Retaining and releasing device and assembly for spacecraft

A retaining and releasing device for spacecraft, configured for the retaining and releasing a releasable body with respect to a support structure, that comprises the retaining and releasing device comprising:

• a release bolt configured to keep the releasable body and the support structure together in a locked position of the retaining and releasing device,
• a locking device for locking the release bolt in the support structure, the locking device comprising a housing and a segmented ring, the housing being movable in a direction of an axis of the release bolt and the segmented ring configured to expand radially, an external surface of the segmented ring and an internal surface of a corresponding part of the housing being mating surfaces inclined with respect to the axis of the release bolt, such that in the locked position of the retaining and releasing device the release bolt is configured to be retained by the segmented ring,
• an extraction system for the release bolt, comprising a spring, an upper support, a lower support and a nut between the upper support and the lower support, the spring being guided by the upper support and the lower support, the release bolt being preloaded by action of the nut in the locked position of the retaining and releasing device,
• wherein:
• the housing of the locking device comprises an end with a passing helical groove on a surface,
• the retaining and releasing device additionally comprises:
• a release system for acting on the locking device, comprising:
• a rod-with a locking pin, the rod having a same orientation as the release bolt, and the locking pin configured to cooperate with the helical groove of the housing,
• a compression spring, and
• an actuator;
• the actuator is configured to lock the rod in a locked position of the retaining and releasing device, and the compression spring is arranged to abut the housing of the locking device and is arranged around the rod with the locking pin cooperating with the helical groove to turn the rod.