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You are an expert at summarizing long articles. Proceed to summarize the following text: 
The present invention relates to a modular upright for curtain-type service doors for buildings and more particularly to opposite vertical uprights fastened to a guide device or slide for guiding the flexible curtain when it moves between an open position and a closed position. 
     BACKGROUND OF THE INVENTION 
     Vertical uprights are known in the art that consist of bent sheet metal slides, drawn aluminum slides or extruded plastic material slides. 
     By virtue of their structure and their shape these slides can also constitute the vertical uprights of a service door of the flexible curtain type. 
     These slides are generally produced in one part or at most two parts and have certain drawbacks in that they are exposed to impact with the risk of irreparable damage necessitating complete replacement. 
     There are also known from the applicant&#39;s patent No. EP 0979340 vertical service door uprights including taut flexible slides on a bent sheet metal structural section. 
     SUMMARY OF THE INVENTION 
     The modular service door upright of the present invention consists of a number of combined structural elements that are produced in different materials to provide total resilience and flexibility in order to be able to absorb impacts without risk of damaging said structural elements. 
     The modular service door vertical upright of the invention includes an upper plate fastened to the horizontal box section and more particularly to the lateral flange, a lower plate fixed to the ground, a central core connecting the upper plate and the lower plate together, a cloth fixed around the upper plate and the lower plate in order to constitute over the full height of the upright an envelope, and a guiding device constituting a slide for movement of the flexible curtain, and in that each element constituting the upright of the service door is adapted to make it very resilient, i.e. highly resistant to impact, because of the elastic deformation of each of its elements. 
     The service door modular vertical upright of the present invention has other essential features that are described in and protected by the secondary claims dependent directly or indirectly on the main claim. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The appended drawings, provided by way of example, explain the invention, its features and the advantages that it can procure: 
         FIGS. 1 and 2  are perspective views showing a service door including modular uprights of the present invention. 
         FIGS. 3 to 6  are perspective views representing in detail the structural elements constituting each service door modular upright of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     There is shown in  FIGS. 1 and 2 , by way of example, a service door  1  for industrial buildings including two opposite modular lateral uprights  2  and  3  connected together at the top by a horizontal box section  4 . The modular lateral uprights  2  and  3  can be fixed or not at a certain distance from the face  5  of a wall, depending on the function of the service door  1 . 
     In this example, the service door  1  is a roller door including in the horizontal box section  4  connecting the modular uprights  2  and  3  together a driving drum  7  for rolling and unrolling a flexible curtain  6  between an open position and a closed position. 
     The flexible curtain  6  includes sheaths  9  each of which receives inside it horizontal reinforcement crossmembers  10 . 
     Each modular vertical upright  2 ,  3  includes a guiding device  15  for guiding the flexible curtain  6  and the horizontal reinforcement crossmembers  10  during vertical movement of said curtain between an open position and a closed position. 
     For example, the guiding device  15  provided on each modular upright  2 ,  3  can consist either of two taut straps  16 ,  17  or of two semi-rigid slats disposed face-to-face as described in the applicant&#39;s patents EP 0979340 and EP 1248892. 
     There are represented in  FIGS. 3 to 6  the structural elements constituting the modular vertical upright  2  of the service door  1 , the other modular vertical upright  3  being of identical construction. 
     Thus the modular upright  2  consists of an upper plate  18  fastened to the horizontal box section  4  and more particularly a lateral flange  19  for retaining the driving drum  7  of the service door  1  and guiding its rotation. The upper plate  18  is below and in line with the lateral flange  19  so as to face the ground in the opening receiving the service door  1 . 
     The modular upright  2  includes a lower plate  20  with the same profile as the upper plate  18  which is fixed to the ground in the opening in which the service door  1  is to be installed. 
     The modular upright  2  includes a central core  21  connecting together the upper plate  18  and the lower plate  20 . The central core  21  can consist of at least one tubular vertical structural section  22  produced for example in a composite or plastic material or in steel with a high elastic limit offering good deformation characteristics so that it can return to its original position after an impact. 
     The central core  21  can consist of two or four tubular structural sections  22 , for example. 
     If the central core  21  consists of four tubular structural sections  22 , for example, the first two tubular structural sections  22  are fixed between the upper plate  18  and the lower plate  20  and the other two tubular structural sections  22  are retained between two other plates, namely an upper plate  18   a  and a lower plate  20   a , producing a framework for guiding and housing a counterweight  26  in a manner appropriate to the structure of the service door  1  ( FIG. 4 ). 
     The modular vertical upright  2  includes a guiding device  15  consisting of two taut straps  16 ,  17  fixed in the upper plate  18  and the lower plate  20 . Each taut strap  16 ,  17  includes in its upper portion an inclined shoe  15   a  fastened to the upper plate  18 . The straps  16 ,  17  are fixed to the lower plate  20  by a tensioner  15   b  that can be rotated to adjust the tautness of said straps. 
