Page 58 - Wire Rope News & Sling Technology - December 2018
P. 58

Inventor’s


                      Corner



                         By William Fischer


         Thank you for your interest  in the
         December issue of Inventor’s Corner. It
         is the holiday season, and we here at
         Wire  Rope News  & Sling  Technology
         would like to wish all our readers  a
         great holiday, and hope you all can look
         forward to a wonderful new year.



         Aircraft rescue hoist rope designed for continuous in-
         spection
         Pat. 10,001,452  U.S.. class B64D 1/22  Int. class G01N 27/20
         Inventor: William A. Veronesi, Hartford, CT., Mauro J. Atal-
         la, Wake Forest, NC.
         Assignee: Goodrich Corporation, Charlotte, NC.
           A method of making a hoist cable capable of continuous
         resistance monitoring includes applying an electrically-insu-
         lating material to at least one strand of a wire rope such that
         a length of the strand is electrically insulated and an end
         of the strand is electrically conductive. The end of at least
         one strand is joined to other strands of the wire rope such
         that at least two strands are electrically connected at a free
         end of the wire rope. A method of inspecting the hoist cable
         includes transmitting a first electrical signal through a first
         strand from a hoist drum to a free end of the wire rope and
         receiving the first electrical signal through a second strand
         at the hoist drum, the first and second strands being elec-
         trically connected at the free end. Using the first electrical   Figure 2: Cross-sectional view showing a wire rope having electrically-
                                                              insulated strands.
         signal, the resistance of the wire rope is calculated.
           Figure  1 is  a schematic  view of hoist  system  10,  which   rope  12  is  mechanically  coupled  to  lifting  hook  16  at free
         includes wire rope 12, drum 14, and lifting hook 16. Wire   end 13a and anchored to drum 14 at fixed end 13b. Drum 14
                                                              is generally cylindrical and configured to rotate about axis
                                                              18. Drum 14 can be supported by any suitable means that
                                                              facilitates rotation of drum 14 about axis 18. For example,
                                                              drum 14 can be affixed to shaft 20 and supported at oppos-
                                                              ing axial ends by supports 22a and 22b in which shaft 20
                                                              engages supports  22a and  22b at bearings  24a and  24b,
                                                              respectively. Supports 22a and 22b are attached to a sup-
                                                              porting structure (not shown in figure 1), and in some em-
                                                              bodiments, supports 22a and 22b are attached to a vehicle
                                                              such as a helicopter. Drum 14 has outer surface 14a, which
                                                              is configured to deploy and retract wire rope 12 when drum
                                                              14 is driven by a motor or other suitable means. Thus, when
                                                              drum 16 rotates about axis 18 in a first direction, wire rope
                                                              12 deploys whereas when drum 16 rotates about axis 18 in
                                                              a second direction that is opposite the first direction, wire
                                                              rope 12 retracts. As such, when a load engages lifting hook
                                                              16, wire rope 12 can be used to lift the load.
                                                               Wire rope 12 includes one or more strands, each strand
                                                              containing a plurality of wires. Wire rope 12 can have any
                                                              conventional wire rope construction that is suitable for the
                                                              operational service of wire rope 12. For example and as de-
         Figure 1:  Schematic view  of a hoist system utilizing a wire rope   picted in figure 1, standard hoist rope construction includes
         capable of continuous resistance monitoring.         six outer strands 26a, 26b, 26c, 26d, 26e, and 26f helically

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