| 摘要 |
The present invention relates a jack assembly that may be lifted rapidly. A secondary shaft is mounted in a lifting column, and has a distal end screwed into an axial hole in the base. The main oil path is provided with a lower ball and an upper ball, and has a first oil hole connected to the oil hole of the secondary shaft, and a second oil hole connected to the inner oil chamber. The hydraulic oil pushes away the lower ball to flow through the first oil hole into the secondary shaft, so that the lifting column that has not worked may be lifted rapidly. The lifting column may work to increase the pressure of the hydraulic oil which flows through the second oil hole into the inner oil chamber, so that the lifting column may have a sufficient lifting force to lift an object.
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