Geared hinge

by fma, published

Geared hinge by fma Jun 10, 2013
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Geared hinge by fma is licensed under the Creative Commons - Attribution license.

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Proof of concept of a geared hinge. Should be possible to motorize it.

Inspired from a commercial shower screen.

I printed it: works fine!


  • print 2 of each half hinge type;
  • print 1 link;
  • glue 2 half of the same hinge type together (you can use 3mm filament to get a good alignement);
  • insert the link and screw each hinge with a M4x50.

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I was thinking about such a mechaninsm as a possible solution to a problem which future nanomachines will encounter.
arms with a simple hinge can not turn a lot more then halve of the
total space angle of 4pi but in some
applications a high reflex angle would be present (e.g. when the robotic arm is mounted on an outside corner
of a cube).
If overstraind over its accessible range of motion the
arm wold likely break to dangerous crystalline nanosplinters (lever
effect; dangerous for machines and humans). To allow the arm to touch its parent body on all sides and thus
make the design a lot more over-compression resilient adding a short
segment which can increase the accessible angle is the natural approach
but it adds an unneccessary degree of freedome (DOF) which has to be
controlled in some way (Free DOFs are dissalowed in pure machine phase
nanomachines). The thing you published here is about the easiest way to
control this introduced DOF. :)
The only problem is that the trajectory
of the tip of the robotic arm will be no longer describable by simple
spherical coordinates and the necessary computing power for steering or data tables is something that can't be too localized in nanomachines
(computers are big in the nanocosmos). So a design with more complexity in the hardware and less in the (possibly mechanic) logic where
only one hinge moves in a certain range and only the other hinge in the
complementary range might be preferrable.

Interesting: The effective point of rotation moves here to infinity and can even come back from the other side.

:o)))) I would love to see a nano geared hinge!