A symmetrical crank-slide mechanism containing a base with a straight guide, two equal length cranks connected to the base with a common hinge placed on the axis of the guide, a slider placed in the guide and a common connecting rod connected to it with a common hinge, the first pair of connecting rods equal in length to each two lengths of the crank and with the midpoints each hingedly connected to the corresponding crank, a second pair of equal along the length of the connecting rods, one ends connected by a common hinge of the first pair of connecting rods and a slider, two equal to each other two along the length of the lever pivotally connected at one end with the corresponding connecting rod of the second pair and the other with a crank located on the other side of the guide axis, two symmetrical equal to each other along the length of the connecting rod of the third pair, pivotally connected at one end to the other end of the corresponding connecting rod from the first pair, two symmetrical equal to each length of the crank of the connecting rod of the fourth pair, pivotally connected by one end to the other end of the corresponding connecting rod from the third pair, two symmetrical equal to each other in length the connecting rod line of the fifth pair, hinged each one end with the other end of the corresponding connecting rod from the fourth pair, the other end rigidly connected each with its own hinge, placed in the common connection hinge of the corresponding crank with the middle of the connecting rod from the first pair, two symmetrical vertical equal lengths cantilever rods, rigidly connected each with a corresponding hinge of the other end of the connecting rod from the fifth pair, two pairs of symmetrical equal to each other along the length of the links connected at the same ends each pair between a hinge, che
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