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. 02, 1977
Filed:
Jul. 14, 1976
Applicant:
Inventor:
Louis F Ray, Baton Rouge, LA (US);
Assignee:
Other;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B66C / ; B66C / ;
U.S. Cl.
CPC ...
212 47 ; 212-2 ; 214-2 ; 212 48 ; 212 63 ;
Abstract
A horizontal gantry centered on the vertical tower of a crane supports on each side of the tower trolleys which move in unison in opposite directions at similar speed towards and away from the tower. Bulk material buckets are suspended from respective trolleys by vertical hoist cables. Sensors sense the loads of the buckets which are then compared, and the hoist and trolley drive motors are controlled to maintain load equilibrium on the crane to permit the buckets to be raised and the trolleys moved only when substantially equal loads are carried by the buckets.