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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. Compressed air enters an airbag shaped like a torus,〔(FAQ ) from company that manufactures air casters, describing their operation.〕 and when the bag is filled it creates an airtight seal with the ground, and forces more air into the center of torus, eventually causing the air to flow over the bag and to raise the load above the ground.
The compressed air is forced under the airbag, pushing it and the load less than a millimeter off the ground.〔(FAQ ) from company that manufactures air bearings, a component of the air caster, describing their operation.〕
==Advantages==
Because air casters are virtually friction-free, the force required to move them is very low, often around one to five lbs. per 1,000 lbs. of weight. Air casters are also omni-directional, meaning they move with equal ease in any direction.〔http://www.airfloat.com/〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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