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  2. Caster - Wikipedia

    en.wikipedia.org/wiki/Caster

    Industrial casters are heavy duty casters that are designed to carry heavy loads, in some cases up to thirty thousand pounds. An Industrial caster may have either a swivel or rigid caster design. Industrial casters typically have a flat top plate that has four bolt holes to ensure a sturdy connection between the top plate and the load.

  3. Scaffolding - Wikipedia

    en.wikipedia.org/wiki/Scaffolding

    Scaffolding for rehabilitation in Madrid, Spain [1] Scaffolding for renovation on the Virgin Mary statue, Santiago de Chile, Chile.. Scaffolding, also called scaffold or staging, [2] is a temporary structure used to support a work crew and materials to aid in the construction, maintenance and repair of buildings, bridges and all other human-made structures.

  4. Caster angle - Wikipedia

    en.wikipedia.org/wiki/Caster_angle

    Caster angle and trail both influence the steering, albeit in different ways: caster tends to add damping, while trail adds "feel" and returnability. The caster wheel on shopping carts are an extreme case – the system is undamped but stable, as the wheel oscillates around the "correct" path. The construction has relatively high trail, but no ...

  5. Wheel - Wikipedia

    en.wikipedia.org/wiki/Wheel

    An early wheel made of a solid piece of wood. A wheel is a rotating component (typically circular in shape) that is intended to turn on an axle bearing. The wheel is one of the key components of the wheel and axle which is one of the six simple machines. Wheels, in conjunction with axles, allow heavy objects to be moved easily facilitating ...

  6. Air caster - Wikipedia

    en.wikipedia.org/wiki/Air_caster

    An air caster is a pneumatic lifting device used to move heavy loads on flat, non-porous surfaces. Its operation is similar to a hovercraft , as it uses a thin layer of air as a way to float a very small distance off the ground.

  7. Gallows - Wikipedia

    en.wikipedia.org/wiki/Gallows

    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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