Patent ID: 8365375

Claim:
A rivet gun comprising: a barrel being hollow and having a front end, a rear end and a bottom; a shaft mounted under the bottom of the barrel and having a top end, a bottom end and a central hole defined through the bottom end; a handle mounted around the shaft and having a top end and a bottom end; and a pneumatic cylinder assembly mounted under the bottom end of the handle and having a top cover mounted detachably on the bottom end of the shaft and having an outer edge, a through hole defined through the top cover and mounted around the shaft; a fastener mounted detachably on the bottom end of the shaft and abutting the top cover so that the top cover is mounted and limited between the fastener and the annular shoulder of the handle; an annular cylinder mounted detachably under the top cover and having a top end, a bottom end, a cavity defined through the annular cylinder; and a bottom base mounted detachably on the bottom end of the annular cylinder.