Spreading mechanism for an expandable apparatus as well as expandable apparatus

A spreading mechanism for an expandable apparatus including a stanchion and an expandable supporting structure having several pairs of support arms extending apart in a star-shaped manner and support struts hinged to the support arms, said support arms being hinged to a first central fixture and said support struts being hinged to a second central fixture, the spreading mechanism comprising:

• an actuating mechanism;
• and
• a pulley block with a pulley block rope, a fixedly affixed first pulley block roll holder and a movable second pulley block roll holder;
• wherein each of the first pulley block roll holder and the second pulley block roll holder is provided with one or more pulley block rolls through which the pulley block rope is guided,
• wherein the actuating mechanism is connected to the movable second pulley block roll holder of the pulley block and a fast end of the pulley block rope acts in a shifting manner on the first central fixture and/or the second central fixture in order to change their distance to each other, and
• wherein the spreading mechanism is configured to expand or close the expandable supporting structure by reducing or increasing the distance between the first central fixture and the second central fixture.