Patent ID: 6895812

Claim:
A cup anemometer with at least two cups ( 1 ) each attached to an arm ( 2 ) of a hub ( 3 ) on a rotary shaft, cup relating to a generally seen cup-shaped body having a concave inner surface ( 6 ) and a convex outer surface ( 7 ) which meet at the opening of the cup, the opening of the cups being directed essentially along the tangent to the rotational path of the cups, characterised in that the cups are truncated at their opening by means of three cuts ( 14 , 15 , 16 ) which are essentially located in three planes that are parallel with the tangent of the rotational path of the cups at the opening and that, projected on a fourth plane ( 9 ) having the tangent as normal, essentially form a triangle, and that each cup is attached to its arm ( 2 ) at one of the three corners ( 10 ).