Patent ID: 8651987
Filing Date: 2014-02-18
Classification: F24S,H01Q,Y02E

Abstract:
1. A system for orientation of a ring configured for rotation, the system comprising: a cable coupled to engage the ring which is configured to rotate about a ring axis, a pulley assembly having a plurality of pulleys where each one pulley out of the plurality of pulleys is configured to rotate about a pulley axis which is parallel to the ring axis, the pulley assembly including an at least one proximal pulley disposed closer to the ring than an at least one distal pulley, where each pulley has a plurality of grooves configured for receiving the cable therein, a motor assembly including a motor coupled to a gearbox which is rotated by the motor to provide a first rotation reduction, a driving means disposed adjacent to the ring in pivotal coupling about a hinge, and configured to support the pulley assembly, the motor assembly, and a stretcher, the cable being engaged with the ring and with the at least one proximal and distal pulleys by being wound from a first groove in the proximal pulley to a first groove in the distal pulley and in repeated succession, to a next groove in the proximal pulley to a next groove in the distal pulley, until a last groove in the distal pulley, from where winding returns to the ring, the stretcher being fixedly coupled to the driving means for pivoting the driving means distally away from the ring to stretch the cable and to bias the ring and the pulley assembly in preload, and the ring being rotated by the motor assembly which is coupled to rotate the at least one distal pulley and provides a first reduction of rotation to the pulley assembly which is configured and sized to provide a second reduction of rotation to the ring relative to motor rotation, whereby the ring is driven via at least a double reduction of rotation relative to rotation of the motor, and the cable engages the ring and the plurality of pulleys by friction.