Mechanical security device for elevators used between two levels

An elevator which operates between a lower level and an upper level, comprising a cabin (1) closed by a swinging door (2) which opens to the exterior, said cabin (1) moving by translational vertical motion from a lower level up to a booth (3), situated at an upper level and comprising a guard rail (4) closed by a swinging landing door (5) which is normally locked, opening toward the exterior of the cabin (1) by means of an articulation situated on the same side as door (2) of said cabin (1) , characterized in that it is provided with means allowing to:

• automatically unlock the door (2) of the cabin (1) when said cabin (1) arrives at the right place on the upper or lower level,
• block the cabin (1) at the upper level until the door (2) to said cabin (1) has been properly closed,
• block the cabin (1) at the lower level until the door (2) to said cabin (1) has been manually closed and locked,
• lock the door (2) of the cabin (1) between the upper and lower levels,
• automatically join in rotation around their respective articulations the door (2) to the cabin (1) and the landing door (5) when said cabin (1) reaches the upper level,
• automatically disconnect the door (2) to the cabin (1) and the landing door (5) when said cabin (1) leaves the upper level,
• automatically unlock, upon upward movement of the cabin (1), the landing door (5) when said cabin (1) reaches the upper level,
• upon downward movement of the cabin (1) leaving the upper level, automatically completely close the landing door (5) and the door (2) of said cabin (1), and simultaneously lock said doors (2, 5), the swinging door (2) having been previously sufficiently closed to allow the cabin (1) to descend,
• said means all being passive and entirely mechanical.