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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