Abstract:
A cableway system has a carrying and conveying cable on which transportation devices, such as chairs or gondolas, are carried on load-bearing bars. The latter can be fastened with clamps and they are guided, in the stations, over reversing pulleys. Between the stations, the cable is guided over supporting rollers and beneath hold-down rollers. A first strand of the cable is guided over a group of deflecting rollers or the like and a second strand is guided over at least one deflecting drum along a angled portion of the travel path. The deflecting drum is rotated continuously by the carrying and conveying cable and it is formed with a plurality of circumferentially distributed recesses which accommodate the load-bearing bars for the transportation devices as they are moved past the deflecting drum.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims the priority, under 35 U.S.C. §119, of Austrian patent application A 2048/2007, filed Dec. 17, 2007; the prior application is herewith incorporated by reference in its entirety. 
       BACKGROUND OF THE INVENTION 
     Field of the Invention 
       [0002]    The present invention relates to a cableway system having a carrying and conveying cable on which transportation devices, such as lift chairs or gondolas that are supported on load-bearing bars can be fastened by means of clamps. The cable is guided, in the stations, over reversing pulleys. At least one of the pulleys is driven. Furthermore, the cable is guided, between the stations, over supporting rollers and beneath holding-down rollers, it being the case that a first strand of the carrying and conveying cable is guided in each case over at least one deflecting pulley or over a group of deflecting rollers and a second strand is guided over at least one deflecting drum, which is formed with at least one recess for accommodating the load-bearing bar of one of the transportation devices, whereby the two strands can be moved along a path having at least one angled portion. 
         [0003]    Conventional cableway systems have a carrying and conveying cable to which transportation devices, such as chairs and gondolas, are clamped. The transportation devices here either are firmly clamped to the carrying and conveying cable or are clamped in a releasable manner, it being the case that the transportation devices, in the stations, are uncoupled from the carrying and conveying cable and moved through these stations at a speed which is substantially reduced in relation to the speed of the carrying and conveying cable, as a result of which passengers can board the transportation devices or disembark therefrom. The transportation devices are fastened on the carrying and conveying cable by clamping means which, at one of the two ends, are formed with clamping jaws and have the top region of a load-bearing bar fastened at their other end, a transportation device being located at the bottom end of the load-bearing bar. 
         [0004]    The carrying and conveying cable is guided, in the stations, over deflecting pulleys, of which at least one is a driven pulley. Furthermore, over the course taken by the cableway system, the carrying and conveying cable is retained by means of supporting rollers and guided through beneath holding-down rollers. The clamping means and the load-bearing bars, in respect of the cable-deflecting pulleys, are each located laterally outside the carrying and conveying cable, this making it possible for the carrying and conveying cable, with transportation devices firmly clamped thereto, to be guided over the deflecting pulleys located in the stations. 
         [0005]    The topography of the terrain in which a cableway system is erected would often make it expedient for the path of this cableway system to be formed with at least one angled portion. As far as a first strand of the carrying and conveying cable is concerned, it is possible for the strand to be guided around at least one deflecting pulley, or over a group of deflecting pulleys, against which the inside of this strand of the carrying and conveying cable ends up in abutment, as a result of which the path may be provided with an angled portion. However, it is only possible to have one such angled portion, in the case of which the inside of the carrying and conveying cable butts against the deflecting pulley, since the load-bearing bars for the transportation devices, which cannot be moved over the prior-art deflecting pulleys, are located on the outside of the carrying and conveying cable. 
         [0006]    Even if to be precise one of the two strands of the carrying and conveying cable is guided along a path formed with at least one angled portion, the fact remains that, on account of the load-bearing bars located on the outside of the carrying and conveying cable, it is not possible for the second strand to be guided along a path running more or less parallel to the first strand. Rather, it is then necessary for the second strand to be guided along a path which deviates from that of the first strand. Such a cableway system, however, is very disadvantageous insofar as, on the one hand, it requires more or less double the number of supports and, on the other hand, the amount of surface area required is substantially increased. For both these reasons, cableway systems which run over a rectilinear path are usually erected. 
