The LASH containership requires two parallel 600-foot runs of a highly reliable traction interface between a 450 ton capacity gantry crane and the ship itself. Ordinary rack and pinion gearing would not provide tooth load uniformity, depth of engagement control, and smoothness of roll considering the essential elastic and out-of-true nature of a ship as a base. The solution was found in a novel rack tooth shape called "cradle", meshing with four self-aligning pinions with elliptically crowned teeth. Full depth engagement is controlled as a master/slave relationship is maintained between datum crane rails and rack mounting by means of a novel alignment installation car. The desirable by-product of the cradle/crown tooth geometry and mimic alignmnet concepts, with their high degree of reliability, is the great economic advantage. Full utilization of material, weight reduction, minimum machining, and new techniques in flame cutting are basic developments that ensure the dependable operation of the huge gantry cranes that are unique to LASH containerships.

  • Supplemental Notes:
    • Presented at Gulf Section of SNAME, May 1971.
  • Corporate Authors:

    Society of Naval Architects and Marine Engineers

    601 Pavonia Avenue
    Jersey City, NJ  United States  07306-2907
  • Authors:
    • Barr, W A
  • Publication Date: 1971-5

Subject/Index Terms

Filing Info

  • Accession Number: 00019640
  • Record Type: Publication
  • Source Agency: Society of Naval Architects and Marine Engineers
  • Files: TRIS
  • Created Date: Nov 25 1973 12:00AM