Abstract:
The invention relates to a quick-action rolling shutter door and to modules thereof. Quick-action rolling shutter doors are used for closing openings in the walls of warehouses or factory buildings in order to restrict the loss of energy from heated or cooled rooms, and to protect the environment by keeping escaping noise, odours and dust emissions to a minimum. Known quick-action rolling shutter doors have disadvantages in relation to heat insulation. The object of the invention is to provide an improved quick-action rolling shutter door with corresponding modules. According to a first aspect of the invention, a flexible quick-action rolling shutter door hanging ( 12 ) is provided. Said door hanging ( 12 ) can be wound up onto a roller, is guided on at least one side by a guiding device and has at least one thick-walled insulating layer ( 36, 38 ) consisting of plastic foam material.

Description:
FIELD OF THE INVENTION  
         [0001]    The invention relates to a quick-action rolling shutter door and to modules thereof.  
         BACKGROUND OF THE INVENTION  
         [0002]    Quick-action rolling shutter doors are used for closing openings in the walls of warehouses or factory buildings. Here, it is very important that the quick-action rolling shutter door can be opened and closed fast, only leaving the opening in the wall open for the actual passage of a person or a vehicle there-through. This will, on the one hand, restrict any loss of energy from heated or cooled rooms, and, on the other hand, protect the environment by keeping escaping noise, odors and dust emissions to a minimum.  
           [0003]    From practical applications, two types of quick-action rolling shutter door are known. A first type of quick-action rolling shutter door, usually referred to as sectional door, uses rigid door elements which are guided on their sides and, when opened, assume a position parallel to a building wall or ceiling. Said door elements generally include a frame with plural filling inserts of a sandwich construction, similar to the kind used in window or door systems. The K-value of said doors which is between 1.0 to 1.4 can in itself be regarded as good from an energy saving point of view. What is disadvantageous about these doors, however, are their low opening and closing speeds and the high technical effort, amongst other things due to the problems involved in foam-filling the filling inserts with construction material. This construction is not only very problematic when it comes to recycling, but does not afford sufficient protection from burglary, either, since the filling inserts do not offer any resistance.  
           [0004]    Another type of quick-action rolling shutter door which is known from practice as the so called hanging or curtain door, uses a thin-walled plastic tarpaulin which is guided on the sides and can be wound up onto a roller. The high opening and closing speeds of this type of quick-action rolling shutter door are obtained at the expense of insufficient thermal insulation, with K-values ranging from 4.0 to 5.75, as well as insufficient safety from burglary.  
           [0005]    Both types of quick-action rolling shutter door have disadvantages in relation to heat insulation. The disadvantage of sectional doors in this respect is the formation of cold bridges in the region of the joints interconnecting the individual door elements. The insufficient heat insulation of hanging doors is due to the insufficient insulation properties of the material of the hanging.  
           [0006]    Another disadvantage of the prior art quick-action rolling shutter doors is the labor-intensive repair of collision damage. With both types of quick-action rolling shutter door, due to the prior art guiding devices used in them, maintenance work is only possible in the raised, opened state. What makes this shortcoming especially serious is the fact that collisions of vehicles and quick-action rolling shutter door hangings or door elements occur very frequently with quick-action rolling shutter doors. Another disadvantage of the prior art types of quick-action rolling shutter door resides in their insufficient safety from burglary, as already mentioned.  
         SUMMARY OF THE INVENTION  
         [0007]    It is the object of the invention to provide an improved quick-action rolling shutter door with corresponding modules for improving prior art quick-action rolling shutter doors.  
           [0008]    This object is solved according to the invention by the features of claims  1 ,  2 ,  13 ,  16  and/or  30 .  
