In this volume, we will look at a case example of a "double-lever" created by connecting levers utilized in the boost mechanism. The double-lever method not only delivers the boost action in the simple seesaw-type principle but also allows the force direction to be changed.

[Fig.1] - a) illustrates the boost mechanism for the double-lever method. The amplified force (F) is determined by the relationship between the arm length ratio and the equilibrium of forces.

[Fig.1] - b) is a simple fixture (tool) called a "block holder", utilizing the double-lever method. This mechanism is often adopted for tools designed to carry heavy square-shaped items like bricks and blocks.

Although the seesaw-type boost allows the operation of heavy objects with less of force, it is important to remember that the principle of the workload <Workload (Kgm) = Force (Kg) × Movement (m)> always applies. Less amount of force means more movement. If manpower is required for larger strokes or reducing a particular task cycle (such as moving or bending) does not make the entire task inefficient, it is possible to amplify the forces or movement based on this workload principle.

Application examples

1. Workpiece (block) conveyance fixtures
2. Washing and Rinsing clamp
3. Conveyance clamp in heat-treating furnace