| 摘要 |
A door latch having an adjustable backset position which allows it to be used in doors having either a 2 3/8" backset or a 2 3/4" backset. The latch includes a latch housing having two longitudinally spaced apart openings in communication with each other via a passageway. A cam is movable between the two openings through the passageway to adjust the backset. The cam cooperates with a retract slide which is engaged at its front end with the latch bolt to retract the latch bolt. The retract slide contains two sets of teeth at its back end, one set of teeth being engaged by the cam when it is in a first backset position and the second set of teeth being engaged by the cam when it is in a second backset position. The door latch also has a burglary deterrent feature comprising a dead bolt bar assembly which is in a retracted position when the door is closed and in an extended position when the door is open. The dead bolt bar assembly includes a blocker plate which, when the dead bolt bar is in a retract position, is activated by the dead bolt bar and prevents retraction of the latch bolt.
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