Abstract: A mechanism for deploying and retracting an isogrid structure particularly suited for use in supporting low weight reflective or absorbtive surfaces, characterized by a plurality of hinged isogrid panels stowed in an accordian folded stack arranged for automatic deployment into a long continuous strip or array. Two deployment arms in contact with the stack of panels are rotated to a position perpendicular to the stack, carrying with them the first panels. Thereafter the panels are extended by powered sprockets which engage the panel edges. A shutter bar sequentially releases pairs of panels during deployment. For retraction, the sprockets drive the panels back toward the stack where a creaser bar hinges pairs of panels which are thereafter folded into a stack by means of the shutter bar capturing and stowing each folded pair of panels.

Abstract: In a door which is openable by being folded into two or more sections, a device which makes it possible to extend the folds automatically and noiselessly to close the door in such a manner that a series of extended folds look like one closed door when a finger tip pressure on the door for opening it has been released. In so doing, no additional automatic closing device such as a door check or a floor hinge is required.