Vehicle Flap Linkage for Low-Force Secure End Positioning

The patent applies a dynamic multi-joint mechanism that automatically adapts its mechanical advantage ratio throughout the flap's range of motion. The mechanism transitions from a first mechanical advantage ratio during initial movement to a second mechanical advantage ratio near end positions, providing high securing force exactly when needed while requiring low force during most of the travel. This dynamic adaptation resolves the contradiction between low operating force and high securing force in end positions.

The mechanism changes its mechanical advantage parameter continuously as the flap moves between open and closed positions. By varying the mechanical advantage ratio as a function of position, the system achieves low force requirements during traversal while providing high securing forces at end positions, directly resolving the force-security contradiction.

The dynamic multi-joint mechanism provides inherent stability at end positions through its varying mechanical advantage characteristics, eliminating the need for additional complex locking mechanisms. The mechanism naturally resists unwanted movements at end positions due to its mechanical properties, achieving high positioning stability with relatively simple structure.

The mechanism serves itself by using its own dynamic mechanical advantage characteristics to provide securing force and prevent unwanted movements. No separate complex securing mechanism is needed - the multi-joint mechanism inherently provides both movement control and positioning stability throughout its range of motion.