Patent ID: 7226348

Claim:
An air sander grinder structure comprising: an air chamber mounting, having a cylinder placed inside an air sander grinder body and an air chamber formed in the center of the air chamber mounting, and on the side of the air chamber having an air inlet and air outlet; the air chamber mounting being connected to an outer plastic ring on an outside of an inner metal ring; an eccentric mounting being comprised of a mandrel on a top section and an eccentric component on a bottom section, the top of the mandrel having a drive section placed in the air chamber of the air chamber mounting, the bottom of the mandrel having a linkage section connected to the eccentric component on the bottom; the mandrel being comprised of metal, the eccentric component being comprised of plastic; the plastic eccentric component being formed into one piece, the top of the eccentric component being connected to the linkage section of the mandrel, and an inner groove being formed in the bottom of the eccentric component for the pivotal bearing of the grinding disc of the air sander grinder to be placed inside.