US Patent 11579661 Portable information device and hinge device

A portable information device includes: a first chassis, a second chassis adjacent to the first chassis, and a hinge device that relatively rotatably connects the first chassis and the second chassis. The hinge device includes: a first torque generating part that generates a rotation torque in relative rotation of a first base plate and a first link plate by sliding resistance between the first base plate and the first link plate, and a second torque generating part that generates a rotation torque in relative rotation of a second base plate and a second link plate by sliding resistance between the second base plate and the second link plate.