Abstract: A hinge arm adapted to be attached to a vehicular seat back is pivotally connected to a bracket adapted to be attached to the seat cushion and normally is held in a fixed position by virtue of a pivoted latch on the arm engaging a fixed latch plate on the bracket. The latch and the latch plate are formed with engageable latching faces which cause a heel on the latch to wedge into a pocket in the latch plate and prevent chucking of the seat back. The latching faces are curved on different radii and about different centers in order to maintain tight engagement between the two latching faces and to keep the heel wedged into the pocket as the latching faces wear.