Oscillation engine of flat coil spring
Bring the gray flywheel out of its neutral position and let it oscillate freely.
The oscillation of the flywheel is caused by a flat coil spring of two spiral directions. One end of the spring is fixed to the stationary shaft (in blue). The other end is fixed to the axle of the crank (in gray). The latter and the flywheel are fixed together.
The mechanism works like a pendulum, but the oscillating angle can be very large (more than 1 revolution).
Please let me know if anyone has seen this engine in practice?