Patent ID: 8607399

Claim:
An attachment system for a power tool, comprising: an abrasive pad assembly having a mounting plate, a key, and at least one abrasive pad affixed to a side of the mounting plate, the mounting plate having a central aperture and a circular ring disposed therein, wherein the at least one abrasive pad comprises at least one abrasive outer surface configured to come into contact with an external object, and the key is connected to the circular ring, extends diametrically at least partially across the aperture, comprises a magnetically attractive material, and is located entirely below the at least one abrasive outer surface, thereby preventing the key from coming into contact with the external object; and a connector, which is separate and distinct from the abrasive pad assembly, having a main body adapted to fixedly engage a spindle of the power tool, the connector further having a head end extending from the main body and having a circular cross-section sized to engage the circular ring, the head end further having a slot sized to engage the key, the slot further comprising a distal portion extending axially along the head end, a proximal portion extending axially along the head end offset from the distal portion, and a transition portion joining the distal and proximal portions, the main body further comprising a permanent magnet disposed therein having at least one surface adjacent to the proximal portion of the slot and the main body of the connector having a circular cross-section that is larger in diameter than the circular cross-section of the head end of the connector, and includes a shoulder at the intersection of the main body of the connector and the head end of the connector; wherein, the abrasive pad assembly, including the mounting plate, the key and the at least one abrasive pad, is selectively affixed to the connector by manipulating the head end into the circular ring and moving the key through the slot until reaching the proximal portion such that the circular ring comes into contact with the shoulder of the main body, whereupon the key is retained by the magnetic attraction of the permanent magnet and the shoulder supports the abrasive pad assembly via the circular ring.