Inventors:
Arthur M. James - Beaverton OR
Charles J. Conlee - Portland OR
International Classification:
E04H 1234
Abstract:
A tower crane and method of climbing the crane. The tower of the crane is initially stabilized at an elevated location, and the tower is released from a base frame supporting its base and elevated to place its base on an upper frame, the base frame is then elevated, and the tower is then dropped to place it on the newly positioned base frame with the upper frame then used to laterally stabilize the tower with the crane in operative condition.