Patent ID: 6447227
Filing Date: 2002-09-10
Classification: F16B

Abstract:
A threaded fastener of the type comprising:A a shank, a radially enlarged head at one end of the shank, an external screw thread on at least a part of the shank, and a bore extending through the head and into the threaded part of the shank, at least the threaded part of the shank being radially expandable into threaded engagement with the wall of a suitable unthreaded bore in a workpiece in which that threaded part has been inserted, the fastener thereafter being removable by unscrewing it from the workpiece bore; the expandable part of the shank being provided with a plurality of radially Extending lugs or other protrusions provided on the threaded part of the shank thereby to resist unscrewing of the fastener from the workpiece bore.