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:
Sep. 03, 1985
Filed:
Dec. 01, 1983
Roger D Luebke, Brown Deer, WI (US);
Harnischfeger Corporation, Brookfield, WI (US);
Abstract
The invention relates to a stacker crane comprising an upright rigid mast rotatably connected at its upper end to a horizontally movable trolley, an intermediate mast that is vertically movable relative to the rigid mast, and a load supporting carriage guided for vertical motion by both masts and raised and lowered by a winch on the trolley. The intermediate mast has an upwardly projecting pilot portion that is telescopingly received within the rigid mast to guide the intermediate mast for motion between a lowered position near floor level and a raised position wherein the top of the intermediate mast is contiguous to the bottom of the rigid mast. The carriage is guided by a pair of vertical rails on each mast, at its opposite sides, the rails on the intermediate mast being aligned with respective rails on the rigid mast. The intermediate mast is biased upward by a force that can be overcome by the weight of the carriage. Cooperating abutments on the carriage and the intermediate mast, engaged when the carriage is near the bottom of the intermediate mast, constrain the latter to move between its raised and lowered positions in unison with the carriage.