Tubular screwing tool for screwing a hollow screw with an external thread into a hole

摘要

The tool has a driving pin (6) including a driving profile (6a), and an expandable threaded drill (7) at an end projecting out from a hollow screw (1). The drill is widely expandable during rotation in a passage hole of a component so that the drill forms a cutting thread (15), which sits on expandable parts. The cutting thread cuts an inner thread in the hole by expanding of components of the drill by rotation of the pin, where the screw is screwed in the inner thread. The spreading unit is interspersed with channels i.e. holes, which guide an air flow.