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Telescopic crane for heavy loads

  • US 4,660,731 A
  • Filed: 08/03/1984
  • Issued: 04/28/1987
  • Est. Priority Date: 10/05/1981
  • Status: Expired due to Fees
First Claim
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1. A mobile crane having load hoisting means, said mobile crane comprising:

  • a wheeled crane chassis;

    a superstructure rotatably mounted on said crane chassis;

    a telescopic boom having a first end and a second end, said boom being adapted to be pivotably coupled to said superstructure and to be detached from said superstructure;

    longitudinal extending tracks located on said superstructure for engaging said second end of said boom;

    a boom vehicle for supporting and transporting said telescopic boom;

    positioning means located at a forward end of said boom vehicle for receiving and retaining said first end of said telescopic boom in a stationary position relative to said boom vehicle;

    a lifting structure located at a rear end of said boom vehicle for lifting and supporting said boom when mounted on said boom vehicle;

    a coupling yoke located at said second end of said telescopic boom;

    extending and retracting means located on said boom for displacing a part of said telescopic boom towards said crane chassis while said first end of said boom is held stationary on said boom vehicle;

    said coupling yoke including bearing eyes;

    said superstructure including alignment bores so that when said first end of said telescopic boom is held stationary on said boom vehicle by said positioning means and said second end of said telescopic boom is displaced by said extending and retracting means to engage said second end of said boom with said tracks, said bearing eyses are longitudinally aligned with said alignment bores; and

    means for connecting said telescopic boom to said superstructure when said bearing eyes and said bearing bores are aligned.

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