A low-profile trailer jack reduces the height of the jack above the trailer a-frame by over 50% eliminating pickup tailgate interference when lowered by a vehicle operator. This is accomplished using a two-stage concentric lead screw design rather than a single screw as described in prior art. The two-stage design also allows for increased lowering and raising speed of the jack foot by using the first stage, which is a larger outer screw with larger pitch, generating a faster speed when no load is present. The second stage inner screw is engaged when a load is present and a slower speed with greater mechanical advantage is required.
Low-profile a-frame trailer jack
21.03.2023
Patent
Elektronische Ressource
Englisch
IPC: | 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 / 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 |