Patent ID: 11926514
Assignee: PALFINGER AG
Field: Handling (Mechanical engineering)
Classification: CPC B | IPC B

Claim 5:
6. The forklift according to claim 1, wherein the hydraulic system comprises:
a hydraulic fluid source for selectively supplying pressurized hydraulic fluid through a main control valve operable by the operating element;
a primary tilt system configured to tilt the mast in the primary tilting motion, wherein the primary tilt system comprises a primary hydraulic actuator for driving the primary tilting motion, the primary hydraulic actuator is a double acting hydraulic cylinder with a first chamber and a second chamber, and the primary tilting motion towards the inclined position is driven by pressurizing the second chamber of the primary hydraulic actuator with hydraulic fluid and the primary tilting motion towards the substantially upright position is driven by pressurizing the first chamber of the primary hydraulic actuator with hydraulic fluid; and
a secondary tilt system configured to tilt the fork carriage relative to the mast in the secondary tilting motion, the secondary tilt system comprises a secondary hydraulic actuator for driving the secondary tilting motion, the secondary hydraulic actuator is a double acting hydraulic cylinder with a first chamber and a second chamber, the secondary tilting motion towards the position in which the fork carriage is inclined relative to the mast is driven by pressurizing the first chamber of the secondary hydraulic actuator with hydraulic fluid and the secondary tilting motion towards the position in which the fork carriage is substantially aligned with the mast is driven by pressurizing the second chamber of the secondary hydraulic actuator with hydraulic fluid;
wherein to perform a hydraulic sequence control of the primary tilting motion and the secondary tilting motion for picking up a load:
the second chamber of the primary hydraulic actuator and the first chamber of the secondary hydraulic actuator are connectable or connected in parallel with each other and a first output port of the main control valve in a fluid conducting manner for simultaneous pressurization with hydraulic fluid upon actuation of said one operating element, and/or

wherein to perform a hydraulic sequence control of the primary tilting motion and the secondary tilting motion for setting down a load:
the first chamber of the primary hydraulic actuator and the second chamber of the secondary hydraulic actuator are connectable or connected with each other and a second output port of the main control valve in a fluid conducting manner for simultaneous pressurization with hydraulic fluid upon actuation of the operating element, and discharge of hydraulic fluid from the second chamber of the primary hydraulic actuator is hydraulically locked by a pressure relief valve to enable discharge of hydraulic fluid from the second chamber of the primary hydraulic actuator above a predetermined or predeterminable hydraulic pressure in the second chamber of the primary hydraulic actuator.