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Figure 1 Toggle Mechanism

Eq. 1
Q = [ P · ( l + l₁ / l₁ ) + q ] · (l₂ / l₃ ) · ( 1 / n)

Eq. 2
Q = Q_o ( l₂ / l₃ ) ( 1 / n )

Eq. 3
Q_o = P ( ( l + l₁ ) / l₁ ) + q 

Where:

Q = force applied to handle. lbf, (N)
Q_o = force applied lbf, (N)
P = clamping force, lbf. (N)
q = spring resistance, lbf. (N)
n = efficiency coefficient, 0.98 to 0.84
l, l₁, l₂, l₃ = length as indicated. in, (mm)

Reference:

Handbook of Machining and Metalworking Calculations
Ron A. Walsh
2001

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