The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 15, 2000
Filed:
Jun. 29, 1999
Klaus Becker, Wetter, DE;
Mannesmann AG, Dusseldorf, DE;
Abstract
A crane jib includes a main boom arranged on a support base for rotation about a vertical pivot axis, and an auxiliary boom extending the main boom at one end and movable with respect to the main boom by means of a first adjustment element. In order to realize a high degree of energy-efficiency and a stable jib at great reach of the jib, a pair of counterweights is provided which are supported at the other one of the ends of the main boom at an angle relative to one another and respectively positioned on both sides of a plane which extends vertically through the longitudinal main boom axis. The counterweights so interconnected to one another as to be swingable in synchronism by a second adjustment. A control device connects the first and second adjustment elements for balancing the variation in reach of the auxiliary boom through a change in reach of the counterweights.