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A coupling for a door/curtain includes a plurality of coupling mechanisms affixed to ends of slats of the door/curtain. Each coupling mechanism includes a roller mounting bracket having a first roller arranged at an upper portion of the roller mounting bracket, and an extending portion, oriented at

A coupling for a door/curtain includes a plurality of coupling mechanisms affixed to ends of slats of the door/curtain. Each coupling mechanism includes a roller mounting bracket having a first roller arranged at an upper portion of the roller mounting bracket, and an extending portion, oriented at approximately 90 degrees with respect to the upper portion of the roller mounting bracket; and at least one second roller. Each second roller is rotatable around an axis perpendicular to the axis of rotation of the first roller. The first roller and the at least one second roller are arranged so as to cooperate with an outer track, inner track, roller support guide and first and second roller guides of a guide rail assembly to ensure that the door/curtain moves rollingly within the guide rail assembly even when the door/curtain is subjected to a deflecting force.

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1. A door assembly for covering an opening defined by at least one structural element of a building, the door assembly comprising: a shutter roller rotatable about an axis of rotation;a drive mechanism configured to rotate the shutter roller about the axis of rotation; a flexible door or curtain win

1. A door assembly for covering an opening defined by at least one structural element of a building, the door assembly comprising: a shutter roller rotatable about an axis of rotation;a drive mechanism configured to rotate the shutter roller about the axis of rotation; a flexible door or curtain windable on and off the shutter roller such that the flexible door or curtain is movable into retracted and extended positions by operation of the drive mechanism, the flexible door or curtain having a plurality of connected slats, each having two ends; at least one guide rail assembly positioned on at least one side of the opening and coupled to the at least one side of the opening, each instance of the at least one guide rail assembly having: (a) an outer track, coupled to the at least one structural element of the building and having at least a first portion extending parallel to the flexible door or curtain,(b) an inner track, coupled to the at least one structural element of the building and having at least a first portion extending parallel to the outer track and parallel to the flexible door or curtain,(c) a roller support guide, arranged fixedly between the outer track and the inner track, and(d) first and second roller guides disposed opposite one another between the inner track and the outer track, with a space maintained between the first and second roller guides; anda plurality of coupling mechanisms, each of the plurality of coupling mechanisms being affixed to an end of one or more of the plurality of slats of the door or curtain, wherein each of the plurality of coupling mechanisms is attachable to two different slats, each of the plurality of coupling mechanisms comprising: (a) at least two door or curtain mounting brackets, each door or curtain mounting bracket having: (i) a mounting surface configured to connect to a slat of the door or curtain, and(ii) an extending surface oriented at approximately 90 degrees with respect to the mounting surface, the extending surface having at least one endlock configured to maintain alignment of the slats of the door or curtain;(b) a roller mounting bracket having: (i) a first roller arranged at an upper portion of the roller mounting bracket, the first roller being rotatable around an axis perpendicular to the lengthwise direction of the slats, and(ii) an extending portion, oriented at approximately 90 degrees with respect to the upper portion of the roller mounting bracket and connected to the at least one endlock; and(c) at least two second rollers, each second roller being rotatable around an axis perpendicular to the axis of rotation of the first roller and connected to the at least one endlock, the second rollers being arranged so as to be aligned with respect to each other in a direction of door or curtain propagation and offset in relation to the first roller,wherein the first roller and the second rollers are arranged so as to cooperate with the outer track, inner track, roller support guide and first and second roller guides to ensure that the door or curtain moves rollingly within the guide rail assembly even when the door or curtain is subjected to a deflecting force. 2. The door assembly according to claim 1, the at least one guide rail assembly further having a mounting support configured to secure the at least one guide rail assembly to the at least one structural element of the building, at least a first end of the mounting support being configured to be affixed to the at least one structural element of the building. 3. The door assembly according to claim 1, the coupling mechanisms each being linkable to an adjacent one of the coupling mechanisms by a link coupled to posts of the adjacent one of the coupling mechanisms. 4. The door assembly according to claim 1, wherein, in an assembled state of the door assembly, both second rollers of each of the plurality of coupling mechanisms are maintained between the first and second roller guides even when the door or curtain is subjected to a deflecting force. 5. The door assembly according to claim 1, wherein, in an assembled state of the door assembly, the door assembly is configured such that each first roller is maintained in the at least one guide rail assembly between the roller support guide and at least one of the inner track and outer track, to ensure rolling contact between the first roller and the guide rail assembly even when the door or curtain is subjected to a deflecting force. 6. The door assembly according to claim 1, the coupling mechanisms each further comprising a spacing mechanism arranged between at least one of the two second rollers and at least one selected from the group consisting of the extending surface of the door or curtain mounting bracket and the extending portion of the roller mounting bracket. 7. The door assembly according to claim 1, wherein the drive mechanism comprises a motor coupled to the shutter roller. 8. The door assembly according to claim 7, wherein the drive mechanism comprises a motor coupled to the shutter roller via an intermediate pusher cog. 9. The door assembly according to claim 8, wherein the pusher cog has a plurality of cog teeth, and the pusher cog assists in moving the door or curtain between a closed position and an open position by engagement of the cog teeth with spaces formed in the plurality of coupling mechanisms between the second rollers. 10. The door assembly according to claim 1, wherein the drive mechanism is contained within a drive housing. 