In situ formation of threads throughout bore of sleeve inserted into substrate hole

摘要

Threads are formed in situ throughout a bore of a sleeve inserted into a corresponding hole a substrate. A sleeve having a bore is inserted into a corresponding hole of a substrate. A mandrel is rotated through the sleeve. The mandrel has a threaded ended; the threaded end rotating throughout the bore of the sleeve forms threads throughout the bore. Prior to inserting the sleeve into the corresponding hole of the substrate, the sleeve can be placed onto the mandrel. In this case, the mandrel has an increasing diameter at the threaded end thereof, such that the sleeve rests on the mandrel towards the threaded end thereof where the bore has a smaller diameter than the mandrel. The mandrel is then rotated out of the sleeve in a direction opposite the direction in which the sleeve has been inserted into the corresponding hole of the substrate.

主权项

1. A method comprising:
placing a sleeve having a bore onto a mandrel having an increasing diameter at a threaded end thereof, such that the sleeve rests on the mandrel towards the threaded end of the mandrel where the bore has a smaller diameter than the mandrel; after placing the sleeve onto the mandrel, inserting the sleeve and the mandrel into a corresponding hole of a substrate in an insertion direction in which the mandrel enters the corresponding hole before the sleeve does; and rotating a mandrel out of the sleeve in a direction opposite the insertion direction while the sleeve remains in place within the corresponding hole, such that the threaded end of the mandrel is rotated throughout the bore of the sleeve and forms threads throughout the bore.