| 摘要 |
PURPOSE: A multi-stage lifting apparatus is provided to increase the driving efficiency of the lifting apparatus by maximizing the lifting height. CONSTITUTION: A multi-stage lifting apparatus comprises a housing(10), a rotary shaft(20), a first lifted body(30), a first rack gear(40), a second pinion gear(50), a second pinion gear(60), a second rack gear(70), and a second lifted body(80). The rotary shaft is installed the housing and rotates by receiving the driving force of the drive motor. The first lifted body ascends and descends along the longitudinal direction of the rotary shaft. The first rack gear is inserted inside of the first elevated body to the location near the rotary shaft. The first pinion gear is geared with the first rack gear and is rotated when the first lifted body elevates. The second pinion gear receives the driving force of the first pinion gear. The second rack gear with the second pinion gear and elevates. The first lifted body combined with the second rack gear ascends and descends along the elevation of the second rack gear. The second elevated body is ascended and descended by communicating with the first lifted body. |
