The present invention relates to a control friction device including a first element and a second element mounted to move relative to each other in the sliding direction. The present invention, said device comprises a first and second friction members 5, 5 rub symmetrically arrayed selectively the second element between the two elements, each of the friction member by the presser member 6 characterized in that it is pushed toward the wedging position. The first friction member, first by presser member has a tendency to prevent relative movement between the two elements in a first direction of relative movement between the two elements along the stroke direction and in a second direction the opposing frictional force corresponding to the stress applied to the wedge members are arranged to have a tendency to make the two elements. The second friction member, two elements relative movement has a tendency to prevent and counter frictional force corresponding to the stress applied to the second wedge member by the presser member in a first direction of the two elements in the second direction It is arranged to have a tendency to be added to. The apparatus further either direction component of the relative movement to invalidate the one of the friction members suitable for blocking, but nullifying means and the other friction member does not interfere with the addition of opposing frictional force 10, equipped with a 13 and 14.
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