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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 ...
In a horizontal or vertical cable rail, the cables, once tensioned must be rigid enough to prevent a 4-inch sphere passing through it. Factors influencing this rigidity are: the tension of the cable, intermediate posts (or cable spacers) spacing, the diameter of the cable, top rail cap material and the cable to cable spacing. [ 7 ]
Good lighting is important in a staircase so users see where they are going and to prevent falls. [6] There is often a window on the wall to let in daylight.In many cases, indoor stairs are placed far inside the building structure, and it is often not easy to get access to a wall on the outside where it would be natural to have a regular window for letting daylight in.
With 12.2% of Americans struggling to walk or climb stairs, a stair lift can make a major difference in accessibility at home. Those who face mobility issues, such as seniors, people recovering ...
The horizontal distance between steps is reduced by a factor less than two if for construction reasons there are narrow "unused" step extensions. These stairs often (including this example) illustrate the mathematical principle of glide plane symmetry: the mirror image with respect to the vertical center plane corresponds to a shift by one step.
For sufficiently wide stairs, a rail is mounted to the treads of the stairs. A chair or lifting platform is attached to the rail. A person gets onto the chair or platform and is lifted up or down the stairs by the chair which moves along the rail. Stair lifts are known variously as stairlifts, stair-lifts, chair lifts, stair gliders and by ...
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