Vehicle Door Handle Shaft Section Backlash Prevention

The patent applies local quality by creating a groove portion at a specific location on the shaft section where it contacts the frame. This groove is positioned at the end of the shaft section that contacts the frame, creating a localized feature that prevents backlash while maintaining overall rotational freedom. The groove engages with a corresponding groove engaging portion on the frame, providing precise local contact that eliminates the harmful gap without restricting the pivot motion.

The groove portion acts as an intermediary element between the shaft section and the frame. Instead of direct contact between the cylindrical shaft and the supporting hole, the groove portion mediates the interaction by engaging with the groove engaging portion on the frame. This intermediary feature ensures precise positioning and eliminates backlash while allowing the link to pivot freely, thus resolving the contradiction between free rotation and backlash prevention.

The groove portion creates a localized constraint at the critical contact point between the shaft section and the frame. This local feature prevents movement in unwanted directions while maintaining the simple insertion assembly process. The groove is positioned specifically at the end of the shaft section that contacts the frame, providing directional stability without complicating the overall assembly procedure.

The groove portion adds a dimensional constraint by creating a recessed feature that engages with the groove engaging portion on the frame. This transforms the simple cylindrical contact into a more complex geometric interaction that prevents unwanted movement in radial directions while maintaining freedom of rotation around the pivot axis. The groove extends in the rotation axis direction, creating a constraint in a different dimension than the simple radial contact would provide.