transmission is increased. The force schematic of the output reducer pair becomes more efficient and the cable connection is simplified. Tn normal operation of the lock system the most loaded branch of the cable is the one closest to the drive. However, all branches are made equally durable, since loads can increase randomly in any lock. The structure of the cable connection should insure effective and convenient regulation of the position of the pulley in each lock and the forces of the preliminary tightening of the cable. Each branch of the cable connection has two regulating screws. In the regulation usually a preliminary tightening in the cable is created which is equal to half the nominal force for tightening . This tightening insures operation without "sagging" of the cable during tightening with a force equal to. To insure work capacity of the cable connection when the nominal force was exceeded, there were grooves in the pulleys of the locks and additional guide rollers. The size of the unit was greatly affected by the connection of the ends of the cable. Practice showed that the most compact scheme is attachment of the cable using bushings, which were subjected to compression until plastic deformations were generated. This ending supports loads up to destructive loads and is of minimal size. Analysis confirmed by experiments showed that in the case of torque on the cable, the locks could open; however, this depended on which of the branches of the cable broke down. The reliability of preservation of the joint is insured if the cable connection in the tightened state of the locks was loaded by a force of preliminary tension , about 15-20% of the destructive force . For example, in the Soyuz APDA a special cable was used with a diameter of 4.5 mm, in which . The locks are installed inside the docking frame so that breakdown of even the minimum number of loaded parts (actually only the clamps themselves) is critical. The mechanisms of back-up separation of the active and passive clamps using pyrotechnic bolts have a minimum number of moving parts, and are completely independent of the cable drive. All contacting surfaces of the clamp or surfaces of the clamp which separate during undocking are coated with solid lubricants.
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