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In this paper, we consider special ruled surfaces associate d to the involute curve α ∗ and Bertrand mate α ∗∗ of a curve α. They are called as Involutive Darboux Frenet ruled surfaceand Bertrandian Darboux Frenet ruled surface , cause of their generators are the Darboux vector fields of involute curve α ∗ and Bertrand mate α ∗∗ . We give the parametric equations of striction curves along these Frenet ruled surfaces in terms of the Frenet apparatus of curve α. Further some results are given based on the tangent vector fi elds of these striction curves along Involutive and Bertrand Darboux ruled surfaces in E 3 .

On the striction curves along the involutive and Bertrandian Darboux ruled surfaces based on the tangent vector fields