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:
Oct. 14, 1980
Filed:
Mar. 19, 1979
Applicant:
Inventors:
Fred Wiggershaus, Gevelsberg, DE;
Felix Schafer, Wetter, DE;
Assignee:
Mannesmann Demag A.G. Wolfgang-Reuter-Platz, Duisburg, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B66D / ;
U.S. Cl.
CPC ...
254270 ; 254277 ; 254264 ;
Abstract
A multi-unit hoist apparatus is provided having an overload arrangement in the form of reversible pressure medium cylinders connected to the fixed end of each hoist unit in the apparatus. Appropriate controls are incorporated into the pressure medium supply to each unit, whereby if the load becomes unbalanced the unit subjected to an overload is relieved when the overload reaches a specific preset level.