           [0009]    In accordance with claim  1 , the flexible hanging of the quick-action rolling shutter door, which is wound up onto a roller and guided on at least one side by a guiding device, should have at least one thick-walled insulating layer consisting of foamed plastic material. The fact that foamed plastic material is used, which has pores and chambers with small air cushions preventing any heat exchange through the quick-action rolling shutter door hanging, results in good heat and cold insulation. To achieve such insulation does not require a major constructional effort since the quick-action rolling shutter door hanging is flexible and can thus be readily wound up onto a roller. This allows high-speed opening and closing actions. Consequently, there will be no hinges, either, which would require special insulation measures.  
           [0010]    The hanging of the quick-action rolling shutter door which constitutes a module for a quick-action rolling shutter door and for which protection is also sought separately, independently of claim  1 , preferably exhibits some reinforcement onto which the thick-walled insulation layer has been laminated. Said reinforcement, which may comprise a fabric or web of steel wires, steel strands, glass or carbon fibres, or cotton, serves as a barrier preventing any cutting through said quick-action rolling shutter door hanging, thus preventing burglary. A particular good cost-effectiveness ratio is obtained when a steel fabric is used for reinforcement.  
           [0011]    For facilitating the winding up of the quick-action rolling shutter door hanging, one of its external sides preferably has expansion slots. In the case of a quick-action rolling shutter door hanging with first and second insulation layers, such layers are preferably glued or welded together along contact lines extending transversely to the direction of travel of said quick-action rolling shutter door. Particularly suitable for gluing together insulating layers of polyethylene foam is cyancacrylate.  
           [0012]    Another quick-action rolling shutter door module for which independent protection is sought, is the anti-push-up device as claimed in claim  15 . This anti-push-up device, which is provided especially for quick-action rolling shutter doors, is characterized by at least one detent latch which will latch in the guiding device whenever the distance between adjacent track rollers or sliding elements decreases during opening of the quick-action rolling shutter door. The distance between adjacent track rollers or sliding elements will always decrease when the bottom edge of a quick-action rolling shutter door hanging, or of door elements which are slidable relative to each other, is to be lifted. The fact that said at least one detent latch latches in said guiding device will prevent any further lifting of the quick-action rolling shutter door hanging or the door elements in such a case, thus preventing any burglary attempts in this manner. A bracing spring which will force two detent latches apart whenever the quick-action rolling shutter door hanging or the door elements is/are lifted, facilitates the latching process.  
           [0013]    Yet another quick-action rolling shutter door module which is very advantageous when used together with a quick-action rolling shutter door hanging of the present invention, is a guiding device for quick-action rolling shutter doors, comprising a guide rail which is essentially U-shaped in cross-section and has a guide space for accommodating track rollers or sliding elements, wherein said guide rail is composed of plural parts. The two legs of the guide rail, which extend essentially in parallel in operation, can be shifted relative to each other, making the guide space freely accessible in its opened state. The fact that the guide space is freely accessible in its opened state allows the maintenance of a quick-action rolling shutter door equipped with such a guiding device in its closed state, which in particular makes an exchange or the cleaning of track rollers or sliding elements of a quick-action rolling shutter door possible. As the quick-action rolling shutter door can be kept closed during maintenance, any energy losses and emissions will be minimal. Moreover, this will facilitate maintenance work since the quick-action rolling shutter hanging and its guiding device are easily accessible.  
