Is there a linkage mechanism allowing the summation of the throws of two crank and slider mechanisms oriented next to one another in order to control an output slider with a motion equal to the summed displacement of the two input crank?

Eg: if slider 1 is positions 5mm above it's equilibrium position at top dead centre and slider 2 is 3mm above it's equilibrium position at just below top dead center I want slider 3 (the output) to be 8mm above it's equilibrium position

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  • $\begingroup$ Please post pictures of your idea. It is extremely difficult for the users to guess what you mean by just giving a brief example. $\endgroup$ Nov 21, 2021 at 18:47
  • $\begingroup$ @RameezUlHaq I have added an example of what I would like the mechanism to do. $\endgroup$
    – Geoffry
    Nov 21, 2021 at 18:53
  • $\begingroup$ you can always put the mechanisms in series and then duplicate them. Again it is probably useless, because it defeats the objective of putting them next to each other. $\endgroup$
    – NMech
    Nov 22, 2021 at 11:44

1 Answer 1


Have three equal diameter hydraulic cylinders connected to a common fluid tank. It, of course is useless, if you expect no interaction between the inputs.


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