Rivet gun with alignment structures

A rivet gun comprising:

• a barrel having a vise assembly mounted therein;
• a handle formed on and protruding downward from the barrel and having
• an internal space defined in the handle;
• and
• a hydraulic tube mounted in the internal space;
• an annular flange formed on and protruding radially from a bottom end of the handle and having a bottom surface and a rotational angle alignment slot defined eccentrically in the bottom surface;
• a pneumatic cylinder mounted under the handle and the annular flange and having
• a body having a cavity defined through the body and a top opening communicating with the cavity;
• and
• a top cover mounted on the top opening of the body and having
• a mounting hole defined centrally through the top cover such that the hydraulic tube extends through the mounting hole;
• and
• a rotational angle alignment element mounted eccentrically on a top of the top cover and detachably engaging the rotational angle alignment slot of the annular flange;
• and
• a piston assembly mounted in the cavity of the pneumatic cylinder and connected to the hydraulic tube;
• wherein the rotational angle alignment slot and the rotational angle alignment element are both at least partially exposed to be visually observed from an appearance of the fully assembled rivet gun.