Lifting device
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United States of America Patent
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Aug 29, 2017
Grant Date -
Mar 23, 2017
app pub date -
Sep 17, 2015
filing date -
Sep 17, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
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.
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