Patent ID: 8689419

Claim:
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.