Convertible Top Linkage Stiffness via Fixed Pivot Hinges

The patent removes the elongated holes and slot guides from the linkage system, replacing them with fixed pivot connections. This extraction of the flexible connecting elements eliminates the compromise between displacing capability and stiffness, as the fixed pivots provide rigid connections while still allowing the necessary rotational motion for the folding mechanism to operate.

Instead of using flexible connections (elongated holes and slot guides) to achieve displacement, the patent inverts the approach by using rigid fixed pivot connections that allow rotation. The displacement capability is achieved through the rotational degrees of freedom of the pivots rather than through translational flexibility of elongated holes, thereby maintaining stiffness while preserving the necessary motion capability.

The patent inverts the connection methodology by replacing flexible slot-and-guide arrangements with rigid fixed pivot connections. The necessary adaptability for roof frame element displacement is achieved through the rotational freedom of the pivots in the four-arm hinge mechanisms, while the rigid pivot connections eliminate the destabilizing degrees of freedom that would otherwise be introduced by elongated holes and slot guides.

The linkage system is segmented into distinct four-arm hinge mechanisms with fixed pivot connections at each joint. This segmentation allows each hinge mechanism to independently manage the degrees of freedom, providing controlled rotational motion while maintaining overall system stability. The fixed pivots at each segmentation point prevent the accumulation of destabilizing degrees of freedom that would occur with continuous flexible connections.