrolling the door blade 12. The length of the flexible actuating element 42 is such that the sealing device 41 and the sealing means 23 is forced into the sealing position for sealing the gap 32 when the door blade 12 is completely unrolled from the coiling device 15 to close the doorway 13. Thus, the sealing device 41 and the sealing means 23 is forced into the sealing position to cover gap 32 when the first swivel element 26 is not forced into the winding position by the further swivel element 27 and when the top lamella 24 is in its lowest position within the roller shutter 40 or the side rails 19. In this position of the top lamella 24 the actuating element 42 is under tension.

(52) In an alternative embodiment the first end 44 of the actuating element 42 is not fixed at the first swivel element 26 but at a separate mounting. The mounting may be fixed to upper end of the top lamella 24 and/or the first swivel element 26. Furthermore, the mounting may be designed as a rigid arm and may be fixed to the base profile 31. Preferably the mounting is designed and arranged substantially like the first swivel element 26. The mounting may be swivelled around the swivel axis of the hinge 29 from a sealing position to a winding position and vice versa like the first swivel element 26.

(53) The actuating element 42 may be provided on the left hand side and on the right hand side of the roller shutter 40, whereby each actuating element 42 is capable of forcing the sealing device 41 or sealing means 23 into the sealing position. Thus, providing two or more actuating elements 42 establish a redundant actuating system.

(54) The actuating elements 36 and 42 according to FIGS. 8 and 9 may be used as alternatives or in combination, preferably for providing a redundant actuating system.

(55) FIG. 10 is a schematic cross sectional side view of a detail of the further roller shutter 40 according to FIG. 9 with the sealing device 41 and sealing means 23 in a winding position.

(56) The upper lamellae 14 establish a first layer of lamellae 14 or end pieces 20 on the outer circumference of the coiling device 15. The doorway 13 is partly closed or opened and the lamellae 14, 24, guided by a slit 33 in the side rail 19, run into or out of the side rail 19.

(57) In the winding position of the sealing device 41 or sealing means 23 the first swivel element 26 and the further swivel element 27 cooperate with each other to hold the sealing means 23 in a position which is substantially swivelled about 90 degree around the swivel axis of the hinge 29. In the winding position the sealing means 23 is aligned substantially parallel to the plane of the top lamella 24.

(58) When the door blade 12 and the top lamella 24 is moved from an unrolled position in which the sealing device 41 or sealing means 23 is in the sealing position according to FIG. 9 upwards or towards the coiling device 15 the flexible actuating element 42 gets relaxed or untensioned. This allows the further swivel element 27 to force the first swivel element 26 together with the sealing means 23 into the winding position.

(59) Although preferred embodiments of the present invention and modifications thereof have been described in detail herein, it is to be understood that this invention is not limited to these precise embodiments and variations and may be effected by one skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

(60) The use of expressions like particularly, preferably, more preferably or especially preferred etc. is not intended to limit the invention. Features which are not specifically or explicitly described or claimed may be additionally included in the structure or method according to the present invention without deviating from its scope.

REFERENCE NUMERALS

(61) 10 roller shutter 11 sealing device 12 door blade 13 doorway 14 shutter element 15 coiling device 16 drive 17 shaft 18 spiral disc 19 side rail 20 end section/end piece 21 carrying strap 22 seal 23 sealing means 24 top shutter element 25 swivel mechanism 26 first swivel element 27 further swivel element 28 surface 29 hinge 30 lintel 31 base profile 32 gap 33 slit 34 roller shutter 35 sealing device 36 actuating element 37 swivel mechanism 38 first end 39 second end 40 roller shutter 41 sealing device 42 actuating element 43 swivel mechanism 44 first end 45 second end