         [0007]    European patent EP 556 139 B1 discloses an aerial cableway system of chairs which is formed with a deflecting arrangement which is intended to solve this problem. This deflecting arrangement comprises a deflecting pulley which is formed, on the one hand, with a recess for accommodating a load-bearing bar and, on the other hand, with a plurality of deflecting rollers. As long as there is no load-bearing bar for a chair located on the carrying and conveying cable, this deflecting pulley is located in a predetermined rotary position and the carrying and conveying cable is guided over the deflecting rollers. As soon as a load-bearing bar approaches, the deflecting pulley is made to rotate, the carrying and conveying cable coming into direct abutment with this deflecting pulley and the load-bearing bar for the relevant chair being accommodated by the recess located therein. The deflecting pulley is then rotated into its starting position, in which it is retained until the next load-bearing bar arrives. 
         [0008]    The prior art configuration is disadvantageous for a number of reasons: Since the carrying and conveying cable is guided over a multiplicity of deflecting rollers of a very small diameter, the carrying and conveying cable experiences very high levels of compressive loading, as a result of which it is subjected to pronounced wear. In addition, these deflecting rollers give rise to high maintenance outlay, they are very susceptible to malfunctioning and they cause pronounced levels of noise. Furthermore, the design of this deflecting arrangement necessitates a minimum spacing between the successive load-bearing bars. In addition, this deflecting pulley has to be assigned a drive motor to rotate it out of the rest position. Finally, it is not possible, in the case of this deflecting arrangement for the carrying and conveying cable to be moved counter to the normal conveying direction. 
       SUMMARY OF THE INVENTION 
       [0009]    It is accordingly an object of the invention to provide an aerial cableway system with a carrying ad/or conveying cable which overcomes the above-mentioned disadvantages of the heretofore-known devices and methods of this general type and which provides for a cableway system that follows a path of at least one angled portion, but avoids the disadvantages that are inherent in prior art cableway systems of this type. 
         [0010]    With the foregoing and other objects in view there is provided, in accordance with the invention, a cableway system, comprising: 
         [0011]    a carrying and conveying cable extending between stations, and transportation devices (e.g., chairs, gondolas) supported thereon by way of load-bearing bars that are selectively fastened to said cable by means of clamps; 
         [0012]    reversing pulleys, including at least one driven pulley, for guiding said carrying and conveying cable in the stations; 
         [0013]    at least one deflecting drum and a plurality of supporting rollers and holding-down rollers disposed to guide said carrying and conveying cable between the stations; 
         [0014]    said carrying and conveying cable extending along a first strand guided over a group of deflecting rollers and along a second strand guided over said deflecting drum, to commonly move along a path having at least one angled portion; 
         [0015]    said deflecting drum being rotated continuously by said carrying and conveying cable, and having a plurality of circumferentially distributed recesses formed therein for accommodating respective said load-bearing bars of said transportation devices as said transportation devices are moved past said deflecting drum. 
         [0016]    In other words, the objects of the invention are achieved in that the deflecting drum, which is assigned to the second strand and is rotated continuously by the carrying and conveying cable, is provided with a plurality of circumferentially distributed recesses which accommodate the load-bearing bars for the transportation devices as they are moved via this deflecting drum. The deflecting drum, which is provided with circumferentially distributed recesses, is preferably formed with a conical lateral surface, and an actuator, by means of which it is possible to adjust the height position of the deflecting drum, is provided. Furthermore, groups of supporting and holding-down rollers are preferably provided, over the course of the second strand of the carrying and conveying cable, upstream and/or downstream of the deflecting drum and retain the second strand in a predetermined height position. As an alternative to this, it may not be possible to adjust the height position of the deflecting drum, and the carrying and conveying cable may be assigned at least one guide roller which can be adjusted in height by means of an actuator and by way of which the carrying and conveying cable can be adjusted in height in relation to the deflecting drum. 
         [0017]    According to further-preferred embodiments, the deflecting drum is assigned at least one measuring device which can sense a transportation device approaching the deflecting drum, and further provided is a control means, which can control the actuator for the deflecting drum and/or for the at least one guide roller. Furthermore, the deflecting drum may also be formed with a measuring device which can establish the rotary position of the deflecting drum and of which the starting signals are likewise passed on to the control means. Finally, it is also possible for the actuator to be assigned a measuring device which can establish the height position of the deflecting drum and/or of the at least one guide roller for the carrying and conveying cable and of which the starting signals are likewise passed onto the control means. 
         [0018]    Further measuring devices for monitoring and/or additional control purposes are also provided. 
         [0019]    Other features which are considered as characteristic for the invention are set forth in the appended claims. 
         [0020]    Although the invention is illustrated and described herein as embodied in cableway system having a carrying and conveying cable, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims. 
