Rotary tool including a collet

A collet for connecting a rotary tool to a rotary tool driver, the rotary tool including a shaft having a shaft end and a shaft diameter, the collet comprising:

• a body including a first end arranged to connect to the rotary tool driver, a second end having an internal space at least partially defined by a frustoconical bore, and an axis extending between the first end and the second end;
• a plurality of jaw bodies each having a frustoconical outermost surface arranged to engage the frustoconical bore, each jaw body movable along the axis between a retracted position and an extended position, and wherein the frustoconical surface and the frustoconical bore cooperate to move each jaw body radially toward the axis as the jaw body moves from the retracted position to the extended position;
• a plurality of rollers each rotatably coupled to one of the jaw bodies and movable with respect to the respective jaw body between an unlocked position and a locked position;
• a biasing member disposed within the space and operable to bias each of the plurality of jaw bodies toward the extended position, wherein rotation of the rotary tool about the axis in a first direction biases each roller toward the unlocked position to allow movement of the rotary tool with respect to the respective jaw body, and rotation of the rotary tool about the axis in a second direction opposite the first direction biases each roller toward the locked position wherein the rotary tool is substantially fixed with respect each of the jaw bodies.

A collet for connecting a rotary tool to a rotary tool driver, the rotary tool including a shaft having a shaft end and a shaft diameter, the collet comprising:

• a cylindrical surface defining a cylindrical space that surrounds an axis;
• a frustoconical surface extending from the cylindrical surface and defining a frustoconical space;
• a plurality of jaws positioned substantially within the frustoconical space, each of the jaws movable along the axis between a retracted position and an extended position;
• a plurality of roller receiving spaces each defined by the cooperation of a locking surface and an unlocking surface formed as part of one of the jaws;
• a plurality of rollers, each positioned within one of the roller receiving spaces and movable between an unlocked position in which the roller engages the unlocking surface and a locked position in which the roller engages the locking surface;
• and
• a biasing member disposed within the cylindrical space and operable to bias each of the plurality of jaws toward the extended position, wherein rotation of the rotary tool about the axis in a first direction biases the roller toward the unlocked position to allow movement of the rotary tool with respect to the respective jaw, and rotation of the rotary tool about the axis in a second direction opposite the first direction biases the roller toward the locked position wherein the rotary tool is substantially fixed with respect to each of the jaws.