Centrifugal engagement and disengagement drive systems

A drive system, comprising:

• a first clutch member coupled to a shaft;
• a second clutch member operatively adjacent to the first clutch member, the second clutch member configured to:
• couple to the first clutch member in response to the rotational speed of the shaft equaling or falling below a first threshold rotational speed, and
• de-couple from the first clutch member in response to the rotational speed of the shaft exceeding the first threshold rotational speed;
• and
• a third clutch member configured to:
• couple to the second clutch member in response to the rotational speed of the shaft exceeding the first rotational speed.

A drive system, comprising:

• a first clutch plate coupled to a shaft;
• a second clutch plate including a first surface indexed to couple with a surface of the first clutch plate, the first clutch plate surface and the second clutch plate first surface including race wall surfaces configured to form a first race between the first and second clutch plates, the first race extending radially outward from the shaft toward circumferential edges of the first and second clutch plates;
• a first weight disposed in the first race;
• a third clutch plate coupled to a drive output member, the second clutch plate including a second clutch plate surface configured to:
• couple with a first surface of the third clutch plate in response to a radially outward movement of the first weight in the first race, and
• de-couple from the first surface of the third clutch plate in response to a radially inward movement of the weight in the first race.