In TV shows people are always taking the doorknob away to trap people in rooms and such…how does this not just allow the door to swing open and/or how can the trapped people not just stick their fingers in the hole to pull back the piece that goes in the wall?
In: Engineering
Before the popular Kwikset design, mortise mechanisms standardized on a 1 cm wide square hole that was rotated 90˚ to unlatch the door. It’s pretty hard to turn a hole with this size, given the strong springs that were also popular in the past, unless you have a tool that fits inside it.
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