Swivel-assistance to a roof-skin holding bow forming the lower end of a folding canopy

Swivel-assistance to a roof-skin holding bow forming a lower end of a folding canopy having canopy support struts of a main hoop, comprising:

• lateral limbs of the roof-skin holding bow which each end with a bent lever;
• an angle lever arranged adjacent to each of the bent levers of the lateral limbs and having a same shape as the associated bent lever, one end of each of the angle levers being connected to an associated lateral limb by a rotary/sliding connection and an other end of each of the angle levers being pivotally mounted on an associated canopy strut at a bearing pin;
• a rod element, having an alterable length, for affixing each of the lateral limbs of the holding bow to an associated canopy strut of the main hoop, each of the rod elements being articulated at both ends and arranged in a side wall region of the folding canopy, a first end of each of the rod elements being connected to an associated lateral limb of the roof-skin holding bow, and a second end of each of the rod elements being connected in articulated fashion to the associated canopy strut;
• and
• an arm for articulation of the each of the rod elements on the roof-skin holding bow, one end of each of the arms being rigidly connected to an associated angle lever at the bearing point and another end of the each of the arms being pivotally connected to the first end of the associated rod element;
• whereby articulation points of the rod element on the canopy strut and at the second lever of the roof-skin holding bow are arranged in such a way with respect to one another that, when the roof-skin holding bow is raised, a line of action of a spring force extending along a central longitudinal axis of the rod element runs behind the bearing pin and that, following a completion of a first phase of a return swivelling movement of the roof-skin holding bow, the line of action of the spring force runs in front of the bearing pin.