N=4 Reuleaux concept Square Wheel
Gibbon Brachiation Wheel. ----- i.e. continuous brachiation switching system.
cf. ブランコ /blanko/ (In Japanese, we say "blanko" as a swing seat ) [Where that name came from into Japan?]
cf. N=3 original wheel: N=3 2R-Virtual Wheel (Reuleaux triangle-Omusubi)
■ Straight bar is better than hinge. on 2016/09/29
Switching the brachiation branch (MAD⇔MAB⇔MBC⇔MCD⇔MAD... endless loop).
■ Bonus --- other square wheel sample
Cassini Wheel (N=4 4R Virtual Wheel) ------- This tire is more flat ※. and, wheel is not rigid body.
[※ Reuleaux concept case is r=2R curve.]