A hydraulic jack configured to be attached to a trailer and operable with a hydraulic power unit having an extend line and a retract line. The hydraulic jack may include a working cylinder and a valve body coupled to the working cylinder. The valve body may provide for a locking valve to be installed within the valve body and include a pilot port. The locking valve may be operable to allow substantially free hydraulic fluid flow in a first direction from the extend coupler to the working cylinder. The locking valve may be further operable, under control of the pilot port, to allow substantially free hydraulic fluid flow in a second direction from the working cylinder to the extend coupler when hydraulic pressure is present at the pilot port and to substantially prevent hydraulic fluid flow in the second direction from the working cylinder to the extend coupler when hydraulic pressure is not present at the pilot port.
JACK WITH HYDRAULIC LOCK
2024-10-10
Patent
Electronic Resource
English
IPC: | B66F HOISTING, LIFTING, HAULING, OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD , Hub-, Verhol- oder Schubvorrichtungen, soweit nicht anderweitig vorgesehen, z.B. Vorrichtungen mit unmittelbarer Krafteinwirkung auf die Last / B60D Fahrzeugverbindungen , VEHICLE CONNECTIONS / B60S SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR , Warten, Reinigen, Instandsetzen, Unterstützen, Anheben oder Rangieren von Fahrzeugen, soweit nicht anderweitig vorgesehen / F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein |
BOOM-ADJUSTABLE HORIZONTAL HYDRAULIC JACK WITH A PULL-LOCK MECHANISM
European Patent Office | 2015
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