A multi-link hinge assembly includes first and second link levers, first and second sliding rods, first and second bases, a central shaft, and first and second torque shafts. The first link lever is connected to the second base by the second torque shaft and is slidable along with the first sliding rod within the first base. The second link lever is connected to the first base by the first torque shaft and is slidable along with the second sliding rod within the second base. The central shaft extends through the first and second link levers. When the second base is rotated relative to the first torque shaft, the first and second sliding rods move toward the central shaft.

A pivot structure includes a base, a bracket, an elastic component, and a positioning assembly. The bracket is rotatably connected to the base. The elastic component is disposed on the base. The positioning assembly includes an elastic clip and a pillar. The elastic clip is pivoted to the base and has a first releasing segment and a first positioning segment. The pillar is connected to the bracket and has a second positioning segment. The pillar is rotatably clipped in the elastic clip. The bracket is adapted to be expanded to a first expanding state through an elastic force of the elastic component, so as to drive the second positioning segment to move along the first releasing segment. The bracket is adapted to receive an external force to be further expanded to a second expanding state, so as to drive the second positioning segment to move to the first positioning segment.

A hinge assembly, including a rotating shaft and a pair of cams, is provided. The cams are sleeved on the rotating shaft so as to be rotatable relative to each other. The pair of cams respectively has a first flat surface and a second flat surface facing each other, and a curved surface adjacent to the first flat surface and the second flat surface. The first flat surface of one of the cams passes by the curved surface to move from one flat surface to the other flat surface of the other cam, so as to enable the pair of cams to move relatively away or closer along an axial direction of the rotating shaft. The curved surfaces of the cams are in surface contact when the first flat surface passes by the curved surface. A portable electronic device is also provided.

A device is disclosed as including a hinge disposed intermediate of a display and a keyboard. the hinge includes an at least partially cylindrical housing and a friction band, the hinge providing rotation of the display and the keyboard around a pivot axis extending longitudinally along the hinge. The friction band comprises one or more compression members configured to extend around the pivot axis and in a compressed configuration with an inner surface of the housing to create friction between the inner surface of the housing and an outer surface of the one or more compression members.

An arm cap friction hinge mechanism may include a center link; a first top link, a top friction hinge link, a second top link, and a top pin link coupled to the center link; an upper hinge mount coupled to an arm cap, to the first top link, and to the top friction hinge link via a first friction hinge; an upper pin mount coupled to the arm cap of the aircraft seat, to the second top link, and to the top pin link. The center link may be coupled to at least one hinge mount via at least a second friction hinge. The arm cap may be configured to actuate between a closed position and a first open position around the first friction hinge, and between the first open position and a second open position about an axis through the at least a second friction hinge.

A hinge structure may comprise a first assembly including a central post with an outer surface and a first connector element on the central post for mounting on a first structure, a second assembly pivotally coupled to the first assembly and including a ring extending about the central post, a ring connector connected to the ring, and a second connector element on the ring for mounting on a second structure. A braking element may apply a selectable amount of resistance to pivot movement of the second connector element with respect to the first connector element and including a friction pad extending about a portion of the central post, a pressure band for pressing the friction pad against the central post, and a connecting structure connecting the ends of the band and being adjustable to move the ends closer toward each other and to relax the ends away from each other.

A portable information handling system includes a variable torque hinge that increases torque to resist hinge rotation when the information handling system housing rotates to a writing position, such as rotation to a range of between 300 and 350 degrees. In one embodiment, a sequential hinge rotates in the writing range about one axle that has increased friction in the desired writing range generated by a cam having a variable surface area and depth to work a variable friction between a friction structure and axle end cap.

A hinge assembly includes a guiding unit connected between and slidable relative to first and second hinge units along arcuate lines. The second hinge unit has a pivot shaft extending through first and second rings, and a resilient washer. The second ring is rotatable on the pivot shaft relative to the first ring and has a radial extension member telescopically connected to a pivotal arm of the first hinge unit. The resilient washer pushes the second ring against the first ring. A protrusion of the first ring slides along a contact surface of the second ring having a groove so that a variable friction toque is created against relative movement of the first and second hinge units.

A biaxial hinge is provided which includes a rotation cam part including a first rotation cam part and a second rotation cam part configured to rotate with hinge shafts as the center, wherein each of the first and second rotation cam parts include a plurality of pockets each of which comprises one side opened and is inwardly recessed, a sliding cam part comprising one side protruding in a direction of the rotation cam part and an incline so as to move upward and downward in cooperation with rotation of the rotation cam part and insert in the pocket, a guide part including a through-hole formed at a center portion and which one side of the projected sliding cam part perforates to guide movement of the sliding cam part, and a support part configured to support the sliding cam part at a lower portion of the sliding cam part.

A vehicle door control system is provided, and includes a body hinge member connected to the vehicle body, a door hinge member connected to the door, a brake and a control system. The brake includes a plate pack that includes a plurality of body brake plates connected to the body hinge member, and interleaved with a plurality of door brake plates connected to the door hinge member. The plate pack is positionable in a braking state in which the body brake plates and the door brake plates are frictionally engaged with one another to provide a first resistance to relative rotation therebetween so as to hold the vehicle door in a selected position, and a release state in which the body brake plates and the door brake plates provide a second resistance to relative rotation therebetween that is less than the first resistance.