     The modular upright  2  includes a cloth  23  that is produced in a single-skin or double-skin technical fabric similar to that used for the flexible curtain  6  and fastened around the upper plate  18  and the lower plate  20  to constitute over the full height of said upright an envelope  24  having an external profile similar to that of said plates  18 ,  20 . The envelope  24  can also cover the upper plates  18 ,  18   a  and lower plates  20 ,  20   a  if the modular upright  2  includes a central core  21  consisting of four parallel tubular structural sections  22 . 
     The envelope  24  consists of a cloth  23  with cloth panels  23   a ,  23   b ,  23   c ,  23   d  arranged and fixed, for example welded, together to follow the dimensions and external contour of the upper plate  18  and the lower plate  20  to cover the latter and the central core  21  of the modular upright  2 . 
     The cloth panel  23   d  of the envelope  24  is slit over its full height to form two half-panels  23   e ,  23   f  to delimit an entry for fitting said envelope  24  around the upper plate  18  and the lower plate  20 . 
     The two half-panels  23   e ,  23   f  are connected together by closure means  25  of the zip, popper, Velcro type to retain the envelope  24  around the upper plate  18  and the lower plate  20 . 
     Facing the cloth panel  23   d  is the cloth panel  23   b  of the envelope  24  that is intended to come to bear against the face  5  of the wall receiving the service door  1 . The cloth panel  23   b  has on its external face and over its full height a bead  23   g  that bears against the face  5  of the wall in order to provide a seal therewith. 
     The larger cloth panels  23   a ,  23   c  are perpendicular to the cloth panel  23   d  of the envelope  24 . The cloth panel  23   c  has on its external face and over its full height a housing  23   h  through which electrical cables can be passed, for example. 
     The cloth panel  23   a  has on its external face and over its full height tongues  23   i ,  23   j  disposed in the vicinity of the areas of connection with the cloth panels  23   b  and  23   d , respectively, of the envelope  24 . The tongues  23   i  and  23   j  provide a lateral seal when they are in contact with the corresponding taut straps  16 ,  17  of the guiding device  15 . 
     The cloth panel  23   a  can equally include in its lower portion at least one opening  23   k , not shown, for security cells. 
     The cloth panel  23   a  can equally include in the middle and over its full height one or two other central tongues  23   m  providing a lateral seal when they are in contact with the edges of the flexible curtain  6  of the service door when it moves between an open position and a closed position. In this case, the cloth panel  23   a  can include in its lower portion and between the tongues  23   i ,  23   j  and the central tongues  23   m  at least one opening  23   k  for security cells that are not shown ( FIG. 6 ). 
     The envelope  24  can consist of a cloth  23  produced from a double-skin fabric solving the problems of heat exchange and icing up if the service door  1  is installed in a cold room. 
     The envelope  24  can equally consist of a cloth  23  produced from an ATEX class fabric enabling use of the service door  1  in areas where there is a risk of explosion. 
     The envelope  24  can equally consist of a cloth  23  produced from an Mo, M1 or M2 class fabric enabling use of the service door  1  in areas where there is a risk of fire. 
     Thus the structure of the vertical uprights  2 ,  3  means that they are quick to install and reduces their weight. 
     Note that the envelope  24  of each modular upright  2 ,  3  can be produced in a cloth  23  that is of exactly the same color as that used for the flexible curtain  6 . 
     It is found that the structure consisting of the assembly of elements constituting each upright  2 ,  3  of the service door  1  makes it very resilient, i.e. highly resistant to impact, because of the elastic deformation of each of its elements. 
     It must furthermore be understood that the foregoing description has been given by way of example only and that it is in no way limiting on the scope of the invention, which would not be exceeded by replacing the details of execution described by any equivalent other such details.

Summary:
A vertical modular mount for a handling door ( 1 ) includes an upper plate ( 18 ) connected to a horizontal frame ( 4 ) and more particularly to a side flange ( 19 ), a lower plate ( 20 ) connected to the ground, a central web ( 21 ) connecting the upper ( 18 ) and lower ( 20 ) plates together, a cloth ( 23 ) arranged around the upper ( 18 ) and lower ( 20 ) plates in order to define an envelope ( 24 ) on the entire height of the mount ( 2, 3 ), and a guiding device ( 15 ) defining a slide for the movement of the flexible screen ( 6 ), characterized in that each of the members ( 21, 23, 15 ) forming the mounts ( 2, 3 ) of the handling door ( 1 ) are arranged so as to impart a high resilience to the latter, i.e. a high resistance to shocks due to the elastic deformation of each of the members.