Load-settable rapid lifting jack
AssigneeShinn Fu Corporation
InventorVictor Hung
Life of this patent
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Abstract
A load-settable rapid lifting jack comprises a switching oil cylinder between a pump oil chamber and an inner oil tank. A little and limited hydraulic oil in the pump oil chamber is utilized to push a switching piston as the hydraulic oil flows into the switching oil cylinder; and a larger amount of hydraulic oil is provided to the inner oil tank of the jack so that the jack lifting spindle is lifted rapidly in a predetermined load. Moreover, when the load is over a rated value, a sequential valve can be opened rapidly so as to restore to a general lifted speed.
Claims15
A load-settable rapid lifting jack comprising a switching oil cylinder between a pump oil chamber and an inner oil tank;
- wherein little and limited hydraulic oil in the pump oil chamber is utilized to push a switching piston as the hydraulic oil flows into the switching oil cylinder;
- and a larger amount of hydraulic oil is provided to the inner oil tank of the jack so that the jack lifting spindle is lifted rapidly in a predetermined load.
Dependencies are inferred from the claim text.