When the door is shut, and the primary spring bolt is pushed into the door frame, the deadlatch will remain held in by the doorframe. The deadlatch is a spring-loaded secondary bolt that sits behind the primary and larger spring bolt. That being said, many doorknobs have a secondary locking mechanism built into the latch assembly called the "deadlatch" or "deadlocking plunger." This is why exterior doors should at minimum use a deadbolt as a primary security measure. Additionally, the lock cylinder only keeps the handles from turning and not the bolt from retracting.Īs a result, these locks are vulnerable to slip and shimming attacks, such as bypassing a lock with a credit card. However, this slant makes the doorknob vulnerable-even when locked. They can also utilize low-security privacy locks, such as those on bathroom and bedroom doors, that can be unlocked in emergencies with small tools like a screwdriver or a paperclip.Īdditionally, some doorknobs contain no locking mechanism and function only as a doorknob.įor convenience, the end of the bolt is slanted on one side, which allows you to push the door closed without manually turning the handle to retract the bolt. The most common type of lock found on exterior doors is pin tumbler cylinders that use a traditional house key to lock and unlock. Meanwhile, the outside knob or handle typically features a lock cylinder that requires a key to engage and disengage the locking mechanism.ĭoorknobs and handles can contain a variety of different locking devices. The inside knob or handle typically includes a thumb turn that allows you to engage the locking mechanism with your fingers. The common door lock will have two knobs or handles-one on the inside of the door and one on the outside. Let's cover the anatomy of a door lock and its terminology in detail. Most doorknobs consist of 6 main components.
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