One-way inertial rotational device

A one-way inertial rotational device comprising:

• a rotary seat having a circumference, the rotary seat being drivable;
• an inertial member having a pivot hole, the inertial member being pivotally disposed on the circumference of the rotary seat via the pivot hole, whereby the inertial member is rotatable around the rotary seat;
• the circumference of the rotary seat and a hole wall of the pivot hole of the inertial member being defined as a first circumferential face and a second circumferential face corresponding to each other;
• a one-way transmission mechanism having at least one one-way transmission tooth, at least one elastic member and multiple engagement teeth, the engagement teeth being annularly disposed on the second circumferential face at equal intervals, the transmission tooth being disposed on the first circumferential face and displaceable to engage with or disengage from the engagement teeth, the elastic member being disposed on the first circumferential face to apply elastic energy to the transmission tooth for making the transmission tooth move toward the engagement teeth, whereby when the rotary seat is rotated in a direction, via the transmission tooth, the rotary seat drives the inertial member to rotate and when the rotary seat is rotated in another direction, the transmission tooth skips and slides over the engagement teeth;
• and
• each engagement tooth having a tooth crest and a tooth height, a width of each tooth crest being larger than each corresponding tooth height.