FIELD: construction.
SUBSTANCE: movable staircase comprises double metal, parallel and pairwise arranged and hingedly fixed open strings, forming two parallelograms, to which steps, railing stands and handrails are hingedly fixed. The staircase may vary its geometry, during vertical displacement of a mooring pontoon relative to a static pier, besides, all elements of the staircase may move in parallel to each other - steps will always be parallel to the horizontal upper site of the pier, and the handrails will always be parallel to double open strings.
EFFECT: increased safety of people passing from the static pier on shore to a moorage or a pontoon floating on waves.
3 cl, 1 dwg
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