automatic insertion and extraction guide

automatic insertion device (100, 200, 300, 400), guided by pull-out rails, for a movable component of a furniture, presenting: - one base (101, 201, 301, 401) body, - at least one accumulator energy provided in the body base (101, 201, 301, 401), is which is tensioned when opening the movable member of the cabinet and whose stored energy is usable in the process of closing and insertion aid to final closing position. - a tensioning mechanism for pretensioning of the energy accumulator, which is coupled with the movable element of the cabinet to a predetermined open position, and after exceeding said predetermined open position disengages automatically and locks in position to energy absorber and tensioned, characterized in that the tensioning device has two drivers (109, 113, 207, 208, 305, 306, 405, 406) coupled with at least one energy accumulator, and which block or activate synchronously the tensioning mechanism, which can be guided separately by two respective rails displaceable extraction opposed to each other.