| 摘要 |
Hardware for a door or window, in which the closure can be moved out of the opening in the stationary frame to another position parallel to the said opening and then moved horizontally to a position that is non-coextensive with the opening. Upper and lower swing arms are provided, each connecting the closure to a traveling carriage. A releasable locking device is provided to lock the closure in the outer position, the device having a supporting lever connecting the swing arm to the carriage. This lever is brought into working position during the movement of the closure by means of a control lug with a thrust abutment located on the frame. The supporting lever consists of a bell crank pivotally mounted on the carriage, which crank carries the control lug at the end of one arm directed toward the stationary frame. The other arm, extending toward the swing arm, is pivotally connected to a connecting rod which is also swingably connected to the swing arm. The connecting rod and the bell crank that is connected to it from a toggle that is reversible by use of the control lug and a thrust abutment on the stationary frame. This occurs automatically at its extended position when the closure moves toward its closing position, releasing the swing arm from the position in which it is locked by an over-center condition of the toggle.
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