How does a pull-back car work? Illustrated teardown

9 hours ago

Pull-back cars use a clockwork mechanism to store energy in a spiral spring and release it to propel the car forward.
The wind-up mechanism was invented in 1970 by Darda, replacing earlier toys that required manual winding with a key.
Inside the car, a spiral spring is wound by two spring gears rotating in opposite directions to store energy.
Gears are crucial for multiplying torque to make winding easier for kids and increasing speed for the car's movement.
The gear train includes six unique gears that operate independently in drive mode but connect as one system in wind mode when the car is pressed down.
The winding mechanism has a limit to prevent infinite energy buildup, with notches in the spring gear playing a key role.

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