Assembly to control or govern relative speed of movement between parts

An assembly comprising:

• a tube with an inner and outer wall and a void therein;
• a cylinder, the cylinder movable relative to the tube in an axial translation into and out of the tube void and rotationally relative to tube;
• and
• a shaft that the cylinder rotates around;
• wherein the tube, cylinder and shaft share a common central axis of rotation;
• wherein the tube and cylinder comprise one or more conductive members and one or more magnetic members, configured so that, when the tube and cylinder have different relative speeds of rotation, eddy current drag forces are produced between the conductive members and the magnetic members resisting relative rotation between the tube and cylinder when the tube and the cylinder overlap;
• wherein the tube, cylinder, or both the tube and cylinder, comprises at least one weight off-set from the common central axis of rotation, that, on rotation of the tube, cylinder, or both the tube and cylinder, is subject to a centrifugal force, the centrifugal force on the at least one weight causing axial movement of the cylinder as a reaction to a rotational torque imposed on the shaft;
• and
• when the magnets and conductors of the cylinder and tube interact together due to an overlap and different relative speeds of rotation to each other, an eddy current braking force is induced against different relative speed of motion of the tube and cylinder with a modulation of the braking force arising due to a balance of the forces on the tube and cylinder caused by both rotational movement and axial movement of the tube and cylinder along a longitudinal axis to an equilibrium position of the tube and cylinder axially and rotationally to provide a controlled eddy current induced braking torque, wherein the tube rotates at a different relative speed of rotation to the cylinder and, as a result of axial translation of the cylinder, overlap between the tube and cylinder, and different relative speed of rotation, eddy current forces are generated between the tube and cylinder creating a drag force on rotation of the tube and cylinder thereby causing the relative speed of rotation of the tube and cylinder to reduce.