Double joint hinge

Types of double joint hinge

A double joint hinge is also known as a double knuckle hinge. It connects two doors or windows to a frame and allows them to open and close smoothly. This type of hinge has two sets of leaves and two pins that fit into the knuckles of both leaves. The double joint hinge provides stability and support for heavy or wide doors. It distributes weight evenly across the joints, reducing stress on a single joint hinge. The double joint hinge is commonly used in cabinets, gates, and other applications where strength and flexibility are required.

Below are some common types of double joint hinges:

• Double action hinge:

  This hinge allows the door to swing open and closed in both directions. It is commonly used in high-traffic areas such as restaurant kitchen doors, swing doors, and some bathroom stall doors. Double-action hinges provide seamless entry and exit without manually pushing the door.

• Piano hinge:

  This continuous hinge runs the entire length of the door or lid. It provides uniform support along the entire edge, making it ideal for applications such as piano hoods, storage chest lids, and heavy-duty doors. Piano hinges are known for their strength and stability.

• Bi-fold hinge:

  These hinges are used in folding doors or panels, allowing multiple sections to fold together. They are commonly used in closet doors, room dividers, and space-saving door solutions. Bi-fold hinges are designed to provide smooth and effortless folding and unfolding actions.

• Pivot hinge:

  Pivot hinges are placed at the top and bottom of the door rather than on the side. They allow the door to rotate around a pivot point. Pivot hinges are often used for heavy doors, such as in commercial spaces or for large doors in residential settings. They provide a unique aesthetic and smooth operation.

• Double-leaf hinge:

  This type of hinge consists of two sets of leaves that operate simultaneously. It is commonly used for double doors in commercial and historical building entrances. Double-leaf hinges provide a visually appealing and functional solution for heavy and wide doors.

Functions and features of double joint hinge

A double joint hinge has several features, including a third leaf, double articulation, and a flat design. Each feature contributes to the hinge's unique functionality, enabling it to provide specific solutions in different applications.

Functions of a double joint hinge:

• Providing a flexible connection between two parts: double joint hinges connect two sections, allowing them to rotate and move flexibly. They are commonly used for devices that require parts to move in tandem, such as laptop screens and utility doors.
• Enabling multi-directional movement: double jointed hinges allow doors, panels, or other connected parts to move in multiple directions. This capability is ideal for applications that require components to be adjusted or positioned easily, such as in medical imaging equipment and in some types of workstation dividers.
• Adjusting and articulating: the double articulation feature enables the connected parts to raise, lower, or extend. This function is useful in applications requiring precise positioning and angling of components, like in some types of drafting tables and industrial machinery.
• Increasing accessibility: double joint hinges make parts like doors and panels articulate. This articulation allows for easy opening and closing, improving accessibility and convenience. For example, in cabinetry, double jointed cupboard doors open fully to provide easy access to the interior.
• Enhancing design and structural integrity: the third leaf feature provides additional stability and strength to the hinge. This characteristic allows the hinge to support heavier loads and endure more significant stress. This is particularly useful in applications where structural integrity is paramount, such as in bridge construction and heavy machinery.
• Reducing friction and wear: double joint hinges are designed to articulate smoothly. This design reduces internal friction and wear between the moving parts. As a result, they provide durability and longevity, especially in applications requiring frequent or continuous motion, such as in folding partitions and gymnasium bleachers.
• Accommodating misalignment: double joint hinges can compensate for misalignment between the connected sections. This functionality is particularly useful during installation or when dealing with uneven surfaces or angles. For example, in the case of adjustable shelving units, double jointed hinges can compensate for wall imperfections to ensure proper alignment of the shelves.

