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A stair tread is the horizontal portion of a set of stairs on which a person walks. The tread can be composed of wood, metal, plastic, or other materials. In residential settings, treads can be covered in carpeting. Stair treads can come in non-slip varieties, particularly in commercial or industrial locations. [1]
The alternating stairs (3) requires one unit of space per step: the same as the half-width stairs (2), and half as much as the full-width stairs (1). Thus, the horizontal distance between steps is in this case reduced by a factor of two, reducing the size of each step.
The track system is built into the truss to guide the step chain, which continuously pulls the steps from the bottom platform and back to the top in an endless loop. One track guides the front wheels of the steps (called the step-wheel track) and another guides the back wheels of the steps (called the trailer-wheel track).
Codes also generally require that there be a 1 + 1 ⁄ 2 inches (38 mm) clearance between the underside of the handrail and any obstruction—including the horizontal bracket arm. There is an allowance however for variations in the handrail size—for every 1 ⁄ 2 inch (13 mm) of additional perimeter dimension over 4 inches (102 mm), 1 ⁄ 8 ...
Mobile safety steps, sometimes called warehouse steps, are mobile structures with steps up to a platform. The steps use wheels or casters , making them easy to move. They have the advantage over standard ladders in that the operative can have one hand free when moving up and down the steps and both hands free if there is a top-level platform.
The handrails work in a similar manner, and because of this, there is no need to hold the handrails when entering or exiting the walkway. It moves at roughly 2 km/h (1.2 mph) when riders step onto it and speeds up to approximately 7 km/h (4.3 mph), which it remains at until near the end, where it slows back down.
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