David - If you want it to just stop at the open 180 degree level, you
could use a piece of bar stock on one side and angle iron on the other.
Round the end of the bar stock and have the pivot at the end. Put the
pivot a couple inches back on the angle iron. When flat, the bar will
hit the edge of the angle and stop. You could also do this with nested
square tubes. Just cut off one side from the larger one a few inches back.
You could make it lock by adding a sleeve with a spring that slides over
the joint.
Brian
On 5/16/2012 6:13 PM, David Hillman wrote:
I have a shop project ( <-content ) I want to build, but I need a pair
of hinges for it. It seems like I should be able to find something
similar and repurpose it, since my requirements are not
overly-specific, but I can't. I may not be looking in the right places.
I need to join two elements, let's say 1" square steel tubes, although
that's negotiable, end-to-end, like the bones of a human arm (
pretending the radius and ulna are one bone, for the moment ). The key
is, when extended, I need it to lock automatically ( manual release is
fine ). I think I could build it, if necessary, but first, can I buy
something like this? Doesn't need to be massively strong, say, 200
pounds load would be very safe. 90* bend would be nice, but anything
more than 45* could probably be made to work.
McMaster and other typical sources don't seem to have anything, but
again, I might be missing it.
Thanks for any brain storms you might have.
--
David Hillman
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