Link 1 turns about fixed axis A. Switching lever 3 turns about fixed axis B. Link 1 and lever 3 have profiled cam surfaces a and b. Steel band 2 runs over surfaces a and b and is attached at its ends C and D to link 1 and lever 3. When lever 3 is turned about axis B, link 1 turns about axis A. Lever 3 is returned to its initial position by spring 4.
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