         [0021]    The construction and method of operation of the invention, however, together with additional objects and advantages thereof will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING 
         [0022]      FIG. 1  is a top perspective view of a part of a cableway system according to the invention; 
           [0023]      FIG. 2  is a plan view onto the part of the cableway system shown in  FIG. 1 ; 
           [0024]      FIG. 3  shows a constituent part of this cableway system as seen in the direction of the arrow A in  FIG. 2 ; 
           [0025]      FIG. 4  shows a plan view of that constituent part of the cableway system which is shown in  FIG. 3 , on an enlarged scale in relation to  FIG. 3 ; 
           [0026]      FIG. 5  is a perspective view of a detail from  FIG. 4 ; and 
           [0027]      FIGS. 6 ,  6 A, and  6 B are schematic plan views illustrating the movement sequence of the transportation devices in respect of a height adjustment of the deflecting drum. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0028]    Referring now to the figures of the drawing in detail,  FIGS. 1 ,  2 , and  3  illustrate part of the cableway system which is formed with an angled portion. This cableway system has a carrying and conveying cable  1  which, in the stations, is guided over reversing pulleys or return pulleys. Spaced-apart chairs  2  are coupled to the carrying and conveying cable  1  by way of load-bearing bars  21 . The chairs  2  which are coupled to the strand  1   a  moving toward the mountain station here are occupied by passengers, whereas, the chairs  2  which are coupled to the strand  1   b  moving toward the valley station are unoccupied. In order for the route to be angled, a plurality of supports  3  are provided, and these have mounted on them a number of groups of deflecting rollers  4  against which the strand  1   a  moving toward the mountain station ends up in abutment, as a result of which this strand is deflected to the right as it moves toward the mountain station. This is possible since the load-bearing bars  21  for the chairs  2  are located on the outside of the strand  1   a , whereas the inside of this strand ends up in abutment against the deflecting rollers  4 . 
         [0029]    In order for it also to be possible for the strand  1   b  moving toward the valley station to be deflected correspondingly, a deflecting drum  6 , which has a plurality of equally spaced-apart recesses  61  over its circumference, is located on a load-bearing framework  5 . These recesses  61  are necessary since the load-bearing bars  21  are allocated on that side of the carrying and conveying cable  1  which ends up in abutment against the deflecting drum  6 . It must also be ensured here that, as a chair  2  arrives, the deflecting drum  6  is located in a position which allows the load-bearing bars  21  of the relevant chairs  2  to be accommodated by one of the recesses  61 . 
         [0030]    In order to achieve this, the outer surface of the deflecting drum  6  is conical, this conical surface tapering downward, and it is also possible for the deflecting drum  6  to be adjusted in height by means of an actuator. For this purpose, the deflecting drum  6  is mounted on a height-adjustable load-bearing beam  51  such that it can be rotated about a vertical axis. Furthermore, the deflecting drum  6  is assigned groups of supporting and holding-down rollers  7 , which retain the strand  1   b  of the carrying and conveying cable  1  in a predetermined height position. The deflecting drum  6  is additionally assigned a first sensor  81 , which detects the passage of a load-bearing bar  21 . The output signal of this sensor  81  is supplied to a control unit which, taking account of the rotary position of the deflecting drum  6  at this point in time, calculates the height position in which the conical deflecting drum  6  has to be located in order to ensure that the next load-bearing bar  21  to arrive is accommodated by one of the recesses  61  of the deflecting drum  6 . A second sensor  82 , which is located at a small distance from the deflecting drum  6 , is provided for monitoring purposes. In addition, a third sensor  83  is located downstream of the deflecting drum  6 , and this sensor, following the passage of the relevant load-bearing bar  21 , releases the actuator again for the height adjustment of the deflecting drum  6 . 
         [0031]    Since the lateral surface of the deflecting drum  6 , on account of the conicity of the latter, has different diameters in different height positions, the height adjustment of the deflecting drum results in a change in the distance of the recesses  61  from a load-bearing bar  21  located on the carrying and conveying cable  1 , and this distance can be adjusted such that the approaching load-bearing bar  21  passes into one of the recesses  61  of the deflecting drum  6 . 
         [0032]    The load-bearing beam  51 , on which the deflecting drum  6  is mounted, is adjusted by means of two actuating cylinders  9 , which can be seen from  FIG. 3  in particular. Furthermore, four telescopic guides  9   a  are located between the load-bearing framework  5  and the load-bearing beam  51 . Also located between the load-bearing arrangement  5  and the load-bearing beam  51  are four measuring devices  84 , which can sense the height position of the deflecting drum  6  and of which the output signals are likewise passed onto the control unit. 
