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

Claim 4:
5. An industrial truck comprising:
a lift mast comprising
at least one mast lift stage driven by at least one mast lift cylinder, and
a free lift stage having a load receiving means driven by at least one free lift cylinder such that the load receiving means is displaceable along the lift mast; and

a hydraulic system for supplying a hydraulic fluid to and for unloading the hydraulic fluid from the at least one mast lift cylinder and the at least one free lift cylinder;
wherein the hydraulic system comprises a control programmed to actuate the at least one mast lift cylinder and the at least one free lift cylinder such that, in a load lowering operation, the mast lift stage and the free lift stage
(i) simultaneously start retracting, and
(ii) continue to simultaneously retract until one of the mast lift stage and the free lift stage is completely retracted.