| 摘要 |
A motor drives a threaded rod having a pair of hinged lever arms connected thereto. A pair of hinged lift arms are carried in notches in the terminal edges of the lever arms to increase the lifting capacity of the jack. The hinged lever arms are caused to be moved inwardly and outwardly in response to rotation of the threaded arm while the hinged terminal ends are simultaneously caused to be moved upwardly and downwardly.
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