Acute-Angle Keder Track for Wiper Torsional Rigidity

The patent applies asymmetry by configuring the piping rail with vertical walls and horizontal walls that form acute angles (less than 85°, preferably less than 80°) rather than conventional right angles. This asymmetric angular configuration increases torsional rigidity while maintaining structural simplicity, directly resolving the contradiction between strength improvement and complexity avoidance.

The patent introduces an intermediate wall with surfaces extending parallel to horizontal walls, creating additional contact surfaces in a new spatial dimension. This allows the wiper strip to engage with multiple surfaces (vertical walls, horizontal walls, and intermediate wall surfaces) simultaneously, enlarging the effective contact surface area without proportionally increasing the overall holding unit volume, thus resolving the contradiction between reliability improvement and volume control.

The patent merges the wind deflector element with the holding unit by having the wind deflector rest laterally on the holding unit in the area of the longitudinal guide channel, creating a jointless integrated structure in the main flow area. This eliminates joints that would generate noise and flow resistance, while the extrusion process maintains ease of manufacture by producing the wind deflector as a continuous piece, thus resolving the contradiction between harmful factor reduction and manufacturing ease.

The patent changes the geometric parameters of the wind deflector element by giving it a triangular cross-section instead of conventional shapes. This parameter change allows the use of extrusion manufacturing processes that are more cost-effective, while the triangular geometry inherently provides high strength-to-weight ratio, thus resolving the contradiction between strength maintenance and production cost reduction.