Spherical body drive type movement device

A spherical body drive type movement device comprising:

• n number of driving spherical bodies each rolling on a traveling surface;
• and
• n or more number of rotary bodies rotating the driving spherical bodies by being rotationally driven in a state of being in contact from two different directions with each of the driving spherical bodies,
• the spherical body drive type movement device moving on the traveling surface,
• wherein when the traveling surface is a horizontal surface, a center of each of the driving spherical bodies is located on one of lateral edges of a virtual inverted n-gonal pyramid having a base face disposed at a position higher than the center of each of the driving spherical bodies and also having a vertex being away from the base face and disposed at a position lower than the center of each of the driving spherical bodies,
• further wherein each of the rotary bodies comes into contact with at least one of the driving spherical bodies at a position or positions higher than the center of the at least one of the driving spherical bodies in contact and inside the virtual inverted n-gonal pyramid, or at a position or positions higher than the center of the at least one of the driving spherical bodies in contact and when lateral faces of the virtual inverted n-gonal pyramid each including as a part of an outer edge thereof two of the lateral edges on each of which the center of one of the driving spherical bodies is disposed are defined as corresponding lateral faces, on one of the corresponding lateral faces, and besides, each of the rotary bodies is rotationally driven about a rotary shaft perpendicular to the one of the corresponding lateral faces;
• provided, however, that n is an integer of three or more,
• wherein each of the lateral faces, a part of the outer edge of which is composed of two of the lateral edges on which the centers of two of the driving spherical bodies are respectively disposed, of the virtual inverted n-gonal pyramid is parallel to a virtual straight line K passing through a contact point at which one of the rotary bodies placed between the two of the driving spherical bodies comes into contact with one of the two driving spherical bodies, and also through another contact point at which the one of the rotary bodies comes into contact with the other one of the two driving spherical bodies.