Crane with self-raising mast

Crane with self-raising mast

  • CN 1,332,872 C
  • Filed: 02/08/2003
  • Issued: 08/22/2007
  • Est. Priority Date: 02/04/2002
  • Status: Active Grant
First Claim
Patent Images

1. hoisting crane, it has one and is rotatably installed in a upper unit on the lower device, and a rotor be installed in the suspension rod of this upper unit, described suspension rod by a suspension rod bont and a rotor the mast that is connected on this upper unit support, described hoisting crane also comprises a jack up mast installation, be used for not having position with this suspension rod is connected time control mast when this mast, described jack up mast installation comprises:

  • A) mast promotes yoke, be connected on the upper unit its rotor and have a S. A., when described mast can not be supported by described suspension rod bont, this mast is promoted yoke to be set joint for and supports this mast, and when described mast can be supported by described suspension rod bont, itself and mast were disengaged;

    B) hydraulic pressure mast lift cylinder is connected this upper unit and described mast its rotor and promotes between the yoke, and described hydraulic pressure mast lift cylinder is extensible and indentation, can make this mast promote yoke like this and rotate around described S. A.;

    C) hydraulic efficiency pressure system, the stretching, extension and the indentation of the described hydraulic pressure mast of its may command lift cylinder.

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