How to Design a 4 Bar Linkage Claw for Underwater Use?

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ezioldschool
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Hello All,

I am working on a final project for class, and I am trying to design a bar linkage claw design like the one I have attached. I have also attached my attempt to design the length, and where the base pins are supposed to go for the desired start and finish position, open and closed, of the claw. I want to make sure I am approaching this the right way. The claw will be holding a submarine. I have also attached my approach to calculating the dynamic forces that the links and pins of the claw will experience while traveling under water. I realize that I am missing key things like length and angles; this is just a start I want to make sure I am approaching it the right way. Any help or comments that might help me will be greatly appreciated. If there is literature that will help that would also be greatly appreciated.

Thank You
 
Attachments
  • CAD render of a gripper with two pairs of linked arms driven by meshing gears, shown in an open position with a small motor mounted at the top.
    4 bar linkage claw.jpg
    22.6 KB · Views: 2,789
  • Hand-drawn 4-bar linkage sketch titled "The Latch" with two configurations: "open" in black and "closed" in red, with dashed construction lines and labelled pivots O2, O4, A and B.
    design attempt.jpg
    23.1 KB · Views: 1,000
  • Hand-drawn free-body diagram of a four-bar linkage claw, with labelled forces F_A to F_E on the links and pins, a drag force arrow, and a sketch of the open and closed claw positions.
    Force analysis.jpg
    27.3 KB · Views: 1,378