Link 5, oscillating about fixed axis A, has slots a and b along which pins c and d slide. Pins c and d are rigidly secured to piston rods 2, 3 and 4. When crank 1 rotates about fixed axis B, piston rod 2 reciprocates. Slotted link 5 oscillates about axis A and thereby reciprocates piston rods 3 and 4. If link 5 has equal arms, the strokes of piston rods 2, 3 and 4 will be equal.
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