Slide-on rotary tools

Claim 1

A rotary tool having a distal end adapted to perform a work function and a proximal end adapted to receive rotation from the shank portion of another rotary tool bit by adapting means comprising: (a) at least two elongated members axially aligned and radially spaced on said rotary tool, said elongated members having substantially smooth outside surfaces and inside surfaces with respect to said rotary tool, said inside surfaces adapted to receive rotational forces from said shank portion, (b) compressing means disposed about said elongated members, and adapted for generating concentric pressure between said elongated members and said shank portion, said compression means comprising a slideable member with a tapering cavity having at a first selected portion of said elongated members a greater clearance than at a second selected portion of said elongated members and (c) friction reducing members disposed within said cavity between said slideable member and said outer surfaces, said friction reducing members for easing the sliding movement of said slideable member and for transferring concentric pressure from said slideable member to said shank portion via said elongated members, so that when said slideable member is moved from said first selected portion toward said second selected portion said concentric pressure is gradually increased.