Abstract:
A moving walkway or escalator includes a handrail and a guide for the handrail. The handrail is driven by motor and moved along the longitudinal axis thereof at or on the guide. The handrail is guided at or on the guide along an arcuate portion of the guide while rotated or twisted about the longitudinal axis thereof, so that it can be guided more easily around curves of the moving walkway.

Description:
BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The invention relates to a balustrade for a moving walkway or an escalator, having a handrail and a guide for the handrail, on which guide the handrail is moved along its longitudinal axis by motor drive. 
     Moving walkways and escalators which run not only over straight sections, but also over sections which can run in a horizontal plane around bends are known. It is also possible for moving walkways to be arranged not only in horizontal planes, but also in ascending or descending planes, possibly also with curved transitions between ascending or descending planes and horizontal planes. In escalators also, a transition is made between an ascending or descending transport plane into a horizontal plane. When reference is hereinafter made to a transport plane, both horizontal planes and ascending or descending planes and their transitions to horizontal planes are understood. Furthermore, when reference is hereinafter made to a moving walkway, then this applies equally to escalators insofar as these have in some portion of their transport path a bending or curvature which also includes a horizontal component. 
     A problem with moving walkways is that the handrail generally has a substantially higher stiffness in a plane parallel to the transport plane than in the vertical plane, since handrails, at the end of the balustrade, are normally diverted arcuately downward and can thus easily be bent in this direction or in this plane, whereas, in a plane parallel to the transport plane, they can be bent only with difficulty, or not at all, due to their geometric shape and their structure. 
     BRIEF SUMMARY OF THE INVENTION 
     The object of the invention is therefore to provide a balustrade having a handrail for a moving walkway, which balustrade is guided in a plane parallel to the transport plane, following the path of the moving walkway or escalator, around an arcuate portion. 
     In a balustrade of the type stated in the introduction, this object is achieved by virtue of the fact that the handrail is guided on the guide, twisted about its longitudinal axis along an arcuate portion of the guide. 
     Since the handrail is twisted about its longitudinal axis when the balustrade, following the moving walkway, is guided in a plane parallel to the transport plane, its stiffness is less in the plane parallel to the transport plane than if it were not twisted about its longitudinal axis, so that the handrail can more easily follow the arcuate portion of the guide and no complex measures have to be taken to reduce the stiffness of the handrail in the plane parallel to the transport plane to the point where said handrail can be guided around the arcuate portion of the guide. 
     It is preferred in the invention if the handrail is guided on the guide such that it is rotated through an angle of at least 45°, preferably through an angle of 75°, 80°, 85° or, in particular, 90°, about its longitudinal axis. The handrail is thereby bent, in particular at an angle of rotation of 90°, in the arcuate portion of the guide in the same plane as this is usually done at the end of the balustrade when a handrail is guided arcuately downward, so that a conventional handrail can be used. 
     It is preferred in the invention if the handrail is guided on the guide on a straight portion of the guide on the top side of the balustrade, and on an arcuate portion of the guide on that side of the balustrade which lies opposite that side to which the arcuate portion of the guide is bent. In this case, the handrail is disposed in a bend of the moving walkway on the outer side of the balustrade, that is to say on the side which is facing away from the center of curvature of the bend. 
     Alternatively, it is also possible in the invention that the handrail is guided on the guide on a straight portion of the guide on the top side of the balustrade, and on an arcuate portion of the guide on that side of the balustrade to which the arcuate portion of the guide is bent. The handrail is thus disposed in a bend of the moving walkway on the inner side of the balustrade, that is to say on the side which is facing toward the center of curvature of the bend. 
     In the invention, it is equally possible, however, that the handrail is guided on the guide on a straight portion of the guide on the top side of the balustrade, and on arcuate portions of the guide, which are bent on opposite sides, on correspondingly opposite sides. According to requirement, the handrail is thus disposed in one instance on the inner side and in another instance on the outer side or the top side of the balustrade. 
     As is known from the prior art, the handrail, in the invention, can be guided at the end of a balustrade, on the top side of the balustrade, articulately downward on the guide. It can also however be bent at the end of the balustrade, as described above, in a plane parallel to the transport plane through 180° and can be guided, for example, to a moving walkway running in the opposite direction. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING 
       Further features and advantages of the invention emerge from the following description of preferred illustrative embodiments of the invention with reference to the attached drawings, wherein: 
         FIG. 1  shows a moving walkway having an inventive balustrade in a first embodiment, 
         FIG. 2  shows a moving walkway having an inventive balustrade in a second embodiment, 
         FIG. 3  shows a handrail in a first position, 
         FIG. 4  shows a handrail in a second position, and 
         FIG. 5  shows a handrail in a third position. 
     
