North Carolina Locksmith Practice Exam

What is a lazy cam or tailpiece designed to do?

1. Remain stationary while the cylinder rotates

2. Automatically engage with a latch

3. Manipulate tumbler mechanisms

4. Secure a door in a mortise lockset

The correct answer is: Remain stationary while the cylinder rotates

The function of a lazy cam, or tailpiece, is to remain stationary while the cylinder of the lock rotates. This design allows the lazy cam to engage with the lock mechanism without itself undergoing movement. When the key is turned, the cylinder rotates and the connected lazy cam aligns with the internal components of the lock, such as the bolt or latch, to facilitate the locking and unlocking process. Understanding this mechanism is crucial as it distinguishes the lazy cam from other parts that may actively participate in the locking action. For instance, options that suggest automatic engagement with a latch or manipulating tumbler mechanisms misrepresent the stationary role of the lazy cam. Its specific function ensures the lock operates smoothly while providing the necessary connection point for interaction between the cylinder and other locking components.