Friction (torque or position control hinges) constantly resist pivoting motion. It holds doors, lids and flaps, panels, displays, windows, and more in position for easy access. They prevent spring back, hard slamming, and accidental closing of equipment. The knuckle structure of the friction hinge creates resistance. This type of hinge can be used in one direction or bi-directionally.
Disc Friction
A disc-type friction hinge uses one or multiple clips radially compressed on a shaft to generate rotational torque. This mechanism is commonly used as a position control hinge in laptop computers to support the computer screen at various angular positions relative to the base. It is also used in automobile headrests to support windshield visors at multiple angles. The key to a successful friction hinge is its ability to resist the torque it will be subjected to. It means that the hinge’s specification needs to match or exceed the amount of force that will be exerted on the hinge. A friction hinge manufacturer can achieve this by machining the discs to eliminate thickness variation and lateral run-out that could lead to uneven friction or a non-perpendicular hub face.
Metals
Aluminum is a commonly used material in friction hinges. It is easy to work with and offers a high strength-to-weight ratio. It also has good corrosion resistance. Friction hinges, sometimes torque hinges, offer continuous resistance to a door or lid’s pivoting action. They can keep tops or devices from slamming closed and help position them at any desired angle. The invention includes a frictional member molded in the shape of a stack of rings arranged coaxially. It allows the frictional member to be inserted into a shaft without needing to mold different disks or machine them in various diameters. A spacer is provided between the end discs to maintain spacing and prevent a pathway for dirt from entering the hinge.
Pipe Friction
Pipe friction hinges are designed to replace gas shocks and hatch springs in some applications. They can hold hatches, radio boxes, and more open without requiring additional energy from the user. Some friction hinges can be oriented to separate the lid and base horizontally rather than vertically. This arrangement allows laptop manufacturers to mount the hinge parts as subassemblies that can be joined during the final assembly of a finished laptop computer.
Curl Friction
A friction hinge can be used when products need to stay fixed. Also known as friction torque positioning or free stop hinges, they hold lids and panels in place without needing a spring or additional force. These hinges can work in one direction or both and can be designed to offer a specific amount of resistance. They are often available with a customizable amount of strength that can be easily adjusted by hand or with a hex wrench. Brass hinges are often used as friction hinges because they have high corrosion resistance and can support heavy loads. They are also easy to repair if they become damaged. They can be made from a mix of copper and zinc, which gives them great flexibility, strength, and durability.
Stainless Steel
Stainless steel is used for the frames of some friction hinges due to its resistance to corrosion and chemical reactions. These hinges are also hygienic, making them suitable for various applications, such as electronic enclosures or large freezer doors. Using the right type of friction hinge is crucial for proper positioning and movement. These hinges help to prevent spring back, hard slamming, or sudden closing of doors, windows, lids, panels, and displays. Adjustable friction hinges allow the position of an object to be changed without the need for additional hardware or installation. They use a setting screw to change the amount of friction torque. These hinges have concealed mountings for a sleek appearance. They are also available in a variety of finishes.
