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:
Apr. 21, 1998
Filed:
Jan. 18, 1996
Mark R Unger, Hagerstown, MD (US);
Brian M Boeckman, Chambersburg, PA (US);
JLG Industries, Inc., McConnellsburg, PA (US);
Abstract
A drive system for a vertical mast personnel lift uses a pair of rear wheels that are fixed in an axial direction of a base portion of the personnel lift. When an operator input to make a turn is received, DC motors respectively connected to the right and left rear wheels are rotated at a different rate. Neither the front wheels nor the rear wheels are steered during the turning movement. The front wheels are configured as caster wheels, which are free to turn in any direction. In order to rotate the personnel lift about its central axis, the right rear wheel is rotated at a first rate in a first direction, and the left rear wheel is rotated at the first rate in a second direction opposite the first direction.