           [0014]    Another way of minimizing the maintenance and repair work involved in operating a quick-action rolling shutter door is to provide a crash protection device. Such crash protection device for quick-action rolling shutter doors, for which independent protection is also sought, will ensure that the full operativeness of the quick-action rolling shutter door is restored in as short a time as possible after a vehicle has crashed into the hanging or the door elements of the quick-action rolling shutter door. While with quick-action rolling shutter doors of the prior art, parts of the guiding device will become destroyed in a collision, the crash protection device of the invention overcomes this problem in that, in case of a collision with a vehicle, it allows for the releasing of a coupling, thus avoiding the destruction of an element of the guiding device. Preferably, said coupling is designed such that coupling elements which were decoupled or disengaged during the raising of the hanging or door elements of the quick-action rolling shutter door will automatically be coupled or engaged again at funnel-like guide means. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0015]    Other advantageous embodiments and further developments of the invention will become apparent from the subclaims as well as the description which follows in which reference is made to the drawings, of which:  
         [0016]    [0016]FIG. 1 is a view of a first embodiment of a quick-action rolling shutter door according to the invention, with the roller cover removed;  
         [0017]    [0017]FIG. 2 is a simplified perspective view of the top part of the quick-action rolling shutter door of FIG. 1;  
         [0018]    [0018]FIG. 3 is a cut-off perspective view of a hanging for a quick-action rolling shutter door of FIGS. 1 and 2;  
         [0019]    [0019]FIG. 4 is an enlarged perspective view of a first section of the quick-action rolling shutter door hanging of FIG. 3;  
         [0020]    [0020]FIG. 5 is an enlarged perspective view of a second section of the quick-action rolling shutter door hanging of FIG. 3;  
         [0021]    [0021]FIG. 6 is a guiding device according to the invention for a quick-action rolling shutter door of FIGS. 1 and 2;  
         [0022]    [0022]FIG. 7 is one view of an anti-push-up device according to the invention for a quick-action rolling shutter door of FIGS. 1 and 2;  
         [0023]    [0023]FIG. 8 is a simplified view of a pair of detent latches of the anti-push-up device of FIG. 6;  
         [0024]    [0024]FIG. 8 a  is a pair of detent latches for a second embodiment of an anti-push-up device, including a torsion spring for forcing said detent latches apart;  
         [0025]    [0025]FIG. 9 is one view of a section of a crash protection device according to the invention;  
         [0026]    [0026]FIG. 10 is a sectional view, taken along lines IX-IX of FIG. 8, of said crash protection device of FIG. 8 with a quick-action rolling shutter door hanging;  
         [0027]    [0027]FIG. 11 is a simplified perspective view of a coupling of the crash protection device of FIGS. 8 and 9;  
         [0028]    [0028]FIG. 11 a  is a simplified view of another embodiment of a coupling for a crash protection device of FIGS. 8 and 9;  
         [0029]    [0029]FIG. 11 b  is a view of the coupling of FIG. 11 a  as indicated by arrow XI therein, in the coupled state;  
         [0030]    [0030]FIG. 12 is a simplified view of a second embodiment of the quick-action rolling shutter door of the invention;  
         [0031]    [0031]FIG. 13 is a view of a second embodiment of the quick-action rolling shutter door hanging of the invention;  
         [0032]    [0032]FIG. 14 is a view of the reinforcement of the quick-action rolling shutter door hanging of FIG. 13;  
         [0033]    [0033]FIG. 15 is a sectional view of a variant of the quick-action rolling shutter door hanging of FIG. 13 including expansion slots;  
         [0034]    [0034]FIG. 16 is a cut-open view of a portion of the quick-action rolling shutter door hanging of the invention including a transverse girder that may be partitioned longitudinally in operation according to yet another embodiment and a longitudinal strip of a reinforcement;  
         [0035]    [0035]FIG. 17 is a cut-open view of a portion of the quick-action rolling shutter door hanging of the invention including a transverse girder according to yet another embodiment and a longitudinal strap of a reinforcement. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0036]    The first embodiment of a quick-action rolling shutter door  10  according to the invention, shown in FIGS.  1  to  6 , consists of plural quick-action rolling shutter door modules. A first quick-action rolling shutter door module is the quick-action rolling shutter door hanging  12  which is guided on the side and at the top by a guiding device  14 . Said guiding device  14  includes a roller  16  which can be driven to rotate in either direction by a motor  18 . Said motor  18  is controlled by controlling means  20  which will also process signals from contact rails and light barriers supplied via signal lines  22 .  
         [0037]    [0037]FIG. 2 shows the top part  24  of the guiding device  14 . It can clearly be seen in this Figure that the guiding device  14  essentially comprises two lateral guide rails  26 ,  28  as well as a head beam  30  maintaining the distance between said two guide rails. Extending in parallel to said head beam  30  is a roller  16  supported in roller support means  32 .  
