The idea of a simple machine originated with the Greek philosopher Archimedes, who studied the machines, lever, pulley, and screw, and discovered the principle of mechanical advantage in the lever. Furthermore, the Greek Philosophers defined the classic five simple machines, which were used to roughly calculate the mechanical advantages.
Working at height. Providing people with a suitable work platform for the task being undertaken reduces the risk of injury from falling from machinery and equipment. Often safe access equipment, made available during installation of machinery and/or equipment, is removed after commissioning.
Workplace managers may not have considered or recognised the need to provide similar means to gain safe access to parts of machinery and equipment at height, or in awkward locations for maintenance, repair, service or cleaning activities. Safe access at height can be broken into three categories. Each category has in common the need to provide a stable, safe platform suitable for the work to be undertaken, and to be equipped to support and retain a person within the confines of the platform.
• Guarding may also serve to mute noise emissions through application of sound absorbing materials. Other emissions, such as lasers, ultraviolet light, bright light or welding flash, can also be safely screened to prevent potential harmful exposure.
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