| 摘要 |
A lifting assembly may include a base frame; a support assembly coupled to the base frame wherein the support assembly may include a rotating member pivotally coupled to the base frame; a support arm coupled to the rotating member; and a lifting arm coupled to the support arm; and a lifting mechanism that may include a roller shaft; a link arm pivotally coupled to the roller shaft and the support arm; a roller coupled to the roller shaft and the link arm; and a screw coupled to the base frame and threadably coupled to the roller shaft. |
