Telescopic guide system for sliding steps

A boarding device comprising a shiftably arranged sliding step, having a step plate and a slide-out unit operatively connected to the step plate,

• wherein the slide-out unit is embodied to be variable in length in the slide-out direction of the step plate,
• wherein the slide-out device comprises a front first linear element in the slide-out direction and of a rear second linear element in the slide-out direction, wherein the two linear elements are connected to one another via a linear element connection and are arranged essentially next to one another,
• wherein the linear element connection of the two linear elements to one another is formed by at least one elongated hole and a guide roller displaceably mounted therein, wherein the elongated hole is arranged in one of the linear elements and the guide roller is arranged on the other linear element and a longitudinal axis of the elongated hole extends in the slide-out direction,
• wherein one of the linear elements is mounted on a first roller arranged on the vehicle in a stationary manner and is configured to be displaced thereon,
• wherein a second roller is arranged on the linear element itself and rolls on a guideway, which is arranged on the boarding device and which extends in the slide-out direction,
• wherein the first roller arranged in a stationary manner is arranged on a base frame, into which the step plate is configured to be retracted and extended,
• wherein the slide-out unit is arranged such that a roller spacing A between the first roller and the second roller is configured to be increased by displacing the rear second linear element, which supports the second roller, in the extension direction.