Automatic door latch

专利名称：Automatic door latch发明人：DONNA GALVIN申请号：AU4222399申请日：19990601公开号：AU4222399A公开日：19991230

摘要：An automatic door latch is disclosed. In a preferred embodiment, the latchincludes a dead bolt which is automatically moved from a partially retracted or triggerposition to a fully extended locking position when a door in which the lock is mounted isclosed. When a key is used to unlock the dead bolt from outside of the door, or a fingerturn or key is used to unlock the dead bolt from inside of the door, the dead bolt isautomatically reset to the trigger position. In a preferred embodiment, the dead boltlock includes a multi-position switch mounted in the lock housing which engages acontact member mounted on the dead bolt. Retraction of the dead bolt into the housingcauses the multi-position switch to engage the contact member and to secure the deadbolt in the trigger position. Subsequent retraction of the dead bolt into the housingcauses the multi-position switch to disengage from the contact member, therebyallowing the dead bolt to extend from the housing to the locked position. In a preferredembodiment, a latch restraint assembly is provided which holds the dead bolt in the fullyretracted position until the restraint assembly is manually released. The automatic doorlatch comprises relatively few component parts in comparison with conventional locks,and is preferably compatible with standard predrilled door cut-outs.

申请人：DONNA GALVIN

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