The Quickstop Chain Brake can be activated by inertia under what condition?

• A. Manual activation must be used
• B. The chain is cooled to operating temperature
• C. Kickback force is sufficient to trigger inertia activation
• D. The bar is removed

Answer: (C)

Inertia-activated chain brakes respond to a sudden, unexpected motion of the bar, typically from kickback. When the kickback force is strong enough, the inertial mechanism moves a weight that pivots and pulls the brake into place, stopping the chain. That’s why this condition is the best answer: kickback force is sufficient to trigger inertia activation. Manual activation is a separate method you can use by hand, while cooling the chain or removing the bar don’t cause the inertial mechanism to engage.