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A handrail is a rail that is designed to be grasped by the hand so as to provide safety or support. [1] In Britain , handrails are referred to as banisters . Handrails are commonly used while ascending or descending stairways and escalators in order to prevent injurious falls, and to provide bodily support in bathrooms or similar areas.
The Sheet Metal Workers' International Association (SMWIA) was a trade union of skilled metal workers who perform architectural sheet metal work, fabricate and install heating and air conditioning work, shipbuilding, appliance construction, heater and boiler construction, precision and specialty parts manufacture, and a variety of other jobs involving sheet metal.
Part of this increase in desire for industrial workplace protection, was a growth in demand for safety guardrails. In the US, under OSHA Standard 1910.28(b)(15), employees who work on surfaces that are 4 feet (1.2 m) or higher off of the ground must have personal fall protection systems in place, such as handrails or guardrails. [7]
But, the 1920s also marked the beginning of an industrial shift for the sheet metal trade when Willis Carrier sold his invention for air-conditioning to movie-theater operators in 1922. By 1925 the system was cooling New York City 's Rivoli Theater , and within a few years air conditioners were being installed in restaurants, railroad cars, and ...
This 35 mm wide rail is widely used to mount circuit breakers, relays, programmable logic controllers, motor controllers, and other electrical equipment. The EN 60715 standard specifies both a 7.5 mm (shown above) and a 15 mm deep version, which are officially designated top hat rail IEC/EN 60715 – 35 × 7.5; top hat rail IEC/EN 60715 – 35 ...
The first rail rolling mill was established by John Birkenshaw at Bedlington Ironworks in Northumberland, England, in 1820, where he produced fish-bellied wrought iron rails in lengths of 15 to 18 feet. [9] With the advancement of technology in rolling mills, the size of rolling mills grew rapidly along with the size of the products being rolled.
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