Help needed please - Toggle mechanism force calculations

Hi,

I've searched everywhere trying to work out how to calculate the spreading force of a simple toggle mechanism. I have a two equal length arms that are hinged together. One end is fixed on a pivot pin and the other can slide along a flat plane but is resisted by a fixed stop. The hinged arms are not quite in line and aligning them would increase their overall length. If I apply a force to the hinge, perpendicular to the base plane, what force along the plane will I get?Is there an equation I can use? I don't need to consider friction in the pins or sliding surfaces just now.

Help!

Toggle mechanism force calculation.

Dear jboggs,

Would u please elaborate [B]"the horizontal force is analogous to the 94mm dimension, which means the horizontal force is 94/34 x 50N = 138N" [/B] the highlighted sentence. let me know on what basis was the calculation done :mad2:

[QUOTE=jboggs;7724]turtlefish,

Actually there is an error in your logic. The 100N downward force is just that - downward. Because the two links are equally offset from the vertical, each links absorbs equal shares of it, 50N each. That is a vertical force. In your second diagram it is analogous to the 34mm dimension. Which means that the horizontal force is analogous to the 94mm dimension, which means the horizontal force is 94/34 x 50N = 138N. So the horizontal force does exceed the vertical applied force.[/QUOTE]