         [0038]    Crucial for the quick-action rolling shutter door  10  is the quick-action rolling shutter door hanging  12 , a first embodiment of which is shown in detail in FIGS.  3  to  5  and further embodiments of which are shown in FIGS.  13  to  17 . Like parts are marked with like reference numerals, but increased by 1,000 or 2,000. The quick-action rolling shutter door hanging  12  of the first embodiment illustrated in FIGS.  3  to  5  has a continuous reinforcement  34  of a steel wire fabric, one side of which is laminated with a first insulating layer  36  of a thickness of 25 mm and the other side of which is laminated with a second insulating bayer  38 , likewise 25 mm thick. For use as a burglary-proof door on the outside, a steel fabric is laminated into the foamed material. The steel fabric may be of a thickness of between 0.3 mm to 1 mm. The first and second insulating layers comprise a closed-pore polyurethane foam of a density of 30 kg/m 3 . The first insulating layer is intended to be the external layer and has a smooth fair-faced side  40  which is of the same color as the actual building. The likewise smooth fair-faced side  42  of the insulating layer  38  intended to face inside, by contrast, which may also be customized, is in a glaring color.  
         [0039]    The thick first insulating layer, however, may also be structured on the outside, which creates the visual impression of a sectional door.  
         [0040]    The quick-action rolling shutter door hanging  1012  partially shown in sectional view in FIG. 13, whose reinforcement is not shown therein to keep the drawing simple, has two insulating layers  1036 ,  1038 , which—as opposed to the quick-action rolling shutter door hanging  12  of the first embodiment—are not glued onto each other over their entire surfaces, but merely along contact or glue lines  1002 . Said insulating layers  1036 ,  1038  are made of a cross-linked foamed polyethylene material marked by HT-Troplast AG under the trade name TROCELLENR under the specification  3015  SWB F4 UV. This cross-linked foamed polyethylene material has a raw density of 33±3 kg/m 3 , a longitudinal tensile strength of 0.42 N/mm 2 , a transverse tensile strength of 0.29 N/mm 2 , a ductile yield, in the transverse and longitudinal directions, of approximately 200 percent, a temperature application range in the bending test of up to minus 40° C., a dimensional stability up to plus 95° C., a thermal conductivity at 30° C. of 0.038 w/m K, and a water vapour diffusion current density of &lt;3 g/m 2  d with a thickness of 10 mm.  
         [0041]    Further materials suitable for insulating layers are available from ALVEC under the trade name ALVEOLITR. The properties of these materials may be noted from the table below:  
                                                                                                                                 ISO                   Properties   Standard   Unit   TA   TA FR                    Raw Density    845   kg/m 3     25   25       Tensile Strength   1926       longitudinal       kPa   280   235       transverse       kPa   180   155       Ductile Yield   1926       longitudinal       %   125   115       transverse       %   105   95       Upsetting hardness    844       Upsetting 10%       kPa   12   13       Upsetting 25%       kPa   32   32       Upsetting 50%       kPa   92   92       Pressure Deformation   1856-C       Remainder, 22 h       strain, 23° C.       Upsetting 25%       0.5 h after strain relieve       %   22   21       24 h after strain relieve       %   13   13       Thermal Conductivity   2581       at 10° C.       W/mK   0.034   0.034       at 40° C.       W/mK   0.038   0.039       Operating Temperature   in-house   ° C.   −80/+100   −80/+100       Range       Water Absorption (7 days)   in-house   % v/v   &lt;1   &lt;1       Water Vapour Permeability   1663   g/m 2  × 24 h   3.8 (2 mm)       (Thickness)       μ value (23° C., 0-85% r.F)   1663       5500       Shore Hardness 0/00   in-house       17/33   15/34                            Unit                   Properties   ISO   Standard   TA FRS   TA FRB   TA FMl                    Raw Density    845   kg/m 3     25   25   25       Tensile Strength   1926       longitudinal       kPa   225   235   225       transverse       kPa   140   150   145       Ductile Yield   1926       longitudinal       %   100   110   100       transverse       %   80   100   90       Upsetting Hardness    844       Upsetting 10%       kPa   12   12   12       Upsetting 25%       kPa   31   32   32       Upsetting 50%       kPa   80   95   93       Pressure Deformation   1856-C       Remainder, 22 h       strain, 23° C.,       Upsetting 25%       0.5 h after strain       %   22   21   21       relieve       24 h after strain       %   13   13   14       relieve       Thermal Conductivity   2581       at 10° C.       