Page 61 - Wire Rope News & Sling Technology - August 2018
P. 61

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         relative to the electrically connecting sheave 22. The wire   ing sheave 22 is electrically conductive, and thus the contact
         ropes 12, 14, 16, 18 each include a monitored portion 34 that   portions 32 of the wire ropes 12, 14, 16, 18 are electrically
         extends between the first end portion 28 and the contact por-  connected to one another because they are in contact with
         tion 32. The portion of the wire rope 12, 14, 16, 18 that is the   the electrically connecting sheave 22. In other embodiments,
         monitored portion 34 changes as the wire ropes 12, 14, 16,   the electrically connecting sheave 22 may not be electrically
         18 are moved relative to the electrically connecting sheave   conductive, but the electrically connecting sheave  22 may
         22.  The  system  10  monitors  an  electrical characteristic of   cause the contact portions 32 of the wire ropes 12, 14, 16,
         the monitored portions 34 of the wire ropes 12, 14, 16, 18.  18 to physically touch one another, thereby electrically con-
           The electrically connecting sheave 22 electrically connects   necting them. In figure 14, for example, the electrically con-
         the contact portions 32 of the wire ropes 12, 14, 16, 18 to   necting sheave 22 includes a plurality of grooves 36, 38, 40,
         one another. In some embodiments, including the embodi-  42 that receive the contact portions 32 of the wire ropes 12,
         ments illustrated in figures 11-13, the electrically connect-  14, 16, 18. The grooves 36, 38, 40, 42 are configured so that,
                                                              when the contact portions 32 of the wire ropes 12, 14, 16, 18
                                                              sit within the respective grooves 36, 38, 40, 42, the contact
                                                              portions 32 of adjacent wire ropes 12, 14, 16, 18 physically
                                                              touch one another.
                                                               In embodiments  that include  electrically  non-connecting
                                                              sheaves 27, 29, 31, the electrically non-connecting sheaves
                                                              27, 29, 31 do not electrically connect the wire ropes 12, 14,
                                                              16,  18 to one another. In some embodiments, the electri-
                                                              cally non-connecting sheaves 27, 29, 31 may be electrically
                                                              non-conductive. In some embodiments, the electrically non-
                                                              connecting sheaves 27, 29, 31 physically separates the wire
                                                              ropes 12, 14, 16, 18 from one another when they contact the
                                                              electrically non-connecting sheaves 27, 29, 31. The hoisted
                                                              object 20 can be any object capable of being hoisted. In the
                                                              embodiments illustrated in figures 11-13, the hoisted object
                                                              20 is an elevator car. The system 10 includes a controller
                                                              44. In some embodiments, the system 10 may additionally
                                                              include a connector 46, a location sensing device 48, and/or a
                                                              rope contact sensing device 50.
         Figure 12: Schematically  illustrates another view of the system for   The controller 44 is selectively electrically connected, di-
         positioning wire ropes.                                                              continued on next page

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