Locksmith Lock Mechanisms 4

Question 1

A 'deadbolt' lock mechanism differs from a 'spring latch' mechanism primarily because:

Accepted Answer

A deadbolt requires deliberate key or thumb-turn actuation and does not retract under pressure

Answer

A deadbolt has a square-ended bolt that must be manually actuated by a key or thumb-turn and cannot be pushed back by pressure, unlike a beveled spring latch that retracts automatically.

Question 2

In a double-cylinder deadbolt, what is a major safety consideration?

Accepted Answer

It requires a key to operate from both sides, which can impede emergency egress

Answer

Double-cylinder deadbolts require a key on both sides, meaning occupants cannot quickly exit in an emergency if the key is not immediately accessible, which is a fire safety concern.

Question 3

What is the role of the 'cam' in a cylinder lock?

Accepted Answer

It translates the rotational movement of the plug into the linear or rotational motion needed to operate the lock mechanism

Answer

The cam is attached to the back of the plug and converts the plug's rotation into the motion required to retract a bolt, operate a latch, or drive another mechanism.

Question 4

Which type of lock mechanism uses a rotating curtain to block the keyway when no key is inserted?

Accepted Answer

High-security cylinder with anti-pick curtain

Answer

Some high-security cylinders incorporate a rotating curtain (or slider) in the keyway that blocks picking tools and must be pushed aside by the correct key profile before tumblers can be accessed.

Question 5

A 'knob lock' mechanism is considered less secure than a deadbolt primarily because:

Accepted Answer

The locking mechanism is housed in the knob itself and can be defeated by forcibly breaking or wrapping the knob

Answer

Knob locks have the cylinder and mechanism inside the knob, making them vulnerable to being snapped or gripped with channel-lock pliers to expose the spindle and retract the latch.

Locksmith Practice Test

Locksmith Practice Test

Locksmith Lock Mechanisms 4