| 摘要 |
<p>Disclosed is a closure mechanism for use in a window or door system. The window or door system comprises a frame incorporating at least one receiving keep for mounting in a window or door aperture. The frame is pivotally coupled to a leaf by at least one hinge that permits movement of the leaf relative to the frame between closed and open positions. The leaf incorporates the closure mechanism for retaining the leaf in the closed position with respect to the frame. The closure mechanism incorporates a shoot bolt mechanism (100) comprising at least one shoot bolt (102) operable to engage respective receiving keeps (106) in the frame when the leaf is shut in the closed position. At least one shoot bolt (102) has a first surface feature (104) that will engage a second surface feature (108) formed within the respective receiving keep(s) (106) should any attempt be made to force the leaf away from the frame when the window or door is closed. Attempting to force the window or door open causes the first (104) and second surface features (108) to positively interact in order to impede the tendency of shoot bolts (102) to withdraw from their respective receiving keeps (106).</p> |