         [0033]    It can also be seen from  FIG. 4  that the deflecting drum  6  is formed with a fifth measuring unit  85 , which establishes the rotary position of the deflecting drum  6  and of which the output signals are likewise supplied to the control unit. 
         [0034]      FIG. 5  shows the design of the deflecting drum  6 . As can be seen, the deflecting drum  6  is formed with a hub  62  which has radially running web plates  63  extending from it, a respective recess  61  for accommodating the load-bearing bars  21  of the chair  2  being located between two associated web plates  63 . It can also be seen that the outer lateral surface  64  tapers conically downward. The conicity of the deflecting drum  6  is approximately 17°. Depending on the height position of the deflecting drum  6 , the abutting strand of the carrying and conveying cable  1  is located in different regions of the lateral surface  64 , top regions of the lateral surface  64  being at greater radial spacings from the axis of rotation than bottom regions of the lateral surface  64 . The lateral surface  64  of the deflecting drum  6  is formed with a rubber support. 
         [0035]    The function of this deflecting drum  6  will be described herein below with reference to  FIGS. 6 ,  6 A and  6 B: 
         [0036]    The strand  1   b  of the carrying and conveying cable  1 , a load-bearing bar  21 , the deflecting drum  6 , which is formed with recesses  61 , and the three sensors  81 ,  82  and  83  are illustrated schematically in  FIGS. 6 ,  6 A and  6 B. 
         [0037]    In  FIG. 6 , the load-bearing bar  21  is located in the region of the first sensor  81 , as a result of which the distance of this load-bearing bar  21  from the axis of rotation of the deflecting drum  6  is determined. By way of the output signal emitted by the first sensor  81 , and taking account of the rotary position of the deflecting drum  6  at this point in time, this rotary position being determined by the fifth sensor  85 , the control unit calculates the height position at which the conical deflecting drum  6  has to be located in order for the load-bearing bar  21  moving in the direction of the deflecting drum  6  to pass into one of the recesses  61  of the deflecting drum  6 . 
         [0038]    In  FIG. 6A , this load-bearing bar  21  is located in the region of the second sensor  82 , which emits to the control means a signal which, by way of the control unit, results in the rotary position of the deflecting drum  6  being checked to the effect that this load-bearing bar  21  passes into one of the recesses  61  of the deflecting drum  6 . If this is not ensured, the cableway system is switched off. As a result, there is no further height adjustment of the deflecting drum  6  at this moment in time. 
         [0039]    Once the load-bearing bar  21  has been accommodated by one of the recesses  61  on the deflecting drum  6 , has been advanced by this deflecting drum and has left the recesses  61  again, it passes into the region of the third sensor  83 , by means of which an output signal is emitted to the control unit to the effect that a height adjustment of the deflecting drum  6  can then be effected again in order thus to allow the necessary height adjustment for the load-bearing bar  21  of a further chair  2 . 
         [0040]    As an alternative to this, it may not be possible to change the height position of the deflecting drum  6 , the carrying and conveying cable being assigned at least one guide roller which can be adjusted in height by means of an actuator and by way of which the carrying and conveying cable can be adjusted in height in relation to the conical deflecting drum  6 . This too achieves the necessary control to the effect that the load-bearing bar  21  moving in the direction of the deflecting drum  6  passes into one of the recesses  61  of the deflecting drum  6 . 
         [0041]    These control means ensure that the load-bearing bars  21  for chairs  2  moving in the direction of the deflecting drum  6  always pass into one of the recesses  61  of the deflecting drum  6 . As a result, it is also possible for the second strand  1   b  of the carrying and conveying cable  1  to be deflected in a manner analogous to the first strand  1   a  of the carrying and conveying cable  1 . 
         [0042]    Such an arrangement thus makes it possible to erect cableway systems with any desired number of angled portions in any desired directions, as a result of which the course taken by the cableway systems can be adapted to any topographical conditions. In the case of such a cableway system, it is additionally possible to change the movement direction, i.e. reverse movements can also be carried out. 
         [0043]    Such an arrangement may also be provided in a cableway system having a stationary carrying cable and a pulling cable, the pulling cable being guided over the deflecting drum, which is formed with recesses.