Page 56 - Wire Rope News & Sling Technology - August 2018
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continued from previous page                          In one embodiment, the plate 105, while restricting move-
         end closest to the anchor. Turning now to figures 3 and 4, fig-  ment of the button  106,  is  sufficiently  sized  to  allow  the
         ure 3 is a perspective view of the sleeve in one embodiment,   comparatively smaller cable 101 to pass. Thus, in one em-
         and  figure  4  is  a  cross-sectional  view  of  the  sleeve  in  one   bodiment the reduced diameter upstream of the plate 105
         embodiment. As can be seen in figure 3, the slot 104 extends   is larger than the diameter of the cable 101. As can be seen
         the entire length of the sleeve 103. Further, shown in hidden   in figure 4, a button 106 can be received and nested in the
         lines is a plate 105. A plate 105 refers to any device which   larger diameter portion downstream of the plate 105. The
         restricts upstream movement of the button 106.       plate  105 will then prevent movement of the button  106
           The plate 105 can comprise an area of reduced diameter,   upstream of the plate 105 but movement of the button 106
         a protrusion, or any other device which prevents movement   downstream will not be restricted.
         of the button, and accordingly the cable 101, upstream. As
         depicted in figures 3 and 4, the plate 105 offers an area of   Elevator cord health monitoring
         reduced diameter to prevent the button 107 from slipping   Pat. 9,862,571 U.S class B66B 7/1223 Int. class B66B 7/06
         upstream of the plate 105. As seen in figure 4, the upstream   Inventor:  Fanping Sun,  Glastonbury,  CT., Xiaodong Luo,
         end comprises a smaller inner diameter than the inner di-  South  Windsor, CT., Daniel  A. Mosher,  Glastonbury,  CT.,
         ameter downstream of the plate  105. The comparatively   Huan Zhang, Glastonbury, CT., John P. Wesson, West Hart-
                                                              ford,  CT., Yan Chen,  South  Windsor,  CT., Mark Steven
                                                              Thompson, Tolland, CT., Raja Kountanya, Manchester, CT.,
                                                              Richard N. Fargo, Plainville, CT.
                                                              Assignee: Otis Elevator Co., Farmington, CT.
                                                               This patent presents a method of fault detection of a belt
                                                              or rope including interconnecting a plurality of cords of the
                                                              belt or rope, the cords including a plurality of wires, to form
                                                              a bridge circuit. A fault detection bridge circuit is subjected
                                                              to a voltage excitation and outputs a voltage which is indica-
                                                              tive of the belt or rope damage but remaining insensitive to
                                                              other environmental noises.
                                                               Shown in figures 5 and 6 are schematics of exemplary trac-
                                                              tion elevator systems  10. Features of the elevator system
                                                              10 that are not required for an understanding of the pres-
         Figure 3:. Perspective view of the sleeve of the cable puller.

         larger inner diameter of the sleeve 103 downstream of the
         plate 105 provides sufficient space in which to nest and re-
         ceive the button 106. Accordingly, in one embodiment, the
         button 106 comprises a diameter which is less than the in-
         ner diameter of the sleeve 103 downstream of the plate 105.
         In one embodiment,  the button  106 comprises a diameter
         which is less than the inner diameter of the sleeve 103 on
         the downstream end 108. Conversely, in one embodiment,
         the button 106 comprises a diameter which is less than the
         inner diameter of the sleeve 103 upstream of the plate 105.
         In one embodiment,  the button  106 comprises a diameter
         which is less than the inner diameter of the sleeve 103 on
         the upstream end 107.
           The depiction of a plate 105 comprising a reduced diameter
         is for illustrative purposes only and should not be deemed
         limiting. In other embodiments the diameter is not reduced   Figure 5: Schematic of an exemplary elevator system.
         upstream of the plate but is instead reduced at the plate.
         The plate 105, in such instances, can comprise a washer, a   ent invention (such as the guide rails, safeties, etc.) are not
         bolt, a screw, or other such protrusion which decreases the   discussed herein. The elevator system 10 includes an eleva-
         diameter at the location of the plate 105 so as to prevent   tor car 12 operatively suspended or supported in a hoistway
         movement of the button 106 upstream of the plate 105.  14 with one or more belts 16 or ropes. The one or more belts
                                                              16 interact with one or more sheaves 18 to be routed around
                                                              various components of the elevator system  10. The one or
                                                              more belts 16 could also be connected to a counterweight 22,
                                                              which is used to help balance the elevator system 10 and re-
                                                              duce the difference in belt tension on both sides of the traction
                                                              sheave during operation. It is to be appreciated that while the
                                                              embodiments herein are described as applied to coated steel
                                                              belts, it is to be appreciated that the disclosure herein may
                                                              similarly be applied to steel ropes, either coated or uncoated.
                                                               The sheaves 18 each have a diameter 20, which may be the
                                                              same or different than the diameters of the other sheaves 18
         Figure 4: Cross-sectional view of the sleeve of the cable puller.  in the elevator system 10. At least one of the sheaves 18 could

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