Torque hinge with clutch mechanism

A torque hinge comprising an inner ring and an outer ring that have a common rotation axis, and a connection member disposed between the inner ring and the outer ring so as to selectively connect/disconnect the inner ring and the outer ring by a required frictional force, the inner ring and the outer ring being rotatable integrally or relatively against the required frictional force, wherein

• the outer ring is inserted into a cylindrical support member so as to be supported by the cylindrical support member, and coil springs each having a pair of hook portions are mounted on an outer peripheral surface of the outer ring,
• a plurality of control members for controlling the coil springs are assembled in series in an axial direction with the cylindrical support member, the control members being rotatable about the common rotation axis with respect to the cylindrical support member, and the cylindrical support member having hook grooves into which one of the pair of hook portions of each of the coil springs is to be fitted and the control members each having a hook groove into which another one the pair of hook portions of a respective one the coil springs is to be fitted, and
• the coil springs retain or liberate the outer ring by a required operation.