Importance

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Abstract

A thread forming tool comprising a metal cylinder having a thread tap mounted in an open-sided chamber in the cylinder so that the longitudinal axis of one set of teeth on the tap is parallel with the longitudinal center axis of the cylinder and positioned so the teeth project radially outward from the cylindrical surface of the cylinder. A lock structure secures the tap against rotation relative to the cylinder, and driving structure on the cylinder is operable to rotate it around its longitudinal center axis as the tap teeth form threads on a bore through which the cylinder is driven. Different size threads can be cut with a given tap by sequentially positioning the tap at different angles of rotation relative to a center line through the centers of the tap and the cylinder.

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First Claim