How do Door Chain and Door Guard Work?

 A comprehensive guide to how door chains and door guards work

Security is a primary concern for any residential or commercial building. To enhance these aspects, door chains and door guards serve as effective complementary devices for doors. They are relatively simple in design, but play an important role in preventing unauthorised access and increasing peace of mind. Here's a detailed overview of how door chains and door guards work, their installation, applications, benefits and differences.

What is a door chain?

A door chain consists of a metal chain and two key components

▪ Chain Holder – Fixed to the door frame.

▪ Chain Slider – Attached to the door.

The chain restricts the movement of the door, allowing it to be only partially opened for communication or inspection while preventing unauthorised access.

How door chains work?

1.Installation

▪ Chain holders are screwed into the door frame, usually at eye level, for convenience.

▪ The slider is attached to the door, aligned with the bracket.

2.Operation

▪ When not in use, the chain hangs freely.

▪ To secure the door, the chain is inserted into the slider, creating a connection between the door and the frame.

3.Restriction of opening

*The chain limits how far the door can be opened, usually by a gap of a few inches.

*This gap allows occupants to visually identify visitors, communicate, or receive small items (such as documents or deliveries) without fully opening the door.

4.Security Enhancement.

If an intruder attempts to force entry, the chain prevents the door from being pushed open unless the chain is broken or unlocked.

What is a door guard?

A door guard is also a secondary door security device, but features an articulated metal bar and a hook. It is also known as a swing bar lock or security latch.

How Door Guards Work?

1.Installation

▪ The swing bar is mounted on the door, near the door edge.

▪ The catch is mounted on the door frame, aligned to fit the bar.

2.Operation

▪ The hinged bar swings into place and locks onto the latch on the door frame.

▪ When locked, the door can be opened slightly to allow interaction with visitors, but it cannot be opened further without disengaging the guard.

3.Durability and Strength

▪ Door guards are usually stronger than chains due to their sturdy metal construction.

▪ They can withstand greater force and are not easily damaged or tampered with.

 Applications for door chains and door guards

Both devices are versatile and can be used in a variety of settings, including:

1.Residential

Apartments, houses and condominiums use these devices to enhance the security of front doors.

2.Hotels and Hospitality

Many hotel rooms are equipped with door guards to provide extra protection for guests.

3.Commercial Application

Small offices or shops use these devices to control access during business hours.

4.Elderly or Assisted Living Homes

They provide security while allowing residents to safely interact with visitors or caregivers.

 Advantages of door chains and door guards

Door Chain

1.Easy to Install

Requires basic tools and minimal time.

2.Affordable

Cost-effective solution with added security.

3.Simple design

Easy to use, even for individuals with limited mobility or technical knowledge.

Door Guard

1.Enhanced Durability

Withstands greater forces than chains.

2.Improved Aesthetics

Often have stylish designs and finishes to complement modern interiors.

3.Resistance to Trouble

More resistant to being forcibly removed or cut.

Restrictions

Door Chain

1.Limited Force

Can be broken with enough force.

2.Potential Deviations

Over time, frequent use may cause components to become misaligned, which can affect functionality.

Door Guard

1.Slightly more complex installation:

Requires precise alignment of rods and capturing correctly.

2.Restricted use on certain doors:

Not suitable for very thin doors or those with unusual designs.

 Differences Between Door Chains and Door Guards

Feature	Door Chain	Door Guard
Design	Flexible metal chain	Hinged solid metal bar
Security Level	Moderate	Higher
Durability	Can be cut or broken	More robust and resistant
Ease of Installation	Easy	Slightly more effort required
Cost	Typically cheaper	Slightly more expensive
Aesthetics	Basic	Modern and stylish options available

How to choose between door chains and door guards

1.Required level of security

If durability and resistance are priorities, choose a door guard.

2.Ease of use and installation

Door chains are easier to install and operate, making them a good choice for quick fixes.

3.Budget

Door chains are more affordable, but the added benefits of a door guard may justify the cost difference.

4.Door Type

Consider the material, thickness and design of the door. For heavy or reinforced doors, door guards may be more appropriate.

 Step-by-Step Installation Guide

Installing the door chain

1.Tools Required

▪ Screwdriver, tape measure, screws.

2.Process

▪ Mark the desired location of the chain holder and slider.

▪ Drill pilot holes if necessary.

▪ Secure the bracket to the frame with screws and attach the slider to the door.

▪ Test the chain to make sure it runs smoothly and is centred.

Installing the door guard

1.Tools required

▪ Drill, screwdriver, screws, level.

2.Process

▪ With the door closed, align the bar and handrail to ensure a proper fit.

▪ Secure the latch to the door with screws to secure the latch to the door frame.

▪ Swing the lever into the capture and test setting to verify it works as expected.

Maintenance Tips

1.Periodic Inspection

Check for wear or misalignment.

2.Lubrication

Use a small amount of lubricant on moving parts to ensure smooth operation.

3.Tighten Screws

Periodically check and tighten loose screws.

4.Replace damaged parts

If the chain or guard shows signs of damage, replace them promptly to ensure safety.

Both door chains and door guards are practical solutions for enhancing door security. Door chains offer simplicity and affordability, while door guards offer greater durability and strength. Choosing the right device depends on your specific needs, including the level of security required, the type of door and your budget.

By understanding how these devices work and installing and maintaining them correctly, you can significantly improve the security and functionality of your doors, ensuring peace of mind in both residential and commercial spaces.

Contact us Now:

Contact: David Jian
Mob:0086-139 2903 7292
Email: David@dndhardware.com, sales@dndhardware.com,

Jobby Zhang
Mob:0086-137 2599 9617

Email: jobby@dndhardware.com