Pneumatic brass drift set

Abstract

A set of brass punches compatible with a single steel driver that is formed to cooperate with a pneumatic driving tool wherein each punch includes an identical counterbore construction for receipt of a threaded end of the driver.

1 . A pneumatic punch set comprising, in combination: 
 a driver comprised of a hardened steel member in the form of a longitudinal rod member having a longitudinal axis of symmetry with a driving end including a rod section for receipt of a pneumatic driving tool, a flange for engagement by a pneumatic driving tool, a driven end opposite the driving end, said driven end including a frustoconical shaped seat end with an included obtuse angle, an adjacent cylindrical pilot section, and a further threaded section adjacent the pilot section; and    a set of at least two punches, said punches each including a counterbore driver receiving end with a substantially identical counterbore for receipt of the driven end of the driver, said counterbore including a frustoconical seat fully compatible with the driver frustoconical shaped seat end including substantially the same included obtuse angle, a cylindrical pilot section having a diameter substantially equal to the driver pilot section diameter and a longitudinal length greater than or equal to the driver pilot section longitudinal dimension, and a threaded section compatible with the driver threaded section, the crest diameter of the driver threaded section being greater than the diameter of the driver pilot section, said punches each further including a punch end, having a diameter equal to or less than the outside diameter of the receiving end; at least one of the punches of the set including a punch end with a draft angle of the outside surface with respect to the longitudinal axis in the range of about 2° converging toward the punch end, said punches each comprised of a deformable brass material having a hardness less than the hardness of the driver.