A buttressed hinge assembly or a flexible hinge assembly adjusts to fit a vent on a wall or a roof in order to hold a fan thereon, which fan is especially suitable for a restaurant roof or wall. The hinge assembly attaches to a roof or wall vent to hold the fan in a proper position, yet permits the fan to be easily moved for cleaning of vent and the fan.

A vehicle door hinge with integrated door check. The vehicle door hinge includes a vehicle body bracket securable to a vehicle body, a vehicle door bracket securable to a vehicle door, a hinge pin providing a rotational connection between the vehicle body bracket and the vehicle door bracket, a door check plate having a bearing engagement surface, and a resiliently compressible bias positioned to axially bias the bearing engagement surface against bearings of the hinge pin.

A rotating shaft apparatus and an electronic device are provided, which include a first rotating mechanism and a second rotating mechanism. The first rotating mechanism includes a first ratchet and a first tooth. The first tooth can rotate with respect to the first ratchet in a first rotation direction. An engagement structure between the first tooth and the first ratchet makes the first tooth stop rotating in a second rotation direction. The first and second rotation directions are opposited. The second rotating mechanism is arranged coaxially with the first rotating mechanism, and includes a second ratchet and a second tooth. The second ratchet is in stop-rotation connection with the first tooth. The second tooth can rotate with respect to the second ratchet in the second rotation direction. An engagement structure between the second tooth and the second ratchet makes the second tooth stop rotating in the first rotation direction.

A door hinge with integrated door check is disclosed herein. The door hinge includes a first and second bracket connected by a hinge pin and rotatable relative to first bracket about an axis, and a door check plate. The hinge pin includes a plurality of bearings distributed about the axis. The door check plate has a bearing engagement surface axially opposed to the bearings, defining a plurality of curved paths, where the number of curved paths equals number of bearings, each curved path has a path length and an elevation profile of variable elevation that is substantially identical for all curved paths. A resiliently compressible bias is positioned in contact with the door check plate to axially bias the bearing engagement surface against the bearings so each bearing travels along the elevation profile of a respective curved path when the second bracket rotates relative to the first bracket.

One aspect is a detent hinge device having a first cam component with at least one spline and an axial cam face, the first cam component having a root diameter and an outer diameter. A second cam component has at least one spline and an axial cam face, the second cam component having a root diameter and an outer diameter. Each of the first and second cam components are aligned on an axis, wherein the cam faces of the first inner and first outer cam components face each other. An axial spring acts on the first cam component forcing it against the second cam component. An axial retention element securing each of the first and second cam components and axial spring on the axis. A first mounting bracket has splines on an inner surface. The first mounting bracket contains the first cam component such that the splines of the first mounting bracket engage the splines of the first cam component thereby transferring torque from the first cam component to the first mounting bracket via the splines. A second mounting bracket has splines on an inner surface. The second mounting bracket contains the second cam component such that the splines of the second mounting bracket engage the splines of the second cam component thereby transferring torque from the second cam component to the second mounting bracket via the splines. The first and second cam components comprise the same shape.