11. The door assembly according to claim 1, wherein the door assembly is a side coiling door assembly in which: the at least one guide rail assembly is coupled to a top side of the opening;the slats and shutter roller are arranged perpendicular to the ground; andthe coupling mechanisms are arranged at top ends of the slats, proximal to the top side of the opening. 12. The door assembly according to claim 11, wherein the drive mechanism is contained within a drive housing. 13. The door assembly according to claim 12, wherein the drive mechanism comprises a motor coupled to the shutter roller. 14. The door assembly according to claim 13, wherein the drive mechanism comprises a motor coupled to the shutter roller via an intermediate pusher cog. 15. The door assembly according to claim 14, wherein the pusher cog has a plurality of cog teeth, and the pusher cog assists in moving the door or curtain between a closed position and an open position by engagement of the cog teeth with spaces formed in the plurality of coupling mechanisms between the second rollers. 16. The door assembly according to claim 1, wherein the door assembly is a horizontal coiling door assembly in which: the at least one structural element comprises a floor of the building and the opening comprises a hole formed in the floor of the building;the at least one guide rail assembly comprises two guide rail assemblies, one coupled to the floor at one side of the hole formed in the floor, and the other coupled to the floor at the other side of the hole formed in the floor;the slats and shutter roller are arranged parallel to the ground and perpendicular to the direction of closing and opening the door or curtain; andthe coupling mechanisms are arranged at both ends of the slats, respectively proximal to the one side of the hole in the floor and to the other side of the hole in the floor. 17. The door assembly according to claim 16, wherein the drive mechanism is contained within a drive housing. 18. The door assembly according to claim 17, wherein the drive mechanism comprises a motor coupled to the shutter roller. 19. The door assembly according to claim 18, wherein the drive mechanism comprises a motor coupled to the shutter roller via an intermediate pusher cog. 20. The door assembly according to claim 19, wherein the pusher cog has a plurality of cog teeth, and the pusher cog assists in moving the door or curtain between a closed position and an open position by engagement of the cog teeth with spaces formed in the plurality of coupling mechanisms between the second rollers. 21. The door assembly according to claim 1, wherein the door assembly is a vertical coiling door assembly in which: the opening is a hole formed in a wall of the building;the at least one guide rail assembly comprises two guide rail assemblies, one coupled to one side of the hole formed in the wall, and the other coupled to the other side of the hole formed in the wall;the slats and shutter roller are arranged perpendicular to the ground and perpendicular to the direction of closing and opening the door or curtain; andthe coupling mechanisms are arranged at both ends of the slats, respectively proximal to the one side of the hole in the wall and to the other side of the hole in the wall. 22. The door assembly according to claim 21, wherein the drive mechanism is contained within a drive housing. 23. The door assembly according to claim 22, wherein the drive mechanism comprises a motor coupled to the shutter roller. 24. The door assembly according to claim 23, wherein the drive mechanism comprises a motor coupled to the shutter roller via an intermediate pusher cog. 25. The door assembly according to claim 24, wherein the pusher cog has a plurality of cog teeth, and the pusher cog assists in moving the door or curtain between a closed position and an open position by engagement of the cog teeth with spaces formed in the plurality of coupling mechanisms between the second rollers. 26. The door assembly according to claim 23, wherein the motor is coupled directly to the shutter roller by a belt or chain drive configuration. 27. A coupling for a door assembly for covering an opening defined by at least one structural element of a building, the door assembly having: a shutter roller rotatable about an axis of rotation; a drive mechanism configured to rotate the shutter roller about the axis of rotation; a flexible door or curtain windable on and off the shutter roller such that the flexible door or curtain is movable into retracted and extended positions by operation of the drive mechanism, the flexible door or curtain having a plurality of connected slats, each having two ends; at least one guide rail assembly positioned on at least one side of the opening and coupled to the at least one side of the opening, each instance of the at least one guide rail assembly having: (a) an outer track, coupled to the at least one structural element of the building and having at least a first portion extending parallel to the flexible door or curtain, (b) an inner track, coupled to the at least one structural element of the building and having at least a first portion extending parallel to the outer track and parallel to the flexible door or curtain, (c) a roller support guide, arranged fixedly between the outer track and the inner track, and (d) first and second roller guides disposed opposite one another between the inner track and the outer track, with a space maintained between the first and second roller guides, the coupling comprising: a plurality of coupling mechanisms, each of the plurality of coupling mechanisms being affixed to an end of one or more of the plurality of slats of the door or curtain, wherein each of the plurality of coupling mechanisms is attachable to two different slats, each of the plurality of coupling mechanisms comprising: (a) at least two door or curtain mounting brackets, each door or curtain mounting bracket having: (i) a mounting surface configured to connect to a slat of the door or curtain, and(ii) an extending surface oriented at approximately 90 degrees with respect to the mounting surface, the extending surface having at least one endlock configured to maintain alignment of the slats of the door or curtain;(b) a roller mounting bracket having: (i) a first roller arranged at an upper portion of the roller mounting bracket, the first roller being rotatable around an axis perpendicular to the lengthwise direction of the slats, and(ii) an extending portion, oriented at approximately 90 degrees with respect to the upper portion of the roller mounting bracket and connected to the at least one endlock; and(c) at least two second rollers, each second roller being rotatable around an axis perpendicular to the axis of rotation of the first roller and connected to the at least one endlock, the second rollers being arranged so as to be aligned with respect to each other in a direction of door or curtain propagation and offset in relation to the first roller,wherein the first roller and the second rollers are arranged so as to cooperate with the outer track, inner track, roller support guide and first and second roller guides to ensure that the door or curtain moves rollingly within the guide rail assembly even when the door or curtain is subjected to a deflecting force.