    
    
     DESCRIPTION OF THE INVENTION 
     In  FIG. 1  is represented a moving walkway  1 , which travels in an, in the represented embodiment, horizontal transport plane  2  around a plurality of bends  3 ,  4 ,  5 ,  6  between which are found straight transport sections  7 ,  8 ,  9 ,  10 . As is known per se, the moving walkway  1  consists of a multiplicity of roughly sickle-shaped plates, which are connected to one another such that they can travel both around bends  3 ,  4 ,  5 ,  6  and along straight transport sections  7 ,  8 ,  9 ,  10 . 
     Along the moving walkway  1  is arranged a balustrade  11  having a handrail  12 , which balustrade follows the path of the moving walkway  1 , persons being able to hold on to the handrail  12 , which is moved at the same speed as the moving walkway  1 , as they are transported on the moving walkway  1 . 
     As can be seen in the illustrative embodiment of  FIGS. 3 to 5 , the handrail  12  has a substantially C-shaped cross section having a flat spine  13  and arm ends  14  which are bent toward each other. On the spine  13  is disposed a rib  15  running in the longitudinal direction of the handrail  12 , which rib is directed toward the inside of the C-shaped cross section. In this illustrative embodiment, the handrail is guided on a roughly Y-shaped guide  16  having a groove  18  which is disposed between arms  17  and in which the rib  15  of the handrail  12  is guided. The arms  17  of the guide  16  are embraced by the bent-over arm ends  14  of the handrail  12 . 
     As  FIG. 4  shows, the guide  16 , disposed on the top side of the balustrade  11 , can point upward, whereby the handrail  12  is disposed on the top side of the guide  16  and thus of the balustrade  11 . According to the invention, this position of the handrail  12  is used preferably for rectilinear transport sections, for example the transport sections  7 ,  8 ,  9 ,  10  according to  FIGS. 1 and 2 . 
     Since the handrail  12 , in a plane  19  lying parallel to the transport plane  2 , can be bent only with difficulty, or not at all, it would be difficult to travel with the handrail  12  around bends  3 ,  4 ,  5 ,  6 . According to the invention, the handrail  12  is therefore twisted along its longitudinal axis, in the illustrative embodiment according to  FIG. 3  through 90° to the left and in the illustrative embodiment according to  FIG. 5  through 90° to the right. In the position according to  FIGS. 3 and 5 , the handrail  12  can easily be bent in the plane  19 , so that it is also possible with the handrail  12  to follow the bends  3 ,  4 ,  5 ,  6 . Depending on the shape of the handrail  12 , it would theoretically also be possible to rotate the handrail  12  not through 90° , but through an angle less than 90° , for example only 45° , 75° , 80° or 85° , since the stiffness of the handrail  12  in the direction of the plane  19  is then already less than in the position according to  FIG. 4 . In the invention, a twisting of the handrail through 90° is however preferred. 
     The handrail  12  could, for example, assume the position according to  FIG. 3  in the region of the bends  4  and  6  of  FIG. 1 , whereby the handrail is disposed, so to speak, on the outer side of the balustrade  11 , i.e. on the side facing away from the center of curvature of the bend  4 ,  6 , and the position according to  FIG. 5  in the region of the bends  3  and  5  of  FIG. 1 , wherein the handrail is disposed in the bend  5 , so to speak, on the inner side of the balustrade  11 , i.e. on the side facing toward the center of curvature of the bend  5 , and in the bend  3  back on the outer side of the balustrade. On at least one bend  3 ,  4 ,  5 ,  6 , the handrail  12  is preferably disposed on an outer side, since it can then, for example, very easily be motor driven by means of a V-belt wheel. 
     In  FIG. 2 , at the end of the balustrade  11  (in the region of the bends  4  and  6 ), the handrail  12  is guided arcuately downward on the guide  16 , as is known per se from the prior art, so that, on its guide  16 , it maintains its position on the balustrade  11  substantially as represented in  FIG. 4  when leaving a straight transport section  7 ,  8 ,  9 ,  10 , in which it, as described above, preferably likewise assumes the position represented in  FIG. 4 , or entering said transport section. In comparison to the embodiment according to  FIG. 1 , the handrail  12  could then, for example, assume only the positions according to  FIGS. 4 and 5 , but not that according to  FIG. 3 . 
     If the moving walkway  1  not only runs in a horizontal plane  2 , as in the illustrative embodiments represented in  FIGS. 1 and 2 , but passes from a horizontal plane into an inclined plane, and in this transition region a bend is possibly present, then in this transition region or bend region it is advantageous if the handrail  12  is rotated not through 90°, but through an angle less than 90° about its longitudinal axis, the spine  13  of the handrail  12  is thus rotated through an angle between 0° and 90°, since the optimal bending plane of the handrail  12  can then be adapted to the curvature of the path of conveyance and thus of the guide  16 .