| 摘要 |
<p>A lock for a door or the like has a casing (1) and a deadbolt assembly which comprises a bolt (5) and a drive mechanism in the form of a cam (9) of a cylinder lock (10) which is adapted to be operated by a key. The drive mechanism is arranged to drive a coupler (11) which is guided for sliding movement in the casing (1) between a withdrawn position in which the bolt (5) is located substantially wholly within the casing (1) and an extended or thrown position in which a portion of the bolt (5) projects from the casing (1). A lever in the form of a link (16) is arranged between the coupler (11) and the bolt (5), the link (16) being pivotally mounted in the casing (1) and provided with first engagement means in the form of a pin (19) which is engageable in a slot (15) in the coupler (11) and second engagement means in the form of a slot (18) which is arranged to engage with a pin (20) on the bolt (5). The arrangement is such that, when the bolt (5) is in the withdrawn position and the coupler (11) is engaged by the cam (9) to move the bolt (5) to the thrown position, the link (16) is engaged by the coupler (11) and is effective to increase the movement of the bolt (5) relative to the movement of the coupler (11) thereby to increase the throw of the bolt.</p> |
