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2. Caster - Wikipedia

   en.wikipedia.org/wiki/Caster

   The diameter of a caster wheel affects how easily the caster moves over particulate, rough or irregular surfaces. Large diameter caster wheels are able to bridge gaps like that between the floor and an elevator car. However, the larger the diameter of a caster wheel, the higher the caster support arm must be.

3. Differential pulley - Wikipedia

   en.wikipedia.org/wiki/Differential_pulley

   [2] A dumb pulley can lift very large masses a short distance. It consists of two fixed pulleys of unequal radii that are attached to each other and rotate together, a single pulley bearing the load, and an endless rope looped around the pulleys. To avoid slippage, the rope is usually replaced by a chain, and the connected pulleys by sprockets.

4. Pulley - Wikipedia

   en.wikipedia.org/wiki/Pulley

   A pulley is a wheel on an axle or shaft enabling a taut cable or belt passing over the wheel to move and change direction, or transfer power between itself and a shaft. A sheave or pulley wheel is a pulley using an axle supported by a frame or shell ( block ) to guide a cable or exert force.

5. Roller coaster wheel assembly - Wikipedia

   en.wikipedia.org/wiki/Roller_coaster_wheel_assembly

   They often consist of at least 3 wheels per assembly, but can contain more. The typical arrangement of the wheels are: Running wheels (also known as road wheels or tractor wheels): positioned on the top of the rail, bearing the weight of the train. Side friction wheels: positioned on a horizontal plane, either inside or outside of the rails ...

6. Conveyor pulley - Wikipedia

   en.wikipedia.org/wiki/Conveyor_pulley

   A conveyor pulley is a mechanical device used to change the direction of the belt in a conveyor system, to drive the belt, and to tension the belt. Modern pulleys are ...

7. Caster angle - Wikipedia

   en.wikipedia.org/wiki/Caster_angle

   Caster displacement moves the steering axis ahead of the axis of wheel rotation, as with the front wheels of a shopping cart. Caster angle moves the steering axis from vertical. [3] In automobile racing, the caster angle may be adjusted to optimize handling characteristics for a particular venue. This is all connected to the front wheels.