Locking mechanism for folding transportation device

A locking mechanism for the folding away of a transportation device. Smooth pin-holes (2) are provided on a hinge-pin (1) and a spring bolt (4) matching said pin-holes (2) is provided on a cylinder (3) enclosing the hinge-pin. The locking mechanism allows for swift and easy locking and release of the hinge-pin (1) and the cylinder (3), enabling locking into a folded position and a deployed position, making possible locking at different levels and different angles, being also highly automatic and structurally simple.