An expandable spar filler block device

B - Operations – Transporting – 64 – C

Patent

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Details

B64C 27/473 (2006.01) B64C 27/48 (2006.01)

Patent

CA 2184370

An expandable spar filler block (10) device for use in combination with a spar member (108) of an articulated main rotor assembly of a helicopter. A preferred embodiment of the device includes first and second filler members (20, 22) and an expansion mechanism. Each filler member includes a spar engagement surface that is complementary to the inner mold line (IML) surfaces of the spar member and first and second tapered surfaces. The expansion mechanism for the preferred embodiment of the expandable spar filler block device is a pull shim (40) that includes a first segment and a constant tapered segment having tapered surfaces that are complementary to the first tapered surfaces of the filler members. The spar engagement surfaces and the tapered surfaces of the constant tapered segment are coated with a paste adhesive, and the expandable spar filler block device is inserted in the spar cavity of the spar member with the coated spar engagement surfaces adjacent the IML surfaces defining the spar cavity and the coated tapered surfaces of the pull shim adjacent the first tapered surfaces of the filler members. The constant thickness segment of the pull shim is manipulated to exert a motive force that causes the tapered surfaces thereof to slidingly interact with the first tapered surfaces of the filler members such that the spar engagement surfaces are displaced into abutting engagement with the IML surfaces of the spar member.

Bloc dilatable de remplissage (10) se plaçant dans un élément de longeron de rotor principal articulé d'hélicoptère. Dans sa variante préférée, le dispositif comporte un premier et un second élément de remplissage (20, 22), et un mécanisme d'expansion. Chacun des éléments de remplissage présente une surface de contact avec le longeron complémentaire de sa surface intérieure de moulage et une première et une seconde surface biaise. Le mécanisme d'expansion consiste en une cale-clavette (40) comportant un premier segment et un second segment en coin dont les surfaces sont complémentaires des premières surfaces biaise des éléments de remplissage. Les surfaces de contact avec le longeron et les surfaces biaise du segment en coin sont enduites d'une pâte adhésive puis le bloc dilatable de remplissage (10) est inséré dans la cavité du longeron de façon à ce que la surface enduite touche la surface intérieure de moulage du longeron dont elle détermine la forme, les surfaces biaises enduites de la cale-clavette étant contigus aux premières surfaces biaises des éléments de remplissage. Le segment d'épaisseur constante de la cale-clavette est manipulé de façon à exercer une force de déplacement qui amène ses surfaces biaises à glisser sur les premières surfaces biaises des éléments de remplissage et les surfaces de contact avec le longeron à venir buter contre la surface intérieure de moulage de l'élément de longeron.

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