Page 64 - Wire Rope News & Sling Technology - August 2018
P. 64

continued from previous page
         wrapping fibers around respective surfaces of the composites
         to provide wires, and twisting the wires together. As is clear
         from figure 21, the carbon fiber composite cable 1 is a seven-
         strand wire formed by twisting seven pieces of wire together,
         and comprises a core wire 2 located at its center, and six
         pieces of surrounding wire 3 wound around the core wire 2.
                                                              Figure 19: Situation in which the terminal metal fitting with the
                                                              terminal of the rope brought back therein is swaged such that the
                                                              large-diameter portion of the terminal metal fitting is pressed to have
                                                              the same diameter as the reference diameter portion of the terminal
                                                              metal fitting.
                                                              side of the proximal end 7, which is continuous with the ref-
                                                              erence diameter portion 23. The large-diameter portion 19 is
                                                              trapezoidal when viewed from the side, and comprises a flat
                                                              outer peripheral surface 20 and tapered portions 21 that are
         Figure  16: Side view illustrating  a  terminal  metal fitting used in   inclined from both axial ends of the outer peripheral surface
         a terminal fixing  method, and shows  a  terminal  of a rope before   in opposing directions to decrease the diameter to connect to
         insertion into the terminal metal fitting.           the reference diameter portion 23. The through hole 11 has
                                                              a constant diameter throughout its length.
                                                               Accordingly, the large-diameter portion 19 is thicker than
                                                              the reference diameter portion 23. The diameter of the large-
                                                              diameter portion 19 is set to have a suitable thickness based
                                                              on an amount of swaging described below, a diameter of the
                                                              carbon fiber composite cable used, and so on. The terminal
                                                              metal fitting 5 is generally formed from a metal such as a
                                                              steel-based, stainless steel-based, or aluminum-based metal
         Figure  17: Situation in which  the terminal  of the rope is inserted   which is plastically deformed by swaging.
         through the terminal metal fitting.
         However, the carbon fiber composite 1 may be formed from
         any preferable number of strand wires  other than seven
         pieces of strand wire, and it may be, for example, a nineteen-
         strand wire or thirty seven-strand wire.
           In the case of the nineteen-strand wire, the carbon fi-
         ber  composite  cable  generally  comprises  the  core  wire,
         six  pieces  of  first  surrounding  wire  twisted  around  the
         core wire, and twelve pieces of second surrounding wire   Figure 20: Partial cutaway view illustrating a situation in which the
         further  twisted  around  the  first  surrounding  wires.  The   large-diameter portion of the terminal metal fitting is reversely
         thirty seven-strand wire additionally comprises eighteen   protruded into the through hole by swaging.
         pieces of third surrounding wire further twisted around
         the twelve pieces of second surrounding wire. In the draw-  In this embodiment, the diameter-enlarging member  31
         ings, the terminal metal fitting discussed in more detail   used for increasing the diameter of the terminal of the rope
         below is designated by reference numeral 5, and a wedge-  is substantially a cone, and comprises a bottom surface 33,
         like diameter-enlarging member is designated by refer-  a truncated conical  surface  35 extending from the bottom
         ence numeral 31. The terminal metal fitting 5 and diame-  surface  toward a tip, and a through  hole  37 extending in
         ter-enlarging member 31 form the terminal fixing tool for   an axial direction, such that it has a wedge-like shape. The
         the carbon fiber composite cable 1.                  through hole  37 preferably has a diameter  identical to or
           The terminal metal fitting 5 is tubular as a whole. A proxi-  slightly larger than the diameter of the core wire 2 of the
         mal opening 15 and a distal opening 17 are formed in a prox-  carbon fiber composite cable 1.
         imal end 7 and a distal end 9, respectively, and a through
         hole (tubular hole) 11 extending in an axial direction com-
         municates the openings 15 and 17 with each other. In this
         embodiment,  the  terminal  metal  fitting  5 has a reference
         diameter portion 23 on the side of the distal end 9 of the ter-
         minal metal fitting, and a large-diameter portion 19 on the









                                                              Figure  21: Enlarged view of the rope, terminal  metal fitting, and
         Figure  18: Situation in which  the terminal  of the rope is inserted   diameter-enlarging member before the insertion of the terminal of
         through the terminal metal fitting.                  the rope into the terminal metal fitting.

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