System for a wiper arm and a wiper arm

A system for a wiper arm, wherein the system comprises an attachment, wherein the attachment comprises a snap-in means and a channel, wherein the system further comprises a wiper rod, wherein the wiper rod comprises a snap-in means which is complementary to the snap-in means of the attachment, wherein the snap-in means of the attachment is a spring element and the snap-in means of the wiper rod is a recess, wherein the system is configured such that the wiper rod can be inserted into the channel and then slid along a longitudinal axis of the channel in a direction so far, until the spring element and the recess interlock, thereby preventing or limiting movement of the wiper rod within the channel and thus fixing the attachment to the wiper rod, wherein the system is configured such that the interlock of the spring element and the recess is enforced, when the wiper rod is pressed in an opposite direction, thereby pressing a second part of the recess against a first part of the spring element, wherein the first part of the spring element is an inclined surface, wherein an inclination of the inclined surface of the first part of the spring element is such that a width of the spring element increases as a distance of the spring element to a longitudinal axis decreases, wherein the width of the spring element is defined along an axis parallel to the longitudinal axis of the channel when the spring element and the recess are interlocked and/or wherein a second part of the spring element is an inclined surface, wherein an inclination of the inclined surface of the second part of the spring element is such that the width of the spring element increases as the distance of the spring element to the longitudinal axis decreases, wherein a force is caused by contact of the inclined surface of the first part of the spring element with the respective second part of the recess of the wiper rod, wherein the inclination of the inclined surface of the first part of the spring element divides the contact force in force components acting in perpendicular directions, wherein at least one force component is directed such that it presses the spring element more into the recess, wherein the first part of the spring element is substantially parallel to the second part of the recess.