Abstract: A tool arrangement and chuck apparatus for quick change of a range of tools; particularly, a quick change chuck adapted to engage various diameter drill bits, tools and tool holders. The tools are rotatable in a chuck or adaptor and have at one end a centering shaft portion having a constant diameter for multiple tool end diameters and shapes, a drive shoulder portion and a lock portion. The chucks have a tool centering arrangement for accommodating the constant diameter centering shaft. The chucks are also described as having tool bit release mechanism operable to disengage the tool from a retention mechanism when a force is applied inwards of the body of the chuck by the user to allow the tool bit to be removed longitudinally from the chuck but also arrange to allow the tool bit to be inserted longitudinally into the chuck without requiring any other user operation.

Abstract: The present invention relates to a dual lock apparatus (10) of the type including a locking bolt (14) moveable between a first locked position and a second unlocked position said bolt movement corresponding with longitudinal movement of a slider (26) said apparatus including a first and a second locking means adapted to operate independently of one another. The first locking means (74) includes a rotatable cam (76) such that when rotated said cam acts against a moveable piston to thereby move said piston from a first position to a second position in which the second locking means becomes disengaged from said slider and further rotation of the cam urges longitudinal movement of the slider.

Abstract: The present invention relates to a dual lock apparatus (10) of the type including a locking bolt (14) moveable between a first locked position and a second unlocked position said bolt movement corresponding with longitudinal movement of a slider (26) said apparatus including a first and a second locking means adapted to operate independently of one another. The first locking means (74) includes a rotatable cam (76) such that when rotated said cam acts against a moveable piston to thereby move said piston from a first position to a second position in which the second locking means becomes disengaged from said slider and further rotation of the cam urges longitudinal movement of the slider.

Abstract: A deadlocking assembly for use in locks that includes a rack supporting a bolt and a driving or pinion gear that drives the rack. Both the rack and the pinion gear have teeth that intermesh. The pinion gear further includes two arms, one of which acts as a stop when extending the bolt and the other that acts as a deadlock. When in the deadlocked position, forcing of the bolt is prevented by the other arm since the pinion gear teeth and the rack gear teeth at that position do not intermesh. A tab is further used to limit further rotation of the pinion gear.