Unfolding joint for satellite solar generators

#The invention concerns a joint for unfolding systems such as satellite solar generators. Preferred embodiments include joints with two joint halves, a hinge pin and a drive.

#Unfolding systems such as large-area satellite solar generators consist, for example, of individual flexible segments that unfold after being transported into space.

#The unfolding can be brought about by spring or motor-actuated unfolding joints that can be directly connected to the individual segments or connected to rigid extension arms that act on the segments.

#FIG. 1 is a schematic sectional view of an unfolding joint in a folded state and constructed according to a preferred embodiment of the present invention;

#FIG. 2 shows the unfolding joint of FIG. 1 in an unfolded state;

#FIG. 2A is a schematic depiction of an alternative arrangement for the drive of the small pulley, including a drive toothed-belt and motor;

#The unfolding joint in FIG. 1 comprises two joint halves 1, 2, a hinge pin 3, a drive spring 4, a small pulley 5, a large pulley 6 (the diameter of the small pulley 5 is less than that of the large pulley 6), a cord 7 and a stop 8.

#The small pulley 5 is rotatably mounted to a joint half 1 and is connected to the drive spring 4. After the pretensioned drive spring 4 is triggered by telecontrol, it exerts torque on the small pulley. The drive spring 4 is connected to the small pulley 5 so that the torque winds the cord 7 that is attached at one end to the perimeter of the small pulley 5.

#The large pulley 6 is mounted on the hinge pin 3 that connects the two joint halves 1, 2 and is fixed to the second joint half 2. The cord 7 is taut between the two pulleys, and its other end is anchored to the perimeter of the pulley 6 in such a manner that the two pulleys rotate in opposite directions.