| 摘要 |
The invention relates to a window having a frame and a sash 50 slideable in the frame, wherein movement of the sash is controlled by a pair of lead screws 35, 40 having travelling nuts 42, 44 fastened to opposed sides of the sash, and by a common drive 10 connected to the lead screws for bringing about simultaneous rotation of said lead screws to effect sliding of the sash. Apparatus to convert existing windows is also disclosed. The drive may be controlled by a local controller for the window including microcontroller means having a stored program having routines for effecting raising or lowering of the sash. There may further be provided a system controller communicable with the local controller e.g. by a hard-wired link or by a radio or bluetooth link and having a stored programme for communicating with a group of local controllers for controlling several windows in a house or flats. |
