Page 59 - Wire Rope News & Sling Technology - December 2018
P. 59

INVENTOR’S CORNER
         wound about core strand 28 (not shown in figure 1). Outer   core strand 28. Outer strands 26a-26f and core strand 28
         strands 26a-f and core strand  28 contain nineteen,  heli-  are encased by material 30, which completely encloses wires
         cally wound wires (not shown in figure 1). At least one of   34 contained within core strand 28 and each strand 26a-f.
         outer strands 26a-f and core strand 28 are encased with an   Because each outer strand 26a-f encircles core strand 28,
         electrically-insulating material 30. Optionally, one or more   each  of  strands  26a-f  contacts  core  strand  28.  Moreover,
         outer strands 26a-f and/or core strand 28 can be enclosed   each of outer strands  26a-f contacts two adjacent outer
         with one or more sleeves (e.g., sleeve 32 and/or sleeves 36a-  strands along the outer periphery of wire  rope  12a. For
         f), which  provides additional electrical  insulation,  wear   example, outer strand  26a contacts outer strand  26b and
         resistance, and/or corrosion resistance around electrically-  26f on opposing sides of strand 26a, and outer strand 26a
         insulating material 30.                              contacts core strand 28. Material 30 is electrically-insulat-
           Outer strands 26a-f and core strand 28 are mechanically   ing such that outer strands  26a-f and core strand  28 are
         affixed to lifting hook 16 at free end 13a by first stripping   electrically-insulated from each other along a length of the
         material 30 and/or one or more sleeves from free end 13a.   wire rope between free end 13a and fixed end 13b. With ma-
         Then, outer strands 26a-f and core strand 28 can be attached   terial 30, electrical signals can traverse the length of wire
         to hook 16 by swaging strands 26a-f and core strand 28 to   rope 12a along one of the outer strands 26a-f and/or core
         hook 16 or by other known means. Attaching all strands to   strand 28 without shorting to an adjacent strand. The di-
         hook 16 in this manner results in outer strands 26a-f and   electric strength and wear characteristics of material 30 are
         core strand 28 being electrically connected at free end 13b of   adapted to the electrical signal strength and service of wire
         wire rope 12. Alternatively, pairs can be mechanically joined   rope 12. As such, the electrical and mechanical properties of
         among outer strands 26a-f and core strand 28 to form one or   material 30 are selected for each application of wire rope 12.
         more electrical circuits within wire rope 12. Each electrical-  In some embodiments, material 30 is thermoplastic polyure-
         ly-connected pair of strands is electrically insulated prior to   thane, which has performed well in hoist rope applications.
         affixing hook 16.                                     Although wire rope 12a encases each strand with material
           At fixed end 13b, material 30 and/or one or more sleeves   30, electrically-insulating each outer strand 26a-f and core
         are stripped from strands 26a-f and core strand 28 before   strand 28 with material 30 is not necessary to transmit elec-
         affixing to drum 14. The connections of each outer strand   trical signals through wire rope 12a. At a minimum, encas-
         26a-f  and  core  strand  28  are  electrically-insulating  from   ing one wire 34 with material 30 electrically isolates one of
         each other at  drum  14 to facilitate sending and receiving   wires 34 from the remaining wires 34, outer strands 26a-f,
         electrical signals through wire rope 12.             and core strand 28. In this way, an electrical signal can be
           Figure  2 is a cross-sectional  view of wire  rope  12a tak-  transmitted through the electrically-insulated wire 34 and
         en along line 2-2 in figure 1. Wire rope 12a includes outer   received through the remaining wires and strands or vice
         strands  26a,  26b,  26c,  26d,  26e,  and  26f  which  encircle                      continued on next page















































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