Patent ID: 6932357
Filing Date: 2005-08-23
Classification: B23B,Y10T

Abstract:
1. A collet nut assembly adapted for holding a tool bit, the collet nut assembly adapted to be mounted to a shaft of a rotary power tool that rotates on a central axis, the collet nut assembly comprising: a base member adapted to be mounted to the shaft; a plurality of planet gears rotatably mounted to the base member, each of the planet gears radially spaced from the central axis; a sun gear positioned on the axis in a central driving engagement relative to the plurality of planet gears, wherein rotation of the sun gear rotatably drives the planet gears; a ring gear extending around the planet gears so that each of the planet gears is drivably engaged with an interior side of the ring gear; a grip sleeve rotatably mounted to the ring gear for rotation about the central axis, the sun gear fixed axially within the grip sleeve; and a clamping structure having a tool bore shaped to receive a tool bit, the clamping structure being actuatable by motion of the ring gear to selectively clamp or release the tool bit from the axial tool bore; wherein the ring gear is threadably engaged with the base member so that rotation of the ring gear about the axis relative to the base member results in axial displacement of the ring gear relative to the base member.