Linkage unit and hair cutting appliance

A hair cutting appliance includes a linkage unit configured to couple a cutting unit and to a housing of the hair cutting appliance. The linkage unit includes a four-bar linkage mechanism having first and second arms which respectively include first and second bases pivots coupled to a base. The first and second base pivots are arranged at the base at a fixed distance. The first arm and second arms also respectively include first and second top pivots coupled to a connecting bar. The connecting bar is configured to be coupled to the cutting unit such that, during operation, the cutting unit is pivotably supported by the four-bar linkage mechanism.