| 摘要 |
<p>A latch assembly comprises a casing and a latchbolt mounted in the casing. The latchbolt includes a head assembly (2) movable between an extended position in which the head assembly projects out of the casing through an opening in the casing, and a retracted position in which the head assembly is contained at least substantially within the casing, the head assembly being biased toward the extended position by a spring (9). The head assembly (2) of the latchbolt is biased (8) into a first condition in which it is able to operate as a conventional chamfered latchbolt. The head assembly (2) is cammed from the extended position into the retracted position when a first side of the latchbolt head assembly is subjected to a lateral force in a first direction (I) and the latchbolt head assembly is resistant to being cammed from the extended position into the retracted position when a second side of the latchbolt head assembly, opposite to the first side, is subjected to a lateral force in a second direction (II) opposite to the first direction. The head assembly (2) of the latchbolt is able to be transformed against the bias (8) into a second condition in which the head assembly is cammed from the extended position into the retracted position when the second side of the latchbolt head assembly is subjected to the lateral force in the second direction (II).</p> |
