A device for reducing a dimension to the thickness of its size and folding it to reduce its height by half and to reduce its thickness to a thickness equal to four dimensions supplemented by its transport systemUse the U-groove shape on the vehicle channel. The system is integrated between the amounts to maintain a rod so that the ladder does not slide or retract. The ladder consists of two U-shaped and square cross-section bars.A deformed montanson reversible element in which a rectangular or circular bar connected to a column by a bar rivet or bolt is inserted into the u-cavity: in this case, the column is a square part of a rectangle or a circle, and the reinforcement is connected to the column by rivets or bolts. One of the amounts is contained in the lawyer's u-chamber
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