A jack, comprising: a top plate having at least one adapter block mounted thereon and adapted to contact a load; a base plate positioned below the top plate; the top plate movable between a lowered position and a raised position to thereby lower and raise the load; and, at least one locking assembly adapted to lock the top plate in the raised position; wherein the at least one locking assembly includes a locking bar and a ratchet rack, the locking bar having an upper end and a lower end, the locking bar hinge mounted at the upper end proximate to the top plate, the ratchet rack inclining upward at an acute angle from the base plate toward the top plate and having at least one notch formed therein, the at least one notch adapted to receive and lock the lower end of the locking bar, and the lower end of the locking bar slidable up the ratchet rack and into the at least one notch as the top plate is moved from the lowered position to the raised position; wherein the ratchet rack is stationarily attached to the base plate; and, wherein a top adapter plate of the at least one adapter block is operable to slide between first and second positions on the top plate as the load is raised and lowered to thereby maintain alignment of the top and base plates below the load.
Telescoping jack for lifting large capacity trucks
2024-01-18
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 |