Patent ID: 11905153
Assignee: JUNGHEINRICH AKTIENGESELLSCHAFT
Field: Handling (Mechanical engineering)
Classification: CPC B  F | IPC B

Claim 7:
8. The method according to claim 6, wherein the hydraulic system includes a hydraulic pump that is integrated in a hydraulic feed line, wherein the at least one mast lift cylinder and the at least one free lift cylinder are exposed to pressurized hydraulic fluid in the load lifting operation, wherein the hydraulic feed line branches between the hydraulic pump and the lift cylinders into a first and a second supply branch, wherein the first supply branch runs to the free lift cylinder, wherein the second supply branch runs to the mast lift cylinder, wherein a lifting valve in the form of a proportional valve, with which a ratio between a volumetric flow in the first and in the second supply branch is changeable, is integrated in the hydraulic feed line, wherein the free lift cylinder has a first cross-section and the mast lift cylinder has a second cross-section, wherein the first cross-section is larger than the second cross-section, wherein the lifting valve is integrated in the first supply branch, and wherein the method further comprises activating the lifting valve via the control for the hydraulic system such that the free lift cylinder and the mast lift cylinder are simultaneously extended throughout the load lifting operation.