Scenarios of double joint hinge

Double-hinged doors are used in many different settings. These include:

• Homes: Double-hinged interior doors are often used in homes. They provide a traditional look. They also allow the user to open the door fully into the room or against the wall. Double-hinged closet doors are also common in homes. They provide easy access to the closet.
• Offices: Double hinged office doors are used in many offices. They give the office a professional look. They also allow for easy access and traffic flow between rooms. Double-hinged conference room doors are also common in offices. They provide a formal entrance to the conference room.
• Hotels: Double-hinged guest room doors are common in hotels. They give the guest room a luxurious and welcoming look. They also allow for easy access and luggage transport. Double-hinged hotel lobby entrance doors are also common. They make a grand entrance for guests and visitors.
• Stores: Double-hinged retail store entrance doors are very common. They attract customers and allow for easy entry and exit. They also allow for visibility of the merchandise. Double-hinged display case doors are also common in stores. They allow customers to see the products inside the case.
• Public buildings: Double-hinged doors are used in many public buildings such as libraries, museums, and government buildings. They give the building an elegant and imposing look. They also allow for easy access and movement of people and large objects.
• Factories: Double-hinged loading dock doors are often used in factories. They are strong and durable. They can withstand heavy use and traffic. They also allow for the easy movement of pallets and machinery in and out of the loading dock.
• Healthcare facilities: Double-hinged patient room doors are commonly used in hospitals and clinics. They give the rooms a clean and sterile look. They also allow for easy access and movement of medical staff and equipment. Double-hinged operating room doors are also common. They are usually soundproof and can be sealed to prevent contamination.
• Schools: Double-hinged classroom doors are commonly used in schools. They give the classrooms a professional look. They also allow for easy access and movement of students and teachers. Double-hinged gymnasium doors are also commonly used. They are large and strong and can withstand heavy use.

How to Choose Double Joint Hinge

Before choosing the kind of double joint hinge to buy, the buyer should consider some factors to ensure they get the right one for their needs. They should look at the durability and material, weight and size of the door or gate, the angle of the opening, the finish, and the ease of installation.

The double joint hinge can rust if it is not made with the right material. It is important to choose one that is made with a durable material that can withstand weather elements, especially for those that will be used on external doors or gates. Look for options like aluminum or stainless steel 180 degree hinge because they offer better strength and resistance to corrosion.

The type of double joint hinge to purchase also depends on the weight and size of the door or gate. Doors or gates that are heavy or large will require a double joint hinge that can provide adequate support and bear the weight. Such hinges are usually more robust and come with more fastening points. But for lighter doors or gates, the standard double joint hinge will suffice.

The opening angle is another important factor to consider when choosing a double joint hinge. The double joint hinge allows doors to open at angles ranging from 90 to 180 degrees. This type of hinge is used when full swing is required. If the intention is to have a door that can open beyond 90 degrees, then a double joint hinge is appropriate.

Finishes play a vital role in both aesthetics and functionality. The finish is not just for looks; it offers protection against weather elements. For those double joint hinges used on external doors or gates, the finish should be able to resist weather elements. For those used indoors, the base material will suffice.

Most double joint hinges come with installation accessories like screws. They are also easy to install, but there are some that will require welding and professional assistance to fit properly.

double joint hinge Q&A

Q1. What is the difference between a piano hinge and a continuous hinge?

A1. A piano hinge and a continuous hinge are similar terms. A continuous hinge is a joint that runs the full length of two connected parts. It provides uniform support and is used for heavy-duty applications. All double-joint doors have continuous hinges.

Q2. What are the three types of hinges?

A2. The three types of hinges are butt, continuous, and piano hinges. A double joint hinge can fall under any of these categories. The hinges serve to attach two parts, allowing them to rotate and move relative to one another.

Q3. What is a double joint hinge used for?

A3. A double joint hinge is used to connect two parts, allowing them to move in two different places. It is mainly used for doors, windows, and other applications where double folding or multi-angle opening is required.

Q4. What is a swivel hinge?

A4. A swivel hinge is a type of joint that allows two connected parts to rotate and move about multiple axes. It can move in a horizontal and vertical direction and is mostly used for swivel chairs and adjustable lighting fixtures.