| 摘要 |
<p>A cord (54) tensioned by a spring (26) supports the sash (60) of a hung window in a stationary position while the sash is maintained tilted into a building for cleaning the window's external surface. The cord pulls a pulley (32) attached to the spring, which extends as the sash is further tilted. A tubing (22) houses the spring and pulley and provides a stop that limits the maximum tilt of the sash.</p> |
