Patent ID: 7623082

Claim:
An actuation mechanism with linear guide implementing a three-dimensional rectilinear guide able to move an antenna reflector with high rectilinear features, providing adequate stiffness and strength during a transportation phase by means of a retention and release system ( 3 ) equipped with a controlled release device ( 6 ), comprising: a) a kinematic system, constituted by the first, second and third TYPEs (TYPE 1 , TYPE 2 and TYPE 3 ) of kinematisms and actuated by an electromechanical linear actuator ( 1 ) placed along a first symmetry axis (z 0 ) of the kinematisms themselves, wherein i) the kinematism of the first TYPE, each is constituted by first, second, third and fourth links (Link 1 , Link 2 , Link 3 and Link 4 ), appear equal in first three planes (π 1 ) belonging to the beam having the first axis (z 0 ) as a common axis and located 120° respective to each other, the third and fourth links are constrained in fixed mutual position and hinged together in a fixed point in the space; ii) the kinematisms of the second TYPE are constituted by three pairs of fifth links (Links 5 ) which lie in second three planes (π 2 ) rotated by 30° with respect to the respective first three planes (π 1 ), said second three planes forming the side faces of a prism with a equilateral triangular base having vertices thereof, the ends of the three fourth links constrained to the fifth links by means of a suitable articulated joint, to allow each of the fourth links to actuate a pair of the fifth links belonging to two different spiders; iii) the kinematism of the third TYPE is a mechanical leverage which transmits the motion to an upper Platform ( 5 ) and a contemporary action of the three sixth links in the respective first three planes (π 1 ) obliging the platform to translate along the first axis (z0); and b) the retention and release system ( 3 ) comprises three identical V-like structures placed at 120 degrees with respect to each other and equipped with the controlled release device ( 6 ) wherein the controlled release is obtained by means of shape-memory alloys and connected to a supporting structure ( 4 ) by means of elastic hinges ( 7 ).