Inclination adjustment lock for seat backs

An inclination adjustment lock for seat backs (9) comprising:

• a first lock part (2) and a second lock part (4), one of which (2) is firmly attached to the first partial area (9a) and the other of which (4) is attached to the second partial area (9b), whereby both partial areas (9a, 9b) are connected together so that they may pivot about a common pivot axis (3), and the second (4) is mounted to the second partial area (9b) so that it may pivot about an axis (4a) parallel to the pivot axis (3) and so that it may be held via a locking pawl (5) in a ratchet position in which a toothed section (4b) of the second lock part (4) engages with an opposing toothed section (2a) of the first lock part (2), wherein pressure angles (α, γ) of the tooth faces receiving increased loading conditions that are greater than at rest loading conditions decrease to the toothed section (4b) of the second lock part (4) and on a complementary opposing toothed section (2a) as the separation from the axis (4a) increases.