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Guide on How to Select Torque Hinges

Sugatsune’s Motion Design Tech uses torque technology in the engineering and design of its hardware to provide soft-close, free-stop, power-assist, click, and unique motions for the safety, convenience, and efficiency of its users. Sugatsune currently offers over 120 models of hinges, lids supports and dampers which use torque technology.

What is Torque Technology?

Products that feature torque technology have the ability to retain their angle and position even when a force is applied. Hinges, dampers, and lid supports that contain torque technology contain one of the following three mechanisms: Disk, Curl, and Pipe Structure: Disk Torque Mechanism consists of several moveable disks that are sandwiched with fixed disks to create friction. Curl Torque Mechanism generates friction by rotating a shaft inside a rolled spring sheet. Pipe Structure Mechanism generates friction torque by rotating a shaft that is press-fitted into a plastic pipe. The functionality of these mechanisms makes products with torque particularly useful for vehicles, lighting fixtures, and equipment used in medical environments, manufacturing, and food production facilities.

Torque hinges are available in several forms, such as butt hinges, bracket hinges, concealed hinges (HG-TU), swivel or dual axis hinges. Additionally, some torque hinges have the capability to have torque adjustment and one-way torque features (HG-TQJ100), reducing the potential for injury in stressful environments.

For example, the HG-TS torque hinge uses friction to resist motion creating a free-stop function that holds a flap, lid or cover in position preventing the lid from falling over. Additionally, the HG-DTA is a torque hinge with a detent feature that helps prevent springing back when closing a lid. Lastly, the HG-PA features a power-assist motion that helps alleviate the strain that can be caused by lifting heavy lids.

What is Torque Moment?

Torque Moment is a calculation that determines the force required to rotate a door/ lid along its axis; it may be calculated for both flat and cantilevered doors and lids. To calculate Torque Moment, one must consider the proportion of the weight and height (dimension which is perpendicular to the hinge(s)) of the door/ lid.

How to Calculate Torque?

Standard Torque Formula:
TR= Weight (lbs.) x (Height (inches) / 2)

Torque Formula with Cantilevered Lids:
TR = X + Y
(X) = Weight (lbs.) x Height (inches) / 2
(Y) = Vertical Length to Center Point of Overhang Piece (inches) x Weight of Overhang Piece (lbs.)

For more technical assistance on calculating torque rating, please contact [email protected].

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