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A crash bar (also known as a panic exit device, panic bar, or bump bar) [1] [2] is a type of door opening mechanism which allows users to open a door by pushing a bar. While originally conceived as a way to prevent crowd crushing in an emergency, crash bars are now used as the primary door opening mechanism in many commercial buildings.
Carl Jacob Prinzler (June 6, 1870 – May 30, 1949) was an American engineer who invented the "panic bar" device for doors that allowed them to be opened from the inside despite being locked on the outside.
Another device for smaller domestic doors used a loop of rope or skein fixed to the door frame, that was twisted, with a piece of wood placed in between the twists to push the door. The opening of the door twists the skein further, when the door is released the rope's torsional force pushes the arm back against the door, thereby closing it. [5] [6]
In some old houses, the little doors are designated storage space for a card table! These small spaces were meant to keep card tables—which almost everyone had in the 1950s—tucked away neat ...
Another type of lock also called a police lock and also formerly made by the Fox Police Lock Company is the crossbar police lock. It features two steel bars across the width of the door and beyond, held by two brackets set in the doorframe. [1] [3] When the door is unlocked, the bars are moved inwards to the point of being withdrawn from the ...
Some sliding doors run on a wall-mounted rail, like this one Sliding doors in a modern wardrobe. The 'top-hung' system is most often used. The door is hung by two trolley hangers at the top of the door running in a concealed track; all the weight is taken by the hangers, making the door easier to move.
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