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A load bearing rotation lock mechanism including disks or cylinders with teeth or a combination of both that interlock radially between their inner and outer surface areas, or frontal areas, or both, where one of the disks or cylinders is attached to a fixed surface area and the other disk or cylind

A load bearing rotation lock mechanism including disks or cylinders with teeth or a combination of both that interlock radially between their inner and outer surface areas, or frontal areas, or both, where one of the disks or cylinders is attached to a fixed surface area and the other disk or cylinder is attached to a pivoting arm, plate, or other kind of load bearing support element, and where one of the disks or cylinders is able to mesh (lock) and un-mesh (unlock) from the other disk or cylinder by protruding, retracting, or sliding laterally over a common, continuous or divided axis, shaft, or channel thereby freezing the angular position of the pivoting arm, plate, or other kind of load bearing support element with respect to the fixed surface area at the time the disks, cylinders, or a combination of both, mesh (lock) with each other and unfreezing the pivoting arm, plate, or other kind of load bearing support element to pivot freely with respect to the fixed surface area when the disks, cylinders, or combination of both un-mesh (unlock) from one another.

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1. A hinge or clamp assembly comprising: a first plate or arm including a slot and outer cylindrical bores on opposite sides of the slot, wherein the outer cylindrical bores are coaxial;a second plate or arm seated in the slot of the first plate or arm and the second plate or arm comprising a middle

1. A hinge or clamp assembly comprising: a first plate or arm including a slot and outer cylindrical bores on opposite sides of the slot, wherein the outer cylindrical bores are coaxial;a second plate or arm seated in the slot of the first plate or arm and the second plate or arm comprising a middle cylindrical bore coaxial with the outer cylindrical bores, wherein the middle cylindrical bore has a first end facing an end of one of the outer cylindrical bores and an opposite end facing another end of the outer cylindrical bores such that the middle cylindrical bore does not extend into the outer cylindrical bores, and wherein the second plate or arm moves rotationally relative to the first plate or arm about a longitudinal axis defined by the outer and middle cylindrical bores;a hinge shaft comprising a locking region with faceted sides, ridges, or teeth on an outer circumference of one end of the hinge shaft and a contiguous non-locking region that is smooth and cylindrical in shape spanning the remainder of the hinge shaft, wherein the hinge shaft is shorter in length than the combined length of the outer and middle cylindrical bores, is seated inside the outer and middle cylindrical bores, extends through the outer and middle cylindrical bores, and moves axially along the longitudinal axis of the outer and middle cylindrical bores;a first engagement cylindrical cavity with faceted, ridged, or toothed internal side walls located within one of the outer cylindrical bores, wherein the faceted, ridged, or toothed internal side walls of the first engagement cylindrical cavity are configured to receive and interlock with the faceted sides, ridges, or teeth of the locking region of the hinge shaft;a second engagement cylindrical cavity located within the middle cylindrical bore and adjacent the first engagement cylindrical cavity, wherein the complementary second engagement cylindrical cavity includes faceted, ridged, or toothed internal side walls and is configured to receive and interlock with the faceted sides, ridges, or teeth of the locking region of the hinge shaft;wherein the hinge shaft has an unlocked position where the locking region of the hinge shaft is positioned entirely inside the first engagement cylindrical cavity and does not extend into the second engagement cylindrical cavity,wherein, while the hinge shaft is in the unlocked position, the middle cylindrical bore and the second plate or arm are free to rotate relative to the outer cylindrical bores and the first plate or arm, andwherein the hinge shaft has a locked position where the locking region of the hinge shaft extends into both the first and second engagement cylindrical cavities and, while the hinge shaft is in the locked position, the middle cylindrical bore and the second plate or arm are prevented by the hinge shaft from rotation relative to the outer cylindrical bores and the first plate or arm, anda release post is coupled to the hinge shaft and is configured to be pushed or pulled to axially displace the hinge shaft between the locked and unlocked axial positions. 2. The hinge or clamp assembly of claim 1 further comprising a biasing mechanism that urges the hinge shaft axially along the longitudinal axis of the bores and into the locked position. 3. The hinge or clamp of claim 2 further comprising a second biasing mechanism that urges the first plate or arm and the second plate or arm to move away from each other into a default angular position. 4. The hinge or clamp assembly of claim 3, wherein the second biasing mechanism is a spring. 5. The hinge or clamp assembly of claim 3, wherein the second biasing mechanism is a coil spring. 6. The hinge or clamp of claim 1 wherein the locking region includes a locking segment fixed to the shaft. 7. A casing for an electronic device comprising: a back wall including a slot and outer bores on opposite sides of the slot, wherein the outer cylindrical bores are coaxial;a plate or arm seated in the slot of the back wall, wherein the plate or arm includes side edges each facing a respective wall of the slot;a middle bore extending through the plate or arm and having end openings in each of the side edges of the plate or arm, wherein the middle bore is coaxial with the outer cylindrical bores along an axis and does not extend into either of the outer cylindrical bores;a first locking cavity within one of the outer cylindrical bore and having an open end at one of the walls of the slot, wherein the first locking cavity has sidewalls with facets, ridges or teeth;a second locking cavity in the middle bore and having an open end at one of the side edges of the plate or arm, wherein the second locking cavity has facets, ridges or teeth, wherein the second locking cavity is adjacent to the first locking cavity along the axis;a shaft within and coaxial with the outer and middle bores, wherein a length of the shaft is less than a combined length of the outer and middle bores such that the shaft may be displaced along the axis while within the outer and middle bores;a locking segment fixed to the shaft wherein an outer surface of the locking segment includes facets, ridges or teeth which are complementary to the facets, ridges or teeth of the first and second locking cavities;wherein the shaft has an unlocked position in which the locking segment is within the first locking cavity and does not extend into the second locking cavity, and while the shaft is in the unlocked position the plate or arm is free to pivot with respect to the back wall;wherein the shaft has a locked position in which the locking segment extends into the first and second locking cavities and the facets, ridges or teeth of the locking segment engage the facets, ridges or teeth of the first and second locking cavities, anda release post coupled to the shaft and configured to be manually displaced to move the shaft between the locked and unlocked positions.