Coupling mechanism for a drive train of a hair cutting appliance

Abstract

The present invention relates to a drive train () of a hair cutting appliance () and to a self-aligning coupling linkage () for a drive train (). The coupling linkage () comprises a driving shaft and a non-aligning output shaft (), said coupling linkage () comprising: a first driving coupling element () arranged to be driven by a driving shaft (), particularly by a motor shaft, a transmission shaft (), particularly a rigid transmission shaft (), comprising a first drivable coupling element () at a first end and a second driving coupling element () at a second end thereof, wherein first driving coupling element () engages the first drivable coupling element () for rotatingly driving the transmission shaft (), thereby forming a first pivoting joint (), wherein the second driving coupling element () is arranged to engage a second drivable coupling element () of an output shaft (), wherein the first driving coupling element () and the first drivable coupling element () define a male connector comprising an external polygonal profile (), viewed in a cross-sectional plane perpendicular to a longitudinal axis, and a female connector comprising an internal polygonal profile (), and wherein the external polygonal profile () of the male connector, viewed in a longitudinal axial section, is at least sectionally provided with convexly shaped flanks ().