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2. Guard stone - Wikipedia

   en.wikipedia.org/wiki/Guard_stone

   Obsolete cannons were often used as wheel guards in the Netherlands, such as for the Catherine's gate in Dordrecht. A guard stone, jostle stone or chasse-roue (French lit. "wheel chaser"), is a projecting metal, concrete, or stone exterior architectural element located at the corner and/or foot of gates, portes-cochères, garage entries, and walls to prevent damage from vehicle tires and wheels.

3. 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.

4. Rolling resistance - Wikipedia

   en.wikipedia.org/wiki/Rolling_resistance

   Rolling resistance, sometimes called rolling friction or rolling drag, is the force resisting the motion when a body (such as a ball, tire, or wheel) rolls on a surface. It is mainly caused by non-elastic effects; that is, not all the energy needed for deformation (or movement) of the wheel, roadbed, etc., is recovered when the pressure is removed.

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. Tapered roller bearing - Wikipedia

   en.wikipedia.org/wiki/Tapered_roller_bearing

   Tapered roller bearings are commonly used for moderate speed, heavy duty applications where durability is required. Common real world applications are in agriculture, construction and mining equipment, sports robot combat , axle systems, gear box, engine motors and reducers, propeller shaft, railroad axle-box, differential, wind turbines, etc.

7. Electric gate - Wikipedia

   en.wikipedia.org/wiki/Electric_gate

   An electric gate is a ... type that retracks a gate along the fence or wall on wheels or bearing, or the swing type that draws the gate open or closed on hinges ...