| 摘要 |
A lifting pillar 20 or 26 for either a bed or other industrial applications has at least one hydraulic cylinder inside a telescopic, non-circular section guide 53, 54. The movement of the guide is smoothed by adjustable bearings 55 which limit the free play in the system. The guides can be of steel and the bearings of bronze. A guide disc (74, Fig 17) can be provided between the guides 53, 54. Preferably, a plurality of cylinders are provided and the top of the cylinder is connected to a surface 4 such as the bed by swivelling connections such as 30, 35. This allows lift and tilt in both the X and Y directions depending on the amount of raise of each cylinder. One of the joints 35 preferably allows swivelling in two directions and for this purpose has rollers (40, Fig 5) following a curved path (43) provided on a horizontally aligned plate 39. Preferably this is provided on a fourth lifting cylinder 26. Preferably the raising and tilting is controlled by valves (72, Figs 15, 16) and a tilt sensor (45, Fig 2). |
