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The sliding bolt, when extended, mechanically prevents operation of a switch, valve, gate, or other device. Many variations exist, with different shapes of interlock bolt and multiple lock cylinders on an interlock. A significant feature of the interlock is that the key is held or trapped in one position of the lock.
Trapped key interlock switchgear door. An interlock is a feature that makes the state of two mechanisms or functions mutually dependent. It may consist of any electrical or mechanical devices, or systems. In most applications, an interlock is used to help prevent any damage to the machine or to the operator handling the machine.
Smart Start Inc. was founded and incorporated in September 1992 in Dallas–Fort Worth by Bettye Rodgers and Jay D. Rodgers under the name “1A Smart Start, Inc.” [1]. On August 21, 2015, 1A Smart Start, Inc. was acquired by ABRY Partners, becoming 1A Smart Start, LLC. [2]
Interlocking is a safety measure designed to prevent signals and points/switches from being changed in an improper sequence. For example, interlocking would prevent a signal from being changed to indicate a diverging route, unless the corresponding points/switches had been changed first.
In 2001 the company was acquired by Tyco International, [7] and in 2011 it changed its name from Scott Health and Safety to Scott Safety. [8] In 2014 Scott Safety acquired the gas and flame protection company Industrial Safety Technologies for $329.5 million. [5] In 2017, 3M entered negotiations to acquire Scott Safety for $2 billion. [9]
An SIS performs a safety instrumented function (SIF). The SIS is credited with a certain measure of reliability depending on its safety integrity level (SIL). The required SIL is determined from a quantitative process hazard analysis (PHA), such as a Layers of Protection Analysis (LOPA). The SIL requirements are verified during the design ...
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