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Slotted angle
Slotted angle (also sometimes referred to as Slotted angle iron) is a system of reusable metal strips used to construct shelving, frames, work benches, equipment stands and other structures. The name derives, first, from the use of elongated slots punched into the metal at uniform intervals to enable assembly of structures fixed with nuts and bolts, and second, from the longitudinal folding of the metal strips to form a right angle.
==Invention==
Prototype slotted angle strips were developed by London-based engineer Demetrius Comino in the late 1930s,〔Darbyshire, Anthony, and Duckworth, Eric (2011), ''Demetrius Comino: A life and legacy of achievement'', Comino Foundation.〕 as he sought alternatives to conventional wooden shelving in his printing works. Comino owned an engineering business, Dexion Ltd, which began production in 1947 and the steel slotted angle strips eventually became known as Dexion.
The prior existence of Meccano prevented a generic patent〔Profile: Demetrius Comino "The secret is: think about first principles", ''New Scientist'', 25 July 1952, pp.20-21.〕 so Dexion patents were restricted to particular slot and hole configurations,〔e.g.: Rigid Angle Joint patent 2746780, Filing date 27 November 1951; issued 22 May 1956. http://www.google.com/patents/US2746780〕 and, seeking to emulate Dexion's success, other UK and European companies began offering different sizes, hole patterns and metal strip thicknesses.
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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