| 摘要 |
An espagnolette mechanism 20 comprising a locking bolt member 28, 30, wherein movement between retracted and extended positions of the locking bolt involves rotary motion. The locking bolt 28 may be pivotally mounted for solely pivotal movement and locking bolt 30 may pivot about an axis which linearly moves. The locking bolt may include a pin sliding in a curved guide slot to constrain movement of the locking bolt (pin 104, slot 100, fig.13). The locking bolts may be driven between locking and unlocking positions by a rack and pinion assembly. Each keeper may include a lead in surface to guide initial entry of the locking bolt and may have multiple slots enabling a secure vent position. Locking bolts may be provided at multiple positions along the wing including the corner. In a further aspect an espagnolette mechanism comprises locking bolt which comprises a plurality of bolt portions (218a, 218c, fig.21) and a keep for receiving each bolt portion such that a plurality of parallel locking bolts may be provided each locatable in a separate keeper offset from each other. |
