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US 12,145,828 B2Granted
Synchronized hybrid clamp force controller for lift truck attachment
AssigneeCascade Corporation
InventorChristopher M. Walthers
Life of this patent
Estimating the term…
Abstract
A hydraulic control circuit operable to selectively hydraulically link first and second hydraulic actuators and to bypass that hydraulic link.
Claims20
A hydraulic control circuit comprising:
- an input port configured to receive pressurized fluid from a pump and return unpressurized fluid to a reservoir;
- a first output port connectable to a first hydraulic actuator and a second output port connectable to a second hydraulic actuator, each of the first output port and the second output port configured to receive pressurized fluid from the input port and also configured to simultaneously deliver said pressurized fluid to its respectively connected hydraulic actuator and receive fluid discharged therefrom;
- and
- a selector capable of selectively causing any fluid discharged into the first output port to be delivered from the second output port;
- wherein
- the first output port and the second output port are each configured to deliver said pressurized fluid from the input port to a respectively connected hydraulic actuator regardless of whether the selector causes fluid discharged into the first output port to be delivered from the second output port.
3 more elements
A hydraulic control circuit connected to first hydraulic actuator and a second hydraulic actuator, the first hydraulic actuator having a head side area equal to the rod side area of the second hydraulic actuator, the hydraulic control circuit comprising:
- an input port configured to receive pressurized fluid from a pump and return unpressurized fluid to a reservoir;
- a first output port connectable to the first hydraulic actuator and a second output port connectable to the second hydraulic actuator, each of the first output port and the second output port configured to receive pressurized fluid from the input port and also configured to simultaneously deliver said pressurized fluid to its respectively connected hydraulic actuator and receive fluid discharged therefrom;
- and
- a selector capable of selectively causing fluid discharged from the first hydraulic actuator to be delivered into the second hydraulic actuator;
- wherein
- the first output port and the second output port each deliver said pressurized fluid to the first hydraulic actuator and the second hydraulic actuator, respectively, to achieve synchronous extension and retraction movement of the first hydraulic actuator and the second hydraulic actuator.
3 more elements
Dependencies are inferred from the claim text.