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Crash bar
A crash bar (also known as a panic bar, exit device,〔American National Standards Institute, ANSI/BHMA A156.3-2001, American National Standard for Exit Devices〕 panic device,〔California Code of Regulations, Title 24, Part 2, "California Building Code." 1008.1.9〕 or a push bar) is a device for unlocking a door during emergency conditions. The mechanism consists of a spring-loaded metal bar fixed horizontally to the inside of an outward-opening door. When the lever is either pushed or depressed, it activates a mechanism which unlatches the door allowing occupants to leave quickly from the building.〔
==Background==
Following the events of the Victoria Hall disaster in Sunderland, England in 1883 in which more than 180 children died because a door had been bolted at the bottom of a stairwell, the British government began legal moves to enforce minimum standards for building safety. This slowly led to the legal requirement that venues must have a minimum number of outward opening doors as well as locks which could be opened from the inside.
However these moves were not globally copied. For example, in the United States, 605 people died in the Iroquois Theater Fire in Chicago in December 1903 because iron gates blocked exits.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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