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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.
Electric strikes for rim panic exit devices are sometimes, though not always, 'no cut' electric strikes - no cutting, in reference to a rim panic strike, means the strike is bolted to the surface of jamb without cutting into the frame or modifying it in any way (except for the drilling and tapping of mounting screw and/or anchoring pins).
The other technologies are often manufacturer specific. These electromechanical devices come with 24-volt direct-current drive units which can run continuously without generating heat, so electromechanical bar gates can be operated continuously and in an intensive duty cycle. An automatic bar gate can be operated through: Push button; Key Selector
Exit control devices are often used in hospitals, and can be interfaced to wireless sensors worn by newborn children, so that all exits will lock if a baby is stolen from one of the hospital rooms. For example, if a newborn baby is removed from a specailized section of the hospital without proper exit procedures, all exit control locks in the ...
A device made of rigid, heavy gauge wire and designed to fit through the space between double-swinging equipped with panic hardware. [9] Jet-Axe A Jet-Axe was a shaped charge of two to six ounces of RDX, and was used for forcible entry [10] and ventilation in the 1960s and 1970s. Jet siphon