Patent ID: 6557713
Filing Date: 2003-05-06
Classification: B66C

Abstract:
Rotary crane, comprisinga pylon structured and arranged to be anchored on a floor plate, platform, or base, a turntable housed to revolve on a longitudinal axis of the pylon by an upper support and a lower support, a crane boom supported by the turntable, and a gear for rotating the turntable on the pylon, the upper support of the rotary stage having a mount which is positioned on an upper end section of the pylon and which is structured and arranged to rotate, and said mount having an axial support surface for axial support on the pylon, a radial support surface for radial support on the pylon, and suspension equipment for suspending the turntable, wherein an inclined plane is provided on the pylon and a lifting component is structured and arranged to be attached to the mount, said lifting component running along the inclined plane when said support is rotated on the longitudinal axis of the pylon, thereby lifting the mount with its axial support surface from the pylon.