Rotation of bevel gear 5 is transmitted to bevel gears 3 and 4 which rotate at equal angular velocities in opposite directions. At this, the centre of shuttle 2, which turns about rod 1 and is connected to gears 3 and 4 by ball-and-socket joints a, reciprocates together with rod 1. The driving link may also be rod 1 whose reciprocation is converted into rotation. Flywheels 6 and 7 enable the mechanism to pass through its extreme points (dead centres).
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