Patent ID: 9637089
Date: 2017-05-02
CPC Classifications: B60S

Claim:
1. A windshield wiper system for rotary wing aircrafts with a windshield having a curved surface and an oscillating gear drive with a central park position, the system comprising: two wiper arms and wiper blades with lips, the wiper blades being mounted by means of the wiper arms to the oscillating gear drive for oscillation across the windshield about an oscillatory axis, the windshield and the wiper blade lips have a frictional coefficient (μ) therebetween, the wiper blades being mounted to the at least one wiper arm distal to oscillatory axis and defining in the central park position a longitudinal axis along the curved surface of the windshield, and the at least one wiper arm in the central park position being aligned with the longitudinal axis; wherein the two wiper blades each with a wiper blade fit bolt, bearing bushes, a prolongation fitting and a rocker are provided, the two wiper blades being mounted rotatable about a wiper blade rotation axis, perpendicular to the oscillatory axis and the longitudinal axis, the wiper blade rotation axis, being defined by a center line through the wiper blade fit bolts mounted opposed to each other on the two wiper blades being essentially parallel with a distance (a) to each other, the rocker rotatable attaching each of the two wiper blades by means of a respective one of the wiper blade fit bolts, and the prolongation fitting rotatable attaching the rocker to the wiper arms, a rocker fit bolt defining a rocker rotation axis in a plane defined by the oscillatory axis and the longitudinal axis with an inclination angle β to the outer surface of the windshield in the central park position providing a distance (b) direct under the wiper blades rotation axis between the windshield and the rocker rotation axis perpendicular to the windshield in the central park position fulfilling