Patent 7204379 was granted and assigned to Palfinger on April, 2007 by the United States Patent and Trademark Office.
A crane has at least one telescopic crane arm with at least two sliding arms that are moveable against each other. At least one gliding element, which is housed in a frame in a detached and unfastened manner, is arranged between the sliding arms. The gliding element has a separate spring element projecting from the gliding surface of the gliding element.