Abstract: A power system is provided for extending and retracting a telescopic seating structure. The power system includes a frame, a drum operably mounted on the frame for rotational movement, and a plurality of slidably interconnected telescoping members having a terminal telescoping member operably attached to the telescopic seating structure. A cable is wound about the drum and the plurality of telescoping members. Upon rotation of the drum in a selected direction, a tensional force is exerted upon the telescoping members causing their selective extension or retraction to thereby extend or retract the telescoping seating structure. A control assembly is operably connected to the drum shaft to thereby deactivate the power mechanism when the telescopic seating structure is filly extracted or retracted. A cable guide assembly is positioned below the drum to thereby ensure that the cable is properly wound upon the drum during rotation to thereby assure maximum efficiency of the power system.

Abstract: A power system is provided for extending and retracting telescopic seating. The power system includes a frame, a drum operably mounted on the frame for rotational and translational movement, and an extendable chain having a first end operably attached to the telescopic seating and a second end operably attached to the drum. A power mechanism is configured to rotate the drum to wrap the extendable chain onto the drum and further is configured to raise the drum as the extendable chain is wound onto the .drum and takes up space thereon. Still further, the power mechanism is configured to lower the drum as the extendable chain is unwound from the drum and takes up less space thereon. The extendable chain includes interconnected links with wheels that mateably nest adjacent each other in alternating positions as the chain is wound onto the drum.