Page 51 - Wire Rope News & Sling Technology
P. 51

suited to the purpose than a filler. The coating of the steel
                                                              wire rope may also be so implemented that the coating mate-
                                                              rial penetrates partially into the rope or through the entire
                                                              thickness of the rope, giving the rope the same properties as
                                                              the filler mentioned above. The use of thin and strong steel
                                                              wire ropes according to the invention is possible because the
                                                              steel wires 403 used are wires of special strength, allowing
                                                              the ropes to be made substantially thin as compared with
                                                              steel wire ropes used before.
                                                               The ropes presented in figures 4 and 5 are steel wire ropes
                                                              having a diameter of about 4 mm. For example, when a 2:1
                                                              suspension ratio is used, the thin and strong steel wire ropes
                                                              of the invention preferably have a diameter of about 2.5 mm
                                                              - 5 mm in elevators for a nominal load below 1,000 kg, and
          Figure 6: Third steel wire rope used in the invention.
                                                              preferably about 5 mm - 8 mm in elevators for a nominal
         possible to achieve a machine weight even as low as about   load above 1,000kg. In principle, it is possible to use ropes
         one half of the weight of currently  used machines, which   thinner than this, but in this case a large number of ropes
         means producing elevator machines weighing 100-150 kg or   will be needed. Still, by increasing  the suspension  ratio,
         even  less.  In  the  invention,  the  machine  is  understood  as   ropes thinner than those mentioned above can be used for
         comprising at least the traction sheave, the motor, the ma-  corresponding loads, and at the same time a smaller and
         chine housing structures and the brakes.             lighter elevator machine can be achieved.
           Figures  4-6 present longitudinal cross-sections  of steel
         wire ropes used in the invention. The ropes in these figures   Twistable security cable
         contain thin steel wires 403, a coating 402 on the steel wires   Pat.  9,470,021  U.S.  class  E05B  73/0005  Int.  class  E05B
         403 and/or partly between the steel wires 403 and, in figure   67/00
         4, a coating 401 over the steel wires 403. The rope presented   Inventor: Daniel Hugh Kindstrand, Pembroke, MA., Donald
         in figure 5 is an uncoated steel wire rope with a rubber-like   H. Warren, Natick, MA.
         filler added to its interior structure, and figure 5 presents a   Assignee: Schlage Lock Company, Indianapolis, IN.
         steel wire rope provided with a coating in addition to a filler   A twistable security cable including a cable and a coupling
         added to the internal structure. The rope presented in figure   device is presented. The cable includes a central core, two
         6 has a non-metallic core 404, which may be a solid or fi-  or more wire groups positioned about the central core, and
         brous structure made of plastic, natural fiber, or some other   an outer coating. The central core is structured to retain a
         material suited for the purpose. A fibrous structure will be   shape to which it is deformed, and each of the wire groups
         good if the rope is lubricated, in which case lubricant will   includes two or more braided or twisted wires. The coupling
         accumulate in the fibrous core. The core thus acts as a kind   mechanism is structured to selectively retain first and sec-
         of  lubricant  storage.  The  steel  wire  ropes  of  substantially   ond ends of the cable in close proximity to one another.
         round cross-section used in the elevator of the invention may   With reference to figure 7, an exemplary coated cable 210
         be coated, uncoated, and/or provided with a rubber-like fill-  according to one embodiment includes a wire rope 212 and
         er, such as, e.g., polyurethane or some other suitable filler,   a protective coating 214 formed of a material such as, for
         added to the interior structure of the rope and acting as a   example, a vinyl material. The wire rope 212 includes a cen-
         kind of lubricant lubricating the rope and also balancing the   tral core 216 and a plurality of wire groups 217 surrounding
         pressure between wires 403 and strands 405.          the central core 216. Each of the wire groups 217 includes
           The use of a filler makes it possible to achieve a rope that   several individual wires 218 which are braided or twisted
         needs no lubrication, so its surface can be dry. The coating   together. The wire groups 217 are in turn braided or twisted
         used  in  the  steel  wire  ropes  may be  made of  the  same or   about the central core 216. In the illustrated embodiment,
         nearly the same material as the filler or of a material that   each of the outer wire groups 217 includes a number of wires
         is better suited for use as a coating and has properties, such   218 arranged in three concentric layers. It is also contem-
         as friction and wear resistance properties, that are better   plated  that the outer wire  groups  217 could include any
                                                                                               continued on next page


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