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:
May. 12, 1998
Filed:
Mar. 21, 1996
Applicant:
Inventors:
Frank Hellinger, Kunzelsau, DE;
Ari Vaisanen, Hyvinka, FI;
Assignee:
R. Stahl Fordertechnik GmbH, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B66B / ; B66B / ; B66C / ; B66C / ;
U.S. Cl.
CPC ...
318362 ; 318369 ; 187292 ; 187293 ; 187295 ;
Abstract
An electric drive for the vehicle or traveling mechanism of a lifting appliance contains a control which controls the switching on of the mechanical brake and the switching of the motor current off and on again. In this case, there is provision, in the event of a changeover from a high traveling speed to slow maneuvering speed, for the mechanical brake to remain released until the maneuvering speed is approached. During this phase, the vehicle is decelerated solely by the internal friction and the rolling friction on the rail, in order to avoid inducing any or any additional load pendulum oscillation.