Power tool chuck

A power tool chuck comprising:

• a chuck body extending along a chuck axis and couplable to an output spindle of a rotary power tool;
• a longitudinal bore defined in the body along the axis for receiving a tool bit therein;
• a plurality of radial slots defined in the body in communication with the longitudinal bore;
• a plurality of jaw assemblies received in the body, each jaw assembly at least partially received in one of the plurality of radial slots and moveable to engage and removably retain the tool bit in the chuck body;
• a clamping ring received over the chuck body and the jaw assemblies and rotatable relative to the chuck body and the jaw assemblies to engage and removably retain the tool bit in the chuck body,
• wherein each jaw assembly defines a first jaw portion and a second jaw portion moveable relative to the first jaw portion, and one of the first jaw portion and the second jaw portion is configured to cause the jaw assembly to clamp the tool bit at a first clamping force up to a first maximum clamping force during a first phase of clamping, and the other of the first jaw portion and the second jaw portion is configured to cause the jaw assembly to clamp the tool bit at a second clamping force that is greater than the first maximum clamping force during a second phase of clamping.

A power tool chuck comprising:

• a chuck body extending along a chuck axis and couplable to an output spindle of a rotary power tool;
• a longitudinal bore defined in the body along the axis for receiving a tool bit therein;
• a plurality of radial slots defined in the body in communication with the longitudinal bore;
• a plurality of jaw assemblies received in the body, each jaw assembly at least partially received in one of the plurality of radial slots and moveable to engage and removably retain the tool bit in the chuck body;
• a clamping ring received over the chuck body and the jaw assemblies and rotatable relative to the chuck body and the jaw assemblies to engage and removably retain the tool bit in the chuck body, wherein the clamping ring comprises an inner ring threadably connected to the chuck body by a first thread and an outer ring received over and threadably connected to the inner ring by a second thread, the first thread configured to cause the jaw assembly to clamp the tool bit a first clamping force up to a first maximum clamping force when the inner ring rotates relative to the chuck body during a first phase of clamping, and the second thread is configured to cause the jaw assembly to clamp the tool bit at a second clamping force that is greater than the first maximum clamping force when the outer ring rotates relative to the inner ring and the chuck body during a second phase of clamping.