W/mK   0.034   0.033   0.033       at 40° C.       W/mK   0.039   0/037   0.037       Operating   in-house   ° C.   −80/+100   −80/100   −80/+100       Temperature Range       Water Absorption (17   in-house   % v/v   &lt;1   &lt;1   &lt;1       days)       Water Vapour   1663   g/m 2  × 24 h           1.8 (5.5 mm)       Permeability       (Thickness)       μ value (23° C., 0-   1663               4100       85% r.F)       Shore Hardness 0/00   in-house       16/29   18/29   17/27                  
 
         [0042]    [0042]FIG. 15 shows a variant of the quick-action rolling shutter door hanging  1012  of FIG. 13. This variant of a quick-action rolling shutter door hanging  2012  has expansion slots  2004  on its external side which expand to form notches  2006  during the winding up of the quick-action rolling shutter door hanging  2012 , thus contributing to a strain reduction within the material of the quick-action rolling shutter door hanging  2012  and facilitating the winding up onto rollers.  
         [0043]    [0043]FIG. 14 shows a reinforcement  1034  for the quick-action rolling shutter door hanging which comprises first and second transverse girders  1300 ,  1302  as well as longitudinal strips  1304 . The first transverse girders  1300  are simple aluminum profiles of rectangular cross-section which extend transversely to the direction of travel of the quick-action rolling shutter door hanging and are connected to longitudinal strips at regular intervals by means of through bolts. The longitudinal strips  1304  are flexible metal strips which may easily be wound up, but present a strong resistance towards being cut by knives or other cutting tools. FIG. 17 shows a first transverse girder  1300  and longitudinal strip  1304  together with first and second insulating layers  1036 ,  1038 , respectively.  
         [0044]    [0044]FIG. 16 shows a portion of a quick-action rolling shutter door hanging  1012  with a second transverse girder  1302  which consists of two parts. Said second transverse girder comprises a first transverse girder part  1306  and a second transverse girder part  1308 , which two parts are slid into each other such that they can be slidingly separated along a parting line  1310 . Said first and second transverse girder parts  1306 ,  1308  each have two insertion channels  1312 ,  1314  accommodating the insulation layers  1036 ,  1038 . For interconnection or, if necessary, for connection to first transverse girders  1300 , longitudinal strips  1304  are again provided. Said longitudinal strips  1304  are bent U-shaped around holding means  1316  so as to ensure a safe connection of said longitudinal strips  1304  to said transverse girder parts  1306 ,  1308  via a screwed connection of said longitudinal holding means  1316 . For use of the quick-action rolling shutter door hanging  1012  in an environment where heat or cold insulation is important, the second transverse girders  1302  should be designed such that they will not form cold bridges. To this end, the profiles from which the transverse girder parts  1306 ,  1308  are made may be provided with insulating ribs. As an alternative, second transverse girders  1302  need not be provided altogether since, if first transverse girders  1300  are used exclusively, as shown in FIG. 17, there will not be any cold bridges.  
         [0045]    As an alternative to the insulating layer material described, other materials may also be used in the insulating layers, comprising a flexible open- or closed-cell foamed material of a chemically or physically cross-linked type. A closed skin is advantageous. Materials of foamed polyolef ins of a temperature stability up to at least −35° C., preferably −40° C., and a K-value of &lt;2.5 are particularly suited.  
