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Mechanism/Links with Bisecting link?

Mechanism/Links with Bisecting link?

Mechanism/Links with Bisecting link?

(OP)
I've been fiddling with some hand sketches/CAD and going through some references and I'm trying to create a simple mechanism to incorporate around a hand tool. Here's the simplified description:

I have two bars/links pinned together at end points free to rotate around the pin. Now, I want to add another link which will always bisect the two main links. Example, If the angle between the two main links is 175*, then the angle between any one main link and the bisecting link is 87.5*. i.e. always half angle. I've been trying to play with some linkages/levers and possibly some inline gear-reduction but that seems a  little clunky. Total range of motion of main links can be something like 120* - 220* angle between the main links.

Any suggestions/references?

Thanks in advance.

RE: Mechanism/Links with Bisecting link?

(OP)
Perfect! I was pretty close to that with some slider, but not quite there. For whatever reason, I was stuck with trying to hold one of the main links fixed and only moving the bisector and other main link.

Thanks!

 

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