| 摘要 |
An annular closure ring for securing a cover in sealed relation over the open upper end of a cylindrical storage drum or similar container is disclosed in which a split ring is closed about the periphery of the drum and its cover by tightening a headed tie bolt between a pair of laterally spaced lugs fixed to the split ring on opposite sides of the split therein; one of the lugs having a threaded opening therethrough for engagement with the threaded body of a headed tie bolt and the other lug having an enlarged opening therethrough for free passage of the bolt body. The non-threaded lug has parallel lateral faces formed with outwardly projecting teeth bordering the opening therethrough for locking engagement with the underside of the tie bolt head and an opposing jam nut which engages such lug opposite the bolt head; the jam nut being threadingly mounted on the tie bolt between the two lugs and having an axially protruding annular conical guide surface for frictionally engaging an opposing conical chamfer formed about an opposing end of the opening in the non-threaded lug whereby to locate and hold the bolt coaxially within the enlarged opening of the non-threaded lug with adjacent end faces of said nut lockingly engaging the projecting teeth of the non-threaded lug.
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