         [0046]    Foamed materials which are especially well suited are:  
         [0047]    PE—Polyethylene:  
         [0048]    Reusable—UV proof—available in any color, behaviour in fire: DIN  
         [0049]    [0049] 4102  B1, B2 class—temperature application range −40° C. up to 105° C.  
         [0050]    K-value of between 1 and 1.4—raw density of between 30 and 250 kg/m 2 .  
         [0051]    Foam thickness of between 10 mm and 40 mm for the door insert.  
         [0052]    PU—Polyurethane:  
         [0053]    Recyclable, UV proof, extremely sound absorbing, temperature stability 40° C. up to, for a short time, 170° C.  
         [0054]    K-value 1 to 1.4, raw density between 30 and 250 kg/m 2 .  
         [0055]    Behaviour in fire: DIN 4102 B1, B2 class.  
         [0056]    Foam thickness of between 10 mm and 40 mm for the door insert.  
         [0057]    EPDM—Synthetic Rubber:  
         [0058]    Recyclable and suitable for disposal in household rubbish, UV proof, fire behaviour DIN 4102 B1, B2 class.  
         [0059]    Temperature stability from −57° C. to 150° C.  
         [0060]    Foam thickness of between 10 mm and 40 mm for the door insert.  
         [0061]    PVC—Polyvinylchloride.  
         [0062]    For absorbing the wind forces acting on the quick-action rolling shutter door hanging (FIG. 3), antibuckling profiles  44  are provided. These profiles  44  extend on either side of the reinforcement  34  transversely to the direction of travel of the door, bridging the distance between the guide rails  26 ,  28  of the guiding device  14 , and may also serve as the transverse girders of a reinforcement. Said antibuckling profiles  44  extend essentially Z-shaped and have one leg engaging said reinforcement. Their respective other leg engages the external side of the respective insulating layer  36 ,  38 , thus subdividing said insulating layer  36 ,  38  into individual portions. Since said insulating layers  36 ,  38  are flexible, as is notable from FIG. 3, and said antibuckling profiles  44  are of low height, the quick-action rolling shutter door hanging  12  of FIGS.  3  to  5  may be wound up onto roller  16 .  
         [0063]    In order not only to prevent any strong bending or deflection of the quick-action rolling shutter door hanging  12 , but to ensure a reliable support of the quick-action rolling shutter door hanging  12  at the same time, track roller means  46  are provided at the ends of said antibuckling profiles  44  which are opposite each other, with said reinforcement  34  in-between. Said track roller means  46 -also illustrated in FIG. 6—includes an axle body  48  on which two roller bodies  52 , spaced from each other by means of a sleeve  50 , are rotatably mounted. One of said roller bodies  52  contacts support screw means  54  provided at one end thereof. The second roller body is supported by a grab body  58 , screwed onto said axle body  48  and including a slot  56 , so as to loosely contact said sleeve so. In this state, said grab body  58  also encompasses (FIG. 5) a leg each of two opposing antibuckling profiles  44  to which it is at the same time glued, soldered or welded, depending on the material of said antibuckling profiles  44 .  
         [0064]    [0064]FIG. 6 illustrates how said roller bodies  52 , which are supported on their respective axle body  48  and may also be referred to as tandem rollers, are guided in their respective guide rail  26 .  
         [0065]    The guide rail  26  shown in FIG. 6 includes a support body  60  made of a rectangular square profile. Mounted on said support body  60  by means of a hinge  62  is a swivelling part  64  made of an equal angle profile. The edge length of said swiveling part  64  is somewhat longer than that of the support body, enabling said swivelling part  64  to encompass said support body  60 , with a reference edge  66  of said swivelling part and a reference surface  68  of said support body  60  being essentially on one plane at the same time so as to define an oblong aperture  70  therebetween for the quick-action rolling shutter door hanging  12 .  
