Stroller, has spring that biases second engaging member downwardly against first engaging member when second engaging member is in engaging position

摘要

A positioning unit (4) has a second engaging member that is movable on a supporting frame (30) of a backrest (3) between engaging and disengaging positions in which the second engaging member respectively engages or disengages from a first engaging member. A spring urges the second engaging member to press downwardly against the first engaging member when in the engaging position.