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. 24, 2001
Filed:
Jan. 06, 1999
Martin Heusser, Munich, DE;
Abstract
In a stacker control of a stacker (fork lift) for high storage racks comprising a swing-shift fork (G) which is pivotable about a vertical axis (,) and horizontally movable in computer-assisted fashion by hydraulically controlled hydraulic motors (H,, H,) via a directional control valve (W,, W,) which is connected to a joint source of pressure (,, P), a three-way pressure balance (D) is provided between the source of pressure (,) and the directional control valves (W,, W,) for giving priority to one of said hydraulic motors (H,, H,). the three-way pressure balance (D) being controlled by control pressures tapped upstream and downstream of the directional control valve, at least the directional control valve of the preferential hydraulic motor having an open zero position, and the three-way pressure balance (D) forming part of a neutral circulation circuit (U) led via the control piping of the further hydraulic motor from the source of pressure to tank.