Patent ID: 7082657

Claim:
An automatic suction and repelling device for a rivet pin in a rivet gun comprising: a) a body mounted on a support frame connected to a handle of the rivet gun and having: i) an inner cylindrical hole; ii) an intake passage; and iii) at least one body hole communicating with the intake passage and the inner cylindrical hole; b) a pull rod assembly located on a first end of the body; c) a regulation ring having: i) an O-shaped ring and a groove located adjacent to the at least one body hole; ii) a center hole; and iii) a nail-repelling pipe; d) a guide sleeve located in the center hole of the regulation ring and having an elongated ring-shaped groove and a first ventilation hole communicating with the elongated ring-shaped groove and the inner cylindrical hole of the body; e) a used-nail cylinder, the regulation ring and the used-nail cylinder are located on a second end of the body, the nail-repelling pipe extending into an interior of the used-nail cylinder; f) a piston-pulling rod inserted into the inner cylindrical hole of the body and having: i) a hollow long pipe; ii) an outer sleeve pipe inserted over the hollow long pipe and having a convergent hole located adjacent to an end of the hollow long pipe, the outer sleeve pipe having a second ventilation hole communicating with the elongated ring-shaped groove; and iii) a space located between the hollow long pipe and the outer sleeve pipe, wherein pressurized air selectively flows through intake passage, the at least one body hole, the inner cylindrical hole, the first ventilation hole, the elongated ring-shaped groove, the second ventilation hole, and the convergent hole creating a vacuum suction force pulling a pull rod of the rivet pin into the used-nail cylinder.