Patent ID: 7503733
Filing Date: 2009-03-17
Classification: B23B,B25F,Y10T

Abstract:
1. An adjustment assembly for a drill having a body, a drill motor mounted in the body, a drill axis, and a chuck extending from the body along the drill axis for releasably supporting a drill bit, the adjustment assembly comprising: a cap adapted to be mounted to the body adjacent the chuck and having an external thread; a coupling having an internal thread for engaging the external thread on the cap and supporting the coupling on the drill in a variable axial position; a lock nut having an internal thread for engaging the external thread on the cap and supporting the lock nut on the drill in a variable axial position, the lock nut releasably abutting the coupling to lock the coupling from axial movement relative to the drill; wherein the external thread on the cap is completely covered by the coupling and the lock nut regardless of an axial position thereof, such that the external thread is contacted only by the coupling and the lock nut and is not exposed to incidental contact; and the coupling further comprises: a retainer for supporting a pressure foot and drill bit bushing for enhancing axial alignment of the drill bit, the pressure foot comprising a holder having a spring for limiting a feed rate and controlling a depth of the drill bit, and the drill bit bushing comprises an adapter mounted to and axially movable relative to the holder, and a sleeve extending from the adapter for circumscribing the drill bit.