         [0066]    In the state illustrated in FIG. 6, the free leg  72  of the swivelling part  64  extends essentially in parallel to a longitudinal wall  74  of the support body  60  so that these two elements, i.e., the longitudinal wall  74  of said support body  60  and the free leg  72  of said swivelling part  64 , function almost like parallel legs of a U profile. In order to maintain said support body  60  and said swivelling part  64  in this relative position and thus to prevent this constellation from coming apart in operation, a screwed connection  76  is provided which extends through said swivelling part  64  and engages a threaded bore in said support body  60 .  
         [0067]    The guide rail shown in FIG. 6 is intended for assembly within a refrigerating chamber. In order to prevent the roller bodies  52  from freezing up and thus blocking, the guide chamber  78  defined by the longitudinal wall  74  and the free leg  72  is lined with heat insulation elements  80  which have at least one heating coil  82  on their internal side for heating said guide chamber  78 . Brush bodies  84  provided on either longitudinal side of said aperture  70  will prevent any excessive heat loss from said guide chamber  78 .  
         [0068]    In order to prevent the rolling shutter door hanging from being pushed up, said quick-action rolling shutter door  10  may be equipped with an anti-push-up device  84 . Such an anti-push-up device  84 , which is shown in FIGS. 7 and 8, includes two detent latches  86 ,  88  which are rotatably mounted on the axle body  48  of lower track roller means  46 . In this construction, the centre of gravity of said two detent latches  86 ,  88  is above the axis of rotation of said axle body  48 , in an off-centre position. As a consequence, under the influence of gravity, both detent latches  86 ,  88  would therefore rotate about the axis of rotation of said axle body  48  in opposite directions, if such movement were not prevented for the moment by a retaining belt  90 . If the rolling shutter door hanging  12  were pushed up, however, the retaining belt  90 , which is suspended from the axle body  48  above the axle body  48  bearing the detent latches  86 ,  88 , would become relieved, resulting in said two detent latches  86 ,  88  rotating until they are stopped by the walls of the guide chamber  78  of the guide rail  26 .  
         [0069]    [0069]FIG. 8 a  shows a variant of an anti-push-up device in which the detent latches  86 ′,  88 ′ are pre-biased by a twisting spring  89 .  
         [0070]    FIGS.  9  to  11  illustrate a crash protection device  92  preventing the destruction of track roller means in the case of a collision of a vehicle with the quick-action rolling shutter door hanging  12 . The crash protection device  92 , which may be provided as an alternative to the anti-push-up device  84 , includes track roller means  94  guiding a coupling  96 . Said coupling  96  includes a clamp roller  98  which is accommodated in a support channel  100  of a clamp body  102 . Said clamp body  102  is screwed to a floor rail  104  forming the bottom end of the quick-action rolling shutter door hanging  12 . In this construction, the support channel  100  of the clamp body  102  is oriented so as to extend transversely to the extension of the quick-action rolling shutter door hanging  102 . A minimum holding force between clamp roller  98  and clamp body  102  is obtained in that clamp roller  98  has a rubber-elastic running surface and in that the support channel  100  within said clamp body  102  is concavely shaped both at the top and at the bottom.  
         [0071]    So as to enable the clamp roller  98  to become decoupled from the clamp body  102  in the case of a collision, the quick-action rolling shutter door hanging  12 , in the region of the crash protection device  92 , is cut such that it will not project into the guide rail  26 . In order to safeguard a tight closing nonetheless, a cover  106  is provided where the crash protection device  92  is, which cover  106  is of a design corresponding to the laminated construction of the quick-action rolling shutter door hanging  12  and connects the bottom-most track roller device  94  with the track roller device  108  above it. Besides this cover  106 , coupling belts  110  are provided which keep track roller device  94  and track roller device  108  at a fixed distance from each other.  
