FRICTION HINGES (CONSTANT TORQUE HINGES)

Friction hinges (constant torque hinges, positioning hinges) are pure mechanical components, used to hold an object in the desired position. Typical applications are monitors in laptop and industrial applications, special suitcases, office equipment, safety equipments, lids, doors, arms, seat rests, etc.

The working principle is based on friction between input and output shaft; that's why position hinges are also called friction hinges; to generate the desired torque an according number of clips is put on the shaft. Precision clips and shaft components, a proprietary lubricant, and a proprietary manufacturing process form the basis for Reell’s technology for providing consistent torque over life. Torque increments are achieved through the addition of clips and allow custom torque specifications with standard components. Standard torque tolerance over life is a maximum of +/-15% with zinc and +/- 20% with insert plastic molded parts.

One of the main qualitiy aspects for friction hinges is the difference between static and dynamic torque. Clip technology allows a close and predictable relationship between static and dynamic torque, and specification of higher torques without compromising torque tolerance or life. The breakaway torque in our hinges is really close to the dynamic torque which provides a convinient jerkfree movement - and due to "Reell's Torque Engine" with clip technology the torque remains consistent over life. 

The main features of our friction hinges:

• constant torque over whole angular range
• extremely small volume
• no backlash (only small spring back after taking back the driving torque)
• designed for indoor applications (for outdoor applications special corrosion protection required)
• high life time with up to more than 30,000 cycles
• custom designs possible

The mounting area requires special consideration because our friction hinges provide high torque in a small package. Therefore the mounting are must be able to support the high forces and torques without being distorted or suffer from material fatigue.

Positioning hinges are available as external versions or for integration into the rotating axis.