| 摘要 |
An elevational adjustment device comprises an object to be supported; at least one cylinder assembly located below the object to be supported for supporting the object to be supported; each of the cylinder assembly including: an inner tube surrounding the spindle; a bottom of the inner tube being installed with a valve block; the valve block having an opening; the enlarged portion at the lower end of the spindle sealing an opening of the valve block; a sub-tube surrounding the inner tube; a sleeve surrounding the sub-tube. The overall structure is divided into a first receiving chamber, a second receiving chamber and a third receiving chamber. Communication of the fluids in the receiving chambers are controlled so as to lift or descend the object to be supported.
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