Multi-step control rivet gun

A rivet gun comprising:

• a barrel;
• a handle mounted perpendicularly on a bottom of the barrel and having a top end, a bottom end, a central hole defined through the handle, an inlet channel defined in the handle and communicating with the central hole, an outlet channel defined through the handle, a valve-driving channel defined through the handle, and a space defined in the handle and communicating with the inlet channel and the valve-driving channel;
• a pneumatic cylinder mounted on the bottom end of the handle and communicating with the valve-driving channel;
• a trigger member mounted pivotally on the handle;
• and
• a two-step pressing assembly mounted securely in the space of the handle to form a rivet gun handle assembly, selectively activated by the trigger member, selectively communicating with the inlet channel and communicating permanently with the valve-driving channel;
• the rivet gun characterized in that:
• the barrel is hollow and has
• a through hole defined axially through the barrel;
• an outlet hole defined transversely through the barrel and communicating with the through hole and the outlet channel of the handle;
• a pressurizing hole defined transversely through the barrel, located behind the outlet hole and communicating with the through hole;
• a hydraulic passageway defined through the bottom of the barrel and communicating with the through hole;
• a vise assembly mounted in the through hole and having a front end and a rear end;
• and
• a condensable chamber defined in the barrel and located behind the rear end of the vise assembly;
• the handle further has
• a valve-mounting hole defined in the bottom end of the handle and located centrically and communicating with the central hole;
• a first mounting hole defined in the bottom end of the handle along a radial direction relative to the central hole;
• and
• a second mounting hole defined in the bottom end of the handle along the radial direction relative to the central hole;
• a pressurizing channel defined in the handle adjacent to the top end, communicating with the central hole, the condensable chamber and the space and selectively communicating with the two-step pressing assembly;
• and
• the pneumatic cylinder has
• a top;
• a bottom;
• an inlet bushing being hollow and cylindrical, mounted in the first mounting hole and having an inlet passageway defined through the inlet bushing;
• an inner bushing being hollow and cylindrical, mounted in the second mounting hole and having an open end and a lower passageway defined in the inner bushing and communicating with the open end;
• a control valve assembly mounted in the valve-mounting hole;
• a chamber defined in the pneumatic cylinder, communicating with the lower passageway and having an inner surface;
• and
• a hydraulic tube being hollow, mounted in the central hole and communicating with the hydraulic passageway.