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  2. Roller dam - Wikipedia

    en.wikipedia.org/wiki/Roller_dam

    The purpose of the rolling is to dissipate the energy gained by the water as it falls from the top of the dam. Otherwise the energy would be exerted downstream, causing significant bank and river bed erosion. Roller dams can be either fixed (non-moving) or active. Fixed roller dams are generally made from reinforced concrete or masonry.

  3. Bed frame - Wikipedia

    en.wikipedia.org/wiki/Bed_frame

    Hospital bed frames. A bed frame [1] or bedstead [2] is the part of a bed used to position the bed base, the flat part which in turn directly supports the mattress(es). The frame may also stop the mattress from sliding sideways, and it may include means of supporting a canopy above. There are several types of Bed Frames [3] found around

  4. Rollover protection structure - Wikipedia

    en.wikipedia.org/wiki/Rollover_protection_structure

    Some tractor operators have raised concerns about using ROPS in low-clearance environments, such as in orchards and buildings. In response, NIOSH developed an Automatically Deploying Rollover Protective Structure (AutoROPS) which stays in a lowered position until a rollover condition is determined, at which time it deploys to a fully extended and locked position.

  5. Walker (mobility) - Wikipedia

    en.wikipedia.org/wiki/Walker_(mobility)

    Walking frames have two front wheels, and there are also wheeled walkers available having three or four wheels, also known as rollators. Walkers started appearing in the early 1950s. The first US patent was awarded in 1953 to William Cribbes Robb, of Stretford, UK, for a device called "walking aid", which had been filed with the British patent ...

  6. Structural shape rolling - Wikipedia

    en.wikipedia.org/wiki/Structural_shape_rolling

    Cross-sections of continuously rolled structural shapes, showing the change induced by each rolling mill. Structural shape rolling, also known as shape rolling and profile rolling, [1] is the rolling and roll forming of structural shapes by passing them through a rolling mill to bend or deform the workpiece to a desired shape while maintaining a constant cross-section.

  7. Road roller - Wikipedia

    en.wikipedia.org/wiki/Road_roller

    Caterpillar soil compactor equipped with padfoot drum, being used to compact the ground before placing concrete Antique "Kemna" steamroller. A road roller (sometimes called a roller-compactor, or just roller [1]) is a compactor-type engineering vehicle used to compact soil, gravel, concrete, or asphalt in the construction of roads and foundations. [1]

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