A foldable display device includes a first support plate and a second support plate, a display panel disposed on the first support plate and the second support plate and a hinge assembly disposed between the first support plate and the second support plate, wherein the hinge assembly includes, a first hinge arm and a second hinge arm rotatably connected to each other, a first virtual axis gear coupled to the first hinge arm, a second virtual axis gear coupled to the second hinge arm, a first rotational gear and a second rotational gear disposed to mesh with each other between the first virtual axis gear and the second virtual axis gear and a first gear arm and a second gear arm fastened to interlock with the first virtual axis gear and the second virtual axis gear, wherein the first support plate, the second support plate, and the display panel perform folding and unfolding operations about a rotation axis different from central axes of the first virtual axis gear and the second virtual axis gear.

A hinge apparatus may include a plurality of plates configured to be rigidly coupled to a foldable component, and a plurality of gears mechanically coupling the plurality of plates to one another. The hinge apparatus may be operable to expand such that, when the hinge apparatus transitions from a flat state to a folded state, the plurality of gears are configured to cause the plurality of plates to translate laterally apart from one another at a selected rate.

An opening/closing device includes a fixed member, an opening/closing member, and a hinge device. The fixed member has inside wall sections and pin insertion holes. The opening/closing member has outside wall sections and pin supporting holes. The hinge device has a case that is inserted and held between the inside wall sections, pressing members that are disposed inside the case and are capable of rotating, a spring disposed between the pressing members, and pin members that are inserted through the pin supporting holes and the pin insertion holes and engage with the pressing members. The pin members are inserted through the pin supporting holes and the pin insertion holes from the outside of the outside wall sections.

A hinge apparatus may include a plurality of plates configured to be rigidly coupled to a foldable component, and a plurality of gears mechanically coupling the plurality of plates to one another. The hinge apparatus may be operable to expand such that, when the hinge apparatus transitions from a flat state to a folded state, the plurality of gears are configured to cause the plurality of plates to translate laterally apart from one another at a selected rate.

A door hinge with a damping function which is implemented according to the flow of oil when opening and closing a door so that a buffering force is applied during opening of the door, closing of the door is carried out smoothly. Due to rapid return of a damper unit, the damper unit immediately operates even when the door is closed immediately after being opened, thereby enabling smooth opening and closing of the door.

In one example, a hinge assembly is disclosed, which may include a band torque engine having at least one bearing portion and a vertical torque engine coupled to the band torque engine. The vertical torque engine may have an opening. The hinge assembly may include a first shaft received through the at least one bearing portion and the opening. The first shaft may be rotatable along an axis with respect to the band torque engine and the vertical torque engine. The hinge assembly may include a display bracket including an adaptor portion to hold the first shaft such that the first shaft rotates along with the display bracket. The band torque engine may provide a frictional torque and the vertical torque engine may compressively engage with the first shaft to provide a vertical frictional torque during rotation of the display bracket.

In an example, a device includes a base unit, a cover unit, and a hinge assembly to couple the cover unit to the base unit The hinge assembly is moveable between a folded position and an unfolded position. The hinge assembly includes a channel, an annular holder disposed in the channel, a shaft engaged with the annular holder, and a hydraulic cylinder coupled to the shaft. The hydraulic cylinder is to move the shaft along a longitudinal axis of the shaft, based on a movement of the hinge assembly between the folded position and the unfolded position, to vary an operating torque of the hinge assembly.

In an example, a device includes a base unit, a cover unit, and a hinge assembly to couple the cover unit to the base unit The hinge assembly is moveable between a folded position and an unfolded position. The hinge assembly includes a channel, an annular holder disposed in the channel, a shaft engaged with the annular holder, and a hydraulic cylinder coupled to the shaft. The hydraulic cylinder is to move the shaft along a longitudinal axis of the shaft, based on a movement of the hinge assembly between the folded position and the unfolded position, to vary an operating torque of the hinge assembly.

The description relates to hinged devices, such as hinged computing devices. One example can include an expandable hinge assembly that rotatably secures a first portion and a second portion. The example can also include a hinge assembly positioned between the first portion housing and the second portion housing and that includes first and second rotatable links that are rotatable relative to both the hinge assembly and the first and second portions.

A damped hinge assembly for mounting a first member for rotational movement relative to a base member about a hinge axis is provided. The assembly includes a first linearly acting damping device, and first camming means for converting rotational movement of the first member in a first direction into linear actuation of the first damping device to cause it to impart a damped resistive force to the first member over at least part of its movement in said first direction. The first damping device is mounted with its linear axis coincident with the hinge axis, with the first damping device acting as a fulcrum for said rotational movement of the first member.