ADVANCES IN CABLE TRACTION SYSTEMS

A fairly detailed description is given of two different systems incorporating developments in the design and application of winches and their wire-rope arrangements. The first is the GEC Mechanical Handling Ltd MK. II system for transferring solid and liquid stores between a supply ship and another vessel while under way, even in heavy seas. The supply ship has one or more installations, each with a portal frame mounted across the deck; two roping systems, one for solid and the other for liquid transfers, are arranged on each leg of the portal. Individual sets of winch drums are combined in a compact unit for each side of the ship; the special winches not only traverse the load between the two ships but also maintain the rope tension and compensate for any relative motion between the vessels. The article includes a sketch showing the general arrangement of the complete installation, and diagrams of the rope and pulley layout and the electro-hydraulic winch-drive. The other system described is based on Wharton Engineers (Elstree) Ltd's patented quadruple winch, the "Quad", which updates the twincapstan winch introduced by this company about ten years ago. The new winch has, on each of its two axes, a large single-groove capstan and a small multi-grooved drum; capstan and drum are geared to each other by an enclosed epicyclic train. This arrangement, together with the wirerope route, is shown diagrammatically and its principles are explained. The system is suitable for locations where space is limited (e.g., in offshore engineering), and the equipment can be designed into a new installation or fitted into an existing one. A brief description is included of a 17 1/2-ton Quad installation used for taking sea-bed samples; each gearbox is powered by a high-torque low-speed hydraulic motor (max. rating 130 hp at 300 rpm and 2,3000 lb/sq in), and the storage drum carries about 3,000 ft of 1.2-inch diam. wire; back tension is about 700 to 800 lb. Order from BSRA as No. 49,529.

  • Availability:
  • Corporate Authors:

    Morgan-Grampian Limited

    30 Calderwood Street
    London SE18 6QH,   England 
  • Authors:
    • Morse, W
  • Publication Date: 1978-7

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Filing Info

  • Accession Number: 00188812
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Mar 14 1979 12:00AM