Tilting device for combination with seat cushion frame and backrest frame, has lever testing aid which helps a user to detect and control dislocation of lever from reference point

摘要

Tilting device has lever testing aid provided between lever element (1) and seat cushion frame of backrest frame. Lever testing aid helps a user to detect and control a dislocation of lever from reference point. The user is able to easily determine the meshing of the outer toothed section (31A) of the locking toothed wheel is meshed with the inner toothed section (40B) of the toothed wheel plate (40).