I want a joint that can be flexed in two directions at right angles to
each other. In principle I could do this using two hinges with one
plate of one hinge fixed at right angles to one plate of the other.

Is there a 'ready made' piece of hardware that can do this? If so,
what is it called?

I don't want a ball joint because movement in all directions isn't
necessary and a ball joint generally won't allow 90 degrees (or more)
of flexion like a hinge.

The device I want would allow me to fix a bar to a surface and swing
it 180 degrees in two planes (at 90 degrees to each other).

--
Chris Green
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