Control systems for moving bodies

A moving body comprising:

• a rotatable portion arranged for rotation about a predetermined axis relative to another portion of the body,
• first and second control members on said rotatable portion for separate actuation by first and second actuator mechanisms movable in response to the energisation of first and second electromagnetic coils forming part of the mechanisms and contained in the said other portion of the body, said coils being mounted in spaced relation in the said other portion along the rotary axis of the said rotatable portion and concentric with respect thereto, with the first coil nearer to the rotatable portion than the second coil,
• the first actuator mechanism comprising an axially movable sleeve co-axial with the rotary axis and extending at one end into the rotatable portion and at the other end carrying an armature disc mounted concentrically with respect to the sleeve and in cooperating relation with the first coil which upon energisation causes the disc and the sleeve to move axially to effect actuation of the first control member, and
• the second actuator mechanism comprising an axially movable shaft coaxial with the rotary axis and slidable within the sleeve, said shaft extending beyond said sleeve at each end, one end of the shaft extending into the rotatable portion of the body and the other end carrying a further armature disc concentric with the shaft and arranged in cooperating relation with the second coil which upon energisation causes the further disc and the shaft to move axially to effect the second control member.