A hinge pin that allows for clean and convenient internal lubrication of associated door hinge assemblies, including: a head, a body, and a tip; wherein the head includes a fluid reservoir, and a fluid input aperture; wherein the body includes a first end, a second end, wherein the first end and the second end define a length therebetween, at least one fluid output aperture, a primary bore, and a secondary bore; and wherein the primary and secondary bores are positioned between the fluid input aperture and the at least one fluid output aperture, and define a pathway for fluid flow therebetween.

A hinge pin that allows for clean and convenient internal lubrication of associated door hinge assemblies, including: a head, a body, and a tip; wherein the head includes a fluid reservoir, and a fluid input aperture; wherein the body includes a first end, a second end, wherein the first end and the second end define a length therebetween, at least one fluid output aperture, a primary bore, and a secondary bore; and wherein the primary and secondary bores are positioned between the fluid input aperture and the at least one fluid output aperture, and define a pathway for fluid flow therebetween.

A hinge structure connected between two bodies of an electronic device is provided. The bodies are rotated to be folded or unfolded relatively through the hinge structure. The hinge structure includes a first rotating shaft, a second rotating shaft, and a torsion member that the first and the second rotating shafts being pivoted thereto, such that the torsion member surrounds and grasps an axial surface of the first rotating shaft and an axial surface of the second rotating shaft respectively. The first rotating shaft has a first actuating portion and a second actuating portion. The second rotating shaft has a third actuating portion and a fourth actuating portion. The torsion member has a first torsion providing portion located on a moving path of the first and the second actuating portions and a second torsion providing portion located on a moving path of the third and the fourth actuating portions.

A portable electronic device including a first body, a second body, a first hinge connected to the first body, a second hinge connected to the second body, and a linking rod is provided. The linking rod has a first end and a second end opposite to each other, wherein the first end is pivoted to the first hinge eccentric to a rotation axis of the first hinge, and the second end is pivoted to the second hinge eccentric to a rotation axis of the second hinge. The first and the second bodies are rotated to be closed to or far away from each other by the first hinge, the second hinge, and the linking rod.

A protective case for a tablet computer includes a first support plate, a second support plate, and a cover plate that are located in a same horizontal plane and that are sequentially arranged in a first direction, where the first support plate is hinged to the second support plate by using a damping rotating shaft, the second support plate is rotatably connected to the cover plate, a bottom support is disposed on an edge of one end that is close to the cover plate and that is of an upper surface of the second support plate, the first support plate and the second support plate are configured to support and protect a rear surface of a tablet computer, the bottom support is configured to be detachably connected to a side wall of the tablet computer.

A gate hinge pin and strap assembly for attachment to a wooden post for supporting a gate including a J-bolt or threaded L-bolt with a metal strap affixed to the bolt between the threads and cylindrical neck portion. A bendable metal strap extends on each side of the J-bolt or threaded L-bolt. The L-shaped rod is threaded into the post until the metal strap contacts the post. Then each bolt of the metal bracket is bent around the post and screws or lag bolts are threaded through the holes and into the post to help secure the hinge to the post and to provide added support for the gate.

A protective case for a tablet computer includes a first support plate, a second support plate, and a cover plate that are located in a same horizontal plane and that are sequentially arranged in a first direction, where the first support plate is hinged to the second support plate by using a damping rotating shaft, the second support plate is rotatably connected to the cover plate, a bottom support is disposed on an edge of one end that is close to the cover plate and that is of an upper surface of the second support plate, the first support plate and the second support plate are configured to support and protect a rear surface of a tablet computer, the bottom support is configured to be detachably connected to a side wall of the tablet computer.

A rotating coupling system for a closing element, such as a door, window, door or the like, and a stationary support structure, such as a wall, floor, frame or the like includes a hinge device anchorable to the closing element and a mounting plate anchorable to the stationary support structure. The hinge device has a hinge body and a pivot defining a first axis, and are coupled each other to rotate one with respect to the other around the axis. In particular, the pivot includes a coupling portion, which protrudes from the hinge body, and the mounting plate includes a plate-shaped body having a seat that receives the coupling portion of the pivot. The plate-shaped body further includes an adjusting member to adjust its position with respect to the stationary support structure.

A pivoting device having helical gear includes a first shaft and a second shaft, wherein the first shaft has a first rod, the first rod has a first axial gear, and the second shaft has a second rod, the second rod has a second axial gear. A first connecting plate is connected between the first shaft and the second shaft, and a connecting gear set is arranged between the first shaft and the second shaft, the connecting gear set meshes with the first axial gear and the second axial gear. One end of the connecting gear set is connected to the first connecting plate, and the other end of the connecting gear set is connected a second connecting plate. The first torque set is connected between the first shaft and the second shaft. A third connecting plate is connected between the first shaft and the second shaft.

A hinge (FIG. 1) with an adjustable built-in door stop mechanism. The hinge contains two leaves and a hinge pin. The first leaf with three knuckles has various receptacles (4) on both the upper and lower knuckles (3) to ensure the door stop works with both right and left-handed doors. The hinge also contains a standard hinge pin (5) that includes a flag (6) immediately at the base of the pin head. The hinge is designed to stop when the pin flag (6) is inserted into one of the pin flag receptacles (4) limiting the swing range of motion of the hinge. The second leaf (2) will rotate until making contact with the pin flag (6) and the top knuckle (3), stopping the hinge from rotating any further. The appropriate pin flag receptacle (4) selected is based on the required swing of the hinge.