| 摘要 |
An extra-long deadlocking door latch or longlatch is arranged to fit and operate within the normal latch bolt openings provided in a standard pre-cut residential or commercial door, in the presence of two transverse bolts which pass through the transverse hole in the door to hold inside the outside door knob assemblies securely against the door so that an intruder cannot pry off the outside assembly and thus gain entry. The longlatch is arranged to protrude at least one inch out from the door and into a latch holder in a door frame. Two springs are located above the transverse bolts and extend into the door beyond both transverse bolts. The two springs, or just one of the springs, can move the longlatch one inch or more from the fully withdrawn position to the fully extended position. The longlatch is brought to the fully extended position in precisely the same way as is done with a conventional deadlocking latch, i.e., the inside door knob assembly is set to its locked position and the door is simply pulled closed from the outside, resulting in a deadlocked state with the longlatch extending at least one inch from the door, and into the latch holder. The longlatch is mounted in a cylinder which extends not only through the normal hole from the edge of the door, but also most of the way through the larger transverse hole provided in a pre-cut door, which is aligned with the usual position of the door knob.
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