Centrifugally-activated brake system for a wheeled device

A centrifugally activated brake system for a wheeled device capable of engagement without manual intervention, comprising:

• a wheel comprising
• a hub,
• a rim,
• spokes extending between the hub and the rim,
• a rod extending between the hub and the rim,
• a helical spring surrounding the rod and having a fixed end attached to the hub and a free end capable of moving along a longitudinal direction of the rod, and
• a brake mass structure attached to the free end of the helical spring, being capable of moving along the longitudinal direction of the rod and comprising a cylindrical pin structure;
• a main frame connected to the hub of the wheel, wherein the brake mass structure comprises a plate having a through-hole formed therein, and wherein the rod extends through the through-hole so that the brake mass structure is capable of moving along the longitudinal direction of the rod;
• and
• an extension structure comprising
• a spacing segment that extends from the main frame, and
• a hook segment spaced apart from the hub by the spacing segment and having a groove formed therein which is configured to engage with the cylindrical pin structure of the brake mass structure, wherein the groove of the hook segment is semi-circular and capable of accommodating the cylindrical pin structure;
• wherein when the wheel rotates, the brake mass structure is configured to move away from the hub along the longitudinal direction of the rod,
• wherein when the wheel rotates at or above a speed threshold, the brake mass structure is configured to move away from the hub along the longitudinal direction of the rod so that the cylindrical pin structure of the brake mass structure engages with the groove of the hook segment of the extension structure to stop the wheel from accelerating.