Patent ID: 7681620
Filing Date: 2010-03-23
Classification: E06B

Abstract:
1. A stacking mechanism comprising: a rotatable screw with external thread of length L and pitch P at least one traveling nut mounted on said screw, said traveling nut having internal thread of pitch P an arrester adapted to engage said traveling nut so as to prevent rotation thereof within an axial length L a threaded member with internal thread of pitch P at least one component to be stacked, each component corresponding to one of said nuts and being attached thereto; so that, by means of continuous rotation of said screw in one direction, said traveling nut can slide along said screw within said length L 1 at rate P 1 per 1 turn of the screw under the action of said arrester and said thread with pitch P 1 , can transit smoothly and reversibly from L 1 to L 2 , and can slide with rotation along said screw within said length L 2 at a rate P 2 per 1 turn of the traveling nut under the action of said thread with pitch P 1 and said thread with pitch P 2 .