Lathe tool

In a cut-off tool holder having a planar bottom surface portion and adapted for releasably mounting on a lathe turret, including a support member defining a support surface for said cut-off tool an overhead clamping member and means for releasably securing said clamping member to said support means to provide clamping action thereto whereby to project a cut-off tool horizontally outwardly therefrom, the improvement thereby said clamping member comprises a lid having a tool retaining surface juxtaposed with said support surface and spaced vertically from said support surface, said support surface being spaced a predetermined distance from said planar bottom surface portion, and pivoting means for rotating said lid with respect to said support surface, said pivoting means including a hinge pin horizontally disposed intermediate said support member and clamping lid, parallel to the orientation of said cut-off tool, said hinge pin comprising a center section intermediate a pair of adjoining end sections of reduced diameter, portions only of said end sections extending exteriorly of said cut-off tool whereby to permit conversion of translational displacement of said lid, caused by vibration of said cut-off tool, into slight rotational movement about said hinge pin and against the clamping action of said securing means.