Patent ID: 8215503

Claim:
A telescoping boom crane comprising: a base boom configured to articulate at a first end; a plurality of boom sections arranged in the base boom, each of the plural boom sections configured to individually move telescopically in and out; a plurality of locking pins configured to secure each of plural boom sections in a moved in position or a moved out position; a hydraulic piston-cylinder unit configured to move each of the plural boom section after disengaging at least one of the plural locking pins, the hydraulic piston-cylinder unit comprising: a displaceable cylinder housing; and a piston rod coupled by a first end to an inner end of the base boom and arranged in the displaceable cylinder housing; a safety locking unit coupled to recesses in the plural boom sections and to an inner end and outer end of the displaceable cylinder housing configured to engage and disengage the plural locking pins from the plural boom sections; a first guide frame coupled to the safety locking unit; an additional guide frame whose length is based at least in part on an overall length of the plural boom sections, the additional guide frame having a first additional guide frame end and a second additional guide frame end longitudinally opposite the first additional guide frame end, the additional guide frame coupled at the first additional guide frame end to a second end of the first guide frame longitudinally opposite the first end of the first guide frame; and a guide profile head configured to be detachably fastened to one of the second end of the first guide frame and the second additional guide frame end.