| 摘要 |
PURPOSE:To enable it to open or close the window automatically by connecting a hydraulic cylinder contacted with a window frame supporting link, to a feeder for feeding a fluid which is controlled with pressure balancing the weight of a window frame as a base, supplying this pressure-controlled fluid to the cylinder and then balancing it with dead load of the window frame. CONSTITUTION:A push rod 13 of a hydraulic cylinder 12 goes up by dint of a pressure fluid out of a feed pipe 16, while an intermediate home position of a window frame supporting link 9 is set down to an input point via a push plate 14 at the tip and a roller 15, thereby giving its pushing force to a window frame 2. When a fixed fluid controlled under pressure is fed to the cylinder 12, the specified balance pressure, namely, the specified force congruent with dead load of the window frame irrespective of a stroke position of the cylinder 12 is securable. Accordingly, since it is balanceable in a range of the whole stroke of the cylinder 12, pressure in the pressure fluid can be set to the base pressure. Then, hydraulic pressure to be given to the cylinder 12 is changed, so that every action including a balance with the dead load of the window frame and opening and closing motions of this frame can be done according to the purpose. |
