| 摘要 |
A threaded fastener for use with bolt comprises a housing having a central bore that includes a bolt insertion aperture and a plurality of cylindrical and frustoconical steps. A plurality of insert segments are placed within the central bore. Each insert segment includes an inwardly facing threaded portion and a front projection extending outwardly from the threaded portion. The front projection has a beveled edge arranged for sliding contact with a corresponding beveled portion of the housing. The front projection also has outwardly extending portion that cooperates with a ledge in the housing bore to limit longitudinal movement of the insert segment in the housing. A rear projection extends inwardly from the threaded portion and is arranged for sliding contact with a second beveled surface of the housing. An end cap retains the insert segments in the housing. The end cap includes a thin annular plate having an outer edge that fits within housing and a cylindrical portion that projects into the housing from an inner edge of the annular plate. The plurality of insert segments are displaced in the housing to accommodate longitudinal movement of bolt through the housing so that rotation of the housing relative to the bolt secures the threaded portions of the plurality of insert segments to the bolt with beveled surfaces of the housing engaging the front and rear projections of the insert segments to retain the insert segments within the housing as the housing is tightened on the elongate threaded member.
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