The clarkson dedlock chuck
The thread that the cutter screws to is able to rotate within the body of the chuck. This thread has a multi start helix and two flats that the screws push against. The right screw tightens the cutter and when the cutter is to be realesed the right screw is loosened and the left tightened to push the helix to break the joint between the mating face of cutter and arbour.
Hope this helps

Dedlock not Deadlock