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         in the cable 2 (see e.g., the illustrated cable embodiments in
         figures 5-8). However, choice of materials and types of opti-
         cal fibers are not limited to the above. In fact, optical fibers
         of various characteristics and various configurations, includ-
         ing the wavelength of the light to be emitted, may be used
         appropriately in accordance with the intended purpose and
         environment.
           With reference to figures 5, 6, and 8, the outermost layer of
         cable 2 may be surrounded by a plastic protective coating 11   Figure 10:  Perspective  view  of the  cable control assembly shown
                                                              installed on a vehicle tailgate.
         in order to insulate the reinforcing cable 2 from undesirable
         moisture,  salt, acid or  alkaline substances  and electricity   and a motor coupled to the input shaft to drive the input
         which may cause corrosion. The plastic material of the plas-  shaft and spool in a first direction to take up cable on the
         tic protective coating 11 may be made from any art-recog-  spool and in a second direction to release cable from the
         nized polymeric material. In some embodiments, the plastic   spool. The control system also has two clutches that allow
         is selected from polyolefins, nylon, Teflon and combinations   rotation of the spool without corresponding rotation of the
         and  copolymers  thereof.  Further,  the  polyolefin(s)  may  be   motor. Each clutch may have a first member coupled to
         selected from polyethylene, polypropylene, polybutylene and   the input shaft and a second member coupled to the spool
         copolymers thereof. The plastic material can further include   and relative rotation between the first and second mem-
         carbon black, antioxidants, or other UV absorbing or reflect-  bers of the clutch allows rotation of the spool relative to
         ing material, and combinations thereof, in order to prevent   the motor or input shaft.
         damage to a passivation layer formed on the surfaces of the   Referring in more detail to the drawings, figures 9 - 13
         wire ropes, including oxidization due to sunlight, of CO and/  illustrate a cable control system 10 that may be used with
                                                       2
         or Cl  and secular degradation due to exposure to the outdoor
             -
         atmosphere after installation of the external reinforcing ca-
         ble 2. In another embodiment, as illustrated in figure 7, the
         wire ropes 20 and/or 30 may also be coated with a protective
         layer 32 of the plastic. The same plastics and additives listed
         above in regard to the outer coating on the cable may be used
         for the outer coating of the individual wire ropes that form
         the cable.
           Furthermore with reference to figure 5, gaps 12 between
         the wire ropes 20 and 30 that form the cable 2 can be filled
         in various ways. For example, the gaps 12 can be filled with
         a filling agent, such as epoxy  resin, varnish, rosin wax, a
         gel of petroleum based oil or a combination thereof. The fill-
         ing agent can further include silica for adjusting consistency
         across the cable. In addition, the filling agent may further   Figure 11:  Perspective  view  of the  cable control assembly shown
         include sodium salt for adjusting an acid value. Instead of   without any cable.
         filling the gaps with a filling agent, it is also possible in other
         embodiments to fill the gaps between the one or more wire   a cable 12 to control the take up and pay out of the cable.
         ropes 20 and 30 and the one or more optical fibers 3 by wrap-  The control system 10 may include a drive 14, such as an
         ping or otherwise encasing the wire ropes and the optical   electric motor, to provide a powered take up and/or pay
         fibers in elastic or supple layers of material, for example, a   out of the cable 12 and thereby drive a component coupled
         nonwoven fabric further coated with plastic. The gaps may   to the cable between first and second positions. In the im-
         thus be filled simply by compression during winding of the   plementation shown in figure 10, the cable control system
         ropes to form the cable.                             10 is connected to a vehicle tailgate 16, such as is com-
                                                              monly  provided  in  a  pick-up  truck,  to  facilitate  opening
         Dual clutch cable control system                     and closing the tailgate. The cable control system 10 may
         Pat. 9,587,421 U.S. class E05F 15/627 Int. class B60P 1/267  also be used with all or part of a liftgate commonly found
         Inventor: John W. Harrison, Goodrich, MI, Aubrey J. Nofz-
         inger, Rochester Hills, MI.
         Assignee: DURA OPERATING, LLC., Auburn Hills, MI.
           In at least some implementations, a cable control sys-
         tem includes a spool on which a portion of a cable may be
         taken up and released, an input shaft coupled to the spool,











                                                              Figure 12: Partially sectioned  perspective  view  of the  cable control
         Figure 9: Perspective view of a cable control assembly.  assembly without any cable.

         56     Wire Rope News & Sling Technology   June 2017
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