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           Figure  15 shows  a wire  rope  10  with  a number  of  wire   eter of a wire strand 15.
         strands 15 produced from twisted wires 16 which are twist-  The distances a between the inserts 12 and the plastic core
         ed around a plastic core 11 and elongate inserts 12 are ar-  11 respectively have dimensions such that they respectively
         ranged between  said strands.  The  cross  sections  of these   correspond at least approximately to an extension which oc-
         inserts 12 extending over the whole length of the rope are   curs due to the outwardly directed flow of the plastic core
         shaped such that they extend almost to the outer circum-  11 in the radial direction after a certain initial operating
         ference of the wire rope 10. They are provided here on the   time of the wire rope. This extension moves over a range of
         outer circumference  with a radius  R corresponding to ap-  millimeters depending on the diameter of the core and the
         proximately half the diameter of the rope so as to form an al-  loading of the wire rope.
         most equal outside diameter together with the wire strands   The inserts 12 with their inside end part 12’ respectively
         15. In the region in contact with the wire strands 15 they   projecting through two wire strands 15 respectively have a
         respectively have on both sides a radius corresponding to the   thickness  which is  greater than  the thickness  in  the nar-
         wire strands 15.                                     rowest region of the respective insert 12, these inside end
           These wire ropes 10 are used in particular as pulling or   parts 12’ ending outside of a notional circle 14 on the insides
         hoisting cables with high loading requirements, for example   of the wire strands 15, as shown by dots and dashes. This
         in cable cars which are guided suspended on a stationary   inside end part 12’ of the inserts 12 is respectively rounded,
         supporting cable and are connected to a pulling cable. Pull-  but could also be elliptical, or in the shape of a half polygon
         ing  or  hoisting  cables  are  generally  guided around  rollers   or even flat.
         at the upper and lower  stations and are made as endless
         ropes by means of so-called splicing of their ends or are held   Winch for pipelayer and pipelayer equipped with same
         together by an end attachment (not detailed).        Pat. 9,617,126 U.S. class B66C 23/44 Int. class B66C 23/44
           The twisted wire strands 15 lie directly over the plastic   Inventor: Takuya Uemura, Hirakata, JP, Hiroki Yamamoto,
         core 11 over a specific peripheral region in the grooves 20,   Nishinomiya, JP, Kazumasa Teramoto, Hirakata, JP.
         the inserts  12, however,  respectively being arranged on   Assignee: KOMATSU LTD., Tokyo, JP.
         the inside a distance a away from an outer circumferential   A restraining roller of a hook winch has a roller middle
         surface 11” of the plastic core 11. When using a total of six   part and first and second roller end parts. The roller middle
         wire strands, this groove 20 with a respective wire strand   part is formed in a columnar shape. Each of the first and
         15, with which it lies directly over the plastic core 11, corre-  second roller end parts is formed in a roughly circular trun-
         sponds to an angular range of a respective wire strand in re-  cated cone shape. The widths of the first and second roller
         lation to its cross section of preferably between 40°and 60°.   end parts are greater than the diameter of a wire rope. A
         These helical grooves 20 have a round cross section with a   difference in diameter between an inner end and outer end
         radius which corresponds approximately to half the diam-
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