Rockett, Frank H. Engineering Consultant, Charlottesville, Virginia.
- Additional Readings
Any of a wide variety of mechanisms, many used to open or close electrical contacts abruptly and all characterized by the control of a large force by a small one. The basic action of a toggle mechanism is shown in illus. a. When α = 90°, forces P and Q are independent of each other. Again, when α = 0° the forces are isolated, force Q being sustained entirely by the frame, and force P serving only to hold the link in position. At α = 45° from the symmetry |P| = |Q|, the mechanism serves to transfer the direction of forces to achieve equilibrium. If frame, connecting rod, and slider blocks with their pivots are sufficiently strong to support the maximum force encountered and if the coefficients of friction at the pin and slider joints are negligible, at intermediate positions the forces are related by the equation below.
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