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It is mandatory to procure user consent prior to running these cookies on your website. Sign in. Forgot your password? In this guide, I'll break down and discuss the purpose of each part of a doorknob and how it all functions together to make the lock work.
Throughout this guide, we'll be dissecting a door lock that includes a pin tumbler locking mechanism—such as those found on your front door. The common door lock will have two knobs or handles—one on the inside of the door and one on the outside. The inside knob or handle typically includes a thumb turn that allows you to engage the locking mechanism with your fingers.
Meanwhile, the outside knob or handle typically features a lock cylinder that requires a key to engage and disengage the locking mechanism. Doorknobs and handles can contain a variety of different locking devices. The most common type of lock found on exterior doors is pin tumbler cylinders that use a traditional house key to lock and unlock. 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.
First, it conceals and secures the internal mechanism of the doorknob. Second, it acts as a decorative element to make your door look pretty. The interior rose goes on the inside of the door and typically gives you access to the mounting screws that hold the lock to the door. Meanwhile, the exterior rose goes on the outside of the door and is free of any components that can be disassembled or manipulated.
Additionally, some door locks utilize a mounting plate to hold the doorknob together and use a "concealed rose" that covers the screws completely. It works by using a series of pins to restrict an inner cylinder from rotating. However, when the correct key is inserted into the lock, the pins are push out of the way, and the inner cylinder is allowed to rotate and unlock the lock.
We'll dive a little deeper into the components of a pin tumbler lock cylinder further down the guide. In addition to the lock cylinder, there are many doorknobs that use privacy locks, such as those found on a bathroom door.
Some doorknobs don't have a lock at all. The spindle is a square bar that connects both knobs and passes through the center of the doorknob. When the knob is twisted, or the handle is pushed down, the spindle rotates and retracts the spring bolt, allowing the door to open.
This spring bolt—or latch bolt—utilizes a "spring clip" to force the bolt outward and into a hole in the doorframe. This holds the door closed. They rely on a series of magnets and small, electric-powered motors that are activated to open and close. Electronic locks are programmed to require the correct keypad combination , key fob , access card or biometric data , such as fingerprints, in order to unlock.
Smart Electronic Locks are electronic locks with the added capability of being controlled remotely through a smartphone application. A business owner can monitor traffic, restrict access through certain doors, lock doors and activate the security system without being anywhere near the building. Usually, smart electronic locks also have a mechanical key cylinder to allow access with a traditional key. An experienced locksmith should also be able to answer any questions you have.
Call us at or fill out our online request form to get in touch with Great Valley Lockshop. This blog was originally published on June 10, and has since been modified and updated to reflect the most accurate information.
The strike plate of a deadlatch is sized only to accommodate the main bolt and not the deadlatch bolt. Thus, when the door is closed, the deadlatch bolt is retracted. A retracted deadlatch bolt has a mechanism that prevents the main bolt from being pushed or retracted.
These types of door latches offer the highest level of security. They function the same way as deadbolts. The only difference is both sides of the door need a key for unlocking the latch. The inside still has a knob but is only used for extending the bolt. Deadlocks are great for providing increased security but pose the danger of potentially trapping crowds during an emergency since a key is needed on either way. Other types of door latches are simple sliding bolts and hooks. They are used on doors that do not get much traffic.
They can be made stronger than door knobs since their bolts and latching mechanisms can be made thicker and more robust. These types of door latches are usually accessible only on one side of the door. A simple latch is composed of a base, a bolt, and a box or hole. The base which contains the bolt is typically installed on the door. The box, on the other hand, is installed on the frame. Sliding or moving the bolt into the box activates the latch such that one end of the bolt holds the door while the other holds the frame.
This basic design is further modified which brought forth different types of latches. The most distinct types are discussed below. Bolt latches or latch bolts are simple latching mechanisms that consist of a bolt, a handle, a backplate, a set of barrels, and a box called a striker. The barrels hold the bolt in place and provide locking for the latch. They are formed into a non-continuous loop which allows the handle to pass through. A bolt latch can be locked or unlocked by sliding the bolt into the socket.
The most common type of latch bolt is a barrel bolt. They are used for closing gates, doors, and windows. A spring latch is similar to a bolt latch but is equipped with a spring for automatic bolt extension.
Some designs use the spring to keep the bolt retracted. Spring latches can have different constructions. A simple spring latch has an L-shaped bolt called a plunger that has a small hole for inserting a clip or pin. Its backplate is formed with two holed lips for holding the plunger. To keep the plunger in an extended position, a spring is fitted between the lip and pin. The design of a spring latch is also seen on deadlatches and slam latches. Deadlatch and slam latches have their unique features which differ them from ordinary spring latches.
Slam latches are also known as push-to-close latches. They are used for doors that require automatic latching when closed. Their design uses cams instead of bolts for latching onto the striker or door frame. They have a rounded or chamfered edge to allow retraction upon impact onto the striker. A spring-loaded mechanism is used to keep the cam raised. When actuated, the cam moves either by turning or sliding.
A slam latch is more robust in construction when compared to an ordinary spring latch. They can resist more opening and closing cycles without developing damage to their parts. Slam latches are mostly used in high traffic doors seen in commercial and industrial areas. Emergency exits also feature a slam latch that can easily be released by pushing the handle. Swinging latches, or swinging door latches, are similar to slam latches. They are push-to-close latches that automatically activate when the door is shut.
They feature a spring-loaded mechanism that keeps the bolt in the extended position. The edge of the bolt that impacts the striker is rounded to allow retraction. Cam latches are commonly used in furniture such as drawers and cabinets. These types of latches work by turning a knob or key which also rotates an arm fitted on the other side of the door.
Like other knob-activated latches, they are quarter-turn devices. Their assembly does not include a strike plate, box, or hole installed on the frame for receiving the arm. They lock the door or enclosure by barring only one side. Thus, they are not suitable for doors that swing or move past the frame.
Aside from hinges, handles, and guide rails, furniture such as cabinets and drawers always has a latch installed. Cabinets latches can be of various forms.
The most popular are bolt, spring, cam, and slam latches. Cabinet latches are usually made from stainless steel, brass, copper, and dyed anodized aluminum.
These materials give better aesthetic quality while being durable and resistant to corrosion. Different metalworking processes such as casting, cutting, and forging are done to produce cabinet latches.
As a decorative product, cabinet latch dies and molds are prepared with patterns and shapes much more complex than ordinary latches. As the name suggests, gate latches are used for securing gates and large doors. They are made much stronger and thicker than cabinet latches. One thing in common with cabinet latches is that they can also be made with architectural design features. Common gate latch forms are barrel bolts, bars, and heavy-duty industrial latches.
In some instances, slam and spring latches are also used. They are made with thicker gauge sheets or plate metal and are formed by larger compression forces. Gate latches are usually made with galvanized steel and stainless steel, particularly grade These materials are suitable for the high strength and corrosion resistance required by their application.
Gate latches are seen in every industry, may it be industrial, commercial, or residential. This type of latch is similar to a cam latch.
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