Patent ID: 7516857
Filing Date: 2009-04-14
Classification: B66C,Y10S

Abstract:
1. A crane having a movable boom and comprising: at least two running tracks for cable carriers, said at least two running tracks comprising a fixed running track and a movable running track, wherein said at least two running tracks engage into one another with a positive lock, said fixed running track being connected with a supporting structure of the crane or with the movable boom in a fixed manner, said movable running track being displaceable on the supporting structure of the crane or on the movable boom via springs disposed between the movable running track and the supporting structure of the crane or the movable boom, said springs being arranged parallel to a longitudinal axis of the movable running track, so that the movable running track can move in all operating conditions for closing a join gap, wherein pressure force from the springs moves the movable running track toward the fixed running track when the running tracks are folded together, to eliminate any gap between the running tracks.