Table of Contents
How does a door knob work?
A standard doorknob lock set consists of a pair of knobs, one on each side of the door, that are connected through the door by a spindle and held together by mounting bolts. When either knob turns, it rotates the spindle, and the spindle retracts the latch and allows the door to open.
What are the parts to a door knob?
Parts of a Door Lock Knobs and Handles. The common door lock will have two knobs or handles—one on the inside of the door and one on the outside. Rosette. The rose or rosette is typically a round plate that serves two functions. Lock Cylinder. Spindle. Latch Assembly and Spring Bolt. Deadlocking Plunger. Strike Plate.
What is the plate behind a door knob called?
Trim: Sometimes called a rose, the trim is a decorative plate attached to the door under the knob or lever.
Why do door latches have two parts?
The main latch is supposed to fall into the strike hole on the door frame, the little part is supposed to sit on the surface of the strike (not fall into the hole). This feature is meant to keep someone from retracting the latch from the outside of the door with a credit card or other device.
Do door knobs come with strike plates?
Yes, it comes with strike plate and screws.
How does a lock cylinder work?
In the cylinder lock, the key turns a cylinder, or plug, which turns an attached cam. When the plug is turned one way, the cam pulls in on the bolt and the door can open. When the plug turns the other way, the cam releases the bolt and the spring snaps it into place so the door cannot open.
Why does my door knob keep falling off?
There are several reasons why a doorknob becomes loose and falls off. For instance, there may be a missing or loose screw on the door plate. Additionally, there may be dirt or other obstructions that hinder its useability, making it loose and fall off.
Why does my door handle keep coming loose?
The problem is that the set screw loosened up and is not applying enough pressure against the threaded spindle. This happens as doorknobs age from use. Screws loosen, and doorknobs go wonky. Newer style doorknobs may not have set screws but can still loosen.
What are door catches?
The door catch is a fitting to keep a closed door at a normal position and not to naturally open due to a wind pressure.
What is a door latch set?
The latch is the mechanism that slides into the enge of the door and retracts or protrudes with the turn of the door knob. The latch keeps the door closed and when the knob is turned allows the door to open.
What is a door plunger?
“Deadlocking plunger” (also called “deadlatch plunger” or “deadlock plunger”) is the name of a very important piece of a door lock assembly; it keeps a locked door from being opened with a small screwdriver or credit card.
What is a dead latch?
What is a deadbolt? It’s a lock you need to use a key with to lock and unlock. Generally deadbolts are installed on doors that already have a doorknob set. The deadbolt adds extra security to the door, essentially a double locked door when no one is home.
What does deadlocking latch bolt mean?
A deadlock is a type of lock that when in deadlock mode can only be unlocked with a key. When not in the deadlock mode you are able to use the handle to unlock and open the door from the inside. This type of locking mechanism is popular in both commercial and residential properties to provide high levels of security.
What is a dummy lock?
A dummy lock refers to a “fake” lock that has the appearance of a normal padlock. It can be attached to a shed, or a trailer, or anything else that you’d normally be able to lock with a normal padlock. A dummy lock doesn’t need a key to unlock it.
Do dummy door knobs latch?
Dummy knobs don’t have latches, so they can be installed anywhere on your door.
Should hinges and door knobs match?
Should hinges match door knobs? And there’s no hard and fast rule when choosing, generally if your hinges are exposed they should match your handles and knobs finishes. You can easily hold the hinges and knobs or handles against the finish of your doors and cabinets to see which colours and styles go best together.
What does a cylinder lock look like?
A cylinder lock is literally in the shape of a cylinder, with no locking bar. The cylindrical lock fits in an elongated hole on the left side of the latch plate. This opening should have a slightly arched top and a flat bottom, that corresponds to the arched top and flat bottom on the shaft of the cylinder lock.
What is the difference between single cylinder and double cylinder door locks?
While the single-cylinder deadbolt only features a locking mechanism requiring a key on one side, the double-cylinder deadbolt has it on both. This means that a key will be required to turn the lock both on the inside of the door and the outside. This is the main difference between these two types of deadbolts.
How does lock and key work?
When a key is inserted into the lock they press against the pin tumblers forcing them into the upper chamber pins and compressing the springs. The cam which rotates to catch the bolt of the lock is triggered once the key has rotated the barrel. This rotation allows the lock to either unlock or lock.
