Patent ID: 8876212

Claim:
A seat adjustment apparatus for a vehicle, comprising: a first bracket integrally including a ratchet inner teeth portion, a bracket side reverse wall portion, and a bracket side return wall portion; a second bracket pivotally supported by the first bracket to define an accommodating void with the first bracket, the second bracket adjusting a posture of a seat for a vehicle by rotating relative to the first bracket; a holding member inhibiting the first bracket and the second bracket from moving in a rotational axial direction of the second bracket; a pawl supported by the second bracket within the accommodating void and being pivotable about an axis in parallel with the rotational axial direction of the second bracket; and a pawl reverse spring including a first end portion engaging with the second bracket and a second end portion engaging with the pawl within the accommodating void, the pawl integrally including a ratchet portion, a pawl side reverse wall portion, and a pawl side return wall portion, the ratchet portion allowing a relative rotation of the first bracket and the second bracket in a first direction and prohibiting a relative rotation of the first bracket and the second bracket in a second direction opposite from the first direction by engaging with the ratchet inner teeth portion in a case where the pawl is biased to rotate in a normal direction by the pawl reverse spring, the pawl side reverse wall portion allowing the relative rotation of the first bracket and the second bracket in the second direction by making contact with the bracket side reverse wall portion in a case of the relative rotation of the first bracket and the second bracket in the first direction so that the pawl is reversed by being biased to rotate in a reverse direction by the pawl reverse spring, the pawl side return wall portion bringing the pawl to be returned by being biased to rotate in the normal direction by the pawl reverse spring by making contact with the bracket side return wall portion in a case of the relative rotation of the first bracket and the second bracket in the second direction, wherein plural pairs are arranged within the accommodating void so as to be rotationally symmetric, one pair of the plural pairs including the pawl and the pawl reverse spring, and wherein the first bracket includes an idle wall portion allowing the relative rotation of the first bracket and the second bracket by the ratchet portion sliding on the idle wall portion before the pawl is reversed in a case where the pawl is biased to rotate in the normal direction by the pawl reverse spring, a reverse engagement projection formed to project at the idle wall portion and a reverse engagement recess portion formed to be dented at the pawl and to which the reverse engagement projection is fitted in a case where the pawl is reversed.