Page 66 - Wire Rope News & Sling Technology - August 2018
P. 66

continued from previous page                         significantly greater holding force in the crimp. Basically the
                                                              trilobular sleeve provides extra grip length of the rope.
                                                               Thimble 42 which is inserted within the eye splice 40 im-
                                                              proves the holding capacity of the eye splice 40 even further.
                                                              As tension exceeds the holding force of the crimp, the rope
                                                              will slip in the crimp and the eye splice will tighten like a
                                                              noose about the thimble. The noose tightening of the splice
                                                              about the thimble then greatly inhibits the wire rope from
                                                              pulling out from the crimped sleeve channels. Once the noose
                                                              on the thimble 42 is tightened, most the tensile force in the
                                                              rope 30 is transferred to the thimble, the other two chan-
                                                              nels 14, 16 of the crimped sleeve and the bulge created by

         Figure 23: First perspective view of an uncrimped trilobular sleeve.
         ticular eye splice configuration is one example of a rope splice
         which can be used with the sleeve. Other configurations and
         wire splices are also contemplated by the disclosure.
           A second end 39 of the wire rope is fed through sleeve first
         channel 12. Another end 46 of the rope is fed through second
         channel 14 then is looped back or bent and fed through third
         channel 16 and extends through and out of channel 16 as seen
         in figure 23. That is, the other end of the wire rope is a sim-
         ple very tight loop or bend 44 where the rope is looped back
         through the sleeve channel 16 from channel 14. This “loop
         back” is a result of feeding end 46 of the rope 30 through the
         second and third channels 14, 16 in the trilobular sleeve. The   Figure 25: Perspective view of a crimped trilobular sleeve with a loop stop.
         extra length of crimped rope in the third channel provides
                                                              the “loop back” 44 formed by the rope looping back through
                                                              channels  14,  16. By providing three channels to hold the
                                                              rope, this configuration provides significantly better holding
                                                              strength than existing configurations that only provide the
                                                              holding strength of one or two channels.
                                                               Referring now to figure 25, the “loop back” 44 can be lim-
                                                              ited in size by providing an optional loop stop 55. The loop
                                                              stop 55 has a round or circular shape about which the rope is
                                                              wrapped around. That is, the rope is looped from channel 14
                                                              to channel 16 and also around the loop stop 55. This reduces
                                                              the linear displacement of the rope assembly as tension is
                                                              applied. The noose effect that applies to the thimble 42 also
                                                              applies to the “rope loop back” 44.
                                                               Referring now to figure 26, teeth can be added to inner walls
         Figure 24: Second perspective view of an uncrimped trilobular sleeve.  of the sleeve channels in accordance with another aspect of

         66     Wire Rope News & Sling Technology   August 2018
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