US Patent 7721391 Quick release lock mechanisms for handle extensions

Locking mechanisms for releasably connecting handle extensions to tool handles having either compatible lock engaging end portions or standard internally threaded sockets include an adaptor mounted on an outboard end of a handle extension, the adaptor including an extension pole tip with circumferentially spaced thread segments axially insertable into tool handle sockets having compatible lock engaging end portions and threadably connectable to tool handles having standard internally threaded sockets. Means are provided for preventing relative rotation between the adaptor and tool handles having compatible lock engaging end portions when the extension pole tip is fully inserted into the tool handle sockets and for preventing inadvertent pull out of the extension pole tip from the tool handle sockets.