Patent ID: 6796161
Filing Date: 2004-09-28
Classification: B21D,H01R

Abstract:
A fastening device of a punch assembly for a pneumatic metal-work tool comprising:a body of said pneumatic metal-work tool having an externally threaded rod on a front end thereof and a punch shaft located in a center of the threaded rod, an inner cylindrical surface and an outer cylindrical surface of said threaded rod are furnished with threads respectively; an actuation assembly having an outer cylindrical surface furnished with threads and an inner cylindrical surface thereof furnished with a punch shaft; a stop screw; a threaded ring which is a ring-shaped member with a rectangular section, and an inner surface thereof is furnished with threads, an outer surface thereof being a smooth surface; threads of said inner surface to be engaged with threads on the outer cylindrical surface of the actuation assembly; said threaded ring furnished with a through screw hole for receiving the stop screw; a fastening ring mounted around said threaded ring, and having a first curved surface furnished with threads, a cylindrical surface and a second curved surface on an interior thereof, the second curved surface having a diameter that is smaller than a diameter of the cylindrical surface; a shoulder portion formed between said second curved surface and said cylindrical surface, and said shoulder portion being in close contact with an outer surface of said threaded ring; and at least one rectangular through hole.