Compact rotation locking mechanisms for detachable load bearing pivoting support elements

1. A hinge or clamp assembly comprising:

a first plate or arm including a slot or aperture and outer cylindrical bores on opposite sides of the slot, or aperture, wherein the outer cylindrical bores are coaxial along the longitudinal axis of the bores;

a second plate or arm seated in the slot, or aperture, of the first plate or arm, wherein the second plate or arm moves rotationally relative to the first plate or arm about the longitudinal axis of the bores;

two mirrored cylinders or stepped cylinders on opposite ends of the second plate or arm, wherein the two mirrored cylinders or stepped cylinders are coaxial with the longitudinal axis of the bores and slide in opposite direction along the longitudinal axis of the bores to engage and disengage with the outer cylindrical bores;

a locking mechanism including the two mirrored cylinders or stepped cylinders and a common biasing mechanism configured to urge the two mirrored cylinders or stepped cylinders in opposite directions along the longitudinal axis of the bores, wherein the mirrored cylinders or stepped cylinders each have an outer surface with at least one first locking region with faceted sides, ridges, or teeth in which the faceted sides, ridges, or teeth are non-sloping relative to the longitudinal axis of the bores;

each of the outer cylindrical bores includes at least one chamber coaxial with and receiving a respective end of one of the mirrored cylinders or stepped cylinders, wherein the at least one chamber includes at least one second locking region which includes an internal wall with faceted, ridged, or toothed internal surfaces that are non-sloping relative to the longitudinal axis of the bores; and that are configured to receive and interlock with the faceted sides, ridges, or teeth of the at least one first locking region on the outer surface of a respective mirrored cylinder or stepped cylinder;

wherein the mirrored cylinders or stepped cylinders have a locked position where the at least one first locking region of the cylinders or stepped cylinders is interlocking partially or fully with the at least one second locking region of the at least one chamber of the outer cylindrical bores such that the second plate or arm is prevented from rotating relative to the first plate or arm; and

wherein the mirrored cylinders or stepped cylinders have an unlocked position where the at least first locking region of the cylinders is disengaged from the at least one second locking region of the at least one chamber of the outer cylindrical bores to allow the second plate or arm to pivot freely relative to the first plate or arm; and

wherein each of the mirrored cylinders or stepped cylinders is connected to a release post that is configured to be manually displaced to urge the mirrored cylinders or stepped cylinders axially along the longitudinal axis of the bores in a direction to disengage the first and second locking regions, thereby allowing the second plate or arm to pivot relative to the first plate or arm.

2. The hinge or clamp assembly of claim 1 wherein the mirrored cylinders or stepped cylinders have a detached position where the mirrored cylinders or stepped cylinders are positioned fully outside of the outer cylindrical bores which allows the second plate or arm to be fully detached from the first plate or arm.

3. The hinge or clamp assembly of claim 1 wherein the biasing mechanism of the mirrored cylinders or stepped cylinders is at least one of a U-shaped rod or brace, a coil spring, a sponge, an elastically deformable shaft or a compressible gas.

4. The hinge or clamp assembly of claim 1 wherein the second plate or arm is a U-shaped rod or brace having opposite ends each including one of the two mirrored cylinders or stepped cylinders.

5. A hinge or clamp assembly comprising:

a first plate or arm including a slot or aperture and protruding cylinders on opposite sides of the slot or aperture wherein the protruding cylinders are coaxial along their longitudinal axis; and wherein each protruding cylinder has an outer surface with at least one first locking region with faceted sides, ridges, or teeth; in which the faceted sides, ridges, or teeth are non-sloping relative to the longitudinal axis of the protruding cylinders;

a second plate or arm seated in the slot or aperture of the first plate or arm, wherein the second plate or arm moves rotationally relative to the first plate or arm about the longitudinal axis of the protruding cylinders;

two mirrored hollow cylinders on opposite ends of the second plate or arm, wherein the two mirrored hollow cylinders are coaxial with the longitudinal axis of the protruding cylinders and slide in opposite direction along the longitudinal axis of the protruding cylinders to engage and disengage from the protruding cylinders;

a locking mechanism including the two mirrored hollow cylinders and a common biasing mechanism configured to urge the two hollow mirrored cylinders in opposite directions along the longitudinal axis of the protruding cylinders, wherein each of the mirrored hollow cylinders includes at least one chamber coaxial with and receiving a respective end of one of the protruding cylinders, wherein the at least one chamber includes at least one second locking region in which the at least one second locking region includes an internal wall with faceted, ridged, or toothed internal surfaces that are non-sloping relative to the longitudinal axis of the protruding cylinders and that are configured to receive and interlock with faceted sides, ridges, or teeth of the at least one first locking region on the outer surface of the protruding cylinders;

wherein the mirrored hollow cylinders have a locked position where the at least one second locking region of the hollow cylinders is interlocking partially or fully with the at least one first locking region of the protruding cylinders such that the second plate or arm is prevented from rotating relative to the first plate or arm, and

wherein the mirrored hollow cylinders have an unlocked position where the at least one second locking region of the hollow cylinders is disengaged from the at least one first locking region of the outer cylinders to allow the second plate or arm to pivot freely relative to the first plate or arm; and

wherein each of the mirrored hollow cylinders is connected to a release post that is configured to be manually displaced to urge the mirrored hollow cylinders axially along the longitudinal axis of the bores in a direction to disengage the first and second locking regions, thereby allowing the second plate or arm to pivot relative to the first plate or arm.

6. The hinge or clamp assembly of claim 5 wherein the hollow cylinders have a detached position where the hollow cylinders are positioned fully outside of the protruding cylinders which allows the second plate or arm to be fully detached from the first plate or arm.

7. The hinge or clamp assembly of claim 5 wherein the biasing mechanism is at least one of a U-shaped rod, or brace, a coil spring, a sponge, an elastically deformable shaft or a compressible gas.

8. The hinge or clamp assembly of claim 5 wherein the second pate or arm is a U-shaped rod or brace having opposite ends each including one of the two hollow cylinders.