초록 ▼

An automatic door latch is disclosed. In a preferred embodiment, the latch includes a dead bolt which is automatically moved from a partially retracted or trigger position to a fully extended locking position when a door in which the lock is mounted is closed. When a key is used to unlock the dead b

An automatic door latch is disclosed. In a preferred embodiment, the latch includes a dead bolt which is automatically moved from a partially retracted or trigger position to a fully extended locking position when a door in which the lock is mounted is closed. When a key is used to unlock the dead bolt from outside of the door, or a finger turn or key is used to unlock the dead bolt from inside of the door, the dead bolt is automatically reset to the trigger position. In a preferred embodiment, the dead bolt lock includes a multi-position switch mounted in the lock housing which engages a contact member mounted on the dead bolt. Retraction of the dead bolt into the housing causes the multi-position switch to engage the contact member and to secure the dead bolt in the trigger position. Subsequent retraction of the dead bolt into the housing causes the multi-position switch to disengage from the contact member, thereby allowing the dead bolt to extend from the housing to the locked position. In a preferred embodiment, a latch restraint assembly is provided which holds the dead bolt in the fully retracted position until the restraint assembly is manually released. The automatic door latch comprises relatively few component parts in comparison with conventional locks, and is preferably compatible with standard predrilled door cut-outs.

대표청구항 ▼

[ What is claimed is:] [27.] An automatic door latch comprising:a housing adapted for mounting in a door;a latch retractably mounted in the housing and movable to an extended position, a partially retracted trigger position, and a fully retracted position;a spring biasing the latch toward the extend

[ What is claimed is:] [27.] An automatic door latch comprising:a housing adapted for mounting in a door;a latch retractably mounted in the housing and movable to an extended position, a partially retracted trigger position, and a fully retracted position;a spring biasing the latch toward the extended position;means mounted inside the housing for holding the latch in the partially retracted trigger position when the door is open, and for allowing the latch to move to the extended position when the door is closed, wherein said means mounted inside the housing remains inside the housing when the latch is in the extended position; andmeans for dogging the latch in the extended position.