| 摘要 |
In a hydraulic lifting-lowering-system for a working table, a couch or lying furniture or another heavy object, the height level or position it is frequently desired to adjust or change, said system comprising a predetermined amount of hydraulic fluid, a hydraulic fluid accumulator (5), the fluid pressure of which on the hydraulic fluid side is adjustable, a single acting hydraulic cylinder (1, 6, 7, 10, 11, 12, 17) with two end caps (10, 12), a piston pressure chamber (17) and a piston rod (6) which via a piston rod sealing ring (11) extends sealingly out through the one end cap (10) of the cylinder, where the piston pressure chamber (17) is pressure fluid connected to the hydraulic fluid side of the accumulator (5), said system including the combination that the hydraulic cylinder (1, 6, 7, 10, 11, 12, 17) is of the plunger piston type, and that the cylindric tube (1) of the hydraulic cylinder is slideably and telescopically mounted in a cylindrical guiding tube (2), which surrounds the piston rod in its entire length and is rigidly secured to the one end of the piston rod via a cross plate (3A) or similar construction part. Thus, a simple and stable and reliable system is achieved without the need for crank handles, and by which new system the force applied from the plunger piston rod will be essentially constant in all positions of the piston rod at a given load, seeing that the operational manual force necessary for height adjustment of the heavy object becomes low.
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