PCT No. PCT/IT89/00075 Sec. 371 Date Jul. 3, 1991 Sec. 102(e) Date Jul. 3, 1991 PCT Filed Nov. 13, 1989 PCT Pub. No. WO90/05862 PCT Pub. Date May 31, 1990.A crank mechanism for the transformation of a rotary movement of a crank supported in a crankcase into reciprocating movement of a piston in a cylinder, includes an open kinematic chain composed of three pivotally connected rods with the ends of the chain being pivotally connected to the crankcase. The piston is connected to one of the intermediate pivotal connections of the three rods by another rod and a crank pin of the crank mechanism is connected to the other intermediate pivotal connection of the three rods by still another rod. Four dead centers can be obtained with the crank mechanism.
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