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The basic lightweight tube scaffolding that became the standard and revolutionised scaffolding, becoming the baseline for decades, was invented and marketed in the mid-1950s. With one basic 24 pound unit a scaffold of various sizes and heights could be assembled easily by a couple of labourers without the nuts or bolts previously needed. [12]
This type of scaffold is generally used where extensive versatility is required. In many countries, it is common in construction . Horizontal tubes and walking decks can be placed at any height along the vertical tube (as permitted by engineering constraints), and vertical tubes, or legs, can be spaced at any distance apart, up to the maximum ...
size 2 from 6.5 feet (2.0 m) to 11 feet (3.4 m), size 3 from 8 feet (2.4 m) to 13 feet (4.0 m), size 4 from 10.5 feet (3.2 m) to 16 feet (4.9 m). The safe load for each prop depends upon the size and extension of the prop. Size 1, 2 and 3 props can take about 34 kN unextended, dropping progressively to less than half of that when fully extended.
ISO general purpose metric screw threads – Part 2: Nominal sizes for 0,2 mm, 0,25 mm and 0,35 mm fine pitch threads; nominal diameter from 1 mm to 50 mm: Active: DIN 13-3: ISO general purpose metric screw threads – Part 3: Nominal sizes for 0,5 mm fine pitch threads; nominal diameter from 3,5 mm to 90 mm: Active: DIN 13-4
Planks are often used as a work surface on elevated scaffolding, and need to be thick enough to provide strength without breaking when walked on. The wood is categorized as a board if its width is less than 2 + 1 ⁄ 2 in (64 mm), and its thickness is less than 1 + 1 ⁄ 2 in (38 mm).
A gallows (or less precisely scaffold) is a frame or elevated beam, typically wooden, from which objects can be suspended or "weighed". Gallows were thus widely used to suspend public weighing scales for large and heavy objects such as sacks of grain or minerals, usually positioned in markets or toll gates.
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