         [0072]    In order to accomplish a good sealing between said cover  106  and said quick-action rolling shutter door hanging  12 , the opposing edges  112  and  114  of said cover and said quick-action rolling shutter door hanging  12 , respectively, are curved complementary towards each other, leaving merely a small sealing gap  116  between them. Since both the quick-action rolling shutter door hanging  12  and the cover  106  are made of an elastic material, the quick-action rolling shutter door hanging  12  and the cover  106  will overlap. During decoupling of the crash protection device  92 , some material of the quick-action rolling shutter door hanging  12  and of the cover  106  will be compressed, leaving the lower portion of the quick-action rolling shutter door hanging  12  free.  
         [0073]    [0073]FIGS. 11 a  and  11   b  illustrate a clamp body  102 ′ for a second embodiment of a coupling for a crash protection device. Said clamp body  102 ′ is in two parts, i.e. it comprises upper and lower clamp body halves  1400 ,  1402  which are both inserted in a recession of a profile  1404  extending transversely to the direction of travel of the door. The (common) end  1406  of said upper and lower clamp body halves  1400 ,  1402  which faces a clamp roller  98 ′ is shaped like the clamp body  102  of FIGS.  9  to  11 , with the only exception that no wheel-like projection is being encompassed here.  
         [0074]    The upper and lower clamp body halves  1400 ,  1402  support each other at a contact surface  1408  and each have bevel or chamfered portions on the side opposing the clamp roller so as to leave a free portion  1410  between them, allowing a pincer-like movement of the two clamp body halves  1400 ,  1402  towards each other, either to release or to reaccommodate the clamp roller  98 ′. For pre-biasing the two clamp body halves  1400 ,  1402  in their holding position, a helical spring  1412  is provided at the end of the clamp body opposing the clamp roller  98 ′, with a pressure load acting on said spring  1412  along its longitudinal axis, said spring  1412  being guided in chambers  1414 ,  1416  of the upper or lower clamp body halves  1400 ,  1402 , respectively.  
         [0075]    The quick-action rolling shutter door  10  shown in FIGS.  1  to  6  can be readily assembled within a very short time according to a scheme known from the furniture industry including assembly instructions in the form of illustrations (FIG. 2). The guide rails  26 ,  28  and the top  24 , which are manufactured according to specifications of the clear dimensions, are prefabricated in production in such a way that the user will not have to perform major measurements owing to the specified screwed connections and mountings, and that these parts allow easy assembly according to the unitized construction principle. First of all, the guide rails  26 ,  28  are laid out on the floor, screwed to transverse girders and mounted in the wall opening. The screwed connections of the roller support means to the shaft, hanging, motor and the transverse girders were already provided by the manufacturer. Using a forklift truck, the user will lift the prefabricated roller support means and insert it in the mountings intended for this purpose. Subsequently, the top part is secured (in position) by means of screws.  
         [0076]    It should further be noted that, in view of the bending behaviour of the foamed material and the steel fabric contained therein, the shaft diameter should be 200 mm at least.  
         [0077]    A second embodiment of a quick-action rolling shutter door  210  according to the invention is illustrated in FIG. 12. This quick-action rolling shutter door  210  has a quick-action rolling shutter door hanging  212  which is vertically divided at the centre. The upper end of said hanging  212  extends in a guide rail  226  of a guiding device  214 , and said hanging  212  may be laterally wound up onto a first roller  216  and a second roller  217 . The quick-action rolling shutter door hanging  212  has two mutually complementary magnet rails at its centre which keep the quick-action rolling shutter door hanging  212  together at its centre in its closed state. For increasing safety around the quick-action rolling shutter door  210 , two windows  213  are provided in said quick-action rolling shutter door hanging  212 , which windows  213  are of a transparent plastic material and are welded onto the material of the quick-action rolling shutter door hanging  212 . A quick-action rolling shutter door hanging of this design is also advantageous in a quick-action rolling shutter door of the first embodiment. The quick-action rolling shutter door hanging  212  which is identical in construction to the hanging  12  of the quick-action rolling shutter door  10  of the first embodiment, may readily be provided with windows  213  since its closed-pore insulating layers do not require any sealing or bordering.