Blade set and hair cutting appliance

A stationary blade for a blade set of a hair cutting appliance, said blade set being arranged to be moved through hair in a moving direction to cut hair, said blade comprising

• a first wall portion arranged to serve as a skin facing wall portion during operation, the first wall portion extending in a substantially flat manner,
• a second wall portion, each of the first and the second wall portion defining
• a first surface, and
• a second surface facing away from the first surface, and
• an intermediate wall portion arranged between the first and the second wall portion,
• wherein the first wall portion the second wall portion and the intermediate wall portion jointly define at least one toothed leading edge comprising a plurality of mutually spaced apart projections provided with respective tips,
• wherein the toothed leading edge at least partially extends in a transverse direction (Y, t) relative to the moving direction assumed during operation, wherein the mutually spaced apart projections at least partially extend forwardly in a longitudinal direction (X, r) approximately perpendicular to the transverse direction (Y, t),
• wherein the first surfaces of the first wall portion and the second wall portion face each other, at least at their leading edges,
• wherein facing projections along the leading edges of the first wall portion, the second wall portion and the intermediate wall portion are interconnected at their tips to define a plurality of teeth,
• wherein the first surfaces of the first wall portion and the second wall portion define therebetween a guide slot for a movable blade of said blade set,
• wherein the first wall portion, the second wall portion and the intermediate wall portion comprise an overall height extension (to),
• wherein the overall height extension (to) of the first wall portion, the second wall portion and the intermediate wall portion, at least at the at least one leading edge, is in the range of about 0.3 mm to about 0.75 mm, preferably in the range of about 0.4 mm to 0.5 mm, and
• wherein a ratio between the height extension (t2) of the second wall portion and the height extension (t1) of the first wall portion is in the range of about 1.2:1 to 3.0:1.