Importance

Loading Importance Indicators...

Abstract

A drive system for engaging a small diameter abrasive disc with a power tool. The drive system includes an arbor which is adapted to engage the power tool. The arbor includes a shaft portion formed on one end and external threads formed on the other end. The external threads have a first pitch. The drive system also includes an abrasive disc backing plate which has a mount extending outward from the backing plate on one side of the backing plate. The mount has internal threads formed on it for threadingly engaging the threads formed on the arbor. The engagement of the threads in the mount with the threads on the arbor providing a rigid attachment for facilitating rotation of the disc by the power tool when the arbor is engaged with the power tool. The threads on the mount having a second pitch which is different from the first pitch. The difference in pitch locking the backing plate into engagement with the arbor. A stop is located between the shaft portion and the external threads which limits the extent of engagement between the threads in the mount and the threads on the arbor by contact between the mount and the stop. The location of the stop on the arbor is selected to permit complete engagement of the arbor with the disc after the disc is turned between about 1/4 and about 11/2 turns. The stop also configured to align the backing plate perpendicular to the axis of rotation of the arbor.

Loading the Abstract Image...

First Claim