A portable information handling system housing rotationally couples housing portions with a dual axis synchronized gear to rotate about parallel spaced axes that define a radius to support folding of a flexible display. Each axis of the synchronized gear couples to a housing portion with a sliding bracket that adjusts length during rotation. Plural pivot arms couple to a main body of the hinge at the first and second axes and to the housing portions to manage spacing of the housing portions during rotation. A sliding member coupled to the main body engages with the plural pivot arms to synchronize rotation of the plural pivot arms and regulate torsional forces related to rotation of the housing portions that can damage a display film folding at the hinge.

An arm structure of an electronic device is provided. The arm structure includes an arm body, a first cam disposed on one side of the arm body and including a first hole into which at least a portion of a rotating shaft providing a folding operation of the electronic device is inserted, a peak and a valley being formed around the first hole, a second cam arranged side-by-side on a same axis as the one side of the arm body, spaced apart from the first cam, and including a second hole into which at least a portion of the rotating shaft is inserted, a peak and a valley being formed around the second hole, and a connecting part disposed on another side of the arm body and fastened with a rotating part providing rotation of the electronic device.

An access door assembly for an elevator car, the access door assembly including: an elevator car panel including an access hatch; an access door panel arranged to close the access hatch; and a hinge mechanism connecting the access door panel to the elevator car panel; the hinge mechanism allows the access door panel to move from an initial closed position in an initial plane to a final open position in a final plane substantially parallel to the initial plane; wherein the initial plane is the plane of the elevator car panel; and the hinge mechanism constrains the access door panel when opening to move perpendicular to the initial plane of the elevator car panel and to rotate around an axis perpendicular to the initial plane of the elevator car panel, to enable the access door panel to reach a final open position.

A door hinge device for a vehicle is capable of facilitating two doors to be simultaneously or independently opened or closed in a state in which rotation trajectories of the doors are ensured as a hinge bar connected to a carrier of a speed reduction unit through a hinge shaft and a rack and a pinion connected to a rotation shaft of a sun gear set a rotation amount of the doors during a process in which a hinge unit of the door moves along a rail in a diagonal direction toward the outside of a vehicle body in a vehicle including no B pillar.

Provided is an electronic device including a first housing, a second housing, and a lifting structure that includes a fixing body, a gear assembly including at least one connecting gear and a driven gear operably connected to the at least one connecting gear, in which the at least one connecting gear is connected to the fixing body, a first moving body including a guide gear and a guide rail, and a second moving body including an engaging portion.

A rotation shaft assembly includes a first lock accessory, a second lock accessory, a rotation shaft, a driven member, and a torsion mechanism. The rotation shaft includes a first member and a second member that are rotatable relative to each other, where the first member is fixedly connected to the first lock accessory, and the second member is fixedly connected to the second lock accessory. The driven member is connected to the first member or the second member, and is configured to be driven to rotate by the first member or the second member. The torsion mechanism is at least provided at the driven member and is configured to provide torsion during rotation.

A hinge apparatus that connects a first member and a second member to each other so that the first member and the second member are mutually foldable. The hinge apparatus includes a first gear disposed on the first member to rotate according to a rotation of the first member and a second gear disposed on the second member and tooth-engaged with the first gear to rotate according to a rotation of the second member or a rotation of the first gear. The hinge apparatus also including a pressure member to reinforce a mesh force between the first and the second gears.

A foldable display device includes a first plate member, a second plate member, a hinge assembly, and a flexible display member. The first plate member includes a first display surface and a first side. The second plate member includes a second display surface and a second side. The first side and the second side are close to each other. A first hinge member and a second hinge member of the hinge assembly are respectively connected to the first plate member and the second plate member. The flexible display member includes a first portion, a second portion, and a middle portion. The first portion contacts the first display surface. The second portion contacts the second display surface. The middle portion is between the first side and the second side. The first and second hinge members rotate relatively to have the flexible display member spread to be flat.

A hinge structure may include at least some of: a first rotary bar, a second rotary bar, a first interlocking gear bar and a second interlocking gear bar, a first support bar and a second support bar, a third interlocking gear bar and a fourth interlocking gear bar, a third support bar and a fourth support bar, a first fixing shaft, a second fixing shaft, a third fixing shaft, a fourth fixing shaft, a first connection shaft, a second connection shaft, a third connection shaft, and a fourth connection shaft, wherein each of the third fixing shaft and the fourth fixing shaft may include a column part, and rail bosses protruding from an outer peripheral surface of the column part, and each of the first interlocking gear bar and the second interlocking gear bar may include a first shaft insertion hole for insertion of the third fixing shaft, and a first hole extension part extending from the first shaft, and into which a first rail boss formed in the third fixing shaft is to be inserted.

A hinge includes a base frame unit and a rotating unit. The base frame unit includes a base seat having two rotating recesses and a transmitting recess, and two interfering plates respectively disposed in the rotating recesses. The rotating unit includes two rotating members respectively and rotatably disposed in the rotating recesses, and a bevel gear member disposed in the transmitting recess. Each rotating member frictionally interferes with the respective interfering plate, and has a bevel gear portion meshing with the bevel gear member. A torque generated as a result of rotation of one rotating member is transmitted through the bevel gear member to rotate the other rotating member relative to the base seat so as to make stable synchronous rotation of the rotating members.