Patent ID: 7886920
Filing Date: 2011-02-15
Classification: A63J

Abstract:
1. A theatrical transportation apparatus for use in carrying a theatrical load comprising a supported guide rail, a head block located at or towards one end of the guide rail and a tail block located at or towards the other end of the rail, a first carriage movably mounted on the guide rail and a second carriage movably mounted on the guide rail, the first carriage being adapted to carry a movable lift line for carrying the load, and a compensator system linking the first and second carriage via a first compensator line which makes a greater number of passes from the second carriage to the head block than it makes from the tail block to the first carriage and being arranged such that on movement of the first carriage or the second carriage, the other carriage moves in the same direction and the second carriage moves a shorter distance than the first carriage.