Patent ID: 7506877
Filing Date: 2009-03-24
Classification: B23B,Y10T

Abstract:
1. A bit extension for releasably clamping a bit or tool in an extended fashion from a rotational power source comprising: a. a body comprising a shank adapted for removable connection to a rotational power source and an opposite end having a blind bore with a radius of curvature extending inwardly of the opposite end; b. a generally tangential clamping bore intersecting with the blind bore through a sidewall of the opposite end of the body, the clamping bore including a clamping sleeve section from one side of the body inwardly to an inner section of reduced diameter and a third section opposite the clamping sleeve section from the inner section terminating with an opening on another side of the body; c. a clamping sleeve slideably insertable into the clamping sleeve section of the clamping bore; the clamping sleeve including an internal threaded through-bore and an eccentric periphery relative to a centerline of the through-bore including a clamping surface that is adapted to follow the general radius of curvature of the blind bore but enter the blind bore at the intersection of the blind bore and the clamping bore; d. a threaded fastener insertable through the third section of the clamping bore into mating threadable engagement with the threaded through-bore of the clamping sleeve, the threaded fastener being rotatable by a single tool through a tool interface; e. so that the clamping sleeve can be drawn towards the intersection of the clamping bore with the blind bore to provide clamping action to a bit in the blind bore.