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:
Dec. 11, 1990
Filed:
Mar. 23, 1989
Rudolf Becker, Ehingen/Donau, DE;
Liebherr-Werk Ehingen GmbH, Donau, DE;
Abstract
A mobile crane is disclosed which comprises a telescopic boom, which is pivoted to the rotating superstructure or rotating deck of the crane and is adapted to be luffed by a luffing cylinder, which is pivoted to the boom and the rotating deck. A guying yoke is pivoted on the rear of the telescopic boom near the middle of its base box. Two axially aligned spaced apart rope pulleys are rotatably mounted at the outer end of the guying yoke. A reversing rope pulley is provided adjacent to the top end of the telescopic boom. Also, a winch is provided with a rope, which serves to guy the telescopic boom and extends around one rope pulley of the guying yoke to the upper reversing rope pulley and back around the other rope pulley of the guying yoke to a fixed point. The winch and the point to which the rope is fixed are disposed on mutually opposite sides of the telescopic boom adjacent to the pivotal axis of the boom. The guying yoke is restrained by a hydraulic piston-cylinder unit, which is pivoted at one end to the guying yoke above the pivotal axis of the latter and is pivoted at the other end to the base box near the middle thereof between the pivotal axes of the guying yoke and the telescopic boom.