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40 Inventive Principles
Spheroidality

a) Replace linear parts or flat surfaces with curved ones. Replace cubic shapes with spherical ones.

b) Use rollers, balls or spirals.

c) Replace a linear motion with rotary movement. Use centrifugal forces.
 

EXAMPLE:
  1. A welding device for welding pipes onto the walls of a boiler uses ball or roller-shaped electrodes.
  2. A space saving conveyor belt is in the form of a carousel.
  3. To allow a vehicle to move in all directions, it’s put on rollers instead of wheels.
  4. A computer mouse uses a ball to convert two-dimensional motion on a mouse pad into the cursor movement on the computer screen. Details