| 摘要 |
A shoe is mounted between a frame and a sash of a window. The shoe has braking means that begin to engage almost immediately as the sash is rotated relative to the frame to prevent the sash from sliding relative to the frame. The shoe has a secondary means to assist in activating the braking means as the sash is rotated relative to the frame. When the sash is aligned with the frame, the braking means is automatically released and the sash and shoe can slide relative to the frame. The shoe and a projection that can engage with an indentation in the sash. The shoe has second engagement means that can engage with fourth engagement means on the sash to allow the sash to pivot relative to the shoe.
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