Which term describes the mechanism used to activate a double lock on handcuffs?

Which term describes the mechanism used to activate a double lock on handcuffs?

• A. Lock housing mechanism
• B. Push-pin double lock
• C. Single strand teeth
• D. Key actuator

Answer: (B)

The key idea is that a double lock is a safety feature that prevents the cuffs from tightening further. Activating it uses a push-pin mechanism. When you push the small pin on the outside of the cuff (often with the tip of the handcuff key or a tiny tool), it shifts a second locking component into place. This locks the pawl so the ratchet cannot move, even if you try to tighten the cuffs further. That’s why this method is described as a push-pin double lock—it’s specifically the pinward push that engages the secondary lock. Other terms don’t describe this activation method: the lock housing is the overall housing that contains the locking parts, the single strand teeth refer to the ratchet teeth that allow tightening, and the key actuator is about unlocking with the key, not about engaging the double lock.

The key idea is that a double lock is a safety feature that prevents the cuffs from tightening further. Activating it uses a push-pin mechanism. When you push the small pin on the outside of the cuff (often with the tip of the handcuff key or a tiny tool), it shifts a second locking component into place. This locks the pawl so the ratchet cannot move, even if you try to tighten the cuffs further. That’s why this method is described as a push-pin double lock—it’s specifically the pinward push that engages the secondary lock.

Other terms don’t describe this activation method: the lock housing is the overall housing that contains the locking parts, the single strand teeth refer to the ratchet teeth that allow tightening, and the key actuator is about unlocking with the key, not about engaging the double lock.