| 摘要 |
A sliding sash window has a pair of panels 2 sliding in a frame 1, the panels being connected by a cable so that movement of one causes a corresponding movement of the other. The usual operating ratio is 2:1 but, at a selected point, this is changed to 1:1 by a ratio conversion unit 5, which changes the position of the inner panel cable anchor point 4 thus balancing both window panels and eliminating the use of counterweights. The ratio conversion unit 5 may comprise a main body 9, on a mounting bracket 8, a cable pulley 6, and an anchor point 4 mounted on a movable pin 10 tensioned by spring 7.
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