Page 64 - Wire Rope News & Sling Technology - June 2019
P. 64

         continued from previous page                         the rope is steel wire rope. In this way it is well suited to a
         at least essentially on non-metallic fibers in the longitudinal   function requiring grip, in which the rotating traction means
         direction of the rope.                               5 (preferably a traction sheave) of the hoisting machine M
           The aforementioned non-metallic fibers can be synthetic   exerts a longitudinal pull on its surface, the magnitude of
         fibers, ropes manufactured from which being also commer-  which force depends in the grip of the traction means and of
         cially available. Most preferably the aforementioned non-  the rope of the traction roping. A metal rope withstands well
         metallic fibers are polymer fibers or aramid fibers. Preferred   the stresses of the rope clamp c and is reliable. The metal
         polymers are inter alia polyethylene and nylon, ropes manu-  rope is preferably essentially round in its cross-section. The
         factured from which  are commercially  available, e.g.  from   metal rope can be a braided metal rope, e.g. of the type in
         marine rope suppliers. Alongside being light, these types of   figure 7, in which case each of the strands 41 of the rope of
         ropes are cheap and they are cheap to replace on finalizing   the figure, which strands are load-bearing parts, is formed
         the installation with the final elevator ropes. They also struc-  from a plurality of metal wires.
         turally withstand the tightening of the rope clamp c well.   The ropes of the suspension roping and of the traction
         Since grip (e.g. friction) does not need to be transmitted via   roping can, however, be of  a different type than what is
         them for controlling the movement of the elevator car and   presented above. For example, one or more rope of the trac-
         of the counterweight, there are no special criteria for their   tion roping 6 can be a belt, such as a flat belt, or a Poly-
         surface structure. In this case the structure of the rope is   V  belt  suited  to  the  grooving  of  the  traction  means,  or  a
         preferably such that it comprises a power transmission part   toothed belt suited to the toothing of the traction means,
         or a plurality of power transmission parts, for transmitting   with which specifically the grip can be made to be very good
         force in the longitudinal direction of the rope, which power   by the aid of a large contact surface/toothing. In this case
         transmission part is essentially fully of non-metallic mate-  the longitudinal power transmission capability of the rope
         rial. The aforementioned power transmission part comprises   can be based e.g. on metal wires, preferably the rope is a
         non-metallic fibers in strand form, and the rope is prefer-  belt comprising a number of steel wire braids, preferably
         ably a braided rope in its structure. The rope can be e.g. of   parallel ones, inside an elastomer surface. The ropes of the
         the type presented in figure 7 in its cross-sectional shape, in   suspension roping 6 preferably do not comprise toothing, so
         which case the strands 41 of the rope of the figure are formed   that the structure of the suspension ropes would be simple
         from a plurality of non-metallic fibers or fiber bundles.  and light. The ropes of the suspension roping 6 are prefera-
           The traction roping 6 is preferably such that it comprises   bly essentially round in their cross-section. Belt-type ropes
         one or more ropes, the longitudinal power transmission ca-  per se are known in the art. The belt can be e.g. of the type
         pability of which ropes is based at least essentially on metal   presented in figure 8, in which case the belt-type rope com-
         wires  in  the longitudinal  direction  of the rope,  preferably   prises a parallel plurality of metal wire braids 31, which

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