| 摘要 |
A lifting device includes a driving unit, a moving tube, and a rolling unit. The driving unit includes an activating shaft having one end connected to an external object, a sleeve being fixed around the activating shaft and having axially extending flat surfaces, an activating cylinder connected to an opposite end of the activating shaft for driving the activating shaft to move with respect to the sleeve, and a controlling member connected to the activating cylinder for controlling the activating cylinder. The moving tube is mounted around the sleeve and connected to the external object. The movement of the activating shaft synchronously makes the moving tube move upward or downward. The rolling unit includes a plurality of rollers that are rotatably attached to the moving tube and maintain contacting the flat surfaces of the sleeve. Thereby, the lifting device lifts and lowers the external object stably. |
| 主权项 |
1. A lifting device for lifting and lowering an external object, the lifting device comprising:
a driving unit including an activating shaft that has one end connected to a bottom of the external object, a sleeve that is fixed around the activating shaft, an activating cylinder that is connected to an opposite end of the activating shaft and drives the activating shaft to expand and retract with respect to the sleeve, and a controlling member that is connected to the activating cylinder and controls operation of the activating cylinder, wherein the sleeve has at least two axially extending flat surfaces; a moving tube being mounted around the sleeve and having one end connected to a bottom of the external object, so that when the activating shaft expands or retracts with respect to the sleeve the moving tube is synchronously driven to move upward or downward; and a rolling unit including a plurality of rollers that are rotatably attached to the moving tube and maintain contacting the flat surfaces of the sleeve, wherein each said roller has a barrel, an axle that passes through the barrel and has two ends affixed to the moving tube, and two bearings that are separated and connected between the barrel and the axle so as to allow the barrel to rotate about the axle. |
