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. 14, 2025
Filed:
Jun. 27, 2023
Linde Material Handling Gmbh, Aschaffenburg, DE;
Still Gmbh, Hamburg, DE;
Markus Schwab, Mölln, DE;
Ulrich Knechtel, Erlenbach a. Main, DE;
Linde Material Handling GmbH, Aschaffenburg, DE;
STILL GmbH, Hamburg, DE;
Abstract
A hydraulic system for an industrial truck with a lifting frame has at least one telescoping mast that can be raised and lowered in a stationary mast and a load handling means that can be raised and lowered in the telescoping mast. The hydraulic system has a free lift cylinder for raising and lowering the load handling means and at least one mast lift cylinder for raising and lowering the telescoping mast. A control valve device is provided for the control of the lifting operation and the lowering operation of the free lift cylinder and of the mast lift cylinders. A mast transition damping device is provided that includes at least one electrically actuated proportional valve. The proportional valve of the mast transition damping device, in the unactuated state, has a throttling connection that effects a throttled volume flow, and in the event of an electrical control action, can be actuated toward an open position.