Safety coupling for fin ray wiper

A windscreen wiper device for a vehicle, comprising a fastening element (50) fixed on a drive shaft (130), and a wiper blade (2) with

• an elongated upper part (10), which is configured at least partially flexibly,
• an elongated lower part (12), which is configured at least partially flexibly,
• a plurality of connecting elements (18) for connecting the upper part (10) and the lower part (12), wherein the connecting elements (18) are spaced apart from one another along a longitudinal extension (8) of the wiper blade (2), and wherein the connecting elements (18) are configured in order to enable a movement of the upper part (10) and the lower part relative to one another with a component of movement along a longitudinal extension (8) of the wiper blade (2),
• a fastening part (30) on a wiper blade side, and
• a coupling device, wherein the fastening part (30) on the wiper blade side and the fastening element (50) are connectable to one another via the coupling device for conjoint rotation until a defined torque value is exceeded, wherein the fastening part (30) and the fastening element (50) are completely released from one another when the defined torque value has been exceeded, wherein the coupling device includes a coupling element (21) and a guide element (210) configured to bear against the coupling element (21) when the defined torque value has not been exceeded, wherein the coupling element (21) is movably mounted on the fastening element (50) and is configured to extend through an opening of the guide element (210) when the defined torque value has not been exceeded, wherein the guide element (210) and the coupling element (21) are arranged such that when the guide element (210) is torqued past the defined torque value relative to the coupling element (21) about an axis that is perpendicular to the longitudinal extension (8) and also perpendicular to a drive axis of the drive shaft (130), the coupling element (21) moves with respect to the fastening element (50) and slips out of the opening of the guide element (210).